# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
#    Copyright (C) 2010-2011 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 os, sys, imp
from os.path import join as opj
import itertools
import zipimport

import openerp

import openerp.osv as osv
import openerp.tools as tools
import openerp.tools.osutil as osutil
from openerp.tools.safe_eval import safe_eval as eval
from openerp.tools.translate import _

import openerp.netsvc as netsvc

import zipfile
import openerp.release as release

import re
import base64
from zipfile import PyZipFile, ZIP_DEFLATED
from cStringIO import StringIO

import logging

import openerp.modules.db
import openerp.modules.graph

_ad = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'addons') # default addons path (base)
ad_paths = []

# Modules already loaded
loaded = []

logger = netsvc.Logger()

def initialize_sys_path():
    """ Add all addons paths in sys.path.

    This ensures something like ``import crm`` works even if the addons are
    not in the PYTHONPATH.
    """
    global ad_paths

    if ad_paths:
        return

    ad_paths = map(lambda m: os.path.abspath(tools.ustr(m.strip())), tools.config['addons_path'].split(','))

    sys.path.insert(1, _ad)

    ad_cnt=1
    for adp in ad_paths:
        if adp != _ad:
            sys.path.insert(ad_cnt, adp)
            ad_cnt+=1

    ad_paths.append(_ad)    # for get_module_path


def get_module_path(module, downloaded=False):
    """Return the path of the given module.

    Search the addons paths and return the first path where the given
    module is found. If downloaded is True, return the default addons
    path if nothing else is found.

    """
    initialize_sys_path()
    for adp in ad_paths:
        if os.path.exists(opj(adp, module)) or os.path.exists(opj(adp, '%s.zip' % module)):
            return opj(adp, module)

    if downloaded:
        return opj(_ad, module)
    logger.notifyChannel('init', netsvc.LOG_WARNING, 'module %s: module not found' % (module,))
    return False


def get_module_filetree(module, dir='.'):
    path = get_module_path(module)
    if not path:
        return False

    dir = os.path.normpath(dir)
    if dir == '.':
        dir = ''
    if dir.startswith('..') or (dir and dir[0] == '/'):
        raise Exception('Cannot access file outside the module')

    if not os.path.isdir(path):
        # zipmodule
        zip = zipfile.ZipFile(path + ".zip")
        files = ['/'.join(f.split('/')[1:]) for f in zip.namelist()]
    else:
        files = osutil.listdir(path, True)

    tree = {}
    for f in files:
        if not f.startswith(dir):
            continue

        if dir:
            f = f[len(dir)+int(not dir.endswith('/')):]
        lst = f.split(os.sep)
        current = tree
        while len(lst) != 1:
            current = current.setdefault(lst.pop(0), {})
        current[lst.pop(0)] = None

    return tree

def zip_directory(directory, b64enc=True, src=True):
    """Compress a directory

    @param directory: The directory to compress
    @param base64enc: if True the function will encode the zip file with base64
    @param src: Integrate the source files

    @return: a string containing the zip file
    """

    RE_exclude = re.compile('(?:^\..+\.swp$)|(?:\.py[oc]$)|(?:\.bak$)|(?:\.~.~$)', re.I)

    def _zippy(archive, path, src=True):
        path = os.path.abspath(path)
        base = os.path.basename(path)
        for f in osutil.listdir(path, True):
            bf = os.path.basename(f)
            if not RE_exclude.search(bf) and (src or bf in ('__openerp__.py', '__terp__.py') or not bf.endswith('.py')):
                archive.write(os.path.join(path, f), os.path.join(base, f))

    archname = StringIO()
    archive = PyZipFile(archname, "w", ZIP_DEFLATED)

    # for Python 2.5, ZipFile.write() still expects 8-bit strings (2.6 converts to utf-8)
    directory = tools.ustr(directory).encode('utf-8')

    archive.writepy(directory)
    _zippy(archive, directory, src=src)
    archive.close()
    archive_data = archname.getvalue()
    archname.close()

    if b64enc:
        return base64.encodestring(archive_data)

    return archive_data

def get_module_as_zip(modulename, b64enc=True, src=True):
    """Generate a module as zip file with the source or not and can do a base64 encoding

    @param modulename: The module name
    @param b64enc: if True the function will encode the zip file with base64
    @param src: Integrate the source files

    @return: a stream to store in a file-like object
    """

    ap = get_module_path(str(modulename))
    if not ap:
        raise Exception('Unable to find path for module %s' % modulename)

    ap = ap.encode('utf8')
    if os.path.isfile(ap + '.zip'):
        val = file(ap + '.zip', 'rb').read()
        if b64enc:
            val = base64.encodestring(val)
    else:
        val = zip_directory(ap, b64enc, src)

    return val


def get_module_resource(module, *args):
    """Return the full path of a resource of the given module.

