package entities

import (
	"time"

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

// LoyaltySettingChange records one change to a loyalty setting: which key, from what,
// to what, by whom (docs/prd-point-coin.md F2). Append-only.
type LoyaltySettingChange struct {
	ID             uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
	OrganizationID uuid.UUID `gorm:"type:uuid;not null" json:"organization_id"`
	// Nil for an organization setting.
	OutletID *uuid.UUID `gorm:"type:uuid" json:"outlet_id"`
	Key      string     `gorm:"not null;size:100" json:"key"`
	// Nil when the key had no stored value, or has none any more.
	OldValue  *string   `gorm:"type:text" json:"old_value"`
	NewValue  *string   `gorm:"type:text" json:"new_value"`
	ChangedBy uuid.UUID `gorm:"type:uuid;not null" json:"changed_by"`
	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
}

func (c *LoyaltySettingChange) BeforeCreate(tx *gorm.DB) error {
	if c.ID == uuid.Nil {
		c.ID = uuid.New()
	}
	return nil
}

func (LoyaltySettingChange) TableName() string {
	return "loyalty_setting_changes"
}