# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2014 OpenERP S.A. (<http://openerp.com>).
#
#    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/>.
#
##############################################################################
from docutils import nodes
from docutils.core import publish_string
from docutils.transforms import Transform, writer_aux
from docutils.writers.html4css1 import Writer
import importlib
import logging
from operator import attrgetter
import os
import re
import shutil
import tempfile
import urllib
import urllib2
import urlparse
import zipfile
import zipimport
import lxml.html

try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO   # NOQA

import openerp
import openerp.exceptions
from openerp import modules, tools
from openerp.modules.db import create_categories
from openerp.modules import get_module_resource
from openerp.tools.parse_version import parse_version
from openerp.tools.translate import _
from openerp.osv import osv, orm, fields
from openerp import api, fields as fields2

_logger = logging.getLogger(__name__)

ACTION_DICT = {
    'view_type': 'form',
    'view_mode': 'form',
    'res_model': 'base.module.upgrade',
    'target': 'new',
    'type': 'ir.actions.act_window',
    'nodestroy': True,
}

def backup(path, raise_exception=True):
    path = os.path.normpath(path)
    if not os.path.exists(path):
        if not raise_exception:
            return None
        raise OSError('path does not exists')
    cnt = 1
    while True:
        bck = '%s~%d' % (path, cnt)
        if not os.path.exists(bck):
            shutil.move(path, bck)
            return bck
        cnt += 1


class module_category(osv.osv):
    _name = "ir.module.category"
    _description = "Application"

    def _module_nbr(self, cr, uid, ids, prop, unknow_none, context):
        cr.execute('SELECT category_id, COUNT(*) \
                      FROM ir_module_module \
                     WHERE category_id IN %(ids)s \
                        OR category_id IN (SELECT id \
                                             FROM ir_module_category \
                                            WHERE parent_id IN %(ids)s) \
                     GROUP BY category_id', {'ids': tuple(ids)}
                   )
        result = dict(cr.fetchall())
        for id in ids:
            cr.execute('select id from ir_module_category where parent_id=%s', (id,))
            result[id] = sum([result.get(c, 0) for (c,) in cr.fetchall()],
                             result.get(id, 0))
        return result

    _columns = {
        'name': fields.char("Name", required=True, translate=True, select=True),
        'parent_id': fields.many2one('ir.module.category', 'Parent Application', select=True),
        'child_ids': fields.one2many('ir.module.category', 'parent_id', 'Child Applications'),
        'module_nr': fields.function(_module_nbr, string='Number of Modules', type='integer'),
        'module_ids': fields.one2many('ir.module.module', 'category_id', 'Modules'),
        'description': fields.text("Description", translate=True),
        'sequence': fields.integer('Sequence'),
        'visible': fields.boolean('Visible'),
        'xml_id': fields.function(osv.osv.get_external_id, type='char', string="External ID"),
    }
    _order = 'name'

    _defaults = {
        'visible': 1,
    }

class MyFilterMessages(Transform):
    """
    Custom docutils transform to remove `system message` for a document and
    generate warnings.

    (The standard filter removes them based on some `report_level` passed in
    the `settings_override` dictionary, but if we use it, we can't see them
    and generate warnings.)
    """

    default_priority = 870

    def apply(self):
        for node in self.document.traverse(nodes.system_message):
            _logger.warning("docutils' system message present: %s", str(node))
            node.parent.remove(node)

class MyWriter(Writer):
    """
    Custom docutils html4ccs1 writer that doesn't add the warnings to the
    output document.
    """

    def get_transforms(self):
        return [MyFilterMessages, writer_aux.Admonitions]

class module(osv.osv):
    _name = "ir.module.module"
    _rec_name = "shortdesc"
    _description = "Module"

    def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=None, toolbar=False, submenu=False):
         res = super(module, self).fields_view_get(cr, uid, view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=False)
         result = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'base', 'action_server_module_immediate_install')[1]
         if view_type == 'form':
             if res.get('toolbar',False):
                 list = [rec for rec in res['toolbar']['action'] if rec.get('id', False) != result]
                 res['toolbar'] = {'action': list}
         return res

