package main

import (
	"bytes"
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"math/rand"
	"net/http"
	"os"
	"sort"
	"sync"
	"sync/atomic"
	"time"
)

// 改进的压力测试工具 - 支持真实认证、梯度压测、详细统计

type TestConfig struct {
	BaseURL     string
	Scenario    string
	Duration    time.Duration
	Concurrency int
	Gradual     bool
	WarmupUsers int
}

type TestResult struct {
	TotalRequests   int64
	SuccessRequests int64
	FailedRequests  int64
	Latencies       []int64 // 存储所有延迟用于百分位计算
	Errors          map[string]int64
	mu              sync.Mutex
}

type AuthPool struct {
	tokens []string
	mu     sync.RWMutex
}

type AdminToken struct {
	token     string
	expiresAt time.Time
	mu        sync.RWMutex
}

// 可用商品ID池
type ListingIDPool struct {
	ids []int
	mu  sync.RWMutex
}

var globalListingIDs *ListingIDPool

var (
	baseURL     = flag.String("url", "http://localhost:8080", "API 基础地址")
	concurrency = flag.Int("c", 50, "并发数")
	duration    = flag.Int("d", 60, "测试时长（秒）")
	scenario    = flag.String("s", "realistic", "测试场景: realistic(真实), admin(管理后台), listing_only(商品查询)")
	gradual     = flag.Bool("gradual", false, "启用梯度压测")
	warmupUsers = flag.Int("warmup", 100, "预热用户数（生成token）")
)

func main() {
	flag.Parse()

	config := TestConfig{
		BaseURL:     *baseURL,
		Scenario:    *scenario,
		Duration:    time.Duration(*duration) * time.Second,
		Concurrency: *concurrency,
		Gradual:     *gradual,
		WarmupUsers: *warmupUsers,
	}

	fmt.Printf("=== 压力测试配置 ===\n")
	fmt.Printf("目标地址: %s\n", config.BaseURL)
	fmt.Printf("测试场景: %s\n", config.Scenario)
	fmt.Printf("测试时长: %d 秒\n", *duration)
	fmt.Printf("并发数: %d\n", config.Concurrency)
	fmt.Printf("梯度压测: %v\n", config.Gradual)
	fmt.Printf("==================\n\n")

	// 健康检查
	if !healthCheck(config.BaseURL) {
		fmt.Println("❌ 后端服务未响应，退出测试")
		return
	}

	// 预加载可用商品ID
	fmt.Println("⏳ 预加载可用商品ID...")
	globalListingIDs = loadAvailableListings(config.BaseURL)
	if globalListingIDs == nil || len(globalListingIDs.ids) == 0 {
		fmt.Println("⚠️  无法加载商品ID，将使用随机ID（可能导致404）")
	} else {
		fmt.Printf("✅ 成功加载 %d 个可用商品ID\n\n", len(globalListingIDs.ids))
	}

	// 根据场景初始化认证
	var authPool *AuthPool
	var adminToken *AdminToken

	if config.Scenario == "realistic" || config.Scenario == "listing_only" {
		fmt.Printf("⏳ 预热：生成 %d 个测试用户 token...\n", config.WarmupUsers)
		authPool = initAuthPool(config.BaseURL, config.WarmupUsers)
		if authPool == nil || len(authPool.tokens) == 0 {
			fmt.Println("⚠️  无法生成用户token，将使用匿名访问")
		} else {
			fmt.Printf("✅ 成功生成 %d 个用户 token\n\n", len(authPool.tokens))
		}
	}

	if config.Scenario == "admin" {
		fmt.Println("⏳ 获取管理员 token...")
		adminToken = initAdminToken(config.BaseURL)
		if adminToken == nil || adminToken.token == "" {
			fmt.Println("❌ 无法获取管理员token，退出测试")
			return
		}
		fmt.Println("✅ 成功获取管理员 token\n")
	}

