import os.path
import unittest
import traceback

import git
from click.testing import CliRunner

import yaclog.changelog
from yaclog.cli.__main__ import cli


def check_result(runner, result, success: bool = True):
    runner.assertEqual((result.exit_code == 0), success,
                       f'\noutput: {result.output}\ntraceback: ' + ''.join(
                           traceback.format_exception(*result.exc_info)))


class TestCreation(unittest.TestCase):
    def test_init(self):
        """Test creating and overwriting a changelog"""
        runner = CliRunner()
        location = 'CHANGELOG.md'
        err_str = 'THIS FILE WILL BE OVERWRITTEN'

        with runner.isolated_filesystem():
            result = runner.invoke(cli, ['init'])
            check_result(self, result)
            self.assertTrue(os.path.exists(os.path.abspath(location)), 'yaclog init did not create a file')
            self.assertIn(location, result.output, "yaclog init did not echo the file's correct location")

            with open(location, 'r') as fp:
                self.assertEqual('# Changelog\n', fp.readline())
                self.assertEqual('\n', fp.readline())
                self.assertEqual('All notable changes to this project will be documented in this file',
                                 fp.readline().rstrip())

            with open(location, 'w') as fp:
                fp.write(err_str)

            result = runner.invoke(cli, ['init'], input='y\n')
            check_result(self, result)
            self.assertTrue(os.path.exists(os.path.abspath(location)), 'file no longer exists after overwrite')
            self.assertIn(location, result.output, "yaclog init did not echo the file's correct location")

            with open(location, 'r') as fp:
                self.assertNotEqual(fp.read(), err_str, 'file was not overwritten')

    def test_init_path(self):
        """Test creating a changelog with a non-default filename"""
        runner = CliRunner()
        location = 'A different file.md'

        with runner.isolated_filesystem():
            result = runner.invoke(cli, ['--path', location, 'init'])
            check_result(self, result)
            self.assertTrue(os.path.exists(os.path.abspath(location)), 'yaclog init did not create a file')
            self.assertIn(location, result.output, "yaclog init did not echo the file's correct location")

    def test_does_not_exist(self):
        """Test if an error is thrown when the file does not exist"""
        runner = CliRunner()

        with runner.isolated_filesystem():
            result = runner.invoke(cli, ['show'])
            check_result(self, result, False)
            self.assertIn('does not exist', result.output)


class TestTagging(unittest.TestCase):
    def test_tag_addition(self):
        """Test adding tags to versions"""
        runner = CliRunner()
        location = 'CHANGELOG.md'

        with runner.isolated_filesystem():
            in_log = yaclog.Changelog(location)
            in_log.versions = [yaclog.changelog.VersionEntry(), yaclog.changelog.VersionEntry()]

            in_log.versions[0].name = '1.0.0'
            in_log.versions[1].name = '0.9.0'
            in_log.write()

            result = runner.invoke(cli, ['tag', 'tag1'])
            check_result(self, result)

            result = runner.invoke(cli, ['tag', 'tag2', '0.9.0'])
            check_result(self, result)

            out_log = yaclog.read(location)
            self.assertEqual(out_log.versions[0].tags, ['TAG1'])
            self.assertEqual(out_log.versions[1].tags, ['TAG2'])

            result = runner.invoke(cli, ['tag', 'tag3', '0.8.0'])
            check_result(self, result, False)

    def test_tag_deletion(self):
        """Test deleting tags from versions"""
        runner = CliRunner()
        location = 'CHANGELOG.md'

        with runner.isolated_filesystem():
            in_log = yaclog.Changelog(location)
            in_log.versions = [None, None]
            in_log.versions = [yaclog.changelog.VersionEntry(), yaclog.changelog.VersionEntry()]

            in_log.versions[0].name = '1.0.0'
            in_log.versions[0].tags = ['TAG1']

            in_log.versions[1].name = '0.9.0'
            in_log.versions[1].tags = ['TAG2']
            in_log.write()

            result = runner.invoke(cli, ['tag', '-d', 'tag2', '0.8.0'])
            check_result(self, result, False)

            result = runner.invoke(cli, ['tag', '-d', 'tag3', '0.9.0'])
            check_result(self, result, False)

            result = runner.invoke(cli, ['tag', '-d', 'tag1'])
            check_result(self, result)

            out_log = yaclog.read(location)
            self.assertEqual(out_log.versions[0].tags, [])
            self.assertEqual(out_log.versions[1].tags, ['TAG2'])

            result = runner.invoke(cli, ['tag', '-d', 'tag2', '0.9.0'])
            check_result(self, result)

            out_log = yaclog.read(location)
            self.assertEqual(out_log.versions[0].tags, [])
            self.assertEqual(out_log.versions[1].tags, [])


class TestRelease(unittest.TestCase):
    def test_increment(self):
        """Test version incrementing on release"""
        runner = CliRunner()
        location = 'CHANGELOG.md'

        with runner.isolated_filesystem():
            runner.invoke(cli, ['init'])  # create the changelog
            runner.invoke(cli, ['entry', '-b', 'entry number 1'])

            result = runner.invoke(cli, ['release', '1.0.0'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '1.0.0')
            self.assertIn('1.0.0', result.output)

            runner.invoke(cli, ['entry', '-b', 'entry number 2'])

            result = runner.invoke(cli, ['release', '-p'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '1.0.1')
            self.assertIn('1.0.1', result.output)

            runner.invoke(cli, ['entry', '-b', 'entry number 3'])

            result = runner.invoke(cli, ['release', '-m'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '1.1.0')
            self.assertIn('1.1.0', result.output)

            runner.invoke(cli, ['entry', '-b', 'entry number 4'])

