#include "device_bus/manager/DeviceBusManager.h"

#include <chrono>
#include <memory>

#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QJsonArray>
#include <QJsonDocument>
#include <QSaveFile>
#include <QSet>
// #include <algorithm>

#include "device_bus/DeviceBus.h"
#include "message_bus/egress/EgressRouter.h"
#include "message_bus/ingress/DriverIngressAdapter.h"
#include "message_bus/pipeline/PipelineEngine.h"
#include "core/metadata/ProfileRegistry.h"
#include "message_bus/pipeline/mapping/MappingRegistry.h"
#include "message_bus/pipeline/rules/DynamicRuleRegistry.h"
#include "core/plugin_system/PluginManager.h"
#include "device_bus/manager/SerialDeviceManager.h"
#include "devices/DeviceTypes.h"
#include "utils/logs/logging.h"

namespace
{

softbus::message_bus::pipeline::RuleScope parseRuleScope(const QJsonObject& obj)
{
    softbus::message_bus::pipeline::RuleScope scope;
    scope.endpointHash = static_cast<std::uint32_t>(obj.value(QStringLiteral("endpointHash")).toInteger(0));
    scope.deviceId = obj.value(QStringLiteral("deviceId")).toInt(-1);
    scope.stableKey = obj.value(QStringLiteral("stableKey")).toString();
    return scope;
}

QString rulesConfigPath()
{
    const QString daemonConfigPath = softbus::device_bus::DeviceBus::instance().configPath();
    if (!daemonConfigPath.isEmpty()) {
        const QFileInfo fi(daemonConfigPath);
        return fi.dir().filePath(QStringLiteral("runtime_rules.json"));
    }
    return QDir::homePath() + QStringLiteral("/softbus/config/runtime_rules.json");
}

QString runtimeMappingsConfigPath()
{
    const QFileInfo fi(rulesConfigPath());
    return fi.dir().filePath(QStringLiteral("runtime_mappings.json"));
}

bool ensureConfigFileInitialized(const QString& targetPath,
                                 const QString& fallbackPath,
                                 const QByteArray& defaultContent,
                                 const char* fileLabel)
{
    if (QFile::exists(targetPath)) {
        return true;
    }
    const QFileInfo fi(targetPath);
    if (!QDir().mkpath(fi.dir().absolutePath())) {
        LOG_WARNING() << "DeviceBusManager: failed to create config directory:" << fi.dir().absolutePath();
        return false;
    }

    QByteArray initBytes = defaultContent;
    QFile fallback(fallbackPath);
    if (!fallbackPath.isEmpty() && fallback.exists() && fallback.open(QIODevice::ReadOnly)) {
        initBytes = fallback.readAll();
    }

    QSaveFile initFile(targetPath);
    if (!initFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
        LOG_WARNING() << "DeviceBusManager: failed to create" << fileLabel << "file:" << targetPath;
        return false;
    }
    if (initFile.write(initBytes) != initBytes.size()) {
        LOG_WARNING() << "DeviceBusManager: failed to initialize" << fileLabel << "file:" << targetPath;
        initFile.cancelWriting();
        return false;
    }
    if (!initFile.commit()) {
        LOG_WARNING() << "DeviceBusManager: failed to commit" << fileLabel << "file:" << targetPath;
        return false;
    }
    LOG_INFO() << "DeviceBusManager: initialized" << fileLabel << "file:" << targetPath;
    return true;
}

void ensureCoreConfigFilesInitialized()
{
    const QFileInfo rulesFi(rulesConfigPath());
    const QString baseDir = rulesFi.dir().absolutePath();

    const QByteArray defaultRules = QJsonDocument(QJsonObject{
        {QStringLiteral("filter"), QJsonArray{}},
        {QStringLiteral("transform"), QJsonArray{}},
    }).toJson(QJsonDocument::Indented);
    (void)ensureConfigFileInitialized(rulesConfigPath(),
                                      QStringLiteral(),
                                      defaultRules,
                                      "runtime_rules");

    const QByteArray defaultMappings = QStringLiteral(
        "{\n  \"catalogVersion\": 1,\n  \"items\": []\n}\n")
                                          .toUtf8();
    (void)ensureConfigFileInitialized(runtimeMappingsConfigPath(),
                                      QStringLiteral(),
                                      defaultMappings,
                                      "runtime_mappings");

    const QString profilesPath = QDir(baseDir).filePath(QStringLiteral("device_profiles.json"));
    const QByteArray defaultProfiles = QStringLiteral(
        "{\n  \"catalogVersion\": \"\",\n  \"profiles\": []\n}\n")
                                          .toUtf8();
    (void)ensureConfigFileInitialized(profilesPath,
                                      QStringLiteral("config/device_profiles.json"),
                                      defaultProfiles,
                                      "device_profiles");

