package service_test

import (
	"context"
	"testing"
	"time"

	"github.com/user-management-system/internal/domain"
	"github.com/user-management-system/internal/repository"
	"github.com/user-management-system/internal/service"
	gormsqlite "gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

// =============================================================================
// Device Service Tests
// =============================================================================

func setupDeviceTestEnv(t *testing.T) (*service.DeviceService, *gorm.DB) {
	t.Helper()

	db, err := gorm.Open(gormsqlite.New(gormsqlite.Config{
		DriverName: "sqlite",
		DSN:        "file:device_test?mode=memory&cache=shared",
	}), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		t.Fatalf("failed to connect database: %v", err)
	}

	if err := db.AutoMigrate(&domain.User{}, &domain.Device{}); err != nil {
		t.Fatalf("failed to migrate: %v", err)
	}

	// Create test user
	db.Create(&domain.User{Username: "deviceuser", Status: domain.UserStatusActive})

	deviceRepo := repository.NewDeviceRepository(db)
	userRepo := repository.NewUserRepository(db)
	deviceSvc := service.NewDeviceService(deviceRepo, userRepo)

	return deviceSvc, db
}

func TestDeviceService_CreateDevice(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	t.Run("Create device success", func(t *testing.T) {
		req := &service.CreateDeviceRequest{
			DeviceID:      "device001",
			DeviceName:    "Test Device",
			DeviceType:    int(domain.DeviceTypeDesktop),
			DeviceOS:      "Windows",
			DeviceBrowser: "Chrome",
			IP:            "192.168.1.1",
			Location:      "Beijing",
		}
		device, err := svc.CreateDevice(ctx, 1, req)
		if err != nil {
			t.Fatalf("CreateDevice failed: %v", err)
		}
		if device.DeviceID != "device001" {
			t.Errorf("Expected device ID 'device001', got %s", device.DeviceID)
		}
	})

	t.Run("Create device for non-existent user", func(t *testing.T) {
		req := &service.CreateDeviceRequest{
			DeviceID: "device002",
		}
		_, err := svc.CreateDevice(ctx, 9999, req)
		if err == nil {
			t.Error("Expected error for non-existent user")
		}
	})

	t.Run("Create duplicate device updates last active time", func(t *testing.T) {
		req := &service.CreateDeviceRequest{
			DeviceID:   "device003",
			DeviceName: "First",
		}
		svc.CreateDevice(ctx, 1, req)

		// Create again with same device ID
		req2 := &service.CreateDeviceRequest{
			DeviceID:   "device003",
			DeviceName: "Second",
		}
		device, err := svc.CreateDevice(ctx, 1, req2)
		if err != nil {
			t.Fatalf("CreateDevice failed: %v", err)
		}
		// Should return existing device with first name (not updated)
		if device.DeviceName != "First" {
			t.Logf("Device name: %s", device.DeviceName)
		}
	})
}

func TestDeviceService_UpdateDevice(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	// Create device first
	req := &service.CreateDeviceRequest{
		DeviceID:   "update_device",
		DeviceName: "Original",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Update device success", func(t *testing.T) {
		updateReq := &service.UpdateDeviceRequest{
			DeviceName: "Updated",
			DeviceOS:   "macOS",
		}
		updated, err := svc.UpdateDevice(ctx, device.ID, updateReq)
		if err != nil {
			t.Fatalf("UpdateDevice failed: %v", err)
		}
		if updated.DeviceName != "Updated" {
			t.Errorf("Expected name 'Updated', got %s", updated.DeviceName)
		}
	})

	t.Run("Update non-existent device", func(t *testing.T) {
		updateReq := &service.UpdateDeviceRequest{
			DeviceName: "NotExist",
		}
		_, err := svc.UpdateDevice(ctx, 9999, updateReq)
		if err == nil {
			t.Error("Expected error for non-existent device")
		}
	})
}

func TestDeviceService_GetDevice(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "get_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Get device success", func(t *testing.T) {
		got, err := svc.GetDevice(ctx, device.ID)
		if err != nil {
			t.Fatalf("GetDevice failed: %v", err)
		}
		if got.DeviceID != "get_device" {
			t.Errorf("Expected device ID 'get_device', got %s", got.DeviceID)
		}
	})
}

func TestDeviceService_GetUserDevices(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	// Create multiple devices
	for i := 0; i < 3; i++ {
		req := &service.CreateDeviceRequest{
			DeviceID: string(rune('a' + i)),
		}
		svc.CreateDevice(ctx, 1, req)
	}

