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331
invoices/models.py
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331
invoices/models.py
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from django.db import models
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from django.contrib.auth import get_user_model
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from common.models import NameSlugModel, BaseModel
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from simple_history.models import HistoricalRecords
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from django.core.exceptions import ValidationError
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from decimal import Decimal
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User = get_user_model()
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class Item(NameSlugModel):
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"""مدل آیتم‌های پیش‌فرض"""
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description = models.TextField(verbose_name="توضیحات", blank=True)
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unit_price = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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verbose_name="قیمت واحد"
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)
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default_quantity = models.PositiveIntegerField(
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default=1,
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verbose_name="تعداد پیش‌فرض"
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)
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is_default_in_quotes = models.BooleanField(
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default=False,
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verbose_name="پیش‌فرض در پیش‌فاکتورها",
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help_text="این آیتم به صورت پیش‌فرض در همه پیش‌فاکتورها قرار می‌گیرد"
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)
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created_by = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="ایجاد کننده")
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history = HistoricalRecords()
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class Meta:
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verbose_name = "آیتم"
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verbose_name_plural = "آیتم‌ها"
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ordering = ['name']
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def __str__(self):
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return f"{self.name} - {self.unit_price} تومان"
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class Quote(NameSlugModel):
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"""مدل پیش‌فاکتور"""
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process_instance = models.ForeignKey(
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'processes.ProcessInstance',
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on_delete=models.CASCADE,
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verbose_name="نمونه فرآیند"
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)
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customer = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="مشترک")
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status = models.CharField(
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max_length=20,
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choices=[
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('draft', 'پیش‌نویس'),
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('sent', 'ارسال شده'),
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('accepted', 'تایید شده'),
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('rejected', 'رد شده'),
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('expired', 'منقضی شده'),
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],
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default='draft',
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verbose_name="وضعیت"
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)
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total_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ کل"
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)
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discount_percent = models.DecimalField(
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max_digits=5,
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decimal_places=2,
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default=0,
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verbose_name="درصد تخفیف"
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)
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discount_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ تخفیف"
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)
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final_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ نهایی"
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)
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notes = models.TextField(verbose_name="یادداشت‌ها", blank=True)
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valid_until = models.DateField(verbose_name="معتبر تا")
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created_by = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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verbose_name="ایجاد کننده",
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related_name='created_quotes'
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)
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history = HistoricalRecords()
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class Meta:
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verbose_name = "پیش‌فاکتور"
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verbose_name_plural = "پیش‌فاکتورها"
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ordering = ['-created']
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def __str__(self):
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return f"پیش‌فاکتور {self.name} - {self.customer.get_full_name()}"
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def calculate_totals(self):
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"""محاسبه مبالغ کل"""
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total = sum(item.total_price for item in self.items.all())
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self.total_amount = total
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# محاسبه تخفیف
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if self.discount_percent > 0:
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self.discount_amount = (total * self.discount_percent) / 100
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else:
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self.discount_amount = 0
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self.final_amount = self.total_amount - self.discount_amount
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self.save()
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def get_status_display_with_color(self):
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"""نمایش وضعیت با رنگ"""
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status_colors = {
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'draft': 'secondary',
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'sent': 'primary',
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'accepted': 'success',
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'rejected': 'danger',
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'expired': 'warning',
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}
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color = status_colors.get(self.status, 'secondary')
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return '<span class="badge bg-{}">{}</span>'.format(color, self.get_status_display())
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class QuoteItem(BaseModel):
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"""مدل آیتم‌های پیش‌فاکتور"""
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quote = models.ForeignKey(Quote, on_delete=models.CASCADE, related_name='items', verbose_name="پیش‌فاکتور")
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item = models.ForeignKey(Item, on_delete=models.CASCADE, verbose_name="آیتم")
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quantity = models.PositiveIntegerField(verbose_name="تعداد")
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unit_price = models.DecimalField(max_digits=15, decimal_places=2, verbose_name="قیمت واحد")
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total_price = models.DecimalField(max_digits=15, decimal_places=2, verbose_name="قیمت کل")
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notes = models.TextField(verbose_name="یادداشت‌ها", blank=True)
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history = HistoricalRecords()
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class Meta:
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verbose_name = "آیتم پیش‌فاکتور"
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verbose_name_plural = "آیتم‌های پیش‌فاکتور"
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ordering = ['quote', 'item__name']
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def __str__(self):
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return f"{self.item.name} - {self.quantity} عدد"
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def save(self, *args, **kwargs):
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"""محاسبه قیمت کل"""
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self.total_price = self.quantity * self.unit_price
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super().save(*args, **kwargs)
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# بروزرسانی مبالغ پیش‌فاکتور
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self.quote.calculate_totals()
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class Invoice(NameSlugModel):
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"""مدل فاکتور نهایی"""
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quote = models.ForeignKey(
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Quote,
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on_delete=models.CASCADE,
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verbose_name="پیش‌فاکتور مربوطه",
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null=True,
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blank=True
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)
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process_instance = models.ForeignKey(
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'processes.ProcessInstance',
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on_delete=models.CASCADE,
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verbose_name="نمونه فرآیند"
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)
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customer = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="مشترک")