    const QString metadataPath = QDir(baseDir).filePath(QStringLiteral("metadata_dictionary.json"));
    const QByteArray defaultMetadata = QStringLiteral(
        "{\n  \"catalogVersion\": \"\",\n  \"metadatas\": []\n}\n")
                                          .toUtf8();
    (void)ensureConfigFileInitialized(metadataPath,
                                      QStringLiteral("config/metadata_dictionary.json"),
                                      defaultMetadata,
                                      "metadata_dictionary");
}

void loadRuntimeMappingsFromDedicatedConfig()
{
    const QString path = runtimeMappingsConfigPath();
    if (!softbus::message_bus::pipeline::MappingRegistry::instance().loadPersistedFile(path)) {
        LOG_WARNING() << "DeviceBusManager: failed to load runtime_mappings from" << path;
    } else {
        LOG_INFO() << "DeviceBusManager: loaded runtime_mappings from" << path;
    }
}

void loadProfileCatalogSingleton()
{
    const QString dir = QFileInfo(rulesConfigPath()).dir().absolutePath();
    const QString profilePath = QDir(dir).filePath(QStringLiteral("device_profiles.json"));
    if (!softbus::core::metadata::ProfileRegistry::instance().loadFromFile(profilePath)) {
        LOG_WARNING() << "DeviceBusManager: profile catalog load failed path=" << profilePath
                      << "err=" << softbus::core::metadata::ProfileRegistry::instance().lastError();
    } else {
        LOG_INFO() << "DeviceBusManager: loaded device_profiles from" << profilePath;
    }
}

void loadDynamicRulesFromDedicatedConfig()
{
    auto& reg = softbus::message_bus::pipeline::DynamicRuleRegistry::instance();
    const QString path = rulesConfigPath();
    QFile file(path);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        LOG_WARNING() << "DeviceBusManager: failed to open rules config:" << path;
        return;
    }
    QJsonParseError pe;
    const QJsonDocument doc = QJsonDocument::fromJson(file.readAll(), &pe);
    if (pe.error != QJsonParseError::NoError || !doc.isObject()) {
        LOG_WARNING() << "DeviceBusManager: invalid rules config json:" << path << "err=" << pe.errorString();
        return;
    }

    const QJsonObject rulesObj = doc.object();
    const QJsonArray filterRules = rulesObj.value(QStringLiteral("filter")).toArray();
    const QJsonArray transformRules = rulesObj.value(QStringLiteral("transform")).toArray();
    int loadedFilterCount = 0;
    for (const auto& item : filterRules) {
        const QJsonObject obj = item.toObject();
        softbus::message_bus::pipeline::FilterRule rule;
        rule.id = obj.value(QStringLiteral("id")).toString();
        rule.scope = parseRuleScope(obj.value(QStringLiteral("scope")).toObject());
        rule.condition = obj.value(QStringLiteral("condition")).toObject();
        if (!rule.id.isEmpty()) {
            (void)reg.addFilterRule(rule);
            ++loadedFilterCount;
        }
    }

    int loadedTransformCount = 0;
    for (const auto& item : transformRules) {
        const QJsonObject obj = item.toObject();
        softbus::message_bus::pipeline::TransformRule rule;
        rule.id = obj.value(QStringLiteral("id")).toString();
        rule.scope = parseRuleScope(obj.value(QStringLiteral("scope")).toObject());
        rule.scale = obj.value(QStringLiteral("scale")).toDouble(1.0);
        rule.offset = obj.value(QStringLiteral("offset")).toDouble(0.0);
        rule.unit = obj.value(QStringLiteral("unit")).toString();
        if (!rule.id.isEmpty()) {
            (void)reg.addTransformRule(rule);
            ++loadedTransformCount;
        }
    }
    LOG_INFO() << "DeviceBusManager: loaded dynamic rules from" << path
               << "filter=" << loadedFilterCount
               << "transform=" << loadedTransformCount;
}

} // namespace

DeviceBusManager::~DeviceBusManager()
{
    shutdown();
}

void DeviceBusManager::setDeviceTreeModel(std::shared_ptr<DeviceTreeModel> model)
{
    m_treeModel = std::move(model);
}

void DeviceBusManager::setRegistry(softbus::device_bus::registry::IDeviceRegistry* registry)
{
    m_registry = registry;
}

void DeviceBusManager::setDirtyCallback(std::function<void()> cb)
{
    m_dirtyCb = std::move(cb);
}

