package service

import (
	"context"
	"encoding/json"
	"testing"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
)

// setupWebhookSubscriptionService 创建 WebhookSubscriptionRepo + WebhookSubscriptionService 测试实例。
func setupWebhookSubscriptionService(t *testing.T) (*gorm.DB, *repository.WebhookSubscriptionRepo, *WebhookSubscriptionService) {
	t.Helper()
	db := setupServiceTestDB(t)
	repo := repository.NewWebhookSubscriptionRepo(db)
	svc := NewWebhookSubscriptionService(repo)
	return db, repo, svc
}

// createTestWebhookSubscription 在数据库中创建一个测试 WebhookSubscription 并返回。
func createTestWebhookSubscription(t *testing.T, db *gorm.DB, accountID uint, url string, events []string) *model.WebhookSubscription {
	t.Helper()
	eventsJSON, err := json.Marshal(events)
	if err != nil {
		t.Fatalf("无法序列化事件列表: %v", err)
	}
	sub := &model.WebhookSubscription{
		AccountID: accountID,
		URL:       url,
		Events:    eventsJSON,
		Secret:    "test-secret-key",
		Active:    true,
	}
	if err := db.Create(sub).Error; err != nil {
		t.Fatalf("无法创建测试 Webhook 订阅: %v", err)
	}
	return sub
}

// ========== ListSubscriptions ==========

func TestWebhookSubscriptionService_ListSubscriptions_成功(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)

	// 创建多个订阅
	createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook1", []string{"message_created"})
	createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook2", []string{"conversation_created"})

	subs, err := svc.ListSubscriptions(context.Background(), account.ID)
	require.NoError(t, err)
	assert.Len(t, subs, 2)
}

func TestWebhookSubscriptionService_ListSubscriptions_无订阅(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)

	subs, err := svc.ListSubscriptions(context.Background(), account.ID)
	require.NoError(t, err)
	assert.Len(t, subs, 0)
}

// ========== CreateSubscription ==========

func TestWebhookSubscriptionService_CreateSubscription_成功(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)

	events := []string{"message_created", "conversation_created"}
	sub, err := svc.CreateSubscription(context.Background(), account.ID, "https://example.com/webhook", events)
	require.NoError(t, err)
	assert.Equal(t, account.ID, sub.AccountID)
	assert.Equal(t, "https://example.com/webhook", sub.URL)
	assert.True(t, sub.Active)
	assert.NotZero(t, sub.ID)

	// 验证 secret 已自动生成
	assert.NotEmpty(t, sub.Secret)
	assert.Len(t, sub.Secret, 64) // 32 bytes hex-encoded = 64 chars

	// 验证 Events 是有效的 JSON
	var parsedEvents []string
	err = json.Unmarshal(sub.Events, &parsedEvents)
	require.NoError(t, err)
	assert.Equal(t, events, parsedEvents)
}

// ========== UpdateSubscription ==========

func TestWebhookSubscriptionService_UpdateSubscription_成功(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://old.example.com/hook", []string{"message_created"})

	newURL := "https://new.example.com/hook"
	newEvents := []string{"conversation_created", "message_updated"}
	updated, err := svc.UpdateSubscription(context.Background(), sub.ID, newURL, newEvents, true)
	require.NoError(t, err)
	assert.Equal(t, newURL, updated.URL)

	// 验证 Events 已更新
	var parsedEvents []string
	err = json.Unmarshal(updated.Events, &parsedEvents)
	require.NoError(t, err)
	assert.Equal(t, newEvents, parsedEvents)
	assert.True(t, updated.Active)
}

func TestWebhookSubscriptionService_UpdateSubscription_仅URL(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://old.example.com/hook", []string{"message_created"})

	updated, err := svc.UpdateSubscription(context.Background(), sub.ID, "https://updated.example.com/hook", nil, true)
	require.NoError(t, err)
	assert.Equal(t, "https://updated.example.com/hook", updated.URL)

	// Events 应保持不变
	var parsedEvents []string
	err = json.Unmarshal(updated.Events, &parsedEvents)
	require.NoError(t, err)
	assert.Equal(t, []string{"message_created"}, parsedEvents)
}

func TestWebhookSubscriptionService_UpdateSubscription_不存在(t *testing.T) {
	_, _, svc := setupWebhookSubscriptionService(t)

	updated, err := svc.UpdateSubscription(context.Background(), 9999, "https://example.com/hook", []string{"event"}, true)
	assert.Error(t, err)
	assert.Nil(t, updated)
}

// ========== DeleteSubscription ==========

func TestWebhookSubscriptionService_DeleteSubscription_成功(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook", []string{"message_created"})

	err := svc.DeleteSubscription(context.Background(), sub.ID)
	require.NoError(t, err)

	// 验证订阅已被删除
	var count int64
	db.Model(&model.WebhookSubscription{}).Where("id = ?", sub.ID).Count(&count)
	assert.Equal(t, int64(0), count)
}

func TestWebhookSubscriptionService_DeleteSubscription_不存在(t *testing.T) {
	_, _, svc := setupWebhookSubscriptionService(t)

	err := svc.DeleteSubscription(context.Background(), 9999)
	assert.Error(t, err)
}

// ========== GetSubscription ==========

func TestWebhookSubscriptionService_GetSubscription_成功(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook", []string{"message_created"})

	result, err := svc.GetSubscription(context.Background(), sub.ID)
	require.NoError(t, err)
	assert.Equal(t, sub.ID, result.ID)
	assert.Equal(t, sub.URL, result.URL)
	assert.Equal(t, account.ID, result.AccountID)
}

func TestWebhookSubscriptionService_GetSubscription_不存在(t *testing.T) {
	_, _, svc := setupWebhookSubscriptionService(t)

	result, err := svc.GetSubscription(context.Background(), 9999)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== ListDeliveries ==========

func TestWebhookSubscriptionService_ListDeliveries_成功(t *testing.T) {
	db, repo, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook", []string{"message_created"})

	// 直接通过 repo 创建投递记录
	ctx := context.Background()
	delivery1 := &model.WebhookDelivery{
		SubscriptionID: sub.ID,
		EventType:      "message_created",
		Payload:        json.RawMessage(`{"id":1}`),
		Status:         "success",
		Attempts:       1,
	}
	require.NoError(t, repo.CreateDelivery(ctx, delivery1))

	delivery2 := &model.WebhookDelivery{
		SubscriptionID: sub.ID,
		EventType:      "conversation_created",
		Payload:        json.RawMessage(`{"id":2}`),
		Status:         "pending",
		Attempts:       0,
	}
	require.NoError(t, repo.CreateDelivery(ctx, delivery2))

	deliveries, err := svc.ListDeliveries(context.Background(), sub.ID, 10)
	require.NoError(t, err)
	assert.Len(t, deliveries, 2)
}

func TestWebhookSubscriptionService_ListDeliveries_无投递记录(t *testing.T) {
	db, _, svc := setupWebhookSubscriptionService(t)
	account := createTestAccount(t, db)
	sub := createTestWebhookSubscription(t, db, account.ID, "https://example.com/hook", []string{"message_created"})

	deliveries, err := svc.ListDeliveries(context.Background(), sub.ID, 10)
	require.NoError(t, err)
	assert.Len(t, deliveries, 0)
}