package access

import (
	"context"
	"errors"
	"testing"
	"time"

	"github.com/Silo-Server/silo-server/internal/models"
	"github.com/Silo-Server/silo-server/internal/userstore"
)

type stubUserRepo struct {
	user *models.User
	err  error
}

func (s stubUserRepo) GetByID(_ context.Context, id int) (*models.User, error) {
	if s.err != nil {
		return nil, s.err
	}
	if s.user == nil || s.user.ID != id {
		return nil, errors.New("user not found")
	}
	return s.user, nil
}

type stubStoreProvider struct {
	store userstore.UserStore
	err   error
}

func (s stubStoreProvider) ForUser(context.Context, int) (userstore.UserStore, error) {
	return s.store, s.err
}
func (s stubStoreProvider) Close() error { return nil }

type stubStore struct {
	profile  *userstore.Profile
	err      error
	settings map[string]string
}

func (s stubStore) CreateProfile(context.Context, userstore.Profile) error { panic("unused") }
func (s stubStore) GetProfile(_ context.Context, id string) (*userstore.Profile, error) {
	if s.err != nil {
		return nil, s.err
	}
	if s.profile == nil || s.profile.ID != id {
		return nil, nil
	}
	return s.profile, nil
}
func (s stubStore) ListProfiles(context.Context) ([]userstore.Profile, error) { panic("unused") }
func (s stubStore) UpdateProfile(context.Context, string, userstore.UpdateProfileInput) error {
	panic("unused")
}
func (s stubStore) DeleteProfile(context.Context, string) error             { panic("unused") }
func (s stubStore) VerifyPIN(context.Context, string, string) (bool, error) { panic("unused") }
func (s stubStore) UpdateProgress(context.Context, string, string, float64, float64, userstore.ProgressThresholds) error {
	panic("unused")
}
func (s stubStore) SetProgress(context.Context, string, string, float64, float64, userstore.ProgressThresholds) error {
	panic("unused")
}
func (s stubStore) SetProgressAt(context.Context, string, string, float64, float64, bool, time.Time) error {
	panic("unused")
}
func (s stubStore) SetProgressIfNewer(context.Context, string, string, float64, float64, bool, time.Time) (bool, error) {
	panic("unused")
}
func (s stubStore) UpdateProgressHints(_ context.Context, _, _ string, _ userstore.VersionHints) error {
	return nil
}
func (s stubStore) MarkWatched(context.Context, string, string, float64) error { panic("unused") }
func (s stubStore) MarkProgressBatch(context.Context, string, []string, time.Time) error {
	panic("unused")
}
func (s stubStore) ClearProgressBatch(context.Context, string, []string, time.Time) error {
	panic("unused")
}
func (s stubStore) ClearProgress(context.Context, string, string) error { panic("unused") }
func (s stubStore) GetProgress(context.Context, string, string) (*userstore.WatchProgress, error) {
	panic("unused")
}
func (s stubStore) ListProgress(context.Context, string, string, int, int) ([]userstore.WatchProgress, error) {
	panic("unused")
}
func (s stubStore) ListProgressByMediaItems(context.Context, string, []string) (map[string]userstore.WatchProgress, error) {
	panic("unused")
}
func (s stubStore) AddHistory(context.Context, userstore.WatchHistoryEntry) error { panic("unused") }
func (s stubStore) AddHistoryIfMissing(context.Context, userstore.WatchHistoryEntry) (bool, error) {
	panic("unused")
}
func (s stubStore) ListHistory(context.Context, string, int, int) ([]userstore.WatchHistoryEntry, error) {
	panic("unused")
}
func (s stubStore) ListCompletedHistory(context.Context, userstore.CompletedHistoryQuery) ([]userstore.WatchHistoryEntry, error) {
	panic("unused")
}
func (s stubStore) RemoveHistoryItems(context.Context, string, []string, time.Time) error {
	panic("unused")
}
func (s stubStore) DeleteHistoryBySource(context.Context, string, []string, userstore.WatchHistorySource) error {
	panic("unused")
}
func (s stubStore) ListHomeDismissals(context.Context, string, string) ([]userstore.HomeItemDismissal, error) {
	panic("unused")
}
func (s stubStore) UpsertHomeDismissal(context.Context, userstore.HomeItemDismissal) error {
	panic("unused")
}
func (s stubStore) DeleteHomeDismissal(context.Context, string, string, string) error {
	panic("unused")
}
func (s stubStore) AddFavorite(context.Context, string, string) error { panic("unused") }
func (s stubStore) AddFavoriteAt(context.Context, string, string, time.Time) error {
	panic("unused")
}
func (s stubStore) RemoveFavorite(context.Context, string, string) error {
	panic("unused")
}
func (s stubStore) ListFavorites(context.Context, string, int, int) ([]userstore.Favorite, error) {
	panic("unused")
}
func (s stubStore) ListFavoritesByMediaItems(context.Context, string, []string) (map[string]bool, error) {
	panic("unused")
}
func (s stubStore) IsFavorite(context.Context, string, string) (bool, error)  { panic("unused") }
func (s stubStore) AddToWatchlist(context.Context, string, string) error      { panic("unused") }
func (s stubStore) RemoveFromWatchlist(context.Context, string, string) error { panic("unused") }
func (s stubStore) ListWatchlist(context.Context, string, int, int) ([]userstore.WatchlistEntry, error) {
	panic("unused")
}
func (s stubStore) ListWatchlistByMediaItems(context.Context, string, []string) (map[string]bool, error) {
	panic("unused")
}
func (s stubStore) InWatchlist(context.Context, string, string) (bool, error) { panic("unused") }