	// 执行压测
	var result *TestResult
	if config.Gradual {
		result = runGradualTest(config, authPool, adminToken)
	} else {
		result = runTest(config, authPool, adminToken)
	}

	printResult(result, *duration)
}

// ============================================
// 健康检查和认证初始化
// ============================================

func healthCheck(baseURL string) bool {
	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Get(baseURL + "/health")
	if err != nil {
		return false
	}
	defer resp.Body.Close()
	return resp.StatusCode == 200
}

func initAuthPool(baseURL string, userCount int) *AuthPool {
	pool := &AuthPool{tokens: make([]string, 0, userCount)}
	client := &http.Client{Timeout: 10 * time.Second}

	successCount := 0
	for i := 1; i <= userCount; i++ {
		phone := fmt.Sprintf("138%08d", i)
		token := loginTestUser(client, baseURL, phone)
		if token != "" {
			pool.tokens = append(pool.tokens, token)
			successCount++
		}

		// 每10个打印一次进度
		if i%10 == 0 || i == userCount {
			fmt.Printf("\r   进度: %d/%d (%d 成功)", i, userCount, successCount)
		}
	}
	fmt.Println()

	return pool
}

func loginTestUser(client *http.Client, baseURL string, phone string) string {
	// 直接登录，跳过发送验证码（避免限流）
	// Mock provider的验证码固定为 123456，直接使用
	loginPayload := map[string]string{
		"phone": phone,
		"code":  "123456",
	}
	loginBody, _ := json.Marshal(loginPayload)

	resp, err := client.Post(baseURL+"/api/auth/sms/login", "application/json", bytes.NewBuffer(loginBody))
	if err != nil {
		return ""
	}
	defer resp.Body.Close()

	// 如果验证码无效，发送一次验证码后重试
	if resp.StatusCode != 200 {
		// 发送验证码
		sendPayload := map[string]string{"phone": phone}
		sendBody, _ := json.Marshal(sendPayload)
		sendResp, err := client.Post(baseURL+"/api/auth/sms/send", "application/json", bytes.NewBuffer(sendBody))
		if err != nil {
			return ""
		}
		io.Copy(io.Discard, sendResp.Body)
		sendResp.Body.Close()

		// 等待验证码写入Redis
		time.Sleep(200 * time.Millisecond)

		// 重试登录
		resp2, err := client.Post(baseURL+"/api/auth/sms/login", "application/json", bytes.NewBuffer(loginBody))
		if err != nil {
			return ""
		}
		defer resp2.Body.Close()

		if resp2.StatusCode != 200 {
			return ""
		}

		var result struct {
			Code string `json:"code"`
			Data struct {
				AccessToken string `json:"access_token"`
			} `json:"data"`
		}

		if err := json.NewDecoder(resp2.Body).Decode(&result); err != nil {
			return ""
		}

		if result.Code == "ok" {
			return result.Data.AccessToken
		}
		return ""
	}

	var result struct {
		Code string `json:"code"` // 修复：API返回字符串"ok"
		Data struct {
			AccessToken string `json:"access_token"`
		} `json:"data"`
	}

	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return ""
	}

	if result.Code == "ok" {
		return result.Data.AccessToken
	}

	return ""
}

func initAdminToken(baseURL string) *AdminToken {
	client := &http.Client{Timeout: 10 * time.Second}

	// 获取验证码（为了获取captcha_id）
	resp, err := client.Get(baseURL + "/api/admin/auth/captcha")
	if err != nil {
		fmt.Printf("   错误: %v\n", err)
		return nil
	}
	defer resp.Body.Close()

	var captchaResp struct {
		Data struct {
			CaptchaID string `json:"captcha_id"`
		} `json:"data"`
	}

	if err := json.NewDecoder(resp.Body).Decode(&captchaResp); err != nil {
		return nil
	}

	adminUsername := os.Getenv("LOAD_STRESS_ADMIN_USERNAME")
	adminPassword := os.Getenv("LOAD_STRESS_ADMIN_PASSWORD")
	if adminUsername == "" || adminPassword == "" {
		fmt.Println("   跳过后台登录：请设置 LOAD_STRESS_ADMIN_USERNAME 和 LOAD_STRESS_ADMIN_PASSWORD")
		return nil
	}

