import Uni from '@uni-helper/plugin-uni'
import UniHelperComponents from '@uni-helper/vite-plugin-uni-components'
import UniHelperLayouts from '@uni-helper/vite-plugin-uni-layouts'
import UniHelperManifest from '@uni-helper/vite-plugin-uni-manifest'
import UniHelperPages from '@uni-helper/vite-plugin-uni-pages'
import { UniEchartsResolver } from 'uni-echarts/resolver'
import UnoCSS from 'unocss/vite'
import AutoImport from 'unplugin-auto-import/vite'
import { defineConfig } from 'vite'
import UniPolyfill from 'vite-plugin-uni-polyfill'

/**
 * 兜底处理 uni:json 插件对 pages.json 的解析失败
 *
 * 背景：vite-plugin-uni-pages 会用 comment-json 往 pages.json 里写入
 * `// GENERATED BY UNI-PAGES...` 注释。uni-app 的 uni:json 插件本应用
 * jsonc-parser 吃掉注释，但当它拿到半截文件内容（HBuilderX 写入与读取竞态）
 * 时 parse 会返回 undefined，导致插件没产出 code，随后 Vite 内置 vite:json
 * 用严格 JSON.parse 接手，撞上注释直接报错：
 *   Failed to parse JSON file, invalid JSON syntax found at position -1
 *
 * 这个插件挂在最前面（enforce: 'pre'），保证 vite:json 拿到的一定是无注释的
 * 合法 JSON，从而绕开该问题。
 */
function stripJsonComments() {
  return {
    name: 'strip-json-comments',
    enforce: 'pre' as const,
    transform(code: string, id: string) {
      // 只处理 src 下的 pages.json / manifest.json
      if (!/[\\/](?:pages|manifest)\.json(?:\?.*)?$/.test(id))
        return null
      // 本身就不含注释，交回后续插件处理
      if (!code.includes('//'))
        return null

      let inString = false
      let escaped = false
      let result = ''

      for (let i = 0; i < code.length; i++) {
        const ch = code[i]

        if (inString) {
          result += ch
          if (escaped)
            escaped = false
          else if (ch === '\\')
            escaped = true
          else if (ch === '"')
            inString = false
          continue
        }

        if (ch === '"') {
          inString = true
          result += ch
          continue
        }

        // 行注释：跳到行尾
        if (ch === '/' && code[i + 1] === '/') {
          while (i < code.length && code[i] !== '\n') i++
          result += '\n'
          continue
        }

        // 块注释：跳到结束
        if (ch === '/' && code[i + 1] === '*') {
          i += 2
          while (i < code.length && !(code[i] === '*' && code[i + 1] === '/')) i++
          i++
          continue
        }

        result += ch
      }

      return { code: result, map: null }
    },
  }
}

// https://vitejs.dev/config/
export default defineConfig({
  css: {
    preprocessorOptions: {
      scss: {
        // 压制依赖包（uni-ui 等）的 Sass 旧 API / 全局函数弃用警告
        silenceDeprecations: ['legacy-js-api', 'global-builtin', 'color-functions', 'import'],
      },
    },
  },
  plugins: [
    // 必须放最前：在 uni:json / vite:json 之前剥掉 pages.json 里的注释
    stripJsonComments(),
    // https://uni-helper.js.org/vite-plugin-uni-manifest
    UniHelperManifest(),
    // https://uni-helper.js.org/vite-plugin-uni-pages
    UniHelperPages({
      dts: 'src/uni-pages.d.ts',
      homePage: 'pages/Ahome/index',
    }),
    // https://uni-helper.js.org/vite-plugin-uni-layouts
    UniHelperLayouts(),
    // https://uni-helper.js.org/vite-plugin-uni-components
    UniHelperComponents({
      dts: 'src/components.d.ts',
      directoryAsNamespace: true,
      resolvers: [UniEchartsResolver()],
    }),
    // https://uni-helper.js.org/plugin-uni
    Uni(),
    UniPolyfill(),
    // https://github.com/antfu/unplugin-auto-import
    AutoImport({
      imports: ['vue', '@vueuse/core', 'uni-app'],
      dts: 'src/auto-imports.d.ts',
      dirs: ['src/composables', 'src/stores', 'src/utils'],
      vueTemplate: true,
    }),
    // https://github.com/antfu/unocss
    // see unocss.config.ts for config
    UnoCSS(),
  ],
})