from couchpotato.api import addApiView
from couchpotato.core.event import addEvent, fireEvent
from couchpotato.core.helpers.request import jsonified
from couchpotato.core.logger import CPLog
from couchpotato.core.plugins.base import Plugin
from couchpotato.environment import Env
from git.repository import LocalRepository
import os
import time
import traceback

log = CPLog(__name__)


class Updater(Plugin):

    repo_name = 'RuudBurger/CouchPotatoServer'

    running = False
    version = None
    update_failed = False
    update_version = None
    last_check = 0

    def __init__(self):

        self.repo = LocalRepository(Env.get('app_dir'), command = self.conf('git_command', default = 'git'))

        fireEvent('schedule.interval', 'updater.check', self.check, hours = 6)

        addEvent('app.load', self.check)

        addApiView('updater.info', self.getInfo)
        addApiView('updater.update', self.doUpdateView)

    def getInfo(self):

        return jsonified({
            'repo_name': self.repo_name,
            'last_check': self.last_check,
            'update_version': self.update_version,
            'version': self.getVersion()
        })

    def getVersion(self):

        if not self.version:
            try:
                output = self.repo.getHead() # Yes, please
                log.debug('Git version output: %s' % output.hash)
                self.version = {
                    'hash': output.hash[:8],
                    'date': output.getDate(),
                }
            except Exception, e:
                log.error('Failed using GIT updater, running from source, you need to have GIT installed. %s' % e)
                return 'No GIT'

        return self.version

    def check(self):

        if self.update_version or self.isDisabled():
            return

        log.info('Checking for new version on github for %s' % self.repo_name)
        if not Env.setting('development'):
            self.repo.fetch()

        current_branch = self.repo.getCurrentBranch().name

        for branch in self.repo.getRemoteByName('origin').getBranches():
            if current_branch == branch.name:

                local = self.repo.getHead()
                remote = branch.getHead()

                log.info('Versions, local:%s, remote:%s' % (local.hash[:8], remote.hash[:8]))

                if local.getDate() < remote.getDate():
                    if self.conf('automatic') and not self.update_failed:
                        if self.doUpdate():
                            fireEvent('app.crappy_restart')
                    else:
                        self.update_version = {
                            'hash': remote.hash[:8],
                            'date': remote.getDate(),
                        }
                        if self.conf('notification'):
                            fireEvent('updater.available', message = 'A new update is available', data = self.getVersion())

        self.last_check = time.time()

    def doUpdateView(self):
        return jsonified({
            'success': self.doUpdate()
        })

    def doUpdate(self):
        try:
            log.debug('Stashing local changes')
            self.repo.saveStash()

            log.info('Updating to latest version')
            self.repo.pull()

            # Delete leftover .pyc files
            self.deletePyc()

            return True
        except:
            log.error('Failed updating via GIT: %s' % traceback.format_exc())

        self.update_failed = True

        return False

    def deletePyc(self):

        for root, dirs, files in os.walk(Env.get('app_dir')):

            pyc_files = filter(lambda filename: filename.endswith('.pyc'), files)
            py_files = set(filter(lambda filename: filename.endswith('.py'), files))
            excess_pyc_files = filter(lambda pyc_filename: pyc_filename[:-1] not in py_files, pyc_files)

            for excess_pyc_file in excess_pyc_files:
                full_path = os.path.join(root, excess_pyc_file)
                log.debug('Removing old PYC file: %s' % full_path)
                try:
                    os.remove(full_path)
                except:
                    log.error('Couldn\'t remove %s: %s' % (full_path, traceback.format_exc()))

    def isEnabled(self):
        return Plugin.isEnabled(self) and Env.get('uses_git')