import { VueBlockFile } from './VueBlockFile'

export class VueTemplateFile extends VueBlockFile {
  private toFunction (code) {
    const vueTranspiler = require("vue-template-es2015-compiler");
    return vueTranspiler(`function render () {${code}}`);
  }

  public async process() {
    const vueCompiler = require("vue-template-compiler");
    this.loadContents();

    return this.pluginChain.reduce((chain, plugin) => {
      return chain.then(() => {
        const promise = plugin.transform(this);
        return (promise || Promise.resolve(this));
      })
      .then(() => {
        this.contents = JSON.parse(
          this.contents.replace('module.exports.default =', '').replace('module.exports =', '').trim()
        );
      })
      .then(() => vueCompiler.compile(this.contents));
    }, Promise.resolve())
    .then((compiled: any) => {
      return `Object.assign(_options, {
        _scopeId: ${this.scopeId ? JSON.stringify(this.scopeId) : null},
        render: ${this.toFunction(compiled.render)},
        staticRenderFns: [${compiled.staticRenderFns.map((t) => this.toFunction(t)).join(',')}]
      })`;
    })
    .then((contents: string) => {
      this.contents = contents;
    });
  }
}