#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#  This file is part of gns-deb-diff.
#
#  gns-deb-diff is under the Public Domain. See
#  <https://creativecommons.org/publicdomain/zero/1.0>

import os
import subprocess
import sys

from os import path
from shutil import rmtree

from nose.tools import *

from gd_diff import *


class TestGdDiff(object):

    def setup(self):
        """Setup method for this class."""
        self.pkgs_file = 'tests/files/parkes-pkgs.list'
        self.pkgs_file_ne = 'tests/nonexistent-file.list'
        self.gns_pkgs_dir = 'tests/gns-pkgs'
        self.stderr_orig = sys.stderr

    def test_read_file_success(self):
        f_content = read_file(self.pkgs_file)

        assert isinstance(f_content, str)
        assert_equal(len(f_content.split('\n')), 82)

    @raises(SystemExit)
    def test_read_file_error(self):
        with open(os.devnull, 'w') as sys.stderr:
            f_content = read_file(self.pkgs_file_ne)


    def test_execute_success(self):
        cmd = 'python --version'
        cp = execute(cmd, out=subprocess.PIPE)

        assert cp.returncode == 0
        assert cp.stdout.split()[0] == b'Python'
        assert cp.stdout.split()[1].startswith(b'3.5')

    def test_execute_cmderror(self):
        cmd = 'bzr cat bzr://bzr.sv.gnu.org/gnewsense/packages-parkes/nonexistent-packages/debian/README.gNewSense'
        cp = execute(cmd, err=subprocess.PIPE)

        assert cp.returncode == 3
        assert cp.stderr.startswith(b'bzr: ERROR:')


    @raises(SystemExit)
    def test_execute_raise_exception(self):
        cmd = 'cornhole computers'
        with open(os.devnull, 'w') as sys.stderr:
            cp = execute(cmd)


    def test_get_packages(self):
        pkgs_iter = get_packages(self.pkgs_file)
        assert len(list(pkgs_iter)) == 82

    def test_get_packages_sanity(self):
        pkgs_iter = get_packages(self.pkgs_file)

        for pkg in pkgs_iter:
            assert not ' ' in pkg

    def test_save_gns_readme(self):
        cmd = 'bzr cat bzr://bzr.sv.gnu.org/gnewsense/packages-parkes/antlr/debian/README.gNewSense'
        cp = execute(cmd, out=subprocess.PIPE)
        readme_content = cp.stdout

        # save it
        save_gns_readme(readme_content, 'parkes', 'antlr', self.gns_pkgs_dir)

        gns_readme_file = path.join(self.gns_pkgs_dir, 'parkes', 'antlr', 'debian', 'README.gNewSense')
        with open(gns_readme_file, 'rb') as f:
            assert f.read() == b'Changed-From-Debian: Removed example with non-free files.\nChange-Type: Modified\n\nFor gNewSense, the non-free unicode.IDENTs files are *actually* removed (see\nalso README.source). See gNewSense bug #34218 for details.\n'


    def test_save_gns_readme_double(self):
        cmd = 'bzr cat bzr://bzr.sv.gnu.org/gnewsense/packages-parkes/antlr/debian/README.gNewSense'
        cp = execute(cmd, out=subprocess.PIPE)
        readme_content = cp.stdout

        # save it twice
        save_gns_readme(readme_content, 'parkes', 'antlr', self.gns_pkgs_dir)
        save_gns_readme(readme_content, 'parkes', 'antlr', self.gns_pkgs_dir)

        gns_readme_file = path.join(self.gns_pkgs_dir, 'parkes', 'antlr', 'debian', 'README.gNewSense')
        with open(gns_readme_file, 'rb') as f:
            assert f.read() == b'Changed-From-Debian: Removed example with non-free files.\nChange-Type: Modified\n\nFor gNewSense, the non-free unicode.IDENTs files are *actually* removed (see\nalso README.source). See gNewSense bug #34218 for details.\n'

    @raises(SystemExit)
    def test_save_gns_readme_error(self):
        os.mkdir(self.gns_pkgs_dir, mode=0o500)

        # must error out
        readme_content = 'lorem ipsum'
        with open(os.devnull, 'w') as sys.stderr:
            save_gns_readme(readme_content, 'parkes', 'antlr', self.gns_pkgs_dir)


    def test_slurp_gns_readme_success(self):
        saved = slurp_gns_readme('parkes', 'antlr', self.gns_pkgs_dir)
        assert saved == True

        gns_readme_file = path.join(self.gns_pkgs_dir, 'parkes',
                                    'antlr', 'debian',
                                    'README.gNewSense')
        with open(gns_readme_file, 'rb') as f:
            assert f.read() == b'Changed-From-Debian: Removed example with non-free files.\nChange-Type: Modified\n\nFor gNewSense, the non-free unicode.IDENTs files are *actually* removed (see\nalso README.source). See gNewSense bug #34218 for details.\n'


    def test_slurp_gns_readme_error(self):
        saved = slurp_gns_readme('parkes', 'non-existent-pkg', self.gns_pkgs_dir)
        assert saved == False

        gns_readme_file = path.join(self.gns_pkgs_dir, 'parkes',
                                    'non-existent-pkg', 'debian',
                                    'README.gNewSense')
        assert not path.exists(gns_readme_file)


    def teardown(self):
        """Teardown method for this class."""
        if(path.exists(self.gns_pkgs_dir)):
            os.chmod(self.gns_pkgs_dir, mode=0o700)
            rmtree(self.gns_pkgs_dir)

        # restore sys.stderr
        sys.stderr = self.stderr_orig