#include "Sqbase.h"
#include <QCoreApplication>
#include <QDateTime>
#include <QDebug>

namespace Sqbase {

// Static variables for singleton management
static QTradeCore* s_core = nullptr;
static SystemStatus s_systemStatus = SystemStatus::Uninitialized;
static SystemConfig s_systemConfig;

// Core system access
QTradeCore* System::core() {
    return s_core;
}

// Data layer access
QDataBuffer* System::dataBuffer() {
    return s_core ? s_core->dataBuffer() : nullptr;
}

QDataQuality* System::dataQuality() {
    return s_core ? s_core->dataQuality() : nullptr;
}

QOrderProcessor* System::orderProcessor() {
    return s_core ? s_core->orderProcessor() : nullptr;
}

QBigOrderManager* System::bigOrderManager() {
    return s_core ? s_core->bigOrderManager() : nullptr;
}

// Network layer access
QFaultTolerance* System::faultTolerance() {
    return s_core ? s_core->faultTolerance() : nullptr;
}

QSubscriptionManager* System::subscriptionManager() {
    return s_core ? s_core->subscriptionManager() : nullptr;
}

// Configuration layer access
QConfigManager* System::configManager() {
    return s_core ? s_core->configManager() : nullptr;
}

QLogManager* System::logManager() {
    return s_core ? s_core->logManager() : nullptr;
}

// Utility layer access
QEventBus* System::eventBus() {
    return s_core ? s_core->eventBus() : nullptr;
}

// System control
bool System::initialize(const SystemConfig& config, int flags) {
    if (s_systemStatus != SystemStatus::Uninitialized && 
        s_systemStatus != SystemStatus::Stopped) {
        qWarning() << "System is already initialized or in process";
        return false;
    }
    
    s_systemStatus = SystemStatus::Initializing;
    s_systemConfig = config;
    
    try {
        // Initialize core system
        s_core = QTradeCore::instance();
        if (!s_core) {
            throw std::runtime_error("Failed to create core system instance");
        }
        
        // Apply configuration
        if (configManager()) {
            configManager()->setBufferSize(config.bufferSize);
            configManager()->setMaxPacketsPerSecond(config.maxPacketsPerSecond);
            configManager()->setMonitorInterval(config.heartbeatInterval);
        }
        
        // Initialize components based on flags
        if (flags & InitDataBuffer && dataBuffer()) {
            dataBuffer()->setBufferSize(config.bufferSize);
            dataBuffer()->setMaxPacketsPerSecond(config.maxPacketsPerSecond);
            dataBuffer()->setFlowControlEnabled(true);
        }
        
        if (flags & InitDataQuality && dataQuality()) {
            dataQuality()->enableAlerts(config.enableDataValidation);
        }
        
        if (flags & InitFaultTolerance && faultTolerance()) {
            faultTolerance()->enableFaultTolerance(config.enableFaultTolerance);
            
            HeartbeatConfig hbConfig;
            hbConfig.intervalMs = config.heartbeatInterval;
            faultTolerance()->setHeartbeatConfig(hbConfig);
            
            ReconnectConfig rcConfig;
            rcConfig.maxAttempts = config.reconnectAttempts;
            faultTolerance()->setReconnectConfig(rcConfig);
        }
        
        if (flags & InitConfigManager && configManager()) {
            configManager()->loadDefaults();
        }
        
        s_systemStatus = SystemStatus::Running;
        qInfo() << "Sqbase system initialized successfully";
        return true;
        
    } catch (const std::exception& e) {
        s_systemStatus = SystemStatus::Error;
        qCritical() << "Failed to initialize Sqbase system:" << e.what();
        return false;
    }
}

void System::shutdown() {
    if (s_systemStatus == SystemStatus::Stopped || 
        s_systemStatus == SystemStatus::Uninitialized) {
        return;
    }
    
    s_systemStatus = SystemStatus::Stopping;
    
    try {
        // Shutdown core system
        if (s_core) {
            s_core->shutdown();
        }
        
        s_systemStatus = SystemStatus::Stopped;
        qInfo() << "Sqbase system shutdown completed";
        
    } catch (const std::exception& e) {
        s_systemStatus = SystemStatus::Error;
        qCritical() << "Error during system shutdown:" << e.what();
    }
}

SystemStatus System::status() {
    return s_systemStatus;
}

QString System::statusString() {
    switch (s_systemStatus) {
        case SystemStatus::Uninitialized: return "Uninitialized";
        case SystemStatus::Initializing: return "Initializing";
        case SystemStatus::Running: return "Running";
        case SystemStatus::Degraded: return "Degraded";
        case SystemStatus::Stopping: return "Stopping";
        case SystemStatus::Stopped: return "Stopped";
        case SystemStatus::Error: return "Error";
        default: return "Unknown";
    }
}

// System information
QString System::version() {
    return "1.0.0";
}

QDateTime System::buildTime() {
    return QDateTime::fromString(__DATE__ " " __TIME__, "MMM d yyyy hh:mm:ss");
}

QString System::systemInfo() {
    QString info;
    info += "Sqbase Trading System\n";
    info += "Version: " + version() + "\n";
    info += "Build Time: " + buildTime().toString("yyyy-MM-dd hh:mm:ss") + "\n";
    info += "Status: " + statusString() + "\n";
    
    if (s_core && s_core->isInitialized()) {
        info += "Core System: Initialized\n";
        
        if (dataBuffer()) {
            auto stats = dataBuffer()->getStatistics();
            info += QString("Data Buffer: %1 packets, %2 p/s\n")
                   .arg(stats.totalPackets)
                   .arg(stats.packetsPerSecond, 0, 'f', 2);
        }
        
        if (dataQuality()) {
            auto metrics = dataQuality()->getOverallMetrics();
            info += QString("Data Quality: %.1f%% complete, %.1f%% accurate\n")
                   .arg(metrics.completeness)
                   .arg(metrics.accuracy);
        }
        
        if (faultTolerance()) {
            info += QString("Fault Tolerance: %1\n")
                   .arg(faultTolerance()->isSystemHealthy() ? "Healthy" : "Degraded");
        }
    } else {
        info += "Core System: Not Initialized\n";
    }
    
    return info;
}

} // namespace Sqbase

// Convenience global functions for quick access
Sqbase::QTradeCore* SqCore() {
    return Sqbase::System::core();
}

Sqbase::QDataBuffer* SqDataBuffer() {
    return Sqbase::System::dataBuffer();
}

Sqbase::QDataQuality* SqDataQuality() {
    return Sqbase::System::dataQuality();
}

Sqbase::QFaultTolerance* SqFaultTolerance() {
    return Sqbase::System::faultTolerance();
}

Sqbase::QConfigManager* SqConfigManager() {
    return Sqbase::System::configManager();
}