import os
import pathlib
import stat
import sys
from io import StringIO

import pytest

import click._termui_impl
import click.utils
from click._compat import WIN


def test_echo(runner):
    with runner.isolation() as outstreams:
        click.echo("\N{SNOWMAN}")
        click.echo(b"\x44\x44")
        click.echo(42, nl=False)
        click.echo(b"a", nl=False)
        click.echo("\x1b[31mx\x1b[39m", nl=False)
        bytes = outstreams[0].getvalue().replace(b"\r\n", b"\n")
        assert bytes == b"\xe2\x98\x83\nDD\n42ax"

    # if wrapped, we expect bytes to survive.
    @click.command()
    def cli():
        click.echo(b"\xf6")

    result = runner.invoke(cli, [])
    assert result.stdout_bytes == b"\xf6\n"

    # Ensure we do not strip for bytes.
    with runner.isolation() as outstreams:
        click.echo(bytearray(b"\x1b[31mx\x1b[39m"), nl=False)
        assert outstreams[0].getvalue() == b"\x1b[31mx\x1b[39m"


def test_echo_custom_file():
    import io

    f = io.StringIO()
    click.echo("hello", file=f)
    assert f.getvalue() == "hello\n"


@pytest.mark.parametrize(
    ("styles", "ref"),
    [
        ({"fg": "black"}, "\x1b[30mx y\x1b[0m"),
        ({"fg": "red"}, "\x1b[31mx y\x1b[0m"),
        ({"fg": "green"}, "\x1b[32mx y\x1b[0m"),
        ({"fg": "yellow"}, "\x1b[33mx y\x1b[0m"),
        ({"fg": "blue"}, "\x1b[34mx y\x1b[0m"),
        ({"fg": "magenta"}, "\x1b[35mx y\x1b[0m"),
        ({"fg": "cyan"}, "\x1b[36mx y\x1b[0m"),
        ({"fg": "white"}, "\x1b[37mx y\x1b[0m"),
        ({"bg": "black"}, "\x1b[40mx y\x1b[0m"),
        ({"bg": "red"}, "\x1b[41mx y\x1b[0m"),
        ({"bg": "green"}, "\x1b[42mx y\x1b[0m"),
        ({"bg": "yellow"}, "\x1b[43mx y\x1b[0m"),
        ({"bg": "blue"}, "\x1b[44mx y\x1b[0m"),
        ({"bg": "magenta"}, "\x1b[45mx y\x1b[0m"),
        ({"bg": "cyan"}, "\x1b[46mx y\x1b[0m"),
        ({"bg": "white"}, "\x1b[47mx y\x1b[0m"),
        ({"bg": 91}, "\x1b[48;5;91mx y\x1b[0m"),
        ({"bg": (135, 0, 175)}, "\x1b[48;2;135;0;175mx y\x1b[0m"),
        ({"bold": True}, "\x1b[1mx y\x1b[0m"),
        ({"dim": True}, "\x1b[2mx y\x1b[0m"),
        ({"underline": True}, "\x1b[4mx y\x1b[0m"),
        ({"overline": True}, "\x1b[53mx y\x1b[0m"),
        ({"italic": True}, "\x1b[3mx y\x1b[0m"),
        ({"blink": True}, "\x1b[5mx y\x1b[0m"),
        ({"reverse": True}, "\x1b[7mx y\x1b[0m"),
        ({"strikethrough": True}, "\x1b[9mx y\x1b[0m"),
        ({"bold": False}, "\x1b[22mx y\x1b[0m"),
        ({"dim": False}, "\x1b[22mx y\x1b[0m"),
        ({"underline": False}, "\x1b[24mx y\x1b[0m"),
        ({"overline": False}, "\x1b[55mx y\x1b[0m"),
        ({"italic": False}, "\x1b[23mx y\x1b[0m"),
        ({"blink": False}, "\x1b[25mx y\x1b[0m"),
        ({"reverse": False}, "\x1b[27mx y\x1b[0m"),
        ({"strikethrough": False}, "\x1b[29mx y\x1b[0m"),
        ({"fg": "black", "reset": False}, "\x1b[30mx y"),
    ],
)
def test_styling(styles, ref):
    assert click.style("x y", **styles) == ref
    assert click.unstyle(ref) == "x y"


