#include "ModuleCommunication.h"
#include "BoostLog.h"
#include "StringUtility.h"
#include <WinSock2.h>
#include <mbedtls/md5.h>
#include <sstream>

static inline uint8_t xor_checksum_byte(const uint8_t *data, uint32_t len) {
    uint8_t sum = 0;
    for (uint32_t i = 0; i < len; ++i) {
        sum ^= data[i];
    }
    return sum;
}

ModuleCommunication::ModuleCommunication(QObject *parent) : QObject{parent} {
}

bool ModuleCommunication::open(const QString &portName, int baudRate) {
    bool ret = true;
    m_serialPort = std::make_shared<QSerialPort>(portName);
    m_serialPort->setBaudRate(baudRate);
    connect(m_serialPort.get(), &QSerialPort::readyRead, this, &ModuleCommunication::onReadyRead);
    connect(m_serialPort.get(), &QSerialPort::errorOccurred, this, &ModuleCommunication::onErrorOccurred);

    ret = m_serialPort->open(QSerialPort::ReadWrite);
    LOG_CAT(info, GUI) << "打开串口(" << portName.toStdString() << ")" << (ret ? "成功" : "失败")
                       << ", 波特率: " << baudRate;
    if (!ret) {
        LOG(error) << m_serialPort->errorString().toStdString();
    }
    LOG_CAT(info, GUI) << Separator;
    return ret;
}

void ModuleCommunication::verify(uint8_t timeout) {
    VerifyInfo data = {0};
    data.timeout = timeout;

    auto [frameData, frameSize] = generateFrame(Verify, reinterpret_cast<const uint8_t *>(&data), sizeof(data));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    m_currentMessageId = Verify;
    emit commandStarted(Verify);

    LOG_CAT(info, GUI) << "发送识别指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::reset() {
    auto [frameData, frameSize] = generateFrame(Reset);
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    LOG_CAT(info, GUI) << "发送复位指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::enroll(const std::string &username, uint8_t timeout) {
    EnrollData data = {0};
    data.timeout = timeout;
    strncpy(reinterpret_cast<char *>(data.username), username.c_str(), sizeof(data.username));
    auto [frameData, frameSize] = generateFrame(EnrollSingle, reinterpret_cast<const uint8_t *>(&data), sizeof(data));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    m_currentMessageId = EnrollSingle;
    emit commandStarted(EnrollSingle);

    LOG_CAT(info, GUI) << "发送注册指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << "用户名: " << username << ", 超时时间: " << static_cast<int>(timeout) << "s";
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::enrollEx(const std::string &username, uint8_t timeout) {
    EnrollData data = {0};
    data.timeout = timeout;
    strncpy(reinterpret_cast<char *>(data.username), username.c_str(), sizeof(data.username));
    auto [frameData, frameSize] = generateFrame(EnrollGetImage, reinterpret_cast<const uint8_t *>(&data), sizeof(data));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);

    LOG_CAT(info, GUI) << "发送获取注册照片指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << "用户名: " << username << ", 超时时间: " << static_cast<int>(timeout) << "s";
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::deleteUser(uint16_t userid) {
    uint16_t n = htons(userid);
    auto [frameData, frameSize] = generateFrame(DeleteUser, reinterpret_cast<const uint8_t *>(&n), sizeof(n));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    m_currentMessageId = DeleteUser;
    emit commandStarted(DeleteUser);
    LOG_CAT(info, GUI) << "发送删除用户指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << "删除用户ID: " << userid;
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::deleteAll() {
    auto [frameData, frameSize] = generateFrame(DeleteAll);
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    m_currentMessageId = DeleteAll;
    emit commandStarted(DeleteAll);
    LOG_CAT(info, GUI) << "发送删除所有指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::requestEnrolledImage(uint32_t offset, uint32_t size) {
    ImageSliceRequest request;
    request.offset = htonl(offset);
    request.size = htonl(size);
    auto [data, frameSize] =
        generateFrame(GetEnrolledImage, reinterpret_cast<const uint8_t *>(&request), sizeof(request));
    m_serialPort->write(reinterpret_cast<const char *>(data), frameSize);
    LOG_CAT(info, GUI) << "发送获取图片指令: " << protocolDataFormatString(data, frameSize);
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::requestPalmFeature(uint16_t userid) {
    uint16_t n = htons(userid);
    auto [frameData, frameSize] = generateFrame(RequestPalmFeature, reinterpret_cast<const uint8_t *>(&n), sizeof(n));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    LOG_CAT(info, GUI) << "发送获取掌静脉特征值指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << "获取特征值用户ID: " << userid;
    LOG_CAT(info, GUI) << Separator;
}

