/*
 * Copyright (c) 2022, Daniel Ehrenberg <dan@littledan.dev>
 * Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
 * Copyright (c) 2024, Kenneth Myhra <kennethmyhra@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Result.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibIPC/Forward.h>
#include <LibJS/Forward.h>
#include <LibWeb/WebIDL/ExceptionOr.h>

// Structured serialize is an entirely different format from IPC because:
// - It contains representation of type information
// - It may contain circularities
// - It is restricted to JS values

namespace Web::HTML {

using SerializationRecord = Vector<u32>;
using SerializationMemory = HashMap<JS::Handle<JS::Value>, u32>;
using DeserializationMemory = JS::MarkedVector<JS::Value>;

struct TransferDataHolder {
    Vector<u8> data;
    Vector<IPC::File> fds;
};

struct SerializedTransferRecord {
    SerializationRecord serialized;
    Vector<TransferDataHolder> transfer_data_holders;
};

struct DeserializedTransferRecord {
    JS::Value deserialized;
    Vector<JS::Handle<JS::Object>> transferred_values;
};

enum class TransferType : u8 {
    MessagePort,
};

WebIDL::ExceptionOr<SerializationRecord> structured_serialize(JS::VM& vm, JS::Value);
WebIDL::ExceptionOr<SerializationRecord> structured_serialize_for_storage(JS::VM& vm, JS::Value);
WebIDL::ExceptionOr<SerializationRecord> structured_serialize_internal(JS::VM& vm, JS::Value, bool for_storage, SerializationMemory&);

WebIDL::ExceptionOr<JS::Value> structured_deserialize(JS::VM& vm, SerializationRecord const& serialized, JS::Realm& target_realm, Optional<DeserializationMemory>);

void serialize_boolean_primitive(SerializationRecord& serialized, JS::Value& value);
void serialize_number_primitive(SerializationRecord& serialized, JS::Value& value);
WebIDL::ExceptionOr<void> serialize_big_int_primitive(JS::VM& vm, SerializationRecord& serialized, JS::Value& value);
WebIDL::ExceptionOr<void> serialize_string_primitive(JS::VM& vm, SerializationRecord& serialized, JS::Value& value);
void serialize_boolean_object(SerializationRecord& serialized, JS::Value& value);
void serialize_number_object(SerializationRecord& serialized, JS::Value& value);
WebIDL::ExceptionOr<void> serialize_big_int_object(JS::VM& vm, SerializationRecord& serialized, JS::Value& value);
WebIDL::ExceptionOr<void> serialize_string_object(JS::VM& vm, SerializationRecord& serialized, JS::Value& value);
void serialize_date_object(SerializationRecord& serialized, JS::Value& value);
WebIDL::ExceptionOr<void> serialize_reg_exp_object(JS::VM& vm, SerializationRecord& serialized, JS::Value& value);
void serialize_u64(SerializationRecord& serialized, u64 value);
void serialize_i64(SerializationRecord& serialized, i64 value);

WebIDL::ExceptionOr<void> serialize_bytes(JS::VM& vm, Vector<u32>& vector, ReadonlyBytes bytes);
WebIDL::ExceptionOr<void> serialize_string(JS::VM& vm, Vector<u32>& vector, DeprecatedFlyString const& string);
WebIDL::ExceptionOr<void> serialize_string(JS::VM& vm, Vector<u32>& vector, String const& string);
WebIDL::ExceptionOr<void> serialize_string(JS::VM& vm, Vector<u32>& vector, JS::PrimitiveString const& primitive_string);
WebIDL::ExceptionOr<void> serialize_array_buffer(JS::VM& vm, Vector<u32>& vector, JS::ArrayBuffer const& array_buffer, bool for_storage);
template<OneOf<JS::TypedArrayBase, JS::DataView> ViewType>
WebIDL::ExceptionOr<void> serialize_viewed_array_buffer(JS::VM& vm, Vector<u32>& vector, ViewType const& view, bool for_storage, SerializationMemory& memory);

bool deserialize_boolean_primitive(ReadonlySpan<u32> const& serialized, size_t& position);
double deserialize_number_primitive(ReadonlySpan<u32> const& serialized, size_t& position);
JS::NonnullGCPtr<JS::BooleanObject> deserialize_boolean_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
JS::NonnullGCPtr<JS::NumberObject> deserialize_number_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::BigIntObject>> deserialize_big_int_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::StringObject>> deserialize_string_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
JS::NonnullGCPtr<JS::Date> deserialize_date_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::RegExpObject>> deserialize_reg_exp_object(JS::Realm& realm, ReadonlySpan<u32> const& serialized, size_t& position);
u64 deserialize_u64(ReadonlySpan<u32> const& serialized, size_t& position);
i64 deserialize_i64(ReadonlySpan<u32> const& serialized, size_t& position);

WebIDL::ExceptionOr<ByteBuffer> deserialize_bytes(JS::VM& vm, ReadonlySpan<u32> vector, size_t& position);
WebIDL::ExceptionOr<String> deserialize_string(JS::VM& vm, ReadonlySpan<u32> vector, size_t& position);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::PrimitiveString>> deserialize_string_primitive(JS::VM& vm, ReadonlySpan<u32> vector, size_t& position);
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::BigInt>> deserialize_big_int_primitive(JS::VM& vm, ReadonlySpan<u32> vector, size_t& position);

WebIDL::ExceptionOr<SerializedTransferRecord> structured_serialize_with_transfer(JS::VM& vm, JS::Value value, Vector<JS::Handle<JS::Object>> const& transfer_list);
WebIDL::ExceptionOr<DeserializedTransferRecord> structured_deserialize_with_transfer(JS::VM& vm, SerializedTransferRecord&);

}

namespace IPC {

template<>
ErrorOr<void> encode(Encoder&, ::Web::HTML::SerializedTransferRecord const&);

template<>
ErrorOr<void> encode(Encoder&, ::Web::HTML::TransferDataHolder const&);

template<>
ErrorOr<::Web::HTML::SerializedTransferRecord> decode(Decoder&);

template<>
ErrorOr<::Web::HTML::TransferDataHolder> decode(Decoder&);

}