//go:build ignore
// +build ignore

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	"os"
	"sync/atomic"
	"time"
)

// 统计计数器
var (
	totalRequests   int64
	successRequests int64
	failedRequests  int64
	startTime       time.Time
	fastMode        bool // 快速模式：低延迟
)

// GatewayResponse 模拟网关响应
type GatewayResponse struct {
	Code    int             `json:"code"`
	Msg     string          `json:"msg"`
	TraceID string          `json:"traceId"`
	Data    json.RawMessage `json:"data"`
}

func main() {
	startTime = time.Now()
	rand.Seed(time.Now().UnixNano())

	// 检查是否启用快速模式
	if os.Getenv("FAST_MODE") == "1" || os.Getenv("FAST_MODE") == "true" {
		fastMode = true
		fmt.Println("⚡ 快速模式已启用（延迟: 10-50ms）")
	} else {
		fmt.Println("🐢 真实模式（延迟: 200ms-4s）")
		fmt.Println("   提示: 设置 FAST_MODE=1 可启用快速模式")
	}

	// 实名查询接口（匹配 gateway client 的路径）
	http.HandleFunc("/flow-card/realName", handleRealnameQuery)

	// 流量查询接口
	http.HandleFunc("/flow-card/flow", handleFlowQuery)

	// 停机接口
	http.HandleFunc("/flow-card/cardStop", handleStopCard)

	// 复机接口
	http.HandleFunc("/flow-card/cardStart", handleStartCard)

	// 卡状态查询接口
	http.HandleFunc("/flow-card/status", handleCardStatus)

	// 统计接口
	http.HandleFunc("/stats", handleStats)

	fmt.Println("=== Mock Gateway 服务器启动 ===")
	fmt.Println("监听端口: 8888")
	fmt.Println("模拟响应时间: 200ms - 4s")
	fmt.Println("")
	fmt.Println("接口列表:")
	fmt.Println("  POST /flow-card/realName - 实名查询")
	fmt.Println("  POST /flow-card/flow - 流量查询")
	fmt.Println("  POST /flow-card/status - 卡状态查询")
	fmt.Println("  POST /flow-card/cardStop - 停机操作")
	fmt.Println("  POST /flow-card/cardStart - 复机操作")
	fmt.Println("  GET  /stats - 查看统计")
	fmt.Println("")
	fmt.Println("按 Ctrl+C 停止服务器")

	log.Fatal(http.ListenAndServe(":8888", nil))
}

// simulateLatency 模拟网络延迟
func simulateLatency() {
	var delay time.Duration

	if fastMode {
		// 快速模式：10-50ms
		delay = time.Duration(10+rand.Intn(40)) * time.Millisecond
	} else {
		// 真实模式：200ms - 4s
		// 80% 概率 200-500ms（正常）
		// 15% 概率 500ms-2s（较慢）
		// 5% 概率 2s-4s（很慢）
		r := rand.Float64()
		if r < 0.80 {
			delay = time.Duration(200+rand.Intn(300)) * time.Millisecond
		} else if r < 0.95 {
			delay = time.Duration(500+rand.Intn(1500)) * time.Millisecond
		} else {
			delay = time.Duration(2000+rand.Intn(2000)) * time.Millisecond
		}
	}

	time.Sleep(delay)
}

// handleRealnameQuery 处理实名查询
func handleRealnameQuery(w http.ResponseWriter, r *http.Request) {
	atomic.AddInt64(&totalRequests, 1)
	simulateLatency()

	// 90% 成功，10% 失败
	if rand.Float64() < 0.90 {
		atomic.AddInt64(&successRequests, 1)
		// 随机返回实名状态（匹配文档：realStatus 为 bool 类型）
		realStatus := rand.Float64() < 0.5
		resp := GatewayResponse{
			Code:    200,
			Msg:     "success",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
			Data:    json.RawMessage(fmt.Sprintf(`{"iccid": "mock-iccid", "realStatus": %t}`, realStatus)),
		}
		json.NewEncoder(w).Encode(resp)
	} else {
		atomic.AddInt64(&failedRequests, 1)
		resp := GatewayResponse{
			Code:    500,
			Msg:     "upstream error",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
		}
		json.NewEncoder(w).Encode(resp)
	}
}

