// ------------------------------------------------------------------------------------------------
#include "Core.hpp"
#include "Logger.hpp"
#include "Misc/Signal.hpp"
#include "Misc/Areas.hpp"
#include "Base/Buffer.hpp"
#include "Library/Utils/Buffer.hpp"

// ------------------------------------------------------------------------------------------------
#include "Entity/Blip.hpp"
#include "Entity/Checkpoint.hpp"
#include "Entity/Keybind.hpp"
#include "Entity/Object.hpp"
#include "Entity/Pickup.hpp"
#include "Entity/Player.hpp"
#include "Entity/Vehicle.hpp"

// ------------------------------------------------------------------------------------------------
#include <SqMod.h>
#include <sqstdio.h>
#include <sqstdblob.h>
#include <sqstdmath.h>
#include <sqstdsystem.h>
#include <sqstdstring.h>
#include <SimpleIni.h>

// ------------------------------------------------------------------------------------------------
#include <cstdio>
#include <cstdarg>
#include <exception>
#include <stdexcept>
#include <algorithm>

// ------------------------------------------------------------------------------------------------
namespace SqMod {

// ------------------------------------------------------------------------------------------------
extern bool RegisterAPI(HSQUIRRELVM vm);

// ------------------------------------------------------------------------------------------------
extern void InitializeTasks();
extern void InitializeRoutines();
extern void TerminateAreas();
extern void TerminateTasks();
extern void TerminatePrivileges();
extern void TerminateRoutines();
extern void TerminateCommands();
extern void TerminateSignals();

// ------------------------------------------------------------------------------------------------
extern Buffer GetRealFilePath(CSStr path);

/* ------------------------------------------------------------------------------------------------
 * Loader used to process a section from the configuration file and look for scripts to load.
*/
class ScriptLoader
{
    // --------------------------------------------------------------------------------------------
    CSimpleIniA & m_Config; // The processed configuration.

public:

    /* --------------------------------------------------------------------------------------------
     * Default constructor.
    */
    explicit ScriptLoader(CSimpleIniA & conf)
        : m_Config(conf)
    {
        /* ... */
    }

    /* --------------------------------------------------------------------------------------------
     * Function call operator.
    */
    bool operator () (CCStr key, CCStr val) const
    {
        // Validate the specified key
        if (!key || *key == '\0')
        {
            return true; // Move to the next element!
        }
        // Identify the load option
        if (std::strcmp(key, "Section") == 0)
        {
            return m_Config.ProcAllValues(val, ScriptLoader(m_Config));
        }
        else if (std::strcmp(key, "Compile") == 0)
        {
            return Core::Get().LoadScript(val, true);
        }
        else if (std::strcmp(key, "Execute") == 0)
        {
            return Core::Get().LoadScript(val, false);
        }
        // Move to the next element!
        return true;
    }
};

/* ------------------------------------------------------------------------------------------------
 * Implements RAII to make sure that entity containers area cleaned up at all costs.
*/
class ContainerCleaner
{
    // --------------------------------------------------------------------------------------------
    EntityType m_Type; // The type of entity container to clear.

public:

    /* --------------------------------------------------------------------------------------------
     * Default constructor.
    */
    template < typename T > ContainerCleaner(T & container, EntityType type, bool destroy)
        : m_Type(type)
    {
        for (auto & ent : container)
        {
            ent.Destroy(destroy, SQMOD_DESTROY_CLEANUP, NullLightObj());
        }
    }

    /* --------------------------------------------------------------------------------------------
     * Destructor.
    */
    ~ContainerCleaner()
    {
        Core::Get().ClearContainer(m_Type);
    }
};

// ------------------------------------------------------------------------------------------------
Core Core::s_Inst;

