#!/usr/bin/env python

# encoding: utf-8

# summary controller for pylons

# Copyright (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>

# 

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; version 2

# of the License or (at your opinion) any later version of the license.

# 

# 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 General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

# MA  02110-1301, USA.

"""

Created on April 18, 2010

summary controller for pylons

@author: marcink

"""

from pylons import tmpl_context as c, request, url

from pylons_app.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator

from pylons_app.lib.base import BaseController, render

from pylons_app.lib.utils import OrderedDict

from pylons_app.model.hg_model import HgModel

from pylons_app.model.db import Statistics

from webhelpers.paginate import Page

from pylons_app.lib.celerylib import run_task

from pylons_app.lib.celerylib.tasks import get_commits_stats

from datetime import datetime, timedelta

from time import mktime

import calendar

import logging

import json

log = logging.getLogger(__name__)

class SummaryController(BaseController):

    @LoginRequired()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')           

    def __before__(self):

        super(SummaryController, self).__before__()

    def index(self):

        hg_model = HgModel()

        c.repo_info = hg_model.get_repo(c.repo_name)

        c.repo_changesets = Page(list(c.repo_info[:10]), page=1, items_per_page=20)

        e = request.environ

                                        'protocol': e.get('wsgi.url_scheme'),

                                        'user':str(c.hg_app_user.username),

                                        'host':e.get('HTTP_HOST'),

                                        'repo_name':c.repo_name, }

        c.clone_repo_url = uri

        c.repo_tags = OrderedDict()

        for name, hash in c.repo_info.tags.items()[:10]:

            c.repo_tags[name] = c.repo_info.get_changeset(hash)

        c.repo_branches = OrderedDict()

        for name, hash in c.repo_info.branches.items()[:10]:

            c.repo_branches[name] = c.repo_info.get_changeset(hash)

        td = datetime.today() + timedelta(days=1) 

        y, m, d = td.year, td.month, td.day

        ts_min_y = mktime((y - 1, (td - timedelta(days=calendar.mdays[m])).month,

                            d, 0, 0, 0, 0, 0, 0,))

        ts_min_m = mktime((y, (td - timedelta(days=calendar.mdays[m])).month,

                            d, 0, 0, 0, 0, 0, 0,))

        ts_max_y = mktime((y, m, d, 0, 0, 0, 0, 0, 0,))

        run_task(get_commits_stats, c.repo_info.name, ts_min_y, ts_max_y)

        c.ts_min = ts_min_m

        c.ts_max = ts_max_y

        stats = self.sa.query(Statistics)\

            .filter(Statistics.repository == c.repo_info.dbrepo)\

            .scalar()

        if stats and stats.languages:

            lang_stats = json.loads(stats.languages)

            c.commit_data = stats.commit_activity

            c.overview_data = stats.commit_activity_combined

            c.trending_languages = json.dumps(OrderedDict(

                                       sorted(lang_stats.items(), reverse=True,

                                            key=lambda k: k[1])[:2]

                                        )

                                    )

            print c.trending_languages

        else:

            c.commit_data = json.dumps({})

            c.overview_data = json.dumps([[ts_min_y, 0], [ts_max_y, 0] ])

            c.trending_languages = json.dumps({})

        return render('summary/summary.html')

    sa = meta.Session

    user.permissions['repositories'] = {}

    user.permissions['global'] = set()

    #===========================================================================

    # fetch default permissions

    #===========================================================================

    default_perms = sa.query(RepoToPerm, Repository, Permission)\

        .join((Repository, RepoToPerm.repository_id == Repository.repo_id))\

        .join((Permission, RepoToPerm.permission_id == Permission.permission_id))\

        .filter(RepoToPerm.user == sa.query(User).filter(User.username == 

                                            'default').scalar()).all()

    if user.is_admin:

        #=======================================================================

        # #admin have all default rights set to admin        

        #=======================================================================

        user.permissions['global'].add('hg.admin')

        for perm in default_perms:

            p = 'repository.admin'

            user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p

    else:

        #=======================================================================

        # set default permissions

        #=======================================================================

        #default global

        default_global_perms = sa.query(UserToPerm)\

            .filter(UserToPerm.user == sa.query(User).filter(User.username == 

            'default').one())

        for perm in default_global_perms:

            user.permissions['global'].add(perm.permission.permission_name)

        #default repositories

        for perm in default_perms:

            if perm.Repository.private and not perm.Repository.user_id == user.user_id:

