from django.db import models


class ExternalProject(models.Model):
    source = models.ForeignKey("commerce.SourceSystem", on_delete=models.PROTECT)
    external_id = models.CharField(max_length=255)
    name = models.CharField(max_length=255)
    code = models.CharField(max_length=255, blank=True)
    description = models.TextField(blank=True)
    archived = models.BooleanField(default=False)
    synced_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        ordering = ["name", "pk"]
        constraints = [
            models.UniqueConstraint(
                fields=["source", "external_id"], name="commerce_project_source_id"
            )
        ]

    def __str__(self):
        return self.name


class ProjectPayment(models.Model):
    """Outgoing cash documents; never automatically deducted from sale profit."""

    source = models.ForeignKey("commerce.SourceSystem", on_delete=models.PROTECT)
    source_record = models.ForeignKey("commerce.SourceRecord", on_delete=models.PROTECT)
    project = models.ForeignKey(
        ExternalProject, null=True, blank=True, on_delete=models.PROTECT
    )
    external_id = models.CharField(max_length=255)
    document_type = models.CharField(
        max_length=16,
        choices=[("paymentout", "Исходящий платёж"), ("cashout", "Расходный ордер")],
    )
    number = models.CharField(max_length=255, blank=True)
    description = models.TextField(blank=True)
    expense_category = models.CharField(max_length=255, blank=True)
    payee = models.CharField(max_length=255, blank=True)
    amount = models.DecimalField(max_digits=18, decimal_places=2)
    currency = models.CharField(max_length=3)
    occurred_at = models.DateTimeField(db_index=True)
    applicable = models.BooleanField(default=False)
    missing_from_source = models.BooleanField(default=False)
    seen_at = models.DateTimeField()

    class Meta:
        ordering = ["-occurred_at", "-pk"]
        constraints = [
            models.UniqueConstraint(
                fields=["source", "document_type", "external_id"],
                name="commerce_project_payment_id",
            ),
            models.CheckConstraint(
                condition=models.Q(amount__gte=0),
                name="commerce_project_payment_amount",
            ),
        ]