/**
 * Shared contract between main and renderer.
 * IPC channel names + payload types live here so both sides stay in sync.
 */

export const IpcChannels = {
  ytdlpVersion: 'ytdlp:version',
  probe: 'media:probe',
  downloadStart: 'download:start',
  downloadCancel: 'download:cancel',
  defaultFolder: 'download:default-folder',
  chooseFolder: 'download:choose-folder',
  openPath: 'shell:open-path',
  showInFolder: 'shell:show-in-folder',
  clipboardRead: 'clipboard:read',
  settingsGet: 'settings:get',
  settingsSet: 'settings:set',
  historyList: 'history:list',
  historyAdd: 'history:add',
  historyRemove: 'history:remove',
  historyRemoveMany: 'history:remove-many',
  historyClear: 'history:clear',
  /** main → renderer push channel for live download events */
  downloadEvent: 'download:event',
  cookiesLogin: 'cookies:login',
  cookiesStatus: 'cookies:status',
  cookiesClear: 'cookies:clear',
  templatesList: 'templates:list',
  templatesSave: 'templates:save',
  templatesRemove: 'templates:remove',
  commandPreview: 'command:preview',
  ytdlpUpdate: 'ytdlp:update',
  errorLogList: 'errorlog:list',
  errorLogClear: 'errorlog:clear',
  backupExport: 'backup:export',
  backupImport: 'backup:import',
  systemThemeGet: 'system-theme:get',
  /** main → renderer push channel for OS theme/contrast changes (nativeTheme 'updated') */
  systemThemeUpdate: 'system-theme:update',
  openHighContrastSettings: 'shell:open-high-contrast-settings',
  /** main → renderer push channel: a URL handed to AeroFetch from outside the app
   *  (the aerofetch:// protocol, or a .url file via Explorer's "Send to" menu) */
  externalUrl: 'external-url'
} as const

/** Sentinel format id meaning "let yt-dlp pick the best video+audio". */
export const BEST_FORMAT_ID = '__best__'

export type MediaKind = 'video' | 'audio'

// --- Post-processing / format options ---------------------------------------

/** Audio extraction target. 'best' keeps the source codec without re-encoding. */
export type AudioFormat = 'best' | 'mp3' | 'm4a' | 'opus' | 'flac' | 'wav' | 'aac'
export const AUDIO_FORMATS: AudioFormat[] = ['best', 'mp3', 'm4a', 'opus', 'flac', 'wav', 'aac']

/** Container the merged video is muxed into (`--merge-output-format`). */
export type VideoContainer = 'mp4' | 'mkv' | 'webm'
export const VIDEO_CONTAINERS: VideoContainer[] = ['mp4', 'mkv', 'webm']

/** Preferred video codec, applied as a `-S vcodec:…` sort tiebreaker. */
export type VideoCodecPref = 'any' | 'h264' | 'vp9' | 'av1'
export const VIDEO_CODECS: VideoCodecPref[] = ['any', 'h264', 'vp9', 'av1']

/** Whether SponsorBlock cuts the segments out or just marks them as chapters. */
export type SponsorBlockMode = 'remove' | 'mark'

/**
 * Where yt-dlp's auth cookies come from. 'browser' reads a logged-in browser's
 * cookie store directly; 'login' uses a cookie file exported from AeroFetch's
 * own built-in sign-in window (see src/main/cookies.ts).
 */
export type CookieSource = 'none' | 'browser' | 'login'

/** Browsers yt-dlp's --cookies-from-browser supports that ship on Windows. */
export const COOKIE_BROWSERS = ['chrome', 'edge', 'firefox', 'brave', 'opera', 'vivaldi'] as const
export type CookieBrowser = (typeof COOKIE_BROWSERS)[number]

/** Accent color presets for the brand ramp (see src/renderer/src/theme.ts). */
export const ACCENT_COLORS = ['toffee', 'slate', 'evergreen', 'lavender'] as const
export type AccentColor = (typeof ACCENT_COLORS)[number]

/** UI color theme: an explicit mode, or 'system' to follow the OS preference. */
export type ThemeMode = 'light' | 'dark' | 'system'

/** OS-level theme signal, read from Electron's nativeTheme in the main process. */
export interface SystemThemeInfo {
  /** whether Windows is currently in dark mode */
  shouldUseDarkColors: boolean
  /** whether a Windows high-contrast theme is active */
  shouldUseHighContrastColors: boolean
}

/** SponsorBlock segment categories (subset of yt-dlp's, the ones Seal exposes). */
export const SPONSORBLOCK_CATEGORIES = [
  'sponsor',
  'intro',
  'outro',
  'selfpromo',
  'preview',
  'filler',
  'interaction',
  'music_offtopic'
] as const
export type SponsorBlockCategory = (typeof SPONSORBLOCK_CATEGORIES)[number]

