import pytest

from textual.css.tokenize import tokenize
from textual.css.tokenizer import Token, TokenizeError

VALID_VARIABLE_NAMES = [
    "warning-text",
    "warning_text",
    "warningtext1",
    "1warningtext",
    "WarningText1",
    "warningtext_",
    "warningtext-",
    "_warningtext",
    "-warningtext",
]


@pytest.mark.parametrize("name", VALID_VARIABLE_NAMES)
def test_variable_declaration_valid_names(name):
    css = f"${name}: black on red;"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value=f'${name}:', path='', code=css, location=(0, 0), length=14),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 14), length=1),
        Token(name='token', value='black', path='', code=css, location=(0, 15), length=5),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 20), length=1),
        Token(name='token', value='on', path='', code=css, location=(0, 21), length=2),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 23), length=1),
        Token(name='token', value='red', path='', code=css, location=(0, 24), length=3),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 27), length=1),
    ]


def test_variable_declaration_multiple_values():
    css = "$x: 2vw\t4% 6s  red;"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='scalar', value='2vw', path='', code=css, location=(0, 4), length=3),
        Token(name='whitespace', value='\t', path='', code=css, location=(0, 7), length=0),
        Token(name='scalar', value='4%', path='', code=css, location=(0, 8), length=2),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 10), length=1),
        Token(name='duration', value='6s', path='', code=css, location=(0, 11), length=2),
        Token(name='whitespace', value='  ', path='', code=css, location=(0, 13), length=2),
        Token(name='token', value='red', path='', code=css, location=(0, 15), length=3),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 18), length=1),
    ]


def test_variable_declaration_comment_ignored():
    css = "$x: red; /* comment */"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='token', value='red', path='', code=css, location=(0, 4), length=3),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 7), length=1),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 8), length=1),
    ]


def test_variable_declaration_comment_interspersed_ignored():
    css = "$x: re/* comment */d;"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='token', value='re', path='', code=css, location=(0, 4), length=2),
        Token(name='token', value='d', path='', code=css, location=(0, 19), length=1),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 20), length=1),
    ]


def test_variable_declaration_no_semicolon():
    css = "$x: 1\n$y: 2"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='number', value='1', path='', code=css, location=(0, 4), length=1),
        Token(name='variable_value_end', value='\n', path='', code=css, location=(0, 5), length=1),
        Token(name='variable_name', value='$y:', path='', code=css, location=(1, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(1, 3), length=1),
        Token(name='number', value='2', path='', code=css, location=(1, 4), length=1),
    ]


def test_variable_declaration_invalid_value():
    css = "$x:(@$12x)"
    with pytest.raises(TokenizeError):
        list(tokenize(css, ""))


def test_variables_declarations_amongst_rulesets():
    css = "$x:1; .thing{text:red;} $y:2;"
    tokens = list(tokenize(css, ""))
    assert tokens == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='number', value='1', path='', code=css, location=(0, 3), length=1),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 4), length=1),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 5), length=1),
        Token(name='selector_start_class', value='.thing', path='', code=css, location=(0, 6), length=6),
        Token(name='declaration_set_start', value='{', path='', code=css, location=(0, 12), length=1),
        Token(name='declaration_name', value='text:', path='', code=css, location=(0, 13), length=5),
        Token(name='token', value='red', path='', code=css, location=(0, 18), length=3),
        Token(name='declaration_end', value=';', path='', code=css, location=(0, 21), length=1),
        Token(name='declaration_set_end', value='}', path='', code=css, location=(0, 22), length=1),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 23), length=1),
        Token(name='variable_name', value='$y:', path='', code=css, location=(0, 24), length=3),
        Token(name='number', value='2', path='', code=css, location=(0, 27), length=1),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 28), length=1),
    ]


def test_variables_reference_in_rule_declaration_value():
    css = ".warn{text: $warning;}"
    assert list(tokenize(css, "")) == [
        Token(name='selector_start_class', value='.warn', path='', code=css, location=(0, 0), length=5),
        Token(name='declaration_set_start', value='{', path='', code=css, location=(0, 5), length=1),
        Token(name='declaration_name', value='text:', path='', code=css, location=(0, 6), length=5),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 11), length=1),
        Token(name='variable_ref', value='$warning', path='', code=css, location=(0, 12), length=8),
        Token(name='declaration_end', value=';', path='', code=css, location=(0, 20), length=1),
        Token(name='declaration_set_end', value='}', path='', code=css, location=(0, 21), length=1),
    ]


def test_variables_reference_in_rule_declaration_value_multiple():
    css = ".card{padding: $pad-y $pad-x;}"
    assert list(tokenize(css, "")) == [
        Token(name='selector_start_class', value='.card', path='', code=css, location=(0, 0), length=5),
        Token(name='declaration_set_start', value='{', path='', code=css, location=(0, 5), length=1),
        Token(name='declaration_name', value='padding:', path='', code=css, location=(0, 6), length=8),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 14), length=1),
        Token(name='variable_ref', value='$pad-y', path='', code=css, location=(0, 15), length=6),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 21), length=1),
        Token(name='variable_ref', value='$pad-x', path='', code=css, location=(0, 22), length=6),
        Token(name='declaration_end', value=';', path='', code=css, location=(0, 28), length=1),
        Token(name='declaration_set_end', value='}', path='', code=css, location=(0, 29), length=1)
    ]


def test_variables_reference_in_variable_declaration():
    css = "$x: $y;"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='variable_ref', value='$y', path='', code=css, location=(0, 4), length=2),
        Token(name='variable_value_end', value=';', path='', code=css, location=(0, 6), length=1)
    ]


def test_variable_references_in_variable_declaration_multiple():
    css = "$x: $y  $z\n"
    assert list(tokenize(css, "")) == [
        Token(name='variable_name', value='$x:', path='', code=css, location=(0, 0), length=3),
        Token(name='whitespace', value=' ', path='', code=css, location=(0, 3), length=1),
        Token(name='variable_ref', value='$y', path='', code=css, location=(0, 4), length=2),
        Token(name='whitespace', value='  ', path='', code=css, location=(0, 6), length=2),
        Token(name='variable_ref', value='$z', path='', code=css, location=(0, 8), length=2),
        Token(name='variable_value_end', value='\n', path='', code=css, location=(0, 10), length=1)
    ]