// ------------------------------------------------------------------------------------------------
Core::Core() noexcept
    : m_State(0)
    , m_VM(nullptr)
    , m_Scripts()
    , m_PendingScripts()
    , m_Options()
    , m_Blips()
    , m_Checkpoints()
    , m_Keybinds()
    , m_Objects()
    , m_Pickups()
    , m_Players()
    , m_Vehicles()
    , m_Events()
    , m_CircularLocks(0)
    , m_ReloadHeader(0)
    , m_ReloadPayload()
    , m_IncomingNameBuffer(nullptr)
    , m_IncomingNameCapacity(0)
    , m_AreasEnabled(false)
    , m_Debugging(false)
    , m_Executed(false)
    , m_Shutdown(false)
    , m_LockPreLoadSignal(false)
    , m_LockPostLoadSignal(false)
    , m_LockUnloadSignal(false)
    , m_EmptyInit(false)
    , m_Verbosity(1)
    , m_NullBlip()
    , m_NullCheckpoint()
    , m_NullKeybind()
    , m_NullObject()
    , m_NullPickup()
    , m_NullPlayer()
    , m_NullVehicle()
{
    /* ... */
}

// ------------------------------------------------------------------------------------------------
Core::~Core()
{
    if (m_VM)
    {
        Terminate(true);
    }
}

// ------------------------------------------------------------------------------------------------
bool Core::Initialize()
{
    // Make sure the plug-in was not already initialized
    if (m_VM != nullptr)
    {
        OutputError("Plug-in was already initialized");
        return true;
    }

    CSimpleIniA conf(false, true, true);
    // Attempt to load the configurations from disk
    SI_Error ini_ret = conf.LoadFile("sqmod.ini");
    // See if the configurations could be loaded
    if (ini_ret < 0)
    {
        switch (ini_ret)
        {
            case SI_FAIL:
            {
                OutputError("Failed to load the configuration file. Probably invalid");
            } break;
            case SI_NOMEM:
            {
                OutputError("Run out of memory while loading the configuration file");
            } break;
            case SI_FILE:
            {
                OutputError("Failed to load the configuration file. %s", std::strerror(errno));
            } break;
            default: OutputError("Failed to load the configuration file for some unforeseen reason");
        }
        // Failed to load the configuration file
        return false;
    }

    // See if debugging options should be enabled
    m_Debugging = conf.GetBoolValue("Squirrel", "Debugging", m_Debugging);
    // Configure the empty initialization
    m_EmptyInit = conf.GetBoolValue("Squirrel", "EmptyInit", false);
    // Configure the verbosity level
    m_Verbosity = conf.GetLongValue("Log", "VerbosityLevel", 1);
    // Initialize the log filename
    Logger::Get().SetLogFilename(conf.GetValue("Log", "Filename", nullptr));
    // Configure the logging timestamps
    Logger::Get().ToggleConsoleTime(conf.GetBoolValue("Log", "ConsoleTimestamp", false));
    Logger::Get().ToggleLogFileTime(conf.GetBoolValue("Log", "LogFileTimestamp", true));
    // Apply the specified logging filters only after initialization was completed
    Logger::Get().ToggleConsoleLevel(LOGL_DBG, conf.GetBoolValue("Log", "ConsoleDebug", true));
    Logger::Get().ToggleConsoleLevel(LOGL_USR, conf.GetBoolValue("Log", "ConsoleUser", true));
    Logger::Get().ToggleConsoleLevel(LOGL_SCS, conf.GetBoolValue("Log", "ConsoleSuccess", true));
    Logger::Get().ToggleConsoleLevel(LOGL_INF, conf.GetBoolValue("Log", "ConsoleInfo", true));
    Logger::Get().ToggleConsoleLevel(LOGL_WRN, conf.GetBoolValue("Log", "ConsoleWarning", true));
    Logger::Get().ToggleConsoleLevel(LOGL_ERR, conf.GetBoolValue("Log", "ConsoleError", true));
    Logger::Get().ToggleConsoleLevel(LOGL_FTL, conf.GetBoolValue("Log", "ConsoleFatal", true));
    Logger::Get().ToggleLogFileLevel(LOGL_DBG, conf.GetBoolValue("Log", "LogFileDebug", true));
    Logger::Get().ToggleLogFileLevel(LOGL_USR, conf.GetBoolValue("Log", "LogFileUser", true));
    Logger::Get().ToggleLogFileLevel(LOGL_SCS, conf.GetBoolValue("Log", "LogFileSuccess", true));
    Logger::Get().ToggleLogFileLevel(LOGL_INF, conf.GetBoolValue("Log", "LogFileInfo", true));
    Logger::Get().ToggleLogFileLevel(LOGL_WRN, conf.GetBoolValue("Log", "LogFileWarning", true));
    Logger::Get().ToggleLogFileLevel(LOGL_ERR, conf.GetBoolValue("Log", "LogFileError", true));
    Logger::Get().ToggleLogFileLevel(LOGL_FTL, conf.GetBoolValue("Log", "LogFileFatal", true));

