import { contextBridge, ipcRenderer, type IpcRendererEvent } from 'electron'
import {
  IpcChannels,
  type AppUpdateInfo,
  type AppUpdateDownload,
  type AppUpdateProgress,
  type YtdlpVersionResult,
  type YtdlpUpdateChannel,
  type YtdlpUpdateResult,
  type YtdlpAutoUpdateStatus,
  type FfmpegVersionResult,
  type ProbeResult,
  type StartDownloadOptions,
  type StartDownloadResult,
  type DownloadEvent,
  type Settings,
  type HistoryEntry,
  type CookiesStatus,
  type CookiesLoginResult,
  type CommandTemplate,
  type CommandPreviewResult,
  type ErrorLogEntry,
  type BackupExportResult,
  type BackupImportResult,
  type SystemThemeInfo,
  type Source,
  type MediaItem,
  type IndexProgress,
  type IndexSourceResult,
  type SyncResult,
  type ScheduledSyncStatus,
  type TerminalEvent,
  type TerminalRunResult,
  type TaskbarProgress
} from '@shared/ipc'

// The surface exposed to the renderer. Keep this thin: it only forwards to IPC.
const api = {
  /** AeroFetch's own version string (e.g. '0.3.1'). */
  getAppVersion: (): Promise<string> => ipcRenderer.invoke(IpcChannels.appVersion),

  /** Check the configured Gitea repo for a newer AeroFetch release. */
  checkForAppUpdate: (): Promise<AppUpdateInfo> => ipcRenderer.invoke(IpcChannels.appUpdateCheck),

  /** Download the latest release's installer to a temp file. */
  downloadAppUpdate: (url: string): Promise<AppUpdateDownload> =>
    ipcRenderer.invoke(IpcChannels.appUpdateDownload, url),

  /** Launch a downloaded installer and quit so it can replace the app. */
  runAppUpdate: (filePath: string): Promise<{ ok: boolean; error?: string }> =>
    ipcRenderer.invoke(IpcChannels.appUpdateRun, filePath),

  /** Subscribe to installer download progress. Returns an unsubscribe function. */
  onAppUpdateProgress: (cb: (p: AppUpdateProgress) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, p: AppUpdateProgress): void => cb(p)
    ipcRenderer.on(IpcChannels.appUpdateProgress, listener)
    return () => ipcRenderer.removeListener(IpcChannels.appUpdateProgress, listener)
  },

  getYtdlpVersion: (): Promise<YtdlpVersionResult> => ipcRenderer.invoke(IpcChannels.ytdlpVersion),

  /** Versions of the bundled ffmpeg + ffprobe (display-only; not auto-updated). */
  getFfmpegVersions: (): Promise<FfmpegVersionResult> =>
    ipcRenderer.invoke(IpcChannels.ffmpegVersion),

  probe: (url: string): Promise<ProbeResult> => ipcRenderer.invoke(IpcChannels.probe, url),

  startDownload: (opts: StartDownloadOptions): Promise<StartDownloadResult> =>
    ipcRenderer.invoke(IpcChannels.downloadStart, opts),

  cancelDownload: (id: string): Promise<void> => ipcRenderer.invoke(IpcChannels.downloadCancel, id),

  pauseDownload: (id: string): Promise<void> => ipcRenderer.invoke(IpcChannels.downloadPause, id),

  chooseFolder: (current?: string): Promise<string | null> =>
    ipcRenderer.invoke(IpcChannels.chooseFolder, current),

  openPath: (path: string): Promise<string> => ipcRenderer.invoke(IpcChannels.openPath, path),

  openUrl: (url: string): Promise<void> => ipcRenderer.invoke(IpcChannels.openUrl, url),

  showInFolder: (path: string): Promise<void> => ipcRenderer.invoke(IpcChannels.showInFolder, path),

  readClipboard: (): Promise<string> => ipcRenderer.invoke(IpcChannels.clipboardRead),

  getSettings: (): Promise<Settings> => ipcRenderer.invoke(IpcChannels.settingsGet),

  setSettings: (partial: Partial<Settings>): Promise<Settings> =>
    ipcRenderer.invoke(IpcChannels.settingsSet, partial),

  listHistory: (): Promise<HistoryEntry[]> => ipcRenderer.invoke(IpcChannels.historyList),

  addHistory: (entry: HistoryEntry): Promise<HistoryEntry[]> =>
    ipcRenderer.invoke(IpcChannels.historyAdd, entry),

  removeHistory: (id: string): Promise<HistoryEntry[]> =>
    ipcRenderer.invoke(IpcChannels.historyRemove, id),

  removeManyHistory: (ids: string[]): Promise<HistoryEntry[]> =>
    ipcRenderer.invoke(IpcChannels.historyRemoveMany, ids),

  clearHistory: (): Promise<HistoryEntry[]> => ipcRenderer.invoke(IpcChannels.historyClear),

