package models

import (
	"time"

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

// QueueSession represents a shared collaborative queue (v0.203 Lot D1)
type QueueSession struct {
	ID         uuid.UUID `gorm:"type:uuid;primaryKey" json:"id"`
	ShareToken string    `gorm:"type:varchar(32);uniqueIndex;not null" json:"share_token"`
	CreatorID  uuid.UUID `gorm:"type:uuid;not null;index" json:"creator_id"`
	CreatedAt  time.Time `gorm:"autoCreateTime" json:"created_at"`

	Creator User              `gorm:"foreignKey:CreatorID" json:"-"`
	Items   []SharedQueueItem `gorm:"foreignKey:SessionID;constraint:OnDelete:CASCADE" json:"items,omitempty"`
}

// TableName defines the table name for GORM
func (QueueSession) TableName() string {
	return "queue_sessions"
}

// BeforeCreate GORM hook to generate UUID if not set
func (qs *QueueSession) BeforeCreate(tx *gorm.DB) error {
	if qs.ID == uuid.Nil {
		qs.ID = uuid.New()
	}
	return nil
}

// SharedQueueItem represents a track in a shared queue session
type SharedQueueItem struct {
	ID        uuid.UUID `gorm:"type:uuid;primaryKey" json:"id"`
	SessionID uuid.UUID `gorm:"type:uuid;not null;index" json:"session_id"`
	TrackID   uuid.UUID `gorm:"type:uuid;not null" json:"track_id"`
	Position  int       `gorm:"not null" json:"position"`
	AddedAt   time.Time `gorm:"autoCreateTime" json:"added_at"`

	Track Track `gorm:"foreignKey:TrackID" json:"track,omitempty"`
}

// TableName defines the table name for GORM
func (SharedQueueItem) TableName() string {
	return "shared_queue_items"
}

// BeforeCreate GORM hook to generate UUID if not set
func (qi *SharedQueueItem) BeforeCreate(tx *gorm.DB) error {
	if qi.ID == uuid.Nil {
		qi.ID = uuid.New()
	}
	return nil
}