const webpack = require('webpack');
const cssnano = require('cssnano');
const pxtorem = require('postcss-pxtorem');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const debug = require('debug')('app:webpack:config');
const fs = require('fs');
const config = require('../config');

const paths = config.utils_paths;
const { __DEV__, __PROD__ } = config.globals;

function getPublicPath(path) {
  const publicPath =
    config.publicPath.substr(config.publicPath.length - 2, 1) === '/' ? config.publicPath : config.publicPath + '/';
  if (path) {
    path = path.indexOf('/') === 0 ? path.substr(1, path.length - 1) : path;
    return publicPath + path;
  } else {
    return publicPath;
  }
}

function fileNameFormat(type, ext) {
  ext = ext || '[ext]';
  return `src/[name].[${type}].${ext}`;
}
debug('Creating configuration.');

const webpackConfig = {
  name: 'client',
  target: 'web',
  cache: true,
  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.jsx', '.json'],
    alias: {
      '@src': paths.client(),
      '@project': paths.project(),
      '@components': paths.components(),
    },
  },
  module: {},
  stats: config.compiler_stats,
};

if (config.compiler_devtool) webpackConfig.devtool = config.compiler_devtool;

const APP_ENTRY = paths.client('main.js');
const devApp = [
  'webpack/hot/dev-server',
  `webpack-hot-middleware/client?path=${config.publicPath}__webpack_hmr`,
  'react-hot-loader/patch',
  APP_ENTRY,
];
webpackConfig.entry = {
  app: __DEV__ ? devApp : [APP_ENTRY],
};

webpackConfig.output = {
  filename: fileNameFormat(config.compiler_hash_type, 'js'),
  path: paths.dist(),
  publicPath: getPublicPath(),
  chunkFilename: fileNameFormat(config.compiler_hash_type, 'js'),
};

function getLibPath(path) {
  let pach = null;
  try {
    fs.readdirSync(path).forEach(file => {
      if (file.indexOf('lib') === 0) {
        pach = file;
      }
    });
  } catch (e) {
    console.log(e);
  }
  return pach;
}

if (!config.css) config.css = [];
for (let i = 0; i < config.css.length; i += 1) {
  const script = config.css[i];
  if (script.indexOf('http') !== 0) {
    config.css[i] = getPublicPath(script);
  }
}

if (!config.scripts) config.scripts = [];
for (let i = 0; i < config.scripts.length; i += 1) {
  const script = config.scripts[i];
  if (script.indexOf('http') !== 0) {
    config.scripts[i] = getPublicPath(script);
  }
}

config.scripts.push(getPublicPath(getLibPath(paths.lib())));

webpackConfig.plugins = [
  new webpack.DefinePlugin(config.globals),
  new CleanWebpackPlugin(['*'], {
    root: paths.dist(),
  }),
  new webpack.ProgressPlugin(),
  new webpack.DllReferencePlugin({
    context: paths.lib(),
    manifest: paths.lib('manifest.json'),
    extensions: ['.ts', '.tsx', '.js', '.jsx', '.json'],
  }),
  new HtmlWebpackPlugin({
    template: paths.client('index.html'),
    hash: false,
    minify: {
      collapseWhitespace: true,
    },
    title: config.title,
    filename: 'index.html',
    inject: 'body',
    globals: Object.assign(config.globals, {
      keyword: config.keyword,
      description: config.description,
      scripts: config.scripts,
      css: config.css,
    }),
  }),
  new webpack.LoaderOptionsPlugin({
    options: {
      postcss() {
        return [
          cssnano({
            autoprefixer: {
              add: true,
              browsers: ['iOS >= 7', 'Android >= 4.1'],
            },
            discardComments: {
              removeAll: true,
            },
            discardUnused: false,
            mergeIdents: false,
            reduceIdents: false,
            safe: true,
            sourcemap: true,
          }),
          pxtorem({
            rootValue: 50,
            propWhiteList: [],
          }),
        ];
      },
    },
  }),
];
if (__DEV__) {
  webpackConfig.plugins.push(new webpack.HotModuleReplacementPlugin(), new webpack.NoEmitOnErrorsPlugin());
} else {
  webpackConfig.plugins.push(
    // new webpack.optimize.CommonsChunkPlugin({
    //   name: ['app'],
    //   minChunks: function (module, count) {
    //     return module.context && module.context.indexOf('node_modules') !== -1
    //   }
    // }),
    new webpack.optimize.UglifyJsPlugin({
      cache: true,
      parallel: true,
    }),
    new ExtractTextPlugin({
      filename: fileNameFormat(config.compiler_hash_type, 'css'),
      allChunks: true,
    }),
  );
}

webpackConfig.module.rules = [
  {
    test: /\.(js|jsx)$/,
    exclude: /node_modules/,
    use: ['babel-loader', 'eslint-loader'],
  },
  {
    test: /\.yml$/,
    use: ['json-loader', 'yaml-loader'],
  },
  {
    test: /\.json$/,
    use: 'json-loader',
  },
  {
    test: /\.(svg)(\?.*)?$/,
    include: paths.client(),
    use: {
      loader: 'url-loader',
      options: {
        limit: 10240,
        name: fileNameFormat('hash'),
      },
    },
  },
  {
    test: /\.(png|jpe?g|gif)(\?.*)?$/,
    use: {
      loader: 'url-loader',
      options: {
        limit: 10240,
        name: fileNameFormat('hash'),
      },
    },
  },
  {
    test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
    use: {
      loader: 'url-loader',
      options: {
        limit: 10240,
        name: fileNameFormat('hash'),
      },
    },
  },
];

function loaderAnalysis(loaders) {
  if (__PROD__) {
    return ExtractTextPlugin.extract({
      fallback: loaders.shift(),
      use: loaders,
    });
  }
  return loaders;
}

const theme = {
  // 'primary-color': '#8573AD',
  'brand-primary': '#6b43fe',
};

webpackConfig.module.rules.push({
  test: /\.css$/,
  use: loaderAnalysis(['style-loader', 'css-loader', 'postcss-loader']),
});
webpackConfig.module.rules.push({
  test: /\.less$/,
  use: loaderAnalysis([
    'style-loader',
    'css-loader',
    'postcss-loader',
    `less-loader?{'modifyVars':${JSON.stringify(theme)}}`,
  ]),
});

module.exports = webpackConfig;