# coding=utf-8
"""
Cmd2 functional testing based on transcript

Copyright 2016 Federico Ceratto <federico.ceratto@gmail.com>
Released under MIT license, see LICENSE file
"""
import argparse
import os
import sys
import re
import random

from unittest import mock
import pytest
import six

import cmd2
from cmd2 import Cmd, Cmd2TestCase, set_posix_shlex, set_strip_quotes
from conftest import run_cmd, StdOut, normalize

class CmdLineApp(Cmd):

    MUMBLES = ['like', '...', 'um', 'er', 'hmmm', 'ahh']
    MUMBLE_FIRST = ['so', 'like', 'well']
    MUMBLE_LAST = ['right?']

    def __init__(self, *args, **kwargs):
        self.multilineCommands = ['orate']
        self.maxrepeats = 3
        self.redirector = '->'

        # Add stuff to settable and/or shortcuts before calling base class initializer
        self.settable['maxrepeats'] = 'Max number of `--repeat`s allowed'

        super().__init__(*args, **kwargs)
        self.intro = 'This is an intro banner ...'

        # Configure how arguments are parsed for commands using decorators
        set_posix_shlex(False)
        set_strip_quotes(True)

    speak_parser = argparse.ArgumentParser()
    speak_parser.add_argument('-p', '--piglatin', action="store_true", help="atinLay")
    speak_parser.add_argument('-s', '--shout', action="store_true", help="N00B EMULATION MODE")
    speak_parser.add_argument('-r', '--repeat', type=int, help="output [n] times")

    @cmd2.with_argparser_and_unknown_args(speak_parser)
    def do_speak(self, opts, arg):
        """Repeats what you tell me to."""
        arg = ' '.join(arg)
        if opts.piglatin:
            arg = '%s%say' % (arg[1:], arg[0])
        if opts.shout:
            arg = arg.upper()
        repetitions = opts.repeat or 1
        for i in range(min(repetitions, self.maxrepeats)):
            self.poutput(arg)
            # recommend using the poutput function instead of
            # self.stdout.write or "print", because Cmd allows the user
            # to redirect output

    do_say = do_speak  # now "say" is a synonym for "speak"
    do_orate = do_speak  # another synonym, but this one takes multi-line input

    mumble_parser = argparse.ArgumentParser()
    mumble_parser.add_argument('-r', '--repeat', type=int, help="output [n] times")
    @cmd2.with_argparser_and_unknown_args(mumble_parser)
    def do_mumble(self, opts, arg):
        """Mumbles what you tell me to."""
        repetitions = opts.repeat or 1
        arg = arg.split()
        for i in range(min(repetitions, self.maxrepeats)):
            output = []
            if random.random() < .33:
                output.append(random.choice(self.MUMBLE_FIRST))
            for word in arg:
                if random.random() < .40:
                    output.append(random.choice(self.MUMBLES))
                output.append(word)
            if random.random() < .25:
                output.append(random.choice(self.MUMBLE_LAST))
            self.poutput(' '.join(output))


class DemoApp(Cmd):
    hello_parser = argparse.ArgumentParser()
    hello_parser.add_argument('-n', '--name', help="your name")
    @cmd2.with_argparser_and_unknown_args(hello_parser)
    def do_hello(self, opts, arg):
        """Says hello."""
        if opts.name:
            self.stdout.write('Hello {}\n'.format(opts.name))
        else:
            self.stdout.write('Hello Nobody\n')


@pytest.fixture
def _cmdline_app():
    c = CmdLineApp()
    c.stdout = StdOut()
    return c


@pytest.fixture
def _demo_app():
    c = DemoApp()
    c.stdout = StdOut()
    return c


def _get_transcript_blocks(transcript):
    cmd = None
    expected = ''
    for line in transcript.splitlines():
        if line.startswith('(Cmd) '):
            if cmd is not None:
                yield cmd, normalize(expected)

            cmd = line[6:]
            expected = ''
        else:
            expected += line + '\n'
    yield cmd, normalize(expected)


def test_base_with_transcript(_cmdline_app):
    app = _cmdline_app
    transcript = """
(Cmd) help

Documented commands (type help <topic>):
========================================
alias  help     load    orate  pyscript  say  shell      speak  
edit   history  mumble  py     quit      set  shortcuts  unalias

(Cmd) help say
usage: speak [-h] [-p] [-s] [-r REPEAT]

Repeats what you tell me to.

optional arguments:
  -h, --help            show this help message and exit
  -p, --piglatin        atinLay
  -s, --shout           N00B EMULATION MODE
  -r REPEAT, --repeat REPEAT
                        output [n] times

