"use strict";

const api = window.chjPlugin;
const i18n = window.chjPluginI18n.createI18n("cs");
const t = i18n.t;
let endedSessionId = "";
let sessionsLoading = false;

// Guard every continuation, including sudo retries and dialog answers, against a server switch.
async function sessionResult(promise, token) {
  const value = await promise;
  if (token !== state.generation) {
    if (value?.editId) void api.files.closeText(value.editId).catch(() => {});
    throw new Error("CHJ_SESSION_CHANGED");
  }
  return value;
}

// Marks a catalog key that is translated with t() only when it is shown.
const k = (text) => text;
const byId = (id) => document.getElementById(id);
const elements = Object.fromEntries([
  "pluginVersion", "closeButton", "sessionSelect", "refreshSessionsButton", "rootButton", "upButton", "refreshButton", "breadcrumbs", "pathForm", "pathInput",
  "newFileButton", "mkdirButton", "uploadButton", "downloadButton", "zipButton", "tarGzButton", "tarButton", "filterInput", "selectAllCheckbox", "filesBody",
  "busyOverlay", "busyLabel", "status", "selectionInfo", "editor", "editorPath", "editorTarget", "editorPrivilege", "editorBackup", "editorLanguage", "editorSize", "editorDirty", "editorHost", "editorPosition",
  "downloadEditorButton", "saveEditorButton", "closeEditorButton", "contextMenu",
  "transfers", "transfersToggle", "transferSummary", "transferOverall", "transferOverallText", "transferList", "pauseAllButton", "resumeAllButton", "cancelAllButton",
  "pauseSelectedButton", "resumeSelectedButton", "cancelSelectedButton", "clearFinishedButton", "concurrencySelect", "autoRetryCheckbox", "verifyCheckbox",
  "sudoDialog", "sudoReason", "sudoError", "sudoPasswordRow", "sudoAccount", "sudoPassword", "sudoRemember", "sudoConfirm",
  "planDialog", "planTitle", "planSummary", "planConflicts", "planConflictText", "planConflictList", "planSkipped", "planSudo", "planPasswordRow", "planPassword", "planRemember", "planError", "planSkip", "planOverwrite", "planStart"
].map((id) => [id, byId(id)]));

const state = {
  generation: 0, sessionId: "", sessions: [], currentPath: "/", entries: [], visibleEntries: [], selected: new Set(), anchorPath: null, listPrivileged: false,
  sortKey: "name", sortDirection: 1, busy: false, monaco: null, editor: null, editorPath: null, savedText: "", monacoPromise: null,
  edit: null, sudoAccepted: new Set(), transfers: new Map(), transferSessionNames: new Map(), transferSummary: null, transferSelected: new Set(), transferNodes: new Map(), renderQueued: false
};

window.MonacoEnvironment = { getWorkerUrl: () => "vendor/monaco/vs/base/worker/workerMain.js" };

// Server error codes → concrete, user-facing reasons (the backend keeps stable codes).
const ERROR_TEXT = {
  FILE_PERMISSION_DENIED: k("Účet SSH nemá k této operaci oprávnění souborového systému."),
  FILE_METADATA_PERMISSION: k("Původního vlastníka, skupinu nebo atributy souboru nelze bez oprávnění správce zachovat."),
  FILE_NOT_FOUND: k("Soubor nebo adresář neexistuje."),
  FILE_EXISTS: k("Cílová položka již existuje."),
  FILE_CONFLICT: k("Soubor byl mezitím změněn jiným procesem (obsah, práva nebo cíl odkazu). Uložení bylo zastaveno, původní soubor zůstal beze změny."),
  FILE_HARDLINK_UNSUPPORTED: k("Soubor má více pevných odkazů (hardlink). Nahrazení novým inode by přerušilo sdílení obsahu s ostatními odkazy, proto se automaticky neprovádí."),
  FILE_UNSAFE_TYPE_OR_LINK: k("Cíl není běžný soubor (např. zařízení, FIFO nebo nečekaný odkaz)."),
  FILE_UNSAFE_PATH: k("Cesta obsahuje nebezpečnou nebo neplatnou součást (např. smyčku symbolických odkazů)."),
  FILE_SYMLINK_TARGET_MISSING: k("Symbolický odkaz vede na neexistující cíl."),
  FILE_SYMLINK_LOOP: k("Symbolické odkazy tvoří smyčku."),
  FILE_UNSAFE_PRIVILEGED_DIRECTORY: k("Některý nadřazený adresář je zapisovatelný pro všechny bez sticky bitu; privilegovaná operace byla odmítnuta."),
  FILE_UNSAFE_WORKSPACE: k("Soukromý pracovní adresář účtu není bezpečný (vlastník/práva). Zkontrolujte domovský adresář."),
  FILE_METADATA_UNSUPPORTED: k("Důležitá metadata (ACL, xattr, SELinux, IMA/EVM) nelze bezpečně převzít. Operace byla zastavena."),
  FILE_NO_SPACE: k("Na cílovém souborovém systému není dost místa. Původní soubor zůstal nedotčen."),
  FILE_READ_ONLY_FILESYSTEM: k("Souborový systém je připojen jen pro čtení."),
  FILE_TOO_LARGE: k("Soubor překračuje limit editoru 25 MiB."),
  FILE_DEPENDENCY_UNAVAILABLE: k("Na serveru chybí python3, který je nutný pro bezpečné uložení se zachováním metadat."),
  FILE_LINUX_REQUIRED: k("Bezpečné ukládání je podporováno jen na linuxových serverech."),
  FEATURE_PLATFORM_UNSUPPORTED: k("Na tomto serveru (Windows) není editor ani privilegovaná správa souborů k dispozici; přenosy nových souborů a stahování fungují přes SFTP."),
  FILE_RESULT_UNKNOWN: k("Výsledek operace nelze potvrdit (např. přerušené spojení). Obsah editoru zůstal zachován a na serveru je obnovitelná kopie."),
  FILE_UPLOAD_TIMEOUT: k("Nahrání pracovní kopie vypršelo."),
  FILE_PROTECTED_PATH: k("Systémový adresář nelze odstranit ani přejmenovat."),
  FILE_DIRECTORY_NOT_EMPTY: k("Adresář není prázdný."),
  FILE_BUSY: k("Soubor je právě používán."),
  FILE_VERIFY_FAILED: k("Kontrolní součet přenesených dat nesouhlasí se zdrojem."),
  FILE_SOURCE_CHANGED: k("Zdrojový soubor se během přenosu změnil. Spusťte přenos znovu od začátku."),
  FILE_RESUME_MISMATCH: k("Uložená část souboru neodpovídá zdroji, nelze bezpečně navázat. Spusťte přenos znovu od začátku."),
  SUDO_PASSWORD_REQUIRED: k("Operace vyžaduje heslo sudo."),
  SUDO_PASSWORD_INCORRECT: k("Heslo sudo bylo odmítnuto."),
  SUDO_NOT_PERMITTED: k("Účet nemá oprávnění používat sudo pro tuto operaci."),
  SUDO_TTY_REQUIRED: k("Politika sudo vyžaduje terminál (requiretty); CH-J ji neobchází."),
  SUDO_AUTH_FAILED: k("Ověření sudo selhalo nebo je účet uzamčen."),
  SUDO_UNAVAILABLE: k("Na serveru není sudo a účet není root."),
  SESSION_NOT_CONNECTED: k("SSH relace není připojena."),
  TRANSFER_STALLED: k("Po dobu 60 s nebyla potvrzena žádná data (timeout)."),
  APP_RESTARTED: k("Aplikace byla během přenosu ukončena."),
  LOCAL_NO_SPACE: k("Na lokálním disku není dost místa."),
  TRANSFER_HOST_KEY_CHANGED: k("SSH klíč serveru se od začátku přenosu změnil, může jít o jiný stroj. Pokud je to stejný server, spusťte nový přenos."),
  TRANSFER_SAME_PATH: k("Zdroj a cíl jsou stejná složka."),
  TRANSFER_INTO_ITSELF: k("Složku nelze kopírovat do ní samotné."),
  TRANSFER_INVALID_SELECTION: k("Vyberte položky ke kopírování a dva různé panely."),
  LOCAL_PERMISSION_DENIED: k("K této lokální položce nemáte oprávnění."),
  LOCAL_OPERATION_FAILED: k("Lokální operace selhala."),
  TRANSFER_PLAN_SERVER_CHANGED: k("Výběr vypršel, vyberte soubory znovu."),
  TRANSFER_PLAN_EXPIRED: k("Výběr vypršel, vyberte soubory znovu.")
};
const MOVE_KEPT_TEXT = { unverified: k("kontrolní součet nebyl potvrzen"), "source-changed": k("zdroj se mezitím změnil"), "source-gone": k("zdroj už neexistuje"), "source-disconnected": k("zdrojová relace není připojena"), "remove-failed": k("zdroj nelze odstranit") };
const NEEDS_SUDO = new Set(["FILE_PERMISSION_DENIED", "FILE_METADATA_PERMISSION", "SUDO_PASSWORD_REQUIRED"]);
const STATE_TEXT = { waiting: k("Čeká ve frontě"), connecting: k("Připojování"), transferring: k("Přenos probíhá"), paused: k("Pozastaveno"), interrupted: k("Přerušeno"),
  reconnecting: k("Obnovování spojení"), verifying: k("Ověřování dat"), finalizing: k("Dokončování na serveru"), completed: k("Dokončeno"), failed: k("Chyba"), cancelled: k("Zrušeno") };
const FINALIZE_TEXT = { pending: k("čeká"), running: k("probíhá"), done: k("dokončeno"), unknown: k("nepotvrzeno – ověří se při obnovení"), failed: k("selhalo") };
const RUNNING = new Set(["connecting", "transferring", "verifying", "finalizing"]);
const FINAL = new Set(["completed", "failed", "cancelled"]);

