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import std.bigint : BigInt;
import spots : OverlaySource, Spot;
import std.stdio;
import std.format;
struct Portal {
BigInt y;
BigInt x;
Portal* pair;
this(BigInt y, BigInt x) {
this.y = y;
this.x = x;
}
void pairWith(ref Portal p) {
this.pair = &p;
p.pair = &this;
}
void buildMap(ref int[Portal* ] idMap, ref int highId) {
idMap[&this] = highId++;
}
string toString(int[Portal* ] idMap)
in {
assert(pair in idMap);
}
do {
return format!`%s, %s: %d`(y, x, idMap[pair]);
}
void fromString(string s, Portal[int] portalsById) {
import std.conv : to;
import std.algorithm : until, findSkip;
import std.array : array;
this.y = to!BigInt(s.until(',').array);
s.findSkip(", ");
this.x = to!BigInt(s.until(':').array);
s.findSkip(": ");
int id;
s.formattedRead!"%d"(id);
auto p = id in portalsById;
if (p) {
p.pairWith(this); // this is a REALLY big bug. Portal() is
// being copied by value into the dict,
// so it's not using its final ref.
}
}
}
class Portals {
private Portal[int] _portals;
private Portal* _lastPortal;
private int _nextId;
private OverlaySource _overlay;
this(OverlaySource overlay) {
_overlay = overlay;
}
int add(BigInt y, BigInt x) {
_portals[_nextId] = Portal(y, x);
if (_lastPortal && _lastPortal.pair == null) {
_lastPortal.pairWith(_portals[_nextId]);
}
_lastPortal = &(_portals[_nextId]);
_overlay[y, x] = Spot('/', _nextId);
return _nextId++;
}
Portal get(int id)
in {
assert(id in _portals);
}
do {
return _portals[id];
}
void remove(BigInt y, BigInt x) {
auto id = _overlay[y, x].id;
auto pair = _portals[id].pair;
if (pair) {
if (_lastPortal.pair == null) {
_lastPortal.pairWith(*pair);
} else {
pair.pair = null;
}
}
_lastPortal = _portals[id].pair;
_portals.remove(id);
_overlay[y, x] = Spot(' ');
}
immutable string terminator = "END PORTAL DATA\n";
void save(File f) {
int id = 0;
int[Portal* ] idMap;
foreach (ref key; _portals.byKey()) {
(key in _portals).buildMap(idMap, id);
}
foreach (ref key; _portals.byKey()) {
auto portalRef = key in _portals;
f.writefln!`%d @ %s`(idMap[portalRef], portalRef.toString(idMap));
}
f.write(terminator);
if (_lastPortal)
f.writefln!`%d`(idMap[_lastPortal]);
}
void load(File f) {
_nextId = 0;
foreach (char[] line; f.lines) {
if (line == terminator)
break;
int id;
string portalText;
line.formattedRead!`%d @ %s`(id, portalText);
_portals[id] = Portal();
_portals[id].fromString(portalText, _portals);
_nextId++;
}
int id;
if (_nextId > 0) {
f.readf("%d\n", id);
_lastPortal = &(_portals[id]);
}
}
unittest {
import spots : RandomSource;
import std.stdio;
auto overlay = new OverlaySource(new RandomSource());
auto portals = new Portals(overlay);
portals.add(BigInt(0), BigInt(0));
portals.remove(BigInt(0), BigInt(0));
int orig = portals.add(BigInt(0), BigInt(0));
int sec = portals.add(BigInt(0), BigInt(1));
assert(*(portals.get(orig).pair) == portals.get(sec));
portals.remove(BigInt(0), BigInt(1));
sec = portals.add(BigInt(0), BigInt(2));
assert(*(portals.get(orig).pair) == portals.get(sec));
orig = portals.add(BigInt(0), BigInt(3));
portals.remove(BigInt(0), BigInt(0));
assert(*(portals.get(orig).pair) == portals.get(sec));
}
}
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