import vue from '@vitejs/plugin-vue'
import dotenv from 'dotenv'
import path from 'path'
import IconsResolver from 'unplugin-icons/resolver'
import Icons from 'unplugin-icons/vite'
import Components from 'unplugin-vue-components/vite'
import { Plugin, defineConfig } from 'vite'
import type { UserConfigExport } from 'vitest/config'

dotenv.config()

const IS_DEV = process.env.NODE_ENV === 'development'
const SHOULD_MINIFY = process.env.ENABLE_MINIFY === 'true'
// vite dev server will listen on all addresses, including LAN and public addresses
const VITE_REMOTE_DEV = process.env.VITE_REMOTE_DEV === 'true'

interface ShimResult {
  code: string
  exports: string[]
}

function isLegacyFile(id: string): boolean {
  return (
    id.endsWith('.ts') &&
    (id.includes('src/extensions/core') || id.includes('src/scripts'))
  )
}

function comfyAPIPlugin(): Plugin {
  return {
    name: 'comfy-api-plugin',
    transform(code: string, id: string) {
      if (IS_DEV) return null

      if (isLegacyFile(id)) {
        const result = transformExports(code, id)

        if (result.exports.length > 0) {
          const projectRoot = process.cwd()
          const relativePath = path.relative(path.join(projectRoot, 'src'), id)
          const shimFileName = relativePath.replace(/\.ts$/, '.js')

          const shimComment = `// Shim for ${relativePath}\n`

          this.emitFile({
            type: 'asset',
            fileName: shimFileName,
            source: shimComment + result.exports.join('')
          })
        }

        return {
          code: result.code,
          map: null // If you're not modifying the source map, return null
        }
      }
    }
  }
}

function transformExports(code: string, id: string): ShimResult {
  const moduleName = getModuleName(id)
  const exports: string[] = []
  let newCode = code

  // Regex to match different types of exports
  const regex =
    /export\s+(const|let|var|function|class|async function)\s+([a-zA-Z$_][a-zA-Z\d$_]*)(\s|\()/g
  let match

  while ((match = regex.exec(code)) !== null) {
    const name = match[2]
    // All exports should be bind to the window object as new API endpoint.
    if (exports.length == 0) {
      newCode += `\nwindow.comfyAPI = window.comfyAPI || {};`
      newCode += `\nwindow.comfyAPI.${moduleName} = window.comfyAPI.${moduleName} || {};`
    }
    newCode += `\nwindow.comfyAPI.${moduleName}.${name} = ${name};`
    exports.push(
      `export const ${name} = window.comfyAPI.${moduleName}.${name};\n`
    )
  }

  return {
    code: newCode,
    exports
  }
}

function getModuleName(id: string): string {
  // Simple example to derive a module name from the file path
  const parts = id.split('/')
  const fileName = parts[parts.length - 1]
  return fileName.replace(/\.\w+$/, '') // Remove file extension
}

const DEV_SERVER_COMFYUI_URL =
  process.env.DEV_SERVER_COMFYUI_URL || 'http://127.0.0.1:8188'

export default defineConfig({
  base: '',
  server: {
    host: VITE_REMOTE_DEV ? '0.0.0.0' : undefined,
    proxy: {
      '/internal': {
        target: DEV_SERVER_COMFYUI_URL
      },

      '/api': {
        target: DEV_SERVER_COMFYUI_URL,
        // Return empty array for extensions API as these modules
        // are not on vite's dev server.
        bypass: (req, res, options) => {
          if (req.url === '/api/extensions') {
            res.end(JSON.stringify([]))
          }
          return null
        }
      },

      '/ws': {
        target: DEV_SERVER_COMFYUI_URL,
        ws: true
      },

      '/workflow_templates': {
        target: DEV_SERVER_COMFYUI_URL
      },

      '/testsubrouteindex': {
        target: 'http://localhost:5173',
        rewrite: (path) => path.substring('/testsubrouteindex'.length)
      }
    }
  },

  plugins: [
    vue(),
    comfyAPIPlugin(),

    Icons({
      compiler: 'vue3'
    }),

    Components({
      dts: true,
      resolvers: [IconsResolver()],
      dirs: ['src/components', 'src/layout', 'src/views'],
      deep: true,
      extensions: ['vue']
    })
  ],

  build: {
    minify: SHOULD_MINIFY ? 'esbuild' : false,
    target: 'es2022',
    sourcemap: true,
    rollupOptions: {
      // Disabling tree-shaking
      // Prevent vite remove unused exports
      treeshake: false
    }
  },

  esbuild: {
    minifyIdentifiers: false,
    keepNames: true,
    minifySyntax: SHOULD_MINIFY,
    minifyWhitespace: SHOULD_MINIFY
  },

  test: {
    globals: true,
    environment: 'happy-dom',
    setupFiles: ['./vitest.setup.ts']
  },

  define: {
    __COMFYUI_FRONTEND_VERSION__: JSON.stringify(
      process.env.npm_package_version
    ),
    __SENTRY_ENABLED__: JSON.stringify(
      !(process.env.NODE_ENV === 'development' || !process.env.SENTRY_DSN)
    ),
    __SENTRY_DSN__: JSON.stringify(process.env.SENTRY_DSN || ''),
    __ALGOLIA_APP_ID__: JSON.stringify(process.env.ALGOLIA_APP_ID || ''),
    __ALGOLIA_API_KEY__: JSON.stringify(process.env.ALGOLIA_API_KEY || '')
  },

  resolve: {
    alias: {
      '@': '/src'
    }
  },

  optimizeDeps: {
    exclude: ['@comfyorg/litegraph', '@comfyorg/comfyui-electron-types']
  }
}) as UserConfigExport