import type { PlayerSubtitleStyle } from './subtitle-style.util';
import type { RecordingStartMetadata } from './recording-metadata.interface';

export type EmbeddedMpvSessionStatus =
    'idle' | 'loading' | 'playing' | 'paused' | 'ended' | 'error' | 'closed';

export interface EmbeddedMpvBounds {
    x: number;
    y: number;
    width: number;
    height: number;
}

export interface EmbeddedMpvCapabilities {
    subtitles: boolean;
    playbackSpeed: boolean;
    aspectOverride: boolean;
    screenshot: boolean;
    recording: boolean;
    /** Loading an external subtitle file via `sub-add` (frame-copy engine). */
    externalSubtitles?: boolean;
    /** Adjusting `sub-delay` at runtime (frame-copy engine). */
    subtitleDelay?: boolean;
    /** Adjusting `sub-scale`/`sub-color` at runtime (frame-copy engine). */
    subtitleStyle?: boolean;
}

/**
 * Subtitle presentation preferences forwarded to mpv: `sizePercent` maps to
 * `sub-scale` (100 = 1.0); `color` maps to `sub-color`, null restores mpv's
 * default. Alias of the canonical shared shape so the renderer controls and
 * the IPC contract cannot drift structurally.
 */
export type EmbeddedMpvSubtitleStyle = PlayerSubtitleStyle;

export type EmbeddedMpvEngine = 'native' | 'frame-copy';

export interface EmbeddedMpvSupport {
    supported: boolean;
    platform: string;
    reason?: string;
    capabilities?: EmbeddedMpvCapabilities;
    /**
     * Rendering engine the main process will use for new sessions.
     * `native` = platform video surface (NSOpenGLView/HWND/X11 wid),
     * `frame-copy` = helper process + shm ring + renderer canvas.
     */
    engine?: EmbeddedMpvEngine;
    /**
     * True when this machine could run the frame-copy engine (macOS arm64
     * or Linux x64, after its helper/runtime capability gate), regardless of
     * whether it is active.
     * Drives the Settings toggle; switching engines requires an app restart.
     */
    frameCopyAvailable?: boolean;
    /**
     * Stable fail-closed capability reason when frameCopyAvailable is false.
     * Intended for startup tracing and support diagnostics, not user copy.
     */
    frameCopyUnavailableReason?: string;
}

/**
 * Where the renderer's frame pump finds the current shm frame ring of a
 * frame-copy session. A new generation is announced after every viewport
 * resize; the pump re-attaches to the new segment.
 */
export interface EmbeddedMpvFrameSource {
    shmName: string;
    width: number;
    height: number;
    generation: number;
    readerPath: string;
}

export interface EmbeddedMpvAudioTrack {
    id: number;
    title?: string;
    language?: string;
    selected: boolean;
    defaultTrack?: boolean;
    forced?: boolean;
}

export type EmbeddedMpvSubtitleTrack = EmbeddedMpvAudioTrack;

export interface EmbeddedMpvRecordingState {
    active: boolean;
    targetPath?: string;
    startedAt?: string;
    error?: string;
}

/**
 * Live stream diagnostics mpv reports for the player's info popover. Every
 * field is optional: a property mpv has not answered yet (or an engine that
 * does not observe it) simply omits its row rather than reporting a zero.
 */
export interface EmbeddedMpvStreamStats {
    /** mpv `estimated-vf-fps` — the measured, not the container, rate. */
    fps?: number;
    /** mpv `video-bitrate` / `audio-bitrate`, in bits per second. */
    videoBitrateBps?: number;
    audioBitrateBps?: number;
    /** mpv `video-format` / `audio-codec-name`, e.g. `h264` / `aac`. */
    videoCodec?: string;
    audioCodec?: string;
    /** mpv `audio-params/channels`, e.g. `stereo` or `5.1`. */
    audioChannels?: string;
    /** mpv `audio-params/samplerate`, in Hz. */
    audioSampleRateHz?: number;
    /** mpv `file-format`, e.g. `mpegts` or `hls`. */
    container?: string;
    /** mpv `demuxer-cache-duration`: media buffered ahead, in seconds. */
    bufferedAheadSeconds?: number;
    /** mpv `frame-drop-count` plus `decoder-frame-drop-count`. */
    droppedFrames?: number;
}

export interface EmbeddedMpvRecordingStartOptions {
    directory?: string;
    title?: string;
    /**
     * Channel/EPG snapshot captured by the live host at recording start; the
     * main-process recording tracker persists it. See
     * recording-metadata.interface.ts for why capture must happen up front.
     */
    metadata?: RecordingStartMetadata;
}

export interface EmbeddedMpvSession {
    id: string;
    title: string;
    streamUrl: string;
    status: EmbeddedMpvSessionStatus;
    positionSeconds: number;
    durationSeconds: number | null;
    volume: number;
    audioTracks: EmbeddedMpvAudioTrack[];
    selectedAudioTrackId: number | null;
    subtitleTracks: EmbeddedMpvSubtitleTrack[];
    selectedSubtitleTrackId: number | null;
    playbackSpeed: number;
    aspectOverride: string;
    /** Source video size (mpv dwidth/dheight); frame-copy engine only. */
    videoWidth?: number;
    videoHeight?: number;
    /** Live diagnostics for the info popover; absent when mpv reports none. */
    stats?: EmbeddedMpvStreamStats;
    recording?: EmbeddedMpvRecordingState;
    startedAt: string;
    updatedAt: string;
    error?: string;
    /**
     * Present while the main process is waiting to reload a dropped stream
     * or has such a reload in flight; absent once playback is back or the
     * attempts are exhausted. Display only — the renderer never schedules.
     */
    reconnect?: EmbeddedMpvReconnectInfo;
}

/** Progress of the main-process automatic reconnect for one session. */
export interface EmbeddedMpvReconnectInfo {
    /** 1-based number of the attempt that is scheduled or in flight. */
    attempt: number;
    maxAttempts: number;
    /** ISO timestamp at which the scheduled attempt fires. */
    nextAttemptAt: string;
}