package domain

import (
	"context"
	"errors"
	"time"
)

const (
	KindJob    = "job"
	KindSystem = "system"
	RefJob     = "job"
	RefNone    = "none"
)

var (
	ErrNotFound  = errors.New("notification not found")
	ErrForbidden = errors.New("notification access denied")
)

type Notification struct {
	ID        string `bson:"_id" json:"id"`
	OwnerUID  int64  `bson:"owner_uid" json:"owner_uid"`
	Title     string `bson:"title" json:"title"`
	Body      string `bson:"body" json:"body"`
	Kind      string `bson:"kind" json:"kind"`
	RefType   string `bson:"ref_type" json:"ref_type"`
	RefID     string `bson:"ref_id,omitempty" json:"ref_id,omitempty"`
	ReadAt    int64  `bson:"read_at,omitempty" json:"read_at,omitempty"`
	CreatedAt int64  `bson:"created_at" json:"created_at"`
}

func NowNano() int64 { return time.Now().UTC().UnixNano() }

type Repository interface {
	Insert(ctx context.Context, n *Notification) error
	ListByOwner(ctx context.Context, ownerUID int64) ([]*Notification, error)
	UnreadCount(ctx context.Context, ownerUID int64) (int64, error)
	MarkRead(ctx context.Context, ownerUID int64, id string) error
	MarkAllRead(ctx context.Context, ownerUID int64) error
	FindByID(ctx context.Context, id string) (*Notification, error)
	// FindLatestByJobRef — 同一 job 的最新通知（用於進度 upsert）
	FindLatestByJobRef(ctx context.Context, ownerUID int64, jobID string) (*Notification, error)
	// Replace full document
	Replace(ctx context.Context, n *Notification) error
}