/**
 * Post-processing / format choices applied to a download. The persisted
 * defaults live in `Settings.downloadOptions`; an individual download may
 * override them via `StartDownloadOptions.options`.
 */
export interface DownloadOptions {
  /** audio extraction target (audio downloads only) */
  audioFormat: AudioFormat
  /** container for merged video downloads */
  videoContainer: VideoContainer
  /** preferred video codec (sort tiebreaker, not a hard filter) */
  preferredVideoCodec: VideoCodecPref
  /** download + embed subtitles into video */
  embedSubtitles: boolean
  /** comma-separated yt-dlp sub-lang selectors, e.g. 'en' or 'en.*,es' */
  subtitleLanguages: string
  /** also pull auto-generated (ASR) captions */
  autoSubtitles: boolean
  /** enable SponsorBlock */
  sponsorBlock: boolean
  sponsorBlockMode: SponsorBlockMode
  sponsorBlockCategories: SponsorBlockCategory[]
  /** embed chapter markers */
  embedChapters: boolean
  /** embed metadata (title/artist/etc.) */
  embedMetadata: boolean
  /** embed the thumbnail (cover art for audio, poster for mp4/mkv video) */
  embedThumbnail: boolean
  /** crop embedded audio artwork to a centred square (Seal's "crop artwork") */
  cropThumbnail: boolean
}

export const DEFAULT_DOWNLOAD_OPTIONS: DownloadOptions = {
  audioFormat: 'mp3',
  videoContainer: 'mp4',
  preferredVideoCodec: 'any',
  embedSubtitles: false,
  subtitleLanguages: 'en',
  autoSubtitles: false,
  sponsorBlock: false,
  sponsorBlockMode: 'remove',
  sponsorBlockCategories: ['sponsor'],
  embedChapters: false,
  embedMetadata: true,
  embedThumbnail: true,
  cropThumbnail: false
}

export interface YtdlpVersionResult {
  ok: boolean
  /** yt-dlp version string, present when ok is true */
  version?: string
  /** human-readable error, present when ok is false */
  error?: string
}

/** yt-dlp's self-update release channel (`--update-to <channel>`). */
export type YtdlpUpdateChannel = 'stable' | 'nightly'

export interface YtdlpUpdateResult {
  ok: boolean
  /** yt-dlp's own update output, e.g. "Updated to ... " or "yt-dlp is up to date" */
  output?: string
  error?: string
}

/** A single selectable output format, derived from `yt-dlp -J`. */
export interface FormatOption {
  /** yt-dlp format_id, or BEST_FORMAT_ID for the auto-best option */
  id: string
  /** human label, e.g. '1080p60 · mp4 · 124 MB' */
  label: string
  height?: number
  ext?: string
  filesizeLabel?: string
  /** true when this format already carries an audio track */
  hasAudio: boolean
}

/** Metadata + available formats returned by a probe. */
export interface MediaInfo {
  title: string
  channel?: string
  durationLabel?: string
  thumbnail?: string
  /** video format options, best-first (audio is transcoded, so not listed) */
  formats: FormatOption[]
}

/** One entry of a probed playlist (flat — no per-entry format list). */
export interface PlaylistEntry {
  /** 1-based position in the playlist */
  index: number
  id: string
  title: string
  /** canonical URL for the entry, enqueued as its own single-video download */
  url: string
  durationLabel?: string
  uploader?: string
}

/** A probed playlist: lightweight metadata for each entry. */
export interface PlaylistInfo {
  title: string
  uploader?: string
  count: number
  entries: PlaylistEntry[]
}

/**
 * A single probe can resolve to either one video (with formats) or a playlist
 * (with entries). `kind` discriminates which field is populated.
 */
export interface ProbeResult {
  ok: boolean
  kind?: 'video' | 'playlist'
  info?: MediaInfo
  playlist?: PlaylistInfo
  error?: string
}

/** Sent renderer → main to kick off a download. The renderer owns the id. */
export interface StartDownloadOptions {
  id: string
  url: string
  kind: MediaKind
  /** one of the UI quality labels (e.g. '1080p', 'Best (MP3)') */
  quality: string
  /** absolute output directory; main falls back to the OS Downloads folder */
  outputDir?: string
  /** exact yt-dlp format_id chosen from a probe; omit for the preset path */
  formatId?: string
  /** whether the chosen format already includes audio (skips +bestaudio) */
  formatHasAudio?: boolean
  /** per-download post-processing override; main falls back to settings defaults */
  options?: DownloadOptions
  /**
   * Per-download custom-command override: raw extra yt-dlp flags appended to
   * the generated argv (see CommandTemplate). Omit to fall back to the
   * persisted settings default (customCommandEnabled + defaultTemplateId);
   * pass an empty string to explicitly run with no extra args for just this
   * download even when the settings default is enabled.
   */
  extraArgs?: string
}

export interface StartDownloadResult {
  ok: boolean
  error?: string
}

export interface DownloadMeta {
  title?: string
  channel?: string
  durationLabel?: string
}

export interface DownloadProgress {
  /** yt-dlp progress status: 'downloading' | 'finished' | … */
  status: string
  /** 0..1 (0 when total size is unknown) */
  progress: number
  /** human-readable, e.g. '4.7 MB/s' */
  speed?: string
  /** human-readable, e.g. '1:12' */
  eta?: string
  /** human-readable total size, e.g. '512 MB' */
  sizeLabel?: string
}

