package entities

import (
	"fmt"
	"strings"

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

type MUomEntity struct {
	ID           uuid.UUID `gorm:"type:uuid;primary_key;default:uuid_generate_v4()" json:"id"`
	Name         string    `gorm:"type:varchar(100);not null;" json:"name"`
	Description  string    `gorm:"type:text" json:"description"`
	Symbol       string    `gorm:"type:varchar(20);" json:"symbol"`
	Code         string    `gorm:"type:varchar(50);" json:"code"`
	StdPrecision int       `gorm:"type:int;" json:"std_precision"`
	IsActive     bool      `gorm:"type:boolean;default:true" json:"is_active"`

	ClientID uuid.UUID `gorm:"type:uuid;index;" json:"client_id"`

	Client           M_Client         `gorm:"foreignKey:ClientID;references:ID" json:"client"`
	Products         []MProductEntity `gorm:"foreignKey:UomID;references:ID"`
	DimProducts      []MProductEntity `gorm:"foreignKey:DimUomID;references:ID"`
	WeightProducts   []MProductEntity `gorm:"foreignKey:WeightUomID;references:ID"`
	VolumeProducts   []MProductEntity `gorm:"foreignKey:VolumeUomID;references:ID"`
	MinStockProducts []MProductEntity `gorm:"foreignKey:MinStockUomID;references:ID"`
	MaxStockProducts []MProductEntity `gorm:"foreignKey:MaxStockUomID;references:ID"`
	LeadTimeProducts []MProductEntity `gorm:"foreignKey:LeadTimeUomID;references:ID"`
	UomToUomProducts []MProductEntity `gorm:"foreignKey:UomToUomID;references:ID"`

	FullAuditTrail
}

func (MUomEntity) TableName() string {
	return "m_uoms"
}

// GenerateCodeUom generates a new UOM code with sequence per client
func GenerateCodeUom(db *gorm.DB, clientId string) (string, error) {
	prefix := "UOM"

	var lastUom MUomEntity
	err := db.
		Where("client_id = ?", clientId).
		Where("code LIKE ?", prefix+"-%").
		Order("code DESC").
		First(&lastUom).Error

	seq := 1
	if err == nil && lastUom.Code != "" {
		parts := strings.Split(lastUom.Code, "-")
		if len(parts) == 2 {
			fmt.Sscanf(parts[1], "%d", &seq)
			seq++
		}
	}

	code := fmt.Sprintf("%s-%04d", prefix, seq)
	return code, nil
}