saveinmed/backend/internal/domain/models.go

package domain

import (
	"time"

	"github.com/gofrs/uuid/v5"
)

// Company represents a B2B actor in the marketplace.
type Company struct {
	ID            uuid.UUID `db:"id" json:"id"`
	Role          string    `db:"role" json:"role"` // pharmacy, distributor, admin
	CNPJ          string    `db:"cnpj" json:"cnpj"`
	CorporateName string    `db:"corporate_name" json:"corporate_name"`
	LicenseNumber string    `db:"license_number" json:"license_number"`
	IsVerified    bool      `db:"is_verified" json:"is_verified"`
	CreatedAt     time.Time `db:"created_at" json:"created_at"`
	UpdatedAt     time.Time `db:"updated_at" json:"updated_at"`
}

// User represents an authenticated actor inside a company.
type User struct {
	ID           uuid.UUID `db:"id" json:"id"`
	CompanyID    uuid.UUID `db:"company_id" json:"company_id"`
	Role         string    `db:"role" json:"role"`
	Name         string    `db:"name" json:"name"`
	Email        string    `db:"email" json:"email"`
	PasswordHash string    `db:"password_hash" json:"-"`
	CreatedAt    time.Time `db:"created_at" json:"created_at"`
	UpdatedAt    time.Time `db:"updated_at" json:"updated_at"`
}

// UserFilter captures listing constraints.
type UserFilter struct {
	CompanyID *uuid.UUID
	Limit     int
	Offset    int
}

// UserPage wraps paginated results.
type UserPage struct {
	Users    []User `json:"users"`
	Total    int64  `json:"total"`
	Page     int    `json:"page"`
	PageSize int    `json:"page_size"`
}

// Product represents a medicine SKU with batch tracking.
type Product struct {
	ID          uuid.UUID `db:"id" json:"id"`
	SellerID    uuid.UUID `db:"seller_id" json:"seller_id"`
	Name        string    `db:"name" json:"name"`
	Description string    `db:"description" json:"description"`
	Batch       string    `db:"batch" json:"batch"`
	ExpiresAt   time.Time `db:"expires_at" json:"expires_at"`
	PriceCents  int64     `db:"price_cents" json:"price_cents"`
	Stock       int64     `db:"stock" json:"stock"`
	CreatedAt   time.Time `db:"created_at" json:"created_at"`
	UpdatedAt   time.Time `db:"updated_at" json:"updated_at"`
}

// InventoryItem exposes stock tracking tied to product batches.
type InventoryItem struct {
	ProductID  uuid.UUID `db:"product_id" json:"product_id"`
	SellerID   uuid.UUID `db:"seller_id" json:"seller_id"`
	Name       string    `db:"name" json:"name"`
	Batch      string    `db:"batch" json:"batch"`
	ExpiresAt  time.Time `db:"expires_at" json:"expires_at"`
	Quantity   int64     `db:"quantity" json:"quantity"`
	PriceCents int64     `db:"price_cents" json:"price_cents"`
	UpdatedAt  time.Time `db:"updated_at" json:"updated_at"`
}

// InventoryFilter allows filtering by expiration window.
type InventoryFilter struct {
	ExpiringBefore *time.Time
}

// InventoryAdjustment records manual stock corrections.
type InventoryAdjustment struct {
	ID        uuid.UUID `db:"id" json:"id"`
	ProductID uuid.UUID `db:"product_id" json:"product_id"`
	Delta     int64     `db:"delta" json:"delta"`
	Reason    string    `db:"reason" json:"reason"`
	CreatedAt time.Time `db:"created_at" json:"created_at"`
}

// Order captures the status lifecycle and payment intent.
type Order struct {
	ID         uuid.UUID   `db:"id" json:"id"`
	BuyerID    uuid.UUID   `db:"buyer_id" json:"buyer_id"`
	SellerID   uuid.UUID   `db:"seller_id" json:"seller_id"`
	Status     OrderStatus `db:"status" json:"status"`
	TotalCents int64       `db:"total_cents" json:"total_cents"`
	Items      []OrderItem `json:"items"`
	CreatedAt  time.Time   `db:"created_at" json:"created_at"`
	UpdatedAt  time.Time   `db:"updated_at" json:"updated_at"`
}

// OrderItem stores SKU-level batch tracking.
type OrderItem struct {
	ID        uuid.UUID `db:"id" json:"id"`
	OrderID   uuid.UUID `db:"order_id" json:"order_id"`
	ProductID uuid.UUID `db:"product_id" json:"product_id"`
	Quantity  int64     `db:"quantity" json:"quantity"`
	UnitCents int64     `db:"unit_cents" json:"unit_cents"`
	Batch     string    `db:"batch" json:"batch"`
	ExpiresAt time.Time `db:"expires_at" json:"expires_at"`
}

// PaymentPreference wraps the data needed for Mercado Pago split payments.
type PaymentPreference struct {
	OrderID          uuid.UUID `json:"order_id"`
	Gateway          string    `json:"gateway"`
	CommissionPct    float64   `json:"commission_pct"`
	MarketplaceFee   int64     `json:"marketplace_fee"`
	SellerReceivable int64     `json:"seller_receivable"`
	PaymentURL       string    `json:"payment_url"`
}

// OrderStatus enumerates supported transitions.
type OrderStatus string

const (
	OrderStatusPending   OrderStatus = "Pendente"
	OrderStatusPaid      OrderStatus = "Pago"
	OrderStatusInvoiced  OrderStatus = "Faturado"
	OrderStatusDelivered OrderStatus = "Entregue"
)

// CartItem stores buyer selections with unit pricing.
type CartItem struct {
	ID          uuid.UUID `db:"id" json:"id"`
	BuyerID     uuid.UUID `db:"buyer_id" json:"buyer_id"`
	ProductID   uuid.UUID `db:"product_id" json:"product_id"`
	Quantity    int64     `db:"quantity" json:"quantity"`
	UnitCents   int64     `db:"unit_cents" json:"unit_cents"`
	ProductName string    `db:"product_name" json:"product_name"`
	Batch       string    `db:"batch" json:"batch"`
	ExpiresAt   time.Time `db:"expires_at" json:"expires_at"`
	CreatedAt   time.Time `db:"created_at" json:"created_at"`
	UpdatedAt   time.Time `db:"updated_at" json:"updated_at"`
}

// CartSummary aggregates cart totals and discounts.
type CartSummary struct {
	Items          []CartItem `json:"items"`
	SubtotalCents  int64      `json:"subtotal_cents"`
	DiscountCents  int64      `json:"discount_cents"`
	TotalCents     int64      `json:"total_cents"`
	DiscountReason string     `json:"discount_reason,omitempty"`
}