import pghistory
from django.core.validators import MaxValueValidator, MinValueValidator
from django.db import models
from django.db.models import functions

from apps.core.history import TrackedModel


@pghistory.track()
class RideReview(TrackedModel):
    """
    A review of a ride.
    """

    ride = models.ForeignKey("rides.Ride", on_delete=models.CASCADE, related_name="reviews")
    user = models.ForeignKey("accounts.User", on_delete=models.CASCADE, related_name="ride_reviews")
    rating = models.PositiveSmallIntegerField(validators=[MinValueValidator(1), MaxValueValidator(10)])
    title = models.CharField(max_length=200)
    content = models.TextField()
    visit_date = models.DateField()

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    # Moderation
    is_published = models.BooleanField(default=True)
    moderation_notes = models.TextField(blank=True)
    moderated_by = models.ForeignKey(
        "accounts.User",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="moderated_ride_reviews",
    )
    moderated_at = models.DateTimeField(null=True, blank=True)

    class Meta(TrackedModel.Meta):
        ordering = ["-created_at"]
        unique_together = ["ride", "user"]
        constraints = [
            # Business rule: Rating must be between 1 and 10 (database level
            # enforcement)
            models.CheckConstraint(
                name="ride_review_rating_range",
                check=models.Q(rating__gte=1) & models.Q(rating__lte=10),
                violation_error_message="Rating must be between 1 and 10",
            ),
            # Business rule: Visit date cannot be in the future
            models.CheckConstraint(
                name="ride_review_visit_date_not_future",
                check=models.Q(visit_date__lte=functions.Now()),
                violation_error_message="Visit date cannot be in the future",
            ),
            # Business rule: If moderated, must have moderator and timestamp
            models.CheckConstraint(
                name="ride_review_moderation_consistency",
                check=models.Q(moderated_by__isnull=True, moderated_at__isnull=True)
                | models.Q(moderated_by__isnull=False, moderated_at__isnull=False),
                violation_error_message=("Moderated reviews must have both moderator and moderation " "timestamp"),
            ),
        ]

    def __str__(self):
        return f"Review of {self.ride.name} by {self.user.username}"
