#include <AK/Utf16String.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/MediaKeySystemAccess.h>
#include <LibWeb/EncryptedMediaExtensions/MediaKeySystemAccess.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

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

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

void MediaKeySystemAccessPrototype::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 key_system_id = "keySystem"_utf16_fly_string;
    auto native_key_system_getter = JS::NativeFunction::create(realm, key_system_getter, 0, key_system_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_key_system_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto key_system_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(key_system_id, native_key_system_getter, native_key_system_setter, key_system_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, "getConfiguration"_utf16_fly_string, get_configuration, 0, default_attributes);

    object.define_direct_property("createMediaKeys"_utf16_fly_string, JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);

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

void MediaKeySystemAccessPrototype::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<EncryptedMediaExtensions::MediaKeySystemAccess*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<EncryptedMediaExtensions::MediaKeySystemAccess*> 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(MediaKeySystemAccessPrototype::key_system_getter)
{
    WebIDL::log_trace(vm, "MediaKeySystemAccessPrototype::key_system_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->key_system(); }));

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(MediaKeySystemAccessPrototype::get_configuration)
{
    WebIDL::log_trace(vm, "MediaKeySystemAccessPrototype::get_configuration");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] EncryptedMediaExtensions::MediaKeySystemAccess* idl_object = TRY(impl_from(vm));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->get_configuration(); }));
    return [&]() -> JS::Value {
        // 1. Let O be OrdinaryObjectCreate(%Object.prototype%).
        auto dictionary_object = JS::Object::create(realm, realm.intrinsics().object_prototype());

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("audioCapabilities"_utf16_fly_string, [&]() -> 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.audio_capabilities.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.audio_capabilities.at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = [&]() -> JS::Value {
        // 1. Let O be OrdinaryObjectCreate(%Object.prototype%).
        auto dictionary_object = JS::Object::create(realm, realm.intrinsics().object_prototype());

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("contentType"_utf16_fly_string, WebIDL::primitive_string_from_string(vm, sequence_element.content_type)));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("encryptionScheme"_utf16_fly_string, [&]() -> JS::Value {
        // 1. If the IDL nullable type T? value is null, then the JavaScript value is null.
        if (!sequence_element.encryption_scheme.has_value())
            return JS::js_null();

        // 2. Otherwise, the JavaScript value is the result of converting the IDL nullable type value to the inner IDL type T.
        return JS::Value(WebIDL::primitive_string_from_string(vm, sequence_element.encryption_scheme.value()));
    }()));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("robustness"_utf16_fly_string, WebIDL::primitive_string_from_string(vm, sequence_element.robustness)));

        // 4. Return O.
        return dictionary_object;
    }();

            // 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;
    }()));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("distinctiveIdentifier"_utf16_fly_string, JS::PrimitiveString::create(vm, idl_enum_to_string(R.distinctive_identifier))));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("initDataTypes"_utf16_fly_string, [&]() -> 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.init_data_types.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.init_data_types.at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = WebIDL::primitive_string_from_string(vm, 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;
    }()));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("label"_utf16_fly_string, WebIDL::primitive_string_from_string(vm, R.label)));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("persistentState"_utf16_fly_string, JS::PrimitiveString::create(vm, idl_enum_to_string(R.persistent_state))));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:
        if (R.session_types.has_value()) {

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("sessionTypes"_utf16_fly_string, [&]() -> 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.session_types.value().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.session_types.value().at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = WebIDL::primitive_string_from_string(vm, 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;
    }()));
        }

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("videoCapabilities"_utf16_fly_string, [&]() -> 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.video_capabilities.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.video_capabilities.at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = [&]() -> JS::Value {
        // 1. Let O be OrdinaryObjectCreate(%Object.prototype%).
        auto dictionary_object = JS::Object::create(realm, realm.intrinsics().object_prototype());

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("contentType"_utf16_fly_string, WebIDL::primitive_string_from_string(vm, sequence_element.content_type)));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("encryptionScheme"_utf16_fly_string, [&]() -> JS::Value {
        // 1. If the IDL nullable type T? value is null, then the JavaScript value is null.
        if (!sequence_element.encryption_scheme.has_value())
            return JS::js_null();

        // 2. Otherwise, the JavaScript value is the result of converting the IDL nullable type value to the inner IDL type T.
        return JS::Value(WebIDL::primitive_string_from_string(vm, sequence_element.encryption_scheme.value()));
    }()));

        // 1. Let key be the identifier of member.
        // 2. If V[key] exists, then:

        // 1. Let idlValue be V[key].
        // 2. Let value be the result of converting idlValue to a JavaScript value.
        // 3. Perform ! CreateDataPropertyOrThrow(O, key, value).
        MUST(dictionary_object->create_data_property("robustness"_utf16_fly_string, WebIDL::primitive_string_from_string(vm, sequence_element.robustness)));

        // 4. Return O.
        return dictionary_object;
    }();

            // 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;
    }()));

        // 4. Return O.
        return dictionary_object;
    }();
}

// https://webidl.spec.whatwg.org/#idl-enumeration
JS::ThrowCompletionOr<MediaKeysRequirement> convert_to_idl_value_for_media_keys_requirement(JS::VM& vm, JS::Value value)
{
    // 1. Let S be the result of calling ? ToString(V).
    auto value_as_string = TRY(value.to_utf16_string(vm));

    // 2. If S is not one of E’s enumeration values, then throw a TypeError.
    // 3. Return the enumeration value of type E that is equal to S.
    if (value_as_string == "required"sv)
        return MediaKeysRequirement::Required;
    if (value_as_string == "optional"sv)
        return MediaKeysRequirement::Optional;
    if (value_as_string == "not-allowed"sv)
        return MediaKeysRequirement::NotAllowed;
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, value_as_string, "MediaKeysRequirement");
}

// https://webidl.spec.whatwg.org/#idl-enumeration
Utf16String idl_enum_to_string(MediaKeysRequirement value)
{
    // The result of converting an IDL enumeration type value to a JavaScript value is the String value that represents the same sequence of code units as the enumeration value.
    switch (value) {
    case MediaKeysRequirement::Required:
        return "required"_utf16;
    case MediaKeysRequirement::Optional:
        return "optional"_utf16;
    case MediaKeysRequirement::NotAllowed:
        return "not-allowed"_utf16;
    }
    VERIFY_NOT_REACHED();
}

// https://webidl.spec.whatwg.org/#idl-enumeration
JS::ThrowCompletionOr<MediaKeySessionType> convert_to_idl_value_for_media_key_session_type(JS::VM& vm, JS::Value value)
{
    // 1. Let S be the result of calling ? ToString(V).
    auto value_as_string = TRY(value.to_utf16_string(vm));

    // 2. If S is not one of E’s enumeration values, then throw a TypeError.
    // 3. Return the enumeration value of type E that is equal to S.
    if (value_as_string == "temporary"sv)
        return MediaKeySessionType::Temporary;
    if (value_as_string == "persistent-license"sv)
        return MediaKeySessionType::PersistentLicense;
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, value_as_string, "MediaKeySessionType");
}

// https://webidl.spec.whatwg.org/#idl-enumeration
Utf16String idl_enum_to_string(MediaKeySessionType value)
{
    // The result of converting an IDL enumeration type value to a JavaScript value is the String value that represents the same sequence of code units as the enumeration value.
    switch (value) {
    case MediaKeySessionType::Temporary:
        return "temporary"_utf16;
    case MediaKeySessionType::PersistentLicense:
        return "persistent-license"_utf16;
    }
    VERIFY_NOT_REACHED();
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<MediaKeySystemConfiguration> convert_to_idl_value_for_media_key_system_configuration(JS::VM& vm, JS::Value js_dict)
{
    // 1. If jsDict is not an Object and jsDict is neither undefined nor null, then throw a TypeError.
    if (!js_dict.is_object() && !js_dict.is_nullish())
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "MediaKeySystemConfiguration");

    // 2. Let idlDict be an empty ordered map, representing a dictionary of type D.
    // 3. Let dictionaries be a list consisting of D and all of D’s inherited dictionaries, in order from least to most derived.
    // 4. For each dictionary dictionary in dictionaries, in order:
    // NB: We defer construction until the return initializer because some members may not be default-constructible. Inherited dictionaries are represented by the generated C++ struct inheritance.

    // 5. Return idlDict.
    return MediaKeySystemConfiguration {
        .audio_capabilities = TRY([&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("audioCapabilities"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
        if (!js_member_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, js_member_value);

        auto method = TRY(js_member_value.get_method(vm, vm.well_known_symbol_iterator()));
        if (!method)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, js_member_value);

        return TRY([&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, js_member_value, *method));

        Vector<MediaKeySystemMediaCapability> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_media_key_system_media_capability(vm, next_value); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Vector<MediaKeySystemMediaCapability> {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .distinctive_identifier = TRY([&]() -> JS::ThrowCompletionOr<MediaKeysRequirement> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("distinctiveIdentifier"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_media_keys_requirement(vm, js_member_value); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = MediaKeysRequirement::Optional;

