backend/internal/model/trade.go

package model

import (
	"time"

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

type TradeType string

const (
	TradeTypeSell TradeType = "sell"
	TradeTypeBuy  TradeType = "buy"
)

type TradeCategory string

const (
	TradeCategoryDigital   TradeCategory = "digital"
	TradeCategoryBook      TradeCategory = "book"
	TradeCategoryClothing  TradeCategory = "clothing"
	TradeCategoryDaily     TradeCategory = "daily"
	TradeCategoryCosmetics TradeCategory = "cosmetics"
	TradeCategorySport     TradeCategory = "sport"
	TradeCategoryTicket    TradeCategory = "ticket"
	TradeCategoryOther     TradeCategory = "other"
)

type TradeItemStatus string

const (
	TradeItemActive  TradeItemStatus = "active"
	TradeItemSold    TradeItemStatus = "sold"
	TradeItemBought  TradeItemStatus = "bought"
	TradeItemOffline TradeItemStatus = "offline"
)

type TradeItem struct {
	ID             string          `json:"id" gorm:"type:varchar(36);primaryKey"`
	UserID         string          `json:"user_id" gorm:"type:varchar(36);index;not null"`
	TradeType      TradeType       `json:"trade_type" gorm:"type:varchar(10);not null;index"`
	Category       TradeCategory   `json:"category" gorm:"type:varchar(20);not null;index"`
	Title          string          `json:"title" gorm:"type:varchar(100);not null"`
	Content        string          `json:"content" gorm:"type:text"`
	Segments       MessageSegments `json:"segments,omitempty" gorm:"type:text"`
	User           *User           `json:"user,omitempty" gorm:"foreignKey:UserID"`
	Images         []TradeImage    `json:"images" gorm:"foreignKey:TradeItemID"`
	Price          *float64        `json:"price,omitempty" gorm:"type:decimal(10,2)"`
	Condition      string          `json:"condition,omitempty" gorm:"type:varchar(20)"`
	Status         TradeItemStatus `json:"status" gorm:"type:varchar(10);not null;default:'active';index"`
	ViewsCount     int             `json:"views_count" gorm:"default:0"`
	FavoritesCount int             `json:"favorites_count" gorm:"default:0"`
	DeletedAt      gorm.DeletedAt  `json:"-" gorm:"index"`
	CreatedAt      time.Time       `json:"created_at" gorm:"autoCreateTime;index"`
	UpdatedAt      time.Time       `json:"updated_at" gorm:"autoUpdateTime:false"`
}

func (t *TradeItem) BeforeCreate(tx *gorm.DB) error {
	if t.ID == "" {
		t.ID = uuid.New().String()
	}
	return nil
}

func (TradeItem) TableName() string {
	return "trade_items"
}

type TradeImage struct {
	ID              string    `json:"id" gorm:"type:varchar(36);primaryKey"`
	TradeItemID     string    `json:"trade_item_id" gorm:"type:varchar(36);not null;index"`
	URL             string    `json:"url" gorm:"type:text;not null"`
	ThumbnailURL    string    `json:"thumbnail_url" gorm:"type:text"`
	PreviewURL      string    `json:"preview_url" gorm:"type:text"`
	PreviewURLLarge string    `json:"preview_url_large" gorm:"type:text"`
	Width           int       `json:"width" gorm:"default:0"`
	Height          int       `json:"height" gorm:"default:0"`
	SortOrder       int       `json:"sort_order" gorm:"default:0"`
	CreatedAt       time.Time `json:"created_at" gorm:"autoCreateTime"`
}

func (ti *TradeImage) BeforeCreate(tx *gorm.DB) error {
	if ti.ID == "" {
		ti.ID = uuid.New().String()
	}
	return nil
}

func (TradeImage) TableName() string {
	return "trade_images"
}

type TradeFavorite struct {
	ID          string    `json:"id" gorm:"type:varchar(36);primaryKey"`
	TradeItemID string    `json:"trade_item_id" gorm:"type:varchar(36);not null;index;uniqueIndex:idx_trade_fav_item_user,priority:1"`
	UserID      string    `json:"user_id" gorm:"type:varchar(36);not null;index;uniqueIndex:idx_trade_fav_item_user,priority:2"`
	CreatedAt   time.Time `json:"created_at" gorm:"autoCreateTime"`
}

func (f *TradeFavorite) BeforeCreate(tx *gorm.DB) error {
	if f.ID == "" {
		f.ID = uuid.New().String()
	}
	return nil
}

func (TradeFavorite) TableName() string {
	return "trade_favorites"
}