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 api.config import get_next_calendar_date, get_previous_calendar_date
from django.conf import settings
from django.utils.timezone import timedelta as delta
from pytz import timezone as tz
import requests
import logging
logger = logging.getLogger('django')


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="monthly", validators=[valid_frequency_format])
    start_report_date = models.DateTimeField(
        default=timezone.now)
    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):
        self.start_report_date = get_previous_calendar_date(self.start_report_date.replace(tzinfo=tz('UTC')), self.frequency) + delta(seconds=1)
        self.due_date = get_next_calendar_date(self.start_report_date, self.frequency)
        super().save(*args, **kwargs)

    # Metodo que envía la petición a Clima para enviar el reporte.
    def send_report(self):
        # Calculamos el formato en el que Clima requiere recibir los rangos.
        start_date = self.start_report_date.astimezone(tz('America/Argentina/Cordoba')).strftime("%d/%m/%Y %H:%M")
        end_date = self.due_date.astimezone(tz('America/Argentina/Cordoba')).strftime("%d/%m/%Y %H:%M")
        
        
        # Enviamos la request:
        response = requests.post(settings.CLIMA_URL + "/async_report_handler", {
            "id": self.id,
            "name": self.name,
            "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:
            logger.critical(
                "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.start_report_date = self.due_date + delta(seconds=1) # Pass to next cycle
        self.save()
        return True

    def send_report_now(self):
        # Calculamos el formato en el que Clima requiere recibir los rangos.
        start_date = self.start_report_date.astimezone(tz('America/Argentina/Cordoba')).strftime("%d/%m/%Y %H:%M")
        end_date = timezone.datetime.now().strftime("%d/%m/%Y %H:%M")

        # Enviamos la request:
        response = requests.post(settings.CLIMA_URL + "/async_report_handler", {
            "id": self.id,
            "name": self.name,
            "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:
            logger.critical(
                "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

        return True