void ModuleCommunication::enrollPalmFeature(uint16_t userid, const PalmFeature &feature) {
    auto buffer = new uint8_t[sizeof(PalmFeatureHeader) + feature.feature.size()];
    auto header = reinterpret_cast<PalmFeatureHeader *>(buffer);
    header->userid = htons(userid);
    header->featureTotalSize = htons(static_cast<uint16_t>(feature.feature.size()));
    strncpy(reinterpret_cast<char *>(header->username), feature.username.c_str(), sizeof(header->username));

    mbedtls_md5_context context;
    mbedtls_md5_init(&context);
    mbedtls_md5_starts(&context);
    uint8_t md5[16];
    mbedtls_md5_update(&context, feature.feature.data(), feature.feature.size());
    mbedtls_md5_finish(&context, md5);
    mbedtls_md5_free(&context);
    memcpy(header->featureDataMd5, md5, sizeof(header->featureDataMd5));

    memcpy(buffer + sizeof(PalmFeatureHeader), feature.feature.data(), feature.feature.size());

    auto [frameData, frameSize] = generateFrame(
        RegisterPalmFeature, buffer, static_cast<uint16_t>(sizeof(PalmFeatureHeader) + feature.feature.size()));
    m_serialPort->write(reinterpret_cast<const char *>(frameData), frameSize);
    LOG_CAT(info, GUI) << "发送注册掌静脉特征指令: " << protocolDataFormatString(frameData, frameSize);
    LOG_CAT(info, GUI) << Separator;

    if (buffer != nullptr) delete[] buffer;
}

ModuleCommunication::MessageId ModuleCommunication::currentMessageId() const {
    return m_currentMessageId;
}

void ModuleCommunication::processPackage(const uint8_t *data, uint16_t size) {
    uint8_t messageId = data[2];
    switch (messageId) {
    case Reply: {
        uint8_t replyId = data[5];
        auto result = data[6];
        switch (replyId) {
        case Reset: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                LOG_CAT(info, GUI) << "复位完成。";
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case Verify: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                auto info = reinterpret_cast<const VerifyDataReply *>(data + 7);
                uint16_t userid = ntohs(info->userid);
                LOG_CAT(info, GUI) << "用户ID: " << userid
                                   << ", 用户名: " << std::string_view(reinterpret_cast<const char *>(info->username));
                emit newVerifyResult(userid, reinterpret_cast<const char *>(info->username));
            } else if (result == Failed4Timeout) {
                LOG_CAT(info, GUI) << "识别超时。";
            } else if (result == Rejected) {
                LOG_CAT(info, GUI) << "模组拒绝该命令。";
            } else if (result == Failed4UnknownUser) {
                LOG_CAT(info, GUI) << "未录入用户。";
                emit newVerifyResult(InvalidUserId, "");
            } else if (result == Failed4UnknownReason) {
                LOG_CAT(info, GUI) << "未知错误。";
                emit newVerifyResult(InvalidUserId, "");
            } else {
                LOG_CAT(info, GUI) << "未知错误(" << static_cast<int>(result) << ")。";
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case EnrollSingle: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                auto info = reinterpret_cast<const EnrollDataReply *>(data + 7);
                LOG_CAT(info, GUI) << "注册成功,用户ID: " << ntohs(info->userid);
            } else if (result == Failed4Timeout) {
                LOG_CAT(info, GUI) << "识别超时。";
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case EnrollGetImage: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                auto info = reinterpret_cast<const EnrolledImageReply *>(data + 7);
                uint16_t width = ntohs(info->width);
                uint16_t height = ntohs(info->height);
                LOG_CAT(info, GUI) << "图片大小: " << width << "x" << height;
                emit newEnrolledImageInfo(width * height, info->md5);
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case GetEnrolledImage: {
            // LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                auto info = reinterpret_cast<const ImageSliceReply *>(data + 7);
                emit newImageSliceData(std::vector<uint8_t>(info->data, info->data + ntohl(info->size)));
            }
            // LOG_CAT(info, GUI) << Separator;
            break;
        }
        case DeleteUser: {
            if (result == Success) {
                LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
                LOG_CAT(info, GUI) << "删除用户成功。";
                LOG_CAT(info, GUI) << Separator;
            } else {
                LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
                LOG_CAT(info, GUI) << "删除用户失败。";
                LOG_CAT(info, GUI) << Separator;
            }
            break;
        }
        case DeleteAll: {
            if (result == Success) {
                LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
                LOG_CAT(info, GUI) << "删除所有用户成功。";
                LOG_CAT(info, GUI) << Separator;
            }
            break;
        }
        case RequestPalmFeature: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                auto info = reinterpret_cast<const PalmFeatureHeader *>(data + 7);
                LOG_CAT(info, GUI) << "用户ID: " << ntohs(info->userid)
                                   << ", 用户名: " << std::string_view(reinterpret_cast<const char *>(info->username))
                                   << ", 特征值长度: " << ntohs(info->featureTotalSize);
                PalmFeature feature;
                feature.username = std::string_view(reinterpret_cast<const char *>(info->username));
                feature.feature = std::vector<uint8_t>(info->feature, info->feature + ntohs(info->featureTotalSize));
                emit newPalmFeature(feature);
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case RegisterPalmFeature: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            if (result == Success) {
                LOG_CAT(info, GUI) << "掌静脉特征值注册成功。";
            }
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        default:
            LOG(warning) << "unknown reply command: 0x" << (static_cast<int>(replyId) & 0xff)
                         << ", data: " << protocolDataFormatString(data, size);
            break;
        }
        m_currentMessageId = Idle;
        emit commandFinished(static_cast<MessageId>(replyId), static_cast<MessageStatus>(result));
        break;
    }
    case Note: {
        uint8_t noteId = data[5];
        switch (noteId) {
        case Ready: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            LOG_CAT(info, GUI) << "模组上电初始化成功。";
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        case PalmState: { // 模组返回的数据为当前帧的手掌状态
            break;
        }
        case UnknownError: {
            LOG_CAT(info, GUI) << "模组: " << protocolDataFormatString(data, size);
            LOG_CAT(info, GUI) << "未知错误。";
            LOG_CAT(info, GUI) << Separator;
            break;
        }
        default:
            LOG(warning) << "unknown note command: 0x" << (static_cast<int>(noteId) & 0xff)
                         << ", data: " << protocolDataFormatString(data, size);
            break;
        }

