package handler

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
)

// 测试用的请求结构
type TestRegisterRequest struct {
	Username string `json:"username"`
	Email    string `json:"email"`
	Password string `json:"password"`
}

type TestLoginRequest struct {
	Username string `json:"username"`
	Password string `json:"password"`
}

func TestAuthHandler_Register(t *testing.T) {
	// 设置Gin为测试模式
	gin.SetMode(gin.TestMode)

	tests := []struct {
		name           string
		request        TestRegisterRequest
		expectedStatus int
	}{
		{
			name: "有效注册请求",
			request: TestRegisterRequest{
				Username: "testuser",
				Email:    "test@example.com",
				Password: "password123",
			},
			expectedStatus: http.StatusOK, // 注意：实际可能返回201或其他状态码
		},
		{
			name: "无效请求 - 缺少用户名",
			request: TestRegisterRequest{
				Username: "",
				Email:    "test@example.com",
				Password: "password123",
			},
			expectedStatus: http.StatusBadRequest,
		},
		{
			name: "无效请求 - 缺少邮箱",
			request: TestRegisterRequest{
				Username: "testuser",
				Email:    "",
				Password: "password123",
			},
			expectedStatus: http.StatusBadRequest,
		},
		{
			name: "无效请求 - 缺少密码",
			request: TestRegisterRequest{
				Username: "testuser",
				Email:    "test@example.com",
				Password: "",
			},
			expectedStatus: http.StatusBadRequest,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 创建请求体
			requestBody, err := json.Marshal(tt.request)
			if err != nil {
				t.Fatalf("Failed to marshal request: %v", err)
			}

			// 创建HTTP请求
			req, err := http.NewRequest("POST", "/api/auth/register", bytes.NewBuffer(requestBody))
			if err != nil {
				t.Fatalf("Failed to create request: %v", err)
			}
			req.Header.Set("Content-Type", "application/json")

			// 创建响应记录器
			w := httptest.NewRecorder()

			// 创建Gin上下文
			c, _ := gin.CreateTestContext(w)
			c.Request = req

			// 注意：这里需要实际的AuthHandler实例
			// 由于没有数据库连接，这个测试会失败
			// 这里只是展示测试结构
			
			// 验证请求格式（基本验证）
			if tt.request.Username == "" || tt.request.Email == "" || tt.request.Password == "" {
				if w.Code != tt.expectedStatus && tt.expectedStatus == http.StatusBadRequest {
					// 这是预期的错误情况
					t.Logf("Expected bad request for invalid input: %+v", tt.request)
				}
			} else {
				t.Logf("Valid request format: %+v", tt.request)
			}
		})
	}
}

func TestAuthHandler_Login(t *testing.T) {
	gin.SetMode(gin.TestMode)

	tests := []struct {
		name           string
		request        TestLoginRequest
		expectedStatus int
	}{
		{
			name: "有效登录请求",
			request: TestLoginRequest{
				Username: "testuser",
				Password: "password123",
			},
			expectedStatus: http.StatusOK,
		},
		{
			name: "无效请求 - 缺少用户名",
			request: TestLoginRequest{
				Username: "",
				Password: "password123",
			},
			expectedStatus: http.StatusBadRequest,
		},
		{
			name: "无效请求 - 缺少密码",
			request: TestLoginRequest{
				Username: "testuser",
				Password: "",
			},
			expectedStatus: http.StatusBadRequest,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 创建请求体
			requestBody, err := json.Marshal(tt.request)
			if err != nil {
				t.Fatalf("Failed to marshal request: %v", err)
			}

			// 创建HTTP请求
			req, err := http.NewRequest("POST", "/api/auth/login", bytes.NewBuffer(requestBody))
			if err != nil {
				t.Fatalf("Failed to create request: %v", err)
			}
			req.Header.Set("Content-Type", "application/json")

			// 创建响应记录器
			w := httptest.NewRecorder()

			// 创建Gin上下文
			c, _ := gin.CreateTestContext(w)
			c.Request = req

			// 验证请求格式（基本验证）
			if tt.request.Username == "" || tt.request.Password == "" {
				if tt.expectedStatus == http.StatusBadRequest {
					t.Logf("Expected bad request for invalid input: %+v", tt.request)
				}
			} else {
				t.Logf("Valid request format: %+v", tt.request)
			}
		})
	}
}

// 测试JSON解析
func TestJSONParsing(t *testing.T) {
	tests := []struct {
		name    string
		jsonStr string
		valid   bool
	}{
		{
			name:    "有效JSON",
			jsonStr: `{"username":"test","email":"test@example.com","password":"123456"}`,
			valid:   true,
		},
		{
			name:    "无效JSON",
			jsonStr: `{"username":"test","email":"test@example.com","password":}`,
			valid:   false,
		},
		{
			name:    "空JSON",
			jsonStr: `{}`,
			valid:   true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var req TestRegisterRequest
			err := json.Unmarshal([]byte(tt.jsonStr), &req)
			
			if tt.valid && err != nil {
				t.Errorf("Expected valid JSON, got error: %v", err)
			}
			
			if !tt.valid && err == nil {
				t.Errorf("Expected invalid JSON, but parsing succeeded")
			}
		})
	}
}

// 测试HTTP状态码常量
func TestHTTPStatusCodes(t *testing.T) {
	expectedCodes := map[string]int{
		"OK":                  http.StatusOK,
		"Created":             http.StatusCreated,
		"BadRequest":          http.StatusBadRequest,
		"Unauthorized":        http.StatusUnauthorized,
		"InternalServerError": http.StatusInternalServerError,
	}

	for name, expectedCode := range expectedCodes {
		t.Run(name, func(t *testing.T) {
			if expectedCode <= 0 {
				t.Errorf("Invalid status code for %s: %d", name, expectedCode)
			}
			t.Logf("%s status code: %d", name, expectedCode)
		})
	}
}