from . import settings


class ServiceBackend(object):
    """
    Service management backend base class
    
    It uses the _unit of work_ design principle, which allows bulk operations to
    be conviniently supported. Each backend generates the configuration for all
    the changes of all modified objects, reloading the daemon just once.
    """
    verbose_name = None
    model = None
    related_models = () # ((model, accessor__attribute),)
    script_method = methods.BashSSH
    function_method = methods.Python
    type = 'task' # 'sync'
    ignore_fields = []
    
    # TODO type: 'script', execution:'task'
    
    __metaclass__ = plugins.PluginMount
    
    def __unicode__(self):
        return type(self).__name__
    
    def __str__(self):
        return unicode(self)
    
    def __init__(self):
        self.cmds = []
    
    @classmethod
    def get_name(cls):
        return cls.__name__
    
    @classmethod
    def is_main(cls, obj):
        opts = obj._meta
        return cls.model == '%s.%s' % (opts.app_label, opts.object_name)
    
    @classmethod
    def get_related(cls, obj):
        opts = obj._meta
        model = '%s.%s' % (opts.app_label, opts.object_name)
        for rel_model, field in cls.related_models:
            if rel_model == model:
                related = obj
                for attribute in field.split('__'):
                    related = getattr(related, attribute)
                return related
        return None
    
    @classmethod
    def get_backends(cls):
        return cls.plugins
    
    @classmethod
    def get_choices(cls):
        backends = cls.get_backends()
        choices = ( (b.get_name(), b.verbose_name or b.get_name()) for b in backends )
        return sorted(choices, key=lambda e: e[1])
    
    def get_banner(self):
        time = datetime.now().strftime("%h %d, %Y %I:%M:%S")
        return "Generated by Orchestra %s" % time
    
    def append(self, *cmd):
        # aggregate commands acording to its execution method
        if isinstance(cmd[0], basestring):
            method = self.script_method
            cmd = cmd[0]
        else:
            method = self.function_method
            cmd = partial(*cmd)
        if not self.cmds or self.cmds[-1][0] != method:
            self.cmds.append((method, [cmd]))
        else:
            self.cmds[-1][1].append(cmd)
    
    def execute(self, server):
        from .models import BackendLog
        state = BackendLog.STARTED if self.cmds else BackendLog.SUCCESS
        log = BackendLog.objects.create(backend=self.get_name(), state=state, server=server)
        for method, cmds in self.cmds:
            method(log, server, cmds)
            if log.state != BackendLog.SUCCESS:
                break
        return log


def ServiceController(ServiceBackend):
    def save(self, obj)
        raise NotImplementedError
    
    def delete(self, obj):
        raise NotImplementedError
    
    def commit(self):
        """
        apply the configuration, usually reloading a service 
        reloading a service is done in a separated method in order to reload 
        the service once in bulk operations
        """
        pass


class ServiceMonitor(ServiceBackend):
    TRAFFIC = 'traffic'
    DISK = 'disk'
    MEMORY = 'memory'
    CPU = 'cpu'
    
    def prepare(self):
        pass
    
    def store(self, stdout):
        """ object_id value """
        for line in stdout.readlines():
            line = line.strip()
            object_id, value = line.split()
            # TODO date
            MonitorHistory.store(self.model, object_id, value, date)

    def monitor(self, obj):
        raise NotImplementedError
    
    def trigger(self, obj):
        raise NotImplementedError
    
    def execute(self, server):
        log = super(MonitorBackend, self).execute(server)
        
        return log


class AccountDisk(MonitorBackend):
    model = 'accounts.Account'
    resource = MonitorBackend.DISK
    verbose_name = 'Disk'
    
    def monitor(self, user):
        context = self.get_context(user)
        self.append("du -s %(home)s | {\n"
                    "   read value\n"
                    "   echo '%(username)s' $value\n"
                    "}" % context)
    
     def process(self, output):
        # TODO transaction
        for line in output.readlines():
            username, value = line.strip().slpit()
            History.store(object_id=user_id, value=value)


