import { contextBridge, ipcRenderer } from 'electron'
import { IPC } from '@shared/ipc'
import type {
  AppState,
  Challenge,
  Exercise,
  GameId,
  GameStatus,
  HistoryEntry,
  MatchSummary,
  Settings,
  Tick,
  UpdaterStatus
} from '@shared/types'

type Unsub = () => void
type Handler<T> = (payload: T) => void

function on<T>(channel: string, handler: Handler<T>): Unsub {
  const listener = (_e: Electron.IpcRendererEvent, payload: T): void =>
    handler(payload)
  ipcRenderer.on(channel, listener)
  return () => ipcRenderer.removeListener(channel, listener)
}

const api = {
  getState: (): Promise<AppState> => ipcRenderer.invoke(IPC.getState),

  addExercise: (
    input: Omit<Exercise, 'id' | 'nextFireAt' | 'lastDoneAt'>
  ): Promise<Exercise> => ipcRenderer.invoke(IPC.addExercise, input),
  updateExercise: (id: string, patch: Partial<Exercise>): Promise<Exercise> =>
    ipcRenderer.invoke(IPC.updateExercise, id, patch),
  deleteExercise: (id: string): Promise<boolean> =>
    ipcRenderer.invoke(IPC.deleteExercise, id),
  toggleExercise: (id: string, enabled: boolean): Promise<Exercise> =>
    ipcRenderer.invoke(IPC.toggleExercise, id, enabled),
  markDone: (id: string, actualReps?: number): Promise<Exercise> =>
    ipcRenderer.invoke(IPC.markDone, id, actualReps),
  snooze: (id: string, minutes: number): Promise<Exercise> =>
    ipcRenderer.invoke(IPC.snooze, id, minutes),
  skip: (id: string): Promise<Exercise> => ipcRenderer.invoke(IPC.skip, id),

  updateSettings: (patch: Partial<Settings>): Promise<Settings> =>
    ipcRenderer.invoke(IPC.updateSettings, patch),

  getAccentColor: (): Promise<string> => ipcRenderer.invoke(IPC.getAccentColor),
  getOsTheme: (): Promise<'light' | 'dark'> =>
    ipcRenderer.invoke(IPC.getOsTheme),
  getAppVersion: (): Promise<string> => ipcRenderer.invoke(IPC.getAppVersion),
  getMeetingActive: (): Promise<boolean> =>
    ipcRenderer.invoke(IPC.getMeetingActive),

  pauseAll: (): Promise<void> => ipcRenderer.invoke(IPC.pauseAll),
  resumeAll: (): Promise<void> => ipcRenderer.invoke(IPC.resumeAll),
  quit: (): Promise<void> => ipcRenderer.invoke(IPC.quit),
  reminderClose: (): Promise<void> => ipcRenderer.invoke(IPC.reminderClose),

  minimizeMain: (): void => ipcRenderer.send(IPC.minimizeMain),
  toggleMaximizeMain: (): void => ipcRenderer.send(IPC.toggleMaximizeMain),
  isMaximizedMain: (): Promise<boolean> =>
    ipcRenderer.invoke(IPC.isMaximizedMain),
  closeMain: (): void => ipcRenderer.send(IPC.closeMain),
  hideMain: (): void => ipcRenderer.send(IPC.hideMain),

  // Games
  listGames: (): Promise<GameStatus[]> => ipcRenderer.invoke(IPC.gamesList),
  installGame: (id: GameId): Promise<GameStatus> =>
    ipcRenderer.invoke(IPC.gameInstall, id),
  uninstallGame: (id: GameId): Promise<GameStatus> =>
    ipcRenderer.invoke(IPC.gameUninstall, id),
  toggleGame: (id: GameId, enabled: boolean): Promise<void> =>
    ipcRenderer.invoke(IPC.gameToggle, id, enabled),
  openGameLaunchOptions: (id: GameId): Promise<void> =>
    ipcRenderer.invoke(IPC.gameOpenLaunchOptions, id),

