package server

import (
	"encoding/hex"
	"encoding/json"
	"fmt"
	"log"
	"m2pool-payment/internal/blockchain"
	"m2pool-payment/internal/blockchain/eth"
	"m2pool-payment/internal/crypto"
	"m2pool-payment/internal/logger"
	message "m2pool-payment/internal/msg"
	rmq "m2pool-payment/internal/queue"
	"os"
	"os/signal"
	"strings"
	"syscall"
)

const MSG_KEY string = "9f3c7a12"

// 状态码常量
const (
	STATUS_FAILED        = 0 // 失败
	STATUS_SUCCESS       = 1 // 成功
	STATUS_PENDING       = 2 // 待确认
	STATUS_VERIFY_FAILED = 3 // 验证失败
)

type ServerCtx struct {
	msgKey           string
	Config           message.Config
	blockChainServer *blockchain.BlockChainServer
	rmqServer        *rmq.RabbitMQServer
}

var s_ctx ServerCtx

// verifyMessage 验证消息签名
func verifyMessage(timestamp uint64, sign string) bool {
	hash_byte := crypto.Sha256Hash(fmt.Sprintf("%x", timestamp) + MSG_KEY)
	hash := hex.EncodeToString(hash_byte)
	return hash == sign
}

func loadConfig(msgKey string) {
	file, err := os.ReadFile("config.json")
	if err != nil {
		panic(fmt.Sprintf("读取配置文件失败: %v", err))
	}

	err = json.Unmarshal(file, &s_ctx.Config)
	if err != nil {
		panic(fmt.Sprintf("解析配置文件失败: %v", err))
	}

	log.Printf("✅ 配置加载成功: RPC=%s, WS=%s",
		s_ctx.Config.ETHConfig.RpcURL, s_ctx.Config.ETHConfig.WsURL)

	s_ctx.msgKey = msgKey
}

func initBlockChainServer() {
	// 初始化节点服务
	node_server := blockchain.NewBlockChainServer()
	// 初始化ETH节点
	eth_node, err := eth.NewETHNode(s_ctx.Config.ETHConfig, "m2pool")
	if err != nil {
		log.Fatalf("ETH-Node Start error: %v", err)
	}
	// 注册ETH节点
	node_server.RegisterChain("ETH", eth_node)
	// 将所有注册的blockChainServer绑定至server
	s_ctx.blockChainServer = node_server

	log.Println("✅ 区块链服务初始化完成")
}

func initRmqServer() {
	// 初始化rmq服务
	rmq_server, err := rmq.NewRabbitMQServer(s_ctx.Config.RMQConfig)
	if err != nil {
		log.Fatalf("RabbitMQ Server Start error: %v", err)
	}
	// 将rmq服务绑定至server
	s_ctx.rmqServer = rmq_server

	log.Printf("✅ RabbitMQ服务初始化完成: %s", s_ctx.Config.RMQConfig.SubAddr)
}

func handleTopupMsg() {
	s_ctx.rmqServer.OnTopupMsg = func(msg message.TopupMsg_req) {
		msg.Address = strings.ToLower(msg.Address)

		// 验证签名
		if !verifyMessage(msg.Timestamp, msg.Sign) {
			err := s_ctx.rmqServer.PublishTopupResp(message.TopupMsg_resp{
				Address: msg.Address,
				Status:  STATUS_VERIFY_FAILED,
				Chain:   msg.Chain,
				Symbol:  msg.Symbol,
				Amount:  0,
				TxHash:  "",
			})
			if err != nil {
				log.Printf("❌ 发布充值失败响应失败: %v", err)
			}
			return
		}

		// 添加监听地址
		s_ctx.blockChainServer.AddAddress(msg.Chain, msg.Address, msg)
	}
}

func handleWithdrawMsg() {
	s_ctx.rmqServer.OnWithdrawMsg = func(msg message.WithdrawMsg_req) {
		msg.FromAddress = strings.ToLower(msg.FromAddress)
		msg.ToAddress = strings.ToLower(msg.ToAddress)

		// 验证签名
		if !verifyMessage(msg.Timestamp, msg.Sign) {
			err := s_ctx.rmqServer.PublishWithdrawResp(message.WithdrawMsg_resp{
				QueueId: msg.QueueId,
				Status:  STATUS_VERIFY_FAILED,
				Chain:   msg.Chain,
				Symbol:  msg.Symbol,
				Amount:  0,
				TxHash:  "",
			})
			if err != nil {
				log.Printf("❌ 发布提现失败响应失败: %v", err)
			}
			return
		}

		// 执行转账
		err := s_ctx.blockChainServer.Transfer(msg.Chain, msg.Symbol, msg)
		if err != nil {
			log.Printf("❌ 提现转账失败: %v", err)
			// 发送失败响应
			s_ctx.rmqServer.PublishWithdrawResp(message.WithdrawMsg_resp{
				QueueId: msg.QueueId,
				Status:  STATUS_FAILED,
				Amount:  msg.Amount,
				Chain:   msg.Chain,
				Symbol:  msg.Symbol,
				TxHash:  "",
			})
		}
	}
}

func handlePayMsg() {
	s_ctx.rmqServer.OnPayMsg = func(msg message.PayMsg_req) {
		msg.FromAddress = strings.ToLower(msg.FromAddress)
		msg.ToAddress = strings.ToLower(msg.ToAddress)

		// 验证签名
		if !verifyMessage(msg.Timestamp, msg.Sign) {
			err := s_ctx.rmqServer.PublishPayResp(message.PayMsg_resp{
				QueueId: msg.QueueId,
				Status:  STATUS_VERIFY_FAILED,
				Amount:  msg.Amount,
				Chain:   msg.Chain,
				Symbol:  msg.Symbol,
				OrderId: msg.OrderId,
				TxHash:  "",
			})
			if err != nil {
				log.Printf("❌ 发布支付失败响应失败: %v", err)
			}
			return
		}

