# Fedora Developer Shell
#
# 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.
#
# 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# Authors: Yaakov M. Nemoy <ynemoy@redhat.com>
#

from __future__ import with_statement
import tarfile

from os import makedirs, getcwd, chdir, listdir
from shutil import copyfileobj, copytree
from os.path import abspath, join, split, splitext, basename, exists
from configobj import ConfigObj
from subprocess import Popen, PIPE
from urllib import urlretrieve

from base.module import Module
from base.base import log
from base.exceptions import ExecutionException
from base.util import pwd, copy
from base.profiles import ver_rel

#TODO: Find universal library for parsing URLs and PATHs alike

class Package(Module):
    def __init__(self, name=None):
        if not name:
            log.debug('no name with package')
            cwd = getcwd()
            log.debug(split(cwd))
            if self.is_dir_pkg(cwd):
                self.load_pkg(cwd)
            else:
                self.make_pkg(cwd)
            name = split(getcwd())[1]
            
            self.code_dir = getcwd()
            #detect name somehow
        else:
            log.debug('package.init with name ' + name)
            dir = abspath(name)
            if not exists(dir):
                makedirs(dir)
            if self.is_dir_pkg(dir):
                self.load_pkg(dir)
            else:
                self.make_pkg(dir)

    def is_dir_pkg(self, dir):
        with pwd(dir):
            cfg = ConfigObj('.devshell')
            try:
                if cfg['type'] == 'package':
                    log.debug('is type package')
                    return True
                else:
                    return False
            except KeyError, e:
                return False

    def load_pkg(self, dir):
        log.debug('package.load_pkg')
        with pwd(dir):
            self.cfg = ConfigObj('.devshell')
        self.name = self.cfg['name']
        self.code_dir = self.cfg['code_dir']

    def make_pkg(self, dir):
        log.debug('package.make_pkg')
        with pwd(dir):
            code_dir = dir
            name = split(getcwd())[1]
            self.cfg = ConfigObj('.devshell')
            self.cfg['type'] = 'package'
            self.cfg['name'] = self.name = name
            self.cfg['code_dir'] = self.code_dir = code_dir
            self.cfg.write()

    def add_spec(self, spec_file):
        log.debug('spec_file is %s' % spec_file)
        log.debug('spec_file_name is %s' % self.name + '.spec')
        with pwd(self.code_dir):
            try:
                copy(spec_file, self.name)
            except IOError, e:
                log.error(str(e))
                raise ExecutionException(e, 'spec-file could not be added')

    def orig_dir(self, dir):
        return dir + '_orig'

    def add_sourceball(self, sourceball_name, extract_dir=None):
        log.debug('addincg sourceball with code_dir ' + self.code_dir)
        with pwd(self.code_dir):
            try:
                sourceball_name = urlretrieve(sourceball_name, 
                                              split(sourceball_name)[1])[0]

                self.cfg['sourceball'] = sourceball_name
                sourceball = tarfile.open(sourceball_name)
                if not extract_dir:
                    extract_dir = min([(x.name, x) for x in sourceball])[0]
                    extract_dir = basename(abspath(extract_dir))
                log.debug('extract_dir is %s' % extract_dir)
                log.debug('config is of ' + str(self.cfg))
                self.cfg['source'] = extract_dir
                log.debug('cfg[\'source\'] is ' + self.cfg['source'])
                log.debug('set source')
                orig_extract_dir = self.orig_dir(extract_dir)
                sourceball.extractall()
                copytree(abspath(extract_dir), abspath(orig_extract_dir))
            except OSError, e:
                #TODO: Fill this in with something better
                #Chances are the _orig dir already exists
                raise ExecutionException(e, 'something went wrong')
                #TODO: figure out what exceptions TarFile will throw

    def close(self):
        log.debug('writing self.cfg for package')
        with pwd(self.code_dir):
            self.cfg.write()

    @property
    def spec_file(self):
        return self.name + '.spec'

    def get_srpm_name(self, profile):
        with pwd(self.code_dir):
            ver, rel = ver_rel(self.spec_file, profile.dist_defines())
            return '%s-%s-%s.src.rpm' % (self.name, ver, rel)


__all__ = ['Package']