//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Handles parsing and routing of shell commands to their handlers.
//
// $NoKeywords: $
//=============================================================================//

#include "stdafx.h"
#include "MainFrm.h"
#include "MapDoc.h"
#include "MapEntity.h"
#include "Shell.h"
#include "hammer.h"
#include "filesystem_helpers.h"

// memdbgon must be the last include file in a .cpp file!!!
#include <tier0/memdbgon.h>

//-----------------------------------------------------------------------------
// Shell command handler function pointer.
//-----------------------------------------------------------------------------
typedef bool (CShell::*ShellHandlerFunc_t)(const char *pszCommand, const char *pszArguments);


//-----------------------------------------------------------------------------
// Dispatch table entry.
//-----------------------------------------------------------------------------
struct ShellDispatchTable_t
{
	const char *pszCommand;			// Name of command associated with this entry.
	ShellHandlerFunc_t pfnHandler;	// Function handler for the command.
};


//-----------------------------------------------------------------------------
// Dispatch table for shell commands.
//-----------------------------------------------------------------------------
ShellDispatchTable_t CShell::m_DispatchTable[] =
{
	{ "session_begin", &CShell::BeginSession },
	{ "session_end", &CShell::EndSession },
	{ "entity_create", &CShell::EntityCreate },
	{ "entity_delete", &CShell::EntityDelete },
	{ "entity_set_keyvalue", &CShell::EntitySetKeyValue },
	{ "entity_rotate_incremental", &CShell::EntityRotateIncremental },

	{ "map_check_version", &CShell::CheckMapVersion },
	{ "node_create", &CShell::NodeCreate },
	{ "node_delete", &CShell::NodeDelete },
	{ "nodelink_create", &CShell::NodeLinkCreate },
	{ "nodelink_delete", &CShell::NodeLinkDelete },
	{ "release_video_memory", &CShell::ReleaseVideoMemory },
	{ "grab_video_memory", &CShell::GrabVideoMemory },
};


//-----------------------------------------------------------------------------
// Purpose: Constructor.
//-----------------------------------------------------------------------------
CShell::CShell(void)
{
	m_pDoc = NULL;
}


//-----------------------------------------------------------------------------
// Purpose: Destructor.
//-----------------------------------------------------------------------------
CShell::~CShell(void)
{
}


//-----------------------------------------------------------------------------
// Purpose: Initiates a shell editing session.
// Input  : pszCommand - Should be "session_begin".
//			pszArguments - Filename and file version in the engine.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::BeginSession(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && !m_pDoc->IsShellSessionActive())
	{
		if (DoVersionCheck(pszArguments))
		{
			m_pDoc->BeginShellSession();
			return(true);
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Verifies that the map begine edited in the engine is the same name
//			and version as the active document. This prevents problems with
//			editing out of sync versions of the map via the engine.
// Input  : pszCommand - Should be "map_check_version".
//			pszArguments - Filename and file version in the engine.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::CheckMapVersion(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		return(DoVersionCheck(pszArguments));
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Verifies that the map being edited in the engine is the same name
//			and version as the active document. This prevents problems with
//			editing out of sync versions of the map via the engine.
// Input  : pszCommand - 
//			pszArguments - 
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::DoVersionCheck(const char *pszArguments)
{
	if (m_pDoc != NULL)
	{
		char szEngineMapPath[MAX_PATH];
		int nEngineMapVersion;

		if (sscanf(pszArguments, "%s %d", szEngineMapPath, &nEngineMapVersion) == 2)
		{
			char szEngineMapName[MAX_PATH];
			_splitpath(szEngineMapPath, NULL, NULL, szEngineMapName, NULL);

			char szDocName[MAX_PATH];
			_splitpath(m_pDoc->GetPathName(), NULL, NULL, szDocName, NULL);

			int nDocVersion = m_pDoc->GetDocVersion();

			if (!stricmp(szDocName, szEngineMapName) && (nDocVersion == nEngineMapVersion))
			{
				return(true);
			}
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Verifies that the map begine edited in the engine is the same name
//			and version as the active document. This prevents problems with
//			editing out of sync versions of the map via the engine.
// Input  : pszCommand - Should be "session_end".
//			pszArguments - Filename and file version in the engine.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::EndSession(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		m_pDoc->EndShellSession();
		return(true);
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Creates an entity of a given class at a specified location.
// Input  : pszCommand - Should be "entity_create".
//			pszArguments - Class name of entity and x, y, z coordinate at which
//				to create it.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::EntityCreate(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		float x;
		float y;
		float z;
		char szClassName[MAX_PATH];

		if (sscanf(pszArguments, "%s %f %f %f", szClassName, &x, &y, &z) == 4)
		{
			bool bCreated = (m_pDoc->CreateEntity(szClassName, x, y, z) != NULL);
			return(bCreated);
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Deletes an entity by class name and origin.
// Input  : pszCommand - Should be "entity_delete".
//			pszArguments - Class name of entity and x, y, z coordinates.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::EntityDelete(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		float x;
		float y;
		float z;
		char szClassName[MAX_PATH];

