# -*- coding: utf-8 -*-

""" License

    Copyright (C) 2013 YunoHost

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program; if not, see http://www.gnu.org/licenses

"""

""" yunohost_domain.py

    Manage domains
"""
import os
import sys
import datetime
import re
import shutil
import json
import yaml
import requests
from urllib import urlopen
from yunohost import YunoHostError, YunoHostLDAP, win_msg, colorize, validate, get_required_args
from yunohost_dyndns import dyndns_subscribe


def domain_list(filter=None, limit=None, offset=None):
    """
    List domains

    Keyword argument:
        filter -- LDAP filter used to search
        offset -- Starting number for domain fetching
        limit -- Maximum number of domain fetched

    """
    with YunoHostLDAP() as yldap:
        result_list = []
        if offset: offset = int(offset)
        else: offset = 0
        if limit: limit = int(limit)
        else: limit = 1000
        if not filter: filter = 'virtualdomain=*'

        result = yldap.search('ou=domains,dc=yunohost,dc=org', filter, attrs=['virtualdomain'])

        if result and len(result) > (0 + offset) and limit > 0:
            i = 0 + offset
            for domain in result[i:]:
                if i <= limit:
                    result_list.append(domain['virtualdomain'][0])
                    i += 1
        else:
            raise YunoHostError(167, _("No domain found"))

        return { 'Domains': result_list }


def domain_add(domains, main=False, dyndns=False):
    """
    Create a custom domain

    Keyword argument:
        domains -- Domain name to add
        main -- Is the main domain
        dyndns -- Subscribe to DynDNS

    """
    with YunoHostLDAP() as yldap:
        attr_dict = { 'objectClass' : ['mailDomain', 'top'] }
        ip = str(urlopen('http://ip.yunohost.org').read())
        now = datetime.datetime.now()
        timestamp = str(now.year) + str(now.month) + str(now.day)
        result = []

        if not isinstance(domains, list):
            domains = [ domains ]

        for domain in domains:
            try:
                if domain in domain_list()['Domains']: continue
            except YunoHostError: pass

            # DynDNS domain
            if dyndns and len(domain.split('.')) >= 3:
                r = requests.get('http://dyndns.yunohost.org/domains')
                dyndomains = json.loads(r.text)
                dyndomain  = '.'.join(domain.split('.')[1:])
                if dyndomain in dyndomains:
                    if os.path.exists('/etc/cron.d/yunohost-dyndns'):
                        raise YunoHostError(22, _("You already have a DynDNS domain"))
                    else:
                        dyndns_subscribe(domain=domain)

            # Commands
            ssl_dir = '/usr/share/yunohost/yunohost-config/ssl/yunoCA'
            ssl_domain_path  = '/etc/yunohost/certs/'+ domain
            with open(ssl_dir +'/serial', 'r') as f:
                serial = f.readline().rstrip()
            try: os.listdir(ssl_domain_path)
            except OSError: os.makedirs(ssl_domain_path)

            command_list = [
                'cp '+ ssl_dir +'/openssl.cnf '+ ssl_domain_path,
                'sed -i "s/yunohost.org/' + domain + '/g" '+ ssl_domain_path +'/openssl.cnf',
                'openssl req -new -config '+ ssl_domain_path +'/openssl.cnf -days 3650 -out '+ ssl_dir +'/certs/yunohost_csr.pem -keyout '+ ssl_dir +'/certs/yunohost_key.pem -nodes -batch',
                'openssl ca -config '+ ssl_domain_path +'/openssl.cnf -days 3650 -in '+ ssl_dir +'/certs/yunohost_csr.pem -out '+ ssl_dir +'/certs/yunohost_crt.pem -batch',
                'ln -s /etc/ssl/certs/ca-yunohost_crt.pem   '+ ssl_domain_path +'/ca.pem',
                'cp '+ ssl_dir +'/certs/yunohost_key.pem    '+ ssl_domain_path +'/key.pem',
                'cp '+ ssl_dir +'/newcerts/'+ serial +'.pem '+ ssl_domain_path +'/crt.pem',
                'chmod 755 '+ ssl_domain_path,
                'chmod 640 '+ ssl_domain_path +'/key.pem',
                'chmod 640 '+ ssl_domain_path +'/crt.pem',
                'chmod 600 '+ ssl_domain_path +'/openssl.cnf',
                'chown root:metronome '+ ssl_domain_path +'/key.pem',
                'chown root:metronome '+ ssl_domain_path +'/crt.pem'
            ]

            for command in command_list:
                if os.system(command) != 0:
                    raise YunoHostError(17, _("An error occurred during certificate generation"))

            try:
                yldap.validate_uniqueness({ 'virtualdomain' : domain })
            except YunoHostError:
                raise YunoHostError(17, _("Domain already created"))


