# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
#    Copyright (C) 2010 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/>.
#
##############################################################################

import openerp.modules

def is_initialized(cr):
    """ Check if a database has been initialized for the ORM.

    The database can be initialized with the 'initialize' function below.

    """
    cr.execute("SELECT relname FROM pg_class WHERE relkind='r' AND relname='ir_module_module'")
    return len(cr.fetchall()) > 0

def initialize(cr):
    """ Initialize a database with for the ORM.

    This executes base/base.sql, creates the ir_module_categories (taken
    from each module descriptor file), and creates the ir_module_module
    and ir_model_data entries.

    """
    f = openerp.modules.get_module_resource('base', 'base.sql')
    base_sql_file = openerp.tools.misc.file_open(f)
    try:
        cr.execute(base_sql_file.read())
        cr.commit()
    finally:
        base_sql_file.close()

    for i in openerp.modules.get_modules():
        mod_path = openerp.modules.get_module_path(i)
        if not mod_path:
            continue

        # This will raise an exception if no/unreadable descriptor file.
        info = openerp.modules.load_information_from_description_file(i)

        if not info:
            continue
        categories = info['category'].split('/')
        category_id = create_categories(cr, categories)

        if info['installable']:
            if info['active']:
                state = 'to install'
            else:
                state = 'uninstalled'
        else:
            state = 'uninstallable'

        cr.execute('INSERT INTO ir_module_module \
                (author, website, name, shortdesc, description, \
                    category_id, state, certificate, web, license) \
                VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s) RETURNING id', (
            info['author'],
            info['website'], i, info['name'],
            info['description'], category_id, state, info['certificate'],
            info['web'],
            info['license']))
        id = cr.fetchone()[0]
        cr.execute('INSERT INTO ir_model_data \
            (name,model,module, res_id, noupdate) VALUES (%s,%s,%s,%s,%s)', (
                'module_meta_information', 'ir.module.module', i, id, True))
        dependencies = info['depends']
        for d in dependencies:
            cr.execute('INSERT INTO ir_module_module_dependency \
                    (module_id,name) VALUES (%s, %s)', (id, d))
        cr.commit()

def create_categories(cr, categories):
    """ Create the ir_module_category entries for some categories.

    categories is a list of strings forming a single category with its
    parent categories, like ['Grand Parent', 'Parent', 'Child'].

    Return the database id of the (last) category.

    """
    p_id = None
    while categories:
        if p_id is not None:
            cr.execute('SELECT id \
                       FROM ir_module_category \
                       WHERE name=%s AND parent_id=%s', (categories[0], p_id))
        else:
            cr.execute('SELECT id \
                       FROM ir_module_category \
                       WHERE name=%s AND parent_id IS NULL', (categories[0],))
        c_id = cr.fetchone()
        if not c_id:
            cr.execute('INSERT INTO ir_module_category \
                    (name, parent_id) \
                    VALUES (%s, %s) RETURNING id', (categories[0], p_id))
            c_id = cr.fetchone()[0]
        else:
            c_id = c_id[0]
        p_id = c_id
        categories = categories[1:]
    return p_id

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