/*

 * Copyright (c) 2021-2024, Sam Atkins <sam@ladybird.org>

 * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <LibJS/Runtime/VM.h>

#include <LibWeb/CSS/CSS.h>

#include <LibWeb/CSS/Parser/Parser.h>

#include <LibWeb/CSS/PropertyID.h>

#include <LibWeb/CSS/PropertyName.h>

#include <LibWeb/CSS/Serialize.h>

namespace Web::CSS {

// https://www.w3.org/TR/cssom-1/#dom-css-escape

WebIDL::ExceptionOr<String> escape(JS::VM&, StringView identifier)

{

    // The escape(ident) operation must return the result of invoking serialize an identifier of ident.

    return serialize_an_identifier(identifier);

}

// https://www.w3.org/TR/css-conditional-3/#dom-css-supports

bool supports(JS::VM& vm, StringView property, StringView value)

{

    auto& realm = *vm.current_realm();

    // 1. If property is an ASCII case-insensitive match for any defined CSS property that the UA supports,

    //    and value successfully parses according to that property’s grammar, return true.

    if (auto property_id = property_id_from_string(property); property_id.has_value()) {

        if (parse_css_value(Parser::ParsingContext { realm }, value, property_id.value()))

            return true;

    }

    // 2. Otherwise, if property is a custom property name string, return true.

    else if (is_a_custom_property_name_string(property)) {

        return true;

    }

    // 3. Otherwise, return false.

    return false;

}

// https://www.w3.org/TR/css-conditional-3/#dom-css-supports

WebIDL::ExceptionOr<bool> supports(JS::VM& vm, StringView condition_text)

{

    auto& realm = *vm.current_realm();

    // 1. If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.

    if (auto supports = parse_css_supports(Parser::ParsingContext { realm }, condition_text); supports && supports->matches())

        return true;

    // 2. Otherwise, If conditionText, wrapped in parentheses and then parsed and evaluated as a <supports-condition>, would return true, return true.

    auto wrapped_condition_text = TRY_OR_THROW_OOM(vm, String::formatted("({})", condition_text));

    if (auto supports = parse_css_supports(Parser::ParsingContext { realm }, wrapped_condition_text); supports && supports->matches())

        return true;

    // 3. Otherwise, return false.

    return false;

}

}