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

//++
// File:		MICmdMgr.cpp
//
// Overview:	CMICmdMgr implementation.
//
// Environment:	Compilers:	Visual C++ 12.
//							gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//				Libraries:	See MIReadmetxt. 
//
// Copyright:	None.
//--

// 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 );
}