@pytest.mark.parametrize(("text", "expect"), [("\x1b[?25lx y\x1b[?25h", "x y")])
def test_unstyle_other_ansi(text, expect):
    assert click.unstyle(text) == expect


def test_filename_formatting():
    assert click.format_filename(b"foo.txt") == "foo.txt"
    assert click.format_filename(b"/x/foo.txt") == "/x/foo.txt"
    assert click.format_filename("/x/foo.txt") == "/x/foo.txt"
    assert click.format_filename("/x/foo.txt", shorten=True) == "foo.txt"

    # filesystem encoding on windows permits this.
    if not WIN:
        assert click.format_filename(b"/x/foo\xff.txt", shorten=True) == "foo\udcff.txt"


def test_prompts(runner):
    @click.command()
    def test():
        if click.confirm("Foo"):
            click.echo("yes!")
        else:
            click.echo("no :(")

    result = runner.invoke(test, input="y\n")
    assert not result.exception
    assert result.output == "Foo [y/N]: y\nyes!\n"

    result = runner.invoke(test, input="\n")
    assert not result.exception
    assert result.output == "Foo [y/N]: \nno :(\n"

    result = runner.invoke(test, input="n\n")
    assert not result.exception
    assert result.output == "Foo [y/N]: n\nno :(\n"

    @click.command()
    def test_no():
        if click.confirm("Foo", default=True):
            click.echo("yes!")
        else:
            click.echo("no :(")

    result = runner.invoke(test_no, input="y\n")
    assert not result.exception
    assert result.output == "Foo [Y/n]: y\nyes!\n"

    result = runner.invoke(test_no, input="\n")
    assert not result.exception
    assert result.output == "Foo [Y/n]: \nyes!\n"

    result = runner.invoke(test_no, input="n\n")
    assert not result.exception
    assert result.output == "Foo [Y/n]: n\nno :(\n"


def test_confirm_repeat(runner):
    cli = click.Command(
        "cli", params=[click.Option(["--a/--no-a"], default=None, prompt=True)]
    )
    result = runner.invoke(cli, input="\ny\n")
    assert result.output == "A [y/n]: \nError: invalid input\nA [y/n]: y\n"


@pytest.mark.skipif(WIN, reason="Different behavior on windows.")
def test_prompts_abort(monkeypatch, capsys):
    def f(_):
        raise KeyboardInterrupt()

    monkeypatch.setattr("click.termui.hidden_prompt_func", f)

    try:
        click.prompt("Password", hide_input=True)
    except click.Abort:
        click.echo("interrupted")

    out, err = capsys.readouterr()
    assert out == "Password:\ninterrupted\n"


def _test_gen_func():
    yield "a"
    yield "b"
    yield "c"
    yield "abc"


@pytest.mark.skipif(WIN, reason="Different behavior on windows.")
@pytest.mark.parametrize("cat", ["cat", "cat ", "cat "])
@pytest.mark.parametrize(
    "test",
    [
        # We need lambda here, because pytest will
        # reuse the parameters, and then the generators
        # are already used and will not yield anymore
        ("just text\n", lambda: "just text"),
        ("iterable\n", lambda: ["itera", "ble"]),
        ("abcabc\n", lambda: _test_gen_func),
        ("abcabc\n", lambda: _test_gen_func()),
        ("012345\n", lambda: (c for c in range(6))),
    ],
)
def test_echo_via_pager(monkeypatch, capfd, cat, test):
    monkeypatch.setitem(os.environ, "PAGER", cat)
    monkeypatch.setattr(click._termui_impl, "isatty", lambda x: True)

    expected_output = test[0]
    test_input = test[1]()

    click.echo_via_pager(test_input)

    out, err = capfd.readouterr()
    assert out == expected_output


@pytest.mark.skipif(WIN, reason="Test does not make sense on Windows.")
def test_echo_color_flag(monkeypatch, capfd):
    isatty = True
    monkeypatch.setattr(click._compat, "isatty", lambda x: isatty)

    text = "foo"
    styled_text = click.style(text, fg="red")
    assert styled_text == "\x1b[31mfoo\x1b[0m"

    click.echo(styled_text, color=False)
    out, err = capfd.readouterr()
    assert out == f"{text}\n"

    click.echo(styled_text, color=True)
    out, err = capfd.readouterr()
    assert out == f"{styled_text}\n"

    isatty = True
    click.echo(styled_text)
    out, err = capfd.readouterr()
    assert out == f"{styled_text}\n"

    isatty = False
    click.echo(styled_text)
    out, err = capfd.readouterr()
    assert out == f"{text}\n"


def test_prompt_cast_default(capfd, monkeypatch):
    monkeypatch.setattr(sys, "stdin", StringIO("\n"))
    value = click.prompt("value", default="100", type=int)
    capfd.readouterr()
    assert type(value) is int