func (s stubStore) CreateCollection(context.Context, userstore.CreateCollectionInput) (*userstore.Collection, error) {
	panic("unused")
}
func (s stubStore) GetCollection(context.Context, string) (*userstore.Collection, error) {
	panic("unused")
}
func (s stubStore) ListCollections(context.Context, string) ([]userstore.Collection, error) {
	panic("unused")
}
func (s stubStore) UpdateCollection(context.Context, userstore.UpdateCollectionInput) error {
	panic("unused")
}
func (s stubStore) DeleteCollection(context.Context, string) error { panic("unused") }
func (s stubStore) AddCollectionItem(context.Context, string, string, int) error {
	panic("unused")
}
func (s stubStore) RemoveCollectionItem(context.Context, string, string) error { panic("unused") }
func (s stubStore) ListCollectionItems(context.Context, string) ([]userstore.CollectionItem, error) {
	panic("unused")
}
func (s stubStore) ReplaceCollectionItems(context.Context, string, []userstore.CollectionItemReplacement) error {
	panic("unused")
}
func (s stubStore) ReorderCollectionItems(context.Context, string, []string) error {
	panic("unused")
}
func (s stubStore) ReorderCollections(context.Context, string, *string, []string) error {
	panic("unused")
}
func (s stubStore) UpdateCollectionSyncState(context.Context, userstore.UpdateCollectionSyncStateInput) error {
	panic("unused")
}
func (s stubStore) ListCollectionGroups(context.Context) ([]userstore.CollectionGroup, error) {
	panic("unused")
}
func (s stubStore) EnsureCollectionGroup(context.Context, string) error { panic("unused") }
func (s stubStore) CreateCollectionGroup(context.Context, string, string, userstore.GroupSortMode) (*userstore.CollectionGroup, error) {
	panic("unused")
}
func (s stubStore) UpdateCollectionGroup(context.Context, string, *string, *string, *userstore.GroupSortMode) (*userstore.CollectionGroup, error) {
	panic("unused")
}
func (s stubStore) DeleteCollectionGroup(context.Context, string) error { panic("unused") }
func (s stubStore) ReorderCollectionGroups(context.Context, []string) error {
	panic("unused")
}
func (s stubStore) ListSectionOverrides(context.Context, string, string, string) ([]userstore.SectionOverride, error) {
	panic("unused")
}
func (s stubStore) SaveSectionOverrides(context.Context, string, string, string, []userstore.SectionOverride) error {
	panic("unused")
}
func (s stubStore) ResetSectionOverrides(context.Context, string, string, string) error {
	panic("unused")
}
func (s stubStore) GetSetting(_ context.Context, key string) (string, error) {
	if s.settings != nil {
		return s.settings[key], nil
	}
	return "", nil
}
func (s stubStore) SetSetting(context.Context, string, string) error               { panic("unused") }
func (s stubStore) DeleteSetting(context.Context, string) error                    { panic("unused") }
func (s stubStore) ListSettings(context.Context) ([]userstore.SettingEntry, error) { panic("unused") }
func (s stubStore) GetDeviceSetting(context.Context, string, string, string) (*userstore.DeviceSettingEntry, error) {
	panic("unused")
}
func (s stubStore) SetDeviceSetting(context.Context, userstore.DeviceSettingEntry) error {
	panic("unused")
}
func (s stubStore) DeleteDeviceSetting(context.Context, string, string, string) error {
	panic("unused")
}
func (s stubStore) DeleteAllDeviceSettings(context.Context, string, string) error { panic("unused") }
func (s stubStore) DeleteDeviceSettingsByKey(context.Context, string) error       { panic("unused") }
func (s stubStore) ListDeviceSettings(context.Context, string) ([]userstore.DeviceSettingEntry, error) {
	panic("unused")
}
func (s stubStore) ListAllDeviceSettings(context.Context) ([]userstore.DeviceSettingEntry, error) {
	panic("unused")
}
func (s stubStore) SetSubtitlePreference(context.Context, userstore.SubtitlePreference) error {
	panic("unused")
}
func (s stubStore) GetSubtitlePreference(context.Context, string, string) (*userstore.SubtitlePreference, error) {
	panic("unused")
}
func (s stubStore) DeleteSubtitlePreference(context.Context, string, string) error { panic("unused") }
func (s stubStore) SetAudioPreference(context.Context, userstore.AudioPreference) error {
	panic("unused")
}
func (s stubStore) GetAudioPreference(context.Context, string, string) (*userstore.AudioPreference, error) {
	panic("unused")
}
func (s stubStore) DeleteAudioPreference(context.Context, string, string) error { panic("unused") }
func (s stubStore) SetSeriesPlaybackPreference(context.Context, userstore.SeriesPlaybackPreference) error {
	panic("unused")
}
func (s stubStore) GetSeriesPlaybackPreference(context.Context, string, string) (*userstore.SeriesPlaybackPreference, error) {
	panic("unused")
}
func (s stubStore) DeleteSeriesPlaybackPreference(context.Context, string, string) error {
	panic("unused")
}
func (s stubStore) GetLibraryPlaybackPreference(context.Context, string, int) (*userstore.LibraryPlaybackPreference, error) {
	panic("unused")
}
func (s stubStore) ListLibraryPlaybackPreferences(context.Context, string) ([]userstore.LibraryPlaybackPreference, error) {
	panic("unused")
}
func (s stubStore) UpsertLibraryPlaybackPreference(context.Context, userstore.LibraryPlaybackPreference) error {
	panic("unused")
}
func (s stubStore) DeleteLibraryPlaybackPreference(context.Context, string, int) error {
	panic("unused")
}

