#include "plugins/protocols/modbus_rtu/mapper/ModbusRtuProtocolMapperPlugin.h"

#include "plugins/protocols/modbus_rtu/framer/ModbusRtuFraming.h"
#include <QHash>
#include <utility>

namespace softbus::message_bus::pipeline::protocol::modbusrtu
{

namespace
{

class ModbusRtuMapperSession final : public softbus::core::plugin_system::IProtocolMapperSession
{
public:
    explicit ModbusRtuMapperSession(softbus::core::plugin_system::MapperSessionContext context)
        : m_context(std::move(context))
    {
    }

    static std::uint64_t buildCompositeKey(std::uint32_t endpointHash,
                                           softbus::core::models::ProtocolType protocol,
                                           std::uint8_t slaveId,
                                           std::uint16_t address)
    {
        return (static_cast<std::uint64_t>(endpointHash) << 32)
               | (static_cast<std::uint64_t>(static_cast<std::uint16_t>(protocol)) << 24)
               | (static_cast<std::uint64_t>(slaveId) << 16)
               | static_cast<std::uint64_t>(address);
    }

    std::vector<softbus::core::models::DOMMessage> map(
        const softbus::core::models::RawBusMessage& rawContext,
        const softbus::message_bus::pipeline::protocol::ProtocolEnvelope& envelope) override
    {
        std::vector<softbus::core::models::DOMMessage> out;
        if (envelope.family != softbus::message_bus::pipeline::protocol::ProtocolFamily::ModbusRtu) {
            return out;
        }
        const auto* pdu = std::get_if<softbus::message_bus::pipeline::protocol::ModbusRtuPdu>(&envelope.pdu);
        if (!pdu) {
            return out;
        }

        if (const auto* resp =
                std::get_if<softbus::message_bus::pipeline::protocol::ReadHoldingRegistersResponse>(pdu)) {
            out.reserve(static_cast<std::size_t>(resp->registers.size()));
            const std::uint16_t baseAddress = m_lastReadHoldingStartAddress.value(resp->unitId, 0);
            for (int i = 0; i < resp->registers.size(); ++i) {
                const auto addr = static_cast<std::uint16_t>(baseAddress + static_cast<std::uint16_t>(i));
                const auto compKey = buildCompositeKey(
                    rawContext.endpointHash, rawContext.protocol, resp->unitId, addr);
                const auto mapRule = m_context.mappingLookup ? m_context.mappingLookup->find(compKey) : std::nullopt;
                const double rawValue = static_cast<double>(resp->registers[static_cast<qsizetype>(i)]);
                if (!mapRule.has_value()) {
                    if (m_context.discoverySink) {
                        softbus::core::plugin_system::DiscoveryRecord rec;
                        rec.compositeKey = compKey;
                        rec.endpointHash = rawContext.endpointHash;
                        rec.protocol = rawContext.protocol;
                        rec.slaveId = resp->unitId;
                        rec.registerAddress = addr;
                        rec.rawValue = rawValue;
                        rec.lastSeenMs = rawContext.timestampMs;
                        m_context.discoverySink->reportUnmapped(rec);
                    }
                    // 无 metadata 映射时仍产出 DOM，便于 DynamicRuleRegistry 的 transform 等下游逻辑生效
                    // （compositeKey 仍按与映射表相同的算法计算，便于后续在 UI 里绑定映射）
                    softbus::core::models::DOMMessage pass;
                    pass.messageId = QStringLiteral("modbus.unmapped:%1").arg(compKey);
                    pass.timestamp = rawContext.timestampMs;
                    pass.value = rawValue;
                    pass.quality = softbus::core::models::DataQuality::GOOD;
                    pass.attributes.insert(QStringLiteral("sourceEndpoint"), QString::number(rawContext.endpointHash));
                    pass.attributes.insert(QStringLiteral("compositeKey"), QString::number(compKey));
                    pass.attributes.insert(QStringLiteral("slaveId"), static_cast<int>(resp->unitId));
                    pass.attributes.insert(QStringLiteral("registerAddress"), static_cast<int>(addr));
                    pass.attributes.insert(QStringLiteral("unmapped"), true);
                    out.push_back(std::move(pass));
                    continue;
                }
                softbus::core::models::DOMMessage msg;
                msg.messageId = mapRule->domPath;
                msg.timestamp = rawContext.timestampMs;
                msg.value = (rawValue * mapRule->scale) + mapRule->offset;
                msg.quality = softbus::core::models::DataQuality::GOOD;
                msg.attributes.insert(QStringLiteral("sourceEndpoint"), QString::number(rawContext.endpointHash));
                msg.attributes.insert(QStringLiteral("compositeKey"), QString::number(compKey));
                msg.attributes.insert(QStringLiteral("slaveId"), static_cast<int>(resp->unitId));
                msg.attributes.insert(QStringLiteral("registerAddress"), static_cast<int>(addr));
                if (!mapRule->unit.isEmpty()) {
                    msg.attributes.insert(QStringLiteral("unit"), mapRule->unit);
                }
                out.push_back(std::move(msg));
            }
            return out;
        }

        if (const auto* req =
                std::get_if<softbus::message_bus::pipeline::protocol::ReadHoldingRegistersRequest>(pdu)) {
            m_lastReadHoldingStartAddress.insert(req->unitId, req->startAddress);
        }
        return out;
    }

    void reset() override {}

private:
    softbus::core::plugin_system::MapperSessionContext m_context;
    QHash<std::uint8_t, std::uint16_t> m_lastReadHoldingStartAddress;
};

class ModbusRtuProtocolMapperPlugin final : public softbus::core::plugin_system::IProtocolMapperPlugin
{
public:
    QString pluginId() const override { return QStringLiteral("modbus_rtu_mapper"); }
    softbus::core::models::ProtocolType protocolType() const override
    {
        return softbus::core::models::ProtocolType::MODBUS_RTU;
    }
    std::unique_ptr<softbus::core::plugin_system::IProtocolMapperSession> createMapperSession() override
    {
        return std::make_unique<ModbusRtuMapperSession>(softbus::core::plugin_system::MapperSessionContext{});
    }
    std::unique_ptr<softbus::core::plugin_system::IProtocolMapperSession> createMapperSession(
        const softbus::core::plugin_system::MapperSessionContext& ctx) override
    {
        return std::make_unique<ModbusRtuMapperSession>(ctx);
    }
};

} // namespace

std::shared_ptr<softbus::core::plugin_system::IProtocolMapperPlugin> makeModbusRtuProtocolMapperPlugin()
{
    return std::make_shared<ModbusRtuProtocolMapperPlugin>();
}

softbus::core::plugin_system::IProtocolMapperPlugin* createModbusRtuProtocolMapperPluginRaw()
{
    return new ModbusRtuProtocolMapperPlugin();
}

} // namespace softbus::message_bus::pipeline::protocol::modbusrtu