# coding: utf-8

import subprocess
from email.mime.text import MIMEText
from collections import namedtuple
import click
import jinja2
import csv

Member = namedtuple('Member', ['id', 'cn', 'email', 'membership_type', 'due', 'last_bank'])


def sendmail(msg):
    p = subprocess.Popen(["/usr/sbin/sendmail", "-t"], stdin=subprocess.PIPE)
    p.communicate(msg.as_string())

@click.command()
@click.option('--dry-run', '-n', is_flag=True, help='Just test')
@click.option('--members', type=click.File('rb'), required=True, help='Members list CSV')
@click.option('--template', type=click.File('rb'), required=True, help='Mailing template')
@click.option('--limit', help='Only run for selected user')
@click.option('--continue', 'cont', type=int, help='Start with selected user')
@click.option('--from', 'from_', help='From field')
@click.option('--target-remote/--target-local', help='Send to mailRoutingAddress or local mailbox')
def mailer(dry_run, members, template, target_remote, limit=None, cont=None, from_=None):
    template = jinja2.Template(template.read().decode('utf-8'))

    for row in csv.reader(members):
        member = Member(*row)

        # FIXME id and due data type

        if limit and limit != member.id and limit != member.cn:
            click.echo(' == Ignoring {.cn}... '.format(member))
            continue

        if cont and int(cont) > int(member.id):
            click.echo(' == Ignoring {.cn}...'.format(member))
            continue

        click.echo(' ==== {0.id}: Sending mail to {0.cn} ...'.format(member))

        msg = template.make_module({
            'subject': 'Mailing',
            'member': member,
            })

        mail = MIMEText(str(msg), "plain", "utf-8")
        mail['From'] = from_
        mail['To'] = member.email if target_remote else '{.cn}@hackerspace.pl'.format(member)
        mail['Subject'] = getattr(msg, 'subject', 'Mailing')

        if not mail.get_payload(decode=True).strip():
            click.echo(' == Empty message, ignoring...')
            continue

        if dry_run:
            for k, v in mail.items():
                click.echo(u'{}: {}'.format(k, v))
            click.echo('\n' + mail.get_payload(decode=True))
        else:
            sendmail(mail)

if __name__ == "__main__":
    mailer()