bool DeviceBusManager::initialize(const QJsonObject& rootConfig)
{
    // 初始化内存池、pipeline引擎、插件管理器、ingress适配器、egress路由器
    // 内存池是用来存储数据块的
    // pipeline引擎是用来处理数据流的
    // 插件管理器是用来管理插件的
    // ingress适配器是用来将数据推送到 ingress 队列的
    // egress路由器是用来将数据从 ingress 队列中取出并发送给设备的
    // 内存池大小为4096，每个数据块大小为4096
    // pipeline引擎队列大小为4096
    // 插件管理器插件数量为4096
    // ingress适配器队列大小为4096
    // egress路由器队列大小为4096
    if (!m_memoryPool) {
        m_memoryPool = std::make_shared<softbus::core::memory::MemoryPool>(4096, 4096);
    }
    if (!m_pipelineEngine) {
        m_pipelineEngine = std::make_unique<softbus::message_bus::pipeline::PipelineEngine>(4096);
    }
    if (!m_pluginManager) {
        m_pluginManager = std::make_shared<softbus::core::plugin_system::PluginManager>();
    }
    if (!m_pluginHost) {
        m_pluginHost = std::make_unique<softbus::core::plugin_system::PluginHost>(m_pluginManager);
    }
    const auto pluginsObj = rootConfig.value(QStringLiteral("plugins")).toObject();
    QSet<QString> loadedPluginPaths;
    auto loadPlugins = [&](const QJsonArray& arr, const char* sourceTag) {
        for (const auto& v : arr) {
            const auto obj = v.toObject();
            const QString path = obj.value(QStringLiteral("path")).toString();
            if (path.isEmpty() || loadedPluginPaths.contains(path)) {
                continue;
            }
            QString err;
            if (!m_pluginHost->loadPlugin(path, &err)) {
                LOG_WARNING() << "DeviceBusManager: plugin load failed source=" << sourceTag
                              << "path=" << path << "err=" << err;
                continue;
            }
            loadedPluginPaths.insert(path);
        }
    };
    // New generic entry for protocol plugins; each .so may export parser/framer/mapper factories.
    loadPlugins(pluginsObj.value(QStringLiteral("protocols")).toArray(), "protocols");
    // Backward compatibility: legacy key still supported.
    loadPlugins(pluginsObj.value(QStringLiteral("framers")).toArray(), "framers");
    if (m_pluginManager) {
        const auto parserIds = m_pluginManager->registeredProtocolPluginIds();
        const auto framerIds = m_pluginManager->registeredProtocolFramerPluginIds();
        const auto mapperIds = m_pluginManager->registeredProtocolMapperPluginIds();
        LOG_INFO() << "DeviceBusManager: registered parser plugins(" << parserIds.size()
                   << "):" << parserIds.join(QStringLiteral(", "));
        LOG_INFO() << "DeviceBusManager: registered framer plugins(" << framerIds.size()
                   << "):" << framerIds.join(QStringLiteral(", "));
        LOG_INFO() << "DeviceBusManager: registered mapper plugins(" << mapperIds.size()
                   << "):" << mapperIds.join(QStringLiteral(", "));
    }
    if (m_pipelineEngine) {
        m_pipelineEngine->setMemoryPool(m_memoryPool);
        m_pipelineEngine->loadRuntimeConfigFromJson(rootConfig.value(QStringLiteral("pipeline")).toObject());
        m_pipelineEngine->setPluginManager(m_pluginManager);
        ensureCoreConfigFilesInitialized();
        loadDynamicRulesFromDedicatedConfig();
        loadRuntimeMappingsFromDedicatedConfig();
        loadProfileCatalogSingleton();
        m_pipelineEngine->start();
    }
    if (!m_ingressAdapter) {
        m_ingressAdapter = std::make_unique<softbus::message_bus::ingress::DriverIngressAdapter>(
            m_memoryPool, m_pipelineEngine.get());
    }
    if (!m_egressRouter) {
        m_egressRouter = std::make_unique<softbus::message_bus::egress::EgressRouter>();
    }
    if (!m_egressRunning.exchange(true)) {
        m_egressThread = std::thread([this]() { this->processEgressLoop(); });
    }

    if (!m_treeModel) {
        m_treeModel = std::make_shared<DeviceTreeModel>();
    }

    // 加载设备树
    QString treeError;
    if (!m_treeModel->loadFromDaemonConfig(rootConfig, &treeError)) {
        LOG_ERROR() << "DeviceBusManager: failed to load device_tree:" << treeError;
        return false;
    }

    const auto nodes = m_treeModel->nodes();
    for (const auto& n : nodes) {
        if (!n.enabled) continue;

        auto kind = softbus::devices::kindFromType(n.type);
        if (kind == softbus::devices::DeviceKind::Unknown) {
            kind = softbus::devices::inferDeviceKindFromEndpoint(n.endpoint);
        }

        if (kind == softbus::devices::DeviceKind::Serial) {
            initializeSerialDevice(n.endpoint, n.params);
            m_deviceEndpointsMap.insert(n.endpoint, kind);
        } else {
            LOG_WARNING() << "DeviceBusManager: skip unsupported kind for endpoint=" << n.endpoint
                          << "type=" << n.type;
        }
    }

    return true;
}

bool DeviceBusManager::reconcileFromTreeModel()
{
    if (!m_treeModel) {
        return false;
    }

