//===-- MICmdMgr.cpp --------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// In-house headers:
#include "MICmdMgr.h"
#include "MICmnResources.h"
#include "MICmnLog.h"
#include "MICmdInterpreter.h"
#include "MICmdFactory.h"
#include "MICmdInvoker.h"
#include "MICmdBase.h"
#include "MIUtilSingletonBase.h"
#include "MIUtilSingletonHelper.h"

//++ ------------------------------------------------------------------------------------
// Details: CMICmdMgr constructor.
// Type:    Method.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMICmdMgr::CMICmdMgr(void)
    : m_interpretor(CMICmdInterpreter::Instance())
    , m_factory(CMICmdFactory::Instance())
    , m_invoker(CMICmdInvoker::Instance())
{
}

//++ ------------------------------------------------------------------------------------
// Details: CMICmdMgr destructor.
// Type:    Overridable.
// Args:    None.
// Return:  None.
// Throws:  None.
//--
CMICmdMgr::~CMICmdMgr(void)
{
    Shutdown();
}

//++ ------------------------------------------------------------------------------------
// Details: Initialize resources for *this Command Manager.
// Type:    Method.
// Args:    None.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdMgr::Initialize(void)
{
    m_clientUsageRefCnt++;

    if (m_bInitialized)
        return MIstatus::success;

    bool bOk = MIstatus::success;
    CMIUtilString errMsg;

    // Note initialization order is important here as some resources depend on previous
    MI::ModuleInit<CMICmnLog>(IDS_MI_INIT_ERR_LOG, bOk, errMsg);
    MI::ModuleInit<CMICmnResources>(IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg);
    if (bOk && !m_interpretor.Initialize())
    {
        bOk = false;
        errMsg = CMIUtilString::Format(MIRSRC(IDS_MI_INIT_ERR_CMDINTERPRETER), m_interpretor.GetErrorDescription().c_str());
    }
    if (bOk && !m_factory.Initialize())
    {
        bOk = false;
        errMsg = CMIUtilString::Format(MIRSRC(IDS_MI_INIT_ERR_CMDFACTORY), m_factory.GetErrorDescription().c_str());
    }
    if (bOk && !m_invoker.Initialize())
    {
        bOk = false;
        errMsg = CMIUtilString::Format(MIRSRC(IDS_MI_INIT_ERR_CMDINVOKER), m_invoker.GetErrorDescription().c_str());
    }
    m_bInitialized = bOk;

    if (!bOk)
    {
        CMIUtilString strInitError(CMIUtilString::Format(MIRSRC(IDS_MI_INIT_ERR_CMDMGR), errMsg.c_str()));
        SetErrorDescription(strInitError);
        return MIstatus::failure;
    }

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Release resources for *this Command Manager.
// Type:    Method.
// Args:    None.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdMgr::Shutdown(void)
{
    if (--m_clientUsageRefCnt > 0)
        return MIstatus::success;

    if (!m_bInitialized)
        return MIstatus::success;

    m_bInitialized = false;

    ClrErrorDescription();

    bool bOk = MIstatus::success;
    CMIUtilString errMsg;

    // Tidy up
    m_setCmdDeleteCallback.clear();

    // Note shutdown order is important here
    if (!m_invoker.Shutdown())
    {
        bOk = false;
        errMsg += CMIUtilString::Format(MIRSRC(IDS_MI_SHTDWN_ERR_CMDINVOKER), m_invoker.GetErrorDescription().c_str());
    }
    if (!m_factory.Shutdown())
    {
        bOk = false;
        if (!errMsg.empty())
            errMsg += ", ";
        errMsg += CMIUtilString::Format(MIRSRC(IDS_MI_SHTDWN_ERR_CMDFACTORY), m_factory.GetErrorDescription().c_str());
    }
    if (!m_interpretor.Shutdown())
    {
        bOk = false;
        if (!errMsg.empty())
            errMsg += ", ";
        errMsg += CMIUtilString::Format(MIRSRC(IDS_MI_SHTDWN_ERR_CMDINTERPRETER), m_interpretor.GetErrorDescription().c_str());
    }
    MI::ModuleShutdown<CMICmnResources>(IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg);
    MI::ModuleShutdown<CMICmnLog>(IDS_MI_INIT_ERR_LOG, bOk, errMsg);

    if (!bOk)
    {
        SetErrorDescriptionn(MIRSRC(IDS_MI_SHUTDOWN_ERR), errMsg.c_str());
    }

