package service

import (
	"fmt"
	"testing"
	"time"

	"go.uber.org/zap"

	"github.com/truewhile/MeBox/internal/config"
	"github.com/truewhile/MeBox/internal/model"
	"github.com/truewhile/MeBox/internal/repository"
)

func TestListLibrariesWithPreview(t *testing.T) {
	db := newServiceTestDB(t, &model.Library{}, &model.Media{})
	repos := repository.New(db)

	lib1 := model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true}
	if err := repos.Library.Create(t.Context(), &lib1); err != nil {
		t.Fatal(err)
	}
	lib2 := model.Library{Name: "动漫", Path: "/media/anime", Type: "anime", Enabled: true}
	if err := repos.Library.Create(t.Context(), &lib2); err != nil {
		t.Fatal(err)
	}

	now := time.Date(2026, 7, 2, 12, 0, 0, 0, time.UTC)
	var rows []model.Media

	// Add 5 movies to lib1
	for i := 1; i <= 5; i++ {
		rows = append(rows, model.Media{
			Base:      model.Base{ID: fmt.Sprintf("movie-%02d", i), CreatedAt: now.Add(time.Duration(i) * time.Hour)},
			LibraryID: lib1.ID,
			Title:     fmt.Sprintf("电影%d", i),
			Path:      fmt.Sprintf("/media/movies/电影%d/movie%d.mp4", i, i),
			PosterURL: fmt.Sprintf("/api/media/movie-%02d/poster", i),
		})
	}

	// Add 12 episodes of 1 anime to lib2
	for i := 1; i <= 12; i++ {
		rows = append(rows, model.Media{
			Base:       model.Base{ID: fmt.Sprintf("anime-ep-%02d", i), CreatedAt: now.Add(time.Duration(i) * time.Minute)},
			LibraryID:  lib2.ID,
			Title:      fmt.Sprintf("某动漫 第%d集", i),
			Path:       fmt.Sprintf("/media/anime/某动漫/Season 01/某动漫.S01E%02d.mp4", i),
			SeasonNum:  1,
			EpisodeNum: i,
			PosterURL:  "/api/media/anime-01/poster",
		})
	}

	if err := repos.DB.Create(&rows).Error; err != nil {
		t.Fatal(err)
	}

	svc := NewMediaService(&config.Config{}, zap.NewNop(), repos)

	previews, err := svc.ListLibrariesWithPreview(t.Context(), []model.Library{lib1, lib2}, MediaVisibility{IncludeNSFW: true}, 10)
	if err != nil {
		t.Fatalf("ListLibrariesWithPreview failed: %v", err)
	}

	if len(previews) != 2 {
		t.Fatalf("got %d previews, want 2", len(previews))
	}

	// Verify lib1 (movies)
	if previews[0].ID != lib1.ID {
		t.Errorf("preview[0].ID = %q, want %q", previews[0].ID, lib1.ID)
	}
	if previews[0].Total != 5 {
		t.Errorf("preview[0].Total = %d, want 5", previews[0].Total)
	}
	if len(previews[0].Cards) != 5 {
		t.Errorf("preview[0].Cards count = %d, want 5", len(previews[0].Cards))
	}

	// Verify lib2 (anime)
	if previews[1].ID != lib2.ID {
		t.Errorf("preview[1].ID = %q, want %q", previews[1].ID, lib2.ID)
	}
	if previews[1].Total != 12 {
		t.Errorf("preview[1].Total = %d, want 12", previews[1].Total)
	}
	// 12 episodes should be grouped into 1 SeriesCard with Count = 12
	if len(previews[1].Cards) != 1 {
		t.Errorf("preview[1].Cards count = %d, want 1", len(previews[1].Cards))
	} else if previews[1].Cards[0].Count != 12 {
		t.Errorf("preview[1].Cards[0].Count = %d, want 12", previews[1].Cards[0].Count)
	}
}

func TestListLibrariesWithPreviewLongSeriesCompletion(t *testing.T) {
	db := newServiceTestDB(t, &model.Library{}, &model.Media{})
	repos := repository.New(db)

	lib := model.Library{Name: "剧集库", Path: "/media/tv", Type: "tv", Enabled: true}
	if err := repos.Library.Create(t.Context(), &lib); err != nil {
		t.Fatal(err)
	}

	now := time.Date(2026, 7, 2, 12, 0, 0, 0, time.UTC)
	var rows []model.Media

	// 1. 添加一部更早入库的短剧（2 集），如果按窗口 60 条限制，排在第 70 集之后，无法被初始窗口截取
	for i := 1; i <= 2; i++ {
		rows = append(rows, model.Media{
			Base:       model.Base{ID: fmt.Sprintf("short-ep-%02d", i), CreatedAt: now.Add(-time.Duration(100-i) * time.Minute)},
			LibraryID:  lib.ID,
			Title:      fmt.Sprintf("经典短剧 第%d集", i),
			Path:       fmt.Sprintf("/media/tv/经典短剧/Season 01/经典短剧.S01E%02d.mp4", i),
			SeasonNum:  1,
			EpisodeNum: i,
		})
	}