    @classmethod
    def get_module_info(cls, name):
        info = {}
        try:
            info = modules.load_information_from_description_file(name)
        except Exception:
            _logger.debug('Error when trying to fetch informations for '
                          'module %s', name, exc_info=True)
        return info

    def _get_desc(self, cr, uid, ids, field_name=None, arg=None, context=None):
        res = dict.fromkeys(ids, '')
        for module in self.browse(cr, uid, ids, context=context):
            path = get_module_resource(module.name, 'static/description/index.html')
            if path:
                with tools.file_open(path, 'rb') as desc_file:
                    doc = desc_file.read()
                    html = lxml.html.document_fromstring(doc)
                    for element, attribute, link, pos in html.iterlinks():
                        if element.get('src') and not '//' in element.get('src') and not 'static/' in element.get('src'):
                            element.set('src', "/%s/static/description/%s" % (module.name, element.get('src')))
                    res[module.id] = lxml.html.tostring(html)
            else:
                overrides = {
                    'embed_stylesheet': False,
                    'doctitle_xform': False,
                    'output_encoding': 'unicode',
                    'xml_declaration': False,
                }
                output = publish_string(source=module.description or '', settings_overrides=overrides, writer=MyWriter())
                res[module.id] = output
        return res

    def _get_latest_version(self, cr, uid, ids, field_name=None, arg=None, context=None):
        default_version = modules.adapt_version('1.0')
        res = dict.fromkeys(ids, default_version)
        for m in self.browse(cr, uid, ids):
            res[m.id] = self.get_module_info(m.name).get('version', default_version)
        return res

    def _get_views(self, cr, uid, ids, field_name=None, arg=None, context=None):
        res = {}
        model_data_obj = self.pool.get('ir.model.data')

        dmodels = []
        if field_name is None or 'views_by_module' in field_name:
            dmodels.append('ir.ui.view')
        if field_name is None or 'reports_by_module' in field_name:
            dmodels.append('ir.actions.report.xml')
        if field_name is None or 'menus_by_module' in field_name:
            dmodels.append('ir.ui.menu')
        assert dmodels, "no models for %s" % field_name

        for module_rec in self.browse(cr, uid, ids, context=context):
            res_mod_dic = res[module_rec.id] = {
                'menus_by_module': [],
                'reports_by_module': [],
                'views_by_module': []
            }

            # Skip uninstalled modules below, no data to find anyway.
            if module_rec.state not in ('installed', 'to upgrade', 'to remove'):
                continue

            # then, search and group ir.model.data records
            imd_models = dict([(m, []) for m in dmodels])
            imd_ids = model_data_obj.search(cr, uid, [
                ('module', '=', module_rec.name),
                ('model', 'in', tuple(dmodels))
            ])

            for imd_res in model_data_obj.read(cr, uid, imd_ids, ['model', 'res_id'], context=context):
                imd_models[imd_res['model']].append(imd_res['res_id'])

            def browse(model):
                M = self.pool[model]
                # as this method is called before the module update, some xmlid may be invalid at this stage
                # explictly filter records before reading them
                ids = M.exists(cr, uid, imd_models.get(model, []), context)
                return M.browse(cr, uid, ids, context)

            def format_view(v):
                aa = v.inherit_id and '* INHERIT ' or ''
                return '%s%s (%s)' % (aa, v.name, v.type)

            res_mod_dic['views_by_module'] = map(format_view, browse('ir.ui.view'))
            res_mod_dic['reports_by_module'] = map(attrgetter('name'), browse('ir.actions.report.xml'))
            res_mod_dic['menus_by_module'] = map(attrgetter('complete_name'), browse('ir.ui.menu'))

        for key in res.iterkeys():
            for k, v in res[key].iteritems():
                res[key][k] = "\n".join(sorted(v))
        return res

    def _get_icon_image(self, cr, uid, ids, field_name=None, arg=None, context=None):
        res = dict.fromkeys(ids, '')
        for module in self.browse(cr, uid, ids, context=context):
            path = get_module_resource(module.name, 'static', 'description', 'icon.png')
            if path:
                image_file = tools.file_open(path, 'rb')
                try:
                    res[module.id] = image_file.read().encode('base64')
                finally:
                    image_file.close()
        return res