/** Discriminated union pushed on IpcChannels.downloadEvent. */
export type DownloadEvent =
  | { type: 'meta'; id: string; meta: DownloadMeta }
  | { type: 'progress'; id: string; progress: DownloadProgress }
  | { type: 'done'; id: string; filePath?: string }
  | { type: 'error'; id: string; error: string }

/** Persisted user settings (electron-store). */
export interface Settings {
  /** absolute output directory (empty string resolves to the OS Downloads folder) */
  outputDir: string
  defaultKind: MediaKind
  defaultVideoQuality: string
  defaultAudioQuality: string
  /** how many downloads run at once */
  maxConcurrent: number
  /** yt-dlp output template, e.g. '%(title)s.%(ext)s' */
  filenameTemplate: string
  /** UI color theme: explicit light/dark, or 'system' to follow the OS */
  theme: ThemeMode
  /** brand accent preset (buttons, links, selected nav item) */
  accentColor: AccentColor
  /** auto-detect video links from the clipboard on window focus */
  clipboardWatch: boolean
  /** default post-processing / format options for new downloads */
  downloadOptions: DownloadOptions
  /** yt-dlp --proxy value, e.g. 'socks5://127.0.0.1:1080'. Empty disables it. */
  proxy: string
  /** yt-dlp --limit-rate value, e.g. '2M' or '500K'. Empty means unlimited. */
  rateLimit: string
  /** use bundled aria2c (resources/bin/aria2c.exe) as the external downloader */
  useAria2c: boolean
  /** where auth cookies come from: none, a browser's store, or the sign-in window */
  cookieSource: CookieSource
  /** which browser to read cookies from when cookieSource is 'browser' */
  cookiesBrowser: CookieBrowser
  /** sanitize output filenames to a portable ASCII-only subset (--restrict-filenames) */
  restrictFilenames: boolean
  /** record completed downloads in a yt-dlp --download-archive file to skip repeats */
  downloadArchive: boolean
  /** apply a named custom-command template's extra args to every new download */
  customCommandEnabled: boolean
  /** id of the CommandTemplate applied when customCommandEnabled is on; null = none picked yet */
  defaultTemplateId: string | null
  /** show a native OS notification when a download finishes or fails */
  notifyOnComplete: boolean
  /** false until the first-run welcome screen has been dismissed */
  hasCompletedOnboarding: boolean
}

/**
 * A named, reusable set of extra yt-dlp CLI flags (Phase C "custom commands"),
 * e.g. name: 'Write thumbnail + no mtime', args: '--write-thumbnail --no-mtime'.
 * Shell-split (see parseExtraArgs) and appended to the generated argv just
 * before the `--` URL terminator, so they can override earlier flags.
 */
export interface CommandTemplate {
  id: string
  name: string
  args: string
}

/** Result of building the exact yt-dlp command line for the current form state, without running it. */
export interface CommandPreviewResult {
  ok: boolean
  /** full command line (binary + quoted args), for display/copy only */
  command?: string
  error?: string
}

/** Whether the built-in sign-in window has ever saved a cookie file, and when. */
export interface CookiesStatus {
  exists: boolean
  /** epoch milliseconds the cookie file was last written */
  savedAt?: number
}

/** Result of a built-in sign-in window session, resolved once the window closes. */
export interface CookiesLoginResult {
  ok: boolean
  /** number of cookies captured into the exported file */
  cookieCount?: number
  error?: string
}

/** A completed download, persisted to history.json (newest-first). */
export interface HistoryEntry {
  id: string
  title: string
  channel?: string
  url: string
  kind: MediaKind
  quality: string
  filePath?: string
  sizeLabel?: string
  thumbnail?: string
  /** epoch milliseconds */
  completedAt: number
}

/**
 * A failed download or download-start attempt, persisted to errorlog.json
 * (newest-first) so the report survives the queue item being cleared —
 * Seal's "debug report" equivalent.
 */
export interface ErrorLogEntry {
  id: string
  /** resolved video title when known; falls back to the URL in the UI */
  title?: string
  url: string
  kind: MediaKind
  error: string
  /** epoch milliseconds */
  occurredAt: number
}

/** Result of exporting settings + custom-command templates to a JSON file. */
export interface BackupExportResult {
  ok: boolean
  /** absolute path written to, present when ok is true */
  path?: string
  error?: string
}

/** Result of restoring settings + custom-command templates from a JSON file. */
export interface BackupImportResult {
  ok: boolean
  error?: string
}