from django.db import models
from django.conf import settings
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.fields import GenericForeignKey
from django.utils import timezone
from django.utils.translation import gettext_lazy as _

INSPECTION_RESULT_CHOICES = (
    ('compliant', _('Conforme')),
    ('non_compliant', _('Non conforme / Anomalie')),
    ('updated', _('Données corrigées')),
    ('damaged', _('Endommagé')),
    ('missing', _('Absent / Retiré')),
)


class AssetInspection(models.Model):
    """
    Modèle d'enregistrement générique d'une vérification/inspection sur le terrain d'un asset.
    Contient uniquement les données communes à tous les assets.
    """
    asset_content_type = models.ForeignKey(
        ContentType,
        on_delete=models.CASCADE,
        verbose_name=_("Type d'asset"),
        limit_choices_to={'app_label': 'assets'}
    )
    asset_object_id = models.PositiveIntegerField(verbose_name=_("ID de l'asset"))
    asset = GenericForeignKey('asset_content_type', 'asset_object_id')

    inspector = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='asset_inspections',
        verbose_name=_("Inspecteur / Vérificateur")
    )
    inspection_date = models.DateTimeField(default=timezone.now, verbose_name=_("Date d'inspection"))

    result_status = models.CharField(
        max_length=50,
        choices=INSPECTION_RESULT_CHOICES,
        default='compliant',
        verbose_name=_("Résultat du contrôle")
    )

    verified_obsolescence = models.CharField(
        max_length=50,
        null=True,
        blank=True,
        verbose_name=_("État d'obsolescence constaté")
    )

    notes = models.TextField(null=True, blank=True, verbose_name=_("Remarques / Constats"))
    apply_changes_to_asset = models.BooleanField(
        default=True,
        verbose_name=_("Appliquer directement les modifications à l'asset")
    )

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

    class Meta:
        verbose_name = _("Inspection d'asset (Générique)")
        verbose_name_plural = _("Inspections d'assets (Génériques)")
        ordering = ['-inspection_date']

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)

        if self.apply_changes_to_asset and self.asset:
            target_asset = self.asset
            modified = False

            if hasattr(target_asset, 'last_inspection_date'):
                target_asset.last_inspection_date = self.inspection_date
                modified = True

            if hasattr(target_asset, 'inspection_status'):
                target_asset.inspection_status = self.result_status
                modified = True

            if hasattr(target_asset, 'validation_status'):
                target_asset.validation_status = 'validated'
                modified = True

            if hasattr(target_asset, 'is_compliant'):
                if self.result_status in ('non_compliant', 'damaged', 'missing'):
                    target_asset.is_compliant = False
                    if hasattr(target_asset, 'non_compliance_reason') and self.notes:
                        target_asset.non_compliance_reason = self.notes
                else:
                    target_asset.is_compliant = True
                    if hasattr(target_asset, 'non_compliance_reason'):
                        target_asset.non_compliance_reason = None
                modified = True

            if self.verified_obsolescence and hasattr(target_asset, 'obsolescence'):
                target_asset.obsolescence = self.verified_obsolescence
                modified = True

            if modified:
                target_asset.save()

    def __str__(self):
        asset_str = str(self.asset) if self.asset else f"Asset #{self.asset_object_id}"
        date_str = self.inspection_date.strftime('%d/%m/%Y') if self.inspection_date else ''
        return f"Inspection {asset_str} ({date_str}) - {self.get_result_status_display()}"


class ParkingSpotInspection(AssetInspection):
    """
    Spécialisation de l'inspection pour les emplacements de stationnement (vélos, trottinettes, livraison, PMR).
    """
    verified_standard_stand_count = models.IntegerField(
        null=True,
        blank=True,
        verbose_name=_("Nombre d'arceaux classiques constaté")
    )
    verified_cargo_stand_count = models.IntegerField(
        null=True,
        blank=True,
        verbose_name=_("Nombre d'arceaux cargo constaté")
    )
    verified_stand_type = models.CharField(
        max_length=50,
        null=True,
        blank=True,
        verbose_name=_("Type d'arceau constaté")
    )
    verified_has_scooter_drop_zone = models.BooleanField(
        null=True,
        blank=True,
        verbose_name=_("Drop zone trottinette constatée")
    )
    verified_marking_quality = models.CharField(
        max_length=50,
        null=True,
        blank=True,
        verbose_name=_("Qualité du marquage constatée")
    )

    class Meta:
        verbose_name = _("Inspection d'emplacement de stationnement")
        verbose_name_plural = _("Inspections d'emplacements de stationnement")

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)

        if self.apply_changes_to_asset and self.asset and self.asset.__class__.__name__ == 'ParkingSpot':
            target_asset = self.asset
            modified = False

            if self.verified_standard_stand_count is not None:
                target_asset.standard_stand_count = self.verified_standard_stand_count
                modified = True
            if self.verified_cargo_stand_count is not None:
                target_asset.cargo_stand_count = self.verified_cargo_stand_count
                modified = True
            if self.verified_stand_type is not None:
                target_asset.stand_type = self.verified_stand_type
                modified = True
            if self.verified_has_scooter_drop_zone is not None:
                target_asset.has_scooter_drop_zone = self.verified_has_scooter_drop_zone
                modified = True
            if self.verified_marking_quality is not None:
                target_asset.marking_quality = self.verified_marking_quality
                modified = True

            if modified:
                target_asset.save()