#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/QueuingStrategy.h>
#include <LibWeb/Bindings/TransformStream.h>
#include <LibWeb/Streams/ReadableStream.h>
#include <LibWeb/Streams/TransformStream.h>
#include <LibWeb/Streams/WritableStream.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

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

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

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

    // 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<TransformStreamPrototype>(*target_realm, "TransformStream"_fly_string);
    }

    auto arg0 = vm.argument(0);
    GC::Ptr<JS::Object> transformer {};
    if (!arg0.is_undefined())
        transformer = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Object>> {
        if (!arg0.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, arg0);
        return GC::Ref { arg0.as_object() };
    }(); }));

    auto arg1 = vm.argument(1);
    QueuingStrategy writable_strategy = QueuingStrategy {};
    if (!arg1.is_undefined())
        writable_strategy = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_queuing_strategy(vm, arg1); }));

    auto arg2 = vm.argument(2);
    QueuingStrategy readable_strategy = QueuingStrategy {};
    if (!arg2.is_undefined())
        readable_strategy = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_queuing_strategy(vm, arg2); }));

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return Streams::TransformStream::construct_impl(realm, transformer, writable_strategy, readable_strategy); }));

    // 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 TransformStream" algorithm
    // (https://webidl.spec.whatwg.org/#js-platform-objects) are currently not handled, or are handled within Streams::TransformStream::construct_impl().

    return *impl;
}

void TransformStreamPrototype::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 readable_id = "readable"_utf16_fly_string;
    auto native_readable_getter = JS::NativeFunction::create(realm, readable_getter, 0, readable_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_readable_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto readable_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(readable_id, native_readable_getter, native_readable_setter, readable_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.
    auto writable_id = "writable"_utf16_fly_string;
    auto native_writable_getter = JS::NativeFunction::create(realm, writable_getter, 0, writable_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_writable_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto writable_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(writable_id, native_writable_getter, native_writable_setter, writable_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, "TransformStream"_utf16), JS::Attribute::Configurable);
}

void TransformStreamPrototype::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<Streams::TransformStream*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<Streams::TransformStream*> 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(TransformStreamPrototype::readable_getter)
{
    WebIDL::log_trace(vm, "TransformStreamPrototype::readable_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->readable(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(TransformStreamPrototype::writable_getter)
{
    WebIDL::log_trace(vm, "TransformStreamPrototype::writable_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->writable(); }));

    return JS::Value(R);
}

} // namespace Web::Bindings