function errorCode(error) { return error?.code && /^[A-Z_]+$/.test(error.code) ? error.code : (/(?:^|: )([A-Z][A-Z0-9_]{3,63}):/.exec(String(error?.message || ""))?.[1] || ""); }
function errorText(error) {
  const code = errorCode(error);
  if (ERROR_TEXT[code]) return `${t(ERROR_TEXT[code])} (${code})`;
  return String(error?.message || error || t("Neznámá chyba.")).replace(/^Error invoking remote method '[^']+': (Error: )?/, "");
}
function normalizePath(value) {
  const raw = String(value || "").trim();
  if (!raw.startsWith("/")) throw new Error(t("Cesta musí začínat znakem /."));
  const parts = [];
  for (const part of raw.split("/")) { if (!part || part === ".") continue; if (part === "..") parts.pop(); else parts.push(part); }
  return `/${parts.join("/")}`;
}
function joinPath(base, name) { return normalizePath(`${base === "/" ? "" : base}/${name}`); }
function parentPath(value) { const parts = normalizePath(value).split("/").filter(Boolean); parts.pop(); return `/${parts.join("/")}`; }
function selectedSessionId() { return state.sessionId; }
function currentSession() { return state.sessions.find((session) => session.sessionId === selectedSessionId()); }
function selectedEntries() { return state.entries.filter((entry) => state.selected.has(entry.path)); }
function bytes(value) { const units = ["B", "KiB", "MiB", "GiB", "TiB"]; let amount = Number(value || 0); let unit = 0; while (amount >= 1024 && unit < units.length - 1) { amount /= 1024; unit += 1; } return `${amount.toLocaleString(i18n.locale(), { maximumFractionDigits: 1 })} ${units[unit]}`; }
function rate(value) { return value > 0 ? `${bytes(value)}/s` : "—"; }
function duration(seconds) {
  if (seconds === null || seconds === undefined || !Number.isFinite(seconds)) return t("Výpočet času…");
  const s = Math.max(0, Math.round(seconds));
  if (s < 60) return t("přibližně {s} s", { s });
  if (s < 3600) return t("přibližně {m} min {s} s", { m: Math.floor(s / 60), s: s % 60 });
  return t("přibližně {h} h {m} min", { h: Math.floor(s / 3600), m: Math.floor((s % 3600) / 60) });
}
function setStatus(message, error = false) { elements.status.textContent = message; elements.status.classList.toggle("error", error); }
function validName(value) { return Boolean(value && !/[\/\0\r\n]/.test(value) && value !== "." && value !== ".."); }

// In-page: the system WebViews do not all implement the browser's own prompt.
function askName(title, initial = "") {
  return new Promise((resolve) => {
    const dialog = byId("nameDialog"), input = byId("nameInput");
    byId("nameTitle").textContent = title;
    input.value = initial;
    const close = () => {
      dialog.removeEventListener("close", close);
      resolve(dialog.returnValue === "ok" && validName(input.value.trim()) ? input.value.trim() : null);
    };
    dialog.addEventListener("close", close);
    dialog.returnValue = "";
    dialog.showModal();
    input.focus();
    const dot = initial.lastIndexOf(".");
    input.setSelectionRange(0, dot > 0 ? dot : initial.length);
  });
}

function setBusy(value, label = t("Pracuji…")) {
  state.busy = value; elements.busyOverlay.hidden = !value; elements.busyLabel.textContent = label;
  for (const element of [elements.sessionSelect, elements.refreshSessionsButton, elements.rootButton, elements.upButton, elements.refreshButton, elements.newFileButton, elements.mkdirButton, elements.uploadButton]) element.disabled = value || (!selectedSessionId() && element !== elements.sessionSelect && element !== elements.refreshSessionsButton);
  updateActions();
}

function updateActions() {
  const selected = selectedEntries(); const enabled = Boolean(selectedSessionId()) && !state.busy;
  elements.downloadButton.disabled = !enabled || !selected.length;
  for (const button of [elements.zipButton, elements.tarGzButton, elements.tarButton]) button.disabled = !enabled || !selected.length;
  elements.selectAllCheckbox.checked = Boolean(state.visibleEntries.length) && state.visibleEntries.every((entry) => state.selected.has(entry.path));
  elements.selectAllCheckbox.indeterminate = state.visibleEntries.some((entry) => state.selected.has(entry.path)) && !elements.selectAllCheckbox.checked;
  elements.selectionInfo.textContent = `${t("{count} položek · {selected} vybráno", { count: state.visibleEntries.length, selected: selected.length })}${selected.length ? ` · ${bytes(selected.reduce((sum, entry) => sum + (entry.type === "directory" ? 0 : entry.size), 0))}` : ""}`;
}

// ---- privilege prompts ------------------------------------------------------------------------

async function privileges() {
  const requestGeneration = state.generation;
  try { return await sessionResult(api.files.privileges(selectedSessionId()), requestGeneration); }
  catch { if (requestGeneration !== state.generation) return; return { mode: "unknown", username: currentSession()?.username || "" }; }
}

// Offers the shared sudo mechanism; resolves to options for the retried call or null.
function askSudo(reason, { error = "", privilege = null } = {}) {
  return new Promise((resolve) => {
    const needsPassword = !privilege || privilege.mode === "sudo-password" || privilege.mode === "unknown";
    elements.sudoReason.textContent = reason;
    elements.sudoError.hidden = !error; elements.sudoError.textContent = error;
    elements.sudoAccount.textContent = privilege?.username || currentSession()?.username || "";
    elements.sudoPasswordRow.hidden = !needsPassword || privilege?.sudoCached === true;
    elements.sudoPassword.value = "";
    const close = () => {
      elements.sudoDialog.removeEventListener("close", close);
      const ok = elements.sudoDialog.returnValue === "ok";
      const password = elements.sudoPassword.value;
      elements.sudoPassword.value = "";
      resolve(ok ? { sudo: true, ...(password ? { sudoPassword: password } : {}), rememberSudo: elements.sudoRemember.checked } : null);
    };
    elements.sudoDialog.addEventListener("close", close);
    elements.sudoDialog.returnValue = "";
    elements.sudoDialog.showModal();
    if (!elements.sudoPasswordRow.hidden) elements.sudoPassword.focus();
  });
}

// Runs action(options); on insufficient permissions offers sudo (password re-asked on rejection).
async function withPrivilege(reason, action, initial = {}) {
  const requestGeneration = state.generation;
  try {
    let options = initial;
    const sessionId = selectedSessionId();
    for (let attempt = 0; attempt < 5; attempt += 1) {
      try { return { value: await sessionResult(action(options), requestGeneration), options }; }
      catch (error) { if (requestGeneration !== state.generation) return;
        const code = errorCode(error);
        if (!NEEDS_SUDO.has(code) && code !== "SUDO_PASSWORD_INCORRECT") throw error;
        // After the user approved sudo (remembered in Main memory) for this session, retry silently once.
        if (!options.sudo && state.sudoAccepted.has(sessionId) && code !== "SUDO_PASSWORD_REQUIRED") { options = { ...initial, sudo: true }; continue; }
        const privilege = await sessionResult(privileges(), requestGeneration);
        if (privilege.mode === "root" && code !== "SUDO_PASSWORD_INCORRECT") throw error; // Root sees the real filesystem error.
        if (privilege.mode === "none") throw Object.assign(new Error(`SUDO_NOT_PERMITTED: ${ERROR_TEXT[code] ? t(ERROR_TEXT[code]) : ""}`), { code: privilege.sudoInstalled ? "SUDO_NOT_PERMITTED" : "SUDO_UNAVAILABLE" });
        const answer = await sessionResult(askSudo(reason, { privilege: code === "SUDO_PASSWORD_INCORRECT" || code === "SUDO_PASSWORD_REQUIRED" ? { ...privilege, mode: "sudo-password", sudoCached: false } : privilege,
          error: code === "SUDO_PASSWORD_INCORRECT" ? t(ERROR_TEXT.SUDO_PASSWORD_INCORRECT) : options.sudo ? errorText(error) : "" }), requestGeneration);
        if (!answer) throw Object.assign(new Error(t("Operace byla zrušena.")), { code: "CANCELED" });
        if (answer.rememberSudo) state.sudoAccepted.add(sessionId); else state.sudoAccepted.delete(sessionId);
        options = { ...initial, ...answer };
      }
    }
    throw new Error(t("Sudo autorizace se nezdařila."));
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

