import {
  CSSResultGroup,
  html,
  LitElement,
  PropertyValues,
  TemplateResult,
  unsafeCSS,
} from 'lit';
import { customElement, property } from 'lit/decorators.js';
import { CameraEndpoints } from '../../camera-manager/types.js';
import { CameraConfig, MicrophoneConfig } from '../../config/types.js';
import { localize } from '../../localize/localize';
import liveGo2RTCStyle from '../../scss/live-go2rtc.scss';
import { ExtendedHomeAssistant, FrigateCardMediaPlayer } from '../../types.js';
import { getEndpointAddressOrDispatchError } from '../../utils/endpoint';
import { setControlsOnVideo } from '../../utils/media.js';
import { screenshotMedia } from '../../utils/screenshot.js';
import '../image.js';
import { dispatchErrorMessageEvent } from '../message';
import { VideoRTC } from './go2rtc/video-rtc';

customElements.define('frigate-card-live-go2rtc-player', VideoRTC);

// Note (2023-02-18): Depending on the behavior of the player / browser is
// possible this URL will need to be re-signed in order to avoid HA spamming
// logs after the expiry time, but this complexity is not added for now until
// there are verified cases of this being an issue (see equivalent in the JSMPEG
// provider).
const GO2RTC_URL_SIGN_EXPIRY_SECONDS = 24 * 60 * 60;

@customElement('frigate-card-live-go2rtc')
export class FrigateCardGo2RTC extends LitElement implements FrigateCardMediaPlayer {
  // Not an reactive property to avoid resetting the video.
  public hass?: ExtendedHomeAssistant;

  @property({ attribute: false })
  public cameraConfig?: CameraConfig;

  @property({ attribute: false })
  public cameraEndpoints?: CameraEndpoints;

  @property({ attribute: false })
  public microphoneStream?: MediaStream;

  @property({ attribute: false })
  public microphoneConfig?: MicrophoneConfig;

  @property({ attribute: true, type: Boolean })
  public controls = false;

  protected _player?: VideoRTC;

  public async play(): Promise<void> {
    return this._player?.video?.play();
  }

  public async pause(): Promise<void> {
    this._player?.video?.pause();
  }

  public async mute(): Promise<void> {
    if (this._player?.video) {
      this._player.video.muted = true;
    }
  }

  public async unmute(): Promise<void> {
    if (this._player?.video) {
      this._player.video.muted = false;
    }
  }

  public isMuted(): boolean {
    return this._player?.video?.muted ?? true;
  }

  public async seek(seconds: number): Promise<void> {
    if (this._player?.video) {
      this._player.video.currentTime = seconds;
    }
  }

  public async setControls(controls?: boolean): Promise<void> {
    if (this._player?.video) {
      setControlsOnVideo(this._player.video, controls ?? this.controls);
    }
  }

  public isPaused(): boolean {
    return this._player?.video?.paused ?? true;
  }

  public async getScreenshotURL(): Promise<string | null> {
    return this._player?.video ? screenshotMedia(this._player.video) : null;
  }

  disconnectedCallback(): void {
    this._player = undefined;
  }

  connectedCallback(): void {
    super.connectedCallback();

    // Reset the player when reconnected to the DOM.
    // https://github.com/dermotduffy/frigate-hass-card/issues/996
    this.requestUpdate();
  }

  protected async _createPlayer(): Promise<void> {
    if (!this.hass) {
      return;
    }

    const endpoint = this.cameraEndpoints?.go2rtc;
    if (!endpoint) {
      return dispatchErrorMessageEvent(this, localize('error.live_camera_no_endpoint'), {
        context: this.cameraConfig,
      });
    }

    const address = await getEndpointAddressOrDispatchError(
      this,
      this.hass,
      endpoint,
      GO2RTC_URL_SIGN_EXPIRY_SECONDS,
    );
    if (!address) {
      return;
    }

    this._player = new VideoRTC();
    this._player.containingPlayer = this;
    this._player.microphoneStream = this.microphoneStream ?? null;
    this._player.src = address;
    this._player.visibilityCheck = false;
    this._player.controls = this.controls;

    if (this.cameraConfig?.go2rtc?.modes && this.cameraConfig.go2rtc.modes.length) {
      this._player.mode = this.cameraConfig.go2rtc.modes.join(',');
    }

    this.requestUpdate();
  }

  protected willUpdate(changedProps: PropertyValues): void {
    if (!this._player || changedProps.has('cameraEndpoints')) {
      this._createPlayer();
    }

    if (changedProps.has('controls') && this._player) {
      this._player.controls = this.controls;
    }

    if (this._player && changedProps.has('microphoneStream')) {
      if (this._player?.microphoneStream !== this.microphoneStream) {
        this._player.microphoneStream = this.microphoneStream ?? null;

        // Need to force a reconnect if the microphone stream changes since
        // WebRTC cannot introduce a new stream after the offer is already made.
        this._player.reconnect();
      }
    }
  }

  protected render(): TemplateResult | void {
    return html`${this._player}`;
  }

  static get styles(): CSSResultGroup {
    return unsafeCSS(liveGo2RTCStyle);
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'frigate-card-live-go2rtc': FrigateCardGo2RTC;
  }
}