import click
import time


class FakeClock(object):
    def __init__(self):
        self.now = time.time()

    def advance_time(self, seconds=1):
        self.now += seconds

    def time(self):
        return self.now


def test_progressbar_strip_regression(runner, monkeypatch):
    fake_clock = FakeClock()
    label = '    padded line'

    @click.command()
    def cli():
        with click.progressbar(tuple(range(10)), label=label) as progress:
            for thing in progress:
                fake_clock.advance_time()

    monkeypatch.setattr(time, 'time', fake_clock.time)
    monkeypatch.setattr(click._termui_impl, 'isatty', lambda _: True)
    assert label in runner.invoke(cli, []).output


def test_progressbar_length_hint(runner, monkeypatch):
    class Hinted(object):
        def __init__(self, n):
            self.items = list(range(n))

        def __length_hint__(self):
            return len(self.items)

        def __iter__(self):
            return self

        def __next__(self):
            if self.items:
                return self.items.pop()
            else:
                raise StopIteration

        next = __next__

    fake_clock = FakeClock()

    @click.command()
    def cli():
        with click.progressbar(Hinted(10), label='test') as progress:
            for thing in progress:
                fake_clock.advance_time()

    monkeypatch.setattr(time, 'time', fake_clock.time)
    monkeypatch.setattr(click._termui_impl, 'isatty', lambda _: True)
    result = runner.invoke(cli, [])
    assert result.exception is None


def test_progressbar_hidden(runner, monkeypatch):
    fake_clock = FakeClock()
    label = 'whatever'

    @click.command()
    def cli():
        with click.progressbar(tuple(range(10)), label=label) as progress:
            for thing in progress:
                fake_clock.advance_time()

    monkeypatch.setattr(time, 'time', fake_clock.time)
    monkeypatch.setattr(click._termui_impl, 'isatty', lambda _: False)
    assert runner.invoke(cli, []).output == ''


def test_choices_list_in_prompt(runner, monkeypatch):
    @click.command()
    @click.option('-g', type=click.Choice(['none', 'day', 'week', 'month']),
                  prompt=True)
    def cli_with_choices(g):
        pass

    @click.command()
    @click.option('-g', type=click.Choice(['none', 'day', 'week', 'month']),
                  prompt=True, show_choices=False)
    def cli_without_choices(g):
        pass

    result = runner.invoke(cli_with_choices, [], input='none')
    assert '(none, day, week, month)' in result.output

    result = runner.invoke(cli_without_choices, [], input='none')
    assert '(none, day, week, month)' not in result.output


def test_secho(runner):
    with runner.isolation() as outstreams:
        click.secho(None, nl=False)
        bytes = outstreams[0].getvalue()
        assert bytes == b''


def test_progressbar_yields_all_items(runner):
    with click.progressbar(range(3)) as progress:
        assert len(list(progress)) == 3


def test_progressbar_update(runner, monkeypatch):
    fake_clock = FakeClock()

    @click.command()
    def cli():
        with click.progressbar(range(4)) as progress:
            for _ in progress:
                fake_clock.advance_time()
                print("")

    monkeypatch.setattr(time, 'time', fake_clock.time)
    monkeypatch.setattr(click._termui_impl, 'isatty', lambda _: True)
    output = runner.invoke(cli, []).output

    lines = [line for line in output.split('\n') if '[' in line]

    assert ' 25%  00:00:03' in lines[0]
    assert ' 50%  00:00:02' in lines[1]
    assert ' 75%  00:00:01' in lines[2]
    assert '100%          ' in lines[3]