	// 登录后台账号
	loginPayload := map[string]string{
		"username":     adminUsername,
		"password":     adminPassword,
		"captcha_id":   captchaResp.Data.CaptchaID,
		"captcha_code": "1234",
	}
	loginBody, _ := json.Marshal(loginPayload)

	resp, err = client.Post(baseURL+"/api/admin/auth/login", "application/json", bytes.NewBuffer(loginBody))
	if err != nil {
		fmt.Printf("   错误: %v\n", err)
		return nil
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		fmt.Printf("   登录失败: HTTP %d\n", resp.StatusCode)
		return nil
	}

	var loginResp struct {
		Code string `json:"code"`
		Data struct {
			AccessToken string `json:"access_token"`
			ExpiresIn   int    `json:"expires_in"`
		} `json:"data"`
	}

	if err := json.NewDecoder(resp.Body).Decode(&loginResp); err != nil {
		return nil
	}

	if loginResp.Code != "ok" {
		fmt.Printf("   登录失败: code=%s\n", loginResp.Code)
		return nil
	}

	return &AdminToken{
		token:     loginResp.Data.AccessToken,
		expiresAt: time.Now().Add(time.Duration(loginResp.Data.ExpiresIn) * time.Second),
	}
}

func (p *AuthPool) GetRandomToken() string {
	if p == nil || len(p.tokens) == 0 {
		return ""
	}
	p.mu.RLock()
	defer p.mu.RUnlock()
	return p.tokens[rand.Intn(len(p.tokens))]
}

func (a *AdminToken) Get() string {
	if a == nil {
		return ""
	}
	a.mu.RLock()
	defer a.mu.RUnlock()
	return a.token
}

func (p *ListingIDPool) GetRandomID() int {
	if p == nil || len(p.ids) == 0 {
		// 降级：返回随机ID
		return rand.Intn(5000) + 1
	}
	p.mu.RLock()
	defer p.mu.RUnlock()
	return p.ids[rand.Intn(len(p.ids))]
}

func loadAvailableListings(baseURL string) *ListingIDPool {
	client := &http.Client{Timeout: 10 * time.Second}
	pool := &ListingIDPool{ids: make([]int, 0, 1000)}

	// 获取前1000个可用商品ID
	for page := 1; page <= 10; page++ {
		url := fmt.Sprintf("%s/api/listings?page=%d&page_size=100", baseURL, page)
		resp, err := client.Get(url)
		if err != nil {
			break
		}

		var result struct {
			Code string `json:"code"` // 修复：API返回字符串"ok"而不是数字0
			Data struct {
				Items []struct {
					ID int `json:"id"`
				} `json:"items"`
			} `json:"data"`
		}

		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			resp.Body.Close()
			break
		}
		resp.Body.Close()

		if result.Code != "ok" || len(result.Data.Items) == 0 {
			break
		}

		for _, item := range result.Data.Items {
			pool.ids = append(pool.ids, item.ID)
		}

		// 如果不满100个，说明已经到最后一页
		if len(result.Data.Items) < 100 {
			break
		}
	}

	return pool
}

// ============================================
// 测试执行
// ============================================

func runTest(config TestConfig, authPool *AuthPool, adminToken *AdminToken) *TestResult {
	result := &TestResult{
		Errors:    make(map[string]int64),
		Latencies: make([]int64, 0, 100000),
	}

	var wg sync.WaitGroup
	stopChan := make(chan struct{})

	fmt.Printf("🚀 开始压测 (%d 并发, %v)...\n\n", config.Concurrency, config.Duration)

	// 启动统计goroutine
	statsTicker := time.NewTicker(5 * time.Second)
	go func() {
		for {
			select {
			case <-statsTicker.C:
				printProgress(result)
			case <-stopChan:
				statsTicker.Stop()
				return
			}
		}
	}()

	// 启动并发workers
	for i := 0; i < config.Concurrency; i++ {
		wg.Add(1)
		go func(workerID int) {
			defer wg.Done()
			worker(workerID, config, result, authPool, adminToken, stopChan)
		}(i)
	}

