const Watchpack = require("watchpack");
class FooPlugin {
  constructor() {
    this.started = false;
    this.abort = false;
    this.aborted = false;
    this.files = [];
    this.dirs = [];
  }

  apply(compiler) {
    compiler.hooks.compilation.tap("FooPlugin", this.onCompilation.bind(this));
    compiler.hooks.afterCompile.tapAsync("FooPlugin", this.onAfterCompile.bind(this));
    compiler.hooks.invalid.tap("FooPlugin", this.onInvalid.bind(this));
    compiler.hooks.afterEmit.tapAsync("FooPlugin", this.onAfterEmit.bind(this));
    compiler.hooks.done.tapAsync("FooPlugin", this.onDone.bind(this));
    compiler.hooks.failed.tap("FooPlugin", this.onFailed.bind(this));
    compiler.hooks.shouldEmit.tap("FooPlugin", this.onShouldEmit.bind(this));
  }

  onCompilation(compilation) {
    if (this.abort && !this.aborted) {
      this.aborted = true;
      console.log(new Date(), "FooPlugin", "compilation", "should abort");
      // compilation.errors.push(this.newError());
    } else {
      console.log(new Date(), "FooPlugin", "compilation");
    }
  }

  onAfterCompile(compilation, done) {
    if (this.abort && !this.aborted) {
      this.aborted = true;
      console.log(new Date(), "FooPlugin", "afterCompile", "should abort");
      // done(this.newError());
    } else {
      console.log(new Date(), "FooPlugin", "afterCompile");
      done();
    }
  }

  onShouldEmit(compilation) {
    if (this.abort && this.aborted) {
      console.log(new Date(), "FooPlugin", "shouldEmit", "should abort");
      return false;
    } else {
      console.log(new Date(), "FooPlugin", "shouldEmit");
      return true;
    }
  }

  onInvalid(compiler) {
    console.log(new Date(), "FooPlugin", "invalid");
    this.started = true;
  }

  onAfterEmit(compilation, done) {
    this.files = Array.from(compilation.fileDependencies);
    this.dirs = Array.from(compilation.contextDependencies);
    done();
  }

  onDone(stats, done) {
    console.log(new Date(), "FooPlugin", "done", `started=${this.started} abort=${this.abort} aborted=${this.aborted}`);
    this.started = false;
    this.abort = false;
    this.aborted = false;
    if (this.watchpack) {
      this.watchpack.close();
    }
    this.watchpack = this.newWatchpack();
    this.watchpack.watch([...this.files], [...this.dirs]);
    this.watchpack.on("change", this.onChange.bind(this));
    done();
  }

  onFailed(error) {
    console.log(new Date(), "FooPlugin", "failed", error, `started=${this.started} abort=${this.abort} aborted=${this.aborted}`);
    this.started = false;
    this.abort = false;
    this.aborted = false;
  }

  onChange() {
    console.log(new Date(), "FooPlugin", "change");
    if (this.started) {
      this.abort = true;
    }
  }

  newWatchpack() {
    return new Watchpack({ aggregateTimeout: 100 });
  }

  newError() {
    return new Error("ファイルが変更されました");
  }
}