    _columns = {
        'name': fields.char("Technical Name", readonly=True, required=True, select=True),
        'category_id': fields.many2one('ir.module.category', 'Category', readonly=True, select=True),
        'shortdesc': fields.char('Module Name', readonly=True, translate=True),
        'summary': fields.char('Summary', readonly=True, translate=True),
        'description': fields.text("Description", readonly=True, translate=True),
        'description_html': fields.function(_get_desc, string='Description HTML', type='html', method=True, readonly=True),
        'author': fields.char("Author", readonly=True),
        'maintainer': fields.char('Maintainer', readonly=True),
        'contributors': fields.text('Contributors', readonly=True),
        'website': fields.char("Website", readonly=True),

        # attention: Incorrect field names !!
        #   installed_version refers the latest version (the one on disk)
        #   latest_version refers the installed version (the one in database)
        #   published_version refers the version available on the repository
        'installed_version': fields.function(_get_latest_version, string='Latest Version', type='char'),
        'latest_version': fields.char('Installed Version', readonly=True),
        'published_version': fields.char('Published Version', readonly=True),

        'url': fields.char('URL', readonly=True),
        'sequence': fields.integer('Sequence'),
        'dependencies_id': fields.one2many('ir.module.module.dependency', 'module_id', 'Dependencies', readonly=True),
        'auto_install': fields.boolean('Automatic Installation',
                                       help='An auto-installable module is automatically installed by the '
                                            'system when all its dependencies are satisfied. '
                                            'If the module has no dependency, it is always installed.'),
        'state': fields.selection([
            ('uninstallable', 'Not Installable'),
            ('uninstalled', 'Not Installed'),
            ('installed', 'Installed'),
            ('to upgrade', 'To be upgraded'),
            ('to remove', 'To be removed'),
            ('to install', 'To be installed')
        ], string='Status', readonly=True, select=True),
        'demo': fields.boolean('Demo Data', readonly=True),
        'license': fields.selection([
            ('GPL-2', 'GPL Version 2'),
            ('GPL-2 or any later version', 'GPL-2 or later version'),
            ('GPL-3', 'GPL Version 3'),
            ('GPL-3 or any later version', 'GPL-3 or later version'),
            ('AGPL-3', 'Affero GPL-3'),
            ('LGPL-3', 'LGPL Version 3'),
            ('Other OSI approved licence', 'Other OSI Approved Licence'),
            ('Other proprietary', 'Other Proprietary')
        ], string='License', readonly=True),
        'menus_by_module': fields.function(_get_views, string='Menus', type='text', multi="meta", store=True),
        'reports_by_module': fields.function(_get_views, string='Reports', type='text', multi="meta", store=True),
        'views_by_module': fields.function(_get_views, string='Views', type='text', multi="meta", store=True),
        'application': fields.boolean('Application', readonly=True),
        'icon': fields.char('Icon URL'),
        'icon_image': fields.function(_get_icon_image, string='Icon', type="binary"),
    }

    _defaults = {
        'state': 'uninstalled',
        'sequence': 100,
        'demo': False,
        'license': 'AGPL-3',
    }
    _order = 'sequence,name'

    def _name_uniq_msg(self, cr, uid, ids, context=None):
        return _('The name of the module must be unique !')

