//go:build unit

package service

import (
	"context"
	"errors"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/Wei-Shaw/sub2api/internal/config"
	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/require"
)

type authRepoStub struct {
	getByKeyForAuth   func(ctx context.Context, key string) (*APIKey, error)
	listKeysByUserID  func(ctx context.Context, userID int64) ([]string, error)
	listKeysByGroupID func(ctx context.Context, groupID int64) ([]string, error)
}

func (s *authRepoStub) Create(ctx context.Context, key *APIKey) error {
	panic("unexpected Create call")
}

func (s *authRepoStub) GetByID(ctx context.Context, id int64) (*APIKey, error) {
	panic("unexpected GetByID call")
}

func (s *authRepoStub) GetKeyAndOwnerID(ctx context.Context, id int64) (string, int64, error) {
	panic("unexpected GetKeyAndOwnerID call")
}

func (s *authRepoStub) GetByKey(ctx context.Context, key string) (*APIKey, error) {
	panic("unexpected GetByKey call")
}

func (s *authRepoStub) GetByKeyForAuth(ctx context.Context, key string) (*APIKey, error) {
	if s.getByKeyForAuth == nil {
		panic("unexpected GetByKeyForAuth call")
	}
	return s.getByKeyForAuth(ctx, key)
}

func (s *authRepoStub) Update(ctx context.Context, key *APIKey) error {
	panic("unexpected Update call")
}

func (s *authRepoStub) Delete(ctx context.Context, id int64) error {
	panic("unexpected Delete call")
}

func (s *authRepoStub) ListByUserID(ctx context.Context, userID int64, params pagination.PaginationParams) ([]APIKey, *pagination.PaginationResult, error) {
	panic("unexpected ListByUserID call")
}

func (s *authRepoStub) VerifyOwnership(ctx context.Context, userID int64, apiKeyIDs []int64) ([]int64, error) {
	panic("unexpected VerifyOwnership call")
}

func (s *authRepoStub) CountByUserID(ctx context.Context, userID int64) (int64, error) {
	panic("unexpected CountByUserID call")
}

func (s *authRepoStub) ExistsByKey(ctx context.Context, key string) (bool, error) {
	panic("unexpected ExistsByKey call")
}

func (s *authRepoStub) ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]APIKey, *pagination.PaginationResult, error) {
	panic("unexpected ListByGroupID call")
}

func (s *authRepoStub) SearchAPIKeys(ctx context.Context, userID int64, keyword string, limit int) ([]APIKey, error) {
	panic("unexpected SearchAPIKeys call")
}

func (s *authRepoStub) ClearGroupIDByGroupID(ctx context.Context, groupID int64) (int64, error) {
	panic("unexpected ClearGroupIDByGroupID call")
}

func (s *authRepoStub) CountByGroupID(ctx context.Context, groupID int64) (int64, error) {
	panic("unexpected CountByGroupID call")
}

func (s *authRepoStub) ListKeysByUserID(ctx context.Context, userID int64) ([]string, error) {
	if s.listKeysByUserID == nil {
		panic("unexpected ListKeysByUserID call")
	}
	return s.listKeysByUserID(ctx, userID)
}

func (s *authRepoStub) ListKeysByGroupID(ctx context.Context, groupID int64) ([]string, error) {
	if s.listKeysByGroupID == nil {
		panic("unexpected ListKeysByGroupID call")
	}
	return s.listKeysByGroupID(ctx, groupID)
}

type authCacheStub struct {
	getAuthCache   func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error)
	setAuthKeys    []string
	deleteAuthKeys []string
}

func (s *authCacheStub) GetCreateAttemptCount(ctx context.Context, userID int64) (int, error) {
	return 0, nil
}

func (s *authCacheStub) IncrementCreateAttemptCount(ctx context.Context, userID int64) error {
	return nil
}