	// 2. 添加一部最新入库的 70 集长篇连续剧，这 70 篇全在新入库时间线上
	for i := 1; i <= 70; i++ {
		rows = append(rows, model.Media{
			Base:       model.Base{ID: fmt.Sprintf("long-ep-%02d", i), CreatedAt: now.Add(time.Duration(i) * time.Minute)},
			LibraryID:  lib.ID,
			Title:      fmt.Sprintf("大长篇连续剧 第%d集", i),
			Path:       fmt.Sprintf("/media/tv/大长篇连续剧/Season 01/大长篇连续剧.S01E%02d.mp4", i),
			SeasonNum:  1,
			EpisodeNum: i,
		})
	}

	if err := repos.DB.Create(&rows).Error; err != nil {
		t.Fatal(err)
	}

	svc := NewMediaService(&config.Config{}, zap.NewNop(), repos)

	// 请求 10 部卡片
	previews, err := svc.ListLibrariesWithPreview(t.Context(), []model.Library{lib}, MediaVisibility{IncludeNSFW: true}, 10)
	if err != nil {
		t.Fatalf("ListLibrariesWithPreview failed: %v", err)
	}

	if len(previews) != 1 {
		t.Fatalf("got %d previews, want 1", len(previews))
	}

	// 总媒体行数是 72 行
	if previews[0].Total != 72 {
		t.Errorf("previews[0].Total = %d, want 72", previews[0].Total)
	}

	// 验证自适应补全机制：必须包含 2 部剧集（长篇 + 短剧），而不是因为长篇 70 集占满窗口只显示 1 部
	if len(previews[0].Cards) != 2 {
		t.Fatalf("previews[0].Cards count = %d, want 2", len(previews[0].Cards))
	}
}

func TestListLibraryPreviewsSkipsTotals(t *testing.T) {
	db := newServiceTestDB(t, &model.Library{}, &model.Media{})
	repos := repository.New(db)
	lib := model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true}
	if err := repos.Library.Create(t.Context(), &lib); err != nil {
		t.Fatal(err)
	}
	if err := repos.DB.Create(&model.Media{
		LibraryID: lib.ID,
		Title:     "预览电影",
		Path:      "/media/movies/预览电影.mkv",
	}).Error; err != nil {
		t.Fatal(err)
	}

	svc := NewMediaService(&config.Config{}, zap.NewNop(), repos)
	previews, err := svc.ListLibraryPreviews(t.Context(), []model.Library{lib}, MediaVisibility{IncludeNSFW: true}, 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(previews) != 1 || previews[0].Total != 0 || len(previews[0].Cards) != 1 {
		t.Fatalf("preview-only result = %#v, want one card and no count", previews)
	}
}

func TestListLibraryPreviewsCachesEachLibraryIndependently(t *testing.T) {
	db := newServiceTestDB(t, &model.Library{}, &model.Media{})
	repos := repository.New(db)
	lib := model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true}
	if err := repos.Library.Create(t.Context(), &lib); err != nil {
		t.Fatal(err)
	}
	if err := repos.DB.Create(&model.Media{
		LibraryID: lib.ID,
		Title:     "预览电影",
		Path:      "/media/movies/预览电影.mkv",
	}).Error; err != nil {
		t.Fatal(err)
	}

	svc := NewMediaService(&config.Config{}, zap.NewNop(), repos).
		SetRuntimeCache(NewRuntimeCacheService(&config.Config{}, zap.NewNop()))
	visibility := MediaVisibility{IncludeNSFW: true}
	if _, err := svc.ListLibraryPreviews(t.Context(), []model.Library{lib}, visibility, 10); err != nil {
		t.Fatal(err)
	}
	filter := repository.MediaQueryFilter{IncludeNSFW: true}
	key := svc.libraryPreviewCacheKey([]model.Library{lib}, 10, filter, false)
	var cached LibraryPreviewItem
	if !svc.cache.GetJSON(t.Context(), key, &cached) || len(cached.Cards) != 1 {
		t.Fatalf("per-library preview cache = %#v, want one cached card", cached)
	}
}