"""Clean Plugin for WordOps."""

import os
import urllib.request

from cement.core import handler, hook
from cement.core.controller import CementBaseController, expose

from wo.core.aptget import WOAptGet
from wo.core.logging import Log
from wo.core.services import WOService
from wo.core.shellexec import WOShellExec


def wo_clean_hook(app):
    pass


class WOCleanController(CementBaseController):
    class Meta:
        label = 'clean'
        stacked_on = 'base'
        stacked_type = 'nested'
        description = (
            'Clean NGINX FastCGI cache, Opcache, Redis Cache')
        arguments = [
            (['--all'],
                dict(help='Clean all cache', action='store_true')),
            (['--fastcgi'],
                dict(help='Clean FastCGI cache', action='store_true')),
            (['--opcache'],
                dict(help='Clean OpCache', action='store_true')),
            (['--redis'],
                dict(help='Clean Redis Cache', action='store_true')),
        ]
        usage = "wo clean [options]"

    @expose(hide=True)
    def default(self):
        pargs = self.app.pargs
        if (not (pargs.all or pargs.fastcgi
                 or pargs.opcache or
                 pargs.redis)):
            self.clean_fastcgi()
        if pargs.all:
            self.clean_fastcgi()
            self.clean_opcache()
            self.clean_redis()
        if pargs.fastcgi:
            self.clean_fastcgi()
        if pargs.opcache:
            self.clean_opcache()
        if pargs.redis:
            self.clean_redis()

    @expose(hide=True)
    def clean_redis(self):
        """This function clears Redis cache"""
        if(WOAptGet.is_installed(self, "redis-server")):
            Log.info(self, "Cleaning Redis cache")
            WOShellExec.cmd_exec(self, "redis-cli flushall")
        else:
            Log.info(self, "Redis is not installed")

    @expose(hide=True)
    def clean_fastcgi(self):
        if(os.path.isdir("/var/run/nginx-cache")):
            Log.info(self, "Cleaning NGINX FastCGI cache")
            WOShellExec.cmd_exec(self, "rm -rf /var/run/nginx-cache/*")
            WOService.restart_service(self, 'nginx')
        else:
            Log.error(self, "Unable to clean FastCGI cache", False)

    @expose(hide=True)
    def clean_opcache(self):
        try:
            Log.info(self, "Cleaning opcache")
            urllib.request.urlopen("https://127.0.0.1:22222/cache"
                                   "/opcache/opgui.php?reset=1").read()
        except Exception as e:
            Log.debug(self, "{0}".format(e))
            Log.debug(self, "Unable hit url, "
                      " https://127.0.0.1:22222/cache/opcache/"
                      "opgui.php?reset=1,"
                      " please check you have admin tools installed")
            Log.debug(self, "please check you have admin tools installed,"
                      " or install them with `wo stack install --admin`")
            Log.error(self, "Unable to clean opcache", False)


def load(app):
    # register the plugin class.. this only happens if the plugin is enabled
    handler.register(WOCleanController)
    # register a hook (function) to run after arguments are parsed.
    hook.register('post_argument_parsing', wo_clean_hook)