                #disable defaults for private repos,

                p = 'repository.none'

            elif perm.Repository.user_id == user.user_id:

                #set admin if owner

                p = 'repository.admin'

            else:

                p = perm.Permission.permission_name

            user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p

        #=======================================================================

        # #overwrite default with user permissions if any

        #=======================================================================

        user_perms = sa.query(RepoToPerm, Permission, Repository)\

            .join((Repository, RepoToPerm.repository_id == Repository.repo_id))\

            .join((Permission, RepoToPerm.permission_id == Permission.permission_id))\

            .filter(RepoToPerm.user_id == user.user_id).all()

        for perm in user_perms:

            if perm.Repository.user_id == user.user_id:#set admin if owner

                p = 'repository.admin'

            else:

                p = perm.Permission.permission_name

            user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p

    meta.Session.remove()         

    return user

def get_user(session):

    """

    Gets user from session, and wraps permissions into user

    @param session:

    """

    user = session.get('hg_app_user', AuthUser())

    if user.is_authenticated:

        user = fill_data(user)

    user = fill_perms(user)

    session['hg_app_user'] = user

    session.save()

    return user

#===============================================================================

# CHECK DECORATORS

#===============================================================================

class LoginRequired(object):

    """Must be logged in to execute this function else redirect to login page"""

    def __call__(self, func):

        return decorator(self.__wrapper, func)

    def __wrapper(self, func, *fargs, **fkwargs):

        user = session.get('hg_app_user', AuthUser())

        log.debug('Checking login required for user:%s', user.username)

        if user.is_authenticated:

            log.debug('user %s is authenticated', user.username)

            return func(*fargs, **fkwargs)

        else:

            log.warn('user %s not authenticated', user.username)

            if request.environ.get('QUERY_STRING'):

                p += '?' + request.environ.get('QUERY_STRING')

            log.debug('redirecting to login page with %s', p)                

            return redirect(url('login_home', came_from=p))

class PermsDecorator(object):

    """Base class for decorators"""

    def __init__(self, *required_perms):

        available_perms = config['available_permissions']

        for perm in required_perms:

            if perm not in available_perms:

                raise Exception("'%s' permission is not defined" % perm)

        self.required_perms = set(required_perms)

        self.user_perms = None

    def __call__(self, func):

        return decorator(self.__wrapper, func)

    def __wrapper(self, func, *fargs, **fkwargs):

#        _wrapper.__name__ = func.__name__

#        _wrapper.__dict__.update(func.__dict__)

#        _wrapper.__doc__ = func.__doc__

        self.user_perms = session.get('hg_app_user', AuthUser()).permissions

        log.debug('checking %s permissions %s for %s',

           self.__class__.__name__, self.required_perms, func.__name__)

        if self.check_permissions():

            log.debug('Permission granted for %s', func.__name__)

            return func(*fargs, **fkwargs)

        else:

            log.warning('Permission denied for %s', func.__name__)

            #redirect with forbidden ret code

            return abort(403)

    def check_permissions(self):

        """Dummy function for overriding"""

        raise Exception('You have to write this function in child class')

class HasPermissionAllDecorator(PermsDecorator):

    """Checks for access permission for all given predicates. All of them 

    have to be meet in order to fulfill the request

    """

    def check_permissions(self):

        if self.required_perms.issubset(self.user_perms.get('global')):

            return True

        return False

class HasPermissionAnyDecorator(PermsDecorator):

    """Checks for access permission for any of given predicates. In order to 

    fulfill the request any of predicates must be meet

    """

    def check_permissions(self):

        if self.required_perms.intersection(self.user_perms.get('global')):

            return True

        return False

class HasRepoPermissionAllDecorator(PermsDecorator):

    """Checks for access permission for all given predicates for specific 

    repository. All of them have to be meet in order to fulfill the request

    """

    def check_permissions(self):

        repo_name = get_repo_slug(request)

        try:

            user_perms = set([self.user_perms['repositories'][repo_name]])

        except KeyError:

            return False

        if self.required_perms.issubset(user_perms):

            return True

        return False

class HasRepoPermissionAnyDecorator(PermsDecorator):

    """Checks for access permission for any of given predicates for specific 

    repository. In order to fulfill the request any of predicates must be meet

    """

    def check_permissions(self):

        repo_name = get_repo_slug(request)

        try:

            user_perms = set([self.user_perms['repositories'][repo_name]])

        except KeyError:

            return False

        if self.required_perms.intersection(user_perms):

            return True

        return False

#===============================================================================