from django.conf import settings
from django.db import models


class Room(models.Model):
    class Meta:
        verbose_name = 'salle'
        verbose_name_plural = 'salles'

    name = models.CharField('nom', max_length=300)
    latitude = models.DecimalField('latitude', max_digits=11, decimal_places=8, blank=True, null=True)
    longitude = models.DecimalField('longitude', max_digits=11, decimal_places=8, blank=True, null=True)
    notes = models.TextField('notes', blank=True)

    def __str__(self):
        return self.name


class Unit(models.Model):
    class Meta:
        verbose_name = 'unité'
        verbose_name_plural = 'unités'

    name = models.CharField('nom', max_length=50)

    def __str__(self):
        return self.name


class WorkForm(models.Model):
    class Meta:
        verbose_name = 'forme de travail'
        verbose_name_plural = 'formes de travail'

    name = models.CharField('nom', max_length=300)

    def __str__(self):
        return self.name


class Equipment(models.Model):
    class Meta:
        verbose_name = 'machine'
        verbose_name_plural = 'machines'

    name = models.CharField('nom', max_length=300)
    room = models.ForeignKey(
        verbose_name='salle',
        to=Room,
        on_delete=models.SET_NULL,
        related_name='equipments',
        null=True
    )
    unit = models.ForeignKey(
        verbose_name='unité',
        to=Unit,
        on_delete=models.PROTECT,
        null=True
    )
    default_work_form =  models.ForeignKey(
        verbose_name='forme de travail par défaut',
        to=WorkForm,
        on_delete=models.SET_NULL,
        null=True
    )
    default_repetition_number = models.PositiveIntegerField('nombre de répétitions par défaut', default=12)

    @property
    def last_theoretical_max(self):
        return self.theoretical_maxs.order_by('-date', '-pk').first()

    def __str__(self):
        return f'{self.name} ({self.room.name})'


class Setting(models.Model):
    class Meta:
        verbose_name = 'réglage'
        verbose_name_plural = 'réglages'

    equipment = models.ForeignKey(
        verbose_name='machine',
        to=Equipment,
        on_delete=models.CASCADE,
        related_name='settings'
    )
    name = models.CharField('nom', max_length=200)
    value = models.CharField('valeur', max_length=200)

    def __str__(self):
        return f'{self.name}={self.value}'


class TheoreticalMax(models.Model):
    class Meta:
        verbose_name = 'maximum théorique'
        verbose_name_plural = 'maximums théoriques'

    equipment = models.ForeignKey(
        verbose_name='machine',
        to=Equipment,
        on_delete=models.CASCADE,
        related_name='theoretical_maxs'
    )
    date = models.DateField('date')
    value = models.FloatField('valeur')

    def __str__(self):
        return f'{self.value} {self.equipment.unit.name} le {self.date:%d/%m/%Y}'


class Session(models.Model):
    class Meta:
        verbose_name = 'séance'
        verbose_name_plural = 'séances'

    start = models.DateTimeField('date et heure de début')
    room = models.ForeignKey(
        verbose_name='salle',
        to=Room,
        on_delete=models.SET_NULL,
        related_name='sessions',
        null=True
    )
    default_theoretical_max_percentage = models.PositiveIntegerField('pourcentage par défaut', default=65)
    notes = models.TextField('notes', blank=True)

    def __str__(self):
        import pytz
        server_timezone = pytz.timezone(settings.TIME_ZONE)
        server = server_timezone.normalize(self.start.astimezone(server_timezone))
        return f'{self.room} {server:%d/%m/%Y %H:%M} ({settings.TIME_ZONE})'


class Round(models.Model):
    class Meta:
        verbose_name = 'série'
        verbose_name_plural = 'séries'

    repetition_number = models.PositiveIntegerField('nombre de répétitions')
    equipment = models.ForeignKey(
        verbose_name='machine',
        to=Equipment,
        on_delete=models.CASCADE,
        related_name='rounds'
    )
    theoretical_max_percentage = models.PositiveIntegerField('pourcentage')
    chosen_weight = models.FloatField('charge choisie')
    session = models.ForeignKey(
        verbose_name='séance',
        to=Session,
        on_delete=models.CASCADE,
        related_name='rounds'
    )
    work_form = models.ForeignKey(
        verbose_name='forme de travail',
        to=WorkForm,
        on_delete=models.PROTECT,
        null=True
    )
    notes = models.TextField('notes', blank=True)