    cLogDbg(m_Verbosity >= 1, "Resizing the entity containers");
    // Make sure the entity containers have the proper size
    m_Blips.resize(SQMOD_BLIP_POOL);
    m_Checkpoints.resize(SQMOD_CHECKPOINT_POOL);
    m_Keybinds.resize(SQMOD_KEYBIND_POOL);
    m_Objects.resize(SQMOD_OBJECT_POOL);
    m_Pickups.resize(SQMOD_PICKUP_POOL);
    m_Players.resize(SQMOD_PLAYER_POOL);
    m_Vehicles.resize(SQMOD_VEHICLE_POOL);

    // Attempt to read the virtual machine stack size
    const LongI stack_size = conf.GetLongValue("Squirrel", "StackSize", SQMOD_STACK_SIZE);
    // Make sure that the retrieved number is within range
    if (!stack_size)
    {
        LogWrn("Invalid virtual machine stack size: %lu", stack_size);
        // Stop the initialization process
        return false;
    }

    cLogDbg(m_Verbosity >= 1, "Creating a virtual machine (%ld stack size)", stack_size);
    // Attempt to create the script virtual machine
    m_VM = sq_open(ConvTo< SQInteger >::From(stack_size));
    // See if the virtual machine could be created
    if (cLogFtl(!m_VM, "Unable to create the virtual machine"))
    {
        return false; // Unable to load the plug-in properly!
    }

    // Set this as the default VM
    DefaultVM::Set(m_VM);
    // Configure error handling
    ErrorHandling::Enable(conf.GetBoolValue("Squirrel", "ErrorHandling", true));

    // Prevent common null objects from using dead virtual machines
    NullArray() = Array();
    NullTable() = Table();
    NullObject() = Object();
    NullLightObj() = LightObj();
    NullFunction() = Function();

    cLogDbg(m_Verbosity >= 1, "Registering the standard libraries");
    // Push the root table on the stack
    sq_pushroottable(m_VM);
    // Register the standard library on the pushed table
    sqstd_register_iolib(m_VM);
    sqstd_register_bloblib(m_VM);
    sqstd_register_mathlib(m_VM);
    sqstd_register_systemlib(m_VM);
    sqstd_register_stringlib(m_VM);
    // Pop the root table from the stack
    sq_pop(m_VM, 1);

    cLogDbg(m_Verbosity >= 1, "Setting the script output function");
    // Tell the VM to use these functions to output user on error messages
    sq_setprintfunc(m_VM, PrintFunc, ErrorFunc);

    cLogDbg(m_Verbosity >= 1, "Setting the script error handlers");
    // Tell the VM to trigger this function on compile time errors
    sq_setcompilererrorhandler(m_VM, CompilerErrorHandler);
    // Push the runtime error handler on the stack and create a closure
    sq_newclosure(m_VM, RuntimeErrorHandler, 0);
    // Tell the VM to trigger this function on runtime errors
    sq_seterrorhandler(m_VM);

    cLogDbg(m_Verbosity >= 1, "Registering the plug-in API");
    // Attempt to register the plug-in API
    if (!RegisterAPI(m_VM))
    {
        LogFtl("Unable to register the plug-in API");
        return false; // Can't execute scripts without a valid API!
    }

    // Initialize the module global events
    InitEvents();

    // Initialize load stage signals
    InitSignalPair(mOnPreLoad, NullLightObj(), nullptr);
    InitSignalPair(mOnPostLoad, NullLightObj(), nullptr);
    InitSignalPair(mOnUnload, NullLightObj(), nullptr);

    CSimpleIniA::TNamesDepend scripts;
    // Attempt to retrieve the list of keys to make sure there's actually something to process
    if (conf.GetAllKeys("Scripts", scripts) && !scripts.empty())
    {
        // Attempt to load the specified scripts
        if (!conf.ProcAllValues("Scripts", ScriptLoader(conf)))
        {
            LogErr("Unable to load the specified scripts");
            // Either no script was found or failed to load
            return false;
        }
    }

