/**
 * DEVELOPMENT WEBPACK CONFIGURATION
 */

const fs = require('fs');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
const argv = require('minimist')(process.argv.slice(2));
// PostCSS plugins
const cssnext = require('postcss-cssnext');
const postcssFocus = require('postcss-focus');
const postcssReporter = require('postcss-reporter');
const plugins = [
  new webpack.HotModuleReplacementPlugin(), // Tell webpack we want hot reloading
];

const isAdmin = process.env.IS_ADMIN === 'true';

// Build the `index.htm file`
if (isAdmin) {
  plugins.push(new HtmlWebpackPlugin({
    favicon: 'admin/src/favicon.ico',
    inject: true, // Inject all files that are generated by webpack, e.g. bundle.js
    templateContent: templateContent(), // eslint-disable-line no-use-before-define
  }));
}

const appPath = isAdmin
  ? path.join(process.cwd(), 'admin', 'src', 'app.js')
  : path.join(process.cwd(), 'node_modules', 'strapi-helper-plugin', 'lib', 'src', 'app.js');

const logger = require('../../server/logger');

const pkg = require(path.resolve(process.cwd(), 'package.json'));
const dllPlugin = pkg.dllPlugin;
const pluginId = pkg.name.replace(/^strapi-/i, '');
const port = argv.port || process.env.PORT || 3000;

module.exports = require('./webpack.base.babel')({
  // Add hot reloading in development
  entry: [
    `webpack-hot-middleware/client?path=http://localhost:${port}/__webpack_hmr`,
    appPath,
  ],

  // Don't use hashes in dev mode for better performance
  output: {
    filename: '[name].js',
    chunkFilename: '[name].chunk.js',
    publicPath: `http://127.0.0.1:${port}/`,
  },

  // Add development plugins
  plugins: dependencyHandlers().concat(plugins), // eslint-disable-line no-use-before-define

  // Transform our own .scss files
  cssLoaders: [{
    loader: 'style-loader',
  }, {
    loader: 'css-loader',
    options: {
      localIdentName: `${pluginId}[local]__[path][name]__[hash:base64:5]`,
      modules: true,
      importLoaders: 1,
      sourceMap: true,
    },
  }, {
    loader: 'postcss-loader',
    options: {
      config: {
        path: path.resolve(__dirname, '..', 'postcss', 'postcss.config.js'),
      },
    },
  }, {
    loader: 'sass-loader',
  }],

  // Process the CSS with PostCSS
  postcssPlugins: [
    postcssFocus(), // Add a :focus to every :hover
    cssnext({ // Allow future CSS features to be used, also auto-prefixes the CSS...
      browsers: ['last 2 versions', 'IE > 10'], // ...based on this browser list
    }),
    postcssReporter({ // Posts messages from plugins to the terminal
      clearMessages: true,
    }),
  ],

  // Tell babel that we want presets and to hot-reload
  babelPresets: [
    [
      require.resolve('babel-preset-latest'),
      {
        es2015: {
          modules: false,
        },
      },
    ],
    require.resolve('babel-preset-react'),
    require.resolve('babel-preset-stage-0'),
    require.resolve('babel-preset-react-hmre'),
  ],

  // Emit a source map for easier debugging
  devtool: 'cheap-module-eval-source-map',
});

/**
 * Select which plugins to use to optimize the bundle's handling of
 * third party dependencies.
 *
 * If there is a dllPlugin key on the project's package.json, the
 * Webpack DLL Plugin will be used.  Otherwise the CommonsChunkPlugin
 * will be used.
 *
 */
function dependencyHandlers() {
  // Don't do anything during the DLL Build step
  if (process.env.BUILDING_DLL) {
    return [];
  }

  // If the package.json does not have a dllPlugin property, use the CommonsChunkPlugin
  if (!dllPlugin) {
    return [
      new webpack.optimize.CommonsChunkPlugin({
        name: 'vendor',
        children: true,
        minChunks: 2,
        async: true,
      }),
    ];
  }

  const dllPath = dllPlugin.path;

  /**
   * If DLLs aren't explicitly defined, we assume all production dependencies listed in package.json
   * Reminder: You need to exclude any server side dependencies by listing them in dllConfig.exclude
   */
  if (!dllPlugin.dlls) {
    const manifestPath = path.resolve(dllPath, 'strapiPluginDeps.json');

    if (!fs.existsSync(manifestPath)) {
      logger.error('The DLL manifest is missing. Please run `npm run build:dll`');
      process.exit(0);
    }

    return [
      new webpack.DllReferencePlugin({
        context: process.cwd(),
        manifest: require(manifestPath), // eslint-disable-line global-require
      }),
    ];
  }

  // If DLLs are explicitly defined, we automatically create a DLLReferencePlugin for each of them.
  const dllManifests = Object.keys(dllPlugin.dlls).map((name) => path.join(dllPath, `/${name}.json`));

  return dllManifests.map((manifestPath) => {
    if (!fs.existsSync(path)) {
      if (!fs.existsSync(manifestPath)) {
        logger.error(`The following Webpack DLL manifest is missing: ${path.basename(manifestPath)}`);
        logger.error(`Expected to find it in ${dllPath}`);
        logger.error('Please run: npm run build:dll');

        process.exit(0);
      }
    }

    return new webpack.DllReferencePlugin({
      context: process.cwd(),
      manifest: require(manifestPath), // eslint-disable-line global-require
    });
  });
}

/**
 * We dynamically generate the HTML content in development so that the different
 * DLL Javascript files are loaded in script tags and available to our application.
 */
function templateContent() {
  const html = fs.readFileSync(
    path.resolve(process.cwd(), 'admin/src/index.html')
  ).toString();

  return html;
}