/*
 * Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
 * Copyright (c) 2022-2024, Tim Flynn <trflynn89@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Intl/AbstractOperations.h>
#include <LibJS/Runtime/Intl/DurationFormat.h>
#include <LibJS/Runtime/Intl/DurationFormatConstructor.h>
#include <LibUnicode/DurationFormat.h>

namespace JS::Intl {

GC_DEFINE_ALLOCATOR(DurationFormatConstructor);

// 1.2 The Intl.DurationFormat Constructor, https://tc39.es/proposal-intl-duration-format/#sec-intl-durationformat-constructor
DurationFormatConstructor::DurationFormatConstructor(Realm& realm)
    : NativeFunction(realm.vm().names.DurationFormat.as_string(), realm.intrinsics().function_prototype())
{
}

void DurationFormatConstructor::initialize(Realm& realm)
{
    Base::initialize(realm);

    auto& vm = this->vm();

    // 1.3.1 Intl.DurationFormat.prototype, https://tc39.es/proposal-intl-duration-format/#sec-Intl.DurationFormat.prototype
    define_direct_property(vm.names.prototype, realm.intrinsics().intl_duration_format_prototype(), 0);
    define_direct_property(vm.names.length, Value(0), Attribute::Configurable);

    u8 attr = Attribute::Writable | Attribute::Configurable;
    define_native_function(realm, vm.names.supportedLocalesOf, supported_locales_of, 1, attr);
}

// 1.2.1 Intl.DurationFormat ( [ locales [ , options ] ] ), https://tc39.es/proposal-intl-duration-format/#sec-Intl.DurationFormat
ThrowCompletionOr<Value> DurationFormatConstructor::call()
{
    // 1. If NewTarget is undefined, throw a TypeError exception.
    return vm().throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, "Intl.DurationFormat");
}

// 1.2.1 Intl.DurationFormat ( [ locales [ , options ] ] ), https://tc39.es/proposal-intl-duration-format/#sec-Intl.DurationFormat
ThrowCompletionOr<GC::Ref<Object>> DurationFormatConstructor::construct(FunctionObject& new_target)
{
    auto& vm = this->vm();

    auto locales = vm.argument(0);
    auto options_value = vm.argument(1);

    // 2. Let durationFormat be ? OrdinaryCreateFromConstructor(NewTarget, "%DurationFormatPrototype%", « [[InitializedDurationFormat]], [[Locale]], [[DataLocale]], [[NumberingSystem]], [[Style]], [[YearsStyle]], [[YearsDisplay]], [[MonthsStyle]], [[MonthsDisplay]], [[WeeksStyle]], [[WeeksDisplay]], [[DaysStyle]], [[DaysDisplay]], [[HoursStyle]], [[HoursDisplay]], [[MinutesStyle]], [[MinutesDisplay]], [[SecondsStyle]], [[SecondsDisplay]], [[MillisecondsStyle]], [[MillisecondsDisplay]], [[MicrosecondsStyle]], [[MicrosecondsDisplay]], [[NanosecondsStyle]], [[NanosecondsDisplay]], [[HoursMinutesSeparator]], [[MinutesSecondsSeparator]], [[FractionalDigits]], [[TwoDigitHours]] »).
    auto duration_format = TRY(ordinary_create_from_constructor<DurationFormat>(vm, new_target, &Intrinsics::intl_duration_format_prototype));

    // 3. Let requestedLocales be ? CanonicalizeLocaleList(locales).
    auto requested_locales = TRY(canonicalize_locale_list(vm, locales));

    // 4. Let options be ? GetOptionsObject(options).
    auto options = TRY(Temporal::get_options_object(vm, options_value));

    // 5. Let matcher be ? GetOption(options, "localeMatcher", string, « "lookup", "best fit" », "best fit").
    auto matcher = TRY(get_option(vm, *options, vm.names.localeMatcher, OptionType::String, { "lookup"sv, "best fit"sv }, "best fit"sv));

    // 6. Let numberingSystem be ? GetOption(options, "numberingSystem", string, undefined, undefined).
    auto numbering_system = TRY(get_option(vm, *options, vm.names.numberingSystem, OptionType::String, {}, Empty {}));

    // 7. If numberingSystem is not undefined, then
    if (!numbering_system.is_undefined()) {
        // a. If numberingSystem does not match the Unicode Locale Identifier type nonterminal, throw a RangeError exception.
        if (!Unicode::is_type_identifier(numbering_system.as_string().utf8_string_view()))
            return vm.throw_completion<RangeError>(ErrorType::OptionIsNotValidValue, numbering_system, "numberingSystem"sv);
    }

    // 8. Let opt be the Record { [[localeMatcher]]: matcher, [[nu]]: numberingSystem }.
    LocaleOptions opt {};
    opt.locale_matcher = matcher;
    opt.nu = locale_key_from_value(numbering_system);

    // 9. Let r be ResolveLocale(%DurationFormat%.[[AvailableLocales]], requestedLocales, opt, %DurationFormat%.[[RelevantExtensionKeys]], %DurationFormat%.[[LocaleData]]).
    auto result = resolve_locale(requested_locales, opt, DurationFormat::relevant_extension_keys());

    // 10. Let locale be r.[[locale]].
    auto locale = move(result.locale);

    // 11. Set durationFormat.[[Locale]] to locale.
    duration_format->set_locale(move(locale));

    // 12. Set durationFormat.[[DataLocale]] to r.[[dataLocale]].
    // NOTE: The [[dataLocale]] internal slot no longer exists.

