/*******************************************************************************
 * © Apployees Inc., 2019
 * All Rights Reserved.
 ******************************************************************************/
import { IBuildWebserverBuilderOptions } from "../common/webserver-types";
import { getAssetsUrl } from "../common/env";
import {
  cssModuleRegex,
  cssRegex,
  getCSSModuleLocalIdent,
  lessModuleRegex,
  lessRegex,
  sassModuleRegex,
  sassRegex,
} from "../common/common-loaders";
import _ from "lodash";
import NodeSass from "node-sass";

export function getServerLoaders(options: IBuildWebserverBuilderOptions) {
  const isEnvDevelopment: boolean = options.dev;
  const isEnvProduction = !isEnvDevelopment;

  // Webpack uses `publicPath` to determine where the app is being served from.
  // It requires a trailing slash, or the file assets will get an incorrect path.
  // In development, we always serve from the root. This makes config easier.
  const publicPath = getAssetsUrl(options);

  // common function to get style loaders
  const getStyleLoaders = (isForModule: boolean, cssOptions?) => {
    cssOptions = isForModule
      ? {
          ...cssOptions,
          localsConvention: "dashesOnly",
          modules: {
            localIdentName: getCSSModuleLocalIdent(isEnvDevelopment),
          },
        }
      : cssOptions;

    return [
      {
        loader: _.isString(require.resolve("css-loader")) ? require.resolve("css-loader") : "css-loader",
        options: {
          ...cssOptions,
          onlyLocals: true,
        },
      },
      {
        loader: _.isString(require.resolve("postcss-loader")) ? require.resolve("postcss-loader") : "postcss-loader",
        options: {
          ident: "postcss",
          plugins: () => [
            require("postcss-flexbugs-fixes"),
            require("postcss-preset-env")({
              autoprefixer: {
                flexbox: "no-2009",
              },
              stage: 3,
            }),
          ],
        },
      },
    ].filter(Boolean);
  };

  return [
    {
      test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
      loader: _.isString(require.resolve("url-loader")) ? require.resolve("url-loader") : "url-loader",
      options: {
        limit: options.imageInlineSizeLimit,
        name: "static/media/[name].[hash:8].[ext]",
      },
    },
    {
      test: cssRegex,
      exclude: cssModuleRegex,
      loader: _.isString(require.resolve("css-loader")) ? require.resolve("css-loader") : "css-loader",
    },
    {
      test: cssModuleRegex,
      use: getStyleLoaders(true, {
        importLoaders: 1,
      }),
    },
    {
      test: sassRegex,
      exclude: sassModuleRegex,
      use: getStyleLoaders(false, {
        importLoaders: 2,
      }).concat(
        {
          loader: _.isString(require.resolve("resolve-url-loader"))
            ? require.resolve("resolve-url-loader")
            : "resolve-url-loader",
          options: {
            sourceMap: false,
          },
        },
        {
          loader: _.isString(require.resolve("sass-loader")) ? require.resolve("sass-loader") : "sass-loader",
          options: {
            implementation: NodeSass,
            sourceMap: false,
          },
        },
      ),
      sideEffects: true,
    },
    {
      test: sassModuleRegex,
      use: getStyleLoaders(true, {
        importLoaders: 2,
      }).concat(
        {
          loader: _.isString(require.resolve("resolve-url-loader"))
            ? require.resolve("resolve-url-loader")
            : "resolve-url-loader",
          options: {
            sourceMap: false,
          },
        },
        {
          loader: _.isString(require.resolve("sass-loader")) ? require.resolve("sass-loader") : "sass-loader",
          options: {
            implementation: NodeSass,
            sourceMap: false,
          },
        },
      ),
    },
    {
      test: lessRegex,
      exclude: lessModuleRegex,
      use: getStyleLoaders(false, {
        importLoaders: 2,
      }).concat(
        {
          loader: _.isString(require.resolve("resolve-url-loader"))
            ? require.resolve("resolve-url-loader")
            : "resolve-url-loader",
          options: {
            sourceMap: false,
          },
        },
        {
          loader: _.isString(require.resolve("less-loader")) ? require.resolve("less-loader") : "less-loader",
          options: {
            sourceMap: false,
            javascriptEnabled: true,
            modifyVars: options.lessStyleVariables_calculated,
          },
        },
      ),
      sideEffects: true,
    },
    {
      test: lessModuleRegex,
      use: getStyleLoaders(true, {
        importLoaders: 2,
      }).concat(
        {
          loader: _.isString(require.resolve("resolve-url-loader"))
            ? require.resolve("resolve-url-loader")
            : "resolve-url-loader",
          options: {
            sourceMap: false,
          },
        },
        {
          loader: _.isString(require.resolve("less-loader")) ? require.resolve("less-loader") : "less-loader",
          options: {
            sourceMap: false,
            javascriptEnabled: true,
            modifyVars: options.lessStyleVariables_calculated,
          },
        },
      ),
    },
    {
      loader: _.isString(require.resolve("file-loader")) ? require.resolve("file-loader") : "file-loader",
      exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
      options: {
        name: "static/media/[name].[hash:8].[ext]",
        emitFile: false,
      },
    },
  ];
}