  /** Open the built-in sign-in window; resolves once the user closes it. */
  cookiesLogin: (url: string): Promise<CookiesLoginResult> =>
    ipcRenderer.invoke(IpcChannels.cookiesLogin, url),

  cookiesStatus: (): Promise<CookiesStatus> => ipcRenderer.invoke(IpcChannels.cookiesStatus),

  cookiesClear: (): Promise<void> => ipcRenderer.invoke(IpcChannels.cookiesClear),

  listTemplates: (): Promise<CommandTemplate[]> => ipcRenderer.invoke(IpcChannels.templatesList),

  saveTemplate: (template: CommandTemplate): Promise<CommandTemplate[]> =>
    ipcRenderer.invoke(IpcChannels.templatesSave, template),

  removeTemplate: (id: string): Promise<CommandTemplate[]> =>
    ipcRenderer.invoke(IpcChannels.templatesRemove, id),

  /** Build the exact yt-dlp command line for the given form state, without running it. */
  previewCommand: (opts: StartDownloadOptions): Promise<CommandPreviewResult> =>
    ipcRenderer.invoke(IpcChannels.commandPreview, opts),

  updateYtdlp: (channel: YtdlpUpdateChannel): Promise<YtdlpUpdateResult> =>
    ipcRenderer.invoke(IpcChannels.ytdlpUpdate, channel),

  /** Subscribe to background yt-dlp auto-update status. Returns an unsubscribe function. */
  onYtdlpAutoUpdateStatus: (cb: (s: YtdlpAutoUpdateStatus) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, s: YtdlpAutoUpdateStatus): void => cb(s)
    ipcRenderer.on(IpcChannels.ytdlpAutoUpdateStatus, listener)
    return () => ipcRenderer.removeListener(IpcChannels.ytdlpAutoUpdateStatus, listener)
  },

  listErrorLog: (): Promise<ErrorLogEntry[]> => ipcRenderer.invoke(IpcChannels.errorLogList),

  clearErrorLog: (): Promise<ErrorLogEntry[]> => ipcRenderer.invoke(IpcChannels.errorLogClear),

  /** Opens a save dialog and writes settings + templates to the chosen JSON file. */
  exportBackup: (): Promise<BackupExportResult> => ipcRenderer.invoke(IpcChannels.backupExport),

  /** Opens an open dialog and restores settings + templates from the chosen JSON file. */
  importBackup: (): Promise<BackupImportResult> => ipcRenderer.invoke(IpcChannels.backupImport),

  /** Subscribe to live download events. Returns an unsubscribe function. */
  onDownloadEvent: (cb: (ev: DownloadEvent) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, ev: DownloadEvent): void => cb(ev)
    ipcRenderer.on(IpcChannels.downloadEvent, listener)
    return () => ipcRenderer.removeListener(IpcChannels.downloadEvent, listener)
  },

  getSystemTheme: (): Promise<SystemThemeInfo> => ipcRenderer.invoke(IpcChannels.systemThemeGet),

  /** Subscribe to OS theme/contrast changes. Returns an unsubscribe function. */
  onSystemThemeUpdate: (cb: (info: SystemThemeInfo) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, info: SystemThemeInfo): void => cb(info)
    ipcRenderer.on(IpcChannels.systemThemeUpdate, listener)
    return () => ipcRenderer.removeListener(IpcChannels.systemThemeUpdate, listener)
  },

  /** Opens Windows' "Contrast themes" accessibility settings page. */
  openHighContrastSettings: (): Promise<void> =>
    ipcRenderer.invoke(IpcChannels.openHighContrastSettings),

  /** Subscribe to links handed to AeroFetch from outside (aerofetch:// or a
   *  "Send to" .url file). Returns an unsubscribe function. */
  onExternalUrl: (cb: (url: string) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, url: string): void => cb(url)
    ipcRenderer.on(IpcChannels.externalUrl, listener)
    return () => ipcRenderer.removeListener(IpcChannels.externalUrl, listener)
  },

  // --- Media-manager sources (Pinchflat-style; see ROADMAP-PINCHFLAT.md) ---

  listSources: (): Promise<Source[]> => ipcRenderer.invoke(IpcChannels.sourcesList),