@pytest.mark.skipif(WIN, reason="Test too complex to make work windows.")
def test_echo_writing_to_standard_error(capfd, monkeypatch):
    def emulate_input(text):
        """Emulate keyboard input."""
        monkeypatch.setattr(sys, "stdin", StringIO(text))

    click.echo("Echo to standard output")
    out, err = capfd.readouterr()
    assert out == "Echo to standard output\n"
    assert err == ""

    click.echo("Echo to standard error", err=True)
    out, err = capfd.readouterr()
    assert out == ""
    assert err == "Echo to standard error\n"

    emulate_input("asdlkj\n")
    click.prompt("Prompt to stdin")
    out, err = capfd.readouterr()
    assert out == "Prompt to stdin: "
    assert err == ""

    emulate_input("asdlkj\n")
    click.prompt("Prompt to stderr", err=True)
    out, err = capfd.readouterr()
    assert out == " "
    assert err == "Prompt to stderr:"

    emulate_input("y\n")
    click.confirm("Prompt to stdin")
    out, err = capfd.readouterr()
    assert out == "Prompt to stdin [y/N]: "
    assert err == ""

    emulate_input("y\n")
    click.confirm("Prompt to stderr", err=True)
    out, err = capfd.readouterr()
    assert out == " "
    assert err == "Prompt to stderr [y/N]:"

    monkeypatch.setattr(click.termui, "isatty", lambda x: True)
    monkeypatch.setattr(click.termui, "getchar", lambda: " ")

    click.pause("Pause to stdout")
    out, err = capfd.readouterr()
    assert out == "Pause to stdout\n"
    assert err == ""

    click.pause("Pause to stderr", err=True)
    out, err = capfd.readouterr()
    assert out == ""
    assert err == "Pause to stderr\n"


def test_echo_with_capsys(capsys):
    click.echo("Capture me.")
    out, err = capsys.readouterr()
    assert out == "Capture me.\n"


def test_open_file(runner):
    @click.command()
    @click.argument("filename")
    def cli(filename):
        with click.open_file(filename) as f:
            click.echo(f.read())

        click.echo("meep")

    with runner.isolated_filesystem():
        with open("hello.txt", "w") as f:
            f.write("Cool stuff")

        result = runner.invoke(cli, ["hello.txt"])
        assert result.exception is None
        assert result.output == "Cool stuff\nmeep\n"

        result = runner.invoke(cli, ["-"], input="foobar")
        assert result.exception is None
        assert result.output == "foobar\nmeep\n"


def test_open_file_pathlib_dash(runner):
    @click.command()
    @click.argument(
        "filename", type=click.Path(allow_dash=True, path_type=pathlib.Path)
    )
    def cli(filename):
        click.echo(str(type(filename)))

        with click.open_file(filename) as f:
            click.echo(f.read())

        result = runner.invoke(cli, ["-"], input="value")
        assert result.exception is None
        assert result.output == "pathlib.Path\nvalue\n"


def test_open_file_ignore_errors_stdin(runner):
    @click.command()
    @click.argument("filename")
    def cli(filename):
        with click.open_file(filename, errors="ignore") as f:
            click.echo(f.read())

    result = runner.invoke(cli, ["-"], input=os.urandom(16))
    assert result.exception is None


def test_open_file_respects_ignore(runner):
    with runner.isolated_filesystem():
        with open("test.txt", "w") as f:
            f.write("Hello world!")

        with click.open_file("test.txt", encoding="utf8", errors="ignore") as f:
            assert f.errors == "ignore"


def test_open_file_ignore_invalid_utf8(runner):
    with runner.isolated_filesystem():
        with open("test.txt", "wb") as f:
            f.write(b"\xe2\x28\xa1")

        with click.open_file("test.txt", encoding="utf8", errors="ignore") as f:
            f.read()


def test_open_file_ignore_no_encoding(runner):
    with runner.isolated_filesystem():
        with open("test.bin", "wb") as f:
            f.write(os.urandom(16))

        with click.open_file("test.bin", errors="ignore") as f:
            f.read()


