'use strict'
const path = require('path')
const fs = require('fs')

function resolve(dir) {
  return path.join(__dirname, dir)
}

// 离线瓦片目录：放在 public 外避免构建时复制导致 EMFILE（too many open files）
const tilesDir = path.join(__dirname, 'tiles')
const tilesInPublic = path.join(__dirname, 'public', 'tiles')

const CompressionPlugin = require('compression-webpack-plugin')
// 引入 CopyWebpackPlugin 用于复制 Cesium 静态资源
const CopyWebpackPlugin = require('copy-webpack-plugin')

const name = process.env.VUE_APP_TITLE || '若依管理系统' // 网页标题
const baseUrl = 'http://127.0.0.1:8080' // 后端接口
const port = process.env.port || process.env.npm_config_port || 80 // 端口

// 定义 Cesium 源码路径
const cesiumSource = 'node_modules/cesium/Build/Cesium'

module.exports = {
  // 部署生产环境和开发环境下的URL。
  publicPath: process.env.NODE_ENV === "production" ? "/" : "/",
  outputDir: 'dist',
  assetsDir: 'static',
  productionSourceMap: false,

  // 核心修改：让 Babel 编译 Cesium 和相关依赖，解决语法报错
  transpileDependencies: [
    'quill',
    'cesium',
    '@cesium/engine',
    '@cesium/widgets',
    '@zip.js',
    '@spz-loader'
  ],

  devServer: {
    host: '0.0.0.0',
    port: port,
    open: true,
    // 从 public 外提供 /tiles，避免 2 万+ 瓦片参与 public 复制触发 EMFILE
    before(app) {
      const express = require('express')
      const serveAt = fs.existsSync(tilesDir) ? tilesDir : tilesInPublic
      app.use('/tiles', express.static(serveAt))
    },
    proxy: {
      [process.env.VUE_APP_BASE_API]: {
        target: baseUrl,
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_API]: ''
        }
      },
      '^/v3/api-docs/(.*)': {
        target: baseUrl,
        changeOrigin: true
      }
    },
    disableHostCheck: true
  },

  css: {
    loaderOptions: {
      sass: {
        sassOptions: { outputStyle: "expanded" }
      }
    }
  },

  configureWebpack: {
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    plugins: [
      // 核心修改：复制 Cesium 静态资源到 public/cesium 目录下
      new CopyWebpackPlugin([
        { from: path.join(cesiumSource, 'Workers'), to: 'cesium/Workers' },
        { from: path.join(cesiumSource, 'Assets'), to: 'cesium/Assets' },
        { from: path.join(cesiumSource, 'Widgets'), to: 'cesium/Widgets' },
        { from: path.join(cesiumSource, 'ThirdParty'), to: 'cesium/ThirdParty' }
      ]),

      // gzip压缩
      new CompressionPlugin({
        cache: false,
        test: /\.(js|css|html|jpe?g|png|gif|svg)?$/i,
        filename: '[path][base].gz[query]',
        algorithm: 'gzip',
        minRatio: 0.8,
        deleteOriginalAssets: false
      })
    ]
  },

  chainWebpack(config) {
    config.plugins.delete('preload')
    config.plugins.delete('prefetch')

    // 核心修改：添加 import.meta 加载器支持 (解决 Cesium 1.97+ 报错)
    config.module
      .rule('import-meta')
      .test(/\.js$/)
      .include.add(/node_modules/)
      .end()
      .use('import-meta-loader')
        .loader('@open-wc/webpack-import-meta-loader')
        .end();

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              inline: /runtime\..*\.js$/
            }])
            .end()

          config.optimization.splitChunks({
            chunks: 'all',
            cacheGroups: {
              libs: {
                name: 'chunk-libs',
                test: /[\\/]node_modules[\\/]/,
                priority: 10,
                chunks: 'initial'
              },
              elementUI: {
                name: 'chunk-elementUI',
                test: /[\\/]node_modules[\\/]_?element-ui(.*)/,
                priority: 20
              },
              commons: {
                name: 'chunk-commons',
                test: resolve('src/components'),
                minChunks: 3,
                priority: 5,
                reuseExistingChunk: true
              }
            }
          })
          config.optimization.runtimeChunk('single')
    })
  }
}