    // See if any script could be queued for loading
    if (m_PendingScripts.empty() && !m_EmptyInit)
    {
        LogErr("No scripts loaded. No reason to load the plug-in");
        // No point in loading the plug-in
        return false;
    }

    cLogDbg(m_Verbosity >= 1, "Reading the options from the general section");
    // Read options only after loading was successful
    CSimpleIniA::TNamesDepend options;
    // Are there any options to read?
    if (conf.GetAllKeys("Options", options) || !options.empty())
    {
        cLogDbg(m_Verbosity >= 1, "Found (%" PRINT_SZ_FMT ") options in the configuration file",
                    static_cast< SQUnsignedInteger >(options.size()));
        // Process all the specified keys under the [Options] section
        for (const auto & option : options)
        {
            CSimpleIniA::TNamesDepend values;
            // Get the values of all keys with the same name
            if (!conf.GetAllValues("Options", option.pItem, values))
            {
                continue;
            }
            // Sort the keys in their original order
            values.sort(CSimpleIniA::Entry::LoadOrder());
            // Save each option option and overwrite existing value
            for (const auto & value : values)
            {
                m_Options[option.pItem] = value.pItem;
            }
        }
    }

    // Initialize routines and tasks
    InitializeRoutines();
    InitializeTasks();
    // Initialize third-party

    // Initialization successful
    return true;
}

// ------------------------------------------------------------------------------------------------
bool Core::Execute()
{
    // Are there any scripts to execute?
    if (m_PendingScripts.empty())
    {
        // Are we allowed to continue without any scripts?
        if (m_EmptyInit)
        {
            LogWrn("No scripts to execute. Empty initialization was forced");
            // Allow empty initialization since it was requested
            return true;
        }
        LogWrn("No scripts to execute. Plug-in has no purpose");
        // No reason to execute the plug-in
        return false;
    }

    // Unlock signal containers
    m_LockPreLoadSignal = false;
    m_LockPostLoadSignal = false;
    m_LockUnloadSignal = false;

    cLogDbg(m_Verbosity >= 1, "Signaling outside plug-ins to register their API");
    // Tell modules to do their monkey business
    _Func->SendPluginCommand(SQMOD_LOAD_CMD, "");

    // Load pending scripts while we're in the bounds of the allowed recursiveness
    for (unsigned levels = 0; !m_PendingScripts.empty() && (levels < 8); ++levels)
    {
        // Remember the last script from the pool
        const Scripts::size_type last = m_Scripts.size();
        // Push pending scripts to the back of the list
        std::move(m_PendingScripts.begin(), m_PendingScripts.end(), std::back_inserter(m_Scripts));
        // Clear all pending scripts, if any
        m_PendingScripts.clear();
        // Process all pending scripts
        if (!DoScripts(m_Scripts.begin() + last, m_Scripts.end()))
        {
            return false; // One of the scripts failed to execute
        }

        cLogDbg(m_Verbosity >= 2, "Completed execution of stage (%u) scripts. Pending scripts %" PRINT_SZ_FMT,
                    levels, static_cast< SQUnsignedInteger >(m_PendingScripts.size()));
    }
    // Force enable null entities if not already enabled by script
    EnableNullEntities();

    m_LockPreLoadSignal = true;
    // Trigger callbacks that must initialize stuff before the loaded event is triggered
    (*mOnPreLoad.first)();
    // Clear the callbacks
    ResetSignalPair(mOnPreLoad);

    // Notify the script callback that the scripts were loaded
    EmitScriptLoaded();

    m_LockPostLoadSignal = true;
    // Trigger callbacks that must initialize stuff after the loaded event is triggered
    (*mOnPostLoad.first)();
    // Clear the callbacks
    ResetSignalPair(mOnPostLoad);

    // Import already existing entities
    ImportPlayers();
    ImportBlips();
    ImportCheckpoints();
    ImportKeybinds();
    ImportObjects();
    ImportPickups();
    ImportVehicles();
    // Successfully executed
    return (m_Executed = true);
}