    _sql_constraints = [
        ('name_uniq', 'UNIQUE (name)', _name_uniq_msg),
    ]

    def unlink(self, cr, uid, ids, context=None):
        if not ids:
            return True
        if isinstance(ids, (int, long)):
            ids = [ids]
        mod_names = []
        for mod in self.read(cr, uid, ids, ['state', 'name'], context):
            if mod['state'] in ('installed', 'to upgrade', 'to remove', 'to install'):
                raise orm.except_orm(_('Error'), _('You try to remove a module that is installed or will be installed'))
            mod_names.append(mod['name'])
        #Removing the entry from ir_model_data
        #ids_meta = self.pool.get('ir.model.data').search(cr, uid, [('name', '=', 'module_meta_information'), ('module', 'in', mod_names)])

        #if ids_meta:
        #    self.pool.get('ir.model.data').unlink(cr, uid, ids_meta, context)

        return super(module, self).unlink(cr, uid, ids, context=context)

    @staticmethod
    def _check_external_dependencies(terp):
        depends = terp.get('external_dependencies')
        if not depends:
            return
        for pydep in depends.get('python', []):
            try:
                importlib.import_module(pydep)
            except ImportError:
                raise ImportError('No module named %s' % (pydep,))

        for binary in depends.get('bin', []):
            if tools.find_in_path(binary) is None:
                raise Exception('Unable to find %r in path' % (binary,))

    @classmethod
    def check_external_dependencies(cls, module_name, newstate='to install'):
        terp = cls.get_module_info(module_name)
        try:
            cls._check_external_dependencies(terp)
        except Exception, e:
            if newstate == 'to install':
                msg = _('Unable to install module "%s" because an external dependency is not met: %s')
            elif newstate == 'to upgrade':
                msg = _('Unable to upgrade module "%s" because an external dependency is not met: %s')
            else:
                msg = _('Unable to process module "%s" because an external dependency is not met: %s')
            raise orm.except_orm(_('Error'), msg % (module_name, e.args[0]))

    @api.multi
    def state_update(self, newstate, states_to_update, level=100):
        if level < 1:
            raise orm.except_orm(_('Error'), _('Recursion error in modules dependencies !'))

        # whether some modules are installed with demo data
        demo = False

        for module in self:
            # determine dependency modules to update/others
            update_mods, ready_mods = self.browse(), self.browse()
            for dep in module.dependencies_id:
                if dep.state == 'unknown':
                    raise orm.except_orm(_('Error'), _("You try to install module '%s' that depends on module '%s'.\nBut the latter module is not available in your system.") % (module.name, dep.name,))
                if dep.depend_id.state == newstate:
                    ready_mods += dep.depend_id
                else:
                    update_mods += dep.depend_id

            # update dependency modules that require it, and determine demo for module
            update_demo = update_mods.state_update(newstate, states_to_update, level=level-1)
            module_demo = module.demo or update_demo or any(mod.demo for mod in ready_mods)
            demo = demo or module_demo

            # check dependencies and update module itself
            self.check_external_dependencies(module.name, newstate)
            if module.state in states_to_update:
                module.write({'state': newstate, 'demo': module_demo})

        return demo

    def button_install(self, cr, uid, ids, context=None):

        # Mark the given modules to be installed.
        self.state_update(cr, uid, ids, 'to install', ['uninstalled'], context=context)

        # Mark (recursively) the newly satisfied modules to also be installed

        # Select all auto-installable (but not yet installed) modules.
        domain = [('state', '=', 'uninstalled'), ('auto_install', '=', True)]
        uninstalled_ids = self.search(cr, uid, domain, context=context)
        uninstalled_modules = self.browse(cr, uid, uninstalled_ids, context=context)

        # Keep those with:
        #  - all dependencies satisfied (installed or to be installed),
        #  - at least one dependency being 'to install'
        satisfied_states = frozenset(('installed', 'to install', 'to upgrade'))
        def all_depencies_satisfied(m):
            states = set(d.state for d in m.dependencies_id)
            return states.issubset(satisfied_states) and ('to install' in states)
        to_install_modules = filter(all_depencies_satisfied, uninstalled_modules)
        to_install_ids = map(lambda m: m.id, to_install_modules)