		if (sscanf(pszArguments, "%s %f %f %f", szClassName, &x, &y, &z) == 4)
		{
			bool bDeleted = m_pDoc->DeleteEntity(szClassName, x, y, z);
			return(bDeleted);
		}
	}

	return(false);
}

static void RotateMapEntity( CMapEntity *pEntity, const QAngle &rotation )
{
	Vector origin;
	pEntity->GetOrigin( origin );
	QAngle hammerRotate;
	hammerRotate.Init( rotation.z, -rotation.x, rotation.y );
	pEntity->TransRotate( origin, hammerRotate );
}

bool CShell::EntityRotateIncremental(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		const int NUM_ROTATE_INCREMENTAL_ARGS = 7;
		float x;
		float y;
		float z;
		QAngle rotation;
		char szArgs[NUM_ROTATE_INCREMENTAL_ARGS][512]; // classname, x, y, z, ax, ay, az
		char token[1024];
		const char *pBuffer = pszArguments;

		int arg = 0;
		while ( pBuffer && arg < NUM_ROTATE_INCREMENTAL_ARGS )
		{
			pBuffer = ParseFile( pBuffer, token, NULL );
			if ( pBuffer )
			{
				Q_strncpy( szArgs[arg], token, ARRAYSIZE(szArgs[arg]) );
				arg++;
			}
		}
		if ( arg == NUM_ROTATE_INCREMENTAL_ARGS )
		{
			x = atof(szArgs[1]);
			y = atof(szArgs[2]);
			z = atof(szArgs[3]);
			CMapEntity *pEntity = m_pDoc->FindEntity(szArgs[0], x, y, z);
			if (pEntity != NULL)
			{
				rotation.x = atof(szArgs[4]);
				rotation.y = atof(szArgs[5]);
				rotation.z = atof(szArgs[6]);
				RotateMapEntity( pEntity, rotation );
				return true;
			}
		}
	}
	return false;
}

//-----------------------------------------------------------------------------
// Purpose: Sets a keyvalue on an entity, searching by classname & origin
// Input  : pszCommand - Should be "entity_delete".
//			pszArguments - Class name of entity and x, y, z coordinates.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::EntitySetKeyValue(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		const int NUM_KEY_VALUE_ARGS = 6;
		float x;
		float y;
		float z;
		char szArgs[NUM_KEY_VALUE_ARGS][512]; // classname, x, y, z, key, value
		char token[1024];
		const char *pBuffer = pszArguments;

		int arg = 0;
		while ( pBuffer && arg < NUM_KEY_VALUE_ARGS )
		{
			pBuffer = ParseFile( pBuffer, token, NULL );
			if ( pBuffer )
			{
				Q_strncpy( szArgs[arg], token, ARRAYSIZE(szArgs[arg]) );
				arg++;
			}
		}
		if ( arg == NUM_KEY_VALUE_ARGS )
		{
			x = atof(szArgs[1]);
			y = atof(szArgs[2]);
			z = atof(szArgs[3]);
			CMapEntity *pEntity = m_pDoc->FindEntity(szArgs[0], x, y, z);
			if (pEntity != NULL)
			{
				if ( !Q_stricmp( szArgs[4], "origin" ) )
				{
					Vector origin;
					sscanf(szArgs[5], "%f %f %f", &origin[0], &origin[1], &origin[2]);
					Vector oldOrigin;
					pEntity->GetOrigin( oldOrigin );
					pEntity->TransMove(origin - oldOrigin);
				}
				else if ( pEntity->IsSolidClass() && !Q_stricmp( szArgs[4], "angles" ) )
				{
					QAngle angles;
					sscanf(szArgs[5], "%f %f %f", &angles[0], &angles[1], &angles[2]);
					
					// build a relative transform from the previous state to the current state
					// NOTE: This only works once since solid classes destructively modify transform info (GetAngles always returns identity)
					// NOTE: Use rotateIncremental instead!
					QAngle oldAngles;
					pEntity->GetAngles( oldAngles );
					if ( oldAngles != angles )
					{
						QAngle xformAngles;
						RotationDelta( oldAngles, angles, &xformAngles );
						RotateMapEntity( pEntity, xformAngles );
					}
				}
				else
				{
					pEntity->SetKeyValue( szArgs[4], szArgs[5] );
				}
				return true;
			}
		}
	}

	return false;
}


//-----------------------------------------------------------------------------
// Purpose: Creates a navigation node of a given class at a specified location.
// Input  : pszCommand - Should be "node_create".
//			pszArguments - Class name of node to create, ID to assign it, and
//			x, y, z coordinate at which to create the node.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::NodeCreate(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		float x;
		float y;
		float z;
		int nID;
		char szClassName[MAX_PATH];

		if (sscanf(pszArguments, "%s %d %f %f %f", szClassName, &nID, &x, &y, &z) == 5)
		{
			m_pDoc->SetNextNodeID(nID);
			m_pDoc->CreateEntity(szClassName, x, y, z);

			return(true);
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Deletes a navigation node by ID.
// Input  : pszCommand - Should be "node_delete".
//			pszArguments - Unique node ID of node to delete.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::NodeDelete(const char *pszCommand, const char *pszArguments)
{
	bool bFound = false;

