from django.db import models
from django.utils.translation import gettext_lazy as _

from api.core.models.trackable_model import TrackableModel


class M2M_TemplateStep(TrackableModel):
    """
    Many to Many table for templates and steps (identified by the step type).
    A template can have the same step type multiple times, but there can't be two entries with the same order for one template.
    """

    template = models.ForeignKey("Template", on_delete=models.CASCADE)
    step_type = models.ForeignKey("StepType", on_delete=models.CASCADE)
    order = models.IntegerField(verbose_name=_("ordre"))
    default_notes = models.TextField(
        verbose_name=_("notes par défaut"), blank=True, default=""
    )

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["template", "order"],
                name="unique_template_order",
            )
        ]