package repository_test

import (
	"context"
	"fmt"
	"os"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/topfans/backend/services/notificationService/model"
	"github.com/topfans/backend/services/notificationService/repository"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)

// setupTestDB 打开测试 DB；若 TEST_DB_DSN 未设置或连不上则 t.Skip。
func setupTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	dsn := os.Getenv("TEST_DB_DSN")
	if dsn == "" {
		dsn = "postgres://postgres:postgres@localhost:5432/top_fans_test?sslmode=disable"
	}
	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
	if err != nil {
		t.Skipf("skipping: cannot open test DB: %v", err)
	}
	sqlDB, err := db.DB()
	if err != nil {
		t.Skipf("skipping: cannot get sql.DB from gorm: %v", err)
	}
	if err := sqlDB.Ping(); err != nil {
		t.Skipf("skipping: cannot ping test DB: %v", err)
	}
	return db
}

// cleanupTestData 删除指定 user+star 的所有测试数据。
func cleanupTestData(t *testing.T, db *gorm.DB, userID, starID int64) {
	t.Helper()
	ctx := context.Background()
	if err := db.WithContext(ctx).Exec(
		`DELETE FROM public.notifications WHERE user_id=$1 AND star_id=$2`, userID, starID).Error; err != nil {
		t.Logf("cleanup notifications failed: %v", err)
	}
	if err := db.WithContext(ctx).Exec(
		`DELETE FROM public.notification_stats WHERE user_id=$1 AND star_id=$2`, userID, starID).Error; err != nil {
		t.Logf("cleanup notification_stats failed: %v", err)
	}
}

// TestNotificationRepository_CreateAndList 验证：单条 like 创建、列表查询、统计 +1。
func TestNotificationRepository_CreateAndList(t *testing.T) {
	db := setupTestDB(t)
	repo := repository.NewNotificationRepository(db)
	statsRepo := repository.NewNotificationStatsRepository(db)
	ctx := context.Background()

	userID, starID := int64(990001), int64(1)
	cleanupTestData(t, db, userID, starID)
	defer cleanupTestData(t, db, userID, starID)

	now := time.Now().UnixMilli()

	var id int64
	err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		newID, err := repo.Create(ctx, tx, &model.Notification{
			UserID: userID, StarID: starID, Type: "like",
			Title: "新点赞", Content: "test", Data: `{}`,
			CreatedAt: now,
		})
		if err != nil {
			return err
		}
		id = newID
		return statsRepo.IncrementByType(ctx, tx, userID, starID, "like", now)
	})
	assert.NoError(t, err)
	assert.Greater(t, id, int64(0))

	items, total, err := repo.ListSystemActivity(ctx, userID, starID, "like", "", 1, 20)
	assert.NoError(t, err)
	assert.Equal(t, int64(1), total)
	if assert.Len(t, items, 1) {
		assert.Equal(t, id, items[0].ID)
	}

	stats, err := statsRepo.Get(ctx, userID, starID)
	assert.NoError(t, err)
	if assert.NotNil(t, stats) {
		assert.Equal(t, 1, stats.LikeUnreadCount)
		assert.Equal(t, 1, stats.TotalUnreadCount)
	}
}

// TestNotificationRepository_LikeAggregation 验证：5 条 like（同一 target_id）聚合成 1 条。
func TestNotificationRepository_LikeAggregation(t *testing.T) {
	db := setupTestDB(t)
	repo := repository.NewNotificationRepository(db)
	ctx := context.Background()

	userID, starID, targetID := int64(990002), int64(1), int64(8888)
	cleanupTestData(t, db, userID, starID)
	defer cleanupTestData(t, db, userID, starID)

	now := time.Now().UnixMilli()
	for i := 0; i < 5; i++ {
		err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
			_, err := repo.Create(ctx, tx, &model.Notification{
				UserID: userID, StarID: starID, Type: "like",
				Title: "新点赞",
				Data: fmt.Sprintf(`{"target_id": %d, "actor_id": %d, "actor_name": "测试%d", "actor_avatar": "https://x/a.png"}`,
					targetID, 1000+i, i),
				CreatedAt: now + int64(i)*1000,
			})
			return err
		})
		assert.NoError(t, err)
	}

	items, total, err := repo.ListLikesAggregated(ctx, userID, starID, "", 1, 20)
	assert.NoError(t, err)
	assert.Equal(t, int64(1), total)
	if assert.Len(t, items, 1) {
		assert.Equal(t, int32(5), items[0].TotalCount)
		assert.Equal(t, targetID, items[0].TargetID)
		assert.Len(t, items[0].Actors, 5)
	}
}

// TestNotificationRepository_MarkAsReadByTarget 验证：标 target 已读影响 3 条，统计 -3。
func TestNotificationRepository_MarkAsReadByTarget(t *testing.T) {
	db := setupTestDB(t)
	repo := repository.NewNotificationRepository(db)
	statsRepo := repository.NewNotificationStatsRepository(db)
	ctx := context.Background()

	userID, starID, targetID := int64(990003), int64(1), int64(7777)
	cleanupTestData(t, db, userID, starID)
	defer cleanupTestData(t, db, userID, starID)

	now := time.Now().UnixMilli()
	for i := 0; i < 3; i++ {
		err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
			_, err := repo.Create(ctx, tx, &model.Notification{
				UserID: userID, StarID: starID, Type: "like",
				Title: "x",
				Data:  fmt.Sprintf(`{"target_id": %d, "actor_id": %d, "actor_name": "x", "actor_avatar": ""}`, targetID, i+1),
			})
			if err != nil {
				return err
			}
			return statsRepo.IncrementByType(ctx, tx, userID, starID, "like", now)
		})
		assert.NoError(t, err)
	}

	var affected int32
	err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		a, err := repo.MarkAsReadByTarget(ctx, tx, userID, starID, targetID, now)
		if err != nil {
			return err
		}
		affected = a
		return statsRepo.DecrementByType(ctx, tx, userID, starID, "like", int(a), now)
	})
	assert.NoError(t, err)
	assert.Equal(t, int32(3), affected)

	stats, err := statsRepo.Get(ctx, userID, starID)
	assert.NoError(t, err)
	if assert.NotNil(t, stats) {
		assert.Equal(t, 0, stats.LikeUnreadCount)
		assert.Equal(t, 0, stats.TotalUnreadCount)
	}
}