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 django.utils.timezone import timedelta as delta
from dateutil.relativedelta import relativedelta as reldelta
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])

    # Calculamos el rango del reporte y lo guardamos en UTC en la base de datos.
    def save(self, *args, **kwargs):
        range = self.get_report_range()
        self.start_report_date = range[0].astimezone(tz('UTC'))
        self.due_date = range[1].astimezone(tz('UTC'))
        super().save(*args, **kwargs)

    def get_report_range(self):
        # Por defecto frequencia Diaria:
        start_date = self.start_report_date.astimezone(tz('America/Argentina/Cordoba')).replace(hour=0, minute=0, second=0, microsecond=0)
        end_date = self.start_report_date.astimezone(tz('America/Argentina/Cordoba')).replace(hour=23, minute=59, second=59, microsecond=0)
        if self.frequency == "weekly":
            start_date -= delta(days=start_date.weekday())
            end_date += delta(days=(6 - end_date.weekday())) # Lunes de la siguiente semana
        elif self.frequency == "monthly":
            start_date = start_date.replace(day=1)
            end_date = (end_date.replace(day=1) + reldelta(months=1)).replace(day=1) - delta(days=1)
        elif self.frequency == "yearly":
            start_date = start_date.replace(day=1, month=1)
            end_date = (end_date.replace(day=1, month=1) + reldelta(years=1)) - delta(days=1)
        elif self.frequency != 'daily':
            return None
        return start_date, end_date

    # 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