package playlists_test

import (
	"context"
	"image"
	_ "image/jpeg"
	"os"
	"path/filepath"
	"testing"

	"github.com/jackc/pgx/v5/pgtype"

	"git.fabledsword.com/bvandeusen/minstrel/internal/playlists"
)

func TestGenerateCollage_EmptyPlaylist(t *testing.T) {
	pool := newPool(t)
	user := seedUser(t, pool, "alice")
	dir := t.TempDir()
	svc := playlists.NewService(pool, nil, dir)

	pl, err := svc.Create(context.Background(), user.ID, "Empty", "", false)
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	relPath, err := playlists.GenerateCollage(context.Background(), pool, pl.ID, dir)
	if err != nil {
		t.Fatalf("GenerateCollage: %v", err)
	}
	if relPath != "" {
		t.Errorf("relPath = %q, want \"\" for empty playlist", relPath)
	}
}

func TestGenerateCollage_OneTrack(t *testing.T) {
	pool := newPool(t)
	user := seedUser(t, pool, "alice")
	tk := seedTrack(t, pool, "Roygbiv", "BoC")
	dir := t.TempDir()
	svc := playlists.NewService(pool, nil, dir)

	pl, err := svc.Create(context.Background(), user.ID, "One", "", false)
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	if err := svc.AppendTracks(context.Background(), user.ID, pl.ID, []pgtype.UUID{tk.ID}); err != nil {
		t.Fatalf("AppendTracks: %v", err)
	}

	got, err := svc.Get(context.Background(), user.ID, pl.ID)
	if err != nil {
		t.Fatalf("Get: %v", err)
	}
	if got.CoverPath == nil || *got.CoverPath == "" {
		t.Fatalf("CoverPath empty after append")
	}

	full := filepath.Join(dir, *got.CoverPath)
	f, err := os.Open(full)
	if err != nil {
		t.Fatalf("open collage: %v", err)
	}
	defer func() { _ = f.Close() }()
	img, format, err := image.Decode(f)
	if err != nil {
		t.Fatalf("decode collage: %v", err)
	}
	if format != "jpeg" {
		t.Errorf("format = %q, want jpeg", format)
	}
	if img.Bounds().Dx() != 600 || img.Bounds().Dy() != 600 {
		t.Errorf("dimensions = %dx%d, want 600x600", img.Bounds().Dx(), img.Bounds().Dy())
	}
}