        # Mark them to be installed.
        if to_install_ids:
            self.button_install(cr, uid, to_install_ids, context=context)

        return dict(ACTION_DICT, name=_('Install'))

    def button_immediate_install(self, cr, uid, ids, context=None):
        """ Installs the selected module(s) immediately and fully,
        returns the next res.config action to execute

        :param ids: identifiers of the modules to install
        :returns: next res.config item to execute
        :rtype: dict[str, object]
        """
        return self._button_immediate_function(cr, uid, ids, self.button_install, context=context)

    def button_install_cancel(self, cr, uid, ids, context=None):
        self.write(cr, uid, ids, {'state': 'uninstalled', 'demo': False})
        return True

    def module_uninstall(self, cr, uid, ids, context=None):
        """Perform the various steps required to uninstall a module completely
        including the deletion of all database structures created by the module:
        tables, columns, constraints, etc."""
        ir_model_data = self.pool.get('ir.model.data')
        modules_to_remove = [m.name for m in self.browse(cr, uid, ids, context)]
        ir_model_data._module_data_uninstall(cr, uid, modules_to_remove, context)
        self.write(cr, uid, ids, {'state': 'uninstalled', 'latest_version': False})
        return True

    def downstream_dependencies(self, cr, uid, ids, known_dep_ids=None,
                                exclude_states=['uninstalled', 'uninstallable', 'to remove'],
                                context=None):
        """Return the ids of all modules that directly or indirectly depend
        on the given module `ids`, and that satisfy the `exclude_states`
        filter"""
        if not ids:
            return []
        known_dep_ids = set(known_dep_ids or [])
        cr.execute('''SELECT DISTINCT m.id
                        FROM
                            ir_module_module_dependency d
                        JOIN
                            ir_module_module m ON (d.module_id=m.id)
                        WHERE
                            d.name IN (SELECT name from ir_module_module where id in %s) AND
                            m.state NOT IN %s AND
                            m.id NOT IN %s ''',
                   (tuple(ids), tuple(exclude_states), tuple(known_dep_ids or ids)))
        new_dep_ids = set([m[0] for m in cr.fetchall()])
        missing_mod_ids = new_dep_ids - known_dep_ids
        known_dep_ids |= new_dep_ids
        if missing_mod_ids:
            known_dep_ids |= set(self.downstream_dependencies(cr, uid, list(missing_mod_ids),
                                                              known_dep_ids, exclude_states, context))
        return list(known_dep_ids)

    def _button_immediate_function(self, cr, uid, ids, function, context=None):
        function(cr, uid, ids, context=context)

        cr.commit()
        api.Environment.reset()
        registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)

        config = registry['res.config'].next(cr, uid, [], context=context) or {}
        if config.get('type') not in ('ir.actions.act_window_close',):
            return config

        # reload the client; open the first available root menu
        menu_obj = registry['ir.ui.menu']
        menu_ids = menu_obj.search(cr, uid, [('parent_id', '=', False)], context=context)
        return {
            'type': 'ir.actions.client',
            'tag': 'reload',
            'params': {'menu_id': menu_ids and menu_ids[0] or False}
        }

    #TODO remove me in master, not called anymore
    def button_immediate_uninstall(self, cr, uid, ids, context=None):
        """
        Uninstall the selected module(s) immediately and fully,
        returns the next res.config action to execute
        """
        return self._button_immediate_function(cr, uid, ids, self.button_uninstall, context=context)

    def button_uninstall(self, cr, uid, ids, context=None):
        if any(m.name == 'base' for m in self.browse(cr, uid, ids, context=context)):
            raise orm.except_orm(_('Error'), _("The `base` module cannot be uninstalled"))
        dep_ids = self.downstream_dependencies(cr, uid, ids, context=context)
        self.write(cr, uid, ids + dep_ids, {'state': 'to remove'})
        return dict(ACTION_DICT, name=_('Uninstall'))

    def button_uninstall_cancel(self, cr, uid, ids, context=None):
        self.write(cr, uid, ids, {'state': 'installed'})
        return True

