Modelbahn/server/railway.cc

#include "modelbahn.h"
#include "server.h"
#include "debug.h"

Railways::Railways() {
	debug (0, "* Railways Constructor");
	height = 0;
	width = 0;
	railways = NULL;
	mtx = { 0 };
	mtx = PTHREAD_MUTEX_INITIALIZER;
	changed = 0;
};


Railways::~Railways() {
	if (railways) free (railways);
	height = 0;
	width = 0;
};


//
// thread protection: lock
int Railways::Lock() {
	if (pthread_mutex_lock(&mtx) == 0) return 1;
	else return 0;
};


//
// thread protection: unlock
int Railways::UnLock() {
	if (pthread_mutex_unlock(&mtx) == 0) return 1;
	else return 0;
};



//
// return index inside the array (clip to boundery)
int Railways::GetRIdx(int x, int y) {
	int _x, _y;

	if (x < 0) _x = 0;
	else if (x >= width) _x = width-1;
	else _x = x;

	if (y < 0) _y = 0;
	else if (y >= height) _y = height-1;
	else _y = y;

	return (_x + _y * width);
};


//
// return JSON strign with the Railway data
// not thread safe !!!!
JSONParse Railways::_GetJSONRailway(int x, int y) {
	JSONParse json;
	JSONElement je;
	int idx = GetRIdx(x,y);
	string name = "";

	json.Clear();
	json.AddObject("x", x);
	json.AddObject("y", y);
	json.AddObject("dir", railways[idx].dir);
	json.AddObject("altdir", railways[idx].altdir);
	json.AddObject("type", railways[idx].type);
	json.AddObject("maxspeed", railways[idx].maxspeed);
	json.AddObject("flags", railways[idx].flags);
	name = railways[idx].name;
	json.AddObject("name", name);

	return json;
};


//
// return JSON strign with the Railway data
// thread safe.
JSONParse Railways::GetJSONRailway(int x, int y) {
	JSONParse json;

	Lock();
	json = _GetJSONRailway(x, y);
	UnLock();

	return json;
};


Railway Railways::GetRailwayFromJSON(JSONParse *j) {
	string name;
	Railway r = {
			type: RAILWAY_NOTHING,
			x: 0,
			y: 0,
			dir: 0,
			altdir: 0,
			maxspeed: -1,
			flags: 0
	};
	r.name[0] = 0;

	j->GetValueInt("x", &r.x);
	j->GetValueInt("y", &r.y);
	j->GetValueInt("dir", &r.dir);
	j->GetValueInt("altdir", &r.altdir);
	j->GetValueInt("type", &r.type);
	j->GetValueInt("maxspeed", &r.maxspeed);
	j->GetValueInt("flags", &r.flags);
	j->GetValue("name", &name);
	strncpy (r.name, name.c_str(), REFERENCENAME_LEN);

	return r;
};


//
// return some data about the railway/tracks
//
JSONParse Railways::GetJSONTrack() {
	JSONParse json;
	JSONParse jsondata;
	JSONElement je;

	json.Clear();
	json.AddObject("height", height);
	json.AddObject("width", width);

	return json;
};

//
// change railway
// return 1 on change
int Railways::Change(Railway *rw) {
	int x, y;
	int result = 1;
	JSONParse json;

	if (rw == NULL) return 0;
	Lock();

	if (rw->x < 0 || rw->x >= width) result = 0;
	else if (rw->y < 0 || rw->y >= height) result = 0;
	else if (rw->dir < 0 || rw->dir > 6) result = 0;
	else {
		changed = true;
		result = 1;

		if (rw->dir == 0) rw->type == RAILWAY_NOTHING;

		//
		// need to delete?
		if (rw->type == RAILWAY_NOTHING) {
			Railway *r = &railways[GetRIdx(rw->x, rw->y)];

			r->type = RAILWAY_NOTHING;
			r->dir = 0;
			r->altdir = 0;
			r->flags = 0;
			r->maxspeed = 0;
			r->x = rw->x;
			r->y = rw->y;
			r->name[0] = 0;
		}

		//
		// add normal railway
		else if (rw->type == RAILWAY_NORMAL) {
			railways[GetRIdx(rw->x, rw->y)] = *rw;
		}

		//
		// add normal railway
		else if (rw->type < RAILWAY_MAX) {
			railways[GetRIdx(rw->x, rw->y)] = *rw;
		}

		else {
			debug (DEBUG_INFO, "%s:%d add unknown %d,%d dir(%d) type:%d", __FILE__, __LINE__, rw->x, rw->y, rw->dir, rw->type);
		}
	}

	UnLock();
	return result;
};

//
// redefine the size of the track, keep data
void Railways::SetSize (int neww, int newh) {
	Railway *rarray = railways;
	int ow = width;
	int oh = height;
	int x, y;

	debug (0, "* Railways::SetSize (%d, %d)", neww, newh);

	Lock();

	//
	// old values saved during call up of the function, create new array for the railways data
	railways = NULL;
	_New (neww, newh);

	//
	// copy old data
	for (x = 0; x < ow && x < width; x++)
		for (y = 0; y < oh && x < height; y++)
			railways[x + y * width] = rarray[x + y * oh];
	free (rarray);
	UnLock();
};


void Railways::_New (int neww, int newh) {
	int x, y;

	debug (0, "* Railways New");

	//
	// clip to minimum and maximum sizes
	if (neww < RAILWAYS_MIN_WIDTH) width = RAILWAYS_MIN_WIDTH;
	else if (neww > RAILWAYS_MAX_WIDTH) width = RAILWAYS_MAX_WIDTH;
	else width = neww;
	if (newh < RAILWAYS_MIN_HEIGHT) width = RAILWAYS_MIN_HEIGHT;
	else if (newh > RAILWAYS_MAX_HEIGHT) width = RAILWAYS_MAX_HEIGHT;
	else height = newh;

	//
	// if memory is already allocated free it first
	if (railways != NULL) free (railways);

	//
	// allocate memory and reset memory
	railways = (Railway*) malloc (sizeof (Railway) * width * height);
	for (x = 0; x < width; x++) for (y = 0; y < height; y++) {
		Railway *r = &railways[GetRIdx(x, y)];
		r->type = RAILWAY_NOTHING;
		r->dir = 0;
		r->altdir = 0;
		r->flags = 0;
		r->maxspeed = 0;
		r->x = x;
		r->y = y;
		r->name[0] = 0;
	}
};

void Railways::New (int neww, int newh) {
	Lock();
	_New (neww, newh);
	UnLock();
};


//
// append all data to the givin jasonobject
void Railways::GetJSONAll(JSONParse *json) {
	int x, y;

	if (json == NULL) return;

	Lock();

	json->AddObject("track", GetJSONTrack());
	for (y = 0; y < height; y++)
		for (x = 0; x < width; x++)
			if (railways[GetRIdx(x, y)].type != RAILWAY_NOTHING) {
				json->AddObject("railway", _GetJSONRailway(x, y));
			}

	UnLock();
}

//
// get railway element
// thread safe
Railway Railways::Get(int x, int y) {
	Railway r;

	Lock();
	r = railways[GetRIdx(x, y)];
	UnLock();

	return r;
};