from django.db import models
from flower.common import ModelBase
from basic_info import models as basic_info_models


class PurchaseOrder(ModelBase):
    id = models.BigAutoField(primary_key=True)
    supplier = models.ForeignKey(basic_info_models.Supplier, on_delete=models.PROTECT, related_name='purchase_orders', verbose_name='供应商')
    order_date = models.DateField(verbose_name='订单日期')
    total_amount = models.DecimalField(max_digits=15, decimal_places=2, verbose_name='总金额')
    remarks = models.TextField(blank=True, null=True, verbose_name='备注')

    def __str__(self):
        return f'采购订单 {self.id} - {self.supplier.name}'

    class Meta:
        verbose_name = '采购单'
        verbose_name_plural = '采购单'


class Inventory(ModelBase):
    id = models.BigAutoField(primary_key=True)
    product = models.ForeignKey(
        basic_info_models.Product,
        on_delete=models.PROTECT,
        related_name='inventories',
        verbose_name='产品',
    )
    warehouse = models.ForeignKey(
        basic_info_models.WareHouse,
        on_delete=models.PROTECT,
        related_name='inventories',
        verbose_name='仓库',
    )
    quantity = models.IntegerField(verbose_name='库存数量')
    num_of_rolls = models.IntegerField(null=True, blank=True, verbose_name='匹数')
    minimum_quantity = models.IntegerField(null=True, blank=True, verbose_name='最低库存量')
    spec = models.CharField(max_length=100, blank=True, null=True, verbose_name='规格')
    description = models.TextField(blank=True, null=True, verbose_name='备注描述')

    def __str__(self):
        return f'库存 {self.product.name} - 仓库: {self.warehouse.name}'

    class Meta:
        verbose_name = '库存'
        verbose_name_plural = '库存'