from django.db import models
from django.contrib.auth.models import AbstractUser, Permission, Group

from product_directory.models import Product

# todo: нужно перенести уникальные поля в новую модель

# Справочник товаров
# class Product(models.Model):
#     name = models.CharField(max_length=255, verbose_name="Наименование товара")
#     manufacturer_name = models.CharField(max_length=255, verbose_name="Производитель")
#     manufacturer_country = models.CharField(max_length=255, verbose_name="Страна производителя")
#     manufacturer_code = models.CharField(max_length=50, verbose_name="Код производителя", blank=True, null=True)
#     dimensions = models.CharField(max_length=255, verbose_name="Размеры", blank=True, null=True)
#     unit_of_measure = models.CharField(max_length=50, verbose_name="Единица измерения")
#     shelf_life_days = models.IntegerField(verbose_name="Срок годности (дни)")
#     barcode = models.CharField(max_length=50, unique=True, verbose_name="Штрихкод")
#
#     def __str__(self):
#         return self.name

# Справочник должностей
class Position(models.Model):
    name = models.CharField(max_length=255, verbose_name="Наименование должности")
    hourly_rate = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Ставка в час")
    monthly_hours = models.IntegerField(verbose_name="Часы в месяц")

    def __str__(self):
        return self.name


# Справочник сотрудников
class Employee(AbstractUser):
    position = models.ForeignKey(Position, on_delete=models.SET_NULL, null=True, verbose_name="Должность")
    department = models.CharField(max_length=255, verbose_name="Подразделение")
    work_phone = models.CharField(max_length=20, blank=True, null=True, verbose_name="Рабочий телефон")
    personal_phone = models.CharField(max_length=20, blank=True, null=True, verbose_name="Личный телефон")
    email = models.EmailField(unique=True, verbose_name="Электронная почта")

    groups = models.ManyToManyField(
        Group,
        related_name='employee_groups',
        blank=True,
        verbose_name='Группы'
    )
    user_permissions = models.ManyToManyField(
        Permission,
        related_name='employee_permissions',
        blank=True,
        verbose_name='Разрешения'
    )

    def __str__(self):
        return self.get_full_name()

# Справочник мест хранения
class StorageLocation(models.Model):
    TYPE_CHOICES = [
        ('Store', 'Магазин'),
        ('Distribution Center', 'Распределительный центр'),
        ('Office', 'Офис'),
    ]
    name = models.CharField(max_length=255, verbose_name="Наименование")
    type = models.CharField(max_length=50, choices=TYPE_CHOICES, verbose_name="Тип места хранения")

    def __str__(self):
        return self.name

# Справочник контрагентов и договоров
class Contractor(models.Model):
    name = models.CharField(max_length=255, verbose_name="Наименование контрагента")
    address = models.TextField(verbose_name="Адрес")
    phone = models.CharField(max_length=20, verbose_name="Телефон")
    email = models.EmailField(verbose_name="Электронная почта")

    def __str__(self):
        return self.name


class SupplyContract(models.Model):
    contractor = models.ForeignKey(Contractor, on_delete=models.CASCADE, verbose_name="Контрагент")
    description = models.TextField(verbose_name="Описание")
    start_date = models.DateField(verbose_name="Дата начала")
    end_date = models.DateField(verbose_name="Дата окончания", blank=True, null=True)

    def __str__(self):
        return f"Договор с {self.contractor.name}"


# Справочник грузовиков
class Truck(models.Model):
    plate_number = models.CharField(max_length=20, verbose_name="Номерной знак")
    model = models.CharField(max_length=50, verbose_name="Модель")
    capacity = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Грузоподъемность (тонны)")

    def __str__(self):
        return self.plate_number

class StockOperation(models.Model):
    OPERATION_TYPE_CHOICES = [
        ('Incoming', 'Приход'),
        ('Outgoing', 'Расход'),
        ('Transfer', 'Перемещение'),
    ]
    product = models.ForeignKey(Product, on_delete=models.CASCADE, verbose_name="Товар")
    location = models.ForeignKey(StorageLocation, on_delete=models.CASCADE, verbose_name="Место хранения")
    operation_type = models.CharField(max_length=50, choices=OPERATION_TYPE_CHOICES, verbose_name="Тип операции")
    quantity = models.IntegerField(verbose_name="Количество")
    operation_date = models.DateTimeField(auto_now_add=True, verbose_name="Дата операции")
    expiration_date = models.DateField(blank=True, null=True, verbose_name="Срок годности")

    def __str__(self):
        return f"{self.operation_type} - {self.product.name}"


class PriceList(models.Model):
    PRICE_TYPE_CHOICES = [
        ('Regular', 'Регулярная'),
        ('Discount', 'Скидочная'),
        ('Promotional', 'Акционная'),
    ]
    product = models.ForeignKey(Product, on_delete=models.CASCADE, verbose_name="Товар")
    price_type = models.CharField(max_length=50, choices=PRICE_TYPE_CHOICES, verbose_name="Тип цены")
    entry_price = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Входная цена")
    final_price = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Итоговая цена")
    date_effective = models.DateField(verbose_name="Дата вступления в силу")
    constraint_percent_limit = models.DecimalField(max_digits=5, decimal_places=2, default=1000, verbose_name="Лимит на наценку (%)")
    constraint_price_change = models.DecimalField(max_digits=5, decimal_places=2, default=90, verbose_name="Лимит на изменение цены (%)")

    def __str__(self):
        return f"{self.price_type} - {self.product.name}"


class Inventory(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE, verbose_name="Товар")
    location = models.ForeignKey(StorageLocation, on_delete=models.CASCADE, verbose_name="Место хранения")
    quantity = models.IntegerField(verbose_name="Количество")
    inventory_date = models.DateField(verbose_name="Дата инвентаризации")

    def __str__(self):
        return f"Инвентаризация {self.product.name} - {self.location.name}"