func (s *authCacheStub) DeleteCreateAttemptCount(ctx context.Context, userID int64) error {
	return nil
}

func (s *authCacheStub) IncrementDailyUsage(ctx context.Context, apiKey string) error {
	return nil
}

func (s *authCacheStub) SetDailyUsageExpiry(ctx context.Context, apiKey string, ttl time.Duration) error {
	return nil
}

func (s *authCacheStub) GetAuthCache(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
	if s.getAuthCache == nil {
		return nil, redis.Nil
	}
	return s.getAuthCache(ctx, key)
}

func (s *authCacheStub) SetAuthCache(ctx context.Context, key string, entry *APIKeyAuthCacheEntry, ttl time.Duration) error {
	s.setAuthKeys = append(s.setAuthKeys, key)
	return nil
}

func (s *authCacheStub) DeleteAuthCache(ctx context.Context, key string) error {
	s.deleteAuthKeys = append(s.deleteAuthKeys, key)
	return nil
}

func (s *authCacheStub) PublishAuthCacheInvalidation(ctx context.Context, cacheKey string) error {
	return nil
}

func (s *authCacheStub) SubscribeAuthCacheInvalidation(ctx context.Context, handler func(cacheKey string)) error {
	return nil
}

func TestAPIKeyService_GetByKey_UsesL2Cache(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			return nil, errors.New("unexpected repo call")
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds:       60,
			NegativeTTLSeconds: 30,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)

	groupID := int64(9)
	cacheEntry := &APIKeyAuthCacheEntry{
		Snapshot: &APIKeyAuthSnapshot{
			APIKeyID: 1,
			UserID:   2,
			GroupID:  &groupID,
			Status:   StatusActive,
			User: APIKeyAuthUserSnapshot{
				ID:          2,
				Status:      StatusActive,
				Role:        RoleUser,
				Balance:     10,
				Concurrency: 3,
			},
			Group: &APIKeyAuthGroupSnapshot{
				ID:                  groupID,
				Name:                "g",
				Platform:            PlatformAnthropic,
				Status:              StatusActive,
				SubscriptionType:    SubscriptionTypeStandard,
				RateMultiplier:      1,
				ModelRoutingEnabled: true,
				ModelRouting: map[string][]int64{
					"claude-opus-*": {1, 2},
				},
			},
		},
	}
	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
		return cacheEntry, nil
	}

	apiKey, err := svc.GetByKey(context.Background(), "k1")
	require.NoError(t, err)
	require.Equal(t, int64(1), apiKey.ID)
	require.Equal(t, int64(2), apiKey.User.ID)
	require.Equal(t, groupID, apiKey.Group.ID)
	require.True(t, apiKey.Group.ModelRoutingEnabled)
	require.Equal(t, map[string][]int64{"claude-opus-*": {1, 2}}, apiKey.Group.ModelRouting)
}

func TestAPIKeyService_GetByKey_NegativeCache(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			return nil, errors.New("unexpected repo call")
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds:       60,
			NegativeTTLSeconds: 30,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
		return &APIKeyAuthCacheEntry{NotFound: true}, nil
	}

	_, err := svc.GetByKey(context.Background(), "missing")
	require.ErrorIs(t, err, ErrAPIKeyNotFound)
}

func TestAPIKeyService_GetByKey_CacheMissStoresL2(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			return &APIKey{
				ID:     5,
				UserID: 7,
				Status: StatusActive,
				User: &User{
					ID:          7,
					Status:      StatusActive,
					Role:        RoleUser,
					Balance:     12,
					Concurrency: 2,
				},
			}, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds:       60,
			NegativeTTLSeconds: 30,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
		return nil, redis.Nil
	}

	apiKey, err := svc.GetByKey(context.Background(), "k2")
	require.NoError(t, err)
	require.Equal(t, int64(5), apiKey.ID)
	require.Len(t, cache.setAuthKeys, 1)
}

func TestAPIKeyService_GetByKey_UsesL1Cache(t *testing.T) {
	var calls int32
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			atomic.AddInt32(&calls, 1)
			return &APIKey{
				ID:     21,
				UserID: 3,
				Status: StatusActive,
				User: &User{
					ID:          3,
					Status:      StatusActive,
					Role:        RoleUser,
					Balance:     5,
					Concurrency: 2,
				},
			}, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L1Size:       1000,
			L1TTLSeconds: 60,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
	require.NotNil(t, svc.authCacheL1)