@pytest.mark.skipif(WIN, reason="os.chmod() is not fully supported on Windows.")
@pytest.mark.parametrize("permissions", [0o400, 0o444, 0o600, 0o644])
def test_open_file_atomic_permissions_existing_file(runner, permissions):
    with runner.isolated_filesystem():
        with open("existing.txt", "w") as f:
            f.write("content")
        os.chmod("existing.txt", permissions)

        @click.command()
        @click.argument("filename")
        def cli(filename):
            click.open_file(filename, "w", atomic=True).close()

        result = runner.invoke(cli, ["existing.txt"])
        assert result.exception is None
        assert stat.S_IMODE(os.stat("existing.txt").st_mode) == permissions


@pytest.mark.skipif(WIN, reason="os.stat() is not fully supported on Windows.")
def test_open_file_atomic_permissions_new_file(runner):
    with runner.isolated_filesystem():

        @click.command()
        @click.argument("filename")
        def cli(filename):
            click.open_file(filename, "w", atomic=True).close()

        # Create a test file to get the expected permissions for new files
        # according to the current umask.
        with open("test.txt", "w"):
            pass
        permissions = stat.S_IMODE(os.stat("test.txt").st_mode)

        result = runner.invoke(cli, ["new.txt"])
        assert result.exception is None
        assert stat.S_IMODE(os.stat("new.txt").st_mode) == permissions


def test_iter_keepopenfile(tmpdir):
    expected = list(map(str, range(10)))
    p = tmpdir.mkdir("testdir").join("testfile")
    p.write("\n".join(expected))
    with p.open() as f:
        for e_line, a_line in zip(expected, click.utils.KeepOpenFile(f)):
            assert e_line == a_line.strip()


def test_iter_lazyfile(tmpdir):
    expected = list(map(str, range(10)))
    p = tmpdir.mkdir("testdir").join("testfile")
    p.write("\n".join(expected))
    with p.open() as f:
        with click.utils.LazyFile(f.name) as lf:
            for e_line, a_line in zip(expected, lf):
                assert e_line == a_line.strip()


class MockMain:
    __slots__ = "__package__"

    def __init__(self, package_name):
        self.__package__ = package_name


@pytest.mark.parametrize(
    ("path", "main", "expected"),
    [
        ("example.py", None, "example.py"),
        (str(pathlib.Path("/foo/bar/example.py")), None, "example.py"),
        ("example", None, "example"),
        (str(pathlib.Path("example/__main__.py")), "example", "python -m example"),
        (str(pathlib.Path("example/cli.py")), "example", "python -m example.cli"),
    ],
)
def test_detect_program_name(path, main, expected):
    assert click.utils._detect_program_name(path, _main=MockMain(main)) == expected


def test_expand_args(monkeypatch):
    user = os.path.expanduser("~")
    assert user in click.utils._expand_args(["~"])
    monkeypatch.setenv("CLICK_TEST", "hello")
    assert "hello" in click.utils._expand_args(["$CLICK_TEST"])
    assert "setup.cfg" in click.utils._expand_args(["*.cfg"])
    assert os.path.join("docs", "conf.py") in click.utils._expand_args(["**/conf.py"])
    assert "*.not-found" in click.utils._expand_args(["*.not-found"])
    # a bad glob pattern, such as a pytest identifier, should return itself
    assert click.utils._expand_args(["test.py::test_bad"])[0] == "test.py::test_bad"


@pytest.mark.parametrize(
    ("value", "max_length", "expect"),
    [
        pytest.param("", 10, "", id="empty"),
        pytest.param("123 567 90", 10, "123 567 90", id="equal length, no dot"),
        pytest.param("123 567 9. aaaa bbb", 10, "123 567 9.", id="sentence < max"),
        pytest.param("123 567\n\n 9. aaaa bbb", 10, "123 567", id="paragraph < max"),
        pytest.param("123 567 90123.", 10, "123 567...", id="truncate"),
        pytest.param("123 5678 xxxxxx", 10, "123...", id="length includes suffix"),
        pytest.param(
            "token in ~/.netrc ciao ciao",
            20,
            "token in ~/.netrc...",
            id="ignore dot in word",
        ),
    ],
)
@pytest.mark.parametrize(
    "alter",
    [
        pytest.param(None, id=""),
        pytest.param(
            lambda text: "\n\b\n" + "  ".join(text.split(" ")) + "\n", id="no-wrap mark"
        ),
    ],
)
def test_make_default_short_help(value, max_length, alter, expect):
    assert len(expect) <= max_length

    if alter:
        value = alter(value)

    out = click.utils.make_default_short_help(value, max_length)
    assert out == expect