(Cmd) say goodnight, Gracie
goodnight, Gracie
(Cmd) say -ps --repeat=5 goodnight, Gracie
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
(Cmd) set maxrepeats 5
maxrepeats - was: 3
now: 5
(Cmd) say -ps --repeat=5 goodnight, Gracie
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
(Cmd) history
-------------------------[1]
help
-------------------------[2]
help say
-------------------------[3]
say goodnight, Gracie
-------------------------[4]
say -ps --repeat=5 goodnight, Gracie
-------------------------[5]
set maxrepeats 5
-------------------------[6]
say -ps --repeat=5 goodnight, Gracie
(Cmd) history -r 4
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
OODNIGHT, GRACIEGAY
(Cmd) set prompt "---> "
prompt - was: (Cmd)
now: --->
"""

    for cmd, expected in _get_transcript_blocks(transcript):
        out = run_cmd(app, cmd)
        assert out == expected


class TestMyAppCase(Cmd2TestCase):
    CmdApp = CmdLineApp
    CmdApp.testfiles = ['tests/transcript.txt']


def test_comment_stripping(_cmdline_app):
    out = run_cmd(_cmdline_app, 'speak it was /* not */ delicious! # Yuck!')
    expected = normalize("""it was delicious!""")
    assert out == expected


def test_argparser_correct_args_with_quotes_and_midline_options(_cmdline_app):
    out = run_cmd(_cmdline_app, "speak 'This is a' -s test of the emergency broadcast system!")
    expected = normalize("""THIS IS A TEST OF THE EMERGENCY BROADCAST SYSTEM!""")
    assert out == expected


def test_argparser_options_with_spaces_in_quotes(_demo_app):
    out = run_cmd(_demo_app, "hello foo -n 'Bugs Bunny' bar baz")
    expected = normalize("""Hello Bugs Bunny""")
    assert out == expected


def test_commands_at_invocation():
    testargs = ["prog", "say hello", "say Gracie", "quit"]
    expected = "This is an intro banner ...\nhello\nGracie\n"
    with mock.patch.object(sys, 'argv', testargs):
        app = CmdLineApp()
        app.stdout = StdOut()
        app.cmdloop()
        out = app.stdout.buffer
        assert out == expected

def test_invalid_syntax(_cmdline_app, capsys):
    run_cmd(_cmdline_app, 'speak "')
    out, err = capsys.readouterr()
    expected = normalize("""ERROR: Invalid syntax: No closing quotation""")
    assert normalize(str(err)) == expected


@pytest.mark.parametrize('filename, feedback_to_output', [
    ('bol_eol.txt', False),
    ('characterclass.txt', False),
    ('dotstar.txt', False),
    ('extension_notation.txt', False),
    # ('from_cmdloop.txt', True),
    ('multiline_no_regex.txt', False),
    ('multiline_regex.txt', False),
    ('regex_set.txt', False),
    ('singleslash.txt', False),
    ('slashes_escaped.txt', False),
    ('slashslash.txt', False),
    ('spaces.txt', False),
    # ('word_boundaries.txt', False),
    ])
def test_transcript(request, capsys, filename, feedback_to_output):
    # Create a cmd2.Cmd() instance and make sure basic settings are
    # like we want for test
    app = CmdLineApp()
    app.feedback_to_output = feedback_to_output

    # Get location of the transcript
    test_dir = os.path.dirname(request.module.__file__)
    transcript_file = os.path.join(test_dir, 'transcripts', filename)

    # Need to patch sys.argv so cmd2 doesn't think it was called with
    # arguments equal to the py.test args
    testargs = ['prog', '-t', transcript_file]
    with mock.patch.object(sys, 'argv', testargs):
        # Run the command loop
        app.cmdloop()

    # Check for the unittest "OK" condition for the 1 test which ran
    expected_start = ".\n----------------------------------------------------------------------\nRan 1 test in"
    expected_end = "s\n\nOK\n"
    out, err = capsys.readouterr()
    assert err.startswith(expected_start)
    assert err.endswith(expected_end)


@pytest.mark.parametrize('expected, transformed', [
    # strings with zero or one slash or with escaped slashes means no regular
    # expression present, so the result should just be what re.escape returns.
    # we don't use static strings in these tests because re.escape behaves
    # differently in python 3.7 than in prior versions
    ( 'text with no slashes', re.escape('text with no slashes') ),
    ( 'specials .*', re.escape('specials .*') ),
    ( 'use 2/3 cup', re.escape('use 2/3 cup') ),
    ( '/tmp is nice', re.escape('/tmp is nice') ),
    ( 'slash at end/', re.escape('slash at end/') ),
    # escaped slashes
    ( 'not this slash\/ or this one\/', re.escape('not this slash/ or this one/' ) ),
    # regexes
    ( '/.*/', '.*' ),
    ( 'specials ^ and + /[0-9]+/', re.escape('specials ^ and + ') + '[0-9]+' ),
    ( '/a{6}/ but not \/a{6} with /.*?/ more', 'a{6}' + re.escape(' but not /a{6} with ') + '.*?' + re.escape(' more') ),
    ( 'not \/, use /\|?/, not \/', re.escape('not /, use ') + '\|?' + re.escape(', not /') ),
    # inception: slashes in our regex. backslashed on input, bare on output
    ( 'not \/, use /\/?/, not \/', re.escape('not /, use ') + '/?' + re.escape(', not /') ),
    ( 'lots /\/?/ more /.*/ stuff', re.escape('lots ') + '/?' + re.escape(' more ') + '.*' + re.escape(' stuff') ),
    ])
def test_parse_transcript_expected(expected, transformed):
    app = CmdLineApp()

    class TestMyAppCase(Cmd2TestCase):
        cmdapp = app

    testcase = TestMyAppCase()
    assert testcase._transform_transcript_expected(expected) == transformed