func TestResolver_UnrestrictedAccountRestrictedProfile(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, AccessPolicyRevision: 5}},
		stubStoreProvider{store: stubStore{profile: &userstore.Profile{
			ID:                         "prof-1",
			LibraryRestrictionsEnabled: true,
			AllowedLibraryIDs:          []int{2, 4},
			MaxContentRating:           "PG-13",
			MaxPlaybackQuality:         "720p",
		}}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{
		UserID:    1,
		SessionID: "sess-1",
		ProfileID: "prof-1",
	})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	if !scope.LibrariesRestricted || len(scope.AllowedLibraryIDs) != 2 || scope.AllowedLibraryIDs[0] != 2 || scope.AllowedLibraryIDs[1] != 4 {
		t.Fatalf("unexpected scope libraries: %+v", scope)
	}
	if scope.MaxContentRating != "PG-13" || scope.MaxPlaybackQuality != "1080p" {
		t.Fatalf("unexpected scope ceilings: %+v", scope)
	}
}

func TestResolver_RestrictedAccountInheritingProfile(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, LibraryIDs: []int{1, 3}, MaxPlaybackQuality: "1080p", AccessPolicyRevision: 4}},
		stubStoreProvider{store: stubStore{profile: &userstore.Profile{ID: "prof-1"}}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1, ProfileID: "prof-1"})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	if !scope.LibrariesRestricted || len(scope.AllowedLibraryIDs) != 2 || scope.AllowedLibraryIDs[0] != 1 || scope.AllowedLibraryIDs[1] != 3 {
		t.Fatalf("unexpected scope libraries: %+v", scope)
	}
	if scope.MaxPlaybackQuality != "1080p" {
		t.Fatalf("MaxPlaybackQuality = %q, want 1080p", scope.MaxPlaybackQuality)
	}
}

