#!/usr/bin/python
# Copyright (C) 2010, 2011  Lars Wirzenius
#
# 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, 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import cliapp
import os
import sys

import summainlib


class Summain(cliapp.Application):

    def add_settings(self):
        self.settings.boolean(['relative-paths', 'r'],
                              'print paths relative to arguments')
        self.settings.boolean(['mangle-paths', 'm'],
                              'mangle (obfuscate) paths')
        self.settings.string_list(['exclude'],
                              'do not output or compute FIELD',
                              metavar='FIELD')
        self.settings.string_list(['checksum', 'c'],
                                  'which checksums to compute: '
                                  'MD5, SHA1, SHA224, SHA256, SHA384, SHA512; '
                                  'use once per checksum type '
                                  '(default is SHA1)')

    def files(self, root):
        if os.path.isdir(root):
            for dirname, dirnames, filenames in os.walk(root):
                yield dirname
                dirname.sort()
                for filename in sorted(filenames):
                    yield os.path.join(dirname, filename)
        else:
            yield root

    def process_args(self, args):
        relative = self.settings['relative-paths']
        exclude = self.settings['exclude']
        nn = summainlib.NumberNormalizer()
        if self.settings['mangle-paths']:
            pn = summainlib.PathNormalizer()
        else:
            pn = summainlib.SamePath()
        checksums = [x.upper() 
                     for x in self.settings['checksum'] or ['SHA1']]
        o = summainlib.FilesystemObject('.', nn, pn, exclude, checksums)
        for checksum in checksums:
            try:
                o[checksum]
            except KeyError:
                raise cliapp.AppException('Unknown checksum %s' % checksum)
        for root in args:
            for filename in self.files(root):
                o = summainlib.FilesystemObject(filename, nn, pn, exclude,
                                                checksums)
                self.output.write(o.format(root if relative else None))
                self.output.write('\n')


Summain(version=summainlib.__version__).run()