#!/usr/bin/python
# -*- coding: utf-8 -*-


import cgi
import cgitb
import os
from email.mime.text import MIMEText
from subprocess import call
from datetime import datetime
from fnmatch import fnmatch
from string import Template
import json


def escapeTags(text):
    text = text.replace('<', '')
    text = text.replace('>', '')
    return text


def checkEntries(buchung):

    mailstring = '*@*'
    datestring = '[0-9][0-9].[0-9][0-9].[0-9][0-9][0-9][0-9]'
    entries = {'name': False, 'sender': False, 'dates': False}

    if len(buchung['name']) > 0:
        entries['name'] = True

    if fnmatch(buchung['sender'], mailstring):
        entries['sender'] = True

    try:
        if (fnmatch(buchung['begin'], datestring) and fnmatch(buchung['end'], datestring) and
            datetime.strptime(buchung['begin'], '%d.%m.%Y') >= datetime.now() and
            datetime.strptime(buchung['end'], '%d.%m.%Y') > datetime.strptime(buchung['begin'], '%d.%m.%Y')):
            entries['dates'] = True
    except ValueError:
        pass

    return entries


class Mail:

    def __init__(self, buchung, receiver, reply=False):
        self.buchung = buchung
        self.buchung['receiver'] = receiver
        self.reply = reply

    def genMailFile(self):
        # write email to file
        try:
            self.filename = "../data/email_" + datetime.now().strftime('%d-%m-%Y_%H-%M-%S-%f') + ".txt"
            fp = open(self.filename, 'wb')
            fp.write(self.msg)
            fp.close()
        except IOError:
            http = HttpResponse(url)
            http.sendError()
            exit()

    def sendMail(self):
        with open(os.devnull, 'wb') as DEVNULL:
            # send mail on strato powerweb
            #call(["mail", self.buchung['receiver']], stdin=open(self.filename))
            # what's with content type: '-a', "Content-Type: text/plain; charset=utf-8"
            self.ret = call(["mail", '-s', "Buchungsanfrage von " + self.buchung['name'],  \
                    '-r', self.buchung['sender'], self.buchung['receiver']],  \
                    stdin=open(self.filename), stdout=DEVNULL)
        return self.ret

    def genMail(self):
        # replace evil html tags
        self.buchung['msg'] = escapeTags(self.buchung['msg'])
        # gen mail text
        if self.reply is True:
            self.text = ("Buchungsanfrage:\n\nName: " + self.buchung['name'] +
                "\nEmail: " + self.buchung['receiver'] + "\nTelefon: " + self.buchung['tel'] +
                "\nAnreise: " + self.buchung['begin'] + "\nAbreise: " + self.buchung['end'] +
                "\nPersonen: " + self.buchung['persons'] + "\n\nNachricht:\n" + self.buchung['msg'])
        else:
            self.text = ("Buchungsanfrage:\n\nName: " + self.buchung['name'] +
                "\nEmail: " + self.buchung['sender'] + "\nTelefon: " + self.buchung['tel'] +
                "\nAnreise: " + self.buchung['begin'] + "\nAbreise: " + self.buchung['end'] +
                "\nPersonen: " + self.buchung['persons'] + "\n\nNachricht:\n" + self.buchung['msg'])
        # gen mail
        self.msg = self.text

class HttpResponse:

    def __init__(self, url='https://www.meissner-wohnen.de'):
        self.url = url

    def sendRedirect(self):
        # redirect to given url
        print 'Location: https://www.meissner-wohnen.de/%s' % self.url
        print ''

    def sendError(self):
        print "Content-type: text/html\n"
        print "<p>Uuups, da ist ein Fehler aufgetreten. Bitte zur <a href='https://www.meissner-wohnen.de'>Startseite</a> zur&uumlckkehren</p>"
        print "<p>Falls Sie eine Buchungsanfrage stellen m&oumlchten, bitte per Mail an: <a href='mailto:kontakt@meissner-wohnen.de'>kontakt@meissner-wohnen.de</a></p>"


def main():
    #cgitb.enable()

    # some values
    buchung         = {}
    blub            = ["name", "sender", "tel", "begin", "end", "persons", "msg", "reply"]
    template_values = {'name_warning': '', 'email_warning': '', 'date_warning': '', 'name': '', 'email': '', 'tel': '', 'msg': '', 'kopie': ''}
    url             = 'buchung'
    receiver        = 'kontakt@meissner-wohnen.de'

    # get cgi object
    form = cgi.FieldStorage()

    # bot detection
    if form.getvalue('email'):
        # logging
        now = datetime.now().strftime('%d.%m.%Y %H:%M:%S')
        f = open("../data/meissner_wohnen.log", "ab")
        f.write(now + " : " + cgi.escape(os.environ["REMOTE_ADDR"]) + " : bot detected\n")
        f.close()
        # gen and send http response
        http = HttpResponse(url + '.html')
        http.sendRedirect()
        exit()

    # get form values if exist
    for index in range(0, len(blub)):
        if form.getvalue(str(index)):
            buchung[blub[index]] = form.getvalue(str(index))
        else:
            buchung[blub[index]] = ""

    # check for valid entries
    test = checkEntries(buchung)

    # generate mails if entries are valid
    if (test['name'] and test['sender'] and test['dates']):

        msg = Mail(buchung, receiver)
        msg.genMail()
        msg.genMailFile()
        if msg.sendMail() != 0:
            http = HttpResponse(url)
            http.sendError()
            exit()

        if buchung['reply'] == 'true':
            receiver, buchung['sender'] = buchung['sender'], 'kontakt@meissner-wohnen.de'
            msg = Mail(buchung, receiver, True)
            msg.genMail()
            msg.genMailFile()
            if msg.sendMail() != 0:
                http = HttpResponse(url)
                http.sendError()
                exit()

        url = url + '_erfolgreich.html'

    # generate error site from template if entries are invalid
    else:

        if not test['name']:
            template_values['name_warning'] = 'warning'
        if not test['sender']:
            template_values['email_warning'] = 'warning'
        if not test['dates']:
            template_values['date_warning'] = 'warning'

        url = url + '_fehler.html'

        # read html template
        try:
            f = open("../data/buchung.template", "rb")
            html_template = Template(f.read())
            f.close()
        except IOError:
            http = HttpResponse(url)
            http.sendError()
            exit()

        # write templated html file
        try:
            f = open('../meissner-wohnen/%s' % url, "wb")
            f.write(html_template.safe_substitute(template_values))
            f.close()
        except IOError:
            http = HttpResponse(url)
            http.sendError()
            exit()

    # gen and send http response
    http = HttpResponse(url)
    http.sendRedirect()
    exit()

if __name__ == '__main__':
    main()