from django.db import models
from django.utils.translation import gettext_lazy as _
from filer.fields.image import FilerImageField



class Transmitters(models.Model):
    full_name = models.CharField(max_length=255, verbose_name=_('full name'))
    birth_year_hijri = models.IntegerField(verbose_name=_("Birth Year (Hijri)"), null=True, blank=True)
    death_year_hijri = models.IntegerField(verbose_name=_("Death Year (Hijri)"), null=True, blank=True)
    description = models.TextField(blank=True, null=True, verbose_name=_("Description"))
    thumbnail = FilerImageField(
        related_name="+",
        on_delete=models.CASCADE,
        help_text=_('image allowed'),
        null=True,
        blank=True
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))

    class Meta:
        verbose_name = _('Transmitter')
        verbose_name_plural = _('Transmitters')
        ordering = ('full_name',)

    def __str__(self):
        return self.full_name



class HadisTransmitter(models.Model):

    hadis = models.ForeignKey(
        "hadis.Hadis",
        on_delete=models.CASCADE,
        verbose_name=_('hadis'),
        related_name='transmitters'
    )
    transmitter = models.ForeignKey(
        Transmitters,
        on_delete=models.CASCADE,
        verbose_name=_('transmitter'),
        related_name='hadises',
        null=True,
        blank=True,
        help_text=_('Leave empty if this represents a gap in the chain')
    )
    status = models.ForeignKey(
        "hadis.HadisStatus",
        on_delete=models.SET_NULL,
        verbose_name=_('status'),
        related_name='transmitters',
        null=True,
        blank=True
    )
    order = models.PositiveIntegerField(
        default=0,
        verbose_name=_('Order'),
        help_text=_('Order in the chain of transmission')
    )
    is_gap = models.BooleanField(
        default=False,
        verbose_name=_('Is Gap'),
        help_text=_('Check this if this represents a gap in the transmission chain')
    )

    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))

    class Meta:
        verbose_name = _('Hadis Transmitter')
        verbose_name_plural = _('Hadis Transmitters')
        ordering = ('hadis', 'order')
        unique_together = ('hadis', 'transmitter', 'order')

    def __str__(self):
        return f'{self.hadis.number} - {self.transmitter.full_name if self.transmitter else "Gap"} ({self.order})'