from django.db import models


class ProjectExternalBinding(models.Model):
    project = models.ForeignKey(
        "projects.Project", on_delete=models.PROTECT, related_name="bindings"
    )
    source = models.ForeignKey("commerce.SourceSystem", on_delete=models.PROTECT)
    external_id = models.CharField(max_length=255)
    object_type = models.CharField(max_length=50, default="project")
    external_name = models.CharField(max_length=255, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["source", "object_type", "external_id"],
                name="project_external_identity",
            )
        ]