import fastGlob from 'fast-glob';
import wrapAnsi from 'wrap-ansi';
import AddAssetPlugin from 'add-asset-webpack-plugin';
import LicenseCheckerWebpackPlugin from 'license-checker-webpack-plugin';
import MiniCssExtractPlugin from 'mini-css-extract-plugin';
import MonacoWebpackPlugin from 'monaco-editor-webpack-plugin';
import {VueLoaderPlugin} from 'vue-loader';
import EsBuildLoader from 'esbuild-loader';
import {parse, dirname} from 'node:path';
import webpack from 'webpack';
import {fileURLToPath} from 'node:url';
import {readFileSync} from 'node:fs';
import {env} from 'node:process';

const {EsbuildPlugin} = EsBuildLoader;
const {SourceMapDevToolPlugin, DefinePlugin} = webpack;
const formatLicenseText = (licenseText) => wrapAnsi(licenseText || '', 80).trim();

const glob = (pattern) => fastGlob.sync(pattern, {
  cwd: dirname(fileURLToPath(new URL(import.meta.url))),
  absolute: true,
});

const themes = {};
for (const path of glob('web_src/css/themes/*.css')) {
  themes[parse(path).name] = [path];
}

const isProduction = env.NODE_ENV !== 'development';

// ENABLE_SOURCEMAP accepts the following values:
// true - all enabled, the default in development
// reduced - minimal sourcemaps, the default in production
// false - all disabled
let sourceMaps;
if ('ENABLE_SOURCEMAP' in env) {
  sourceMaps = ['true', 'false'].includes(env.ENABLE_SOURCEMAP) ? env.ENABLE_SOURCEMAP : 'reduced';
} else {
  sourceMaps = isProduction ? 'reduced' : 'true';
}

const filterCssImport = (url, ...args) => {
  const cssFile = args[1] || args[0]; // resourcePath is 2nd argument for url and 3rd for import
  const importedFile = url.replace(/[?#].+/, '').toLowerCase();

  if (cssFile.includes('fomantic')) {
    if (/brand-icons/.test(importedFile)) return false;
    if (/(eot|ttf|otf|woff|svg)$/i.test(importedFile)) return false;
  }

  if (cssFile.includes('katex') && /(ttf|woff)$/i.test(importedFile)) {
    return false;
  }

  return true;
};

// in case lightningcss fails to load, fall back to esbuild for css minify
let LightningCssMinifyPlugin;
try {
  ({LightningCssMinifyPlugin} = await import('lightningcss-loader'));
} catch {}