            attr_dict['virtualdomain'] = domain

            try:
                with open('/var/lib/bind/'+ domain +'.zone') as f: pass
            except IOError as e:
                zone_lines = [
                 '$TTL    38400',
                 domain +'.      IN   SOA   ns.'+ domain +'. root.'+ domain +'. '+ timestamp +' 10800 3600 604800 38400',
                 domain +'.      IN   NS    ns.'+ domain +'.',
                 domain +'.      IN   A     '+ ip,
                 domain +'.      IN   MX    5 '+ domain +'.',
                 domain +'.      IN   TXT   "v=spf1 mx a -all"',
                 'ns.'+ domain +'.   IN   A     '+ ip,
                 '_xmpp-client._tcp.'+ domain +'.  IN   SRV   0  5   5222  '+ domain +'.',
                 '_xmpp-server._tcp.'+ domain +'.  IN   SRV   0  5   5269  '+ domain +'.',
                 '_jabber._tcp.'+ domain +'.       IN   SRV   0  5   5269  '+ domain +'.',
                ]
                if main:
                    zone_lines.extend([
                        'pubsub.'+ domain +'.   IN   A     '+ ip,
                        'muc.'+ domain +'.      IN   A     '+ ip,
                        'vjud.'+ domain +'.     IN   A     '+ ip
                    ])
                with open('/var/lib/bind/' + domain + '.zone', 'w') as zone:
                    for line in zone_lines:
                        zone.write(line + '\n')
            else:
                raise YunoHostError(17, _("Zone file already exists for ") + domain)

            conf_lines = [
                'zone "'+ domain +'" {',
                '    type master;',
                '    file "/var/lib/bind/'+ domain +'.zone";',
                '    allow-transfer {',
                '        127.0.0.1;',
                '        localnets;',
                '    };',
                '};'
            ]
            with open('/etc/bind/named.conf.local', 'a') as conf:
                for line in conf_lines:
                   conf.write(line + '\n')

            os.system('service bind9 reload')

            # XMPP
            try:
                with open('/etc/metronome/conf.d/'+ domain +'.cfg.lua') as f: pass
            except IOError as e:
                conf_lines = [
                    'VirtualHost "'+ domain +'"',
                    '  ssl = {',
                    '        key = "'+ ssl_domain_path +'/key.pem";',
                    '        certificate = "'+ ssl_domain_path +'/crt.pem";',
                    '  }',
                    '  authentication = "ldap2"',
                    '  ldap = {',
                    '     hostname      = "localhost",',
                    '     user = {',
                    '       basedn        = "ou=users,dc=yunohost,dc=org",',
                    '       filter        = "(&(objectClass=posixAccount)(mail=*@'+ domain +'))",',
                    '       usernamefield = "mail",',
                    '       namefield     = "cn",',
                    '       },',
                    '  }',
                ]
                with open('/etc/metronome/conf.d/' + domain + '.cfg.lua', 'w') as conf:
                    for line in conf_lines:
                        conf.write(line + '\n')

            os.system('mkdir -p /var/lib/metronome/'+ domain.replace('.', '%2e') +'/pep')
            os.system('chown -R metronome: /var/lib/metronome/')
            os.system('chown -R metronome: /etc/metronome/conf.d/')
            os.system('service metronome restart')


            # Nginx
            os.system('cp /usr/share/yunohost/yunohost-config/nginx/template.conf /etc/nginx/conf.d/'+ domain +'.conf')
            os.system('mkdir /etc/nginx/conf.d/'+ domain +'.d/')
            os.system('sed -i s/yunohost.org/'+ domain +'/g /etc/nginx/conf.d/'+ domain +'.conf')
            os.system('service nginx reload')

            if yldap.add('virtualdomain=' + domain + ',ou=domains', attr_dict):
                result.append(domain)
                continue
            else:
                raise YunoHostError(169, _("An error occured during domain creation"))


        os.system('yunohost app ssowatconf > /dev/null 2>&1')

        win_msg(_("Domain(s) successfully created"))

        return { 'Domains' : result }


def domain_remove(domains):
    """
    Delete domains

    Keyword argument:
        domains -- Domain(s) to delete

    """
    with YunoHostLDAP() as yldap:
        result = []

        if not isinstance(domains, list):
            domains = [ domains ]

        for domain in domains:
            # Check if apps are installed on the domain
            for app in os.listdir('/etc/yunohost/apps/'):
                with open('/etc/yunohost/apps/' + app +'/settings.yml') as f:
                    if yaml.load(f)['domain'] == domain:
                        raise YunoHostError(1, _("One or more apps are installed on this domain, please uninstall them before proceed to domain removal"))

            if yldap.remove('virtualdomain=' + domain + ',ou=domains'):
                try:
                    shutil.rmtree('/etc/yunohost/certs/'+ domain)
                    os.remove('/var/lib/bind/'+ domain +'.zone')
                    shutil.rmtree('/var/lib/metronome/'+ domain.replace('.', '%2e'))
                    os.remove('/etc/metronome/conf.d/'+ domain +'.cfg.lua')
                    shutil.rmtree('/etc/nginx/conf.d/'+ domain +'.d')
                    os.remove('/etc/nginx/conf.d/'+ domain +'.conf')
                except:
                    pass
                with open('/etc/bind/named.conf.local', 'r') as conf:
                    conf_lines = conf.readlines()
                with open('/etc/bind/named.conf.local', 'w') as conf:
                    in_block = False
                    for line in conf_lines:
                        if re.search(r'^zone "'+ domain, line):
                            in_block = True
                        if in_block:
                            if re.search(r'^};$', line):
                                in_block = False
                        else:
                            conf.write(line)
                result.append(domain)
                continue
            else:
                raise YunoHostError(169, _("An error occured during domain deletion"))

        os.system('yunohost app ssowatconf > /dev/null 2>&1')
        os.system('service nginx reload')
        os.system('service bind9 reload')
        os.system('service metronome restart')

        win_msg(_("Domain(s) successfully deleted"))

        return { 'Domains' : result }