package bookstore_test

import (
	"context"
	"io"
	"testing"
	"time"

	"github.com/libnovel/backend/internal/bookstore"
	"github.com/libnovel/backend/internal/domain"
)

// ── Mock that satisfies all bookstore interfaces ──────────────────────────────

type mockStore struct{}

// BookWriter
func (m *mockStore) WriteMetadata(_ context.Context, _ domain.BookMeta) error         { return nil }
func (m *mockStore) WriteChapter(_ context.Context, _ string, _ domain.Chapter) error { return nil }
func (m *mockStore) WriteChapterRefs(_ context.Context, _ string, _ []domain.ChapterRef) error {
	return nil
}
func (m *mockStore) ChapterExists(_ context.Context, _ string, _ domain.ChapterRef) bool {
	return false
}

// BookReader
func (m *mockStore) ReadMetadata(_ context.Context, _ string) (domain.BookMeta, bool, error) {
	return domain.BookMeta{}, false, nil
}
func (m *mockStore) ListBooks(_ context.Context) ([]domain.BookMeta, error) { return nil, nil }
func (m *mockStore) LocalSlugs(_ context.Context) (map[string]bool, error) {
	return map[string]bool{}, nil
}
func (m *mockStore) MetadataMtime(_ context.Context, _ string) int64 { return 0 }
func (m *mockStore) ReadChapter(_ context.Context, _ string, _ int) (string, error) {
	return "", nil
}
func (m *mockStore) ListChapters(_ context.Context, _ string) ([]domain.ChapterInfo, error) {
	return nil, nil
}
func (m *mockStore) CountChapters(_ context.Context, _ string) int                { return 0 }
func (m *mockStore) ReindexChapters(_ context.Context, _ string) (int, error)     { return 0, nil }
func (m *mockStore) DeduplicateChapters(_ context.Context, _ string) (int, error) { return 0, nil }

// RankingStore
func (m *mockStore) WriteRankingItem(_ context.Context, _ domain.RankingItem) error { return nil }
func (m *mockStore) ReadRankingItems(_ context.Context) ([]domain.RankingItem, error) {
	return nil, nil
}
func (m *mockStore) RankingFreshEnough(_ context.Context, _ time.Duration) (bool, error) {
	return false, nil
}

// AudioStore
func (m *mockStore) AudioObjectKey(_ string, _ int, _ string) string       { return "" }
func (m *mockStore) AudioObjectKeyExt(_ string, _ int, _, _ string) string { return "" }
func (m *mockStore) AudioExists(_ context.Context, _ string) bool          { return false }
func (m *mockStore) PutAudio(_ context.Context, _ string, _ []byte) error  { return nil }
func (m *mockStore) PutAudioStream(_ context.Context, _ string, _ io.Reader, _ int64, _ string) error {
	return nil
}

// PresignStore
func (m *mockStore) PresignChapter(_ context.Context, _ string, _ int, _ time.Duration) (string, error) {
	return "", nil
}
func (m *mockStore) PresignAudio(_ context.Context, _ string, _ time.Duration) (string, error) {
	return "", nil
}
func (m *mockStore) PresignAvatarUpload(_ context.Context, _, _ string) (string, string, error) {
	return "", "", nil
}
func (m *mockStore) PresignAvatarURL(_ context.Context, _ string) (string, bool, error) {
	return "", false, nil
}
func (m *mockStore) PutAvatar(_ context.Context, _, _, _ string, _ []byte) (string, error) {
	return "", nil
}
func (m *mockStore) DeleteAvatar(_ context.Context, _ string) error { return nil }

// ProgressStore
func (m *mockStore) GetProgress(_ context.Context, _, _ string) (domain.ReadingProgress, bool) {
	return domain.ReadingProgress{}, false
}
func (m *mockStore) SetProgress(_ context.Context, _ string, _ domain.ReadingProgress) error {
	return nil
}
func (m *mockStore) AllProgress(_ context.Context, _ string) ([]domain.ReadingProgress, error) {
	return nil, nil
}
func (m *mockStore) DeleteProgress(_ context.Context, _, _ string) error { return nil }

// ── Compile-time interface satisfaction ───────────────────────────────────────

var _ bookstore.BookWriter = (*mockStore)(nil)
var _ bookstore.BookReader = (*mockStore)(nil)
var _ bookstore.RankingStore = (*mockStore)(nil)
var _ bookstore.AudioStore = (*mockStore)(nil)
var _ bookstore.PresignStore = (*mockStore)(nil)
var _ bookstore.ProgressStore = (*mockStore)(nil)

// ── Behavioural tests ─────────────────────────────────────────────────────────

func TestBookWriter_WriteMetadata_ReturnsNilError(t *testing.T) {
	var w bookstore.BookWriter = &mockStore{}
	if err := w.WriteMetadata(context.Background(), domain.BookMeta{Slug: "test"}); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestBookReader_ReadMetadata_NotFound(t *testing.T) {
	var r bookstore.BookReader = &mockStore{}
	_, found, err := r.ReadMetadata(context.Background(), "unknown")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if found {
		t.Error("expected not found")
	}
}

func TestRankingStore_RankingFreshEnough_ReturnsFalse(t *testing.T) {
	var s bookstore.RankingStore = &mockStore{}
	fresh, err := s.RankingFreshEnough(context.Background(), time.Hour)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if fresh {
		t.Error("expected false")
	}
}

func TestAudioStore_AudioExists_ReturnsFalse(t *testing.T) {
	var s bookstore.AudioStore = &mockStore{}
	if s.AudioExists(context.Background(), "audio/slug/1/af_bella.mp3") {
		t.Error("expected false")
	}
}

func TestProgressStore_GetProgress_NotFound(t *testing.T) {
	var s bookstore.ProgressStore = &mockStore{}
	_, found := s.GetProgress(context.Background(), "session-1", "slug")
	if found {
		t.Error("expected not found")
	}
}