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .init_data_types = TRY([&]() -> JS::ThrowCompletionOr<Vector<Utf16String>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("initDataTypes"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Vector<Utf16String>> {
        if (!js_member_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, js_member_value);

        auto method = TRY(js_member_value.get_method(vm, vm.well_known_symbol_iterator()));
        if (!method)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, js_member_value);

        return TRY([&]() -> JS::ThrowCompletionOr<Vector<Utf16String>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, js_member_value, *method));

        Vector<Utf16String> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, next_value));
    }(); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Vector<Utf16String> {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .label = TRY([&]() -> JS::ThrowCompletionOr<Utf16String> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("label"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, js_member_value));
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Utf16String {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .persistent_state = TRY([&]() -> JS::ThrowCompletionOr<MediaKeysRequirement> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("persistentState"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_media_keys_requirement(vm, js_member_value); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = MediaKeysRequirement::Optional;

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .session_types = TRY([&]() -> JS::ThrowCompletionOr<Optional<Vector<Utf16String>>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("sessionTypes"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Vector<Utf16String>> {
        if (!js_member_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, js_member_value);

        auto method = TRY(js_member_value.get_method(vm, vm.well_known_symbol_iterator()));
        if (!method)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, js_member_value);

        return TRY([&]() -> JS::ThrowCompletionOr<Vector<Utf16String>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, js_member_value, *method));

        Vector<Utf16String> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, next_value));
    }(); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 7. Otherwise, jsMemberValue is undefined and the member is optional.
            return OptionalNone {};
        }()),
        .video_capabilities = TRY([&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("videoCapabilities"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
        if (!js_member_value.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, js_member_value);

        auto method = TRY(js_member_value.get_method(vm, vm.well_known_symbol_iterator()));
        if (!method)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, js_member_value);

        return TRY([&]() -> JS::ThrowCompletionOr<Vector<MediaKeySystemMediaCapability>> {
        // To create an IDL value of type sequence<T> given an iterable iterable and an iterator getter method, perform the following steps:
        // 1. Let iteratorRecord be ? GetIteratorFromMethod(iterable, method).
        auto iterator = TRY(JS::get_iterator_from_method(vm, js_member_value, *method));

        Vector<MediaKeySystemMediaCapability> sequence;

        // 2. Initialize i to be 0.
        // 3. Repeat
        for (;;) {
            // 1. Let next be ? IteratorStepValue(iteratorRecord).
            auto next = TRY(JS::iterator_step_value(vm, iterator));

            // 2. If next is done, then return an IDL sequence value of type sequence<T> of length i, where the value of the element at index j is Sj.
            if (!next.has_value())
                break;

            // 3. Initialize Si to the result of converting next to an IDL value of type T.
            auto next_value = next.release_value();
            auto sequence_item = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_media_key_system_media_capability(vm, next_value); }));

            // 4. Set i to i + 1.
            sequence.append(sequence_item);
        }

        return sequence;
    }());
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Vector<MediaKeySystemMediaCapability> {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
    };
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<MediaKeySystemMediaCapability> convert_to_idl_value_for_media_key_system_media_capability(JS::VM& vm, JS::Value js_dict)
{
    // 1. If jsDict is not an Object and jsDict is neither undefined nor null, then throw a TypeError.
    if (!js_dict.is_object() && !js_dict.is_nullish())
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "MediaKeySystemMediaCapability");

    // 2. Let idlDict be an empty ordered map, representing a dictionary of type D.
    // 3. Let dictionaries be a list consisting of D and all of D’s inherited dictionaries, in order from least to most derived.
    // 4. For each dictionary dictionary in dictionaries, in order:
    // NB: We defer construction until the return initializer because some members may not be default-constructible. Inherited dictionaries are represented by the generated C++ struct inheritance.

    // 5. Return idlDict.
    return MediaKeySystemMediaCapability {
        .content_type = TRY([&]() -> JS::ThrowCompletionOr<Utf16String> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("contentType"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, js_member_value));
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Utf16String {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .encryption_scheme = TRY([&]() -> JS::ThrowCompletionOr<Optional<Utf16String>> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("encryptionScheme"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Optional<Utf16String>> {
        Optional<Utf16String> value;

        if (!js_member_value.is_nullish()) {

            value = TRY([&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, js_member_value));
    }());
        }
        return value;
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = OptionalNone {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .robustness = TRY([&]() -> JS::ThrowCompletionOr<Utf16String> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("robustness"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<Utf16String> {
        return TRY(WebIDL::to_utf16_string(vm, js_member_value));
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = Utf16String {};

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
    };
}

} // namespace Web::Bindings