// ---- directory view ---------------------------------------------------------------------------

function renderBreadcrumbs() {
  const fragment = document.createDocumentFragment(); let current = "";
  const append = (label, target) => { const button = document.createElement("button"); button.type = "button"; button.className = "crumb"; button.textContent = label; button.addEventListener("click", () => loadDirectory(target)); fragment.append(button); };
  append("/", "/");
  for (const part of state.currentPath.split("/").filter(Boolean)) { const separator = document.createElement("span"); separator.className = "crumb-sep"; separator.textContent = "›"; fragment.append(separator); current += `/${part}`; append(part, current); }
  elements.breadcrumbs.replaceChildren(fragment); elements.breadcrumbs.scrollLeft = elements.breadcrumbs.scrollWidth;
}

function compareEntries(left, right) {
  const leftDir = left.type === "directory" || left.targetType === "directory"; const rightDir = right.type === "directory" || right.targetType === "directory";
  if (leftDir && !rightDir) return -1;
  if (rightDir && !leftDir) return 1;
  const key = state.sortKey; let result;
  if (key === "size") result = left.size - right.size;
  else if (key === "modifiedAt") result = Date.parse(left.modifiedAt || 0) - Date.parse(right.modifiedAt || 0);
  else result = String(left[key] || "").localeCompare(String(right[key] || ""), i18n.locale(), { numeric: true, sensitivity: "base" });
  return result * state.sortDirection;
}

function typeLabel(item) {
  if (item.type === "directory") return t("složka");
  if (item.type === "symlink") return item.targetType === "directory" ? t("odkaz → složka") : item.targetType === "missing" ? t("odkaz (neplatný)") : t("odkaz → soubor");
  return item.name.split(".").pop()?.toUpperCase() || t("soubor");
}

function renderEntries() {
  const query = elements.filterInput.value.trim().toLocaleLowerCase(i18n.locale());
  state.visibleEntries = state.entries.filter((entry) => !query || entry.name.toLocaleLowerCase(i18n.locale()).includes(query)).sort(compareEntries);
  const fragment = document.createDocumentFragment();
  for (const item of state.visibleEntries) {
    const isDir = item.type === "directory" || item.targetType === "directory";
    const row = document.createElement("tr"); row.dataset.path = item.path; row.dataset.type = item.type; row.classList.toggle("selected", state.selected.has(item.path));
    const checkCell = document.createElement("td"); const checkbox = document.createElement("input"); checkbox.type = "checkbox"; checkbox.checked = state.selected.has(item.path); checkbox.dataset.select = item.path; checkCell.append(checkbox); row.append(checkCell);
    const name = document.createElement("td"); name.className = "file-name"; const icon = document.createElement("span"); icon.className = "file-icon"; icon.textContent = item.type === "directory" ? "📁" : item.type === "symlink" ? (isDir ? "↗📁" : "↗") : "📄"; name.append(icon, document.createTextNode(item.name)); row.append(name);
    for (const value of [typeLabel(item), isDir ? "—" : bytes(item.size), item.modifiedAt ? new Date(item.modifiedAt).toLocaleString(i18n.locale()) : "—"]) { const cell = document.createElement("td"); cell.className = "file-meta"; cell.textContent = value; row.append(cell); }
    const actions = document.createElement("td"); const wrap = document.createElement("div"); wrap.className = "row-actions"; for (const [label, action] of [[isDir ? t("Otevřít") : t("Upravit"), "open"], ["⋯", "menu"]]) { const button = document.createElement("button"); button.type = "button"; button.className = "row-action"; button.textContent = label; button.dataset.rowAction = action; button.dataset.path = item.path; wrap.append(button); } actions.append(wrap); row.append(actions); fragment.append(row);
  }
  if (!state.visibleEntries.length) { const row = document.createElement("tr"); const cell = document.createElement("td"); cell.colSpan = 6; cell.className = "empty"; cell.textContent = query ? t("Filtru neodpovídá žádná položka.") : t("Adresář je prázdný."); row.append(cell); fragment.append(row); }
  elements.filesBody.replaceChildren(fragment); updateActions();
}

function selectPath(remotePath, options = {}) {
  const index = state.visibleEntries.findIndex((entry) => entry.path === remotePath);
  if (options.range && state.anchorPath) {
    const anchor = state.visibleEntries.findIndex((entry) => entry.path === state.anchorPath); if (anchor >= 0 && index >= 0) for (let position = Math.min(anchor, index); position <= Math.max(anchor, index); position += 1) state.selected.add(state.visibleEntries[position].path);
  } else if (options.toggle) { if (state.selected.has(remotePath)) state.selected.delete(remotePath); else state.selected.add(remotePath); state.anchorPath = remotePath; }
  else { state.selected = new Set([remotePath]); state.anchorPath = remotePath; }
  renderEntries();
}

async function loadSessions() {
  if (sessionsLoading) return;
  sessionsLoading = true;
  try {
    const sessions = (await api.sessions.list()).filter((session) => session.state === "connected");
    const previous = state.sessionId;
    const next = api.sessions.reconcile(endedSessionId || previous, sessions);
    state.sessions = sessions;
    for (const session of sessions) state.transferSessionNames.set(session.sessionId, api.sessions.displayName(session));
    elements.sessionSelect.replaceChildren(new Option(sessions.length ? t("Vyberte relaci…") : t("Žádná připojená relace"), ""));
    for (const session of sessions) elements.sessionSelect.add(new Option(api.sessions.displayName(session), session.sessionId));
    elements.sessionSelect.value = next.id;
    if (next.reason === "gone") endedSessionId ||= previous;
    if (next.id !== previous) { resetSession(next.id, next.reason === "gone"); if (next.id) void loadDirectory("/"); }
    if (next.reason === "gone") setStatus(t("Relace skončila. Vyberte server."), true);
    if (next.reason === "choose" && !globalThis.chjPanels?.active()) api.sessions.offerChoice(elements.sessionSelect, sessions, t("Vyberte relaci…"));
    globalThis.chjPanels?.syncSessions(sessions);
  } finally { sessionsLoading = false; }
}

function resetSession(id, preserveDraft = false) {
  state.generation += 1;
  state.sessionId = id;
  if (!preserveDraft && state.edit?.editId) void api.files.closeText(state.edit.editId).catch(() => {});
  for (const dialog of document.querySelectorAll("dialog[open]")) dialog.close();
  elements.sudoPassword.value = ""; elements.planPassword.value = "";
  if (!preserveDraft) {
    elements.editor.hidden = true; state.editor?.setValue("");
    Object.assign(state, { editorPath: null, savedText: "", edit: null });
  }
  elements.saveEditorButton.disabled = !id; elements.downloadEditorButton.disabled = !id;
  Object.assign(state, { currentPath: "/", entries: [], visibleEntries: [], selected: new Set(), anchorPath: null,
    listPrivileged: false });
  state.sudoAccepted.clear(); state.transferSelected.clear();
  elements.pathInput.value = "/"; elements.filterInput.value = "";
  hideContextMenu(); renderBreadcrumbs(); renderEntries(); queueTransferRender(); setBusy(false);
}

async function loadDirectory(requested = state.currentPath) {
  const requestGeneration = state.generation;
  if (!selectedSessionId() || state.busy) return; const target = normalizePath(requested); setBusy(true, t("Načítám {path}…", { path: target })); hideContextMenu();
  try {
    const { value: entries, options } = await sessionResult(withPrivilege(t("Adresář {path} nelze číst pod účtem SSH. Zobrazit jeho obsah se sudo?", { path: target }),
      (opts) => api.files.list(selectedSessionId(), target, opts)), requestGeneration);
    state.listPrivileged = options.sudo === true;
    state.currentPath = target; state.entries = entries; state.selected.clear(); state.anchorPath = null; elements.pathInput.value = target; renderBreadcrumbs(); renderEntries();
    setStatus(`${t("Načteno {count} položek z {path}", { count: entries.length, path: target })}${state.listPrivileged ? " (sudo)" : ""}.`);
  }
  catch (error) { if (requestGeneration !== state.generation) return; if (errorCode(error) !== "CANCELED") setStatus(errorText(error), true); }
  finally { if (requestGeneration === state.generation) { setBusy(false);} }
}

async function mutate(label, reason, action) {
  const requestGeneration = state.generation;
  if (state.busy) return; setBusy(true, label);
  try { const { value: result } = await sessionResult(withPrivilege(reason, action), requestGeneration); if (result?.canceled) { setStatus(t("Operace byla zrušena.")); return; } setBusy(false); await sessionResult(loadDirectory(state.currentPath), requestGeneration); }
  catch (error) { if (requestGeneration !== state.generation) return; setStatus(errorCode(error) === "CANCELED" ? t("Operace byla zrušena.") : errorText(error), errorCode(error) !== "CANCELED"); }
  finally { if (requestGeneration === state.generation) { setBusy(false);} }
}

