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)

    @property
    def real_percentage(self):
        theoretical_max = (
            self.equipment.theoretical_maxs.filter(date__lte=self.session.start)
            .order_by("-date")
            .first()
        )
        return int(self.chosen_weight / theoretical_max.value * 1000) / 10