/*
 * Copyright (c) 2020-2021, the SerenityOS developers.
 * Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
 * Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/NonnullRefPtr.h>
#include <AK/RefPtr.h>
#include <LibWeb/CSS/Parser/Token.h>
#include <LibWeb/CSS/Parser/Types.h>
#include <LibWeb/Export.h>

namespace Web::CSS::Parser {

// https://drafts.csswg.org/css-syntax/#component-value
class WEB_API ComponentValue {
    AK_MAKE_DEFAULT_COPYABLE(ComponentValue);
    AK_MAKE_DEFAULT_MOVABLE(ComponentValue);

public:
    ComponentValue(Token);
    explicit ComponentValue(Function&&);
    explicit ComponentValue(SimpleBlock&&);
    explicit ComponentValue(GuaranteedInvalidValue&&);
    ~ComponentValue();

    bool is_block() const { return m_value.has<SimpleBlock>(); }
    SimpleBlock const& block() const { return m_value.get<SimpleBlock>(); }

    bool is_function() const { return m_value.has<Function>(); }
    bool is_function(StringView name) const;
    Function const& function() const { return m_value.get<Function>(); }

    bool is_token() const { return m_value.has<Token>(); }
    bool is(Token::Type type) const { return is_token() && token().is(type); }
    bool is_delim(u32 delim) const;
    bool is_ident(StringView ident) const;
    Token const& token() const { return m_value.get<Token>(); }
    operator Token() const { return m_value.get<Token>(); }

    bool is_guaranteed_invalid() const { return m_value.has<GuaranteedInvalidValue>(); }
    bool contains_guaranteed_invalid_value() const;
    bool contains_attr_tainted_value() const;
    void set_attr_tainted() { m_attr_tainted = true; }

    String to_string() const;
    String to_debug_string() const;
    String original_source_text() const;

    bool operator==(ComponentValue const&) const = default;

private:
    Variant<Token, Function, SimpleBlock, GuaranteedInvalidValue> m_value;
    bool m_attr_tainted { false };
};

}

template<>
struct AK::Formatter<Web::CSS::Parser::ComponentValue> : Formatter<StringView> {
    ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Parser::ComponentValue const& component_value)
    {
        return Formatter<StringView>::format(builder, component_value.to_string());
    }
};