// 从 @iconify-json/ph 与 @iconify-json/solar 中抽取项目实际用到的图标，
// 生成一个精简的 iconify 数据文件，供 weapp-svg-icon 组件使用，避免全量打包。
import { readFile, readdir, writeFile } from 'node:fs/promises'
import path from 'node:path'
import { fileURLToPath } from 'node:url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const root = path.resolve(__dirname, '..')

const SRC_DIR = path.join(root, 'src')
const PKG_DIR = path.join(root, 'node_modules', 'weapp-svg-icon')
const OUTPUT = path.join(PKG_DIR, 'miniprogram_dist', 'index.js')

const ICON_PREFIXES = ['ph', 'solar']
const ICON_RE = /(?:^|[^\w])(ph|solar):([a-z0-9-]+)/g
const SCAN_EXTENSIONS = new Set(['.ts', '.js', '.wxml', '.vue', '.json'])

async function walk(dir) {
  const entries = await readdir(dir, { withFileTypes: true })
  const files = []
  for (const entry of entries) {
    if (entry.name === 'node_modules' || entry.name.startsWith('.')) continue
    const full = path.join(dir, entry.name)
    if (entry.isDirectory()) files.push(...(await walk(full)))
    else files.push(full)
  }
  return files
}

async function collectUsedIcons() {
  const files = await walk(SRC_DIR)
  const used = new Set()
  for (const file of files) {
    if (!SCAN_EXTENSIONS.has(path.extname(file))) continue
    const content = await readFile(file, 'utf8')
    for (const match of content.matchAll(ICON_RE)) {
      used.add(`${match[1]}:${match[2]}`)
    }
  }
  return [...used].sort()
}

async function loadIconifyJson(packageName) {
  const p = path.join(root, 'node_modules', '@iconify-json', packageName, 'icons.json')
  return JSON.parse(await readFile(p, 'utf8'))
}

async function main() {
  const used = await collectUsedIcons()
  const byPrefix = { ph: new Set(), solar: new Set() }
  for (const id of used) {
    const [prefix, icon] = id.split(':')
    byPrefix[prefix]?.add(icon)
  }

  const sets = {}
  const svgNameSwitch = (id) =>
    id
      .split(/:|-|_/)
      .filter(Boolean)
      .map((s) => s[0].toUpperCase() + s.slice(1).toLowerCase())
      .join('')
  for (const prefix of ICON_PREFIXES) {
    const source = await loadIconifyJson(prefix)
    const icons = {}
    for (const icon of [...byPrefix[prefix]].sort()) {
      if (source.icons[icon]) icons[icon] = source.icons[icon]
    }
    sets[svgNameSwitch(prefix)] = {
      prefix: source.prefix ?? prefix,
      width: source.width,
      height: source.height,
      icons,
    }
  }

  const template = `// Generated by scripts/generate-svg-icons.mjs — DO NOT EDIT.
// Minimal iconify data extracted from @iconify-json/ph + @iconify-json/solar.
var iconifyPresets = ${JSON.stringify(sets)}

function svgNameSwitch(id) {
  return id
    .split(/:|-|_/)
    .filter(Boolean)
    .map(function (s) {
      return s[0].toUpperCase() + s.slice(1).toLowerCase()
    })
    .join('')
}

function encodeSvg(svg) {
  return svg
    .replace('<svg', ~svg.indexOf('xmlns') ? '<svg' : '<svg xmlns="http://www.w3.org/2000/svg"')
    .replace(/"/g, "'")
    .replace(/%/g, '%25')
    .replace(/#/g, '%23')
    .replace(/{/g, '%7B')
    .replace(/}/g, '%7D')
    .replace(/</g, '%3C')
    .replace(/>/g, '%3E')
}

function getDataUri(data) {
  return 'url("data:image/svg+xml;utf8,' + data + '")'
}

function presetsIconify(id) {
  var parts = id.split(':')
  var prefix = ''
  var icon = ''
  if (parts.length === 2) {
    prefix = svgNameSwitch(parts[0])
    icon = parts[1]
  } else if (parts.length === 1) {
    parts = parts[0].split('-')
    if (parts.length > 1) {
      prefix = svgNameSwitch(parts.shift())
      icon = parts.join('-')
    }
  }
  var setData = iconifyPresets[prefix] || null
  var width = setData && setData.width ? setData.width : 32
  var height = setData && setData.height ? setData.height : 32
  var iconData = setData && setData.icons && setData.icons[icon] ? setData.icons[icon] : null
  if (!iconData) {
    return ''
  }
  var svgAttributes = {
    xmlns: 'http://www.w3.org/2000/svg',
    'xmlns:xlink': 'http://www.w3.org/1999/xlink',
    width: '1em',
    height: '1em',
    preserveAspectRatio: 'xMidYMid meet',
    viewBox: '0 0 ' + width + ' ' + height
  }
  var svgAttributesStr = Object.keys(svgAttributes)
    .map(function (attr) {
      return attr + '="' + svgAttributes[attr] + '"'
    })
    .join(' ')
  return '<svg ' + svgAttributesStr + '>' + iconData.body + '</svg>'
}

function getLocalSVG(id) {
  var name = svgNameSwitch(id)
  var data = presetsIconify(id)
  if (data) {
    return getDataUri(encodeSvg(data))
  }
  data = wx.getStorageSync(name)
  if (data) {
    return getDataUri(data)
  }
  return ''
}

Component({
  properties: {
    name: {
      type: String,
      value: ''
    },
    color: {
      type: String,
      value: ''
    },
    size: {
      type: String
    }
  },
  data: {
    width: '1em',
    height: '1em',
    iconUrl: '',
    class: ''
  },
  lifetimes: {
    attached: function attached() {
      this.setData({
        iconUrl: getLocalSVG(this.data.name),
        class: this.data.color ? 'icon' : 'default-icon'
      })
      if (this.data.size) {
        this.setData({
          width: this.data.size,
          height: this.data.size
        })
      }
    }
  }
})
`

  await writeFile(OUTPUT, template, 'utf8')
  console.log(`generated ${path.relative(root, OUTPUT)} with ${used.length} icons`)
  console.log(used.join('\n'))
}

main().catch((err) => {
  console.error(err)
  process.exit(1)
})