	// 等待测试时长
	time.Sleep(config.Duration)
	close(stopChan)

	wg.Wait()

	return result
}

func runGradualTest(config TestConfig, authPool *AuthPool, adminToken *AdminToken) *TestResult {
	profiles := []struct {
		Duration    time.Duration
		Concurrency int
	}{
		{30 * time.Second, 10},                     // 预热
		{60 * time.Second, config.Concurrency / 4}, // 25%负载
		{60 * time.Second, config.Concurrency / 2}, // 50%负载
		{60 * time.Second, config.Concurrency},     // 100%负载
		{30 * time.Second, config.Concurrency * 2}, // 峰值负载
	}

	result := &TestResult{
		Errors:    make(map[string]int64),
		Latencies: make([]int64, 0, 200000),
	}

	for i, profile := range profiles {
		fmt.Printf("📊 阶段 %d/%d: %d 并发, 持续 %v\n", i+1, len(profiles), profile.Concurrency, profile.Duration)

		phaseConfig := config
		phaseConfig.Duration = profile.Duration
		phaseConfig.Concurrency = profile.Concurrency

		phaseResult := runTest(phaseConfig, authPool, adminToken)

		// 合并结果
		result.mu.Lock()
		result.TotalRequests += phaseResult.TotalRequests
		result.SuccessRequests += phaseResult.SuccessRequests
		result.FailedRequests += phaseResult.FailedRequests
		result.Latencies = append(result.Latencies, phaseResult.Latencies...)
		for k, v := range phaseResult.Errors {
			result.Errors[k] += v
		}
		result.mu.Unlock()

		if i < len(profiles)-1 {
			fmt.Println("⏸  冷却 10 秒...")
			time.Sleep(10 * time.Second)
		}
	}

	return result
}

func worker(id int, config TestConfig, result *TestResult, authPool *AuthPool, adminToken *AdminToken, stopChan chan struct{}) {
	client := &http.Client{
		Timeout: 10 * time.Second,
	}

	for {
		select {
		case <-stopChan:
			return
		default:
			executeScenario(client, config, result, authPool, adminToken)
		}
	}
}

func executeScenario(client *http.Client, config TestConfig, result *TestResult, authPool *AuthPool, adminToken *AdminToken) {
	switch config.Scenario {
	case "realistic":
		executeRealisticScenario(client, config.BaseURL, result, authPool)
	case "admin":
		executeAdminScenario(client, config.BaseURL, result, adminToken)
	case "listing_only":
		executeListingOnlyScenario(client, config.BaseURL, result, authPool)
	default:
		testHealthCheck(client, config.BaseURL, result)
	}
}

// ============================================
// 业务场景实现
// ============================================

func executeRealisticScenario(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	r := rand.Intn(1000)
	switch {
	case r < 350: // 35% 查询商品列表
		testListListings(client, baseURL, result)
	case r < 600: // 25% 查询商品详情
		testGetListingDetail(client, baseURL, result)
	case r < 750: // 15% 查询我的订单
		testListMyOrders(client, baseURL, result, authPool)
	case r < 850: // 10% 查询钱包余额
		testWalletBalance(client, baseURL, result, authPool)
	case r < 920: // 7% 聊天列表
		testChatList(client, baseURL, result, authPool)
	case r < 970: // 5% 查询订单详情
		testOrderDetail(client, baseURL, result, authPool)
	case r < 990: // 2% 创建订单（需要认证）
		testCreateOrder(client, baseURL, result, authPool)
	default: // 1% 支付订单（需要认证）
		testPayOrder(client, baseURL, result, authPool)
	}
}

func executeAdminScenario(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	r := rand.Intn(100)
	switch {
	case r < 25: // 25% 用户管理列表
		testAdminUsers(client, baseURL, result, adminToken)
	case r < 45: // 20% 订单管理列表
		testAdminOrders(client, baseURL, result, adminToken)
	case r < 60: // 15% 商品审核列表
		testAdminListings(client, baseURL, result, adminToken)
	case r < 75: // 15% 钱包流水
		testAdminWalletLedger(client, baseURL, result, adminToken)
	case r < 85: // 10% 申诉管理
		testAdminDisputes(client, baseURL, result, adminToken)
	case r < 95: // 10% 审计日志
		testAdminAuditLogs(client, baseURL, result, adminToken)
	default: // 5% 仪表盘
		testAdminDashboard(client, baseURL, result, adminToken)
	}
}

func executeListingOnlyScenario(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	r := rand.Intn(100)
	if r < 70 {
		testListListings(client, baseURL, result)
	} else {
		testGetListingDetail(client, baseURL, result)
	}
}

