const path = require('path')
const db = require("../plugin/DataBase/db")
const Logger = require('./Logger')
const ipSearcher = require('../plugin/ip2region')

class RequestLog {
    constructor() {
        this.logger = new Logger()
        this.searcher = ipSearcher.newWithFileOnly(path.join(__dirname, '../plugin/ip2region/ip2region.xdb'))
    }

    async insertLog(req, resData, namespace, method, path) {
        try {
            const time = new Date().getTime()
            const ip = this.getClientIp(req)
            let ipData = await this.searcher.search(ip)
            ipData = ipData.region

            const userAgent = req.headers['user-agent']
            const deviceType = req.headers['device-type'] ?? '浏览器'

            let reqData
            if (method === 'get') {
                reqData = req.query
            } else {
                reqData = req.body
            }

            let sql = 'INSERT INTO requestLog (create_user, create_time, method, reqData, resData, code, ip, ua, deviceType, apiName, location, url) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'
            let r = await db.query(sql, [reqData.uuid ?? '', time, method, reqData ?? {}, resData, resData.code, ip, userAgent, deviceType, namespace ?? '未知', ipData ?? '未知', path])
            if (!r || r.affectedRows !== 1)
                this.logger.error(`插入日志信息失败！数据库错误`)
        } catch (error) {
            this.logger.error(`插入日志信息失败！${error}`)
        }
    }

    getClientIp(req) {
        let ip = null

        if (req.headers['x-forwarded-for']) {
            ip = req.headers['x-forwarded-for'].split(',')[0].trim();
        } else if (req.headers['x-real-ip']) {
            ip = req.headers['x-real-ip'];
        } else {
            ip = req.connection.remoteAddress || ''
        }

        // 如果是 IPv6 映射的 IPv4 (::ffff:x.x.x.x)，提取后面的 IPv4
        if (ip.startsWith("::ffff:")) {
            ip = ip.replace("::ffff:", "")
        }

        // 如果是 [::1] 或其他 IPv6
        const ipv4Regex = /^(\d{1,3}\.){3}\d{1,3}$/
        if (!ipv4Regex.test(ip)) {
            return '0.0.0.0'; // 非 IPv4
        }

        return ip ?? '0.0.0.0';
    }

}

module.exports = RequestLog