import unittest
from logging import getLogger, Handler, DEBUG
import os

from conda import instructions
from conda.exports import execute_instructions
from conda.instructions import commands
from conda.exceptions import CondaFileIOError

try:
    from unittest.mock import patch
except ImportError:
    from mock import patch


def test_expected_operation_order():
    """Ensure expected order of operations"""
    expected = (
        instructions.CHECK_FETCH,
        instructions.FETCH,
        instructions.CHECK_EXTRACT,
        instructions.EXTRACT,
        instructions.UNLINK,
        instructions.LINK,
        instructions.SYMLINK_CONDA,
        instructions.RM_EXTRACTED,
        instructions.RM_FETCHED,
    )
    assert expected == instructions.ACTION_CODES


class LoggingTestHandler(Handler):
    def __init__(self):
        Handler.__init__(self)
        self.setLevel(DEBUG)
        self.records = []

    def handle(self, record):
        self.records.append((record.name, record.msg))


class TestExecutePlan(unittest.TestCase):

    def test_simple_instruction(self):

        index = {'This is an index': True}

        def simple_cmd(state, arg):
            simple_cmd.called = True
            simple_cmd.call_args = (arg,)

        commands['SIMPLE'] = simple_cmd

        plan = [('SIMPLE', ('arg1',))]

        execute_instructions(plan, index, verbose=False)

        self.assertTrue(simple_cmd.called)
        self.assertTrue(simple_cmd.call_args, ('arg1',))

    def test_state(self):

        index = {'This is an index': True}

        def simple_cmd(state, arg):
            expect, x = arg
            state.setdefault('x', 1)
            self.assertEqual(state['x'], expect)
            state['x'] = x
            simple_cmd.called = True

        commands['SIMPLE'] = simple_cmd

        plan = [('SIMPLE', (1, 5)),
                ('SIMPLE', (5, None)),
                ]

        execute_instructions(plan, index, verbose=False)
        self.assertTrue(simple_cmd.called)

    def test_check_files_in_tarball_files_exist(self):
        source_dir = os.getcwd()
        files = [__file__]
        self.assertTrue(instructions.check_files_in_package(source_dir, files))

    def test_check_files_in_tarball_files_not_exist(self):
        source_dir = os.getcwd()
        files = ["test-thing-that-does-not-exist"]
        try:
            instructions.check_files_in_package(source_dir, files)
        except CondaFileIOError as e:
            assert isinstance(e, CondaFileIOError)
        else:
            self.fail('CondaFileIOError not raised')


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