import svelte from 'rollup-plugin-svelte';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
// import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';
import sveltePreprocess from 'svelte-preprocess';
import typescript from '@rollup/plugin-typescript';
import alias from "@rollup/plugin-alias";
import path from "path";
// import css from "rollup-plugin-css-only";

const production = process.env.NODE_ENV === "production";

const customResolver = resolve({
  extensions: [".ts", ".svelte"]
});

export default {
  input: path.resolve(__dirname, "src/main.ts"),
  output: {
    sourcemap: true,
    format: 'iife',
    name: 'app',
    file: path.resolve(__dirname, "public/build/bundle.js")
  },
  onwarn: (message, warn) => {
    if (message.code === "CIRCULAR_DEPENDENCY") {
      return;
    }
    warn(message);
  },
  plugins: [
    alias({
      entries: [
        { find: "@src", replacement: path.resolve(__dirname, "src") },
      ],
      customResolver
    }),
    svelte({
      // enable run-time checks when not in production
      dev: !production,
      // we'll extract any component CSS out into
      // a separate file - better for performance
      preprocess: sveltePreprocess({
        aliases: ['ts', 'typescript']
      }),
    }),
    // css({ output: path.resolve(__dirname, "public/build/bundle.css") }),

    // If you have external dependencies installed from
    // npm, you'll most likely need these plugins. In
    // some cases you'll need additional configuration -
    // consult the documentation for details:
    // https://github.com/rollup/plugins/tree/master/packages/commonjs
    resolve({
      browser: true,
      dedupe: ['svelte']
    }),
    commonjs(),
    typescript({
      sourceMap: !production,
      tsconfig: path.resolve(__dirname, "tsconfig.json"),
    }),

    // In dev mode, call `npm run start` once
    // the bundle has been generated
    // !production && serve(),

    // Watch the `public` directory and refresh the
    // browser on changes when not in production
    // !production && livereload('public'),

    // If we're building for production (npm run build
    // instead of npm run dev), minify
    production && terser()
  ],
  watch: {
    clearScreen: false
  }
};

// function serve() {
//   let started = false;

//   return {
//     writeBundle() {
//       if (!started) {
//         started = true;

//         require('child_process').spawn('npm', ['run', 'dev'], {
//           stdio: ['ignore', 'inherit', 'inherit'],
//           shell: true
//         });
//       }
//     }
//   };
// }