from unittest.mock import ANY, Mock
import pytest
from pytest_mock import MockerFixture
import headerparser
from headerparser import BOOL, HeaderParser, NormalizedDict


@pytest.fixture
def use_as_body() -> Mock:
    def _use(nd: NormalizedDict, _name: str, value: str) -> None:
        nd.body = value

    return Mock(side_effect=_use)


def test_action(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Foo: red\nBar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_missing(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Bar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    assert not stub.called


def test_action_type(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, type=BOOL)
    parser.add_field("Bar")
    msg = parser.parse("Foo: yes\nBar: green\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", True)


def test_action_type_error(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, type=BOOL)
    parser.add_field("Bar")
    with pytest.raises(headerparser.FieldTypeError):
        parser.parse("Foo: maybe\nBar: green\n")
    assert not stub.called


def test_action_required(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, required=True)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Foo: red\nBar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_required_missing(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, required=True)
    parser.add_field("Bar")
    parser.add_field("Baz")
    with pytest.raises(headerparser.MissingFieldError):
        parser.parse("Bar: green\nBaz: blue\n")
    assert not stub.called


def test_action_choices(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, choices=["red", "green", "blue"])
    parser.add_field("Bar")
    msg = parser.parse("Foo: red\nBar: green\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_bad_choice(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, choices=["red", "green", "blue"])
    parser.add_field("Bar")
    with pytest.raises(headerparser.InvalidChoiceError):
        parser.parse("Foo: taupe\nBar: green\n")
    assert not stub.called


def test_action_unfold(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, unfold=True)
    parser.add_field("Bar")
    msg = parser.parse("Foo:  folded\n  text \nBar: green\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "folded text")


def test_action_no_unfold(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub)
    parser.add_field("Bar")
    msg = parser.parse("Foo:  folded\n  text \nBar: green\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "folded\n  text ")


def test_action_default(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, default="orange")
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Foo: red\nBar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_default_missing(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, default="orange")
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Bar: green\nBaz: blue\n")
    assert dict(msg) == {"Foo": "orange", "Bar": "green", "Baz": "blue"}
    assert msg.body is None
    assert not stub.called


def test_action_different_case(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("FOO: red\nBar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_multiname(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", "Quux", action=stub)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("quux: red\nBar: green\nBaz: blue\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    stub.assert_called_once_with(msg, "Foo", "red")


def test_action_multiple(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo", action=stub, multiple=True)
    parser.add_field("Bar")
    parser.add_field("Baz")
    msg = parser.parse("Foo: red\nBar: green\nFOO: purple\nBaz: blue\nfoo: orange\n")
    assert dict(msg) == {"Bar": "green", "Baz": "blue"}
    assert msg.body is None
    assert stub.call_args_list == [
        mocker.call(msg, "Foo", "red"),
        mocker.call(msg, "Foo", "purple"),
        mocker.call(msg, "Foo", "orange"),
    ]


def test_action_dest(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    with pytest.raises(ValueError) as excinfo:
        parser.add_field("Foo", action=stub, dest="bar")
    assert "`action` and `dest` are mutually exclusive" in str(excinfo.value)
    assert not stub.called


def test_action_normalized_dest(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    with pytest.raises(ValueError) as excinfo:
        parser.add_field("Foo", action=stub, dest="foo")
    assert "`action` and `dest` are mutually exclusive" in str(excinfo.value)
    assert not stub.called


def test_action_additional(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo")
    parser.add_additional(action=stub)
    msg = parser.parse("Bar: green\nFoo: red\nBaz: blue\n")
    assert dict(msg) == {"Foo": "red"}
    assert msg.body is None
    assert stub.call_args_list == [
        mocker.call(msg, "Bar", "green"),
        mocker.call(msg, "Baz", "blue"),
    ]


def test_action_multiple_additional(mocker: MockerFixture) -> None:
    stub = mocker.stub()
    parser = HeaderParser()
    parser.add_field("Foo")
    parser.add_additional(action=stub, multiple=True)
    msg = parser.parse("Bar: green\nFoo: red\nBaz: blue\nbaz: mauve\nBAR: taupe\n")
    assert dict(msg) == {"Foo": "red"}
    assert msg.body is None
    assert stub.call_args_list == [
        mocker.call(msg, "Bar", "green"),
        mocker.call(msg, "Baz", "blue"),
        mocker.call(msg, "baz", "mauve"),
        mocker.call(msg, "BAR", "taupe"),
    ]


@pytest.mark.parametrize("body", [True, None])
def test_action_set_body_overwritten(body: bool, use_as_body: Mock) -> None:
    parser = HeaderParser(body=body)
    parser.add_field("Foo", action=use_as_body)
    parser.add_field("Bar")
    msg = parser.parse("Foo: red\nBar: green\n\nThis is the body.\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body == "This is the body.\n"
    use_as_body.assert_called_once_with(msg, "Foo", "red")


def test_action_set_body_forbidden(use_as_body: Mock) -> None:
    parser = HeaderParser(body=False)
    parser.add_field("Foo", action=use_as_body)
    parser.add_field("Bar")
    with pytest.raises(headerparser.BodyNotAllowedError):
        parser.parse("Foo: red\nBar: green\n\nThis is the body.\n")
    use_as_body.assert_called_once_with(ANY, "Foo", "red")


@pytest.mark.parametrize("body", [False, None])
def test_action_set_body(body: bool, use_as_body: Mock) -> None:
    parser = HeaderParser(body=body)
    parser.add_field("Foo", action=use_as_body)
    parser.add_field("Bar")
    msg = parser.parse("Foo: red\nBar: green\n")
    assert dict(msg) == {"Bar": "green"}
    assert msg.body == "red"
    use_as_body.assert_called_once_with(msg, "Foo", "red")


def test_action_set_body_missing(use_as_body: Mock) -> None:
    parser = HeaderParser(body=True)
    parser.add_field("Foo", action=use_as_body)
    parser.add_field("Bar")
    with pytest.raises(headerparser.MissingBodyError):
        parser.parse("Foo: red\nBar: green\n")
    use_as_body.assert_called_once_with(ANY, "Foo", "red")