#include <AK/TypeCasts.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/AudioBuffer.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/WebAudio/AudioBuffer.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::Bindings {

void AudioBufferConstructor::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(1), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "AudioBuffer"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<AudioBufferPrototype>(realm, "AudioBuffer"_fly_string), 0);
}

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

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

    // 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<AudioBufferPrototype>(*target_realm, "AudioBuffer"_fly_string);
    }

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

    auto arg0 = vm.argument(0);
    auto options = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_audio_buffer_options(vm, arg0); }));

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return WebAudio::AudioBuffer::construct_impl(realm, options); }));

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

    return *impl;
}

void AudioBufferPrototype::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 sample_rate_id = "sampleRate"_utf16_fly_string;
    auto native_sample_rate_getter = JS::NativeFunction::create(realm, sample_rate_getter, 0, sample_rate_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_sample_rate_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto sample_rate_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(sample_rate_id, native_sample_rate_getter, native_sample_rate_setter, sample_rate_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 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.
    auto duration_id = "duration"_utf16_fly_string;
    auto native_duration_getter = JS::NativeFunction::create(realm, duration_getter, 0, duration_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_duration_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto duration_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(duration_id, native_duration_getter, native_duration_setter, duration_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 number_of_channels_id = "numberOfChannels"_utf16_fly_string;
    auto native_number_of_channels_getter = JS::NativeFunction::create(realm, number_of_channels_getter, 0, number_of_channels_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_number_of_channels_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto number_of_channels_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(number_of_channels_id, native_number_of_channels_getter, native_number_of_channels_setter, number_of_channels_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, "getChannelData"_utf16_fly_string, get_channel_data, 1, default_attributes);

    object.define_native_function(realm, "copyFromChannel"_utf16_fly_string, copy_from_channel, 2, default_attributes);

    object.define_native_function(realm, "copyToChannel"_utf16_fly_string, copy_to_channel, 2, default_attributes);

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

void AudioBufferPrototype::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<WebAudio::AudioBuffer*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<WebAudio::AudioBuffer*> 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(AudioBufferPrototype::sample_rate_getter)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::sample_rate_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->sample_rate(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(AudioBufferPrototype::length_getter)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::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(AudioBufferPrototype::duration_getter)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::duration_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->duration(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(AudioBufferPrototype::number_of_channels_getter)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::number_of_channels_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->number_of_channels(); }));

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

JS_DEFINE_NATIVE_FUNCTION(AudioBufferPrototype::get_channel_data)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::get_channel_data");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] WebAudio::AudioBuffer* idl_object = TRY(impl_from(vm));

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

    auto arg0 = vm.argument(0);
    auto channel = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, arg0, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

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

JS_DEFINE_NATIVE_FUNCTION(AudioBufferPrototype::copy_from_channel)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::copy_from_channel");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] WebAudio::AudioBuffer* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 2)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountMany, "copyFromChannel", "2");

    auto arg0 = vm.argument(0);
    auto destination = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Float32Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Float32Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Float32Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Float32Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }(); }));

    auto arg1 = vm.argument(1);
    auto channel_number = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, arg1, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

    auto arg2 = vm.argument(2);
    WebIDL::UnsignedLong buffer_offset = 0;
    if (!arg2.is_undefined())
        buffer_offset = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, arg2, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->copy_from_channel(destination, channel_number, buffer_offset); }));
    return JS::js_undefined();
}

JS_DEFINE_NATIVE_FUNCTION(AudioBufferPrototype::copy_to_channel)
{
    WebIDL::log_trace(vm, "AudioBufferPrototype::copy_to_channel");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] WebAudio::AudioBuffer* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 2)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountMany, "copyToChannel", "2");

    auto arg0 = vm.argument(0);
    auto source = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<JS::Float32Array>> {
        // A JavaScript value V is converted to an IDL typed array value by running the following algorithm:
        // 1. Let T be the IDL type V is being converted to.
        // 2. If V is not an Object, or V does not have a [[TypedArrayName]] internal slot with a value equal to T's name,
        //    then throw a TypeError.
        auto builtin_buffer = arg0.as_if<JS::Float32Array>();
        if (!builtin_buffer)
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Float32Array");

        auto& viewed_array_buffer = *builtin_buffer->viewed_array_buffer();

        // 2. If the conversion is not to an IDL type associated with the [AllowShared] extended attribute, and
        //    IsSharedArrayBuffer(V.[[ViewedArrayBuffer]]) is true, then throw a TypeError.
        if (viewed_array_buffer.is_shared_array_buffer())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::SharedArrayBuffer);

        // 3. If the conversion is not to an IDL type associated with the [AllowResizable] extended attribute, and
        //    IsFixedLengthArrayBuffer(V.[[ViewedArrayBuffer]]) is false, then throw a TypeError.
        if (!viewed_array_buffer.is_fixed_length())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "fixed-length Float32Array");

        // 5. Return the IDL value of type T that is a reference to the same object as V.
        return GC::Ref { *builtin_buffer };
    }(); }));

    auto arg1 = vm.argument(1);
    auto channel_number = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, arg1, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

    auto arg2 = vm.argument(2);
    WebIDL::UnsignedLong buffer_offset = 0;
    if (!arg2.is_undefined())
        buffer_offset = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, arg2, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->copy_to_channel(source, channel_number, buffer_offset); }));
    return JS::js_undefined();
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<AudioBufferOptions> convert_to_idl_value_for_audio_buffer_options(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, "AudioBufferOptions");

    // 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 AudioBufferOptions {
        .length = TRY([&]() -> JS::ThrowCompletionOr<WebIDL::UnsignedLong> {
            // 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("length"_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 WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, js_member_value, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "length");
        }()),
        .number_of_channels = TRY([&]() -> JS::ThrowCompletionOr<WebIDL::UnsignedLong> {
            // 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("numberOfChannels"_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 WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, js_member_value, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

                // 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 = 1;

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
        .sample_rate = TRY([&]() -> JS::ThrowCompletionOr<float> {
            // 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("sampleRate"_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<float> {
        float x = TRY(js_member_value.to_double(vm));
        if (isinf(x) || isnan(x))
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidRestrictedFloatingPointParameter, "sampleRate");
        return x;
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "sampleRate");
        }()),
    };
}

} // namespace Web::Bindings