		// 执行转账
		err := s_ctx.blockChainServer.Transfer(msg.Chain, msg.Symbol, msg)
		if err != nil {
			log.Printf("❌ 支付转账失败: %v", err)
			// 发送失败响应
			s_ctx.rmqServer.PublishPayResp(message.PayMsg_resp{
				QueueId: msg.QueueId,
				Status:  STATUS_FAILED,
				Amount:  msg.Amount,
				Chain:   msg.Chain,
				Symbol:  msg.Symbol,
				OrderId: msg.OrderId,
				TxHash:  "",
			})
		}
	}
}

func initRmqListen() {
	// ================== 设置 RabbitMQ 消息处理回调 ==================
	// 先设置所有回调（同步执行，避免竞态）
	handleTopupMsg()
	handleWithdrawMsg()
	handlePayMsg()

	// 回调设置完成后，再启动 RabbitMQ 监听
	if err := s_ctx.rmqServer.Start(); err != nil {
		log.Fatalf("启动 RabbitMQ 监听失败: %v", err)
	}
	log.Println("✅ RabbitMQ 监听启动完成")
}

func handleChainEvent(chainEventCh chan any) {
	for event := range chainEventCh {
		// 添加 panic 恢复，防止单个消息处理错误导致整个 goroutine 退出
		func() {
			defer func() {
				if r := recover(); r != nil {
					log.Printf("❌ 处理链上事件 panic: %v, event: %+v", r, event)
				}
			}()

			// 根据消息类型发送不同的响应
			switch msg := event.(type) {
			case message.TopupMsg_resp:
				// 充值确认
				if msg.Status == STATUS_PENDING {
					log.Printf("📨 [链上] 充值待确认: Address=%s, Amount=%.2f, TxHash=%s",
						msg.Address, msg.Amount, msg.TxHash)
					// 记录交易日志：待确认
					logger.LogTopup(msg.Address, "待确认", msg.Amount, msg.TxHash, msg.BlockHeight)
				} else {
					log.Printf("✅ [链上] 充值确认: Address=%s, Amount=%.2f, TxHash=%s, Status=%d",
						msg.Address, msg.Amount, msg.TxHash, msg.Status)
					// 记录交易日志：已确认
					logger.LogTopup(msg.Address, "确认", msg.Amount, msg.TxHash, msg.BlockHeight)
				}
				err := s_ctx.rmqServer.PublishTopupResp(msg)
				if err != nil {
					log.Printf("❌ 发送充值响应失败: %v", err)
				}

			case message.WithdrawMsg_resp:
				// 提现确认
				log.Printf("✅ [链上] 提现确认: QueueId=%s, Amount=%.2f, TxHash=%s, Status=%d",
					msg.QueueId, msg.Amount, msg.TxHash, msg.Status)
				// 记录交易日志
				logger.LogWithdraw(msg.QueueId, "确认", msg.Amount, msg.FromAddress,
					msg.ToAddress, msg.TxHash, msg.BlockHeight)
				err := s_ctx.rmqServer.PublishWithdrawResp(msg)
				if err != nil {
					log.Printf("❌ 发送提现响应失败: %v", err)
				}

			case message.PayMsg_resp:
				// 支付确认
				log.Printf("✅ [链上] 支付确认: QueueId=%s, OrderId=%s, Amount=%.2f, TxHash=%s, Status=%d",
					msg.QueueId, msg.OrderId, msg.Amount, msg.TxHash, msg.Status)
				// 记录交易日志
				logger.LogPay(msg.OrderId, msg.QueueId, "确认", msg.Amount, msg.FromAddress,
					msg.ToAddress, msg.TxHash, msg.BlockHeight)
				err := s_ctx.rmqServer.PublishPayResp(msg)
				if err != nil {
					log.Printf("❌ 发送支付响应失败: %v", err)
				}

			default:
				log.Printf("⚠️ 未知消息类型: %T", event)
			}
		}()
	}
}

func Start(msgKey string) {
	log.Println("========================================")
	log.Println("🚀 M2Pool Payment System Starting...")
	log.Println("========================================")

	// 加载配置
	loadConfig(msgKey)

	// 初始化交易日志系统
	if err := logger.InitTransactionLogger("logs"); err != nil {
		log.Fatalf("❌ 初始化交易日志系统失败: %v", err)
	}
	log.Println("✅ 交易日志系统初始化完成")

	// ================== 初始化区块链节点 ==================
	initBlockChainServer()

	// ================== 初始化 RabbitMQ 服务 ==================
	initRmqServer()

	// ================== 启动链上事件监听通道 ==================
	chainEventCh := make(chan any, 1000) // 增加缓冲区，避免高并发丢消息
	go s_ctx.blockChainServer.Listen("ETH", "USDT", chainEventCh)

	// ================== 启动 RabbitMQ 监听 ==================
	initRmqListen()

	// ================== 处理链上确认事件 ==================
	go handleChainEvent(chainEventCh)

	log.Println("========================================")
	log.Println("🎉 所有服务启动完成！")
	log.Println("========================================")
	// ================== 等待退出信号 ==================
	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
	<-sigCh

	// 优雅关闭
	log.Println("========================================")
	log.Println("🛑 收到退出信号，正在关闭服务...")
	log.Println("========================================")

	s_ctx.blockChainServer.Stop("ETH")
	s_ctx.rmqServer.Close()
	logger.CloseTransactionLogger()

	log.Println("👋 服务已全部关闭")
}