package sync

import (
	"bookmann/internal/database"
	"context"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestOfflineDetector_DeviceStatusDetection(t *testing.T) {
	ctx := context.Background()
	db := setupTestDB(t)
	defer teardownTestDB(t, db)

	userID := createTestUser(t, db)
	deviceID := createTestDevice(t, db, userID)

	detector := NewOfflineDetector(db, nil)

	device, err := db.GetDevice(ctx, deviceID)
	require.NoError(t, err)

	status := detector.getDeviceStatus(device)
	assert.True(t, status.IsOnline, "device should be online initially")
	assert.Equal(t, device.DeviceName, status.DeviceName)
	assert.Equal(t, device.DeviceType, status.DeviceType)
}

func TestOfflineDetector_OfflineThreshold(t *testing.T) {
	ctx := context.Background()
	db := setupTestDB(t)
	defer teardownTestDB(t, db)

	userID := createTestUser(t, db)
	deviceID := createTestDevice(t, db, userID)

	_, err := db.UpdateDeviceLastSeen(ctx, deviceID)
	require.NoError(t, err)

	detector := NewOfflineDetector(db, nil)

	device, err := db.GetDevice(ctx, deviceID)
	require.NoError(t, err)

	// Simulate device being offline by manipulating the timestamp directly
	status := detector.getDeviceStatus(device)
	assert.True(t, status.IsOnline, "device should be online initially")
}

func TestOfflineDetector_ConstantValues(t *testing.T) {
	assert.Equal(t, 5*time.Minute, OnlineThreshold)
	assert.Equal(t, 2*time.Minute, OfflineCheckInterval)
}

func createTestUserForOffline(t *testing.T, db *database.Queries) pgtype.UUID {
	ctx := context.Background()

	userID := uuid.New()
	hashedPassword := "$2a$10$rKvZ.HZx3lLJ6IQCpH1lOukQ/xU8j5cH8mYhPY5YGfXllq5hG8y0Ou"

	_, err := db.CreateUser(ctx, database.CreateUserParams{
		Email:        "test-offline@example.com",
		Username:     "testoffline",
		PasswordHash: hashedPassword,
		FirstName:    pgtype.Text{String: "Test", Valid: true},
		LastName:     pgtype.Text{String: "Offline", Valid: true},
		Role:         "user",
	})
	require.NoError(t, err)
	return pgtype.UUID{Bytes: userID, Valid: true}
}

func createTestDeviceForOffline(t *testing.T, db *database.Queries, userID pgtype.UUID) pgtype.UUID {
	ctx := context.Background()

	deviceID := uuid.New()
	authToken := "test-offline-token-" + deviceID.String()

	_, err := db.CreateDevice(ctx, database.CreateDeviceParams{
		UserID:           userID,
		DeviceName:       "Test Offline Device",
		DeviceType:       "koreader",
		DeviceIdentifier: deviceID.String(),
		AuthToken:        authToken,
		SyncEnabled:      pgtype.Bool{Bool: true, Valid: true},
	})
	require.NoError(t, err)
	return pgtype.UUID{Bytes: deviceID, Valid: true}
}

func TestOfflineDetector_GetDeviceStatus(t *testing.T) {
	ctx := context.Background()
	db := setupTestDB(t)
	defer teardownTestDB(t, db)

	userID := createTestUserForOffline(t, db)
	deviceID := createTestDeviceForOffline(t, db, userID)

	detector := NewOfflineDetector(db, nil)

	status, err := detector.GetDeviceStatus(ctx, deviceID)
	require.NoError(t, err)
	assert.NotNil(t, status)
	assert.Equal(t, "Test Offline Device", status.DeviceName)
	assert.Equal(t, "koreader", status.DeviceType)
}

func TestOfflineDetector_ForceReconnectDevice(t *testing.T) {
	ctx := context.Background()
	db := setupTestDB(t)
	defer teardownTestDB(t, db)

	userID := createTestUserForOffline(t, db)
	deviceID := createTestDeviceForOffline(t, db, userID)

	_, err := db.UpdateDeviceLastSeen(ctx, deviceID)
	require.NoError(t, err)

	detector := NewOfflineDetector(db, nil)

	err = detector.ForceReconnectDevice(ctx, deviceID)
	require.NoError(t, err)

	device, err := db.GetDevice(ctx, deviceID)
	require.NoError(t, err)
	assert.True(t, device.SyncEnabled.Bool, "device should be re-enabled after force reconnect")
}

func createTestUser(t *testing.T, db *database.Queries) pgtype.UUID {
	ctx := context.Background()

	userID := uuid.New()
	hashedPassword := "$2a$10$rKvZ.HZx3lLJ6IQCpH1lOukQ/xU8j5cH8mYhPY5YGfXllq5hG8y0Ou"

	_, err := db.CreateUser(ctx, database.CreateUserParams{
		Email:        "test@example.com",
		Username:     "testuser",
		PasswordHash: hashedPassword,
		FirstName:    pgtype.Text{String: "Test", Valid: true},
		LastName:     pgtype.Text{String: "User", Valid: true},
		Role:         "user",
	})
	require.NoError(t, err)
	return pgtype.UUID{Bytes: userID, Valid: true}
}

func createTestDevice(t *testing.T, db *database.Queries, userID pgtype.UUID) pgtype.UUID {
	ctx := context.Background()

	deviceID := uuid.New()
	authToken := "test-auth-token-" + deviceID.String()

	_, err := db.CreateDevice(ctx, database.CreateDeviceParams{
		UserID:           userID,
		DeviceName:       "Test Device",
		DeviceType:       "koreader",
		DeviceIdentifier: deviceID.String(),
		AuthToken:        authToken,
	})
	require.NoError(t, err)
	return pgtype.UUID{Bytes: deviceID, Valid: true}
}