// SPDX-FileCopyrightText: 2016 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include "common/bit_field.h"
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/swap.h"

namespace IPC {

/// Size of the command buffer area, in 32-bit words.
constexpr std::size_t COMMAND_BUFFER_LENGTH = 0x100 / sizeof(u32);

enum class ControlCommand : u32 {
    ConvertSessionToDomain = 0,
    ConvertDomainToSession = 1,
    DuplicateSession = 2,
    QueryPointerBufferSize = 3,
    DuplicateSessionEx = 4,
    Unspecified,
};

enum class CommandType : u32 {
    Invalid = 0,
    LegacyRequest = 1,
    Close = 2,
    LegacyControl = 3,
    Request = 4,
    Control = 5,
    RequestWithContext = 6,
    ControlWithContext = 7,
    TIPC_Close = 15,
    TIPC_CommandRegion = 16, // Start of TIPC commands, this is an offset.
};

struct CommandHeader {
    union {
        u32_le raw_low;
        BitField<0, 16, CommandType> type;
        BitField<16, 4, u32> num_buf_x_descriptors;
        BitField<20, 4, u32> num_buf_a_descriptors;
        BitField<24, 4, u32> num_buf_b_descriptors;
        BitField<28, 4, u32> num_buf_w_descriptors;
    };

    enum class BufferDescriptorCFlag : u32 {
        Disabled = 0,
        InlineDescriptor = 1,
        OneDescriptor = 2,
    };

    union {
        u32_le raw_high;
        BitField<0, 10, u32> data_size;
        BitField<10, 4, BufferDescriptorCFlag> buf_c_descriptor_flags;
        BitField<31, 1, u32> enable_handle_descriptor;
    };

    bool IsTipc() const {
        return type.Value() >= CommandType::TIPC_CommandRegion;
    }

    bool IsCloseCommand() const {
        switch (type.Value()) {
        case CommandType::Close:
        case CommandType::TIPC_Close:
            return true;
        default:
            return false;
        }
    }
};
static_assert(sizeof(CommandHeader) == 8, "CommandHeader size is incorrect");

union HandleDescriptorHeader {
    u32_le raw_high;
    BitField<0, 1, u32> send_current_pid;
    BitField<1, 4, u32> num_handles_to_copy;
    BitField<5, 4, u32> num_handles_to_move;
};
static_assert(sizeof(HandleDescriptorHeader) == 4, "HandleDescriptorHeader size is incorrect");

struct BufferDescriptorX {
    union {
        BitField<0, 6, u32> counter_bits_0_5;
        BitField<6, 3, u32> address_bits_36_38;
        BitField<9, 3, u32> counter_bits_9_11;
        BitField<12, 4, u32> address_bits_32_35;
        BitField<16, 16, u32> size;
    };

    u32_le address_bits_0_31;

    u32_le Counter() const {
        u32_le counter{counter_bits_0_5};
        counter |= counter_bits_9_11 << 9;
        return counter;
    }

    VAddr Address() const {
        VAddr address{address_bits_0_31};
        address |= static_cast<VAddr>(address_bits_32_35) << 32;
        address |= static_cast<VAddr>(address_bits_36_38) << 36;
        return address;
    }

    u64 Size() const {
        return static_cast<u64>(size);
    }
};
static_assert(sizeof(BufferDescriptorX) == 8, "BufferDescriptorX size is incorrect");

struct BufferDescriptorABW {
    u32_le size_bits_0_31;
    u32_le address_bits_0_31;

    union {
        BitField<0, 2, u32> flags;
        BitField<2, 3, u32> address_bits_36_38;
        BitField<24, 4, u32> size_bits_32_35;
        BitField<28, 4, u32> address_bits_32_35;
    };

    VAddr Address() const {
        VAddr address{address_bits_0_31};
        address |= static_cast<VAddr>(address_bits_32_35) << 32;
        address |= static_cast<VAddr>(address_bits_36_38) << 36;
        return address;
    }

    u64 Size() const {
        u64 size{size_bits_0_31};
        size |= static_cast<u64>(size_bits_32_35) << 32;
        return size;
    }
};
static_assert(sizeof(BufferDescriptorABW) == 12, "BufferDescriptorABW size is incorrect");

struct BufferDescriptorC {
    u32_le address_bits_0_31;

    union {
        BitField<0, 16, u32> address_bits_32_47;
        BitField<16, 16, u32> size;
    };

    VAddr Address() const {
        VAddr address{address_bits_0_31};
        address |= static_cast<VAddr>(address_bits_32_47) << 32;
        return address;
    }

    u64 Size() const {
        return static_cast<u64>(size);
    }
};
static_assert(sizeof(BufferDescriptorC) == 8, "BufferDescriptorC size is incorrect");

struct DataPayloadHeader {
    u32_le magic;
    INSERT_PADDING_WORDS_NOINIT(1);
};
static_assert(sizeof(DataPayloadHeader) == 8, "DataPayloadHeader size is incorrect");

struct DomainMessageHeader {
    enum class CommandType : u32_le {
        SendMessage = 1,
        CloseVirtualHandle = 2,
    };

    union {
        // Used when responding to an IPC request, Server -> Client.
        struct {
            u32_le num_objects;
            INSERT_PADDING_WORDS_NOINIT(3);
        };

        // Used when performing an IPC request, Client -> Server.
        struct {
            union {
                BitField<0, 8, CommandType> command;
                BitField<8, 8, u32> input_object_count;
                BitField<16, 16, u32> size;
            };
            u32_le object_id;
            INSERT_PADDING_WORDS_NOINIT(2);
        };

        std::array<u32, 4> raw;
    };
};
static_assert(sizeof(DomainMessageHeader) == 16, "DomainMessageHeader size is incorrect");

} // namespace IPC