package api

import (
	"context"
	"os"
	"path/filepath"
	"testing"

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

	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
)

func TestAudioContentType(t *testing.T) {
	cases := map[string]string{
		"mp3":     "audio/mpeg",
		"MP3":     "audio/mpeg",
		"flac":    "audio/flac",
		"ogg":     "audio/ogg",
		"opus":    "audio/ogg",
		"m4a":     "audio/mp4",
		"aac":     "audio/aac",
		"wav":     "audio/wav",
		"unknown": "application/octet-stream",
		"":        "application/octet-stream",
	}
	for in, want := range cases {
		if got := audioContentType(in); got != want {
			t.Errorf("audioContentType(%q) = %q, want %q", in, got, want)
		}
	}
}

func TestImageContentType(t *testing.T) {
	cases := map[string]string{
		"/a/cover.jpg":  "image/jpeg",
		"/a/cover.JPG":  "image/jpeg",
		"/a/cover.jpeg": "image/jpeg",
		"/a/cover.png":  "image/png",
		"/a/cover.webp": "image/webp",
		"/a/cover.gif":  "image/gif",
		"/a/cover.bmp":  "application/octet-stream",
		"/a/cover":      "application/octet-stream",
	}
	for in, want := range cases {
		if got := imageContentType(in); got != want {
			t.Errorf("imageContentType(%q) = %q, want %q", in, got, want)
		}
	}
}

func TestFindSidecarCover_PrefersCoverOverFolder(t *testing.T) {
	dir := t.TempDir()
	if err := os.WriteFile(filepath.Join(dir, "cover.jpg"), []byte("c"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "folder.jpg"), []byte("f"), 0o644); err != nil {
		t.Fatal(err)
	}
	got := findSidecarCover(filepath.Join(dir, "any-track.flac"))
	if got != filepath.Join(dir, "cover.jpg") {
		t.Errorf("got %q, want cover.jpg path", got)
	}
}

func TestFindSidecarCover_FallsBackToFolder(t *testing.T) {
	dir := t.TempDir()
	if err := os.WriteFile(filepath.Join(dir, "folder.png"), []byte("f"), 0o644); err != nil {
		t.Fatal(err)
	}
	got := findSidecarCover(filepath.Join(dir, "t.flac"))
	if got != filepath.Join(dir, "folder.png") {
		t.Errorf("got %q, want folder.png path", got)
	}
}

func TestFindSidecarCover_NoneFound(t *testing.T) {
	dir := t.TempDir()
	if got := findSidecarCover(filepath.Join(dir, "t.flac")); got != "" {
		t.Errorf("got %q, want empty string", got)
	}
}

func TestResolveAlbumCoverPath_ExplicitPresent(t *testing.T) {
	_, pool := testHandlers(t)
	truncateLibrary(t, pool)
	artist := seedArtist(t, pool, "A")
	album := seedAlbum(t, pool, artist.ID, "X", 0)

	dir := t.TempDir()
	explicit := filepath.Join(dir, "explicit.jpg")
	if err := os.WriteFile(explicit, []byte("e"), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := pool.Exec(context.Background(),
		`UPDATE albums SET cover_art_path = $1 WHERE id = $2`, explicit, album.ID); err != nil {
		t.Fatalf("UPDATE albums: %v", err)
	}
	got := resolveAlbumCoverPath(context.Background(), dbq.New(pool), fetchAlbum(t, pool, album.ID))
	if got != explicit {
		t.Errorf("got %q, want %q", got, explicit)
	}
}

func TestResolveAlbumCoverPath_ExplicitMissingFallsThroughToSidecar(t *testing.T) {
	_, pool := testHandlers(t)
	truncateLibrary(t, pool)
	artist := seedArtist(t, pool, "A")
	album := seedAlbum(t, pool, artist.ID, "X", 0)

	_, dir := seedTrackWithFile(t, pool, album.ID, artist.ID, "t", []byte("audio"), "mp3")
	sidecar := filepath.Join(dir, "cover.jpg")
	if err := os.WriteFile(sidecar, []byte("s"), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := pool.Exec(context.Background(),
		`UPDATE albums SET cover_art_path = $1 WHERE id = $2`,
		filepath.Join(dir, "does-not-exist.jpg"), album.ID); err != nil {
		t.Fatalf("UPDATE albums: %v", err)
	}

	got := resolveAlbumCoverPath(context.Background(), dbq.New(pool), fetchAlbum(t, pool, album.ID))
	if got != sidecar {
		t.Errorf("got %q, want %q", got, sidecar)
	}
}

func TestResolveAlbumCoverPath_NoArt(t *testing.T) {
	_, pool := testHandlers(t)
	truncateLibrary(t, pool)
	artist := seedArtist(t, pool, "A")
	album := seedAlbum(t, pool, artist.ID, "X", 0)
	seedTrack(t, pool, album.ID, artist.ID, "t", 1, 1000)
	got := resolveAlbumCoverPath(context.Background(), dbq.New(pool), album)
	if got != "" {
		t.Errorf("got %q, want empty string", got)
	}
}

// fetchAlbum reloads the album row so tests see updates made via raw SQL.
func fetchAlbum(t *testing.T, pool *pgxpool.Pool, id pgtype.UUID) dbq.Album {
	t.Helper()
	a, err := dbq.New(pool).GetAlbumByID(context.Background(), id)
	if err != nil {
		t.Fatalf("GetAlbumByID: %v", err)
	}
	return a
}