  /** Index (or re-index) a channel/playlist URL into the persisted source list. */
  indexSource: (url: string): Promise<IndexSourceResult> =>
    ipcRenderer.invoke(IpcChannels.sourceIndex, url),

  /** Re-index an existing source by id (refreshes its media-item list). */
  reindexSource: (id: string): Promise<IndexSourceResult> =>
    ipcRenderer.invoke(IpcChannels.sourceReindex, id),

  removeSource: (id: string): Promise<Source[]> => ipcRenderer.invoke(IpcChannels.sourceRemove, id),

  listSourceItems: (sourceId: string): Promise<MediaItem[]> =>
    ipcRenderer.invoke(IpcChannels.sourceItems, sourceId),

  /** Persist that a media item has finished downloading (drives incremental sync). */
  markSourceItemDownloaded: (id: string, filePath?: string): Promise<MediaItem[]> =>
    ipcRenderer.invoke(IpcChannels.sourceItemDownloaded, id, filePath),

  /** Toggle whether a source is watched for new uploads. */
  setSourceWatched: (id: string, watched: boolean): Promise<Source[]> =>
    ipcRenderer.invoke(IpcChannels.sourceSetWatched, id, watched),

  /** Re-index all watched sources; resolves with the videos found new. */
  syncSources: (): Promise<SyncResult> => ipcRenderer.invoke(IpcChannels.sourcesSync),

  /** Read / write the Windows daily-sync scheduled task. */
  getScheduledSync: (): Promise<ScheduledSyncStatus> =>
    ipcRenderer.invoke(IpcChannels.scheduledSyncGet),
  setScheduledSync: (enabled: boolean): Promise<ScheduledSyncStatus> =>
    ipcRenderer.invoke(IpcChannels.scheduledSyncSet, enabled),

  /** Subscribe to live indexing progress. Returns an unsubscribe function. */
  onIndexProgress: (cb: (p: IndexProgress) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, p: IndexProgress): void => cb(p)
    ipcRenderer.on(IpcChannels.indexProgress, listener)
    return () => ipcRenderer.removeListener(IpcChannels.indexProgress, listener)
  },

  // --- Built-in yt-dlp terminal (Phase N) ---

  /** Run the bundled yt-dlp with raw args; output streams via onTerminalOutput. */
  runTerminal: (id: string, args: string): Promise<TerminalRunResult> =>
    ipcRenderer.invoke(IpcChannels.terminalRun, id, args),

  cancelTerminal: (id: string): Promise<void> => ipcRenderer.invoke(IpcChannels.terminalCancel, id),

  /** Subscribe to live terminal output. Returns an unsubscribe function. */
  onTerminalOutput: (cb: (ev: TerminalEvent) => void): (() => void) => {
    const listener = (_e: IpcRendererEvent, ev: TerminalEvent): void => cb(ev)
    ipcRenderer.on(IpcChannels.terminalOutput, listener)
    return () => ipcRenderer.removeListener(IpcChannels.terminalOutput, listener)
  },

  /** Reflect overall queue progress on the Windows taskbar. */
  setTaskbarProgress: (p: TaskbarProgress): Promise<void> =>
    ipcRenderer.invoke(IpcChannels.taskbarProgress, p),

  /** Open a YouTube WebView to automatically extract a PO token (Phase P). */
  mintPoToken: (): Promise<string | null> =>
    ipcRenderer.invoke(IpcChannels.youtubePoTokenMint) as Promise<string | null>
}

export type Api = typeof api

// A minimal presence marker. The renderer only checks `window.electron` for
// truthiness to tell the real app apart from the browser UI preview, so there's
// no reason to expose the full ipcRenderer/webFrame/process surface here.
const electron = { isElectron: true } as const
export type ElectronMarker = typeof electron

if (process.contextIsolated) {
  try {
    contextBridge.exposeInMainWorld('electron', electron)
    contextBridge.exposeInMainWorld('api', api)
  } catch (error) {
    // M30: a broken bridge causes the renderer to silently run in preview/mock mode.
    // Notify the main process so it can show a hard error dialog — without this the
    // failure is completely invisible to the user.
    console.error('[AeroFetch preload] contextBridge failed:', error)
    try {
      ipcRenderer.send(IpcChannels.preloadBridgeFailure, String(error))
    } catch {
      /* if IPC itself is broken there is nothing more we can do */
    }
  }
} else {
  // @ts-ignore window.electron is declared in index.d.ts
  window.electron = electron
  // @ts-ignore window.api is declared in index.d.ts
  window.api = api
}