/**
 * @description: 注册svg图标
 */
import { readdirSync, readFileSync } from 'node:fs'
import { join } from 'node:path'

import type { RsbuildPlugin } from '@rsbuild/core'

export type SvgSpriteLoaderOptions = {
  path: string
  // default: icon-[name]
  symbolId?: string
}

// 正则表达式定义
const svgTitle = /<svg([^>]*)>/
const clearHeightWidth = /(width|height)="([^"]*)"/g
const hasViewBox = /viewBox="[^"]*"/
const clearReturn = /[\r\n]/g

// 查找并处理 SVG 文件
function svgFind(directoryPath: string, idPrefix: string): string[] {
  const svgs: string[] = []
  const directs = readdirSync(directoryPath, { withFileTypes: true })

  for (const dirent of directs) {
    if (dirent.isDirectory()) {
      svgs.push(...svgFind(join(directoryPath, dirent.name, '/'), idPrefix))
    } else if (dirent.name.endsWith('.svg')) {
      const svgContent = readFileSync(join(directoryPath, dirent.name), 'utf-8')
        .replace(clearReturn, '')
        .replace(svgTitle, ($1, $2: string) => {
          let width = 0
          let height = 0
          let content = $2.replace(
            clearHeightWidth,
            (match: string, prop: string, value: number) => {
              if (prop === 'width') width = value
              else if (prop === 'height') height = value
              return '' // 移除匹配的宽度和高度属性
            },
          )

          // 添加 viewBox 属性，如果不存在
          if (!hasViewBox.test(content)) {
            content += `viewBox="0 0 ${width} ${height}"`
          }

          const name = idPrefix.replace(
            '[name]',
            dirent.name.replace('.svg', ''),
          )
          return `<symbol id="${name}" ${content}>`
        })
        .replace('</svg>', '</symbol>')
        .replaceAll('prefix_', () => {
          return idPrefix.replace('[name]', dirent.name.replace('.svg', ''))
        })

      svgs.push(svgContent)
    }
  }

  return svgs
}

// 创建 SVG 字符串
function createSvg(path: string, prefix: string): string {
  if (path === '') return ''

  const res = svgFind(path, prefix)

  return res.join('')
}

export const pluginSvgSpriteLoader = (
  options: SvgSpriteLoaderOptions,
): RsbuildPlugin => ({
  name: 'plugin-svg-sprite-loader',

  setup(api) {
    const str = createSvg(options.path, options.symbolId || 'icon-[name]')
    api.modifyRsbuildConfig((config) => {
      // 监听svg文件夹的变化
      const watchFilesConfig = {
        type: 'reload-server' as any,
        paths: [options.path],
      }

      if (config.dev)
        if (Array.isArray(config.dev?.watchFiles)) {
          config.dev.watchFiles.push(watchFilesConfig)
        } else {
          config.dev.watchFiles = [watchFilesConfig]
        }
    })

    api.modifyHTMLTags(({ headTags, bodyTags }) => {
      bodyTags.unshift({
        tag: 'svg',
        attrs: {
          xmlns: 'http://www.w3.org/2000/svg',
          'xmlns:xlink': 'http://www.w3.org/1999/xlink',
          style: 'position: absolute; width: 0; height: 0',
        },
        children: str,
      })

      return { headTags, bodyTags }
    })
  },
})