import json
import os
import shutil
import subprocess
import sys
import unittest

from cpl_core.utils import String
from unittests_cli.constants import PLAYGROUND_PATH
from unittests_shared.cli_commands import CLICommands


class UpdateTestCase(unittest.TestCase):

    def __init__(self, methodName: str):
        unittest.TestCase.__init__(self, methodName)
        self._source = 'install-test-source'
        self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'

        self._old_version = '1.7.1'
        self._old_package_name = 'discord.py'
        self._old_package = f'{self._old_package_name}=={self._old_version}'

        # todo: better way to do shit required
        self._new_version = '2.0.1'
        self._new_package_name = 'discord.py'
        self._new_package = f'{self._new_package_name}=={self._new_version}'

    def _get_project_settings(self):
        with open(os.path.join(os.getcwd(), self._project_file), 'r', encoding='utf-8') as cfg:
            # load json
            project_json = json.load(cfg)
            cfg.close()

        return project_json

    def _save_project_settings(self, settings: dict):
        with open(os.path.join(os.getcwd(), self._project_file), 'w', encoding='utf-8') as project_file:
            project_file.write(json.dumps(settings, indent=2))
            project_file.close()

    def setUp(self):
        CLICommands.uninstall(self._old_package)
        CLICommands.uninstall(self._new_package)
        os.chdir(os.path.abspath(PLAYGROUND_PATH))
        # create projects
        CLICommands.new('console', self._source, '--ab', '--s')
        os.chdir(os.path.join(os.getcwd(), self._source))
        CLICommands.install(self._old_package)

    def cleanUp(self):
        # remove projects
        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
            return

        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))

    def _get_installed_packages(self) -> dict:
        reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze'])
        return dict([tuple(r.decode().split('==')) for r in reqs.split()])

    def test_install_package(self):
        settings = self._get_project_settings()
        self.assertNotEqual(settings, {})
        self.assertIn('ProjectSettings', settings)
        self.assertIn('Dependencies', settings['ProjectSettings'])
        self.assertIn(
            self._old_package,
            settings['ProjectSettings']['Dependencies']
        )
        packages = self._get_installed_packages()
        self.assertIn(self._old_package_name, packages)
        self.assertEqual(self._old_version, packages[self._old_package_name])

        CLICommands.update()

        settings = self._get_project_settings()
        self.assertNotEqual(settings, {})
        self.assertIn('ProjectSettings', settings)
        self.assertIn('Dependencies', settings['ProjectSettings'])
        self.assertIn(
            self._new_package,
            settings['ProjectSettings']['Dependencies']
        )
        packages = self._get_installed_packages()
        self.assertIn(self._new_package_name, packages)
        self.assertEqual(self._new_version, packages[self._new_package_name])