// ------------------------------------------------------------------------------------------------
void Core::Terminate(bool shutdown)
{
    m_Shutdown = shutdown;
    // Is there a virtual machine present?
    if (m_VM)
    {
        m_LockUnloadSignal = true;
        // Trigger callbacks that must de-initialize stuff before the scripts are unloaded
        (*mOnUnload.first)();
        // Clear the callbacks
        ResetSignalPair(mOnUnload);

        cLogDbg(m_Verbosity >= 1, "Signaling outside plug-ins to release their resources");
        // Tell modules to do their monkey business
        _Func->SendPluginCommand(SQMOD_TERMINATE_CMD, "");
    }
    cLogDbg(m_Verbosity >= 1, "Clearing the entity containers");
    // Release all entity resources by clearing the containers
    const ContainerCleaner cc_players(m_Players, ENT_PLAYER, !shutdown);
    const ContainerCleaner cc_vehicles(m_Vehicles, ENT_VEHICLE, !shutdown);
    const ContainerCleaner cc_objects(m_Objects, ENT_OBJECT, !shutdown);
    const ContainerCleaner cc_pickups(m_Pickups, ENT_PICKUP, !shutdown);
    const ContainerCleaner cc_checkpoints(m_Checkpoints, ENT_CHECKPOINT, !shutdown);
    const ContainerCleaner cc_blips(m_Blips, ENT_BLIP, !shutdown);
    const ContainerCleaner cc_keybinds(m_Keybinds, ENT_KEYBIND, !shutdown);
    cLogDbg(m_Verbosity >= 1, "Terminating routines an commands");
    // Release third-party

    // Release all resources from routines and tasks
    TerminateRoutines();
    TerminateTasks();
    // Release all resources from command managers
    TerminateCommands();
    // Release all resources from signals
    TerminateSignals();
    // Release all managed areas
    TerminateAreas();
    // Release privilege managers
    TerminatePrivileges();
    // In case there's a payload for reload
    m_ReloadPayload.Release();
    // Release null objects in case any reference to valid objects is stored in them
    NullArray().Release();
    NullTable().Release();
    NullObject().Release();
    NullLightObj().Release();
    NullFunction().Release();
    // Release null entity instances
    m_NullBlip.Release();
    m_NullCheckpoint.Release();
    m_NullKeybind.Release();
    m_NullObject.Release();
    m_NullPickup.Release();
    m_NullPlayer.Release();
    m_NullVehicle.Release();
    // Is there a VM to close?
    if (m_VM)
    {
        cLogDbg(m_Verbosity >= 1, "Releasing any final resources and all loaded scripts");
        // Release all script callbacks
        DropEvents();
        // Release the script instances
        m_Scripts.clear();
        m_PendingScripts.clear(); // Just in case
        // Specify that no scripts are left executed
        m_Executed = false;
        // Assertions during close may cause double delete/close!
        HSQUIRRELVM sq_vm = m_VM;
        m_VM = nullptr;

        cLogDbg(m_Verbosity >= 1, "Signaling outside plug-ins the virtual machine is closing");
        // Tell modules to do their monkey business
        _Func->SendPluginCommand(SQMOD_CLOSING_CMD, "");
        // Release any callbacks from the logger
        Logger::Get().Release();
        // Attempt to close the VM
        sq_close(sq_vm);

        cLogDbg(m_Verbosity >= 1, "Signaling outside plug-ins to release the virtual machine");
        // Tell modules to do their monkey business
        _Func->SendPluginCommand(SQMOD_RELEASED_CMD, "");
    }

    OutputMessage("Squirrel plug-in was successfully terminated");
}

// ------------------------------------------------------------------------------------------------
bool Core::Reload()
{
    // Are we already reloading?
    if (m_CircularLocks & CCL_RELOAD_SCRIPTS)
    {
        return false; // Already reloading!
    }
    // Prevent circular reloads when we send plug-in commands
    const BitGuardU32 bg(m_CircularLocks, static_cast< Uint32 >(CCL_RELOAD_SCRIPTS));
    // Allow reloading by default
    Core::Get().SetState(1);
    // Emit the reload event
    Core::Get().EmitScriptReload(m_ReloadHeader, m_ReloadPayload);
    // Are we allowed to reload?
    if (!Core::Get().GetState())
    {
        return false; // Request denied!
    }
    // Terminate the current VM and release resources
    Terminate(false);
    // Reset the reload header after termination
    m_ReloadHeader = -1;
    // Attempt to initialize the central core and load resources
    return (Initialize() && Execute());
}

