package service

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"
	"sync"
	"time"

	"github.com/gorilla/websocket"

	"market-data-service/api"
)

// TestService 测试服务接口
type TestService interface {
	// GetAPITestList 获取API测试列表
	GetAPITestList(ctx context.Context) (*api.APITestListData, error)
	
	// RunAPITest 执行API测试
	RunAPITest(ctx context.Context, baseURL string, req *api.APITestRequest) (*api.APITestResult, error)
	
	// GetWSTestList 获取WebSocket测试列表
	GetWSTestList(ctx context.Context) (*api.WSTestListData, error)
	
	// RunWSTest 执行WebSocket测试
	RunWSTest(ctx context.Context, wsURL string, req *api.WSTestRequest) (*api.WSTestResult, error)
	
	// GetTestHistory 获取测试历史
	GetTestHistory(ctx context.Context, req *api.TestHistoryRequest) (*api.TestHistoryData, error)
}

// TestServiceImpl 测试服务实现
type TestServiceImpl struct {
	mu          sync.RWMutex
	apiHistory  []api.APITestResult
	wsHistory   []api.WSTestResult
	historySize int
}

// NewTestService 创建测试服务
func NewTestService() TestService {
	return &TestServiceImpl{
		apiHistory:  make([]api.APITestResult, 0),
		wsHistory:   make([]api.WSTestResult, 0),
		historySize: 100, // 保留最近100条记录
	}
}

// GetAPITestList 获取API测试列表
func (s *TestServiceImpl) GetAPITestList(ctx context.Context) (*api.APITestListData, error) {
	categories := []api.APITestCategory{
		{
			Name: "股票接口",
			Items: []api.APITestCase{
				{
					ID:          "stock_klines",
					Name:        "查询股票K线",
					Method:      "GET",
					Path:        "/v1/stock/klines/{symbol}",
					Description: "查询指定股票的K线数据",
					Params: map[string]string{
						"symbol": "000001.SZ",
						"start":  time.Now().AddDate(0, 0, -30).Format("20060102"),
						"end":    time.Now().Format("20060102"),
						"freq":   "1d",
						"adjust": "qfq",
					},
				},
				{
					ID:          "stock_symbols",
					Name:        "查询股票列表",
					Method:      "GET",
					Path:        "/v1/stock/symbols",
					Description: "获取所有可用股票标的",
					Params: map[string]string{
						"page": "1",
						"size": "20",
					},
				},
				{
					ID:          "stock_batch",
					Name:        "批量查询股票K线",
					Method:      "POST",
					Path:        "/v1/stock/klines/batch",
					Description: "批量查询多只股票K线",
					Body: map[string]interface{}{
						"symbols": []string{"000001.SZ", "000002.SZ"},
						"start":   time.Now().AddDate(0, 0, -7).Format("20060102"),
						"end":     time.Now().Format("20060102"),
						"freq":    "1d",
					},
				},
				{
					ID:          "stock_calendar",
					Name:        "查询交易日历",
					Method:      "GET",
					Path:        "/v1/stock/trading-dates",
					Description: "查询股票交易日历",
					Params: map[string]string{
						"start": time.Now().AddDate(0, 0, -30).Format("20060102"),
						"end":   time.Now().AddDate(0, 0, 30).Format("20060102"),
					},
				},
			},
		},
		{
			Name: "期货接口",
			Items: []api.APITestCase{
				{
					ID:          "futures_klines",
					Name:        "查询期货K线",
					Method:      "GET",
					Path:        "/v1/futures/klines/{symbol}",
					Description: "查询指定期货合约的K线数据",
					Params: map[string]string{
						"symbol": "CU2504.SHFE",
						"start":  time.Now().AddDate(0, 0, -30).Format("20060102"),
						"end":    time.Now().Format("20060102"),
						"freq":   "1d",
					},
				},
				{
					ID:          "futures_symbols",
					Name:        "查询期货列表",
					Method:      "GET",
					Path:        "/v1/futures/symbols",
					Description: "获取所有可用期货标的",
					Params: map[string]string{
						"page": "1",
						"size": "20",
					},
				},
				{
					ID:          "futures_batch",
					Name:        "批量查询期货K线",
					Method:      "POST",
					Path:        "/v1/futures/klines/batch",
					Description: "批量查询多个期货合约K线",
					Body: map[string]interface{}{
						"symbols": []string{"CU2504.SHFE", "RB2505.SHFE"},
						"start":   time.Now().AddDate(0, 0, -7).Format("20060102"),
						"end":     time.Now().Format("20060102"),
						"freq":    "1d",
					},
				},
				{
					ID:          "futures_contracts",
					Name:        "查询合约列表",
					Method:      "GET",
					Path:        "/v1/futures/contracts",
					Description: "根据品种查询可交易合约",
					Params: map[string]string{
						"underlying": "CU",
						"exchange":   "SHFE",
					},
				},
				{
					ID:          "futures_calendar",
					Name:        "查询期货交易日历",
					Method:      "GET",
					Path:        "/v1/futures/trading-dates",
					Description: "查询期货交易日历",
					Params: map[string]string{
						"start": time.Now().AddDate(0, 0, -30).Format("20060102"),
						"end":   time.Now().AddDate(0, 0, 30).Format("20060102"),
					},
				},
			},
		},
		{
			Name: "管理接口",
			Items: []api.APITestCase{
				{
					ID:          "admin_health",
					Name:        "健康检查",
					Method:      "GET",
					Path:        "/v1/admin/health",
					Description: "检查服务健康状态",
					Params:      map[string]string{},
				},
				{
					ID:          "admin_source_status",
					Name:        "数据源状态",
					Method:      "GET",
					Path:        "/v1/admin/source/status",
					Description: "获取当前数据源状态",
					Params:      map[string]string{},
				},
			},
		},
	}
	