	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		char szID[80];
		if (sscanf(pszArguments, "%s", szID) == 1)
		{
			CMapEntityList Found;
			if (m_pDoc->FindEntitiesByKeyValue(Found, "nodeid", szID, false))
			{
                FOR_EACH_OBJ( Found, pos )
				{
					CMapEntity *pEntity = Found.Element(pos);
					m_pDoc->DeleteObject(pEntity);
					bFound = true;
				}
			}
		}
	}

	return(bFound);
}


//-----------------------------------------------------------------------------
// Purpose: Creates a navigation node of a given class at a specified location.
// Input  : pszCommand - Should be "nodelink_create".
//			pszArguments - Node ids of start and end nodes, space delimited.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::NodeLinkCreate(const char *pszCommand, const char *pszArguments)
{
	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		char szIDStart[80];
		char szIDEnd[80];

		if (sscanf(pszArguments, "%s %s", szIDStart, szIDEnd) == 2)
		{
			//
			// It doesn't matter where we place it because it will move to the midpoint of the
			// start and end entities.
			//
			CMapEntity *pEntity = m_pDoc->CreateEntity("info_node_link", 0, 0, 0);
			if (pEntity != NULL)
			{
				pEntity->SetKeyValue("startnode", szIDStart);
				pEntity->SetKeyValue("endnode", szIDEnd);

				return(true);
			}
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Deletes a navigation node by class name and ID.
// Input  : pszCommand - Should be "node_delete".
//			pszArguments - Class name of node and unique node ID.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::NodeLinkDelete(const char *pszCommand, const char *pszArguments)
{
	bool bFound = false;

	if ((m_pDoc != NULL) && m_pDoc->IsShellSessionActive())
	{
		char szIDStart[80];
		char szIDEnd[80];

		if (sscanf(pszArguments, "%s %s", szIDStart, szIDEnd) == 2)
		{
			//
			// Look for info_node_link entities with the appropriate start/end keys.
			//
			CMapEntityList Found;
			if (m_pDoc->FindEntitiesByClassName(Found, "info_node_link", false))
			{
				FOR_EACH_OBJ( Found, pos )
				{
					CMapEntity *pEntity = Found.Element(pos);

					const char *pszNode1 = pEntity->GetKeyValue("startnode");
					const char *pszNode2 = pEntity->GetKeyValue("endnode");
					if ((pszNode1 != NULL) && (pszNode2 != NULL))
					{
						if (((!stricmp(pszNode1, szIDStart)) && (!stricmp(pszNode2, szIDEnd))) ||
							((!stricmp(pszNode1, szIDEnd)) && (!stricmp(pszNode2, szIDStart))))
						{
							m_pDoc->DeleteObject(pEntity);
							bFound = true;
						}
					}
				}
			}
		}
	}

	return(bFound);
}


//-----------------------------------------------------------------------------
// Purpose: Releases all video memory 
// Input  : pszCommand - Should be "release_video_memory".
//			pszArguments - None.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::ReleaseVideoMemory(const char *pszCommand, const char *pszArguments)
{
	APP()->ReleaseVideoMemory();
	APP()->SuppressVideoAllocation(true);
	return(true);
}


//-----------------------------------------------------------------------------
// Purpose: Indicates it's safe to grab video memory
// Input  : pszCommand - Should be "grab_video_memory".
//			pszArguments - None.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::GrabVideoMemory(const char *pszCommand, const char *pszArguments)
{
	APP()->SuppressVideoAllocation(false);
	return(true);
}


//-----------------------------------------------------------------------------
// Purpose: Attempts to fund a command in the dispatch table, then routes the
//			command and its arguments to the handler, if found.
// Input  : pszCommand - Command and arguments.
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CShell::RunCommand(const char *pszCommand)
{
	for (int nCommand = 0; nCommand < sizeof(m_DispatchTable) / sizeof(m_DispatchTable[0]); nCommand++)
	{
		int nCommandLen = strlen(m_DispatchTable[nCommand].pszCommand);

		if (!_strnicmp(pszCommand, m_DispatchTable[nCommand].pszCommand, nCommandLen))
		{
			return((this->*m_DispatchTable[nCommand].pfnHandler)(m_DispatchTable[nCommand].pszCommand, &pszCommand[nCommandLen]));
		}
	}

	return(false);
}


//-----------------------------------------------------------------------------
// Purpose: Sets the map document that this shell should operate on.
// Input  : pDoc - Pointer to document.
//-----------------------------------------------------------------------------
void CShell::SetDocument(CMapDoc *pDoc)
{
	m_pDoc = pDoc;
}