// ------------------------------------------------------------------------------------------------
void Core::EnableNullEntities()
{
    // Create the null entity instances
    if (m_NullBlip.IsNull()) m_NullBlip = LightObj(DeleteGuard< CBlip >(new CBlip(-1)));
    if (m_NullCheckpoint.IsNull()) m_NullCheckpoint = LightObj(DeleteGuard< CCheckpoint >(new CCheckpoint(-1)));
    if (m_NullKeybind.IsNull()) m_NullKeybind = LightObj(DeleteGuard< CKeybind >(new CKeybind(-1)));
    if (m_NullObject.IsNull()) m_NullObject = LightObj(DeleteGuard< CObject >(new CObject(-1)));
    if (m_NullPickup.IsNull()) m_NullPickup = LightObj(DeleteGuard< CPickup >(new CPickup(-1)));
    if (m_NullPlayer.IsNull()) m_NullPlayer = LightObj(DeleteGuard< CPlayer >(new CPlayer(-1)));
    if (m_NullVehicle.IsNull()) m_NullVehicle = LightObj(DeleteGuard< CVehicle >(new CVehicle(-1)));
}

// ------------------------------------------------------------------------------------------------
const String & Core::GetOption(const String & name) const
{
    auto elem = m_Options.find(name);
    return (elem == m_Options.end()) ? NullString() : elem->second;
}

// ------------------------------------------------------------------------------------------------
const String & Core::GetOption(const String & name, const String & value) const
{
    auto elem = m_Options.find(name);
    return (elem == m_Options.end()) ? value : elem->second;
}

// ------------------------------------------------------------------------------------------------
void Core::SetOption(const String & name, const String & value)
{
    m_Options[name] = value;
}

// ------------------------------------------------------------------------------------------------
Core::Scripts::iterator Core::FindScript(const CSStr src)
{
    // Iterate over loaded scripts
    for (auto itr = m_Scripts.begin(); itr != m_Scripts.end(); ++itr)
    {
        // Is this script the source we're looking for?
        if (itr->mPath.compare(0, String::npos, src) == 0)
        {
            return itr;
        }
    }
    // Not found!
    return m_Scripts.end();
}

// ------------------------------------------------------------------------------------------------
Core::Scripts::iterator Core::FindPendingScript(const CSStr src)
{
    // Iterate over loaded scripts
    for (auto itr = m_PendingScripts.begin(); itr != m_PendingScripts.end(); ++itr)
    {
        // Is this script the source we're looking for?
        if (itr->mPath.compare(0, String::npos, src) == 0)
        {
            return itr;
        }
    }
    // Not found!
    return m_PendingScripts.end();
}

// ------------------------------------------------------------------------------------------------
bool Core::LoadScript(CSStr filepath, bool delay)
{
    // Is the specified path empty?
    if (!filepath || *filepath == '\0')
    {
        LogErr("Cannot load script with empty or invalid path");
        // Failed to load
        return false;
    }

    Buffer bpath;
    // Attempt to get the real file path
    try
    {
        bpath = GetRealFilePath(filepath);
    }
    catch (const Sqrat::Exception & e)
    {
        LogErr("Unable to load script: %s", e.what());
        // Failed to load
        return false;
    }
    catch (const std::exception & e)
    {
        LogErr("Unable to load script: %s", e.what());
        // Failed to load
        return false;
    }

    // Make the path into a string
    String path(bpath.Data(), bpath.Position());

    // See if it wasn't already loaded
    if (std::find_if(m_Scripts.cbegin(), m_Scripts.cend(), [&path](Scripts::const_reference s) {
        return (s.mPath == path);
    }) != m_Scripts.end())
    {
        LogWrn("Script was specified before: %s", path.c_str());
    }
    // Also check the pending scripts container
    else if (std::find_if(m_PendingScripts.cbegin(), m_PendingScripts.cend(), [&path](Scripts::const_reference s) {
        return (s.mPath == path);
    }) != m_PendingScripts.end())
    {
        LogWrn("Script was specified before: %s", path.c_str());
    }
    // Were the scripts already executed? Then there's no need to queue them
    else if (m_Executed)
    {
        // Create a new script container and insert it into the script pool
        m_Scripts.emplace_back(m_VM, path, delay, m_Debugging);