    def button_immediate_upgrade(self, cr, uid, ids, context=None):
        """
        Upgrade the selected module(s) immediately and fully,
        return the next res.config action to execute
        """
        return self._button_immediate_function(cr, uid, ids, self.button_upgrade, context=context)

    def button_upgrade(self, cr, uid, ids, context=None):
        depobj = self.pool.get('ir.module.module.dependency')
        todo = list(self.browse(cr, uid, ids, context=context))
        self.update_list(cr, uid)

        i = 0
        while i < len(todo):
            mod = todo[i]
            i += 1
            if mod.state not in ('installed', 'to upgrade'):
                raise orm.except_orm(_('Error'), _("Can not upgrade module '%s'. It is not installed.") % (mod.name,))
            self.check_external_dependencies(mod.name, 'to upgrade')
            iids = depobj.search(cr, uid, [('name', '=', mod.name)], context=context)
            for dep in depobj.browse(cr, uid, iids, context=context):
                if dep.module_id.state == 'installed' and dep.module_id not in todo:
                    todo.append(dep.module_id)

        ids = map(lambda x: x.id, todo)
        self.write(cr, uid, ids, {'state': 'to upgrade'}, context=context)

        to_install = []
        for mod in todo:
            for dep in mod.dependencies_id:
                if dep.state == 'unknown':
                    raise orm.except_orm(_('Error'), _('You try to upgrade a module that depends on the module: %s.\nBut this module is not available in your system.') % (dep.name,))
                if dep.state == 'uninstalled':
                    ids2 = self.search(cr, uid, [('name', '=', dep.name)])
                    to_install.extend(ids2)

        self.button_install(cr, uid, to_install, context=context)
        return dict(ACTION_DICT, name=_('Apply Schedule Upgrade'))

    def button_upgrade_cancel(self, cr, uid, ids, context=None):
        self.write(cr, uid, ids, {'state': 'installed'})
        return True

    def button_update_translations(self, cr, uid, ids, context=None):
        self.update_translations(cr, uid, ids)
        return True

    @staticmethod
    def get_values_from_terp(terp):
        return {
            'description': terp.get('description', ''),
            'shortdesc': terp.get('name', ''),
            'author': terp.get('author', 'Unknown'),
            'maintainer': terp.get('maintainer', False),
            'contributors': ', '.join(terp.get('contributors', [])) or False,
            'website': terp.get('website', ''),
            'license': terp.get('license', 'AGPL-3'),
            'sequence': terp.get('sequence', 100),
            'application': terp.get('application', False),
            'auto_install': terp.get('auto_install', False),
            'icon': terp.get('icon', False),
            'summary': terp.get('summary', ''),
        }


    def create(self, cr, uid, vals, context=None):
        new_id = super(module, self).create(cr, uid, vals, context=context)
        module_metadata = {
            'name': 'module_%s' % vals['name'],
            'model': 'ir.module.module',
            'module': 'base',
            'res_id': new_id,
            'noupdate': True,
        }
        self.pool['ir.model.data'].create(cr, uid, module_metadata)
        return new_id

    # update the list of available packages
    def update_list(self, cr, uid, context=None):
        res = [0, 0]    # [update, add]

        default_version = modules.adapt_version('1.0')
        known_mods = self.browse(cr, uid, self.search(cr, uid, []))
        known_mods_names = dict([(m.name, m) for m in known_mods])

        # iterate through detected modules and update/create them in db
        for mod_name in modules.get_modules():
            mod = known_mods_names.get(mod_name)
            terp = self.get_module_info(mod_name)
            values = self.get_values_from_terp(terp)

            if mod:
                updated_values = {}
                for key in values:
                    old = getattr(mod, key)
                    updated = isinstance(values[key], basestring) and tools.ustr(values[key]) or values[key]
                    if (old or updated) and updated != old:
                        updated_values[key] = values[key]
                if terp.get('installable', True) and mod.state == 'uninstallable':
                    updated_values['state'] = 'uninstalled'
                if parse_version(terp.get('version', default_version)) > parse_version(mod.latest_version or default_version):
                    res[0] += 1
                if updated_values:
                    self.write(cr, uid, mod.id, updated_values)
            else:
                mod_path = modules.get_module_path(mod_name)
                if not mod_path:
                    continue
                if not terp or not terp.get('installable', True):
                    continue
                id = self.create(cr, uid, dict(name=mod_name, state='uninstalled', **values))
                mod = self.browse(cr, uid, id)
                res[1] += 1

            self._update_dependencies(cr, uid, mod, terp.get('depends', []))
            self._update_category(cr, uid, mod, terp.get('category', 'Uncategorized'))

