import type { TokenizerDepsRuntimeOptions } from '../../core/services/tokenizer';

type TokenizerMainDeps = TokenizerDepsRuntimeOptions & {
  getJlptEnabled: NonNullable<TokenizerDepsRuntimeOptions['getJlptEnabled']>;
  getFrequencyDictionaryEnabled: NonNullable<
    TokenizerDepsRuntimeOptions['getFrequencyDictionaryEnabled']
  >;
  getFrequencyDictionaryMatchMode: NonNullable<
    TokenizerDepsRuntimeOptions['getFrequencyDictionaryMatchMode']
  >;
  getFrequencyRank: NonNullable<TokenizerDepsRuntimeOptions['getFrequencyRank']>;
  getMinSentenceWordsForNPlusOne: NonNullable<
    TokenizerDepsRuntimeOptions['getMinSentenceWordsForNPlusOne']
  >;
  getYomitanGroupDebugEnabled: NonNullable<
    TokenizerDepsRuntimeOptions['getYomitanGroupDebugEnabled']
  >;
  recordLookup: (hit: boolean) => void;
};

export function createBuildTokenizerDepsMainHandler(deps: TokenizerMainDeps) {
  return (): TokenizerDepsRuntimeOptions => ({
    getYomitanExt: () => deps.getYomitanExt(),
    getYomitanParserWindow: () => deps.getYomitanParserWindow(),
    setYomitanParserWindow: (window) => deps.setYomitanParserWindow(window),
    getYomitanParserReadyPromise: () => deps.getYomitanParserReadyPromise(),
    setYomitanParserReadyPromise: (promise: Promise<void> | null) =>
      deps.setYomitanParserReadyPromise(promise),
    getYomitanParserInitPromise: () => deps.getYomitanParserInitPromise(),
    setYomitanParserInitPromise: (promise: Promise<boolean> | null) =>
      deps.setYomitanParserInitPromise(promise),
    isKnownWord: (text: string) => {
      const hit = deps.isKnownWord(text);
      deps.recordLookup(hit);
      return hit;
    },
    getKnownWordMatchMode: () => deps.getKnownWordMatchMode(),
    ...(deps.getNPlusOneEnabled
      ? {
          getNPlusOneEnabled: () => deps.getNPlusOneEnabled!(),
        }
      : {}),
    getMinSentenceWordsForNPlusOne: () => deps.getMinSentenceWordsForNPlusOne(),
    getJlptLevel: (text: string) => deps.getJlptLevel(text),
    getJlptEnabled: () => deps.getJlptEnabled(),
    getFrequencyDictionaryEnabled: () => deps.getFrequencyDictionaryEnabled(),
    getFrequencyDictionaryMatchMode: () => deps.getFrequencyDictionaryMatchMode(),
    getFrequencyRank: (text: string) => deps.getFrequencyRank(text),
    getYomitanGroupDebugEnabled: () => deps.getYomitanGroupDebugEnabled(),
    getMecabTokenizer: () => deps.getMecabTokenizer(),
  });
}

export function createCreateMecabTokenizerAndCheckMainHandler<TMecab>(deps: {
  getMecabTokenizer: () => TMecab | null;
  setMecabTokenizer: (tokenizer: TMecab) => void;
  createMecabTokenizer: () => TMecab;
  checkAvailability: (tokenizer: TMecab) => Promise<unknown>;
}) {
  return async (): Promise<void> => {
    let tokenizer = deps.getMecabTokenizer();
    if (!tokenizer) {
      tokenizer = deps.createMecabTokenizer();
      deps.setMecabTokenizer(tokenizer);
    }
    await deps.checkAvailability(tokenizer);
  };
}

export function createPrewarmSubtitleDictionariesMainHandler(deps: {
  ensureJlptDictionaryLookup: () => Promise<void>;
  ensureFrequencyDictionaryLookup: () => Promise<void>;
  showMpvOsd?: (message: string) => void;
  shouldShowOsdNotification?: () => boolean;
  setInterval?: (callback: () => void, delayMs: number) => unknown;
  clearInterval?: (timer: unknown) => void;
}) {
  let prewarmed = false;
  let prewarmPromise: Promise<void> | null = null;
  let loadingOsdDepth = 0;
  let loadingOsdFrame = 0;
  let loadingOsdTimer: unknown = null;
  const showMpvOsd = deps.showMpvOsd;
  const shouldShowOsdNotification = deps.shouldShowOsdNotification ?? (() => false);
  const setIntervalHandler =
    deps.setInterval ??
    ((callback: () => void, delayMs: number): unknown => setInterval(callback, delayMs));
  const clearIntervalHandler =
    deps.clearInterval ??
    ((timer: unknown): void => clearInterval(timer as ReturnType<typeof setInterval>));
  const spinnerFrames = ['|', '/', '-', '\\'];

  const beginLoadingOsd = (): boolean => {
    if (!showMpvOsd || !shouldShowOsdNotification()) {
      return false;
    }
    loadingOsdDepth += 1;
    if (loadingOsdDepth > 1) {
      return true;
    }

    loadingOsdFrame = 0;
    showMpvOsd(`Loading subtitle annotations ${spinnerFrames[loadingOsdFrame]}`);
    loadingOsdFrame += 1;
    loadingOsdTimer = setIntervalHandler(() => {
      if (!showMpvOsd) {
        return;
      }
      showMpvOsd(`Loading subtitle annotations ${spinnerFrames[loadingOsdFrame % spinnerFrames.length]}`);
      loadingOsdFrame += 1;
    }, 180);
    return true;
  };

  const endLoadingOsd = (): void => {
    if (!showMpvOsd) {
      return;
    }

    loadingOsdDepth = Math.max(0, loadingOsdDepth - 1);
    if (loadingOsdDepth > 0) {
      return;
    }

    if (loadingOsdTimer) {
      clearIntervalHandler(loadingOsdTimer);
      loadingOsdTimer = null;
    }
    showMpvOsd('Subtitle annotations loaded');
  };

  return async (options?: { showLoadingOsd?: boolean }): Promise<void> => {
    if (prewarmed) {
      return;
    }
    const shouldTrackLoadingOsd = options?.showLoadingOsd === true;
    const loadingOsdStarted = shouldTrackLoadingOsd ? beginLoadingOsd() : false;

    if (!prewarmPromise) {
      prewarmPromise = (async () => {
        try {
          await Promise.all([deps.ensureJlptDictionaryLookup(), deps.ensureFrequencyDictionaryLookup()]);
          prewarmed = true;
        } finally {
          prewarmPromise = null;
        }
      })();
    }
    try {
      await prewarmPromise;
    } finally {
      if (loadingOsdStarted) {
        endLoadingOsd();
      }
    }
  };
}