from time import sleep
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
from django.utils.encoding import smart_str

from .models import Subscriber, MailingStatus



class SendShit():

    def __init__(self, newsletter, mailing, verbose=0):
        self.verbose = verbose
        self.newsletter = newsletter
        self.mailing = mailing 
        all_subscribers = Subscriber.objects.filter(newsletter=self.newsletter,subscribed=True,unsubscribed=False).values('email_field')
        already_sent = MailingStatus.objects.filter(newsletter_mailing=self.mailing,status=1).values('subscriber__email_field')
        self.subscribers = all_subscribers.difference(already_sent)


    def send_mailings(self):
        mailings = len(self.subscribers)
        print("mailing newsletter to %s subscribers"%mailings)
        i = 1
        for s in self.subscribers:
            subscriber = Subscriber.objects.get(newsletter=self.newsletter,email_field=s['email_field'],subscribed=True,unsubscribed=False)
            status = None
            if self.verbose == 1:
                print("mailing newsletter %s of %s to %s" %(i,mailings,subscriber))
            status, created = MailingStatus.objects.get_or_create(
                newsletter_mailing=self.mailing, 
                subscriber=subscriber,
            )
            # New instance, try sending
            if created:
                email = self.build_message(subscriber)
                status.status=1
                if self.verbose==1:
                    print("successfully sent %s the newsletter mailing %s"%(subscriber, self.mailing))
                status.save()
            else:
                # not new, check if error and resend or just continue
                if status.status == 2:
                    if self.verbose==1:
                        print("retrying error")
                    try: 
                        email = self.build_message(subscriber)
                        status.status=1
                        if self.verbose==1:
                            print("successfully sent %s the newsletter mailing %s"%(subscriber, self.mailing))
                    except:
                        status.status=2
                        if self.verbose == 1:
                            print("failed to send %s to %s"%(self.mailing, subscriber))
                status.save()
            i=i+1
            sleep(2)

    
    def build_message(self, subscriber):
        """
        Build the email as plain text with a 
        a multipart alternative for HTML 
        """
        subject = smart_str("%s: %s — %s" %(self.mailing.newsletter.title, self.mailing.get_issue_str(), self.mailing.title))
        from_email, to = 'Scott Gilbertson <sng@luxagraf.net>', subscriber.get_email()
        text_content = render_to_string(self.newsletter.get_template_plain(), {'object': self.mailing, 'subscriber':subscriber})
        html_content = render_to_string(self.newsletter.get_template_html(), {'object': self.mailing, 'subscriber':subscriber})
        #print(html_content)
        msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
        msg.attach_alternative(html_content, "text/html")
        #msg.Header.Add('List-Unsubscribe', '<https://luxagraf.net%s>' % subscriber.unsubscribe_activate_url)
        msg.send()

        '''
        for header, value in self.newsletter.server.custom_headers.items():
            message[header] = value
        '''
        return msg