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import { SearchSentenceResult } from "../search/types.ts";
import APIBase from "./base.ts";
import { JapaneseFormatter } from "./japanese.ts";
import Word from "./word.ts";

export default class Sentence extends APIBase {
  public words: Array<Word> = [];
	protected query?: SearchSentenceResult;
	protected original: string = "";
  protected breaks: Array<number> = [];
  protected frozen = false;

	public ready: Promise<void>;
	private _resolveReady: () => void = () => {};

  constructor(input: string) {
    super();
    this.original = input;
    this.update();
  }

  first(searchValue: RegExp | string): Word | undefined {
    return this.words[0]; // TODO: implement
  }

	private async fetch() {
		this.query = await (await this.api)["core"].search.sentence(this.original, { breaks: this.breaks });
	}

	private async updateWords() {
		this.words.clear();
		let token = 0;
		let i = 0;
		while (i < this.original.length) {
			this.words.push(new Word(this.query!.words[token]).withParent(await this.api));

			i += this.query!.words[token].source.length;
			if (i == this.original.length) break;
			token++;

			// continue if there are no unrecognized gaps between words
			if (this.query!.words[token]?.start == i) continue;
			var remainder = this.original.substring(i, this.query!.words[token]?.start);

			this.words.push(new Word(remainder).withParent(await this.api));
			i += remainder.length;
		}
	}

	furigana(format: JapaneseFormatter = "HTML"): string {
		return this.words.reduce((out, word) => {
			return out + word.furigana(format);
		}, "");
	}

  public async update() {
    if (this.frozen) return;
    // unresolve ready
		this.ready = new Promise(res => this._resolveReady = res);

    // fetch sentence from DB
		await this.fetch();
    // parse words into Word
    await this.updateWords();

    // mark ready again
		this._resolveReady();
  }

  public at(term: string) {
    return this.original.indexOf(term);
  }

  public async break(location: number) {
    this.breaks.push(location);
    await this.update();
  }

  public async freeze() {
    this.frozen = true;
  }

  public async unfreeze() {
    this.frozen = false;
    await this.update();
  }
}