	return &api.APITestListData{
		Categories: categories,
		BaseURL:    "",
	}, nil
}

// RunAPITest 执行API测试
func (s *TestServiceImpl) RunAPITest(ctx context.Context, baseURL string, req *api.APITestRequest) (*api.APITestResult, error) {
	// 获取测试用例
	testList, _ := s.GetAPITestList(ctx)
	
	var testCase *api.APITestCase
	for _, cat := range testList.Categories {
		for _, item := range cat.Items {
			if item.ID == req.ID {
				testCase = &item
				break
			}
		}
	}
	
	if testCase == nil {
		return nil, fmt.Errorf("test case not found: %s", req.ID)
	}
	
	// 合并参数
	params := make(map[string]string)
	for k, v := range testCase.Params {
		params[k] = v
	}
	for k, v := range req.Params {
		params[k] = v
	}
	
	// 构建URL
	url := baseURL + testCase.Path
	for k, v := range params {
		url = strings.Replace(url, "{"+k+"}", v, -1)
	}
	
	// 添加查询参数
	if testCase.Method == "GET" && len(params) > 0 {
		queryParts := []string{}
		for k, v := range params {
			if !strings.Contains(testCase.Path, "{"+k+"}") {
				queryParts = append(queryParts, fmt.Sprintf("%s=%s", k, v))
			}
		}
		if len(queryParts) > 0 {
			url += "?" + strings.Join(queryParts, "&")
		}
	}
	
	// 准备请求体
	var body interface{}
	if req.Body != nil {
		body = req.Body
	} else {
		body = testCase.Body
	}
	
	// 创建HTTP客户端
	client := &http.Client{
		Timeout: 30 * time.Second,
	}
	
	// 构建请求
	var httpReq *http.Request
	var err error
	
	if body != nil && testCase.Method != "GET" {
		jsonBody, _ := json.Marshal(body)
		httpReq, err = http.NewRequestWithContext(ctx, testCase.Method, url, bytes.NewBuffer(jsonBody))
		httpReq.Header.Set("Content-Type", "application/json")
	} else {
		httpReq, err = http.NewRequestWithContext(ctx, testCase.Method, url, nil)
	}
	
	if err != nil {
		return nil, err
	}
	
	httpReq.Header.Set("X-API-Key", "test-api-key")
	
	// 执行请求
	startTime := time.Now()
	resp, err := client.Do(httpReq)
	latency := time.Since(startTime).Milliseconds()
	
	result := &api.APITestResult{
		ID:        int(time.Now().Unix()),
		CaseID:    req.ID,
		Name:      testCase.Name,
		Latency:   latency,
		Timestamp: time.Now(),
		Request: map[string]interface{}{
			"method": testCase.Method,
			"url":    url,
			"body":   body,
		},
	}
	
	if err != nil {
		result.Success = false
		result.Error = err.Error()
		s.addAPIHistory(result)
		return result, nil
	}
	defer resp.Body.Close()
	
	result.StatusCode = resp.StatusCode
	result.Success = resp.StatusCode >= 200 && resp.StatusCode < 300
	
	// 解析响应
	var respBody interface{}
	if err := json.NewDecoder(resp.Body).Decode(&respBody); err == nil {
		result.Response = respBody
	} else {
		result.Response = map[string]string{"raw": "非JSON响应"}
	}
	
	s.addAPIHistory(result)
	return result, nil
}

// GetWSTestList 获取WebSocket测试列表
func (s *TestServiceImpl) GetWSTestList(ctx context.Context) (*api.WSTestListData, error) {
	cases := []api.WSTestCase{
		{
			ID:          "ws_subscribe_stock",
			Name:        "订阅股票行情",
			Description: "订阅单只股票实时行情",
			Action:      "subscribe",
			Symbols:     []string{"000001.SZ"},
		},
		{
			ID:          "ws_subscribe_futures",
			Name:        "订阅期货行情",
			Description: "订阅单个期货合约实时行情",
			Action:      "subscribe",
			Symbols:     []string{"CU2504.SHFE"},
		},
		{
			ID:          "ws_subscribe_multi",
			Name:        "批量订阅",
			Description: "同时订阅多个标的",
			Action:      "subscribe",
			Symbols:     []string{"000001.SZ", "000002.SZ", "CU2504.SHFE"},
		},
		{
			ID:          "ws_unsubscribe",
			Name:        "取消订阅",
			Description: "取消订阅标的",
			Action:      "unsubscribe",
			Symbols:     []string{"000001.SZ"},
		},
	}
	
	return &api.WSTestListData{
		Cases: cases,
		WSURL: "",
	}, nil
}

// RunWSTest 执行WebSocket测试
func (s *TestServiceImpl) RunWSTest(ctx context.Context, wsURL string, req *api.WSTestRequest) (*api.WSTestResult, error) {
	// 获取测试用例
	testList, _ := s.GetWSTestList(ctx)
	
	var testCase *api.WSTestCase
	for _, item := range testList.Cases {
		if item.ID == req.ID {
			testCase = &item
			break
		}
	}
	
	if testCase == nil {
		return nil, fmt.Errorf("test case not found: %s", req.ID)
	}
	
