const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!欢迎来到协议提取接口服务器')
})

app.get('/scheme', async (req, res) => {
    let copy = req.query.copy

    if(!copy){
        res.json({
            code: 500,
            error:"您缺少copy参数"
        })
        return
    }
    console.log(req.query.copy)
    let schemeURI = await copyToScheme(copy)
    res.json({
        code: 200,
        data:{
            scheme:schemeURI
        }
    })
})

app.listen(port, () => {
  console.log(`Scheme API listening on port http://127.0.0.1:${port}`)
})





async function copyToScheme(copy){
    let shopShareLink = copy
    console.log(shopShareLink)
    let link = extractLinks(shopShareLink)[0]
    console.log(link)

    let response = await fetch(link)
    // let text = await response.text()
    let meituanURL = new URL(response.url)
    console.log(meituanURL)
    let schemeURI = meituanURL.searchParams.get("url")
    console.log(schemeURI)
    return schemeURI
}


function extractLinks(text) {
    // 正则表达式匹配HTTP/HTTPS链接
    // 匹配规则：
    // - 以http://或https://开头
    // - 包含域名（字母、数字、点、下划线、连字符）
    // - 可以包含路径、查询参数和锚点
    const urlRegex = /https?:\/\/[^\s"'<>]+/g;
    
    // 执行匹配并返回结果数组
    // 如果没有找到链接，返回空数组
    return text.match(urlRegex) || [];
}