        // Attempt to load and compile the script file
        try
        {
            m_Scripts.back().mExec.CompileFile(path);
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to compile: %s", path.c_str());
            // Remove the script container since it's invalid
            m_Scripts.pop_back();
            // Failed to compile properly
            return false;
        }
        // At this point the script should be completely loaded
        cLogDbg(m_Verbosity >= 3, "Compiled script: %s", path.c_str());

        // Attempt to execute the compiled script code
        try
        {
            m_Scripts.back().mExec.Run();
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to execute: %s", path.c_str());
            // Remove the script container since it's invalid
            m_Scripts.pop_back();
            // Failed to execute properly
            return false;
        }
        // At this point the script should be completely loaded
        cLogScs(m_Verbosity >= 2, "Executed script: %s", path.c_str());
    }
    // We don't compile the scripts yet. We just store their path and prepare the objects
    else
    {
        cLogDbg(m_Verbosity >= 2, "Pending %s script: %s", (delay ? "deferred" : "immediate"), path.c_str());
        // Attempt to queue the script
        try
        {
            // Create a new script container and insert it into the pending script pool
            m_PendingScripts.emplace_back(m_VM, path, delay, m_Debugging);
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to queue: %s", e.what());
            // Failed to queue script
            return false;
        }
    }

    // At this point the script exists in one of the pools
    return true;
}

// ------------------------------------------------------------------------------------------------
void Core::SetIncomingName(CSStr name)
{
    // Is there an incoming connection buffer that we can write to?
    if (!m_IncomingNameBuffer)
    {
        STHROWF("No incoming player name buffer available");
    }
    // Is the specified name valid?
    else if (!name || *name == '\0')
    {
        STHROWF("Invalid player name for incoming connection");
    }
    // Calculate the length of the specified name
    const size_t len = std::strlen(name);
    // Is the length of the name out of bounds?
    if (len > m_IncomingNameCapacity)
    {
        STHROWF("The specified name exceeds the designated buffer");
    }
    // Does the name satisfy the minimum length required?
    else if (len < 2)
    {
        STHROWF("The specified name needs to be at least 2 characters: %zu", len);
    }
    // Copy the specified name to the assigned buffer
    std::strncpy(m_IncomingNameBuffer, name, m_IncomingNameCapacity);
    // Make sure that the name inside the buffer is null terminated
    m_IncomingNameBuffer[len] = '\0';
}

// ------------------------------------------------------------------------------------------------
String Core::FetchCodeLine(CSStr src, SQInteger line, bool trim)
{
    // Find the script we're looking for
    auto script = FindScript(src);
    // Do we have a valid script and line?
    if ((script == m_Scripts.end()) || !(script->mInfo) || (static_cast< SQInteger >(script->mLine.size()) < line))
    {
        return String{}; // No such script!
    }
    // Fetch the line of code
    return script->FetchLine(line, trim);
}

// ------------------------------------------------------------------------------------------------
bool Core::DoScripts(Scripts::iterator itr, Scripts::iterator end)
{
    auto itr_state = itr;

    cLogDbg(Get().m_Verbosity >= 1, "Attempting to compile the specified scripts");
    // Compile scripts first so that the constants can take effect
    for (; itr != end; ++itr)
    {
        // Is this script already compiled?
        if (!(*itr).mExec.IsNull())
        {
            continue; // Already compiled!
        }

        // Attempt to load and compile the script file
        try
        {
            (*itr).mExec.CompileFile((*itr).mPath);
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to compile: %s", (*itr).mPath.c_str());
            // Failed to execute properly
            return false;
        }

        cLogDbg(Get().m_Verbosity >= 3, "Compiled script: %s", (*itr).mPath.c_str());

        // Should we delay the execution of this script?
        if ((*itr).mDelay)
        {
            continue; // Execute later!
        }