    // 13. Let dataLocale be durationFormat.[[DataLocale]].
    // 14. Let dataLocaleData be durationFormat.[[LocaleData]].[[<dataLocale>]].
    // 15. Let digitalFormat be dataLocaleData.[[DigitalFormat]].
    auto digital_format = Unicode::digital_format(duration_format->locale());

    // 16. Let twoDigitHours be digitalFormat.[[TwoDigitHours]].
    // 17. Set durationFormat.[[TwoDigitHours]] to twoDigitHours.
    duration_format->set_two_digit_hours(digital_format.uses_two_digit_hours);

    // 18. Let hoursMinutesSeparator be digitalFormat.[[HoursMinutesSeparator]].
    // 19. Set durationFormat.[[HoursMinutesSeparator]] to hoursMinutesSeparator.
    duration_format->set_hours_minutes_separator(move(digital_format.hours_minutes_separator));

    // 20. Let minutesSecondsSeparator be digitalFormat.[[MinutesSecondsSeparator]].
    // 21. Set durationFormat.[[MinutesSecondsSeparator]] to minutesSecondsSeparator.
    duration_format->set_minutes_seconds_separator(move(digital_format.minutes_seconds_separator));

    // 22. Set durationFormat.[[NumberingSystem]] to r.[[nu]].
    if (auto* resolved_numbering_system = result.nu.get_pointer<String>())
        duration_format->set_numbering_system(move(*resolved_numbering_system));

    // 23. Let style be ? GetOption(options, "style", string, « "long", "short", "narrow", "digital" », "short").
    auto style = TRY(get_option(vm, *options, vm.names.style, OptionType::String, { "long"sv, "short"sv, "narrow"sv, "digital"sv }, "short"sv));

    // 24. Set durationFormat.[[Style]] to style.
    duration_format->set_style(style.as_string().utf8_string_view());

    // 25. Let prevStyle be the empty String.
    String previous_style {};

    // 26. For each row of Table 3, except the header row, in table order, do
    for (auto const& duration_instances_component : duration_instances_components) {
        // a. Let styleSlot be the Style Slot value of the current row.
        auto style_slot = duration_instances_component.set_style_slot;

        // b. Let displaySlot be the Display Slot value of the current row.
        auto display_slot = duration_instances_component.set_display_slot;

        // c. Let unit be the Unit value of the current row.
        auto unit = MUST(String::from_utf8(duration_instances_component.unit));

        // d. Let valueList be the Values value of the current row.
        auto value_list = duration_instances_component.values;

        // e. Let digitalBase be the Digital Default value of the current row.
        auto digital_base = duration_instances_component.digital_default;

        // f. Let unitOptions be ? GetDurationUnitOptions(unit, options, style, valueList, digitalBase, prevStyle, twoDigitHours).
        auto unit_options = TRY(get_duration_unit_options(vm, unit, *options, duration_format->style_string(), value_list, digital_base, previous_style, duration_format->two_digit_hours()));

        // g. Set the value of the styleSlot slot of durationFormat to unitOptions.[[Style]].
        (duration_format->*style_slot)(unit_options.style);

        // h. Set the value of the displaySlot slot of durationFormat to unitOptions.[[Display]].
        (duration_format->*display_slot)(unit_options.display);

        // i. If unit is one of "hours", "minutes", "seconds", "milliseconds", or "microseconds", then
        if (unit.is_one_of("hours"sv, "minutes"sv, "seconds"sv, "milliseconds"sv, "microseconds"sv)) {
            // i. Set prevStyle to unitOptions.[[Style]].
            previous_style = move(unit_options.style);
        }
    }

    // 27. Set durationFormat.[[FractionalDigits]] to ? GetNumberOption(options, "fractionalDigits", 0, 9, undefined).
    duration_format->set_fractional_digits(Optional<u8>(TRY(get_number_option(vm, *options, vm.names.fractionalDigits, 0, 9, {}))));

    // 28. Return durationFormat.
    return duration_format;
}

// 1.3.2 Intl.DurationFormat.supportedLocalesOf ( locales [ , options ] ), https://tc39.es/proposal-intl-duration-format/#sec-Intl.DurationFormat.supportedLocalesOf
JS_DEFINE_NATIVE_FUNCTION(DurationFormatConstructor::supported_locales_of)
{
    auto locales = vm.argument(0);
    auto options = vm.argument(1);

    // 1. Let availableLocales be %DurationFormat%.[[AvailableLocales]].

    // 2. Let requestedLocales be ? CanonicalizeLocaleList(locales).
    auto requested_locales = TRY(canonicalize_locale_list(vm, locales));

    // 3. Return ? FilterLocales(availableLocales, requestedLocales, options).
    return TRY(filter_locales(vm, requested_locales, options));
}

}