//go:build unit

package service

import (
	"context"
	"testing"

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

// stubGroupRepoForAvailable 是 ListAvailable 测试用的 GroupRepository stub，
// 仅实现 ListActive；其他方法对本测试无关，返回零值即可。
type stubGroupRepoForAvailable struct {
	activeGroups []Group
}

func (s *stubGroupRepoForAvailable) ListActive(ctx context.Context) ([]Group, error) {
	return s.activeGroups, nil
}

func (s *stubGroupRepoForAvailable) Create(ctx context.Context, group *Group) error { return nil }
func (s *stubGroupRepoForAvailable) GetByID(ctx context.Context, id int64) (*Group, error) {
	return nil, nil
}
func (s *stubGroupRepoForAvailable) GetByIDLite(ctx context.Context, id int64) (*Group, error) {
	return nil, nil
}
func (s *stubGroupRepoForAvailable) Update(ctx context.Context, group *Group) error { return nil }
func (s *stubGroupRepoForAvailable) Delete(ctx context.Context, id int64) error     { return nil }
func (s *stubGroupRepoForAvailable) DeleteCascade(ctx context.Context, id int64) ([]int64, error) {
	return nil, nil
}
func (s *stubGroupRepoForAvailable) List(ctx context.Context, params pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error) {
	return nil, nil, nil
}
func (s *stubGroupRepoForAvailable) ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, status, search string, isExclusive *bool) ([]Group, *pagination.PaginationResult, error) {
	return nil, nil, nil
}
func (s *stubGroupRepoForAvailable) ListActiveByPlatform(ctx context.Context, platform string) ([]Group, error) {
	return nil, nil
}
func (s *stubGroupRepoForAvailable) ExistsByName(ctx context.Context, name string) (bool, error) {
	return false, nil
}
func (s *stubGroupRepoForAvailable) GetAccountCount(ctx context.Context, groupID int64) (int64, int64, error) {
	return 0, 0, nil
}
func (s *stubGroupRepoForAvailable) DeleteAccountGroupsByGroupID(ctx context.Context, groupID int64) (int64, error) {
	return 0, nil
}
func (s *stubGroupRepoForAvailable) GetAccountIDsByGroupIDs(ctx context.Context, groupIDs []int64) ([]int64, error) {
	return nil, nil
}
func (s *stubGroupRepoForAvailable) BindAccountsToGroup(ctx context.Context, groupID int64, accountIDs []int64) error {
	return nil
}
func (s *stubGroupRepoForAvailable) UpdateSortOrders(ctx context.Context, updates []GroupSortOrderUpdate) error {
	return nil
}

// newAvailableChannelService 构造一个 ChannelService，channelRepo.ListAll 返回给定 channels，
// groupRepo 由参数决定（可传 nil 测试 nil 分支）。
func newAvailableChannelService(channels []Channel, groupRepo GroupRepository) *ChannelService {
	repo := &mockChannelRepository{
		listAllFn: func(ctx context.Context) ([]Channel, error) { return channels, nil },
	}
	return NewChannelService(repo, groupRepo, nil)
}

func TestListAvailable_NilGroupRepo_NoGroupsAttached(t *testing.T) {
	// groupRepo 为 nil 时不应 panic，且每个渠道的 Groups 应为空切片。
	channels := []Channel{{
		ID:       1,
		Name:     "chA",
		Status:   StatusActive,
		GroupIDs: []int64{10, 20},
	}}
	svc := newAvailableChannelService(channels, nil)
	out, err := svc.ListAvailable(context.Background())
	require.NoError(t, err)
	require.Len(t, out, 1)
	require.Empty(t, out[0].Groups)
}

func TestListAvailable_InactiveGroupIDSilentlyDropped(t *testing.T) {
	// 渠道 GroupIDs 中引用的 group 未出现在 ListActive 结果中（已停用或删除），应被静默丢弃。
	channels := []Channel{{
		ID:       1,
		Name:     "chA",
		Status:   StatusActive,
		GroupIDs: []int64{1, 99},
	}}
	groupRepo := &stubGroupRepoForAvailable{
		activeGroups: []Group{{ID: 1, Name: "g1", Platform: "anthropic"}},
	}
	svc := newAvailableChannelService(channels, groupRepo)
	out, err := svc.ListAvailable(context.Background())
	require.NoError(t, err)
	require.Len(t, out, 1)
	require.Len(t, out[0].Groups, 1)
	require.Equal(t, int64(1), out[0].Groups[0].ID)
}

func TestListAvailable_SortedByName(t *testing.T) {
	channels := []Channel{
		{ID: 1, Name: "beta"},
		{ID: 2, Name: "Alpha"},
		{ID: 3, Name: "charlie"},
	}
	svc := newAvailableChannelService(channels, nil)
	out, err := svc.ListAvailable(context.Background())
	require.NoError(t, err)
	require.Len(t, out, 3)
	require.Equal(t, "Alpha", out[0].Name)
	require.Equal(t, "beta", out[1].Name)
	require.Equal(t, "charlie", out[2].Name)
}