<template>
  <el-color-picker
    v-model="theme"
    :predefine="['#409EFF', '#11a983', '#13c2c2', '#6959CD', '#f5222d', '#eb2f96', '#DB7093', '#e6a23c', '#8B8989', '#212121']"
    class="theme-picker"
    popper-class="theme-picker-dropdown"
  />
</template>

<script>

const version = require('element-ui/package.json').version // element-ui version from node_modules
const ORIGINAL_THEME = '#409EFF' // default color
// const ORIGINAL_THEME = '#AAAAAA' // default color

export default {
  data() {
    return {
      chalk: '', // content of theme-chalk css
      theme: ORIGINAL_THEME
    }
  },
  watch: {
    theme(val) {
      const oldVal = this.theme
      if (typeof val !== 'string') return
      const themeCluster = this.getThemeCluster(val.replace('#', ''))
      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
      const getHandler = (variable, id) => {
        return () => {
          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)

          let styleTag = document.getElementById(id)
          if (!styleTag) {
            styleTag = document.createElement('style')
            styleTag.setAttribute('id', id)
            document.head.appendChild(styleTag)
          }
          styleTag.innerText = newStyle
        }
      }

      const chalkHandler = getHandler('chalk', 'chalk-style')

      if (!this.chalk) {
        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
        this.getCSSString(url, chalkHandler, 'chalk')
      } else {
        chalkHandler()
      }

      const styles = [].slice.call(document.querySelectorAll('style'))
        .filter(style => {
          const text = style.innerText
          return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
        })
      styles.forEach(style => {
        const { innerText } = style
        if (typeof innerText !== 'string') return
        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
      })
      this.$message({
        message: '换肤成功',
        type: 'success'
      })
    }
  },

  methods: {
    updateStyle(style, oldCluster, newCluster) {
      const colorOverrides = [] // only capture color overides
      oldCluster.forEach((color, index) => {
        const value = newCluster[index]
        const color_plain = color.replace(/([()])/g, '\\$1')
        const repl = new RegExp(`(^|})([^{]+{[^{}]+)${color_plain}\\b([^}]*)(?=})`, 'gi')
        const nestRepl = new RegExp(color_plain, 'ig') // for greed matching before the 'color'
        console.log(repl.exec(style))
        let v
        while ((v = repl.exec(style))) {
          colorOverrides.push(v[2].replace(nestRepl, value) + value + v[3] + '}') // '}' not captured in the regexp repl to reserve it as locator-boundary
        }
      })
      return colorOverrides.join('')
    },

    getCSSString(url, callback, variable) {
      const xhr = new XMLHttpRequest()
      xhr.onreadystatechange = () => {
        if (xhr.readyState === 4 && xhr.status === 200) {
          this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
          callback()
        }
      }
      xhr.open('GET', url)
      xhr.send()
    },

    getThemeCluster(theme) {
      const tintColor = (color, tint) => {
        let red = parseInt(color.slice(0, 2), 16)
        let green = parseInt(color.slice(2, 4), 16)
        let blue = parseInt(color.slice(4, 6), 16)

        if (tint === 0) { // when primary color is in its rgb space
          return [red, green, blue].join(',')
        } else {
          red += Math.round(tint * (255 - red))
          green += Math.round(tint * (255 - green))
          blue += Math.round(tint * (255 - blue))

          red = red.toString(16)
          green = green.toString(16)
          blue = blue.toString(16)

          return `#${red}${green}${blue}`
        }
      }

      const shadeColor = (color, shade) => {
        let red = parseInt(color.slice(0, 2), 16)
        let green = parseInt(color.slice(2, 4), 16)
        let blue = parseInt(color.slice(4, 6), 16)

        red = Math.round((1 - shade) * red)
        green = Math.round((1 - shade) * green)
        blue = Math.round((1 - shade) * blue)

        red = red.toString(16)
        green = green.toString(16)
        blue = blue.toString(16)

        return `#${red}${green}${blue}`
      }

      const clusters = [theme]
      for (let i = 0; i <= 9; i++) {
        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
      }
      clusters.push(shadeColor(theme, 0.1))
      return clusters
    }
  }
}
</script>

<style>
.theme-picker .el-color-picker__trigger {
  margin-top: 12px;
  height: 26px!important;
  width: 26px!important;
  padding: 2px;
}

.theme-picker-dropdown .el-color-dropdown__link-btn {
  display: none;
}
</style>