        # Trigger load_addons if new module have been discovered it exists on
        # wsgi handlers, so they can react accordingly
        if tuple(res) != (0, 0):
            for handler in openerp.service.wsgi_server.module_handlers:
                if hasattr(handler, 'load_addons'):
                    handler.load_addons()

        return res

    def download(self, cr, uid, ids, download=True, context=None):
        return []

    def install_from_urls(self, cr, uid, urls, context=None):
        if not self.pool['res.users'].has_group(cr, uid, 'base.group_system'):
            raise openerp.exceptions.AccessDenied()

        apps_server = urlparse.urlparse(self.get_apps_server(cr, uid, context=context))

        OPENERP = openerp.release.product_name.lower()
        tmp = tempfile.mkdtemp()
        _logger.debug('Install from url: %r', urls)
        try:
            # 1. Download & unzip missing modules
            for module_name, url in urls.items():
                if not url:
                    continue    # nothing to download, local version is already the last one

                up = urlparse.urlparse(url)
                if up.scheme != apps_server.scheme or up.netloc != apps_server.netloc:
                    raise openerp.exceptions.AccessDenied()

                try:
                    _logger.info('Downloading module `%s` from OpenERP Apps', module_name)
                    content = urllib2.urlopen(url).read()
                except Exception:
                    _logger.exception('Failed to fetch module %s', module_name)
                    raise osv.except_osv(_('Module not found'),
                                         _('The `%s` module appears to be unavailable at the moment, please try again later.') % module_name)
                else:
                    zipfile.ZipFile(StringIO(content)).extractall(tmp)
                    assert os.path.isdir(os.path.join(tmp, module_name))

            # 2a. Copy/Replace module source in addons path
            for module_name, url in urls.items():
                if module_name == OPENERP or not url:
                    continue    # OPENERP is special case, handled below, and no URL means local module
                module_path = modules.get_module_path(module_name, downloaded=True, display_warning=False)
                bck = backup(module_path, False)
                _logger.info('Copy downloaded module `%s` to `%s`', module_name, module_path)
                shutil.move(os.path.join(tmp, module_name), module_path)
                if bck:
                    shutil.rmtree(bck)

            # 2b.  Copy/Replace server+base module source if downloaded
            if urls.get(OPENERP, None):
                # special case. it contains the server and the base module.
                # extract path is not the same
                base_path = os.path.dirname(modules.get_module_path('base'))

                # copy all modules in the SERVER/openerp/addons directory to the new "openerp" module (except base itself)
                for d in os.listdir(base_path):
                    if d != 'base' and os.path.isdir(os.path.join(base_path, d)):
                        destdir = os.path.join(tmp, OPENERP, 'addons', d)    # XXX 'openerp' subdirectory ?
                        shutil.copytree(os.path.join(base_path, d), destdir)