// ---- Monaco editor ----------------------------------------------------------------------------

function languageFor(remotePath) {
  const extension = remotePath.toLowerCase().split(".").pop();
  return ({ js: "javascript", mjs: "javascript", cjs: "javascript", ts: "typescript", tsx: "typescript", json: "json", html: "html", htm: "html", css: "css", scss: "scss", less: "less", md: "markdown", sh: "shell", bash: "shell", zsh: "shell", py: "python", go: "go", java: "java", c: "c", h: "c", cpp: "cpp", hpp: "cpp", rs: "rust", php: "php", sql: "sql", xml: "xml", yaml: "yaml", yml: "yaml", ini: "ini", toml: "ini", conf: "ini", dockerfile: "dockerfile" })[extension] || (remotePath.toLowerCase().endsWith("dockerfile") ? "dockerfile" : "plaintext");
}

function ensureMonaco() {
  if (state.monaco) return Promise.resolve(state.monaco); if (state.monacoPromise) return state.monacoPromise;
  state.monacoPromise = new Promise((resolve, reject) => { const amd = window.require; if (!amd?.config) return reject(new Error(t("Monaco AMD loader není dostupný."))); amd.config({ paths: { vs: "vendor/monaco/vs" }, preferScriptTags: true }); amd(["vs/editor/editor.main"], () => { if (!window.monaco?.editor) return reject(new Error(t("Monaco Editor se nepodařilo inicializovat."))); state.monaco = window.monaco; resolve(window.monaco); }, reject); }).catch((error) => { state.monacoPromise = null; throw error; });
  return state.monacoPromise;
}

function updateDirtyState() { const dirty = Boolean(state.editor && state.editorPath && state.editor.getValue() !== state.savedText); elements.editorDirty.hidden = !dirty; return dirty; }

function renderEditorMeta() {
  const edit = state.edit;
  elements.editorPrivilege.hidden = !edit?.privileged;
  elements.editorPrivilege.textContent = edit?.privileged ? "sudo" : "";
  elements.editorTarget.hidden = !edit?.link;
  elements.editorTarget.textContent = edit?.link ? `↗ ${t("Symbolický odkaz – upravuje se cílový soubor {path}; odkaz zůstane zachován.", { path: edit.resolvedPath })}` : "";
}

async function saveEditor() {
  const requestGeneration = state.generation;
  try {
    if (!state.editorPath || !state.editor || state.busy || !state.edit || state.edit.sessionId !== selectedSessionId()) return; setBusy(true, t("Ukládám soubor…"));
    const text = state.editor.getValue();
    const edit = state.edit;
    const editorPath = state.editorPath;
    const base = { editId: edit.editId, ...(elements.editorBackup.checked ? { backup: true } : {}), ...(edit.privileged || !edit.directSave ? { sudo: true } : {}) };
    try {
      const { value: result, options } = await sessionResult(withPrivilege(t("Uložení {path} vyžaduje oprávnění správce. Soubor se uloží atomicky se zachováním vlastníka, práv, ACL, xattr a SELinux kontextu.", { path: state.editorPath }), async (opts) => {
        const requestGeneration = state.generation;
        try {
          const outcome = await sessionResult(api.files.saveText(edit.sessionId, editorPath, text, { ...base, ...opts }), requestGeneration);
          if (!outcome.ok) throw Object.assign(new Error(`${outcome.error.code}: ${outcome.error.message}`), { code: outcome.error.code, detail: outcome.error });
          return outcome.value;
        } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
      }, base.sudo ? { sudo: true } : {}), requestGeneration);
      if (options.sudo) { edit.privileged = true; renderEditorMeta(); }
      state.savedText = text; elements.editorSize.textContent = bytes(result.size); updateDirtyState();
      setStatus(`${t("Atomicky uloženo {size}", { size: bytes(result.size) })}${result.link ? ` ${t("do cíle odkazu {path}", { path: result.resolvedPath })}` : ""}${options.sudo ? " (sudo)" : ""}${result.backupPath ? ` · ${t("záloha {path}", { path: result.backupPath })}` : ""}${result.recoveryAvailable ? ` · ${t("pracovní kopie zůstala k dispozici")}` : ""}.`);
    } catch (error) { if (requestGeneration !== state.generation) return;
      const code = errorCode(error);
      if (code === "CANCELED") setStatus(t("Uložení bylo zrušeno; změny zůstávají v editoru."));
      else if (code === "FILE_CONFLICT") {
        setStatus(errorText(error), true);
        if (window.confirm(`${t(ERROR_TEXT.FILE_CONFLICT)}\n\n${t("Načíst aktuální verzi ze serveru? Vaše neuložené změny budou zahozeny.")}\n${t("(Zrušit = ponechat změny v editoru)")}`)) { state.savedText = state.editor.getValue(); setBusy(false); await sessionResult(openText(state.editorPath, { force: true }), requestGeneration); }
      } else setStatus(`${errorText(error)}${error.detail?.recoveryId ? ` ${t("Kopie pro obnovu: {id}.", { id: error.detail.recoveryId })}` : ""}`, true);
    } finally { if (requestGeneration === state.generation) { setBusy(false);} }
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

async function openText(remotePath, { force = false } = {}) {
  const requestGeneration = state.generation;
  if (state.busy) return;
  if (!force && state.editorPath && updateDirtyState() && !window.confirm(t("Otevřený soubor obsahuje neuložené změny. Zahodit je a otevřít jiný soubor?"))) return;
  setBusy(true, t("Otevírám {path}…", { path: remotePath }));
  try {
    const [{ value: result, options }, monaco] = await sessionResult(Promise.all([
      withPrivilege(t("Soubor {path} nelze číst pod účtem SSH. Otevřít jej se sudo?", { path: remotePath }), (opts) => api.files.readText(selectedSessionId(), remotePath, opts)),
      ensureMonaco()
    ]), requestGeneration);
    const language = languageFor(result.resolvedPath || remotePath);
    if (state.edit?.editId) void api.files.closeText(state.edit.editId).catch(() => {});
    if (!state.editor) {
      state.editor = monaco.editor.create(elements.editorHost, { value: result.text, language, theme: "vs-dark", automaticLayout: true, fontSize: 13, lineHeight: 20, minimap: { enabled: true }, smoothScrolling: true, bracketPairColorization: { enabled: true }, guides: { bracketPairs: true }, renderWhitespace: "selection", formatOnPaste: true, scrollBeyondLastLine: false });
      state.editor.addCommand(monaco.KeyMod.CtrlCmd | monaco.KeyCode.KeyS, () => void saveEditor());
      state.editor.onDidChangeModelContent(updateDirtyState); state.editor.onDidChangeCursorPosition((event) => { elements.editorPosition.textContent = t("Řádek {line}, sloupec {column}", { line: event.position.lineNumber, column: event.position.column }); });
    } else { state.editor.setValue(result.text); monaco.editor.setModelLanguage(state.editor.getModel(), language); }
    state.edit = { sessionId: selectedSessionId(), editId: result.editId, resolvedPath: result.resolvedPath || result.path, link: result.link === true, directSave: result.directSave !== false, privileged: options.sudo === true };
    state.editorPath = result.path; state.savedText = result.text; elements.editorPath.textContent = result.path; elements.editorPath.title = result.path; elements.editorLanguage.textContent = language; elements.editorSize.textContent = bytes(result.size);
    elements.saveEditorButton.disabled = false; elements.downloadEditorButton.disabled = false;
    elements.editorBackup.checked = false; renderEditorMeta(); updateDirtyState(); elements.editor.hidden = false; state.editor.focus();
    setStatus(`${t("Otevřen {path}", { path: remotePath })}${result.link ? ` (${t("odkaz na {path}", { path: result.resolvedPath })})` : ""}${options.sudo ? ` ${t("se sudo")}` : ""}${!result.directSave && !options.sudo ? ` · ${t("uložení bude vyžadovat sudo")}` : ""}.`);
  } catch (error) { if (requestGeneration !== state.generation) return; if (errorCode(error) !== "CANCELED") setStatus(errorText(error), true); }
  finally { if (requestGeneration === state.generation) { setBusy(false);} }
}

function closeEditor() {
  if (!elements.editor.hidden && updateDirtyState() && !window.confirm(t("Soubor obsahuje neuložené změny. Opravdu zavřít editor?"))) return;
  if (state.edit?.editId) void api.files.closeText(state.edit.editId).catch(() => {});
  elements.editor.hidden = true; state.editorPath = null; state.savedText = ""; state.edit = null;
}