class MailmanTraffic(MonitorBackend):
    model = 'lists.List'
    resource = MonitorBackend.TRAFFIC
    
    def process(self, output):
        for line in output.readlines():
            listname, value = line.strip().slpit()
    
    def monitor(self, mailinglist):
        self.append("LISTS=$(grep -v 'post to mailman' /var/log/mailman/post"
                    "  | grep size | cut -d'<' -f2 | cut -d'>' -f1 | sort | uniq"
                    "  | while read line; do \n"
                    "     grep \"$line\" post | head -n1 | awk {'print $8\" \"$11'}"
                    "       | sed 's/size=//' | sed 's/,//'\n"
                    "done)")
        self.append('SUBS=""\n'
                    'while read LIST; do\n'
                    '   NAME=$(echo "$LIST" | awk {\'print $1\'})\n'
                    '   SIZE=$(echo "$LIST" | awk {\'print $2\'})\n'
                    '   if [[ ! $(echo -e "$SUBS" | grep "$NAME") ]]; then\n'
                    '       SUBS="${SUBS}${NAME} $(list_members "$NAME" | wc -l)\n"\n'
                    '   fi\n'
                    '   SUBSCRIBERS=$(echo -e "$SUBS" | grep "$NAME" | awk {\'print $2\'})\n'
                    '   echo "$NAME $(($SUBSCRIBERS*$SIZE))"\n'
                    'done <<< "$LISTS"')


class MailDisk(MonitorBackend):
    model = 'email.Mailbox'
    resource = MonitorBackend.DISK
    verbose_name = _("Mail disk")
    
    def process(self, output):
        pass
    
    def monitor(self, mail):
        pass


class MysqlDisk(MonitorBackend):
    model = 'database.Database'
    resource = MonitorBackend.DISK
    verbose_name = _("MySQL disk")
    
    def process(self, output):
        pass
    
    def monitor(self, db):
        pass


class OpenVZDisk(MonitorBackend):
    model = 'vps.VPS'
    resource = MonitorBackend.DISK


class OpenVZMemory(MonitorBackend):
    model = 'vps.VPS'
    resource = MonitorBackend.MEMORY


class OpenVZTraffic(MonitorBackend):
    model = 'vps.VPS'
    resource = MonitorBackend.TRAFFIC


class Apache2Traffic(MonitorBackend):
    model = 'websites.Website'
    resource = MonitorBackend.TRAFFIC
    verbose_name = _("Apache2 Traffic")
    
    def monitor(self, site):
        context = self.get_context(site)
        self.append("""
            awk 'BEGIN {
                ini = "%(start_date)s";
                end = "%(end_date)s";
                
                months["Jan"]="01";
                months["Feb"]="02";
                months["Mar"]="03";
                months["Apr"]="04";
                months["May"]="05";
                months["Jun"]="06";
                months["Jul"]="07";
                months["Aug"]="08";
                months["Sep"]="09";
                months["Oct"]="10";
                months["Nov"]="11";
                months["Dec"]="12";
            } {
                date = substr($4,2)
                year = substr(date,8,4)
                month = months[substr(date,4,3)];
                day = substr(date,1,2)
                hour = substr(date,13,2)
                minute = substr(date,16,2)
                second = substr(date,19,2);
                line_date = year month day hour minute second
                if ( line_date > ini && line_date < end)
                    if ( $10 == "" )
                        sum+=$9
                    else
                        sum+=$10;
            } END {
                print sum;
            }' %(log_file)s | {
                read value
                echo %(site_name)s $value
            }
            """ % context)
    
    def trigger(self, site):
        pass
    
    def get_context(self, site):
        return {
            'log_file': os.path.join(settings.WEBSITES_BASE_APACHE_LOGS, site.unique_name)
            
        }

# start_date and end_date expected format: YYYYMMDDhhmmss

function get_traffic(){


RESULT=$(get_traffic)

if [[ $RESULT ]]; then 
    echo $RESULT
else
    echo 0
fi

return 0