#include <AK/Utf16String.h>
#include <AK/Variant.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/StylePropertyMapReadOnly.h>
#include <LibWeb/CSS/CSSStyleValue.h>
#include <LibWeb/CSS/StylePropertyMapReadOnly.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::Bindings {

void StylePropertyMapReadOnlyConstructor::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, "StylePropertyMapReadOnly"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<StylePropertyMapReadOnlyPrototype>(realm, "StylePropertyMapReadOnly"_fly_string), 0);
}

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

void StylePropertyMapReadOnlyPrototype::initialize(JS::Realm& realm, JS::Object& object)
{
    [[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 size_id = "size"_utf16_fly_string;
    auto native_size_getter = JS::NativeFunction::create(realm, size_getter, 0, size_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_size_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto size_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(size_id, native_size_getter, native_size_setter, size_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, "get"_utf16_fly_string, get, 1, default_attributes);

    object.define_native_function(realm, "getAll"_utf16_fly_string, get_all, 1, default_attributes);

    object.define_native_function(realm, "has"_utf16_fly_string, has, 1, default_attributes);

    object.define_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "StylePropertyMapReadOnly"_utf16), JS::Attribute::Configurable);
}

void StylePropertyMapReadOnlyPrototype::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<CSS::StylePropertyMapReadOnly*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<CSS::StylePropertyMapReadOnly*> 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(StylePropertyMapReadOnlyPrototype::size_getter)
{
    WebIDL::log_trace(vm, "StylePropertyMapReadOnlyPrototype::size_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->size(); }));

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

JS_DEFINE_NATIVE_FUNCTION(StylePropertyMapReadOnlyPrototype::get)
{
    WebIDL::log_trace(vm, "StylePropertyMapReadOnlyPrototype::get");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] CSS::StylePropertyMapReadOnly* idl_object = TRY(impl_from(vm));

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

    auto arg0 = vm.argument(0);
    auto property = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_usv_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->get(property); }));
    return R.visit(
        [&](GC::Ref<CSS::CSSStyleValue> const& visited_union_value1) -> JS::Value
        {
            return JS::Value(visited_union_value1);
        },
        [](Empty) -> JS::Value
        {
            return JS::js_undefined();
        }
    );
}

JS_DEFINE_NATIVE_FUNCTION(StylePropertyMapReadOnlyPrototype::get_all)
{
    WebIDL::log_trace(vm, "StylePropertyMapReadOnlyPrototype::get_all");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] CSS::StylePropertyMapReadOnly* idl_object = TRY(impl_from(vm));

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

    auto arg0 = vm.argument(0);
    auto property = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_usv_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->get_all(property); }));
    return [&]() -> JS::Value {
        // An IDL sequence<T> value S is converted to a JavaScript value as follows:
        // 1. Let n be the length of S.
        auto sequence_length = R.size();

        // 2. Let A be a new Array object created as if by the expression [].
        auto sequence_array = MUST(JS::Array::create(realm, sequence_length));

        // 3. Initialize i to be 0.
        // 4. While i < n:
        for (size_t sequence_index = 0; sequence_index < sequence_length; ++sequence_index) {
            // 1. Let V be the value in S at index i.
            auto& sequence_element = R.at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = JS::Value(sequence_element);

            // 3. Let P be the result of calling ! ToString(i).
            // 4. Perform ! CreateDataPropertyOrThrow(A, P, E).
            MUST(sequence_array->create_data_property(JS::PropertyKey { sequence_index }, js_sequence_element));

            // 5. Set i to i + 1.
        }

        // 5. Return A.
        return sequence_array;
    }();
}

JS_DEFINE_NATIVE_FUNCTION(StylePropertyMapReadOnlyPrototype::has)
{
    WebIDL::log_trace(vm, "StylePropertyMapReadOnlyPrototype::has");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] CSS::StylePropertyMapReadOnly* idl_object = TRY(impl_from(vm));

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

    auto arg0 = vm.argument(0);
    auto property = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_usv_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->has(property); }));
    return JS::Value(R);
}

} // namespace Web::Bindings