package logic

import (
	"context"
	"time"

	conventity "spark-server/internal/module/conversation/entity"
	deliverentity "spark-server/internal/module/deliver/entity"
	"spark-server/internal/module/message/entity"
)

const (
	defaultHistoryLimit = 200
	recallWindow        = 2 * time.Minute
	msgIDSkew           = 5 * time.Minute
)

type Repository interface {
	Create(ctx context.Context, message *entity.Message) error
	CreateAndBump(ctx context.Context, message *entity.Message) error
	GetByID(ctx context.Context, id int64) (*entity.Message, error)
	GetByClientMsgID(ctx context.Context, senderID, conversationID int64, clientMsgID string) (*entity.Message, error)
	ListByConversation(ctx context.Context, conversationID, viewerID, lastMsgID int64, limit int) ([]*entity.Message, error)
	Recall(ctx context.Context, id int64) error
	HideForUser(ctx context.Context, userID int64, msg *entity.Message) error
	PurgeUser(ctx context.Context, userID int64) error
}

type Conversations interface {
	Get(ctx context.Context, id int64) (*conventity.Conversation, error)
	GetMember(ctx context.Context, conversationID, userID int64) (*conventity.Member, error)
	ListMemberIDs(ctx context.Context, conversationID int64) ([]int64, error)
}

type P2POpener interface {
	EnsureP2P(ctx context.Context, userA, userB int64) (int64, error)
}

type FriendGate interface {
	CanSend(ctx context.Context, fromUserID, toUserID int64) error
}

type GroupGate interface {
	CanSend(ctx context.Context, userID, conversationID int64) error
	MemberIDs(ctx context.Context, conversationID int64) ([]int64, error)
	CheckMentions(ctx context.Context, userID, conversationID int64, atAll bool, uids []int64) error
	IDByConversation(ctx context.Context, conversationID int64) (int64, error)
}

type IDGen interface {
	NextID() (int64, error)
}

type DeliverQueue interface {
	Push(ctx context.Context, job *deliverentity.Job) error
}

// Service is send / recall / delete / history. HTTP and TCP share it.
type Service struct {
	repo    Repository
	chats   Conversations
	p2p     P2POpener
	friends FriendGate
	groups  GroupGate
	ids     IDGen
	queue   DeliverQueue
}

func NewService(repo Repository, chats Conversations, p2p P2POpener, friends FriendGate, groups GroupGate, ids IDGen, queue DeliverQueue) *Service {
	return &Service{repo: repo, chats: chats, p2p: p2p, friends: friends, groups: groups, ids: ids, queue: queue}
}

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