package integration

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"sync/atomic"
	"testing"

	_ "modernc.org/sqlite" // 纯 Go SQLite，注册 "sqlite" 驱动
	gormsqlite "gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"github.com/user-management-system/internal/domain"
	"github.com/user-management-system/internal/repository"
)

var integDBCounter int64

func setupTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	id := atomic.AddInt64(&integDBCounter, 1)
	dsn := fmt.Sprintf("file:integtestdb%d?mode=memory&cache=private", id)
	db, err := gorm.Open(gormsqlite.New(gormsqlite.Config{
		DriverName: "sqlite",
		DSN:        dsn,
	}), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		t.Fatalf("打开测试数据库失败: %v", err)
	}
	if err := db.AutoMigrate(&domain.User{}, &domain.Role{}, &domain.Permission{}, &domain.Device{}); err != nil {
		t.Fatalf("数据库迁移失败: %v", err)
	}
	return db
}

func cleanupTestDB(t *testing.T, db *gorm.DB) {
	t.Helper()
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

// setupTestServer 测试服务器
func setupTestServer(t *testing.T) *httptest.Server {
	t.Helper()
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/auth/register", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(`{"code":0,"message":"success","data":{"user_id":1}}`))
	})
	mux.HandleFunc("/api/v1/auth/login", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(`{"code":0,"message":"success","data":{"access_token":"test-token"}}`))
	})
	mux.HandleFunc("/api/v1/users/", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(`{"code":0,"message":"success","data":{"id":1,"username":"testuser"}}`))
	})
	return httptest.NewServer(mux)
}

// TestDatabaseIntegration 测试数据库集成
func TestDatabaseIntegration(t *testing.T) {
	db := setupTestDB(t)
	defer cleanupTestDB(t, db)
	repo := repository.NewUserRepository(db)
	ctx := context.Background()

	t.Run("CreateUser", func(t *testing.T) {
		user := &domain.User{
			Phone:    domain.StrPtr("13800138000"),
			Username: "integrationuser",
			Password: "hashedpassword",
			Status:   domain.UserStatusActive,
		}
		if err := repo.Create(ctx, user); err != nil {
			t.Fatalf("创建用户失败: %v", err)
		}
		if user.ID == 0 {
			t.Error("用户ID不应为0")
		}
	})

	t.Run("FindUser", func(t *testing.T) {
		user, err := repo.GetByUsername(ctx, "integrationuser")
		if err != nil {
			t.Fatalf("查询用户失败: %v", err)
		}
		if domain.DerefStr(user.Phone) != "13800138000" {
			t.Errorf("Phone = %v, want 13800138000", domain.DerefStr(user.Phone))
		}
	})

	t.Run("UpdateUser", func(t *testing.T) {
		user, _ := repo.GetByUsername(ctx, "integrationuser")
		user.Nickname = "已更新"
		if err := repo.Update(ctx, user); err != nil {
			t.Fatalf("更新用户失败: %v", err)
		}
		found, _ := repo.GetByID(ctx, user.ID)
		if found.Nickname != "已更新" {
			t.Errorf("Nickname = %v, want 已更新", found.Nickname)
		}
	})

	t.Run("DeleteUser", func(t *testing.T) {
		user, _ := repo.GetByUsername(ctx, "integrationuser")
		if err := repo.Delete(ctx, user.ID); err != nil {
			t.Fatalf("删除用户失败: %v", err)
		}
		_, err := repo.GetByUsername(ctx, "integrationuser")
		if err == nil {
			t.Error("删除后查询应返回错误")
		}
	})
}

// TestTransactionIntegration 测试事务集成
func TestTransactionIntegration(t *testing.T) {
	db := setupTestDB(t)
	defer cleanupTestDB(t, db)

	t.Run("TransactionRollback", func(t *testing.T) {
		err := db.Transaction(func(tx *gorm.DB) error {
		user := &domain.User{
			Phone:    domain.StrPtr("13811111111"),
			Username: "txrollbackuser",
			Password: "hashedpassword",
			Status:   domain.UserStatusActive,
		}
			if err := tx.Create(user).Error; err != nil {
				return err
			}
			return errors.New("模拟错误，触发回滚")
		})
		if err == nil {
			t.Error("事务应该失败")
		}

		var count int64
		db.Model(&domain.User{}).Where("username = ?", "txrollbackuser").Count(&count)
		if count > 0 {
			t.Error("事务回滚后用户不应存在")
		}
	})

	t.Run("TransactionCommit", func(t *testing.T) {
		err := db.Transaction(func(tx *gorm.DB) error {
		user := &domain.User{
			Phone:    domain.StrPtr("13822222222"),
			Username: "txcommituser",
			Password: "hashedpassword",
			Status:   domain.UserStatusActive,
		}
			return tx.Create(user).Error
		})
		if err != nil {
			t.Fatalf("事务失败: %v", err)
		}

		var count int64
		db.Model(&domain.User{}).Where("username = ?", "txcommituser").Count(&count)
		if count != 1 {
			t.Error("事务提交后用户应存在")
		}
	})
}

// TestAPIIntegration 测试HTTP API集成
func TestAPIIntegration(t *testing.T) {
	server := setupTestServer(t)
	defer server.Close()

	t.Run("RegisterEndpoint", func(t *testing.T) {
		resp, err := http.Post(server.URL+"/api/v1/auth/register", "application/json", nil)
		if err != nil {
			t.Fatalf("请求失败: %v", err)
		}
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			t.Errorf("StatusCode = %d, want 200", resp.StatusCode)
		}
	})

	t.Run("LoginEndpoint", func(t *testing.T) {
		resp, err := http.Post(server.URL+"/api/v1/auth/login", "application/json", nil)
		if err != nil {
			t.Fatalf("请求失败: %v", err)
		}
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			t.Errorf("StatusCode = %d, want 200", resp.StatusCode)
		}
	})

	t.Run("GetUserEndpoint", func(t *testing.T) {
		resp, err := http.Get(server.URL + "/api/v1/users/1")
		if err != nil {
			t.Fatalf("请求失败: %v", err)
		}
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			t.Errorf("StatusCode = %d, want 200", resp.StatusCode)
		}
	})
}