/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

const path = require('path');
const fs = require('fs');
const LicenseWebpackPlugin = require('license-webpack-plugin').LicenseWebpackPlugin;
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
var remToPx = require('postcss-rem-to-pixel');
const webpack = require("webpack");

const distPath = path.resolve(__dirname, 'dist');

class WhenDoneCopyToHiplotStaticDir {
  constructor(installs) {
    this.installs = installs;
  }
  apply(compiler) {
    compiler.hooks.afterEmit.tap('WhenDoneCopyToHiplotStaticDir', (
      stats /* stats is passed as argument when done hook is tapped.  */
    ) => {
      for (let dest in this.installs) {
        const origin = path.resolve(distPath, this.installs[dest]);
        try {
            fs.mkdirSync(path.dirname(dest), {recursive: true});
        } catch (err) { /* `recursive` option is node >= 10.0. Otherwise will throw if the directory already exists */ }
        fs.copyFileSync(origin, dest);
      }
    });
  }
}

const exportConfig = function(env, config = {}) {
  const version = (process.env && process.env.HIPLOT_VERSION) ? process.env.HIPLOT_VERSION : '0.0.0';
  const package = (config.web && process.env && process.env.HIPLOT_PACKAGE) ? process.env.HIPLOT_PACKAGE : 'hiplot';
  const is_debug = (env && env.debug);
  const package_name_full = `${config.web ? "bundle" : "lib"}-${package}-${version}${is_debug ? "-dbg" : ""}`;
  var plugins = [
    new LicenseWebpackPlugin(),
    new webpack.BannerPlugin(
" Copyright (c) Facebook, Inc. and its affiliates.\n\n\
This source code is licensed under the MIT license found in the\n\
LICENSE file in the root directory of this source tree."),
    new webpack.DefinePlugin({
      'HIPLOT_PACKAGE_NAME_FULL': JSON.stringify(package_name_full),
    })
  ];
  if (config.installs) {
    plugins.push(new WhenDoneCopyToHiplotStaticDir(config.installs));
  }
  return {
    resolve: {
      extensions: ['.ts', '.tsx', '.js', '.json', '.css', '.svg', '.scss'],
    },
    module: {
      rules: [
          {
            test: /datatables\.net.*js$/,
            use: [{
              loader: "imports-loader",
              options: {
                additionalCode:
                  "var define = false;", //Disable AMD for misbehaving libraries
              },
            }],
          },
          {
              test: /\.(png|jp(e*)g|svg)$/,
              use: [{
                  loader: 'url-loader',
                  options: {
                      limit: 1000000, // Convert images < 1MB to base64 strings
                      name: 'images/[contenthash]-[name].[ext]',
                  }
              }]
          },
          {
            test: /\.s(a|c)ss$/,
            exclude: /global.(s(a|c)ss)$/,
            use: [
              { loader: 'style-loader'},
              {
                loader: "css-loader",
                options: {
                  modules: is_debug ? {localIdentName: '[local]_[contenthash:base64:5]'} : true
                }
              },
              {
                loader: 'sass-loader',
                options: {
                  sourceMap: true
                }
              }
            ]
          },
          {
            test: /global.(s(a|c)ss)$/,
            use: [
              'style-loader',
              "css-loader",
              {
                loader: 'postcss-loader',
                options: {
                  // We can be emded anywhere, with arbitrary `font-size` for `body` element
                  // So we better don't use `rem` in CSS and set sizes in pixel instead.
                  postcssOptions: {
                    plugins: [remToPx({
                      propList: ['font', 'font-size', 'line-height', 'letter-spacing', 'padding*', 'border*'],
                    })],
                  },
                }
              },
              {
                loader: 'sass-loader',
                options: {
                  sourceMap: true
                }
              }
            ]
          },
          {
              test: /\.worker.ts?$/,
              loader: 'worker-loader',
              options: { inline: true, fallback: false }
          },
          {
              // Let's pass all third-party libraries
              // to ensure everything is es3
              test: /\.js$/,
              loader: 'ts-loader',
              options: {
                transpileOnly: true,
              }
          },
          {
              test: /\.(ts|tsx)$/,
              loader: 'ts-loader',
              exclude: /node_modules/,
              options: {
                compilerOptions: {
                  declaration: false,
                }
              }
          },
          // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
          {
              enforce: "pre",
              test: /\.js$/,
              loader: "source-map-loader"
          },
      ],
    },
    stats: {
      colors: true
    },
    plugins: plugins,
    devtool: 'source-map',
}};


// Make sure we generate ES3 code
const webpackOutputEnvironment = {
  // The environment supports arrow functions ('() => { ... }').
  arrowFunction: false,
  // The environment supports BigInt as literal (123n).
  bigIntLiteral: false,
  // The environment supports const and let for variable declarations.
  const: false,
  // The environment supports destructuring ('{ a, b } = obj').
  destructuring: false,
  // The environment supports an async import() function to import EcmaScript modules.
  dynamicImport: false,
  // The environment supports 'for of' iteration ('for (const x of array) { ... }').
  forOf: false,
  // The environment supports ECMAScript Module syntax to import ECMAScript modules (import ... from '...').
  module: false,
};

module.exports = [
// Web config - for hiplot webserver, notebook and streamlit
env => {
  const pyBuilt = path.resolve(__dirname, 'hiplot', 'static', 'built');

  var installs = {};
  // Everything has to be installed both in `dist/` and `hiplot/static/built/` for CI testing
  const installToFolders = [path.resolve(pyBuilt, ''), path.resolve(__dirname, 'dist', 'streamlit_component')];
  installToFolders.forEach(function(sc) {
    installs[path.resolve(sc, 'streamlit_component', 'hiplot_streamlit.bundle.js')] = 'hiplot_streamlit.bundle.js';
    installs[path.resolve(sc, 'streamlit_component', 'index.html')] = '../src/index_streamlit.html';
    installs[path.resolve(sc, 'hiplot.bundle.js')] = (env && env.test) ? 'hiplot_test.bundle.js' : 'hiplot.bundle.js';
  });

  return {
    entry: {
      'hiplot': `./src/hiplot_web.tsx`,
      'hiplot_test': `./src/hiplot_test.tsx`,
      'hiplot_streamlit': `./src/hiplot_streamlit.tsx`,
    },
    output: {
        path: distPath,
        filename: '[name].bundle.js',
        library: 'hiplot',
        libraryTarget: 'var',
        environment: webpackOutputEnvironment,
    },
    ...exportConfig(env, {
      web: true,
      installs: installs,
    }),
}},
// Node config - for npm library
env => { return {
    entry: {
      'hiplot': `./src/hiplot.tsx`,
    },
    output: {
        path: distPath,
        filename: '[name].lib.js',
        library: 'hiplot',
        libraryTarget: 'umd',
        environment: webpackOutputEnvironment,
    },
    externals: {
      react: {
        root: "React",
        commonjs2: "react",
        commonjs: "react",
        amd: "react"
      },
    },
    ...exportConfig(env),
    optimization: {
      minimize: false,
      // moduleIds: 'named', // useful to debug npmjs package
    }
};}
];