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Establish whether the text data is an MI format type command.
// Type:    Method.
// Args:    vTextLine               - (R) Text data to interpret.
//          vwbYesValid             - (W) True = MI type command, false = not recognised.
//          vwbCmdNotInCmdFactor    - (W) True = MI command not found in the command factor, false = recognised.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdMgr::CmdInterpret(const CMIUtilString &vTextLine, bool &vwbYesValid, bool &vwbCmdNotInCmdFactor, SMICmdData &rwCmdData)
{
    return m_interpretor.ValidateIsMi(vTextLine, vwbYesValid, vwbCmdNotInCmdFactor, rwCmdData);
}

//++ ------------------------------------------------------------------------------------
// Details: Having previously had the potential command validated and found valid now
//          get the command executed.
//          If the Functionalityity returns MIstatus::failure call GetErrorDescription().
//          This function is used by the application's main thread.
// Type:    Method.
// Args:    vCmdData    - (RW) Command meta data.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool
CMICmdMgr::CmdExecute(const SMICmdData &vCmdData)
{
    bool bOk = MIstatus::success;

    // Pass the command's meta data structure to the command
    // so it can update it if required. (Need to copy it out of the
    // command before the command is deleted)
    CMICmdBase *pCmd = nullptr;
    bOk = m_factory.CmdCreate(vCmdData.strMiCmd, vCmdData, pCmd);
    if (!bOk)
    {
        const CMIUtilString errMsg(
            CMIUtilString::Format(MIRSRC(IDS_CMDMGR_ERR_CMD_FAILED_CREATE), m_factory.GetErrorDescription().c_str()));
        SetErrorDescription(errMsg);
        return MIstatus::failure;
    }

    bOk = m_invoker.CmdExecute(*pCmd);
    if (!bOk)
    {
        const CMIUtilString errMsg(CMIUtilString::Format(MIRSRC(IDS_CMDMGR_ERR_CMD_INVOKER), m_invoker.GetErrorDescription().c_str()));
        SetErrorDescription(errMsg);
        return MIstatus::failure;
    }

    return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details: Iterate all interested clients and tell them a command is being deleted.
// Type:    Method.
// Args:    vCmdData    - (RW) The command to be deleted.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
// Throws:  None.
//--
bool
CMICmdMgr::CmdDelete(SMICmdData vCmdData)
{
    // Note vCmdData is a copy! The command holding its copy will be deleted soon
    // we still need to iterate callback clients after a command object is deleted

    m_setCmdDeleteCallback.Delete(vCmdData);

    return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details: Register an object to be called when a command object is deleted.
// Type:    Method.
// Args:    vObject - (R) A new interested client.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
// Throws:  None.
//--
bool
CMICmdMgr::CmdRegisterForDeleteNotification(CMICmdMgrSetCmdDeleteCallback::ICallback &vObject)
{
    return m_setCmdDeleteCallback.Register(vObject);
}

//++ ------------------------------------------------------------------------------------
// Details: Unregister an object from being called when a command object is deleted.
// Type:    Method.
// Args:    vObject - (R) The was interested client.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
// Throws:  None.
//--
bool
CMICmdMgr::CmdUnregisterForDeleteNotification(CMICmdMgrSetCmdDeleteCallback::ICallback &vObject)
{
    return m_setCmdDeleteCallback.Unregister(vObject);
}