// ============================================
// 具体测试函数
// ============================================

func testHealthCheck(client *http.Client, baseURL string, result *TestResult) {
	makeRequest(client, "GET", baseURL+"/health", "", nil, result, "health_check")
}

func testListListings(client *http.Client, baseURL string, result *TestResult) {
	page := rand.Intn(10) + 1
	pageSize := []int{10, 20, 50}[rand.Intn(3)]
	url := fmt.Sprintf("%s/api/listings?page=%d&page_size=%d", baseURL, page, pageSize)
	makeRequest(client, "GET", url, "", nil, result, "list_listings")
}

func testGetListingDetail(client *http.Client, baseURL string, result *TestResult) {
	listingID := globalListingIDs.GetRandomID()
	url := fmt.Sprintf("%s/api/listings/%d", baseURL, listingID)
	makeRequest(client, "GET", url, "", nil, result, "get_listing_detail")
}

func testListMyOrders(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	page := rand.Intn(5) + 1
	url := fmt.Sprintf("%s/api/orders?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, token, nil, result, "list_my_orders")
}

func testWalletBalance(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	makeAuthRequest(client, "GET", baseURL+"/api/wallet/balance", token, nil, result, "wallet_balance")
}

func testChatList(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	makeAuthRequest(client, "GET", baseURL+"/api/chats?page=1&page_size=20", token, nil, result, "chat_list")
}

func testOrderDetail(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	orderID := rand.Intn(3000) + 1
	url := fmt.Sprintf("%s/api/orders/%d", baseURL, orderID)
	makeAuthRequest(client, "GET", url, token, nil, result, "order_detail")
}

func testCreateOrder(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	listingID := globalListingIDs.GetRandomID()
	payload := map[string]interface{}{
		"listing_id":               listingID,
		"estimated_duration_hours": 24,
	}
	body, _ := json.Marshal(payload)
	makeAuthRequest(client, "POST", baseURL+"/api/orders", token, body, result, "create_order")
}

func testPayOrder(client *http.Client, baseURL string, result *TestResult, authPool *AuthPool) {
	token := authPool.GetRandomToken()
	if token == "" {
		return
	}
	orderID := rand.Intn(3000) + 1
	url := fmt.Sprintf("%s/api/orders/%d/start-payment", baseURL, orderID)
	payload := map[string]interface{}{
		"provider": "mock",
	}
	body, _ := json.Marshal(payload)
	makeAuthRequest(client, "POST", url, token, body, result, "pay_order")
}

// 管理后台测试函数
func testAdminUsers(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(10) + 1
	url := fmt.Sprintf("%s/api/admin/users?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_users")
}

func testAdminOrders(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(10) + 1
	url := fmt.Sprintf("%s/api/admin/orders?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_orders")
}

func testAdminListings(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(10) + 1
	url := fmt.Sprintf("%s/api/admin/listings?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_listings")
}

func testAdminWalletLedger(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(20) + 1
	url := fmt.Sprintf("%s/api/admin/wallet/ledger?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_wallet_ledger")
}

func testAdminDisputes(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(5) + 1
	url := fmt.Sprintf("%s/api/admin/disputes?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_disputes")
}

func testAdminAuditLogs(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	page := rand.Intn(20) + 1
	url := fmt.Sprintf("%s/api/admin/audit-logs?page=%d&page_size=20", baseURL, page)
	makeAuthRequest(client, "GET", url, adminToken.Get(), nil, result, "admin_audit_logs")
}

func testAdminDashboard(client *http.Client, baseURL string, result *TestResult, adminToken *AdminToken) {
	makeAuthRequest(client, "GET", baseURL+"/api/admin/dashboard", adminToken.Get(), nil, result, "admin_dashboard")
}

