"""Test the Jupyter command-line"""

import json
import os
import sys
import sysconfig
from subprocess import check_output, CalledProcessError

import pytest
try:
    from unittest.mock import patch
except ImportError:
    # py2
    from mock import patch

from jupyter_core import __version__
from jupyter_core.command import list_subcommands
from jupyter_core.paths import (
    jupyter_config_dir, jupyter_data_dir, jupyter_runtime_dir,
    jupyter_path, jupyter_config_path,
)


def get_jupyter_output(cmd):
    """Get output of a jupyter command"""
    if not isinstance(cmd, list):
        cmd = [cmd]
    return check_output([sys.executable, '-m', 'jupyter_core'] + cmd).decode('utf8').strip()


def write_executable(path, source):
    if sys.platform == 'win32':
        script = path.dirpath() / path.purebasename + '-script.py'
        exe = path.dirpath() / path.purebasename + '.exe'
    else:
        script = path

    script.write(source)
    script.chmod(0o700)

    if sys.platform == 'win32':
        try:
            import pkg_resources
            w = pkg_resources.resource_string('setuptools', 'cli-32.exe')
        except (ImportError, FileNotFoundError):
            pytest.skip('Need pkg_resources/setuptools to make scripts executable on Windows')
        exe.write(w, 'wb')
        exe.chmod(0o700)


def assert_output(cmd, expected):
    assert get_jupyter_output(cmd) == expected


def test_config_dir():
    assert_output('--config-dir', jupyter_config_dir())


def test_data_dir():
    assert_output('--data-dir', jupyter_data_dir())


def test_runtime_dir():
    assert_output('--runtime-dir', jupyter_runtime_dir())


def test_paths():
    output = get_jupyter_output('--paths')
    for d in (jupyter_config_dir(), jupyter_data_dir(), jupyter_runtime_dir()):
        assert d in output
    for key in ('config', 'data', 'runtime'):
        assert ('%s:' % key) in output
    
    for path in (jupyter_config_path(), jupyter_path()):
        for d in path:
            assert d in output


def test_paths_json():
    output = get_jupyter_output(['--paths', '--json'])
    data = json.loads(output)
    assert sorted(data) == ['config', 'data', 'runtime']
    for key, path in data.items():
        assert isinstance(path, list)


def test_subcommand_not_given():
    with pytest.raises(CalledProcessError):
        get_jupyter_output([])


def test_help():
    output = get_jupyter_output('-h')


def test_subcommand_not_found():
    with pytest.raises(CalledProcessError):
        output = get_jupyter_output('nonexistant-subcommand')

@patch.object(sys, 'argv', [__file__] + sys.argv[1:])
def test_subcommand_list(tmpdir):
    a = tmpdir.mkdir("a")
    for cmd in ('jupyter-foo-bar',
                'jupyter-xyz',
                'jupyter-babel-fish'):
        a.join(cmd).write('')
    b = tmpdir.mkdir("b")
    for cmd in ('jupyter-foo',
                'jupyterstuff',
                'jupyter-yo-eyropa-ganymyde-callysto'):
        b.join(cmd).write('')
    c = tmpdir.mkdir("c")
    for cmd in ('jupyter-baz',
                'jupyter-bop'):
        c.join(cmd).write('')
    
    path = os.pathsep.join(map(str, [a, b]))

    def get_path(dummy):
        return str(c)
    
    with patch.object(sysconfig, 'get_path', get_path):
        with patch.dict('os.environ', {'PATH': path}):
            subcommands = list_subcommands()
            assert subcommands == [
                'babel-fish',
                'baz',
                'bop',
                'foo',
                'xyz',
                'yo-eyropa-ganymyde-callysto',
            ]

def test_not_on_path(tmpdir):
    a = tmpdir.mkdir("a")
    jupyter = a.join('jupyter')
    jupyter.write(
        'from jupyter_core import command; command.main()'
    )
    jupyter.chmod(0o700)
    witness = a.join('jupyter-witness')
    witness_src = '#!%s\n%s\n' % (sys.executable, 'print("WITNESS ME")')
    write_executable(witness, witness_src)

    env = {'PATH': ''}
    if 'SYSTEMROOT' in os.environ:  # Windows http://bugs.python.org/issue20614
        env[str('SYSTEMROOT')] = os.environ['SYSTEMROOT']
    if sys.platform == 'win32':
        env[str('PATHEXT')] = '.EXE'
    # This won't work on windows unless
    out = check_output([sys.executable, str(jupyter), 'witness'], env=env)
    assert b'WITNESS' in out


def test_path_priority(tmpdir):
    a = tmpdir.mkdir("a")
    jupyter = a.join('jupyter')
    jupyter.write(
        'from jupyter_core import command; command.main()'
    )
    jupyter.chmod(0o700)
    witness_a = a.join('jupyter-witness')
    witness_a_src = '#!%s\n%s\n' % (sys.executable, 'print("WITNESS A")')
    write_executable(witness_a, witness_a_src)

    b = tmpdir.mkdir("b")
    witness_b = b.join('jupyter-witness')
    witness_b_src = '#!%s\n%s\n' % (sys.executable, 'print("WITNESS B")')
    write_executable(witness_b, witness_b_src)

    env = {'PATH':  str(b)}
    if 'SYSTEMROOT' in os.environ:  # Windows http://bugs.python.org/issue20614
        env[str('SYSTEMROOT')] = os.environ['SYSTEMROOT']
    if sys.platform == 'win32':
        env[str('PATHEXT')] = '.EXE'
    out = check_output([sys.executable, str(jupyter), 'witness'], env=env)
    assert b'WITNESS A' in out