// ---- transfers --------------------------------------------------------------------------------

function showPlan(plan) {
  return new Promise((resolve) => {
    const upload = plan.direction === "upload";
    elements.planTitle.textContent = plan.title || `${api.sessions.displayName(currentSession())} — ${upload ? t("Nahrání na server") : t("Stažení ze serveru")}`;
    elements.planSummary.textContent = `${t("{files} souborů", { files: plan.files })}${plan.directories ? ` ${t("a {directories} složek", { directories: plan.directories })}` : ""}, ${t("celkem {size}", { size: bytes(plan.bytes) })} → ${plan.destination}`;
    elements.planConflicts.hidden = !plan.conflictCount;
    elements.planConflictText.textContent = t("{count} cílových souborů již existuje. Přepsání zachová jejich vlastníka, práva, ACL a atributy a proběhne atomicky až po úplném ověřeném přenosu.", { count: plan.conflictCount });
    elements.planConflictList.replaceChildren(...plan.conflicts.map((item) => { const li = document.createElement("li"); li.textContent = item; return li; }));
    elements.planSkipped.hidden = !plan.skippedCount;
    elements.planSkipped.textContent = t("{count} položek bude vynecháno (symbolické odkazy, speciální soubory nebo kolize se složkou).", { count: plan.skippedCount });
    elements.planSudo.hidden = !plan.requiresSudo;
    elements.planPasswordRow.hidden = !plan.sudoPasswordRequired;
    elements.planPassword.value = "";
    elements.planError.hidden = !plan.error; elements.planError.textContent = plan.error || "";
    elements.planSkip.hidden = !plan.conflictCount; elements.planOverwrite.hidden = !plan.conflictCount; elements.planStart.hidden = Boolean(plan.conflictCount);
    const close = () => {
      elements.planDialog.removeEventListener("close", close);
      const choice = elements.planDialog.returnValue;
      const password = elements.planPassword.value; elements.planPassword.value = "";
      resolve(["start", "skip", "overwrite"].includes(choice) ? { conflict: choice === "start" ? "fail" : choice, ...(plan.requiresSudo ? { sudo: true, rememberSudo: elements.planRemember.checked } : {}), ...(password ? { sudoPassword: password } : {}) } : null);
    };
    elements.planDialog.addEventListener("close", close);
    elements.planDialog.returnValue = "";
    elements.planDialog.showModal();
    if (plan.requiresSudo && plan.sudoPasswordRequired) elements.planPassword.focus();
  });
}

async function runPlan(plan) {
  const requestGeneration = state.generation;
  try {
    if (!plan || plan.canceled) { setStatus(t("Výběr byl zrušen.")); return; }
    if (!plan.files && !plan.directories) { setStatus(t("Výběr neobsahuje žádné přenositelné soubory.")); return; }
    for (let attempt = 0; attempt < 4; attempt += 1) {
      const choice = await sessionResult(showPlan(plan), requestGeneration);
      if (!choice) { setStatus(t("Přenos nebyl spuštěn.")); return; }
      try {
        const started = await sessionResult(api.files.transfers.start(plan.planId, { ...choice, sessionId: selectedSessionId() }), requestGeneration);
        setStatus(`${t("Zařazeno {count} přenosů", { count: started.jobs })}${started.skipped ? `, ${t("přeskočeno {count}", { count: started.skipped })}` : ""}.`);
        setTransfersCollapsed(false);
        return;
      } catch (error) { if (requestGeneration !== state.generation) return;
        const code = errorCode(error);
        if (code === "SUDO_PASSWORD_INCORRECT" || code === "SUDO_PASSWORD_REQUIRED") { plan = { ...plan, sudoPasswordRequired: true, error: errorText(error) }; continue; }
        setStatus(errorText(error), true); return;
      }
    }
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

async function uploadSelection() {
  const requestGeneration = state.generation;
  try {
    if (state.busy || !selectedSessionId()) return;
    if (!api.files.transfers) { await sessionResult(mutate(t("Nahrávám soubory a složky…"), "", () => api.files.upload(selectedSessionId(), state.currentPath)), requestGeneration); return; }
    setBusy(true, t("Připravuji nahrání…"));
    let plan;
    try { plan = await sessionResult(api.files.transfers.planUpload(selectedSessionId(), state.currentPath), requestGeneration); }
    catch (error) { if (requestGeneration !== state.generation) return; setStatus(errorText(error), true); }
    finally { if (requestGeneration === state.generation) { setBusy(false);} }
    if (plan) await sessionResult(runPlan(plan), requestGeneration);
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

async function downloadSelection(paths = selectedEntries().map((item) => item.path)) {
  const requestGeneration = state.generation;
  try {
    if (!paths.length || state.busy) return;
    if (!api.files.transfers) {
      const items = selectedEntries(); setBusy(true, t("Stahuji {count} položek…", { count: items.length }));
      try { const result = items.length === 1 && items[0].type !== "directory" ? await sessionResult(api.files.download(selectedSessionId(), items[0].path), requestGeneration) : await sessionResult(api.files.downloadMany(selectedSessionId(), items.map((item) => item.path)), requestGeneration); if (!result.canceled) setStatus(t("Staženo {count} položek, {size}.", { count: result.entries || 1, size: bytes(result.size) })); }
      catch (error) { if (requestGeneration !== state.generation) return; setStatus(errorText(error), true); }
      finally { if (requestGeneration === state.generation) { setBusy(false);} }
      return;
    }
    let plan;
    try {
      plan = (await sessionResult(withPrivilege(t("Vybrané položky nelze číst pod účtem SSH. Stáhnout je se sudo? Chráněné soubory se nejprve zkopírují do soukromého dočasného adresáře účtu."),
        (opts) => api.files.transfers.planDownload(selectedSessionId(), paths, opts), state.listPrivileged ? { sudo: true } : {}), requestGeneration)).value;
    } catch (error) { if (requestGeneration !== state.generation) return; if (errorCode(error) !== "CANCELED") setStatus(errorText(error), true); return; }
    await sessionResult(runPlan(plan), requestGeneration);
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

async function archiveSelection(format) {
  const requestGeneration = state.generation;
  const items = selectedEntries(); if (!items.length || state.busy) return; setBusy(true, t("Vytvářím {format} archiv…", { format: format.toUpperCase() }));
  try { const result = await sessionResult(api.files.downloadArchive(selectedSessionId(), items.map((item) => item.path), format), requestGeneration); if (!result.canceled) setStatus(t("Archiv {format} uložen: {size}, {count} položek.", { format: format.toUpperCase(), size: bytes(result.size), count: result.entries })); }
  catch (error) { if (requestGeneration !== state.generation) return; setStatus(errorText(error), true); }
  finally { if (requestGeneration === state.generation) { setBusy(false);} }
}

function setTransfersCollapsed(collapsed) {
  elements.transfers.classList.toggle("collapsed", collapsed);
  elements.transfersToggle.setAttribute("aria-expanded", String(!collapsed));
  try { localStorage.setItem("chj.fm.transfersCollapsed", collapsed ? "1" : "0"); } catch {}
}

function applyTransferUpdate(update) {
  if (update.full) state.transfers = new Map();
  for (const id of update.removed || []) { state.transfers.delete(id); state.transferSelected.delete(id); }
  for (const job of update.jobs || []) state.transfers.set(job.id, job);
  if (update.summary) state.transferSummary = update.summary;
  if (update.settings) {
    elements.concurrencySelect.value = String(update.settings.maxConcurrent);
    elements.autoRetryCheckbox.checked = update.settings.autoRetry;
    elements.verifyCheckbox.checked = update.settings.verify;
  }
  queueTransferRender();
  if ((update.jobs || []).some((job) => job.state === "completed")) globalThis.chjPanels?.transfersFinished();
}

function queueTransferRender() {
  if (state.renderQueued) return;
  state.renderQueued = true;
  requestAnimationFrame(() => { state.renderQueued = false; renderTransfers(); });
}

function jobStatusText(job) {
  let text = STATE_TEXT[job.state] ? t(STATE_TEXT[job.state]) : job.state;
  if (job.state === "reconnecting" && job.nextRetryAt) text += ` (${t("pokus {attempt}, za {seconds} s", { attempt: job.attempts, seconds: Math.max(0, Math.ceil((job.nextRetryAt - Date.now()) / 1000)) })})`;
  if (job.authRequired) text += ` – ${t("vyžaduje sudo")}`;
  return text;
}

function buildTransferNode(job) {
  const node = document.createElement("div"); node.className = "transfer"; node.dataset.id = job.id;
  node.innerHTML = `<input type="checkbox" aria-label="${escapeHtml(t("Vybrat přenos"))}"><div class="t-main"><div class="t-title"><strong></strong><span class="t-direction"></span><span class="t-badge" hidden>sudo</span></div><div class="t-paths"></div><div class="progress" role="progressbar" aria-valuemin="0" aria-valuemax="100"><span></span></div><div class="t-stats"></div><div class="t-error" hidden></div></div><div class="t-actions"></div>`;
  return node;
}

function actionButton(label, action, id, extra = "") { const button = document.createElement("button"); button.type = "button"; button.className = `button compact ${extra}`; button.textContent = label; button.dataset.transferAction = action; button.dataset.id = id; return button; }