	t.Run("Get user devices", func(t *testing.T) {
		devices, total, err := svc.GetUserDevices(ctx, 1, 1, 10)
		if err != nil {
			t.Fatalf("GetUserDevices failed: %v", err)
		}
		if total < 3 {
			t.Errorf("Expected total >= 3, got %d", total)
		}
		if len(devices) < 3 {
			t.Logf("Got %d devices", len(devices))
		}
	})

	t.Run("Get user devices with default pagination", func(t *testing.T) {
		_, _, err := svc.GetUserDevices(ctx, 1, 0, 0)
		if err != nil {
			t.Fatalf("GetUserDevices failed: %v", err)
		}
	})
}

func TestDeviceService_TrustDevice(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "trust_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Trust device success", func(t *testing.T) {
		err := svc.TrustDevice(ctx, device.ID, 24*time.Hour)
		if err != nil {
			t.Fatalf("TrustDevice failed: %v", err)
		}
	})

	t.Run("Trust non-existent device", func(t *testing.T) {
		err := svc.TrustDevice(ctx, 9999, time.Hour)
		if err == nil {
			t.Error("Expected error for non-existent device")
		}
	})

	t.Run("Untrust device", func(t *testing.T) {
		err := svc.UntrustDevice(ctx, device.ID)
		if err != nil {
			t.Fatalf("UntrustDevice failed: %v", err)
		}
	})
}

func TestDeviceService_TrustDeviceByDeviceID(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "trust_by_id",
	}
	svc.CreateDevice(ctx, 1, req)

	t.Run("Trust device by device ID", func(t *testing.T) {
		err := svc.TrustDeviceByDeviceID(ctx, 1, "trust_by_id", time.Hour)
		if err != nil {
			t.Fatalf("TrustDeviceByDeviceID failed: %v", err)
		}
	})

	t.Run("Trust non-existent device by device ID", func(t *testing.T) {
		err := svc.TrustDeviceByDeviceID(ctx, 1, "not_exist", time.Hour)
		if err == nil {
			t.Error("Expected error for non-existent device")
		}
	})
}

func TestDeviceService_GetActiveDevices(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "active_device",
	}
	svc.CreateDevice(ctx, 1, req)

	t.Run("Get active devices", func(t *testing.T) {
		devices, _, err := svc.GetActiveDevices(ctx, 1, 10)
		if err != nil {
			t.Fatalf("GetActiveDevices failed: %v", err)
		}
		if len(devices) == 0 {
			t.Log("No active devices")
		}
	})
}

func TestDeviceService_GetAllDevices(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "all_device",
	}
	svc.CreateDevice(ctx, 1, req)

	t.Run("Get all devices", func(t *testing.T) {
		req := &service.GetAllDevicesRequest{
			Page:     1,
			PageSize: 10,
		}
		devices, total, err := svc.GetAllDevices(ctx, req)
		if err != nil {
			t.Fatalf("GetAllDevices failed: %v", err)
		}
		if total < 1 {
			t.Error("Expected at least 1 device")
		}
		_ = devices
	})

	t.Run("Get all devices with status filter", func(t *testing.T) {
		status := int(domain.DeviceStatusActive)
		req := &service.GetAllDevicesRequest{
			Page:     1,
			PageSize: 10,
			Status:   &status,
		}
		_, _, err := svc.GetAllDevices(ctx, req)
		if err != nil {
			t.Fatalf("GetAllDevices failed: %v", err)
		}
	})

	t.Run("Get all devices with trusted filter", func(t *testing.T) {
		isTrusted := true
		req := &service.GetAllDevicesRequest{
			Page:      1,
			PageSize:  10,
			IsTrusted: &isTrusted,
		}
		_, _, err := svc.GetAllDevices(ctx, req)
		if err != nil {
			t.Fatalf("GetAllDevices failed: %v", err)
		}
	})
}

func TestDeviceService_DeleteDevice(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "delete_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Delete device", func(t *testing.T) {
		err := svc.DeleteDevice(ctx, device.ID)
		if err != nil {
			t.Fatalf("DeleteDevice failed: %v", err)
		}
	})
}

func TestDeviceService_UpdateDeviceStatus(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "status_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Update device status", func(t *testing.T) {
		err := svc.UpdateDeviceStatus(ctx, device.ID, domain.DeviceStatusInactive)
		if err != nil {
			t.Fatalf("UpdateDeviceStatus failed: %v", err)
		}
	})
}

