import MarkdownIt from "markdown-it";
import type { RenderRule } from "markdown-it/lib/renderer.mjs";
import type Token from "markdown-it/lib/token.mjs";
import type { Options } from "markdown-it/lib/index.mjs";
import type Renderer from "markdown-it/lib/renderer.mjs";
import * as echarts from 'echarts'

class EChartsElement extends HTMLDivElement {
  instance!: echarts.ECharts
  private resizeHandler!: () => void

  connectedCallback() {
    const config = decodeURIComponent(this.getAttribute('config') ?? '') ?? '';
    let data: echarts.EChartsOption
    try {
      data = JSON.parse(config)
    } catch (e) {
      console.error(e)
      return
    }
    this.instance = echarts.init(this)
    this.instance.setOption(data)

    // 创建绑定了正确上下文的 resize 处理器
    this.resizeHandler = () => {
      this.instance?.resize()
    }

    window.addEventListener('resize', this.resizeHandler)
  }

  disconnectedCallback() {
    // 清理 resize 事件监听器
    if (this.resizeHandler) {
      window.removeEventListener('resize', this.resizeHandler)
    }

    // 销毁 ECharts 实例
    if (this.instance) {
      this.instance.dispose()
    }
  }
}


export type EchartsPluginOptions = {
}

// 生成唯一ID
function generateId(): string {
  return 'echarts-' + Math.random().toString(36).substring(2, 9)
}

// 验证JSON格式
function isValidJSON(str: string): boolean {
  try {
    JSON.parse(str)
    return true
  } catch {
    return false
  }
}

// 渲染echarts代码块
const renderEcharts: RenderRule = (tokens: Token[], idx: number, _options: Options, env: any, _self: Renderer) => {
  const token = tokens[idx]
  const content = token.content.trim()

  if (!content) {
    return '<div style="padding: 16px;background-color: #fff5f5;border: 1px solid #fed7d7;border-radius: 6px;color: #c53030;margin: 16px 0;">ECharts配置不能为空</div>'
  }

  const id = generateId()
  const className = env.echartsClassName || 'echarts-container'
  // 生成完整HTML
  return `<div is="echarts-container" style="width: 100%;height: 350px;margin: 16px 0; border-radius: 6px"  class="${className}" id="${id}" config="${encodeURIComponent(content)}"></div>`
}

// markdown-it插件
//@ts-ignore
// eslint-disable-next-line no-unused-vars
function echartsPlugin(md: MarkdownIt, options: EchartsPluginOptions = {}) {
  // 保存原始的fence渲染器
  const defaultRender = md.renderer.rules.fence ?? function(tokens, idx, options, _env, renderer) {
    return renderer.renderToken(tokens, idx, options)
  }

  if (customElements.get('echarts-container') === undefined) {
    customElements.define('echarts-container', EChartsElement, { extends: 'div' })
  }

  // 重写fence渲染器
  md.renderer.rules.fence = function(tokens, idx, options, env, renderer) {
    const token = tokens[idx]
    const info = token.info ? token.info.trim() : ''

    // 检查是否是echarts代码块
    if (info === 'echarts' && isValidJSON(token.content.trim())) {
      console.log(`prepare renderer`,tokens,idx,options,env,renderer,tokens[idx])
      return renderEcharts(tokens, idx, options, env, renderer)
    }

    // 其他代码块使用默认渲染器
    return defaultRender(tokens, idx, options, env, renderer)
  }
}

export default echartsPlugin