#include <AK/Utf16String.h>
#include <AK/Variant.h>
#include <LibJS/Runtime/ArrayPrototype.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/HTMLAllCollection.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/HTMLCollection.h>
#include <LibWeb/HTML/HTMLAllCollection.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::Bindings {

void HTMLAllCollectionConstructor::initialize(JS::Realm& realm, JS::NativeFunction& object)
{
    auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;

    
    object.define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "HTMLAllCollection"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<HTMLAllCollectionPrototype>(realm, "HTMLAllCollection"_fly_string), 0);
}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> HTMLAllCollectionConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "HTMLAllCollectionConstructor::construct");
    return constructor.vm().throw_completion<JS::TypeError>(JS::ErrorType::NotAConstructor, "HTMLAllCollection");
}

GC_DEFINE_ALLOCATOR(HTMLAllCollectionPrototype);

HTMLAllCollectionPrototype::HTMLAllCollectionPrototype([[maybe_unused]] JS::Realm& realm)
    : Object(ConstructWithPrototypeTag::Tag, realm.intrinsics().object_prototype())
{
}

HTMLAllCollectionPrototype::~HTMLAllCollectionPrototype()
{
}


void HTMLAllCollectionPrototype::initialize(JS::Realm& realm)
{
    auto& object = *this;
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable;

    object.set_prototype(realm.intrinsics().object_prototype());

    auto length_id = "length"_utf16_fly_string;
    auto native_length_getter = JS::NativeFunction::create(realm, length_getter, 0, length_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_length_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto length_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(length_id, native_length_getter, native_length_setter, length_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    object.define_native_function(realm, "item"_utf16_fly_string, item, 0, default_attributes);

    object.define_native_function(realm, "namedItem"_utf16_fly_string, named_item, 1, default_attributes);
    object.define_direct_property(vm.well_known_symbol_iterator(), realm.intrinsics().array_prototype()->get_without_side_effects(vm.names.values), JS::Attribute::Configurable | JS::Attribute::Writable);

    object.define_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "HTMLAllCollection"_utf16), JS::Attribute::Configurable);
    Base::initialize(realm);
}

void HTMLAllCollectionPrototype::define_unforgeable_attributes(JS::Realm& realm, [[maybe_unused]] JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;
}

[[maybe_unused]] static JS::ThrowCompletionOr<HTML::HTMLAllCollection*> impl_from(JS::VM& vm, JS::Value js_value)
{

    if (auto impl = js_value.as_if<HTML::HTMLAllCollection>())
        return impl.ptr();
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "HTMLAllCollection");
}

[[maybe_unused]] static JS::ThrowCompletionOr<HTML::HTMLAllCollection*> impl_from(JS::VM& vm)
{
    auto this_value = vm.this_value();
    if (this_value.is_nullish())
        this_value = &vm.current_realm()->global_object();
    return impl_from(vm, this_value);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLAllCollectionPrototype::length_getter)
{
    WebIDL::log_trace(vm, "HTMLAllCollectionPrototype::length_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->length(); }));

    return JS::Value(static_cast<WebIDL::UnsignedLong>(R));
}

JS_DEFINE_NATIVE_FUNCTION(HTMLAllCollectionPrototype::item)
{
    WebIDL::log_trace(vm, "HTMLAllCollectionPrototype::item");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] HTML::HTMLAllCollection* idl_object = TRY(impl_from(vm));

    auto arg0 = vm.argument(0);
    Optional<Utf16String> name_or_index {};
    if (!arg0.is_undefined())
        name_or_index = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->item(name_or_index); }));
    return R.visit(
        [&](GC::Ref<DOM::HTMLCollection> const& visited_union_value0) -> JS::Value
        {
            return JS::Value(visited_union_value0);
        },
        [&](GC::Ref<DOM::Element> const& visited_union_value1) -> JS::Value
        {
            return JS::Value(visited_union_value1);
        },
        [](Empty) -> JS::Value
        {
            return JS::js_null();
        }
    );
}

JS_DEFINE_NATIVE_FUNCTION(HTMLAllCollectionPrototype::named_item)
{
    WebIDL::log_trace(vm, "HTMLAllCollectionPrototype::named_item");
    [[maybe_unused]] auto* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "namedItem");

    auto arg0 = vm.argument(0);
    auto name = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, arg0));
    }(); }));



    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->named_item(name); }));
    return R.visit(
        [&](GC::Ref<DOM::HTMLCollection> const& visited_union_value0) -> JS::Value
        {
            return JS::Value(visited_union_value0);
        },
        [&](GC::Ref<DOM::Element> const& visited_union_value1) -> JS::Value
        {
            return JS::Value(visited_union_value1);
        },
        [](Empty) -> JS::Value
        {
            return JS::js_null();
        }
    );
}

} // namespace Web::Bindings