  // Challenges
  addChallenge: (input: Omit<Challenge, 'id'>): Promise<Challenge> =>
    ipcRenderer.invoke(IPC.addChallenge, input),
  updateChallenge: (
    id: string,
    patch: Partial<Challenge>
  ): Promise<Challenge> => ipcRenderer.invoke(IPC.updateChallenge, id, patch),
  deleteChallenge: (id: string): Promise<boolean> =>
    ipcRenderer.invoke(IPC.deleteChallenge, id),
  toggleChallenge: (id: string, enabled: boolean): Promise<Challenge> =>
    ipcRenderer.invoke(IPC.toggleChallenge, id, enabled),
  markChallengeDone: (id: string, reps: number): Promise<boolean> =>
    ipcRenderer.invoke(IPC.markChallengeDone, id, reps),

  closeMatchSummary: (): Promise<void> =>
    ipcRenderer.invoke(IPC.closeMatchSummary),

  // Dev-only: synthesize a match-end event from the renderer. The channel is
  // not registered in production builds (see src/main/ipc.ts), so this
  // function will reject in shipped binaries even though it's exposed.
  // Gated at the preload level too so the bundler can dead-code-eliminate it.
  ...(import.meta.env.MODE !== 'production'
    ? {
        simulateMatchEnd: (
          id: GameId,
          stats: Record<string, number>
        ): Promise<void> =>
          ipcRenderer.invoke(IPC.devSimulateMatchEnd, id, stats)
      }
    : {}),

  // Auto-updater
  updaterStatus: (): Promise<UpdaterStatus> =>
    ipcRenderer.invoke(IPC.updaterStatus),
  updaterCheck: (): Promise<UpdaterStatus> =>
    ipcRenderer.invoke(IPC.updaterCheck),
  // Fire-and-forget. Прогресс и завершение прилетают через onUpdaterStatus —
  // renderer не должен `await`'ить, иначе busy-state висит весь download.
  updaterDownload: (): void => ipcRenderer.send(IPC.updaterDownload),
  updaterInstall: (): void => ipcRenderer.send(IPC.updaterInstall),

  // History
  getHistory: (sinceMs?: number): Promise<HistoryEntry[]> =>
    ipcRenderer.invoke(IPC.getHistory, sinceMs),
  clearHistory: (beforeTs?: number): Promise<number> =>
    ipcRenderer.invoke(IPC.clearHistory, beforeTs),

  // Export / Import — открывают native save/open dialogs из main process.
  exportState: (): Promise<{
    ok: boolean
    canceled: boolean
    path: string | null
    error?: string
  }> => ipcRenderer.invoke(IPC.exportState),
  importState: (): Promise<{
    ok: boolean
    canceled: boolean
    error?: string
  }> => ipcRenderer.invoke(IPC.importState),

  onTick: (h: Handler<Tick[]>): Unsub => on(IPC.evtTick, h),
  onFire: (h: Handler<Exercise>): Unsub => on(IPC.evtFire, h),
  onMatchEnd: (h: Handler<MatchSummary>): Unsub => on(IPC.evtMatchEnd, h),
  onStateChanged: (h: Handler<AppState>): Unsub => on(IPC.evtStateChanged, h),
  onThemeChanged: (h: Handler<'light' | 'dark'>): Unsub =>
    on(IPC.evtThemeChanged, h),
  onAccentChanged: (h: Handler<string>): Unsub => on(IPC.evtAccentChanged, h),
  onGamesChanged: (h: Handler<GameStatus[]>): Unsub =>
    on(IPC.evtGamesChanged, h),
  onUpdaterStatus: (h: Handler<UpdaterStatus>): Unsub =>
    on(IPC.evtUpdaterStatus, h),
  onMaximizeChanged: (h: Handler<boolean>): Unsub =>
    on(IPC.evtMaximizeChanged, h),
  onMeetingChanged: (h: Handler<boolean>): Unsub =>
    on(IPC.evtMeetingChanged, h),
  onHistoryChanged: (h: Handler<void>): Unsub =>
    on(IPC.evtHistoryChanged, h)
}

contextBridge.exposeInMainWorld('api', api)

export type Api = typeof api