func TestDeviceService_GetTrustedDevices(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "trusted_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)
	svc.TrustDevice(ctx, device.ID, time.Hour)

	t.Run("Get trusted devices", func(t *testing.T) {
		devices, err := svc.GetTrustedDevices(ctx, 1)
		if err != nil {
			t.Fatalf("GetTrustedDevices failed: %v", err)
		}
		if len(devices) == 0 {
			t.Log("No trusted devices")
		}
	})
}

func TestDeviceService_UpdateLastActiveTime(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "last_active_device",
	}
	device, _ := svc.CreateDevice(ctx, 1, req)

	t.Run("Update last active time", func(t *testing.T) {
		err := svc.UpdateLastActiveTime(ctx, device.ID)
		if err != nil {
			t.Fatalf("UpdateLastActiveTime failed: %v", err)
		}
	})

	t.Run("Update last active time for non-existent device", func(t *testing.T) {
		err := svc.UpdateLastActiveTime(ctx, 9999)
		// May not return error depending on implementation
		_ = err
	})
}

func TestDeviceService_LogoutAllOtherDevices(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	// Create multiple devices
	var firstDeviceID int64
	for i := 0; i < 3; i++ {
		req := &service.CreateDeviceRequest{
			DeviceID: "logout_device_" + string(rune('a'+i)),
		}
		device, _ := svc.CreateDevice(ctx, 1, req)
		if i == 0 {
			firstDeviceID = device.ID
		}
	}

	t.Run("Logout all other devices", func(t *testing.T) {
		err := svc.LogoutAllOtherDevices(ctx, 1, firstDeviceID)
		// May not return error
		_ = err
		t.Logf("LogoutAllOtherDevices returned: %v", err)
	})
}

func TestDeviceService_GetAllDevicesCursor(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	// Create multiple devices
	for i := 0; i < 5; i++ {
		req := &service.CreateDeviceRequest{
			DeviceID: "cursor_device_" + string(rune('a'+i)),
		}
		svc.CreateDevice(ctx, 1, req)
	}

	t.Run("Get all devices with cursor", func(t *testing.T) {
		req := &service.GetAllDevicesRequest{
			Cursor: "",
			Size:   3,
		}
		resp, err := svc.GetAllDevicesCursor(ctx, req)
		if err != nil {
			t.Fatalf("GetAllDevicesCursor failed: %v", err)
		}
		if resp == nil {
			t.Error("Expected response")
		}
	})
}

func TestDeviceService_GetDeviceByDeviceID(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	req := &service.CreateDeviceRequest{
		DeviceID: "get_by_device_id",
	}
	svc.CreateDevice(ctx, 1, req)

	t.Run("Get device by device ID", func(t *testing.T) {
		device, err := svc.GetDeviceByDeviceID(ctx, 1, "get_by_device_id")
		if err != nil {
			t.Fatalf("GetDeviceByDeviceID failed: %v", err)
		}
		if device.DeviceID != "get_by_device_id" {
			t.Errorf("Expected device ID 'get_by_device_id', got %s", device.DeviceID)
		}
	})

	t.Run("Get non-existent device by device ID", func(t *testing.T) {
		_, err := svc.GetDeviceByDeviceID(ctx, 1, "not_exist")
		if err == nil {
			t.Error("Expected error for non-existent device")
		}
	})
}

// =============================================================================
// Get Active Devices Extended Tests
// =============================================================================

func TestDeviceService_GetActiveDevices_Extended(t *testing.T) {
	svc, _ := setupDeviceTestEnv(t)
	ctx := context.Background()

	t.Run("Get active devices with pagination", func(t *testing.T) {
		// Create some devices
		for i := 0; i < 5; i++ {
			req := &service.CreateDeviceRequest{
				DeviceID:   "active_device_paged_" + string(rune('0'+i)),
				DeviceName: "Device " + string(rune('0'+i)),
			}
			svc.CreateDevice(ctx, 1, req)
		}

		devices, total, err := svc.GetActiveDevices(ctx, 1, 3)
		if err != nil {
			t.Fatalf("GetActiveDevices failed: %v", err)
		}
		if len(devices) > 3 {
			t.Errorf("Expected at most 3 devices, got %d", len(devices))
		}
		_ = total
	})
}