        break;
    }
    default:
        LOG(warning) << "unknown command: 0x" << (static_cast<int>(data[2]) & 0xff)
                     << ", data: " << protocolDataFormatString(data, size);
        break;
    }
}

void ModuleCommunication::onReadyRead() {
    // LOG(info) << "ModuleCommunication::onReadyRead";
    m_receivedBuffer.append(m_serialPort->readAll());
    while (m_receivedBuffer.size() >= 2) {
        int beginIndex = -1;
        for (int i = 0; i < m_receivedBuffer.size() - 1; i++) {
            if (static_cast<uint8_t>(m_receivedBuffer[i]) == 0xEF &&
                static_cast<uint8_t>(m_receivedBuffer[i + 1]) == 0xAA) {
                beginIndex = i;
                break;
            }
        }
        if (beginIndex < 0) {
            m_receivedBuffer.clear();
            break;
        } else if (beginIndex != 0) {
            m_receivedBuffer.remove(0, beginIndex);
            beginIndex = 0;
        }

        if (m_receivedBuffer.size() < 5) break;
        uint16_t packageSize = *reinterpret_cast<uint16_t *>(m_receivedBuffer.data() + 3);
        packageSize = ntohs(packageSize);

        uint16_t totalSize = 0;
        if (packageSize == 0) {
            totalSize = 6;
        } else {
            totalSize = packageSize + 6;
        }
        if (m_receivedBuffer.size() >= totalSize) {
            processPackage(reinterpret_cast<const uint8_t *>(m_receivedBuffer.data()), totalSize);
            m_receivedBuffer.remove(0, totalSize);
        } else {
            break;
        }
    }
}

void ModuleCommunication::onErrorOccurred(QSerialPort::SerialPortError error) {
    if (error == QSerialPort::NoError) return;
    LOG_CAT(info, GUI) << m_serialPort->portName().toStdString() << ": " << m_serialPort->errorString().toStdString();
    emit errorOccurred(m_serialPort->errorString());
}

std::pair<uint8_t *, uint32_t> ModuleCommunication::generateFrame(MessageId command, const uint8_t *data,
                                                                  uint16_t size) {
    static uint8_t sendBuffer[1024] = {0};
    memset(sendBuffer, 0, sizeof(sendBuffer));
    sendBuffer[0] = 0xef;
    sendBuffer[1] = 0xaa;
    sendBuffer[2] = command;
    sendBuffer[3] = size >> 8;
    sendBuffer[4] = size & 0xff;
    if (size > 0) {
        memcpy(sendBuffer + 5, data, size);
    }
    sendBuffer[5 + size] = xor_checksum_byte(sendBuffer + 2, 3 + size);
    return std::make_pair(sendBuffer, size + 6);
}

std::string ModuleCommunication::protocolDataFormatString(const uint8_t *data, int size) {
    std::ostringstream oss;
    for (int i = 0; i < size; i++) {
        oss << "0x" << std::setfill('0') << std::setw(2) << std::hex << (static_cast<int>(data[i]) & 0xff) << " ";
    }
    return oss.str();
}