// ============================================
// HTTP 请求辅助函数
// ============================================

func makeRequest(client *http.Client, method, url, token string, body []byte, result *TestResult, apiName string) {
	var req *http.Request
	var err error

	if body != nil {
		req, err = http.NewRequest(method, url, bytes.NewBuffer(body))
	} else {
		req, err = http.NewRequest(method, url, nil)
	}

	if err != nil {
		recordError(result, apiName+"_req_error")
		atomic.AddInt64(&result.TotalRequests, 1)
		atomic.AddInt64(&result.FailedRequests, 1)
		return
	}

	if token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}
	if body != nil {
		req.Header.Set("Content-Type", "application/json")
	}

	start := time.Now()
	resp, err := client.Do(req)
	latency := time.Since(start).Milliseconds()

	atomic.AddInt64(&result.TotalRequests, 1)
	recordLatency(result, latency)

	if err != nil {
		atomic.AddInt64(&result.FailedRequests, 1)
		recordError(result, apiName+"_error: "+err.Error())
		return
	}
	defer resp.Body.Close()
	io.Copy(io.Discard, resp.Body)

	if resp.StatusCode >= 200 && resp.StatusCode < 300 {
		atomic.AddInt64(&result.SuccessRequests, 1)
	} else {
		atomic.AddInt64(&result.FailedRequests, 1)
		recordError(result, fmt.Sprintf("%s_status_%d", apiName, resp.StatusCode))
	}
}

func makeAuthRequest(client *http.Client, method, url, token string, body []byte, result *TestResult, apiName string) {
	makeRequest(client, method, url, token, body, result, apiName)
}

func recordLatency(result *TestResult, latency int64) {
	result.mu.Lock()
	defer result.mu.Unlock()
	result.Latencies = append(result.Latencies, latency)
}

func recordError(result *TestResult, errMsg string) {
	result.mu.Lock()
	defer result.mu.Unlock()
	result.Errors[errMsg]++
}

// ============================================
// 结果统计和输出
// ============================================

func printProgress(result *TestResult) {
	total := atomic.LoadInt64(&result.TotalRequests)
	success := atomic.LoadInt64(&result.SuccessRequests)
	failed := atomic.LoadInt64(&result.FailedRequests)

	if total > 0 {
		successRate := float64(success) / float64(total) * 100
		fmt.Printf("   进行中: %d 请求 | 成功率: %.2f%% | 失败: %d\n", total, successRate, failed)
	}
}

func printResult(result *TestResult, durationSec int) {
	fmt.Printf("\n\n=== 压力测试结果 ===\n")
	fmt.Printf("总请求数: %d\n", result.TotalRequests)
	fmt.Printf("成功请求: %d (%.2f%%)\n",
		result.SuccessRequests,
		float64(result.SuccessRequests)/float64(result.TotalRequests)*100)
	fmt.Printf("失败请求: %d (%.2f%%)\n",
		result.FailedRequests,
		float64(result.FailedRequests)/float64(result.TotalRequests)*100)

	qps := float64(result.TotalRequests) / float64(durationSec)
	fmt.Printf("\nQPS: %.2f\n", qps)

	if len(result.Latencies) > 0 {
		result.mu.Lock()
		latencies := make([]int64, len(result.Latencies))
		copy(latencies, result.Latencies)
		result.mu.Unlock()

		sort.Slice(latencies, func(i, j int) bool { return latencies[i] < latencies[j] })

		p50 := latencies[len(latencies)*50/100]
		p95 := latencies[len(latencies)*95/100]
		p99 := latencies[len(latencies)*99/100]
		min := latencies[0]
		max := latencies[len(latencies)-1]

		var sum int64
		for _, l := range latencies {
			sum += l
		}
		avg := sum / int64(len(latencies))

		fmt.Printf("\n延迟统计:\n")
		fmt.Printf("  最小: %d ms\n", min)
		fmt.Printf("  P50:  %d ms\n", p50)
		fmt.Printf("  平均: %d ms\n", avg)
		fmt.Printf("  P95:  %d ms\n", p95)
		fmt.Printf("  P99:  %d ms\n", p99)
		fmt.Printf("  最大: %d ms\n", max)
	}

	if len(result.Errors) > 0 {
		fmt.Printf("\n错误统计 (Top 10):\n")
		type errorPair struct {
			msg   string
			count int64
		}
		var errors []errorPair
		for msg, count := range result.Errors {
			errors = append(errors, errorPair{msg, count})
		}
		sort.Slice(errors, func(i, j int) bool { return errors[i].count > errors[j].count })

		for i, e := range errors {
			if i >= 10 {
				break
			}
			fmt.Printf("  %s: %d 次\n", e.msg, e.count)
		}
	}

	fmt.Printf("==================\n")
}