function updateTransferNode(node, job) {
  node.classList.toggle("selected", state.transferSelected.has(job.id));
  node.querySelector("input").checked = state.transferSelected.has(job.id);
  node.querySelector(".t-title strong").textContent = job.name;
  node.querySelector(".t-direction").textContent = job.direction === "relay"
    ? `${identityName(job.sourceIdentity)} → ${identityName(job.identity)}${job.move ? ` · ${t("přesun")}` : ""}`
    : `${transferSessionName(job)} · ${job.direction === "upload" ? "Upload →" : "Download →"} ${job.target}${job.move ? ` · ${t("přesun")}` : ""}`;
  node.querySelector(".t-badge").hidden = job.mode !== "privileged";
  node.querySelector(".t-paths").textContent = `${t("Zdroj: {source} · Cíl: {target}", { source: job.source, target: job.target })}${job.resolvedTarget && job.resolvedTarget !== job.target ? ` (${t("cíl odkazu {path}", { path: job.resolvedTarget })})` : ""}`;
  const bar = node.querySelector(".progress");
  const value = job.state === "completed" ? 100 : job.percent;
  bar.classList.toggle("indeterminate", value === null && RUNNING.has(job.state));
  bar.classList.toggle("done", job.state === "completed"); bar.classList.toggle("error", job.state === "failed" || job.state === "cancelled");
  bar.classList.toggle("paused", ["paused", "interrupted", "reconnecting"].includes(job.state));
  bar.querySelector("span").style.width = `${value ?? 0}%`;
  if (value === null) bar.removeAttribute("aria-valuenow"); else bar.setAttribute("aria-valuenow", String(value));
  const stats = [];
  stats.push(`<b>${value === null ? (job.size === 0 ? "0 B" : "—") : `${value.toLocaleString(i18n.locale())} %`}</b>`);
  stats.push(escapeHtml(`${bytes(job.transferred)} / ${job.size === null ? t("neznámá velikost") : bytes(job.size)}`));
  if (job.state === "transferring") { stats.push(escapeHtml(t("Rychlost: {rate}", { rate: rate(job.speed) }))); stats.push(escapeHtml(t("Zbývá: {time}", { time: duration(job.eta) }))); }
  if (job.averageSpeed) stats.push(escapeHtml(t("Průměr: {rate}", { rate: rate(job.averageSpeed) })));
  stats.push(`${escapeHtml(t("Stav:"))} <span class="t-state ${job.state}">${escapeHtml(jobStatusText(job))}</span>`);
  if (job.moveResult) stats.push(escapeHtml(job.moveResult.state === "deleted" ? t("Zdroj odstraněn po ověření") : t("Zdroj ponechán: {reason}", { reason: t(MOVE_KEPT_TEXT[job.moveResult.reason] || MOVE_KEPT_TEXT["remove-failed"]) })));
  if (job.direction !== "download" || job.mode === "privileged") stats.push(escapeHtml(`${t("Dokončení na cíli: {state}", { state: FINALIZE_TEXT[job.finalize.state] ? t(FINALIZE_TEXT[job.finalize.state]) : job.finalize.state })}${job.finalize.state === "done" && job.finalize.metadataPreserved ? ` · ${t("metadata zachována")}` : ""}`));
  if (job.verification) stats.push(escapeHtml(t("Ověření: {method}", { method: job.verification.method === "sha256" ? (job.verification.matched ? t("SHA-256 shoda") : "SHA-256") : t("jen velikost") })));
  node.querySelector(".t-stats").innerHTML = stats.join("<span></span>");
  const errorNode = node.querySelector(".t-error");
  errorNode.hidden = !job.error || job.state === "completed"; errorNode.textContent = job.error ? errorText({ code: job.error.code, message: job.error.message }) : "";
  const actions = node.querySelector(".t-actions"); const buttons = [];
  if (job.actions.pause) buttons.push(actionButton(`⏸ ${t("Pozastavit")}`, "pause", job.id));
  if (job.actions.resume) buttons.push(actionButton(job.state === "interrupted" ? (job.authRequired ? `🔑 ${t("Pokračovat se sudo")}` : `↻ ${t("Obnovit")}`) : `▶ ${t("Pokračovat")}`, "resume", job.id));
  if (job.actions.overwrite) buttons.push(actionButton(t("Přepsat cíl"), "overwrite", job.id));
  if (job.actions.retry) buttons.push(actionButton(`⟲ ${t("Znovu od začátku")}`, "retry", job.id, "ghost"));
  if (job.actions.cancel) buttons.push(actionButton(`✕ ${t("Zrušit")}`, "cancel", job.id, "danger"));
  if (job.actions.remove) buttons.push(actionButton(t("Odebrat"), "remove", job.id, "ghost"));
  const signature = buttons.map((button) => button.dataset.transferAction + button.textContent).join("|");
  if (actions.dataset.signature !== signature) { actions.replaceChildren(...buttons); actions.dataset.signature = signature; }
}

function escapeHtml(value) { return String(value).replace(/[&<>"']/g, (char) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[char]); }

function identityName(identity) { return identity ? `${identity.username || ""}@${identity.host || ""}` : "—"; }

function transferSessionName(job) {
  return state.transferSessionNames.get(job.sessionId) || api.sessions.displayName({
    label: job.sessionId || "—", username: job.identity?.username || "", host: job.identity?.host || ""
  });
}

function sessionTransfers() {
  if (globalThis.chjPanels?.active()) return [...state.transfers.values()];
  const session = currentSession();
  if (!session) return [];
  return [...state.transfers.values()].filter((job) => job.sessionId === session.sessionId || (
    !state.sessions.some((entry) => entry.sessionId === job.sessionId) &&
    job.identity?.profileId === session.profileId && job.identity?.host === session.host &&
    job.identity?.port === session.port && job.identity?.username === session.username
  ));
}

function transferSummary(jobs) {
  const counted = jobs.filter((job) => job.state !== "cancelled");
  const count = (state) => jobs.filter((job) => job.state === state).length;
  const sizesKnown = counted.every((job) => typeof job.size === "number");
  const totalBytes = counted.reduce((sum, job) => sum + (job.size || 0), 0);
  const transferredBytes = counted.reduce((sum, job) => sum + Math.min(job.transferred || 0, job.size ?? Infinity), 0);
  const active = jobs.filter((job) => RUNNING.has(job.state));
  const speed = active.reduce((sum, job) => sum + (job.speed || 0), 0);
  const remaining = counted.filter((job) => !["completed", "failed", "cancelled"].includes(job.state))
    .reduce((sum, job) => sum + Math.max(0, (job.size || 0) - (job.transferred || 0)), 0);
  let percent = sizesKnown && totalBytes > 0 ? Math.floor(transferredBytes / totalBytes * 1000) / 10
    : sizesKnown && counted.length && count("completed") === counted.length ? 100 : null;
  if (percent >= 100 && count("completed") !== counted.length) percent = 99.9;
  return { total: jobs.length, completed: count("completed"), active: active.length, waiting: count("waiting") + count("reconnecting"),
    paused: count("paused"), interrupted: count("interrupted"), failed: count("failed"), cancelled: count("cancelled"),
    totalBytes, transferredBytes, sizesKnown, percent, speed,
    eta: speed > 0 && active.every((job) => job.state !== "transferring" || job.eta !== null) ? Math.ceil(remaining / speed) : null };
}