func TestResolver_IntersectsAccountAndProfileLibraries(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, LibraryIDs: []int{1, 2, 3}, AccessPolicyRevision: 4}},
		stubStoreProvider{store: stubStore{profile: &userstore.Profile{
			ID:                         "prof-1",
			LibraryRestrictionsEnabled: true,
			AllowedLibraryIDs:          []int{2, 4},
		}}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1, ProfileID: "prof-1"})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	if len(scope.AllowedLibraryIDs) != 1 || scope.AllowedLibraryIDs[0] != 2 {
		t.Fatalf("AllowedLibraryIDs = %v, want [2]", scope.AllowedLibraryIDs)
	}
}

func TestResolver_EmptyEffectiveLibraries(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, LibraryIDs: []int{1}, AccessPolicyRevision: 4}},
		stubStoreProvider{store: stubStore{profile: &userstore.Profile{
			ID:                         "prof-1",
			LibraryRestrictionsEnabled: true,
			AllowedLibraryIDs:          []int{2},
		}}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1, ProfileID: "prof-1"})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	if len(scope.AllowedLibraryIDs) != 0 || !scope.LibrariesRestricted {
		t.Fatalf("unexpected scope: %+v", scope)
	}
}

func TestResolver_DisabledLibraries_UnrestrictedUser(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, AccessPolicyRevision: 5}},
		stubStoreProvider{store: stubStore{
			profile:  &userstore.Profile{ID: "prof-1"},
			settings: map[string]string{"disabled_library_ids": "[3,5]"},
		}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1, ProfileID: "prof-1"})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	// Unrestricted user: AllowedLibraryIDs stays nil, DisabledLibraryIDs is populated.
	if scope.AllowedLibraryIDs != nil {
		t.Fatalf("AllowedLibraryIDs = %v, want nil", scope.AllowedLibraryIDs)
	}
	if len(scope.DisabledLibraryIDs) != 2 || scope.DisabledLibraryIDs[0] != 3 || scope.DisabledLibraryIDs[1] != 5 {
		t.Fatalf("DisabledLibraryIDs = %v, want [3 5]", scope.DisabledLibraryIDs)
	}
}

func TestResolver_DisabledLibraries_RestrictedUser(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, LibraryIDs: []int{1, 2, 3, 4}, AccessPolicyRevision: 5}},
		stubStoreProvider{store: stubStore{
			profile:  &userstore.Profile{ID: "prof-1"},
			settings: map[string]string{"disabled_library_ids": "[2,4]"},
		}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1, ProfileID: "prof-1"})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	// Restricted user: disabled IDs subtracted from AllowedLibraryIDs.
	if len(scope.AllowedLibraryIDs) != 2 || scope.AllowedLibraryIDs[0] != 1 || scope.AllowedLibraryIDs[1] != 3 {
		t.Fatalf("AllowedLibraryIDs = %v, want [1 3]", scope.AllowedLibraryIDs)
	}
	if len(scope.DisabledLibraryIDs) != 0 {
		t.Fatalf("DisabledLibraryIDs = %v, want empty", scope.DisabledLibraryIDs)
	}
}

func TestResolver_DisabledLibraries_NoProfile(t *testing.T) {
	resolver := NewResolver(
		stubUserRepo{user: &models.User{ID: 1, AccessPolicyRevision: 5}},
		stubStoreProvider{store: stubStore{
			settings: map[string]string{"disabled_library_ids": "[7]"},
		}},
		nil,
	)

	scope, err := resolver.Resolve(context.Background(), ResolveInput{UserID: 1})
	if err != nil {
		t.Fatalf("Resolve() error: %v", err)
	}
	if scope.AllowedLibraryIDs != nil {
		t.Fatalf("AllowedLibraryIDs = %v, want nil", scope.AllowedLibraryIDs)
	}
	if len(scope.DisabledLibraryIDs) != 1 || scope.DisabledLibraryIDs[0] != 7 {
		t.Fatalf("DisabledLibraryIDs = %v, want [7]", scope.DisabledLibraryIDs)
	}
}