	_, err := svc.GetByKey(context.Background(), "k-l1")
	require.NoError(t, err)
	svc.authCacheL1.Wait()
	cacheKey := svc.authCacheKey("k-l1")
	_, ok := svc.authCacheL1.Get(cacheKey)
	require.True(t, ok)
	_, err = svc.GetByKey(context.Background(), "k-l1")
	require.NoError(t, err)
	require.Equal(t, int32(1), atomic.LoadInt32(&calls))
}

func TestAPIKeyService_InvalidateAuthCacheByUserID(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		listKeysByUserID: func(ctx context.Context, userID int64) ([]string, error) {
			return []string{"k1", "k2"}, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds:       60,
			NegativeTTLSeconds: 30,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)

	svc.InvalidateAuthCacheByUserID(context.Background(), 7)
	require.Len(t, cache.deleteAuthKeys, 2)
}

func TestAPIKeyService_InvalidateAuthCacheByGroupID(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		listKeysByGroupID: func(ctx context.Context, groupID int64) ([]string, error) {
			return []string{"k1", "k2"}, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds: 60,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)

	svc.InvalidateAuthCacheByGroupID(context.Background(), 9)
	require.Len(t, cache.deleteAuthKeys, 2)
}

func TestAPIKeyService_InvalidateAuthCacheByKey(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		listKeysByUserID: func(ctx context.Context, userID int64) ([]string, error) {
			return nil, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds: 60,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)

	svc.InvalidateAuthCacheByKey(context.Background(), "k1")
	require.Len(t, cache.deleteAuthKeys, 1)
}

func TestAPIKeyService_GetByKey_CachesNegativeOnRepoMiss(t *testing.T) {
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			return nil, ErrAPIKeyNotFound
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			L2TTLSeconds:       60,
			NegativeTTLSeconds: 30,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
		return nil, redis.Nil
	}

	_, err := svc.GetByKey(context.Background(), "missing")
	require.ErrorIs(t, err, ErrAPIKeyNotFound)
	require.Len(t, cache.setAuthKeys, 1)
}

func TestAPIKeyService_GetByKey_SingleflightCollapses(t *testing.T) {
	var calls int32
	cache := &authCacheStub{}
	repo := &authRepoStub{
		getByKeyForAuth: func(ctx context.Context, key string) (*APIKey, error) {
			atomic.AddInt32(&calls, 1)
			time.Sleep(50 * time.Millisecond)
			return &APIKey{
				ID:     11,
				UserID: 2,
				Status: StatusActive,
				User: &User{
					ID:          2,
					Status:      StatusActive,
					Role:        RoleUser,
					Balance:     1,
					Concurrency: 1,
				},
			}, nil
		},
	}
	cfg := &config.Config{
		APIKeyAuth: config.APIKeyAuthCacheConfig{
			Singleflight: true,
		},
	}
	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)

	start := make(chan struct{})
	wg := sync.WaitGroup{}
	errs := make([]error, 5)
	for i := 0; i < 5; i++ {
		wg.Add(1)
		go func(idx int) {
			defer wg.Done()
			<-start
			_, err := svc.GetByKey(context.Background(), "k1")
			errs[idx] = err
		}(i)
	}
	close(start)
	wg.Wait()

	for _, err := range errs {
		require.NoError(t, err)
	}
	require.Equal(t, int32(1), atomic.LoadInt32(&calls))
}