const express = require('express')
const cors = require('cors')
const path = require('path')
const fs = require('fs')
const config = require('../config.json')
const Logger = require('./Logger')
const MySQL = require('../plugin/DataBase/MySQL')
const Worker = require('./Lepao/Worker')
const mq = require('../plugin/mq')

class SERVER {
    constructor() {
        this.app = express()
        this.port = config.port || 3000
        this.apiDirectory = path.join(__dirname, '../apis') // API 文件存放目录

        this.logger = new Logger(path.join(__dirname, '../logs/Server.log'), 'INFO')

        // 解析 JSON 请求体
        this.app.use(express.json())

        //解决cors跨域
        this.app.use(cors())

        //使用静态资源
        this.app.use('/uploads', express.static('./uploads'))
        this.app.use('/models', express.static('./models'))

        // 初始化数据库连接
        this.db = new MySQL()

        // 加载 API 路由
        this.loadAPIs(this.apiDirectory)
    }

    // 测试数据库连接
    async initDB() {
        try {
            this.logger.info('正在测试数据库连接')
            await this.db.connect()
            await this.db.close()
        } catch (error) {
            this.logger.error(`数据库连接失败: ${error.stack}`)
            process.exit(1)
        }
    }

    // 测试MQ连接
    async initMQ() {
        try {
            await mq.init()
            const ch = await mq.getChannel('health')

            await ch.assertQueue('mq_health_check', { durable: false })
            this.logger.info('✅ RabbitMQ 初始化 & 测试成功')

            const worker = new Worker()
            try {
                await worker.start()
                this.logger.info('RunForge Worker 已启动，正在监听 MQ 任务...')
            } catch (err) {
                console.error('RunForge Worker 启动失败:', err)
                process.exit(1)
            }
        } catch (e) {
            this.logger.error('❌ RabbitMQ 初始化失败')
            process.exit(1)
        }
    }

    loadAPIs(directory) {
        const items = fs.readdirSync(directory)

        items.forEach(item => {
            const itemPath = path.join(directory, item)
            const stats = fs.statSync(itemPath)

            if (stats.isDirectory()) {
                // 如果是目录，递归调用
                this.loadAPIs(itemPath)
            } else if (stats.isFile() && itemPath.endsWith('.js')) {
                // 如果是文件且是 JavaScript 文件
                this.loadAPIFile(itemPath)
            }
        })
    }

    // 加载单个 API 文件
    loadAPIFile(filePath) {
        try {
            const APIClass = require(filePath)

            for (const key in APIClass) {
                if (APIClass.hasOwnProperty(key)) {
                    const apiInstance = new APIClass[key]()
                    apiInstance.setupRoute()
                    this.app.use('/', apiInstance.getRouter())
                    this.logger.info(`已加载API：${apiInstance.path} 类型：${apiInstance.method}`)
                }
            }
        } catch (error) {
            this.logger.error(`加载API文件失败: ${filePath}，错误: ${error.stack}`)
        }
    }

    start() {
        this.logger.info('============正在启动服务器============')

        // 初始化数据库连接
        this.initDB().then(() => {
            this.initMQ().then(() => {
                this.app.listen(this.port, () => {
                    this.logger.info(`==========服务器正在 ${this.port} 端口上运行==========`)
                })
            }).catch(err => {
                this.logger.error(`启动服务器失败: ${err.message}`)
            })
        }).catch(err => {
            this.logger.error(`启动服务器失败: ${err.message}`)
            process.exit(1) // 启动失败时退出进程
        })
    }
}

module.exports = SERVER