from contextlib import nullcontext as does_not_raise
from typing import Any

import pytest

from textual.color import Color
from textual.css._help_renderables import HelpText
from textual.css.stylesheet import Stylesheet, StylesheetParseError
from textual.css.tokenizer import TokenizeError
from textual.dom import DOMNode


def test_stylesheet_apply_takes_final_rule_in_specificity_clash():
    css = ".a {background: red; color: lime} .b {background:blue}"
    stylesheet = Stylesheet()
    stylesheet.source["test.css"] = css
    stylesheet.parse()

    node = DOMNode(classes="a b")
    stylesheet.apply(node)

    assert node.styles.color == Color(0, 255, 0)  # color: lime
    assert node.styles.background == Color(0, 0, 255)  # background: blue


def test_stylesheet_apply_empty_rules():
    css = ".a {} .b {}"

    stylesheet = Stylesheet()
    stylesheet.source["test.css"] = css
    stylesheet.parse()

    node = DOMNode(classes="a b")
    stylesheet.apply(node)


@pytest.mark.parametrize(
    "css_value,expectation,expected_color",
    [
        # Valid values:
        ["transparent", does_not_raise(), Color(0, 0, 0, 0)],
        ["ansi_red", does_not_raise(), Color(128, 0, 0)],
        ["ansi_bright_magenta", does_not_raise(), Color(255, 0, 255)],
        ["red", does_not_raise(), Color(255, 0, 0)],
        ["lime", does_not_raise(), Color(0, 255, 0)],
        ["coral", does_not_raise(), Color(255, 127, 80)],
        ["aqua", does_not_raise(), Color(0, 255, 255)],
        ["deepskyblue", does_not_raise(), Color(0, 191, 255)],
        ["rebeccapurple", does_not_raise(), Color(102, 51, 153)],
        ["#ffcc00", does_not_raise(), Color(255, 204, 0)],
        ["#ffcc0033", does_not_raise(), Color(255, 204, 0, 0.2)],
        ["rgb(200,90,30)", does_not_raise(), Color(200, 90, 30)],
        ["rgba(200,90,30,0.3)", does_not_raise(), Color(200, 90, 30, 0.3)],
        # Some invalid ones:
        ["coffee", pytest.raises(StylesheetParseError), None],  # invalid color name
        ["ansi_dark_cyan", pytest.raises(StylesheetParseError), None],
        ["red 4", pytest.raises(StylesheetParseError), None],  # space in it
        ["1", pytest.raises(StylesheetParseError), None],  # invalid value
        ["()", pytest.raises(TokenizeError), None],  # invalid tokens
    ],
)
def test_color_property_parsing(css_value, expectation, expected_color):
    stylesheet = Stylesheet()
    css = """
    * {
      background: ${COLOR};
    }
    """.replace(
        "${COLOR}", css_value
    )

    with expectation:
        stylesheet.add_source(css)
        stylesheet.parse()

    if expected_color:
        css_rule = stylesheet.rules[0]
        assert css_rule.styles.background == expected_color


@pytest.mark.parametrize(
    "css_property_name,expected_property_name_suggestion",
    [
        ["backgroundu", "background"],
        ["bckgroundu", "background"],
        ["ofset-x", "offset-x"],
        ["ofst_y", "offset-y"],
        ["colr", "color"],
        ["colour", "color"],
        ["wdth", "width"],
        ["wth", "width"],
        ["wh", None],
        ["xkcd", None],
    ],
)
def test_did_you_mean_for_css_property_names(
    css_property_name: str, expected_property_name_suggestion
):
    stylesheet = Stylesheet()
    css = """
    * {
      border: blue;
      ${PROPERTY}: red;
    }
    """.replace(
        "${PROPERTY}", css_property_name
    )

    stylesheet.add_source(css)
    with pytest.raises(StylesheetParseError) as err:
        stylesheet.parse()

    _, help_text = err.value.errors.rules[0].errors[0]  # type: Any, HelpText
    displayed_css_property_name = css_property_name.replace("_", "-")
    expected_summary = f"Invalid CSS property [i]{displayed_css_property_name}[/]"
    if expected_property_name_suggestion:
        expected_summary += f'. Did you mean "{expected_property_name_suggestion}"?'
    assert help_text.summary == expected_summary


@pytest.mark.parametrize(
    "css_property_name,css_property_value,expected_color_suggestion",
    [
        ["color", "blu", "blue"],
        ["background", "chartruse", "chartreuse"],
        ["tint", "ansi_whi", "ansi_white"],
        ["scrollbar-color", "transprnt", "transparent"],
        ["color", "xkcd", None],
    ],
)
def test_did_you_mean_for_color_names(
    css_property_name: str, css_property_value: str, expected_color_suggestion
):
    stylesheet = Stylesheet()
    css = """
    * {
      border: blue;
      ${PROPERTY}: ${VALUE};
    }
    """.replace(
        "${PROPERTY}", css_property_name
    ).replace(
        "${VALUE}", css_property_value
    )

    stylesheet.add_source(css)
    with pytest.raises(StylesheetParseError) as err:
        stylesheet.parse()

    _, help_text = err.value.errors.rules[0].errors[0]  # type: Any, HelpText
    displayed_css_property_name = css_property_name.replace("_", "-")
    expected_error_summary = (
        f"Invalid value for the [i]{displayed_css_property_name}[/] property"
    )

    if expected_color_suggestion is not None:
        expected_error_summary += f'. Did you mean "{expected_color_suggestion}"?'

    assert help_text.summary == expected_error_summary