            result = runner.invoke(cli, ['release', '-M'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '2.0.0')
            self.assertIn('2.0.0', result.output)

            runner.invoke(cli, ['entry', '-b', 'entry number 5'])

            result = runner.invoke(cli, ['release', '-Ma'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '3.0.0a1')
            self.assertIn('3.0.0a1', result.output)

            result = runner.invoke(cli, ['release', '-b'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '3.0.0b1')
            self.assertIn('3.0.0b1', result.output)

            result = runner.invoke(cli, ['release', '-r'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '3.0.0rc1')
            self.assertIn('3.0.0rc1', result.output)

            result = runner.invoke(cli, ['release', '-r'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '3.0.0rc2')
            self.assertIn('3.0.0rc1', result.output)

            result = runner.invoke(cli, ['release', '-f'])
            check_result(self, result)
            self.assertEqual(yaclog.read(location).versions[0].name, '3.0.0')
            self.assertIn('3.0.0', result.output)

    def test_commit(self):
        """Test committing and tagging releases"""
        runner = CliRunner()

        with runner.isolated_filesystem():
            repo = git.Repo.init(os.path.join(os.curdir, 'testing'))
            os.chdir('testing')
            repo.index.commit('initial commit')

            with repo.config_writer() as cw:
                cw.set_value('user', 'email', 'unit-tester@example.com')
                cw.set_value('user', 'name', 'unit-tester')

            runner.invoke(cli, ['init'])  # create the changelog
            runner.invoke(cli, ['entry', '-b', 'entry number 1'])

            result = runner.invoke(cli, ['release', 'Version 1.0.0', '-c'], input='y\n')
            check_result(self, result)
            self.assertIn('Created commit', result.output)
            self.assertIn('Created tag', result.output)
            self.assertIn(repo.head.commit.hexsha[0:7], result.output)
            self.assertEqual(repo.tags[0].name, '1.0.0')

    def test_cargo(self):
        """Test updating cargo.toml files"""
        runner = CliRunner()
        with runner.isolated_filesystem():
            with open("Cargo.toml", "w") as fp:
                fp.write((
                    '[package]\n'
                    'name = "dummy"\n'
                    'version = "0.3.4"\n'
                    'authors = ["Andrew Cassidy <drewcassidy@me.com>"]\n'
                    'description = "A dummy crate used for testing yaclog"\n'
                    'keywords = ["does", "not", "exist"]\n'
                    'edition = "2018"\n'
                ))

            runner.invoke(cli, ['init'])  # create the changelog
            runner.invoke(cli, ['entry', '-b', 'entry number 1'])

            result = runner.invoke(cli, ['release', 'Version 1.0.0', '-C'])
            check_result(self, result)

            with open("Cargo.toml", "r") as fp:
                self.assertIn('version = "1.0.0"', fp.read())
                # we're just going to trust tomlkit not to mangle everything else


class TestShow(unittest.TestCase):

    # noinspection PyShadowingNames
    def setUp(self):
        self.runner = CliRunner()
        self.location = 'CHANGELOG.md'

        self.log = yaclog.Changelog()

        self.log.add_version(name='1.0.0').add_entry('- entry number 1')
        self.log.add_version(name='Version 2.0.0').add_entry('- entry number 2', 'Added')
        self.log.add_version(name='Three Point Oh').add_entry('entry number 3')
        v = self.log.add_version(name='4.0.0 "Euclid"')
        v.add_entry('- entry number 4')
        v.add_entry('- entry number 5')
        v.tags.append('TAGGED')

        self.modes = {
            'full': ([], lambda v, k: v.text(**k), '\n\n'),
            'name': (['-n'], lambda v, k: v.name, '\n'),
            'body': (['-b'], lambda v, k: v.body(**k), '\n\n'),
            'header': (['-h'], lambda v, k: v.header(**k), '\n'),
        }

    def test_show_all(self):
        """Test showing all version information"""

        with self.runner.isolated_filesystem():
            self.log.write(self.location)

            for mode, t in self.modes.items():
                with self.subTest(mode, flags=t[0]):
                    check_result(self, result := self.runner.invoke(cli, ['show', '-a'] + t[0]))
                    self.assertEqual(t[2].join([t[1](v, {'md': False}) for v in self.log.versions]),
                                     result.output.strip(), 'incorrect plaintext output')

                    check_result(self, result := self.runner.invoke(cli, ['show', '-am'] + t[0]))
                    self.assertEqual(t[2].join([t[1](v, {'md': True}) for v in self.log.versions]),
                                     result.output.strip(), 'incorrect markdown output')

    def test_show_version(self):
        with self.runner.isolated_filesystem():
            self.log.write(self.location)

            for mode, t in self.modes.items():
                with self.subTest(mode, flags=t[0]):

                    for version in self.log.versions:
                        check_result(self, result := self.runner.invoke(cli, ['show', version.name] + t[0]))
                        self.assertEqual(t[1](version, {'md': False}),
                                         result.output.strip(), 'incorrect plaintext output')

                        check_result(self, result := self.runner.invoke(cli, ['show', version.name[-5:]] + t[0]))
                        self.assertEqual(t[1](version, {'md': False}),
                                         result.output.strip(), 'incorrect plaintext output')

                        check_result(self, result := self.runner.invoke(cli, ['show', version.name, '-m'] + t[0]))
                        self.assertEqual(t[1](version, {'md': True}),
                                         result.output.strip(), 'incorrect markdown output')

                        check_result(self, result := self.runner.invoke(cli, ['show', version.name[-5:], '-m'] + t[0]))
                        self.assertEqual(t[1](version, {'md': True}),
                                         result.output.strip(), 'incorrect markdown output')


if __name__ == '__main__':
    unittest.main()