// rollup.config.js
import commonjs from '@rollup/plugin-commonjs';
import json from '@rollup/plugin-json';
import resolve from '@rollup/plugin-node-resolve';
import typescript from '@rollup/plugin-typescript';
import license from 'rollup-plugin-license';
import autoExternal from 'rollup-plugin-auto-external';
import {
  name,
  version,
  author,
  main,
  module,
  dependencies
} from './package.json';
import path from 'path';

const settings = {
  globals: {}
};

const external = id =>
  new RegExp(
    `^(?:${Object.keys(dependencies)
      .concat([
        'entities',
        'linkify-it',
        'markdown-it',
        'markdown-it-html5-media',
        'mdurl',
        'uc.micro'
      ])
      .map(value =>
        value.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&').replace(/-/g, '\\x2d')
      )
      .join('|')})`
  ).test(id);
const input = './src/index.tsx';

export default [
  {
    input,

    output: [
      {
        ...settings,
        dir: path.dirname(main),
        format: 'cjs',
        exports: 'named',
        preserveModulesRoot: './src',
        preserveModules: true // Keep directory structure and files
      }
    ],
    external,
    plugins: getPlugins('cjs')
  },

  {
    input,

    output: [
      {
        ...settings,
        dir: path.dirname(module),
        format: 'esm',
        exports: 'named',
        preserveModulesRoot: './src',
        preserveModules: true // Keep directory structure and files
      }
    ],
    external,
    plugins: getPlugins('esm')
  }
];

function transpileDynamicImportForCJS(options) {
  return {
    name: 'transpile-dynamic-import-for-cjs',
    renderDynamicImport({format, targetModuleId}) {
      if (format !== 'cjs') {
        return null;
      }

      return {
        left: 'Promise.resolve().then(function() {return new Promise(function(fullfill) {require.ensure([',
        right:
          '], function(r) {fullfill(_interopDefaultLegacy(r("' +
          targetModuleId +
          '")))})})})'
      };
    }
  };
}

function getPlugins(format = 'esm') {
  const typeScriptOptions = {
    typescript: require('typescript'),
    sourceMap: false,
    outputToFilesystem: true,

    ...(format === 'esm'
      ? {
          compilerOptions: {
            rootDir: './src',
            outDir: path.dirname(module)
          }
        }
      : {
          compilerOptions: {
            rootDir: './src',
            outDir: path.dirname(main)
          }
        })
  };

  return [
    transpileDynamicImportForCJS(),
    autoExternal(),
    json(),
    resolve({
      jsnext: true,
      main: true
    }),
    typescript(typeScriptOptions),
    commonjs({
      sourceMap: false
    }),
    license({
      banner: `
        ${name} v${version}
        Copyright 2018<%= moment().format('YYYY') > 2018 ? '-' + moment().format('YYYY') : null %> ${author}
      `
    })
  ];
}