                # then replace the server by the new "base" module
                server_dir = openerp.tools.config['root_path']      # XXX or dirname()
                bck = backup(server_dir)
                _logger.info('Copy downloaded module `openerp` to `%s`', server_dir)
                shutil.move(os.path.join(tmp, OPENERP), server_dir)
                #if bck:
                #    shutil.rmtree(bck)

            self.update_list(cr, uid, context=context)

            with_urls = [m for m, u in urls.items() if u]
            downloaded_ids = self.search(cr, uid, [('name', 'in', with_urls)], context=context)
            already_installed = self.search(cr, uid, [('id', 'in', downloaded_ids), ('state', '=', 'installed')], context=context)

            to_install_ids = self.search(cr, uid, [('name', 'in', urls.keys()), ('state', '=', 'uninstalled')], context=context)
            post_install_action = self.button_immediate_install(cr, uid, to_install_ids, context=context)

            if already_installed:
                # in this case, force server restart to reload python code...
                cr.commit()
                openerp.service.server.restart()
                return {
                    'type': 'ir.actions.client',
                    'tag': 'home',
                    'params': {'wait': True},
                }
            return post_install_action
        finally:
            shutil.rmtree(tmp)

    def get_apps_server(self, cr, uid, context=None):
        return tools.config.get('apps_server', 'https://apps.openerp.com/apps')

    def _update_dependencies(self, cr, uid, mod_browse, depends=None):
        if depends is None:
            depends = []
        existing = set(x.name for x in mod_browse.dependencies_id)
        needed = set(depends)
        for dep in (needed - existing):
            cr.execute('INSERT INTO ir_module_module_dependency (module_id, name) values (%s, %s)', (mod_browse.id, dep))
        for dep in (existing - needed):
            cr.execute('DELETE FROM ir_module_module_dependency WHERE module_id = %s and name = %s', (mod_browse.id, dep))
        self.invalidate_cache(cr, uid, ['dependencies_id'], [mod_browse.id])

    def _update_category(self, cr, uid, mod_browse, category='Uncategorized'):
        current_category = mod_browse.category_id
        current_category_path = []
        while current_category:
            current_category_path.insert(0, current_category.name)
            current_category = current_category.parent_id

        categs = category.split('/')
        if categs != current_category_path:
            cat_id = create_categories(cr, categs)
            mod_browse.write({'category_id': cat_id})

    def update_translations(self, cr, uid, ids, filter_lang=None, context=None):
        if not filter_lang:
            res_lang = self.pool.get('res.lang')
            lang_ids = res_lang.search(cr, uid, [('translatable', '=', True)])
            filter_lang = [lang.code for lang in res_lang.browse(cr, uid, lang_ids)]
        elif not isinstance(filter_lang, (list, tuple)):
            filter_lang = [filter_lang]
        modules = [m.name for m in self.browse(cr, uid, ids) if m.state == 'installed']
        self.pool.get('ir.translation').load_module_terms(cr, modules, filter_lang, context=context)

    def check(self, cr, uid, ids, context=None):
        for mod in self.browse(cr, uid, ids, context=context):
            if not mod.description:
                _logger.warning('module %s: description is empty !', mod.name)


DEP_STATES = [
    ('uninstallable', 'Uninstallable'),
    ('uninstalled', 'Not Installed'),
    ('installed', 'Installed'),
    ('to upgrade', 'To be upgraded'),
    ('to remove', 'To be removed'),
    ('to install', 'To be installed'),
    ('unknown', 'Unknown'),
]

class module_dependency(osv.Model):
    _name = "ir.module.module.dependency"
    _description = "Module dependency"

    # the dependency name
    name = fields2.Char(index=True)

    # the module that depends on it
    module_id = fields2.Many2one('ir.module.module', 'Module', ondelete='cascade')

    # the module corresponding to the dependency, and its status
    depend_id = fields2.Many2one('ir.module.module', 'Dependency', compute='_compute_depend')
    state = fields2.Selection(DEP_STATES, string='Status', compute='_compute_state')

    @api.multi
    @api.depends('name')
    def _compute_depend(self):
        # retrieve all modules corresponding to the dependency names
        names = list(set(dep.name for dep in self))
        mods = self.env['ir.module.module'].search([('name', 'in', names)])

        # index modules by name, and assign dependencies
        name_mod = dict((mod.name, mod) for mod in mods)
        for dep in self:
            dep.depend_id = name_mod.get(dep.name)

    @api.one
    @api.depends('depend_id.state')
    def _compute_state(self):
        self.state = self.depend_id.state or 'unknown'


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