/// <reference path="../audio.ts" />
/// <reference path="../kana.ts" />
/// <reference path="../level.ts" />
/// <reference path="../display.ts" />
/// <reference path="common.ts" />

namespace game {
  import Level = level.Level;

  class TypingScreenContext {
    track: audio.Track | null = null;

    constructor(
      readonly context: GameContext,
      readonly level: Level,
      readonly switchClosure: (screen: Screen | null) => void
    ) {}

    get container() {
      return this.context.container;
    }

    get audioManager() {
      return this.context.audioManager;
    }

    get bgManager() {
      return this.context.bgManager;
    }

    switchScreen(screen: Screen | null): void {
      this.switchClosure(screen);
    }
  }

  export class TypingScreen extends ScreenManager implements Screen {
    readonly name: string = 'game';

    constructor(
      readonly context: GameContext,
      readonly level: Level,
      readonly prevScreen: Screen
    ) {
      super(context.container);
    }

    enter(): void {
      if (this.level.background) {
        this.context.bgManager.setBackground(this.level.background);
      }
      let context = new TypingScreenContext(this.context, this.level, (screen) => this.switchScreen(screen));
      let loadingScreen = new TypingLoadingScreen(context);
      this.switchScreen(loadingScreen);
    }

    handleInput(key: string): void {
      if (this.activeScreen !== null) {
        this.activeScreen.handleInput(key);
      }
    }

    switchScreen(screen: Screen | null): void {
      super.switchScreen(screen);
      if (screen == null) {
        this.context.switchScreen(this.prevScreen);
      }
    }

    exit(): void {}

    transitionExit(): void {}
  }

  class TypingLoadingScreen implements Screen {
    readonly name: string = 'game-loading';
    barElement: HTMLElement | null = null;
    textElement: HTMLElement | null = null;
    readyElement: HTMLElement | null = null;
    isReady: boolean = false;
    fnContext: util.FnContext = new util.FnContext();

    constructor(readonly context: TypingScreenContext) {}

    enter(): void {
      let loader: HTMLElement = util.getElement(this.context.container, '#loader');
      this.readyElement = util.getElement(this.context.container, '#ready');
      if (this.context.level.audio != null) {
        loader.style.visibility = 'visible';
        this.barElement = util.getElement(loader, '.progress-bar .shade');
        this.textElement = util.getElement(loader, '.label');

        this.barElement.style.width = '0%';
        this.textElement.textContent = 'music loading';
        this.readyElement.querySelector('.status')!.textContent = 'Loading';
        this.readyElement.querySelector('.message')!.textContent = 'please wait';

        this.fnContext.invalidate();

        const videoId = youtube.getVideoId(this.context.level.audio);
        const progressListener = this.fnContext.wrap((percentage: number) => {
          this.barElement!.style.width = `${percentage}%`;
        });
        let trackPromise;
        if (videoId !== null) {
          const ytElement = document.createElement('div');
          trackPromise = this.context.audioManager.loadTrackFromYoutube(
            videoId,
            ytElement,
            progressListener,
          );
          this.context.bgManager.setVideo(ytElement);
          if (this.context.level.background == undefined) {
            trackPromise.then((track) => {
              track.playPromise.then(track.fnContext.wrap(() => {
                this.context.bgManager.showVideo();
              }));
              track.finishPromise.then(track.fnContext.wrap(() => {
                this.context.bgManager.hideVideo();
              }));
            });
          }
        } else {
          trackPromise = this.context.audioManager.loadTrackWithProgress(
            this.context.level.audio,
            progressListener,
          )
        }
        trackPromise.then(this.fnContext.wrap((track: audio.Track) => {
          this.context.track = track;
          this.barElement!.style.width = '100%';
          this.textElement!.textContent = 'music loaded';
          this.setReady();
        }));
      } else {
        loader.style.visibility = 'hidden';
        this.setReady();
      }
    }

    setReady(): void {
      this.readyElement!.querySelector('.status')!.textContent = 'Ready';
      this.readyElement!.querySelector('.message')!.textContent = 'press space to start';
      this.isReady = true;
    }

    handleInput(key: string): void {
      if (key == 'Escape') {
        this.context.switchScreen(null);
      } else if (this.isReady && key === ' ') {
        this.context.switchScreen(new TypingPlayingScreen(this.context));
      }
    }

    exit(): void {
      this.fnContext.invalidate();
    }

    transitionExit(): void {
      if (this.barElement) {
        this.barElement.style.width = '0%';
      }
    }
  }

  class TypingPlayingScreen implements Screen {
    readonly name: string = 'game-playing';
    gameContainer: HTMLElement;
    currentIndex: number;
    inputState: kana.KanaInputState | null;
    isWaiting: boolean;
    kanjiElement: HTMLElement;
    kanaController: display.KanaDisplayController;
    romajiController: display.RomajiDisplayController;
    progressController: display.TrackProgressController | null;
    scoreController: display.ScoreController;
    lines: level.Line[];