function renderTransfers() {
  const jobs = sessionTransfers();
  const summary = transferSummary(jobs);
  if (!jobs.length || !summary) {
    elements.transferSummary.textContent = t("Žádné přenosy.");
    elements.transferOverall.querySelector("span").style.width = "0%"; elements.transferOverallText.textContent = "";
    elements.transferList.replaceChildren(Object.assign(document.createElement("div"), { className: "transfer-empty", textContent: t("Nahrané a stažené soubory se zobrazí zde i po přepnutí obrazovky nebo restartu aplikace.") }));
    state.transferNodes.clear();
  } else {
    const parts = [t("{count} souborů", { count: summary.total }), t("{count} dokončeno", { count: summary.completed }), t("{count} aktivní", { count: summary.active }), t("{count} čeká", { count: summary.waiting })];
    if (summary.paused) parts.push(t("{count} pozastaveno", { count: summary.paused }));
    if (summary.interrupted) parts.push(t("{count} přerušeno", { count: summary.interrupted }));
    if (summary.failed) parts.push(t("{count} s chybou", { count: summary.failed }));
    if (summary.cancelled) parts.push(t("{count} zrušeno", { count: summary.cancelled }));
    elements.transferSummary.textContent = parts.join(" · ");
    const bar = elements.transferOverall;
    bar.classList.toggle("indeterminate", summary.percent === null && summary.active > 0);
    bar.classList.toggle("done", summary.completed === summary.total - summary.cancelled && summary.total > summary.cancelled);
    bar.querySelector("span").style.width = `${summary.percent ?? 0}%`;
    elements.transferOverallText.textContent = `${summary.percent === null ? "—" : `${summary.percent.toLocaleString(i18n.locale())} %`} · ${bytes(summary.transferredBytes)} / ${summary.sizesKnown ? bytes(summary.totalBytes) : t("neznámá velikost")}${summary.active ? ` · ${rate(summary.speed)} · ${t("Zbývá: {time}", { time: duration(summary.eta) })}` : ""}`;
    const rank = (job) => RUNNING.has(job.state) ? 0 : ["waiting", "reconnecting"].includes(job.state) ? 1 : ["paused", "interrupted"].includes(job.state) ? 2 : job.state === "failed" ? 3 : 4;
    const ordered = jobs.sort((a, b) => rank(a) - rank(b) || (rank(a) === 4 ? (b.finishedAt || 0) - (a.finishedAt || 0) : a.createdAt - b.createdAt)).slice(0, 400);
    const keep = new Set(ordered.map((job) => job.id));
    for (const [id, node] of state.transferNodes) if (!keep.has(id)) { node.remove(); state.transferNodes.delete(id); }
    const empty = elements.transferList.querySelector(".transfer-empty"); if (empty) empty.remove();
    let previous = null;
    for (const job of ordered) {
      let node = state.transferNodes.get(job.id);
      if (!node) { node = buildTransferNode(job); state.transferNodes.set(job.id, node); }
      updateTransferNode(node, job);
      const expected = previous ? previous.nextSibling : elements.transferList.firstChild;
      if (expected !== node) elements.transferList.insertBefore(node, expected);
      previous = node;
    }
  }
  const selected = [...state.transferSelected].map((id) => state.transfers.get(id)).filter(Boolean);
  elements.pauseSelectedButton.disabled = !selected.some((job) => job.actions.pause);
  elements.resumeSelectedButton.disabled = !selected.some((job) => job.actions.resume);
  elements.cancelSelectedButton.disabled = !selected.some((job) => job.actions.cancel);
  elements.pauseAllButton.disabled = !jobs.some((job) => job.actions.pause);
  elements.resumeAllButton.disabled = !jobs.some((job) => job.actions.resume);
  elements.cancelAllButton.disabled = !jobs.some((job) => job.actions.cancel);
  elements.clearFinishedButton.disabled = !jobs.some((job) => job.actions.remove);
}

function transferTargetName() { return currentSession() ? api.sessions.displayName(currentSession()) : t("Přenosy"); }
// The job's own connection while it lives; after a reconnect, the one connection to the same server, if it is unambiguous.
function liveConnection(identity, previous) {
  if (!identity) return undefined;
  if (state.sessions.some((entry) => entry.sessionId === previous)) return previous;
  const same = state.sessions.filter((entry) => entry.profileId === identity.profileId && entry.host === identity.host && entry.port === identity.port && entry.username === identity.username);
  return same.length === 1 ? same[0].sessionId : undefined;
}
function jobConnections(job) {
  const sessionId = liveConnection(job.identity, job.sessionId), sourceSessionId = liveConnection(job.sourceIdentity, job.sourceSessionId);
  return { ...(sessionId ? { sessionId } : {}), ...(sourceSessionId ? { sourceSessionId } : {}) };
}

async function transferAction(action, ids) {
  const requestGeneration = state.generation;
  const visible = sessionTransfers();
  ids = ids === "all" ? visible.map((job) => job.id) : ids.filter((id) => visible.some((job) => job.id === id));
  const list = ids.map((id) => state.transfers.get(id));
  if (!list.length) return;
  const panels = globalThis.chjPanels?.active();
  // Panels have no single selected server: each job continues on its own connections.
  const each = async (call, options) => { if (panels) { for (const job of list) await call([job.id], { ...options, ...jobConnections(job) }); } else await call(ids, { ...options, sessionId: selectedSessionId() }); };
  if (!panels && ["resume", "retry", "overwrite"].includes(action) && list.some((job) => job.sessionId !== selectedSessionId()) &&
      !window.confirm(`${[...new Set(list.map(transferSessionName))].join("\n")}\n→ ${transferTargetName()}\n\n${t("Pokračovat")}`)) return;
  try {
    if (action === "pause") await sessionResult(api.files.transfers.pause(ids), requestGeneration);
    else if (action === "cancel") {
      if (!window.confirm(`${transferTargetName()}\n\n${t("Definitivně zrušit {count} přenosů? Dočasná data vytvořená aplikací budou odstraněna, existující cílové soubory zůstanou beze změny.", { count: list.filter((job) => job.actions.cancel).length })}`)) return;
      await sessionResult(api.files.transfers.cancel(ids), requestGeneration);
    } else if (action === "remove") await sessionResult(api.files.transfers.remove(ids), requestGeneration);
    else if (action === "retry") {
      if (!window.confirm(`${transferTargetName()}\n\n${t("Přenést soubor znovu od začátku? Dosud přenesená část bude zahozena.")}`)) return;
      const options = await sessionResult(transferAuthorization(list), requestGeneration);
      if (options !== null) await sessionResult(each(api.files.transfers.retry, options), requestGeneration);
    } else if (action === "overwrite") {
      if (!window.confirm(`${transferTargetName()}\n\n${t("Cíl byl mezitím změněn nebo již existuje. Přesto jej nahradit přeneseným souborem (se zachováním jeho metadat)?")}`)) return;
      const options = await sessionResult(transferAuthorization(list), requestGeneration);
      if (options !== null) await sessionResult(each(api.files.transfers.resume, { ...options, overwrite: true }), requestGeneration);
    } else if (action === "resume") {
      const options = await sessionResult(transferAuthorization(list), requestGeneration);
      if (options === null) return;
      await sessionResult(each(api.files.transfers.resume, options), requestGeneration);
    }
  } catch (error) { if (requestGeneration !== state.generation) return; setStatus(errorText(error), true); }
}

// Interrupted jobs that need sudo get a password prompt before resuming.
async function transferAuthorization(jobs) {
  const requestGeneration = state.generation;
  try {
    if (!jobs.some((job) => job.authRequired)) return {};
    const privilege = await sessionResult(privileges(), requestGeneration);
    if (privilege.mode === "none") { setStatus(t(ERROR_TEXT.SUDO_NOT_PERMITTED), true); return null; }
    const codes = new Set(jobs.map((job) => job.error?.code));
    return askSudo(t("Dokončení přenosu vyžaduje oprávnění správce (zápis do chráněného adresáře nebo čtení chráněného souboru)."), {
      privilege: codes.has("SUDO_PASSWORD_REQUIRED") || codes.has("SUDO_PASSWORD_INCORRECT") ? { ...privilege, mode: "sudo-password", sudoCached: false } : privilege,
      error: codes.has("SUDO_PASSWORD_INCORRECT") ? t(ERROR_TEXT.SUDO_PASSWORD_INCORRECT) : ""
    });
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

async function initTransfers() {
  if (!api.files?.transfers) { elements.transfers.hidden = true; return; }
  try { setTransfersCollapsed(localStorage.getItem("chj.fm.transfersCollapsed") === "1"); } catch {}
  api.files.transfers.onUpdate(applyTransferUpdate);
  const current = await api.files.transfers.list();
  applyTransferUpdate({ ...current, full: true });
  setInterval(() => { if ([...state.transfers.values()].some((job) => job.state === "reconnecting" || job.state === "transferring")) queueTransferRender(); }, 1000);
}

// ---- remaining actions ------------------------------------------------------------------------

async function openSelection() {
  const requestGeneration = state.generation;
  try { const item = selectedEntries()[0]; if (!item) return; if (item.type === "directory" || item.targetType === "directory") await sessionResult(loadDirectory(item.path), requestGeneration); else await sessionResult(openText(item.path), requestGeneration);
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}
async function renameSelection() {
  const requestGeneration = state.generation;
  try { const item = selectedEntries()[0]; if (!item || selectedEntries().length !== 1) return; const name = await askName(t("Nový název:"), item.name); if (!name || name === item.name) return; await sessionResult(mutate(t("Přejmenovávám…"), t("Přejmenování {path} vyžaduje oprávnění správce.", { path: item.path }), (opts) => api.files.rename(selectedSessionId(), item.path, joinPath(parentPath(item.path), name), opts)), requestGeneration);
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}
async function removeSelection() {
  const requestGeneration = state.generation;
  try { const items = selectedEntries(); if (!items.length || !window.confirm(`${api.sessions.displayName(currentSession())}\n\n${t("Opravdu trvale smazat {count} vybraných položek včetně obsahu vybraných složek?", { count: items.length })}`)) return; await sessionResult(mutate(t("Mažu vybrané položky…"), t("Smazání vybraných položek vyžaduje oprávnění správce."), (opts) => api.files.removeMany(selectedSessionId(), items.map((item) => item.path), true, opts)), requestGeneration);
  } catch (error) { if (requestGeneration !== state.generation) return; throw error; }
}

