package logic

import (
	"context"

	friendentity "spark-server/internal/module/friend/entity"
	"spark-server/internal/module/moment/entity"
	userentity "spark-server/internal/module/user/entity"
	"spark-server/internal/pkg/media"

	"go.uber.org/zap"
)

// Repository persists Moments. Model implements it.
type Repository interface {
	CreatePost(ctx context.Context, post *entity.Post, audience []int64) error
	GetPost(ctx context.Context, id int64) (*entity.Post, error)
	ListByAuthors(ctx context.Context, authorIDs []int64, cursor int64, limit int) ([]*entity.Post, error)
	ListByAuthor(ctx context.Context, authorID, cursor int64, limit int) ([]*entity.Post, error)
	SoftDeletePost(ctx context.Context, userID, postID int64) (*entity.Post, error)
	ListAudience(ctx context.Context, postIDs []int64) (map[int64][]int64, error)
	ListLikes(ctx context.Context, postIDs []int64) (map[int64][]*entity.Like, error)
	AddLike(ctx context.Context, like *entity.Like) (created bool, err error)
	RemoveLike(ctx context.Context, postID, userID int64) error
	ListComments(ctx context.Context, postIDs []int64) (map[int64][]*entity.Comment, error)
	GetComment(ctx context.Context, id int64) (*entity.Comment, error)
	AddComment(ctx context.Context, c *entity.Comment) error
	SoftDeleteComment(ctx context.Context, id int64) error
	CreateNotices(ctx context.Context, rows []*entity.Notice) error
	ListNotices(ctx context.Context, userID, cursor int64, limit int) ([]*entity.Notice, error)
	MarkNoticesRead(ctx context.Context, userID, cursor int64) error
	GetSettings(ctx context.Context, userID int64) (*entity.Settings, error)
	ListSettings(ctx context.Context, userIDs []int64) (map[int64]*entity.Settings, error)
	UpsertSettings(ctx context.Context, s *entity.Settings) error
	AdvanceRead(ctx context.Context, userID, postID int64) error
	ListHides(ctx context.Context, userID int64) ([]*entity.Hide, error)
	HideHimIDs(ctx context.Context, userID int64) ([]int64, error)
	HideMeFromIDs(ctx context.Context, viewerID int64) ([]int64, error)
	UpsertHide(ctx context.Context, h *entity.Hide) error
	DeleteHide(ctx context.Context, userID, peerID int64) error
	ListAllByAuthor(ctx context.Context, authorID int64) ([]*entity.Post, error)
	PurgeUser(ctx context.Context, userID int64) error
}

// Friends is the friend graph used for visibility. Friend module implements it.
type Friends interface {
	AreFriends(ctx context.Context, a, b int64) (bool, error)
	ListFriendIDs(ctx context.Context, userID int64) ([]int64, error)
	ListBlockedPeerIDs(ctx context.Context, userID int64) ([]int64, error)
	Relation(ctx context.Context, userID, peerID int64) (*friendentity.Relation, error)
	BlockedEither(ctx context.Context, a, b int64) (bool, error)
}

// Users loads profile cards.
type Users interface {
	Get(ctx context.Context, id int64) (*userentity.User, error)
}

// Objects deletes Moments media. Nil skips GC.
type Objects interface {
	Delete(ctx context.Context, key string) error
}

// IDGen issues Snowflake ids for posts, comments, and notices.
type IDGen interface {
	NextID() (int64, error)
}

// Service is the Moments use-case layer (HTTP and TCP share it).
type Service struct {
	repo    Repository
	friends Friends
	users   Users
	objects Objects
	ids     IDGen
	burst   *burst
	media   media.Policy
	log     *zap.Logger
}

func NewService(repo Repository, friends Friends, users Users, objects Objects, ids IDGen) *Service {
	return &Service{repo: repo, friends: friends, users: users, objects: objects, ids: ids, burst: newBurst(), log: zap.NewNop()}
}

// ConfigureMedia sets user-path media detection (client compresses; server checks declared meta).
func (s *Service) ConfigureMedia(p media.Policy, log *zap.Logger) {
	if s == nil {
		return
	}
	s.media = p
	if log != nil {
		s.log = log
	}
}

func (s *Service) ready() bool {
	return s != nil && s.repo != nil && s.friends != nil && s.users != nil && s.ids != nil
}