import pytest
import click

from click.testing import CliRunner

from click._compat import PY2

# Use the most reasonable io that users would use for the python version.
if PY2:
    from cStringIO import StringIO as ReasonableBytesIO
else:
    from io import BytesIO as ReasonableBytesIO


def test_runner():
    @click.command()
    def test():
        i = click.get_binary_stream('stdin')
        o = click.get_binary_stream('stdout')
        while 1:
            chunk = i.read(4096)
            if not chunk:
                break
            o.write(chunk)
            o.flush()

    runner = CliRunner()
    result = runner.invoke(test, input='Hello World!\n')
    assert not result.exception
    assert result.output == 'Hello World!\n'

    runner = CliRunner(echo_stdin=True)
    result = runner.invoke(test, input='Hello World!\n')
    assert not result.exception
    assert result.output == 'Hello World!\nHello World!\n'


def test_runner_with_stream():
    @click.command()
    def test():
        i = click.get_binary_stream('stdin')
        o = click.get_binary_stream('stdout')
        while 1:
            chunk = i.read(4096)
            if not chunk:
                break
            o.write(chunk)
            o.flush()

    runner = CliRunner()
    result = runner.invoke(test, input=ReasonableBytesIO(b'Hello World!\n'))
    assert not result.exception
    assert result.output == 'Hello World!\n'

    runner = CliRunner(echo_stdin=True)
    result = runner.invoke(test, input=ReasonableBytesIO(b'Hello World!\n'))
    assert not result.exception
    assert result.output == 'Hello World!\nHello World!\n'


def test_prompts():
    @click.command()
    @click.option('--foo', prompt=True)
    def test(foo):
        click.echo('foo=%s' % foo)

    runner = CliRunner()
    result = runner.invoke(test, input='wau wau\n')
    assert not result.exception
    assert result.output == 'Foo: wau wau\nfoo=wau wau\n'

    @click.command()
    @click.option('--foo', prompt=True, hide_input=True)
    def test(foo):
        click.echo('foo=%s' % foo)

    runner = CliRunner()
    result = runner.invoke(test, input='wau wau\n')
    assert not result.exception
    assert result.output == 'Foo: \nfoo=wau wau\n'


def test_getchar():
    @click.command()
    def continue_it():
        click.echo(click.getchar())

    runner = CliRunner()
    result = runner.invoke(continue_it, input='y')
    assert not result.exception
    assert result.output == 'y\n'


def test_catch_exceptions():
    class CustomError(Exception):
        pass

    @click.command()
    def cli():
        raise CustomError(1)

    runner = CliRunner()

    result = runner.invoke(cli)
    assert isinstance(result.exception, CustomError)
    assert type(result.exc_info) is tuple
    assert len(result.exc_info) == 3

    with pytest.raises(CustomError):
        runner.invoke(cli, catch_exceptions=False)

    CustomError = SystemExit

    result = runner.invoke(cli)
    assert result.exit_code == 1


def test_with_color():
    @click.command()
    def cli():
        click.secho('hello world', fg='blue')

    runner = CliRunner()

    result = runner.invoke(cli)
    assert result.output == 'hello world\n'
    assert not result.exception

    result = runner.invoke(cli, color=True)
    assert result.output == click.style('hello world', fg='blue') + '\n'
    assert not result.exception


def test_with_color_but_pause_not_blocking():
    @click.command()
    def cli():
        click.pause()

    runner = CliRunner()
    result = runner.invoke(cli, color=True)
    assert not result.exception
    assert result.output == ''