package social

import (
	"time"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

// Group represents a social group that users can create and join
type Group struct {
	ID          uuid.UUID      `gorm:"type:uuid;primaryKey;default:gen_random_uuid()" json:"id"`
	Name        string         `gorm:"not null;size:255" json:"name"`
	Description string         `gorm:"type:text" json:"description"`
	CreatorID   uuid.UUID      `gorm:"type:uuid;not null;index" json:"creator_id"`
	AvatarURL   string         `gorm:"size:500" json:"avatar_url,omitempty"`
	IsPublic    bool           `gorm:"default:true" json:"is_public"`
	MemberCount int            `gorm:"default:1" json:"member_count"`
	CreatedAt   time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt   time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`
}

func (g *Group) BeforeCreate(tx *gorm.DB) (err error) {
	if g.ID == uuid.Nil {
		g.ID = uuid.New()
	}
	return
}

// GroupMember represents a user's membership in a group
type GroupMember struct {
	ID       uuid.UUID `gorm:"type:uuid;primaryKey;default:gen_random_uuid()" json:"id"`
	GroupID  uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_member" json:"group_id"`
	UserID   uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_member" json:"user_id"`
	Role     string    `gorm:"default:'member';size:50" json:"role"` // "admin", "moderator", "member"
	JoinedAt time.Time `gorm:"autoCreateTime" json:"joined_at"`
}

func (gm *GroupMember) BeforeCreate(tx *gorm.DB) (err error) {
	if gm.ID == uuid.Nil {
		gm.ID = uuid.New()
	}
	return
}

// GroupJoinRequest represents a user's request to join a private group (v0.302 S2.1)
type GroupJoinRequest struct {
	ID        uuid.UUID `gorm:"type:uuid;primaryKey;default:gen_random_uuid()" json:"id"`
	GroupID   uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_join_request" json:"group_id"`
	UserID    uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_join_request" json:"user_id"`
	Status    string    `gorm:"default:'pending';size:20" json:"status"` // pending, approved, rejected
	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
}

func (gjr *GroupJoinRequest) BeforeCreate(tx *gorm.DB) (err error) {
	if gjr.ID == uuid.Nil {
		gjr.ID = uuid.New()
	}
	return
}

// TableName overrides the table name for GroupJoinRequest
func (GroupJoinRequest) TableName() string {
	return "group_join_requests"
}

// GroupInvitation represents an invitation to join a group (v0.302 S2.2)
type GroupInvitation struct {
	ID        uuid.UUID `gorm:"type:uuid;primaryKey;default:gen_random_uuid()" json:"id"`
	GroupID   uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_invitation" json:"group_id"`
	InviterID uuid.UUID `gorm:"type:uuid;not null" json:"inviter_id"`
	InviteeID uuid.UUID `gorm:"type:uuid;not null;uniqueIndex:idx_group_invitation" json:"invitee_id"`
	Status    string    `gorm:"default:'pending';size:20" json:"status"` // pending, accepted, declined
	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
}

func (gi *GroupInvitation) BeforeCreate(tx *gorm.DB) (err error) {
	if gi.ID == uuid.Nil {
		gi.ID = uuid.New()
	}
	return
}

// TableName overrides the table name for GroupInvitation
func (GroupInvitation) TableName() string {
	return "group_invitations"
}