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status = models.CharField(
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max_length=20,
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choices=[
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('draft', 'پیش‌نویس'),
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('sent', 'ارسال شده'),
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('paid', 'پرداخت شده'),
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('partially_paid', 'نیمه پرداخت شده'),
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('overdue', 'معوق'),
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('cancelled', 'لغو شده'),
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],
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default='draft',
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verbose_name="وضعیت"
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)
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total_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ کل"
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)
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discount_percent = models.DecimalField(
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max_digits=5,
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decimal_places=2,
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default=0,
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verbose_name="درصد تخفیف"
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)
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discount_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ تخفیف"
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)
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final_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ نهایی"
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)
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paid_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ پرداخت شده"
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)
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remaining_amount = models.DecimalField(
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max_digits=15,
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decimal_places=2,
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default=0,
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verbose_name="مبلغ باقی‌مانده"
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)
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due_date = models.DateField(verbose_name="تاریخ سررسید")
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notes = models.TextField(verbose_name="یادداشت‌ها", blank=True)
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created_by = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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verbose_name="ایجاد کننده",
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related_name='created_invoices'
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)
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history = HistoricalRecords()
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class Meta:
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verbose_name = "فاکتور"
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verbose_name_plural = "فاکتورها"
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ordering = ['-created']
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def __str__(self):
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return f"فاکتور {self.name} - {self.customer.get_full_name()}"
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def calculate_totals(self):
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"""محاسبه مبالغ کل"""
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total = sum(item.total_price for item in self.items.all())
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self.total_amount = total
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# محاسبه تخفیف
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if self.discount_percent > 0:
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self.discount_amount = (total * self.discount_percent) / 100
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else:
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self.discount_amount = 0
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self.final_amount = self.total_amount - self.discount_amount
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self.remaining_amount = self.final_amount - self.paid_amount
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# بروزرسانی وضعیت
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if self.remaining_amount <= 0:
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self.status = 'paid'
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elif self.paid_amount > 0:
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self.status = 'partially_paid'
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else:
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self.status = 'sent'
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self.save()
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def get_status_display_with_color(self):
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"""نمایش وضعیت با رنگ"""
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status_colors = {
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'draft': 'secondary',
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'sent': 'primary',
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'paid': 'success',
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'partially_paid': 'info',
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'overdue': 'danger',
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'cancelled': 'warning',
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}
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color = status_colors.get(self.status, 'secondary')
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return '<span class="badge bg-{}">{}</span>'.format(color, self.get_status_display())
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class InvoiceItem(BaseModel):
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"""مدل آیتم‌های فاکتور"""
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invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE, related_name='items', verbose_name="فاکتور")
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item = models.ForeignKey(Item, on_delete=models.CASCADE, verbose_name="آیتم")
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quantity = models.PositiveIntegerField(verbose_name="تعداد")
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unit_price = models.DecimalField(max_digits=15, decimal_places=2, verbose_name="قیمت واحد")
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total_price = models.DecimalField(max_digits=15, decimal_places=2, verbose_name="قیمت کل")
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notes = models.TextField(verbose_name="یادداشت‌ها", blank=True)
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history = HistoricalRecords()
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class Meta:
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verbose_name = "آیتم فاکتور"
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verbose_name_plural = "آیتم‌های فاکتور"
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ordering = ['invoice', 'item__name']
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def __str__(self):
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return f"{self.item.name} - {self.quantity} عدد"
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def save(self, *args, **kwargs):
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"""محاسبه قیمت کل"""
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self.total_price = self.quantity * self.unit_price
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super().save(*args, **kwargs)
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# بروزرسانی مبالغ فاکتور
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self.invoice.calculate_totals()
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class Payment(BaseModel):
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"""مدل پرداخت‌ها"""
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invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE, related_name='payments', verbose_name="فاکتور")
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amount = models.DecimalField(max_digits=15, decimal_places=2, verbose_name="مبلغ پرداخت")
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payment_method = models.CharField(
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max_length=20,
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choices=[
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('cash', 'نقدی'),
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('bank_transfer', 'انتقال بانکی'),
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('check', 'چک'),
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('card', 'کارت بانکی'),
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('other', 'سایر'),
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],
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default='cash',
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verbose_name="روش پرداخت"
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)
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reference_number = models.CharField(max_length=100, verbose_name="شماره مرجع", blank=True)
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payment_date = models.DateField(verbose_name="تاریخ پرداخت")
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notes = models.TextField(verbose_name="یادداشت‌ها", blank=True)
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created_by = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="ثبت کننده")
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history = HistoricalRecords()
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class Meta:
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verbose_name = "پرداخت"
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verbose_name_plural = "پرداخت‌ها"
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ordering = ['-payment_date']
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def __str__(self):
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return f"پرداخت {self.amount} تومان - {self.invoice.name}"
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def save(self, *args, **kwargs):
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"""بروزرسانی مبالغ فاکتور"""
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super().save(*args, **kwargs)
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# بروزرسانی مبلغ پرداخت شده فاکتور
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total_paid = sum(payment.amount for payment in self.invoice.payments.all())
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self.invoice.paid_amount = total_paid
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self.invoice.calculate_totals()
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