        // Attempt to execute the compiled script code
        try
        {
            (*itr).mExec.Run();
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to execute: %s", (*itr).mPath.c_str());
            // Failed to execute properly
            return false;
        }

        cLogScs(Get().m_Verbosity >= 2, "Executed script: %s", (*itr).mPath.c_str());
    }

    cLogDbg(Get().m_Verbosity >= 1, "Attempting to execute the delayed scripts");
    // Execute scripts only after compilation successful
    for (itr = itr_state; itr != end; ++itr)
    {
        // Was this script delayed from execution?
        if (!(*itr).mDelay)
        {
            continue; // Already executed!
        }

        // Attempt to execute the compiled script code
        try
        {
            (*itr).mExec.Run();
        }
        catch (const Sqrat::Exception & e)
        {
            LogFtl("Unable to execute: %s", (*itr).mPath.c_str());
            // Failed to execute properly
            return false;
        }

        cLogScs(Get().m_Verbosity >= 2, "Executed script: %s", (*itr).mPath.c_str());
    }

    // At this point the scripts were loaded and executed successfully
    return true;
}

// ------------------------------------------------------------------------------------------------
void Core::PrintFunc(HSQUIRRELVM /*vm*/, CSStr msg, ...)
{
    // Initialize the variable argument list
    va_list args;
    va_start(args, msg);
    // Forward the message to the logger
    Logger::Get().Send(LOGL_USR, false, msg, args);
    // Finalize the variable argument list
    va_end(args);
}

// ------------------------------------------------------------------------------------------------
void Core::ErrorFunc(HSQUIRRELVM /*vm*/, CSStr msg, ...)
{
    // Initialize the variable argument list
    va_list args;
    va_start(args, msg);
    // Tell the logger to display debugging information
    Logger::Get().Debug(msg, args);
    // Finalize the variable argument list
    va_end(args);
}

// ------------------------------------------------------------------------------------------------
SQInteger Core::RuntimeErrorHandler(HSQUIRRELVM vm)
{
    // Was there a value thrown?
    if (sq_gettop(vm) < 1)
    {
        return SQ_OK; // No error to display!
    }
    // Attempt to generate the string value
    StackStrF val(vm, 2);
    // Have we failed to retrieve the string?
    if (SQ_FAILED(val.Proc(false)))
    {
        Logger::Get().Debug(_SC("Unknown runtime error has occurred"));
    }
    else
    {
        Logger::Get().Debug(_SC("%s"), val.mPtr);
    }
    // We handled the error
    return SQ_OK;
}

// ------------------------------------------------------------------------------------------------
void Core::CompilerErrorHandler(HSQUIRRELVM /*vm*/, CSStr desc, CSStr src, SQInteger line, SQInteger column)
{
    // Should we include code in output? (we count lines from 0, squirrel counts from 1)
    if ((line <= 0) || !Core::Get().IsDebugging() || !Core::Get().CompilerErrorHandlerEx(desc, src, --line, column)) {
        LogFtl("Message: %s\n[\n=>Location: %s\n=>Line: %" PRINT_INT_FMT "\n=>Column: %" PRINT_INT_FMT "\n]", desc, src, line, column);
    }
}

// ------------------------------------------------------------------------------------------------
bool Core::CompilerErrorHandlerEx(CSStr desc, CSStr src, SQInteger line, SQInteger column)
{
    // Grab the associated line of code
    String code = FetchCodeLine(src, line, true);
    // Contains an arrow pointing at the exact column
    String point;
    // Do we have a valid column?
    if (column >= 0)
    {
        // The `=>Code: ` is included as white space
        point.resize(8, ' ');
        // The line towards the arrow
        point.resize(column+7, '-');
        // Append the actual arrow
        point.push_back('^');
        // Include the new line here
        point.push_back('\n');
    }
    // Valid line of code?
    if (!code.empty())
    {
        // Display the error message with the code included
        LogFtl("Message: %s\n[\n=>Location: %s\n=>Line: %" PRINT_SZ_FMT "\n=>Column: %" PRINT_INT_FMT "\n=>Code: %s\n%s]",
            desc, src, ++line, column, code.c_str(), point.c_str());
        // We displayed the information
        return true;
    }
    // No code to show. Fall back to normal message
    return true;
}

} // Namespace:: SqMod

/* ------------------------------------------------------------------------------------------------
 * Include remaining functionality.
*/
#include "Core/Inst.inc"
#include "Core/Entity.inc"
#include "Core/Events.inc"
#include "Core/Utils.inc"
#include "Core/Funcs.inc"