// Package pricing implements quantity-based pricing for products (spec
// section 16): a product can have several price tiers, each pairing a
// quantity with a unit (from the units module) and a price. Pricing logic
// (computing an order line's total from a chosen tier) is centralized here
// in the backend -- the frontend only ever displays tiers and sends back a
// tier ID + multiplier; it never sends a price the backend has to trust.
package pricing

import (
	"time"

	"github.com/google/uuid"
)

type PriceTier struct {
	ID         uuid.UUID `gorm:"type:uuid;primaryKey"`
	ProductID  uuid.UUID `gorm:"type:uuid;not null;index"`
	UnitID     uuid.UUID `gorm:"type:uuid;not null"`
	Quantity   float64   `gorm:"not null"`
	PriceCents int64     `gorm:"not null"`
	Position   int       `gorm:"not null;default:0"`
	CreatedAt  time.Time
	UpdatedAt  time.Time
}

func (PriceTier) TableName() string { return "price_tiers" }