/** @type {import("webpack").Configuration} */
export default {
  mode: isProduction ? 'production' : 'development',
  entry: {
    index: [
      fileURLToPath(new URL('web_src/js/jquery.js', import.meta.url)),
      fileURLToPath(new URL('web_src/fomantic/build/semantic.js', import.meta.url)),
      fileURLToPath(new URL('web_src/js/index.js', import.meta.url)),
      fileURLToPath(new URL('node_modules/easymde/dist/easymde.min.css', import.meta.url)),
      fileURLToPath(new URL('web_src/fomantic/build/semantic.css', import.meta.url)),
      fileURLToPath(new URL('web_src/css/index.css', import.meta.url)),
    ],
    webcomponents: [
      fileURLToPath(new URL('web_src/js/webcomponents/webcomponents.js', import.meta.url)),
    ],
    forgejoswagger: [ // Forgejo swagger is OpenAPI 3.0.0 and has specific parameters
      fileURLToPath(new URL('web_src/js/standalone/forgejo-swagger.js', import.meta.url)),
      fileURLToPath(new URL('web_src/css/standalone/swagger.css', import.meta.url)),
    ],
    swagger: [
      fileURLToPath(new URL('web_src/js/standalone/swagger.js', import.meta.url)),
      fileURLToPath(new URL('web_src/css/standalone/swagger.css', import.meta.url)),
    ],
    'eventsource.sharedworker': [
      fileURLToPath(new URL('web_src/js/features/eventsource.sharedworker.js', import.meta.url)),
    ],
    ...(!isProduction && {
      devtest: [
        fileURLToPath(new URL('web_src/js/standalone/devtest.js', import.meta.url)),
        fileURLToPath(new URL('web_src/css/standalone/devtest.css', import.meta.url)),
      ],
    }),
    ...themes,
  },
  devtool: false,
  output: {
    path: fileURLToPath(new URL('public/assets', import.meta.url)),
    filename: () => 'js/[name].js',
    chunkFilename: ({chunk}) => {
      const language = (/monaco.*languages?_.+?_(.+?)_/.exec(chunk.id) || [])[1];
      return `js/${language ? `monaco-language-${language.toLowerCase()}` : `[name]`}.[contenthash:8].js`;
    },
  },
  optimization: {
    minimize: isProduction,
    minimizer: [
      new EsbuildPlugin({
        target: 'es2015',
        minify: true,
        css: !LightningCssMinifyPlugin,
        legalComments: 'none',
      }),
      LightningCssMinifyPlugin && new LightningCssMinifyPlugin({
        sourceMap: sourceMaps === 'true',
      }),
    ],
    splitChunks: {
      chunks: 'async',
      name: (_, chunks) => chunks.map((item) => item.name).join('-'),
    },
    moduleIds: 'named',
    chunkIds: 'named',
  },
  module: {
    rules: [
      {
        test: /\.vue$/i,
        exclude: /node_modules/,
        loader: 'vue-loader',
      },
      {
        test: /\.js$/i,
        exclude: /node_modules/,
        use: [
          {
            loader: 'esbuild-loader',
            options: {
              loader: 'js',
              target: 'es2015',
            },
          },
        ],
      },
      {
        test: /\.css$/i,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          {
            loader: 'css-loader',
            options: {
              sourceMap: sourceMaps === 'true',
              url: {filter: filterCssImport},
              import: {filter: filterCssImport},
            },
          },
        ],
      },
      {
        test: /\.svg$/i,
        include: fileURLToPath(new URL('public/assets/img/svg', import.meta.url)),
        type: 'asset/source',
      },
      {
        test: /\.(ttf|woff2?)$/i,
        type: 'asset/resource',
        generator: {
          filename: 'fonts/[name].[contenthash:8][ext]',
        }
      },
      {
        test: /\.png$/i,
        type: 'asset/resource',
        generator: {
          filename: 'img/webpack/[name].[contenthash:8][ext]',
        }
      },
    ],
  },
  plugins: [
    new DefinePlugin({
      __VUE_OPTIONS_API__: true, // at the moment, many Vue components still use the Vue Options API
      __VUE_PROD_DEVTOOLS__: false, // do not enable devtools support in production
    }),
    new VueLoaderPlugin(),
    new MiniCssExtractPlugin({
      filename: 'css/[name].css',
      chunkFilename: 'css/[name].[contenthash:8].css',
    }),
    sourceMaps !== 'false' && new SourceMapDevToolPlugin({
      filename: '[file].[contenthash:8].map',
      ...(sourceMaps === 'reduced' && {include: /^js\/index\.js$/}),
    }),
    new MonacoWebpackPlugin({
      filename: 'js/monaco-[name].[contenthash:8].worker.js',
    }),
    isProduction ? new LicenseCheckerWebpackPlugin({
      outputFilename: 'licenses.txt',
      outputWriter: ({dependencies}) => {
        const line = '-'.repeat(80);
        const goJson = readFileSync('assets/go-licenses.json', 'utf8');
        const goModules = JSON.parse(goJson).map(({name, licenseText}) => {
          return {name, body: formatLicenseText(licenseText)};
        });
        const jsModules = dependencies.map(({name, version, licenseName, licenseText}) => {
          return {name, version, licenseName, body: formatLicenseText(licenseText)};
        });

        const modules = [...goModules, ...jsModules].sort((a, b) => a.name.localeCompare(b.name));
        return modules.map(({name, version, licenseName, body}) => {
          const title = licenseName ? `${name}@${version} - ${licenseName}` : name;
          return `${line}\n${title}\n${line}\n${body}`;
        }).join('\n');
      },
      override: {
        'khroma@*': {licenseName: 'MIT'}, // https://github.com/fabiospampinato/khroma/pull/33
      },
      emitError: true,
      allow: '(Apache-2.0 OR BSD-2-Clause OR BSD-3-Clause OR MIT OR ISC OR CPAL-1.0 OR Unlicense OR EPL-1.0 OR EPL-2.0)',
    }) : new AddAssetPlugin('licenses.txt', `Licenses are disabled during development`),
  ],
  performance: {
    hints: false,
    maxEntrypointSize: Infinity,
    maxAssetSize: Infinity,
  },
  resolve: {
    symlinks: false,
  },
  watchOptions: {
    ignored: [
      'node_modules/**',
    ],
  },
  stats: {
    assetsSort: 'name',
    assetsSpace: Infinity,
    cached: false,
    cachedModules: false,
    children: false,
    chunkModules: false,
    chunkOrigins: false,
    chunksSort: 'name',
    colors: true,
    entrypoints: false,
    excludeAssets: [
      /^js\/monaco-language-.+\.js$/,
      !isProduction && /^licenses.txt$/,
    ].filter(Boolean),
    groupAssetsByChunk: false,
    groupAssetsByEmitStatus: false,
    groupAssetsByInfo: false,
    groupModulesByAttributes: false,
    modules: false,
    reasons: false,
    runtimeModules: false,
  },
};
