# vim: set fileencoding=utf-8 :

from . import context

import os
import shutil
import subprocess
import tarfile
import tempfile
# Try unittest2 for CentOS
try:
    import unittest2 as unittest
except ImportError:
    import unittest
import zipfile

import gbp.log
import gbp.deb.git
import gbp.errors
from gbp.deb.changelog import ChangeLog

class DebianGitTestRepo(unittest.TestCase):
    """Scratch repo for a single unit test"""

    def setUp(self):
        self.tmpdir = context.new_tmpdir(__name__)

        repodir = self.tmpdir.join('test_repo')
        self.repo = gbp.deb.git.DebianGitRepository.create(repodir)

    def tearDown(self):
        context.teardown()

    def add_file(self, name, content=None, msg=None):
        """
        Add a single file with name I{name} and content I{content}. If
        I{content} is C{none} the content of the file is undefined.

        @param name: the file's path relativ to the git repo
        @type name: C{str}
        @param content: the file's content
        @type content: C{str}
        """
        path = os.path.join(self.repo.path, name)

        d = os.path.dirname(path)
        if not os.path.exists(d):
            os.makedirs(d)

        with open(path, 'w+') as f:
            content == None or f.write(content)
        self.repo.add_files(name, force=True)
        self.repo.commit_files(path, msg or "added %s" % name)

class OsReleaseFile(object):
    """Repesents a simple file with key-value pairs"""

    def __init__(self, filename):
        self._values = {}

        try:
            with open(filename, 'r') as filed:
                for line in filed.readlines():
                    try:
                        key, value = line.split('=', 1)
                    except ValueError:
                        pass
                    else:
                        self._values[key] = value.strip()
        except IOError as err:
            gbp.log.info('Failed to read OS release file %s: %s' %
                            (filename, err))

    def __getitem__(self, key):
        if key in self._values:
            return self._values[key]
        return None

    def __contains__(self, key):
        return key in self._values

    def __str__(self):
        return str(self._values)

    def __repr__(self):
        return repr(self._values)

class MockedChangeLog(ChangeLog):
    contents = """foo (%s) experimental; urgency=low

  %s

 -- Debian Maintainer <maint@debian.org>  Sat, 01 Jan 2012 00:00:00 +0100"""

    def __init__(self, version, changes = "a important change"):
        ChangeLog.__init__(self,
                           contents=self.contents % (version, changes))


def get_dch_default_urgency():
    """Determine the default urgency level used by dch"""
    urgency = 'medium'
    tempdir = tempfile.mkdtemp()
    tmp_dch_name = os.path.join(tempdir, 'changelog')
    try:
        dch_cmd = ['dch', '--create', '--empty', '--changelog', tmp_dch_name,
                   '--package=foo', '--newversion=1',
                   '--distribution=UNRELEASED']
        ret = subprocess.Popen(dch_cmd).wait()
    except OSError:
        pass
    else:
        if ret == 0:
            with open(tmp_dch_name) as dchfile:
                header = dchfile.readline().strip()
                urgency = header.split()[-1].replace('urgency=', '')
    finally:
        if os.path.isdir(tempdir):
            shutil.rmtree(tempdir)
    return urgency

def ls_dir(directory, directories=True):
    """List the contents of directory, recurse to subdirectories"""
    contents = set()
    for root, dirs, files in os.walk(directory):
        prefix = ''
        if root != directory:
            prefix = os.path.relpath(root, directory) + '/'
        contents.update(['%s%s' % (prefix, fname) for fname in files])
        if directories:
            contents.update(['%s%s' % (prefix, dname) for dname in dirs])
    return contents

def ls_tar(tarball, directories=True):
    """List the contents of tar archive"""
    tmpdir = tempfile.mkdtemp()
    try:
        tarobj = tarfile.open(tarball, 'r')
        tarobj.extractall(tmpdir)
        return ls_dir(tmpdir, directories)
    finally:
        shutil.rmtree(tmpdir)

def ls_zip(archive, directories=True):
    """List the contents of zip file"""
    tmpdir = tempfile.mkdtemp()
    try:
        zipobj = zipfile.ZipFile(archive, 'r')
        zipobj.extractall(tmpdir)
        return ls_dir(tmpdir, directories)
    finally:
        shutil.rmtree(tmpdir)