/*

 * Copyright (c) 2021-2022, Tim Flynn <trflynn89@serenityos.org>

 *

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

 */

#pragma once

#include <AK/Optional.h>

#include <AK/String.h>

#include <AK/StringView.h>

#include <LibJS/Runtime/Object.h>

#include <LibLocale/Locale.h>

namespace JS::Intl {

class DisplayNames final : public Object {

    JS_OBJECT(DisplayNames, Object);

    JS_DECLARE_ALLOCATOR(DisplayNames);

    enum class Type {

        Invalid,

        Language,

        Region,

        Script,

        Currency,

        Calendar,

        DateTimeField,

    };

    enum class Fallback {

        Invalid,

        None,

        Code,

    };

    enum class LanguageDisplay {

        Dialect,

        Standard,

    };

public:

    virtual ~DisplayNames() override = default;

    String const& locale() const { return m_locale; }

    void set_locale(String locale) { m_locale = move(locale); }

    ::Locale::Style style() const { return m_style; }

    void set_style(StringView style) { m_style = ::Locale::style_from_string(style); }

    StringView style_string() const { return ::Locale::style_to_string(m_style); }

    Type type() const { return m_type; }

    void set_type(StringView type);

    StringView type_string() const;

    Fallback fallback() const { return m_fallback; }

    void set_fallback(StringView fallback);

    StringView fallback_string() const;

    bool has_language_display() const { return m_language_display.has_value(); }

    LanguageDisplay language_display() const { return *m_language_display; }

    void set_language_display(StringView language_display);

    StringView language_display_string() const;

private:

    DisplayNames(Object& prototype);

    String m_locale;                                   // [[Locale]]

    ::Locale::Style m_style { ::Locale::Style::Long }; // [[Style]]

    Type m_type { Type::Invalid };                     // [[Type]]

    Fallback m_fallback { Fallback::Invalid };         // [[Fallback]]

    Optional<LanguageDisplay> m_language_display {};   // [[LanguageDisplay]]

};

ThrowCompletionOr<Value> canonical_code_for_display_names(VM&, DisplayNames::Type, StringView code);

bool is_valid_date_time_field_code(StringView field);

}