	// 使用自定义标的
	symbols := testCase.Symbols
	if len(req.Symbols) > 0 {
		symbols = req.Symbols
	}
	
	result := &api.WSTestResult{
		ID:        fmt.Sprintf("ws_%d", time.Now().Unix()),
		CaseID:    req.ID,
		Timestamp: time.Now(),
		Messages:  []api.WSMessage{},
	}
	
	// 连接WebSocket
	dialer := websocket.Dialer{
		HandshakeTimeout: 10 * time.Second,
	}
	
	// 将 http:// 或 https:// 替换为 ws:// 或 wss://
	if strings.HasPrefix(wsURL, "https://") {
		wsURL = strings.Replace(wsURL, "https://", "wss://", 1)
	} else if strings.HasPrefix(wsURL, "http://") {
		wsURL = strings.Replace(wsURL, "http://", "ws://", 1)
	}
	
	startTime := time.Now()
	conn, resp, err := dialer.Dial(wsURL, http.Header{
		"X-API-Key": []string{"test-api-key"},
	})
	result.Latency = time.Since(startTime).Milliseconds()
	
	if err != nil {
		result.Success = false
		if resp != nil {
			result.Error = fmt.Sprintf("连接失败，状态码: %d", resp.StatusCode)
		} else {
			result.Error = fmt.Sprintf("连接失败: %v", err)
		}
		s.addWSHistory(result)
		return result, nil
	}
	defer conn.Close()
	
	result.Success = true
	
	// 发送订阅消息
	msg := map[string]interface{}{
		"action":  testCase.Action,
		"symbols": symbols,
	}
	
	if err := conn.WriteJSON(msg); err != nil {
		result.Error = fmt.Sprintf("发送消息失败: %v", err)
		s.addWSHistory(result)
		return result, nil
	}
	
	// 等待响应
	conn.SetReadDeadline(time.Now().Add(5 * time.Second))
	
	for i := 0; i < 3; i++ { // 最多读取3条消息
		var msgData map[string]interface{}
		if err := conn.ReadJSON(&msgData); err != nil {
			break
		}
		
		result.Messages = append(result.Messages, api.WSMessage{
			Type:      "received",
			Data:      msgData,
			Timestamp: time.Now(),
		})
	}
	
	s.addWSHistory(result)
	return result, nil
}

// GetTestHistory 获取测试历史
func (s *TestServiceImpl) GetTestHistory(ctx context.Context, req *api.TestHistoryRequest) (*api.TestHistoryData, error) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	
	limit := req.Limit
	if limit <= 0 || limit > len(s.apiHistory) {
		limit = len(s.apiHistory)
	}
	
	// 获取最近的数据
	apiTests := make([]api.APITestResult, 0)
	wsTests := make([]api.WSTestResult, 0)
	
	if req.Type == "" || req.Type == "api" {
		start := len(s.apiHistory) - limit
		if start < 0 {
			start = 0
		}
		apiTests = append(apiTests, s.apiHistory[start:]...)
	}
	
	if req.Type == "" || req.Type == "ws" {
		wsLimit := req.Limit
		if wsLimit <= 0 || wsLimit > len(s.wsHistory) {
			wsLimit = len(s.wsHistory)
		}
		start := len(s.wsHistory) - wsLimit
		if start < 0 {
			start = 0
		}
		wsTests = append(wsTests, s.wsHistory[start:]...)
	}
	
	return &api.TestHistoryData{
		APITests: apiTests,
		WSTests:  wsTests,
	}, nil
}

// addAPIHistory 添加API测试历史
func (s *TestServiceImpl) addAPIHistory(result *api.APITestResult) {
	s.mu.Lock()
	defer s.mu.Unlock()
	
	s.apiHistory = append(s.apiHistory, *result)
	
	// 限制历史记录数量
	if len(s.apiHistory) > s.historySize {
		s.apiHistory = s.apiHistory[len(s.apiHistory)-s.historySize:]
	}
}

// addWSHistory 添加WebSocket测试历史
func (s *TestServiceImpl) addWSHistory(result *api.WSTestResult) {
	s.mu.Lock()
	defer s.mu.Unlock()
	
	s.wsHistory = append(s.wsHistory, *result)
	
	// 限制历史记录数量
	if len(s.wsHistory) > s.historySize {
		s.wsHistory = s.wsHistory[len(s.wsHistory)-s.historySize:]
	}
}