/*
 * Copyright (c) 2022, Idan Horowitz <idan.horowitz@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>

namespace JS::Intl {

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

void DurationFormatConstructor::initialize(Realm& realm)
{
    NativeFunction::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.global_object().intl_duration_format_prototype(), 0);
    define_direct_property(vm.names.length, Value(0), Attribute::Configurable);

    u8 attr = Attribute::Writable | Attribute::Configurable;
    define_native_function(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<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]], [[FractionalDigits]] »).
    auto* duration_format = TRY(ordinary_create_from_constructor<DurationFormat>(vm, new_target, &GlobalObject::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 {}));

    // FIXME: Missing spec step - If numberingSystem is not undefined, then
    if (!numbering_system.is_undefined()) {
        // 7. If numberingSystem does not match the Unicode Locale Identifier type nonterminal, throw a RangeError exception.
        if (numbering_system.is_undefined() || !Unicode::is_type_identifier(numbering_system.as_string().string()))
            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 = numbering_system.is_undefined() ? Optional<String>() : numbering_system.as_string().string();

    // 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.[[NumberingSystem]] to r.[[nu]].
    if (result.nu.has_value())
        duration_format->set_numbering_system(result.nu.release_value());

    // 13. Let style be ? GetOption(options, "style", "string", « "long", "short", "narrow", "digital" », "long").
    auto style = TRY(get_option(vm, *options, vm.names.style, OptionType::String, { "long"sv, "short"sv, "narrow"sv, "digital"sv }, "long"sv));

    // 14. Set durationFormat.[[Style]] to style.
    duration_format->set_style(style.as_string().string());

    // 15. Set durationFormat.[[DataLocale]] to r.[[dataLocale]].
    duration_format->set_data_locale(move(result.data_locale));

    // 16. Let prevStyle be undefined.
    Optional<String> previous_style;

    // 17. For each row in Table 1, 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.
        auto style_slot = duration_instances_component.set_style_slot;

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

        // c. Let unit be the Unit value.
        auto unit = duration_instances_component.unit;

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

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

        // f. Let unitOptions be ? GetDurationUnitOptions(unit, options, style, valueList, digitalBase, prevStyle).
        auto unit_options = TRY(get_duration_unit_options(vm, unit, *options, style.as_string().string(), value_list, digital_base, previous_style));

        // 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 = unit_options.style;
        }
    }

    // 18. 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, {}))));

    // 19. 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 ? SupportedLocales(availableLocales, requestedLocales, options).
    return TRY(supported_locales(vm, requested_locales, options));
}

}