package haxe.ds;

@:coreApi
class WeakMap<K:{},V> extends flash.utils.Dictionary implements haxe.Constraints.IMap<K,V> {

	public function new() {
		super(true);
	}

	public inline function get( key : K ) : Null<V> {
		return untyped this[key];
	}

	public inline function set( key : K, value : V ):Void {
		untyped this[key] = value;
	}

	public inline function exists( key : K ) : Bool {
		return untyped this[key] != null;
	}

	public function remove( key : K ):Bool {
		var has = exists(key);
		untyped __delete__(this, key);
		return has;
	}

	#if as3

 	public function keys() : Iterator<K> {
		return untyped __keys__(this).iterator();
 	}

 	public function iterator() : Iterator<V> {
		var ret = [];
		for (i in keys())
			ret.push(get(i));
		return ret.iterator();
 	}
	#else

	public function keys() : Iterator<K> {
		return NativePropertyIterator.iterator(this);
	}

	public function iterator() : Iterator<V> {
		return NativeValueIterator.iterator(this);
	}

	#end

	public function toString() : String {
		var s = "";
		var it = keys();
		for( i in it ) {
			s += (s == "" ? "" : ",") + Std.string(i);
			s += " => ";
			s += Std.string(get(i));
		}
		return s + "}";
	}
}

private class NativePropertyIterator {
	var collection:Dynamic;
	var index:Int = 0;

	public static inline function iterator(collection:Dynamic):NativePropertyIterator {
		var result = new NativePropertyIterator();
		result.collection = collection;
		return result;
	}

	function new() {}

	public inline function hasNext():Bool {
		var c = collection;
		var i = index;
		var result = untyped __has_next__(c, i);
		collection = c;
		index = i;
		return result;
	}

	public inline function next():Dynamic {
		var i = index;
		var result = untyped __forin__(collection, i);
		index = i;
		return result;
	}
}

private class NativeValueIterator {
	var collection:Dynamic;
	var index:Int = 0;

	public static inline function iterator(collection:Dynamic):NativeValueIterator {
		var result = new NativeValueIterator();
		result.collection = collection;
		return result;
	}

	function new() {}

	public inline function hasNext():Bool {
		var c = collection;
		var i = index;
		var result = untyped __has_next__(c, i);
		collection = c;
		index = i;
		return result;
	}

	public inline function next():Dynamic {
		var i = index;
		var result = untyped __foreach__(collection, i);
		index = i;
		return result;
	}
}