    constructor(readonly context: TypingScreenContext) {
      this.gameContainer = util.getElement(this.context.container, '#game');
      this.currentIndex = -1;
      this.inputState = null;
      this.isWaiting = false;
      this.kanjiElement = util.getElement(this.gameContainer, '.kanji-line');
      this.romajiController = new display.RomajiDisplayController(
        util.getElement(this.gameContainer, '.romaji-first'),
        util.getElement(this.gameContainer, '.romaji-line')
      );
      this.kanaController = new display.KanaDisplayController(
        util.getElement(this.gameContainer, '.kana-line')
      );
      this.progressController = null;
      this.scoreController = new display.ScoreController(
        util.getElement(this.gameContainer, '.score-line'),
        util.getElement(this.gameContainer, '.stats-line')
      );
      this.lines = this.context.level.lines;
    }

    enter(): void {
      let progressElement: HTMLElement = this.gameContainer.querySelector<HTMLElement>('.track-progress')!;
      if (this.context.level.audio == null) {
        progressElement.style.visibility = 'hidden';
        this.lines = this.context.level.lines.filter(line => line.kana != "@");
      } else {
        progressElement.style.visibility = 'visible';
        this.progressController = new display.TrackProgressController(
          progressElement,
          this.lines
        );
        this.progressController.setListener(event => this.onIntervalEnd());
      }
      this.onStart();
    }

    setWaiting(waiting: boolean): void {
      this.gameContainer.classList.toggle('waiting', waiting);
      this.isWaiting = waiting;
    }

    onStart(): void {
      this.nextLine();
      if (this.context.track !== null) {
        this.progressController!.start();
        this.context.track.play();
      }

      this.setWaiting(false);
      this.checkComplete();
    }

    checkComplete(): void {
      let currentLine = this.lines[this.currentIndex];
      if (currentLine != null && currentLine.kana == '@' && currentLine.kanji == '@') {
        this.onComplete(true);
      }
    }

    onIntervalEnd(): void {
      if (this.isWaiting) {
        this.setWaiting(false);
      } else {
        this.nextLine();
        this.scoreController.intervalEnd(false);
      }
      if (this.currentIndex >= this.lines.length) {
        this.finish();
      }
      this.checkComplete();
    }

    onComplete(autoComplete: boolean = false): void {
      this.nextLine();
      if (!autoComplete) {
        this.scoreController.intervalEnd(true);
      }
      if (this.context.track !== null) {
        this.setWaiting(true);
      } else {
        if (this.currentIndex >= this.lines.length) {
          this.finish();
        }
      }
    }

    handleInput(key: string): void {
      if (key === 'Escape') {
        this.finish();
      } else if (!this.isWaiting) {
        if (this.inputState !== null && /^[-_ a-z]$/.test(key)) {
          if (this.inputState.handleInput(key)) {
            this.onComplete();
          }
        }
      }
    }

    nextLine(): void {
      if (this.currentIndex < this.lines.length) {
        this.currentIndex += 1;
      }
      if (this.currentIndex < this.lines.length) {
        this.setLine(this.lines[this.currentIndex]);
      } else {
        this.setLine({ kanji: '@', kana: '@' });
      }
    }

    setLine(line: level.Line): void {
      let kanji, inputState;
      if (line.kanji === '@') {
        kanji = '';
      } else {
        kanji = line.kanji;
      }

      if (line.kana === '@') {
        inputState = null;
      } else {
        inputState = new kana.KanaInputState(line.kana);
      }

      this.inputState = inputState;
      this.kanjiElement.textContent = kanji;
      this.kanaController.setInputState(this.inputState);
      this.romajiController.setInputState(this.inputState);
      this.scoreController.setInputState(this.inputState);
    }

    finish(): void {
      this.context.switchScreen(new TypingFinishScreen(
        this.context,
        this.scoreController.score
      ));
    }

    exit(): void {}

    transitionExit(): void {
      this.kanaController.destroy();
      this.romajiController.destroy();
      if (this.context.track !== null) {
        this.progressController!.destroy();
      }
      this.scoreController.destroy();
    }
  }

  class TypingFinishScreen implements Screen {
    name: string = 'game-finished';

    constructor(
      readonly context: TypingScreenContext,
      readonly score: display.Score
    ) {
      let container = this.context.container.querySelector('#score')!;
      container.querySelector('.score')!.textContent = this.score.score+'';
      container.querySelector('.max-combo')!.textContent = this.score.maxCombo+'';
      container.querySelector('.finished')!.textContent = this.score.finished+'';
      container.querySelector('.hit')!.textContent = this.score.hit+'';
      container.querySelector('.missed')!.textContent = this.score.missed+'';
      container.querySelector('.skipped')!.textContent = this.score.skipped+'';
    }

    enter(): void {}

    handleInput(key: string): void {
      if (key === ' ' || key === 'Escape') {
        this.context.switchScreen(null);
      }
    }

    exit(): void {
      if (this.context.track !== null) {
        this.context.track.exit();
      }
    }

    transitionExit(): void {}
  }
}