# Copyright (c) 2021, Nicola Coretti
# All rights reserved.
import inspect
import io
import unittest
from unittest.mock import (
    call,
    patch,
)

from crc._crc import main


class CliTests(unittest.TestCase):
    def test_cli_no_arguments_provided(self):
        expected_exit_code = -1
        argv = []
        with patch("sys.exit") as exit_mock:
            main(argv)
            self.assertTrue(exit_mock.called)
            self.assertEqual(exit_mock.call_args, (call(expected_exit_code)))

    def test_table_subcommand_with_no_additional_arguments(self):
        expected_exit_code = -1
        argv = ["table"]
        with patch("sys.exit") as exit_mock:
            main(argv)
            self.assertTrue(exit_mock.called)
            self.assertEqual(exit_mock.call_args, (call(expected_exit_code)))

    def test_table_generation_for_width_8_and_poly_0x1D(self):
        expected_output = io.StringIO(
            inspect.cleandoc(
                """
            0x00 0x1D 0x3A 0x27 0x74 0x69 0x4E 0x53
            0xE8 0xF5 0xD2 0xCF 0x9C 0x81 0xA6 0xBB
            0xCD 0xD0 0xF7 0xEA 0xB9 0xA4 0x83 0x9E
            0x25 0x38 0x1F 0x02 0x51 0x4C 0x6B 0x76
            0x87 0x9A 0xBD 0xA0 0xF3 0xEE 0xC9 0xD4
            0x6F 0x72 0x55 0x48 0x1B 0x06 0x21 0x3C
            0x4A 0x57 0x70 0x6D 0x3E 0x23 0x04 0x19
            0xA2 0xBF 0x98 0x85 0xD6 0xCB 0xEC 0xF1
            0x13 0x0E 0x29 0x34 0x67 0x7A 0x5D 0x40
            0xFB 0xE6 0xC1 0xDC 0x8F 0x92 0xB5 0xA8
            0xDE 0xC3 0xE4 0xF9 0xAA 0xB7 0x90 0x8D
            0x36 0x2B 0x0C 0x11 0x42 0x5F 0x78 0x65
            0x94 0x89 0xAE 0xB3 0xE0 0xFD 0xDA 0xC7
            0x7C 0x61 0x46 0x5B 0x08 0x15 0x32 0x2F
            0x59 0x44 0x63 0x7E 0x2D 0x30 0x17 0x0A
            0xB1 0xAC 0x8B 0x96 0xC5 0xD8 0xFF 0xE2
            0x26 0x3B 0x1C 0x01 0x52 0x4F 0x68 0x75
            0xCE 0xD3 0xF4 0xE9 0xBA 0xA7 0x80 0x9D
            0xEB 0xF6 0xD1 0xCC 0x9F 0x82 0xA5 0xB8
            0x03 0x1E 0x39 0x24 0x77 0x6A 0x4D 0x50
            0xA1 0xBC 0x9B 0x86 0xD5 0xC8 0xEF 0xF2
            0x49 0x54 0x73 0x6E 0x3D 0x20 0x07 0x1A
            0x6C 0x71 0x56 0x4B 0x18 0x05 0x22 0x3F
            0x84 0x99 0xBE 0xA3 0xF0 0xED 0xCA 0xD7
            0x35 0x28 0x0F 0x12 0x41 0x5C 0x7B 0x66
            0xDD 0xC0 0xE7 0xFA 0xA9 0xB4 0x93 0x8E
            0xF8 0xE5 0xC2 0xDF 0x8C 0x91 0xB6 0xAB
            0x10 0x0D 0x2A 0x37 0x64 0x79 0x5E 0x43
            0xB2 0xAF 0x88 0x95 0xC6 0xDB 0xFC 0xE1
            0x5A 0x47 0x60 0x7D 0x2E 0x33 0x14 0x09
            0x7F 0x62 0x45 0x58 0x0B 0x16 0x31 0x2C
            0x97 0x8A 0xAD 0xB0 0xE3 0xFE 0xD9 0xC4
        """
            )
            + "\n"
        )
        expected_exit_code = 0
        argv = ["table", "8", "0x1D"]
        with patch("sys.exit") as exit, patch(
            "sys.stdout", new_callable=io.StringIO
        ) as stdout:
            main(argv)

            stdout.seek(0)
            actual = stdout.read().split("\n")
            expected = expected_output.read().split("\n")

            self.assertEqual(expected, actual)
            self.assertEqual(exit.call_args, (call(expected_exit_code)))


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