function hideContextMenu() { elements.contextMenu.hidden = true; }
function showContextMenu(event, remotePath) { event.preventDefault(); if (remotePath && !state.selected.has(remotePath)) selectPath(remotePath); elements.contextMenu.querySelector('[data-context="rename"]').disabled = state.selected.size !== 1; elements.contextMenu.querySelector('[data-context="open"]').disabled = state.selected.size !== 1; elements.contextMenu.hidden = false; const rect = elements.contextMenu.getBoundingClientRect(); elements.contextMenu.style.left = `${Math.max(6, Math.min(event.clientX, window.innerWidth - rect.width - 6))}px`; elements.contextMenu.style.top = `${Math.max(6, Math.min(event.clientY, window.innerHeight - rect.height - 6))}px`; }

elements.closeButton.addEventListener("click", () => { api.close(); });
elements.refreshSessionsButton.addEventListener("click", async () => { await loadSessions(); await loadDirectory(state.currentPath); });
elements.sessionSelect.addEventListener("change", () => {
  if (updateDirtyState() && !window.confirm(t("Soubor obsahuje neuložené změny. Opravdu zavřít editor?"))) { elements.sessionSelect.value = state.sessionId; return; }
  endedSessionId = "";
  resetSession(elements.sessionSelect.value);
  void loadDirectory("/");
});
elements.pathForm.addEventListener("submit", (event) => { event.preventDefault(); void loadDirectory(elements.pathInput.value); });
elements.rootButton.addEventListener("click", () => loadDirectory("/")); elements.upButton.addEventListener("click", () => loadDirectory(parentPath(state.currentPath))); elements.refreshButton.addEventListener("click", () => loadDirectory(state.currentPath));
elements.filterInput.addEventListener("input", renderEntries);
elements.selectAllCheckbox.addEventListener("change", () => { for (const item of state.visibleEntries) { if (elements.selectAllCheckbox.checked) state.selected.add(item.path); else state.selected.delete(item.path); } renderEntries(); });
for (const button of document.querySelectorAll("button.sort")) button.addEventListener("click", () => { const key = button.dataset.sort; if (state.sortKey === key) state.sortDirection *= -1; else { state.sortKey = key; state.sortDirection = 1; } for (const other of document.querySelectorAll("button.sort")) { other.classList.toggle("active", other === button); other.querySelector("span:not(.sort-label)").textContent = other === button ? (state.sortDirection > 0 ? "↑" : "↓") : ""; } renderEntries(); });
elements.newFileButton.addEventListener("click", async () => { const name = await askName(t("Název nového souboru:"), t("novy-soubor.txt")); if (!name) return; const target = joinPath(state.currentPath, name); void mutate(t("Vytvářím soubor…"), t("Vytvoření {path} vyžaduje oprávnění správce.", { path: target }), (opts) => api.files.createFile(selectedSessionId(), target, opts)); });
elements.mkdirButton.addEventListener("click", async () => { const name = await askName(t("Název nové složky:")); if (!name) return; const target = joinPath(state.currentPath, name); void mutate(t("Vytvářím složku…"), t("Vytvoření {path} vyžaduje oprávnění správce.", { path: target }), (opts) => api.files.mkdir(selectedSessionId(), target, opts)); });
elements.uploadButton.addEventListener("click", () => void uploadSelection());
elements.downloadButton.addEventListener("click", () => void downloadSelection()); elements.zipButton.addEventListener("click", () => archiveSelection("zip")); elements.tarGzButton.addEventListener("click", () => archiveSelection("tar.gz")); elements.tarButton.addEventListener("click", () => archiveSelection("tar"));
elements.filesBody.addEventListener("click", (event) => { const action = event.target.closest("button[data-row-action]"); if (action) { selectPath(action.dataset.path); if (action.dataset.rowAction === "open") void openSelection(); else showContextMenu(event, action.dataset.path); return; } const row = event.target.closest("tr[data-path]"); if (!row) return; selectPath(row.dataset.path, { toggle: event.metaKey || event.ctrlKey || event.target.matches("input[type=checkbox]"), range: event.shiftKey }); });
elements.filesBody.addEventListener("dblclick", (event) => { const row = event.target.closest("tr[data-path]"); if (!row) return; selectPath(row.dataset.path); void openSelection(); }); elements.filesBody.addEventListener("contextmenu", (event) => { const row = event.target.closest("tr[data-path]"); showContextMenu(event, row?.dataset.path); });
elements.contextMenu.addEventListener("click", (event) => { const action = event.target.closest("button[data-context]")?.dataset.context; hideContextMenu(); if (action === "open") void openSelection(); if (action === "download") void downloadSelection(); if (action === "rename") void renameSelection(); if (action === "remove") void removeSelection(); if (["zip", "tar", "tar.gz"].includes(action)) void archiveSelection(action); }); document.addEventListener("click", (event) => { if (!event.target.closest("#contextMenu") && !event.target.closest('[data-row-action="menu"]')) hideContextMenu(); });
elements.saveEditorButton.addEventListener("click", () => void saveEditor()); elements.closeEditorButton.addEventListener("click", closeEditor); elements.downloadEditorButton.addEventListener("click", () => { if (state.editorPath) void downloadSelection([state.editorPath]); });
elements.transfersToggle.addEventListener("click", () => setTransfersCollapsed(!elements.transfers.classList.contains("collapsed")));
elements.transferList.addEventListener("click", (event) => {
  const button = event.target.closest("button[data-transfer-action]");
  if (button) { void transferAction(button.dataset.transferAction, [button.dataset.id]); return; }
  const node = event.target.closest(".transfer"); if (!node) return;
  if (state.transferSelected.has(node.dataset.id)) state.transferSelected.delete(node.dataset.id); else state.transferSelected.add(node.dataset.id);
  queueTransferRender();
});
elements.pauseAllButton.addEventListener("click", () => void transferAction("pause", "all"));
elements.resumeAllButton.addEventListener("click", () => void transferAction("resume", sessionTransfers().filter((job) => job.actions.resume).map((job) => job.id)));
elements.cancelAllButton.addEventListener("click", () => void transferAction("cancel", "all"));
elements.pauseSelectedButton.addEventListener("click", () => void transferAction("pause", [...state.transferSelected]));
elements.resumeSelectedButton.addEventListener("click", () => void transferAction("resume", [...state.transferSelected]));
elements.cancelSelectedButton.addEventListener("click", () => void transferAction("cancel", [...state.transferSelected]));
elements.clearFinishedButton.addEventListener("click", () => void transferAction("remove", sessionTransfers().filter((job) => job.actions.remove).map((job) => job.id)));
for (const element of [elements.concurrencySelect, elements.autoRetryCheckbox, elements.verifyCheckbox]) element.addEventListener("change", () => {
  void api.files.transfers?.updateSettings({ maxConcurrent: Number(elements.concurrencySelect.value), autoRetry: elements.autoRetryCheckbox.checked, verify: elements.verifyCheckbox.checked }).catch((error) => setStatus(errorText(error), true));
});
window.__CHJ_HAS_UNSAVED_CHANGES__ = () => Boolean(state.editorPath && updateDirtyState());
window.addEventListener("keydown", (event) => { if (event.key === "Escape") { if (!elements.contextMenu.hidden) hideContextMenu(); else if (!elements.editor.hidden && !elements.sudoDialog.open) closeEditor(); return; } if (!elements.editor.hidden || event.target.matches("input,select,textarea") || elements.sudoDialog.open || elements.planDialog.open) return; if (event.key === "F5") { event.preventDefault(); void loadDirectory(state.currentPath); } if (event.key === "F2") { event.preventDefault(); void renameSelection(); } if (event.key === "Delete") { event.preventDefault(); void removeSelection(); } if (event.key === "Enter") { event.preventDefault(); void openSelection(); } if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === "a") { event.preventDefault(); state.selected = new Set(state.visibleEntries.map((entry) => entry.path)); renderEntries(); } if (event.key === "Backspace") { event.preventDefault(); void loadDirectory(parentPath(state.currentPath)); } });

(async () => {
  try { i18n.setLanguage(await api.ui.getLanguage()); } catch {}
  i18n.apply(document);
  api.ui.onLanguageChanged((language) => { i18n.setLanguage(language); i18n.apply(document); renderEntries(); queueTransferRender(); });
  const info = await api.getInfo(); elements.pluginVersion.textContent = `${info.name} v${info.version} · ${info.publisher}`;
  if (!api.files?.downloadArchive || !api.files?.downloadMany || !api.files?.createFile || !api.files?.removeMany) { for (const element of document.querySelectorAll("main button, main input, main select")) element.disabled = true; setStatus(t("Tento build modulu vyžaduje nový Core s rozšířeným files.* API. Nejdříve aktualizujte aplikaci."), true); return; }
  await initTransfers().catch((error) => setStatus(errorText(error), true));
  await loadSessions(); await loadDirectory("/");
})().catch((error) => setStatus(errorText(error), true));

setInterval(() => { if (!document.hidden) void loadSessions().catch(() => {}); }, 3000);