#include <AK/Variant.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/CSSMathInvert.h>
#include <LibWeb/Bindings/CSSMathValue.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/CSS/CSSMathInvert.h>
#include <LibWeb/CSS/CSSNumericValue.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

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

    object.set_prototype(&ensure_web_constructor<CSSMathValuePrototype>(realm, "CSSMathValue"_fly_string));
    object.define_direct_property(vm.names.length, JS::Value(1), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "CSSMathInvert"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<CSSMathInvertPrototype>(realm, "CSSMathInvert"_fly_string), 0);
}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> CSSMathInvertConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "CSSMathInvertConstructor::construct");
    auto& vm = constructor.vm();
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // To internally create a new object implementing the interface CSSMathInvert:

    // 3.2. Let prototype be ? Get(newTarget, "prototype").
    auto prototype = TRY(new_target.get(vm.names.prototype));

    // 3.3. If Type(prototype) is not Object, then:
    if (!prototype.is_object()) {
        // 1. Let targetRealm be ? GetFunctionRealm(newTarget).
        auto* target_realm = TRY(JS::get_function_realm(vm, new_target));

        // 2. Set prototype to the interface prototype object for interface in targetRealm.
        VERIFY(target_realm);
        prototype = &Bindings::ensure_web_prototype<CSSMathInvertPrototype>(*target_realm, "CSSMathInvert"_fly_string);
    }

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

    auto arg0 = vm.argument(0);
    auto arg = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Variant<double, GC::Ref<CSS::CSSNumericValue>>> {

        if (arg0.is_object()) {
            [[maybe_unused]] auto& object = arg0.as_object();

            if (is<PlatformObject>(object)) {

                if (auto* result = as_if<CSS::CSSNumericValue>(object))
                    return Variant<double, GC::Ref<CSS::CSSNumericValue>> { GC::Ref { *result } };
            }
        }

        if (arg0.is_number()) {
            auto arg_number = TRY([&]() -> JS::ThrowCompletionOr<double> {
        auto x = TRY(arg0.to_double(vm));
        if (isinf(x) || isnan(x))
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidRestrictedFloatingPointParameter, "arg");
        return x;
    }());
            return Variant<double, GC::Ref<CSS::CSSNumericValue>> { arg_number };
        }

        auto arg_number_fallback = TRY([&]() -> JS::ThrowCompletionOr<double> {
        auto x = TRY(arg0.to_double(vm));
        if (isinf(x) || isnan(x))
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidRestrictedFloatingPointParameter, "arg");
        return x;
    }());
        return Variant<double, GC::Ref<CSS::CSSNumericValue>> { arg_number_fallback };

        return vm.throw_completion<JS::TypeError>("No union types matched"_utf16);
    }(); }));

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return CSS::CSSMathInvert::construct_impl(realm, arg); }));

    // 7. Set instance.[[Prototype]] to prototype.
    VERIFY(prototype.is_object());
    impl->set_prototype(&prototype.as_object());

    // FIXME: Steps 8...11. of the "internally create a new object implementing the interface CSSMathInvert" algorithm
    // (https://webidl.spec.whatwg.org/#js-platform-objects) are currently not handled, or are handled within CSS::CSSMathInvert::construct_impl().

    return *impl;
}

void CSSMathInvertPrototype::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(GC::Ref { ensure_web_prototype<CSSMathValuePrototype>(realm, "CSSMathValue"_fly_string) });

    auto value_id = "value"_utf16_fly_string;
    auto native_value_getter = JS::NativeFunction::create(realm, value_getter, 0, value_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_value_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto value_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(value_id, native_value_getter, native_value_setter, value_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_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "CSSMathInvert"_utf16), JS::Attribute::Configurable);
}

void CSSMathInvertPrototype::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::CSSMathInvert*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<CSS::CSSMathInvert*> 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(CSSMathInvertPrototype::value_getter)
{
    WebIDL::log_trace(vm, "CSSMathInvertPrototype::value_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->value(); }));

    return JS::Value(R);
}

} // namespace Web::Bindings