    @param module: the module
    @param args: the resource path components

    @return: absolute path to the resource

    TODO name it get_resource_path
    TODO make it available inside on osv object (self.get_resource_path)
    """
    a = get_module_path(module)
    if not a: return False
    resource_path = opj(a, *args)
    if zipfile.is_zipfile( a +'.zip') :
        zip = zipfile.ZipFile( a + ".zip")
        files = ['/'.join(f.split('/')[1:]) for f in zip.namelist()]
        resource_path = '/'.join(args)
        if resource_path in files:
            return opj(a, resource_path)
    elif os.path.exists(resource_path):
        return resource_path
    return False


def load_information_from_description_file(module):
    """
    :param module: The name of the module (sale, purchase, ...)
    """

    terp_file = get_module_resource(module, '__openerp__.py')
    if not terp_file:
        terp_file = get_module_resource(module, '__terp__.py')
    mod_path = get_module_path(module)
    if terp_file:
        info = {}
        if os.path.isfile(terp_file) or zipfile.is_zipfile(mod_path+'.zip'):
            terp_f = tools.file_open(terp_file)
            try:
                info = eval(terp_f.read())
            except Exception:
                logger.notifyChannel('modules', netsvc.LOG_ERROR,
                    'module %s: exception while evaluating file %s' %
                    (module, terp_file))
                raise
            finally:
                terp_f.close()
            # TODO the version should probably be mandatory
            info.setdefault('version', '0')
            info.setdefault('category', 'Uncategorized')
            info.setdefault('depends', [])
            info.setdefault('author', '')
            info.setdefault('website', '')
            info.setdefault('name', False)
            info.setdefault('description', '')
            info['certificate'] = info.get('certificate') or None
            info['web'] = info.get('web') or False
            info['license'] = info.get('license') or 'AGPL-3'
            info.setdefault('installable', True)
            info.setdefault('active', False)
            info.setdefault('wsgi', None) # WSGI entry point, given as a string
            for kind in ['data', 'demo', 'test',
                'init_xml', 'update_xml', 'demo_xml']:
                info.setdefault(kind, [])
            return info

    #TODO: refactor the logger in this file to follow the logging guidelines
    #      for 6.0
    logging.getLogger('modules').debug('module %s: no descriptor file'
        ' found: __openerp__.py or __terp__.py (deprecated)', module)
    return {}


def init_module_models(cr, module_name, obj_list):
    """ Initialize a list of models.

    Call _auto_init and init on each model to create or update the
    database tables supporting the models.

    TODO better explanation of _auto_init and init.

    """

    logger.notifyChannel('init', netsvc.LOG_INFO,
        'module %s: creating or updating database tables' % module_name)
    todo = []
    for obj in obj_list:
        result = obj._auto_init(cr, {'module': module_name})
        if result:
            todo += result
        if hasattr(obj, 'init'):
            obj.init(cr)
        cr.commit()
    for obj in obj_list:
        obj._auto_end(cr, {'module': module_name})
        cr.commit()
    todo.sort()
    for t in todo:
        t[1](cr, *t[2])
    cr.commit()

# Import hook to write a addon m in both sys.modules['m'] and
# sys.modules['openerp.addons.m']. Otherwise it could be loaded twice
# if imported twice using different names.
#class MyImportHook(object):
#    def find_module(self, module_name, package_path):
#       print ">>>", module_name, package_path
#    def load_module(self, module_name):
#       raise ImportError("Restricted")

#sys.meta_path.append(MyImportHook())

def register_module_classes(m):
    """ Register module named m, if not already registered.

    This loads the module and register all of its models, thanks to either
    the MetaModel metaclass, or the explicit instantiation of the model.

    """

    def log(e):
        mt = isinstance(e, zipimport.ZipImportError) and 'zip ' or ''
        msg = "Couldn't load %smodule %s" % (mt, m)
        logger.notifyChannel('init', netsvc.LOG_CRITICAL, msg)
        logger.notifyChannel('init', netsvc.LOG_CRITICAL, e)

    global loaded
    if m in loaded:
        return
    logger.notifyChannel('init', netsvc.LOG_INFO, 'module %s: registering objects' % m)
    mod_path = get_module_path(m)

    initialize_sys_path()
    try:
        zip_mod_path = mod_path + '.zip'
        if not os.path.isfile(zip_mod_path):
            __import__(m)
        else:
            zimp = zipimport.zipimporter(zip_mod_path)
            zimp.load_module(m)
    except Exception, e:
        log(e)
        raise
    else:
        loaded.append(m)


def get_modules():
    """Returns the list of module names
    """
    def listdir(dir):
        def clean(name):
            name = os.path.basename(name)
            if name[-4:] == '.zip':
                name = name[:-4]
            return name

        def is_really_module(name):
            name = opj(dir, name)
            return os.path.isdir(name) or zipfile.is_zipfile(name)
        return map(clean, filter(is_really_module, os.listdir(dir)))

    plist = []
    initialize_sys_path()
    for ad in ad_paths:
        plist.extend(listdir(ad))
    return list(set(plist))


def get_modules_with_version():
    modules = get_modules()
    res = {}
    for module in modules:
        try:
            info = load_information_from_description_file(module)
            res[module] = "%s.%s" % (release.major_version, info['version'])
        except Exception, e:
            continue
    return res


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