package model

import (
	"encoding/json"
	"gorm.io/gorm"
)

// UserRelations 好友关系表
type UserRelations struct {
	gorm.Model
	UserID      string          `gorm:"column:user_id;type:varchar(32);not null;index:idx_user_friend,unique;comment:用户id"`
	FriendList  json.RawMessage `gorm:"column:friend_list;type:json;comment:'好友列表'"`
	FriendCount int64           `gorm:"column:friend_count;type:int;default:0;comment:好友数量"`
}

type Friend struct {
	FriendID   string `json:"friend_id"`
	Remark     string `json:"remark"`      // 好友备注
	CreateTime int64  `json:"create_time"` // 创建时间
}

func (u *UserRelations) TableName() string {
	return "user_relations"
}

// FriendApplicationStatus 好友申请状态
type FriendApplicationStatus int

const (
	ApplicationPending    FriendApplicationStatus = iota // 0-待处理
	ApplicationAccepted                                  // 1-已接受
	ApplicationRejected                                  //已拒绝
	RelationshipBreakdown                                //删除
)

// FriendApplication 好友申请表
type FriendRelationship struct {
	gorm.Model
	ApplicantID        string                  `gorm:"column:applicant_id;type:varchar(32);not null;index:idx_applicant_target,unique;comment:申请人ID"`    // 发起申请者ID
	TargetUserID       string                  `gorm:"column:target_user_id;type:varchar(32);not null;index:idx_applicant_target,unique;comment:目标用户ID"` // 被申请用户ID
	ApplicationMessage string                  `gorm:"column:application_message;type:varchar(255);comment:申请留言"`                                        // 申请留言
	Status             FriendApplicationStatus `gorm:"column:status;type:int;not null;default:0;comment:申请状态(0-待处理,1-已接受,2-已拒绝.3-关系破裂)"`                 // 申请状态
}

// TableName 指定表名
func (f *FriendRelationship) TableName() string {
	return "friend_relationship"
}

// IsValid 检查状态是否有效
func (s FriendApplicationStatus) IsValid() bool {
	return s >= ApplicationPending && s <= RelationshipBreakdown
}