    QSet<QString> desiredSerialEndpoints;
    const auto nodes = m_treeModel->nodes();
    for (const auto& n : nodes) {
        if (!n.enabled) continue;
        if (!n.params.value(QStringLiteral("online")).toBool(true)) continue;

        auto kind = softbus::devices::kindFromType(n.type);
        if (kind == softbus::devices::DeviceKind::Unknown) {
            kind = softbus::devices::inferDeviceKindFromEndpoint(n.endpoint);
        }

        if (kind == softbus::devices::DeviceKind::Serial) {
            desiredSerialEndpoints.insert(n.endpoint);
            if (!m_serialDevicesByEndpointSharedPtr.contains(n.endpoint)) {
                initializeSerialDevice(n.endpoint, n.params);
            }
            m_deviceEndpointsMap.insert(n.endpoint, kind);
        }
    }

    // Remove runtime devices that are no longer desired/offline
    const auto currentKeys = m_serialDevicesByEndpointSharedPtr.keys();
    for (const auto& endpoint : currentKeys) {
        if (!desiredSerialEndpoints.contains(endpoint)) {
            shutdownSerialDevice(endpoint);
            m_deviceEndpointsMap.remove(endpoint);
        }
    }

    return true;
}

void DeviceBusManager::shutdown()
{
    m_egressRunning.store(false);
    if (m_egressThread.joinable()) {
        m_egressThread.join();
    }

    // 关闭并销毁所有串口设备
    const auto keys = m_serialDevicesByEndpointSharedPtr.keys();
    for (const auto& endpoint : keys) {
        shutdownSerialDevice(endpoint);
    }
    if (m_pipelineEngine) {
        m_pipelineEngine->stop();
        m_pipelineEngine->drain();
    }
}

std::vector<softbus::devices::DeviceInfo> DeviceBusManager::listDevices() const
{
    if (!m_registry) {
        return {};
    }
    return m_registry->listDevices();
}

std::optional<softbus::devices::DeviceInfo> DeviceBusManager::findDeviceById(int id) const
{
    if (!m_registry) {
        return std::nullopt;
    }
    return m_registry->findById(id);
}

softbus::message_bus::pipeline::PipelineEngine* DeviceBusManager::pipelineEngine() const
{
    return m_pipelineEngine.get();
}

std::shared_ptr<softbus::core::plugin_system::PluginManager> DeviceBusManager::pluginManager() const
{
    return m_pluginManager;
}

void DeviceBusManager::initializeSerialDevice(const QString& endpoint, const QJsonObject& params)
{
    softbus::device_bus::manager::SerialInitDeps deps;
    deps.treeModel = m_treeModel.get();
    deps.dirtyCb = m_dirtyCb;
    deps.registry = m_registry;
    deps.ingressAdapter = m_ingressAdapter.get();
    deps.memoryPool = m_memoryPool;
    deps.egressRouter = m_egressRouter.get();
    deps.serialDevicesByEndpoint = &m_serialDevicesByEndpointSharedPtr;
    (void)softbus::device_bus::manager::initializeSerialDeviceWithDeps(endpoint, params, deps);
}

void DeviceBusManager::shutdownSerialDevice(const QString& endpoint)
{
    auto it = m_serialDevicesByEndpointSharedPtr.find(endpoint);
    if (it == m_serialDevicesByEndpointSharedPtr.end()) {
        return;
    }

    auto device = it.value();
    if (device) {
        auto info = device->deviceInfo();
        if (m_registry && info.id >= 0) {
            m_registry->unregisterDevice(info.id);
        }
        device->stop();
    }
    if (m_egressRouter) {
        m_egressRouter->unbindSerialDevice(endpoint);
    }

    m_serialDevicesByEndpointSharedPtr.erase(it);
}

void DeviceBusManager::processEgressLoop()
{
    while (m_egressRunning.load()) {
        if (!m_pipelineEngine || !m_egressRouter) {
            std::this_thread::sleep_for(std::chrono::milliseconds(2));
            continue;
        }

        softbus::core::models::RawBusMessage out;
        if (!m_pipelineEngine->tryPopEgress(out)) {
            std::this_thread::sleep_for(std::chrono::milliseconds(1));
            continue;
        }
        const bool ok = m_egressRouter->send(out);
        if (!ok) {
            // LOG_WARNING() << "DeviceBusManager: egress send failed endpoint=" << out.endpoint;
        }
    }
}