// handleFlowQuery 处理流量查询
func handleFlowQuery(w http.ResponseWriter, r *http.Request) {
	atomic.AddInt64(&totalRequests, 1)
	simulateLatency()

	if rand.Float64() < 0.90 {
		atomic.AddInt64(&successRequests, 1)
		// 随机返回流量数据（匹配文档：used 字段）
		usedFlow := rand.Intn(10000)
		resp := GatewayResponse{
			Code:    200,
			Msg:     "success",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
			Data:    json.RawMessage(fmt.Sprintf(`{"iccid": "mock-iccid", "used": %d, "unit": "MB"}`, usedFlow)),
		}
		json.NewEncoder(w).Encode(resp)
	} else {
		atomic.AddInt64(&failedRequests, 1)
		resp := GatewayResponse{
			Code:    500,
			Msg:     "upstream error",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
		}
		json.NewEncoder(w).Encode(resp)
	}
}

// handleStopCard 处理停机操作
func handleStopCard(w http.ResponseWriter, r *http.Request) {
	atomic.AddInt64(&totalRequests, 1)
	simulateLatency()

	if rand.Float64() < 0.95 {
		atomic.AddInt64(&successRequests, 1)
		resp := GatewayResponse{
			Code:    200,
			Msg:     "success",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
			Data:    json.RawMessage(`{"result": "stopped"}`),
		}
		json.NewEncoder(w).Encode(resp)
	} else {
		atomic.AddInt64(&failedRequests, 1)
		resp := GatewayResponse{
			Code:    500,
			Msg:     "stop failed",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
		}
		json.NewEncoder(w).Encode(resp)
	}
}

// handleStartCard 处理复机操作
func handleStartCard(w http.ResponseWriter, r *http.Request) {
	atomic.AddInt64(&totalRequests, 1)
	simulateLatency()

	if rand.Float64() < 0.95 {
		atomic.AddInt64(&successRequests, 1)
		resp := GatewayResponse{
			Code:    200,
			Msg:     "success",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
			Data:    json.RawMessage(`{"result": "started"}`),
		}
		json.NewEncoder(w).Encode(resp)
	} else {
		atomic.AddInt64(&failedRequests, 1)
		resp := GatewayResponse{
			Code:    500,
			Msg:     "start failed",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
		}
		json.NewEncoder(w).Encode(resp)
	}
}

// handleCardStatus 处理卡状态查询
func handleCardStatus(w http.ResponseWriter, r *http.Request) {
	atomic.AddInt64(&totalRequests, 1)
	simulateLatency()

	if rand.Float64() < 0.90 {
		atomic.AddInt64(&successRequests, 1)
		// 随机返回卡状态：1-正常，0-停机
		cardStatus := rand.Intn(2)
		resp := GatewayResponse{
			Code:    200,
			Msg:     "success",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
			Data:    json.RawMessage(fmt.Sprintf(`{"status": %d}`, cardStatus)),
		}
		json.NewEncoder(w).Encode(resp)
	} else {
		atomic.AddInt64(&failedRequests, 1)
		resp := GatewayResponse{
			Code:    500,
			Msg:     "query failed",
			TraceID: fmt.Sprintf("trace-%d", time.Now().UnixNano()),
		}
		json.NewEncoder(w).Encode(resp)
	}
}

// handleStats 返回统计信息
func handleStats(w http.ResponseWriter, r *http.Request) {
	elapsed := time.Since(startTime).Seconds()
	total := atomic.LoadInt64(&totalRequests)
	success := atomic.LoadInt64(&successRequests)
	failed := atomic.LoadInt64(&failedRequests)

	qps := float64(total) / elapsed
	successRate := float64(0)
	if total > 0 {
		successRate = float64(success) * 100 / float64(total)
	}

	stats := map[string]interface{}{
		"uptime_seconds": elapsed,
		"total_requests": total,
		"success_count":  success,
		"failed_count":   failed,
		"qps":            qps,
		"success_rate":   fmt.Sprintf("%.2f%%", successRate),
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(stats)
}