from django.db import models
from .validators import json_email_array, json_not_empty_string_array, valid_frequency_format
from django.utils import timezone
from django.conf import settings
from api.config import CALENDAR_FREQUENCIES

class ProgrammedReport(models.Model):
    REPORT_FORMATS = [
        ("excel", "Excel"),
        ("csv", "CSV")
    ]

    name = models.CharField(max_length=100)
    user_id = models.CharField(max_length=2048)
    frequency = models.CharField(max_length=20, default="Mensual", validators=[valid_frequency_format])
    start_report_date = models.DateTimeField(
        default=timezone.now)
    last_report_date = models.DateTimeField(
        blank=True, null=True, default=None)
    due_date = models.DateTimeField(blank=True, null=True, default=None)

    # Valores que configuran al reporte:
    format = models.CharField(
        max_length=5, choices=REPORT_FORMATS)
    option = models.CharField(max_length=50, default="all")
    stations = models.JSONField(validators=[json_not_empty_string_array])
    modules = models.JSONField(validators=[json_not_empty_string_array])
    notified_emails = models.JSONField(
        validators=[json_not_empty_string_array, json_email_array])

    # Actualiza la due_date en cada save del modelo.
    def save(self, *args, **kwargs):
        base_date = self.last_report_date if self.last_report_date is not None else self.start_report_date
        self.due_date = base_date + CALENDAR_FREQUENCIES.get(
            self.frequency) if self.frequency in CALENDAR_FREQUENCIES else base_date + timezone.timedelta(seconds=int(self.frequency))
        super().save(*args, **kwargs)

    # Metodo que envía la petición a Clima para enviar el reporte.
    def send_report(self):
        import requests
        from django.conf import settings

        # Calculamos el formato en el que Clima requiere recibir los rangos.
        start_date = (self.last_report_date if self.last_report_date is not None else self.start_report_date).strftime(
            "%d/%m/%Y %H:%M")
        end_date = self.due_date.strftime("%d/%m/%Y %H:%M")

        # Enviamos la request:
        response = requests.post(settings.CLIMA_URL + "/async_report_handler", {
            "id": self.id,
            "user_id": self.user_id,
            "format": self.format,
            "stations": self.stations,
            "modules": self.modules,
            "option": self.option,
            "start_date": start_date,
            "end_date": end_date,
            "notified_emails": self.notified_emails
        }, headers={"AUTHORIZATION": settings.PROGRAMMED_REPORTS_SERVICE_AUTH_TOKEN})

        if response.status_code != 200:
            import logging
            logging.getLogger('django').error(
                "No se pudo enviar el reporte asincrono: %s\n Reason: %s", self, response.reason)
            # TODO! Seria ideal enviar un email al administrador para ver que paso.
            return False

        self.last_report_date = timezone.now()
        self.save()