/*
 * Copyright (C)2005-2019 Haxe Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
enum ValueType {
	TNull;
	TInt;
	TFloat;
	TBool;
	TObject;
	TFunction;
	TClass(c:Class<Dynamic>);
	TEnum(e:Enum<Dynamic>);
	TUnknown;
}

@:coreApi
class Type {
	static var allTypes(get, never):hl.types.BytesMap;

	static inline function get_allTypes():hl.types.BytesMap
		return untyped $allTypes();

	@:keep static function init():Bool {
		if( allTypes != null )
			return false;
		untyped $allTypes(new hl.types.BytesMap());
		return true;
	}

	@:keep static function initClass(ct:hl.Type, t:hl.Type, name:hl.Bytes):hl.BaseType.Class@:privateAccess {
		var c:hl.BaseType.Class = cast t.getGlobal();
		if( c != null )
			return c;
		c = ct.allocObject();
		t.setGlobal(c);
		c.__type__ = t;
		c.__name__ = String.fromUCS2(name);
		register(name, c);
		return c;
	}

	@:keep static function initEnum(et:hl.Type, t:hl.Type):hl.BaseType.Enum@:privateAccess {
		var e:hl.BaseType.Enum = cast t.getGlobal();
		if( e != null )
			return e;
		e = et.allocObject();
		e.__type__ = t;
		e.__evalues__ = t.getEnumValues();
		e.__ename__ = t.getTypeName();
		e.__emap__ = new hl.types.BytesMap();
		e.__constructs__ = new Array();
		var cl = t.getEnumFields();
		for (i in 0...cl.length) {
			var name = cl[i];
			e.__emap__.set(name, i);
			e.__constructs__.push(String.fromUCS2(name));
		}
		register(e.__ename__.bytes, e);
		t.setGlobal(e);
		return e;
	}

	@:keep static function register(b:hl.Bytes, t:hl.BaseType):Void {
		allTypes.set(b, t);
	}

	public static function getClass<T>(o:T):Null<Class<T>> {
		var t = hl.Type.getDynamic(o);
		if (t.kind == HVirtual) {
			o = hl.Api.getVirtualValue(o);
			t = hl.Type.getDynamic(o);
		}
		if (t.kind == HObj)
			return t.getGlobal();
		return null;
	}

	public static function getEnum(o:EnumValue):Null<Enum<Dynamic>> {
		var t = hl.Type.getDynamic(o);
		if (t.kind == HEnum)
			return t.getGlobal();
		return null;
	}

	public static function getSuperClass(c:Class<Dynamic>):Null<Class<Dynamic>>@:privateAccess {
		var c:hl.BaseType.Class = cast c;
		var t = c.__type__.getSuper();
		return t == hl.Type.void() ? null : t.getGlobal();
	}

	public static function getClassName(c:Class<Dynamic>):String {
		var c:hl.BaseType.Class = cast c;
		return c.__name__;
	}

	public static function getEnumName(e:Enum<Dynamic>):String {
		var e:hl.BaseType.Enum = cast e;
		return e.__ename__;
	}

	public static function resolveClass(name:String):Null<Class<Dynamic>> {
		var t:hl.BaseType = allTypes.get(@:privateAccess name.bytes);
		if (t == null || !Std.isOfType(t, hl.BaseType.Class))
			return null;
		return cast t;
	}

	public static function resolveEnum(name:String):Null<Enum<Dynamic>> {
		var t:hl.BaseType = allTypes.get(@:privateAccess name.bytes);
		if (t == null || !Std.isOfType(t, hl.BaseType.Enum))
			return null;
		return cast t;
	}

	public static function createInstance<T>(cl:Class<T>, args:Array<Dynamic>):T {
		var c:hl.BaseType.Class = cast cl;
		var t = c.__type__;
		if (t == hl.Type.get((null : hl.types.ArrayBase.ArrayAccess)))
			return cast new Array<Dynamic>();
		var o = t.allocObject();
		if (c.__constructor__ != null) {
			var v:Dynamic = hl.Api.noClosure(c.__constructor__);
			var args = args.copy();
			args.unshift(o);
			Reflect.callMethod(null, v, args);
		}
		return o;
	}

	public static function createEmptyInstance<T>(cl:Class<T>):T {
		var c:hl.BaseType.Class = cast cl;
		return c.__type__.allocObject();
	}

	public static function createEnum<T>(e:Enum<T>, constr:String, ?params:Array<Dynamic>):T {
		var en:hl.BaseType.Enum = cast e;
		var idx:Null<Int> = en.__emap__.get(@:privateAccess constr.bytes);
		if (idx == null)
			throw "Unknown enum constructor " + en.__ename__ + "." + constr;
		return createEnumIndex(e, idx, params);
	}

	public static function createEnumIndex<T>(e:Enum<T>, index:Int, ?params:Array<Dynamic>):T {
		var e:hl.BaseType.Enum = cast e;
		if (index < 0 || index >= e.__constructs__.length)
			throw "Invalid enum index " + e.__ename__ + "." + index;
		if (params == null || params.length == 0) {
			var v = index >= e.__evalues__.length ? null : e.__evalues__[index];
			if (v == null)
				throw "Constructor " + e.__ename__ + "." + e.__constructs__[index] + " takes parameters";
			return v;
		}
		var a:hl.types.ArrayDyn = cast params;
		var narr;
		if (@:privateAccess !a.array.isArrayObj()) {
			narr = new hl.NativeArray<Dynamic>(a.length);
			for (i in 0...a.length)
				narr[i] = @:privateAccess a.array.getDyn(i);
		} else {
			var aobj:hl.types.ArrayObj<Dynamic> = cast @:privateAccess a.array;
			narr = @:privateAccess aobj.array;
		}
		var v = @:privateAccess e.__type__.allocEnum(index, narr, a.length);
		if (v == null)
			throw "Constructor " + e.__ename__ + "." + e.__constructs__[index] + " does not takes " + narr.length + " parameters";
		return v;
	}

	public static function getInstanceFields(c:Class<Dynamic>):Array<String>@:privateAccess {
		var c:hl.BaseType.Class = cast c;
		var fields = c.__type__.getInstanceFields();
		return [for (f in fields) String.fromUCS2(f)];
	}

	public static function getClassFields(c:Class<Dynamic>):Array<String> {
		var c:hl.BaseType.Class = cast c;
		var fields = @:privateAccess Reflect.getObjectFields(c);
		var fields = [for (f in fields) @:privateAccess String.fromUCS2(f)];
		fields.remove("__constructor__");
		fields.remove("__meta__");
		fields.remove("__name__");
		fields.remove("__type__");
		fields.remove("__implementedBy__");
		return fields;
	}

	public static function getEnumConstructs(e:Enum<Dynamic>):Array<String> {
		var e:hl.BaseType.Enum = cast e;
		return e.__constructs__.copy();
	}

	public static function typeof(v:Dynamic):ValueType {
		var t = hl.Type.getDynamic(v);
		switch (t.kind) {
			case HVoid:
				return TNull;
			case HUI8, HUI16, HI32, HI64:
				return TInt;
			case HF32, HF64:
				return (v : Int) == (v:Float) ? TInt : TFloat;
			case HBool:
				return TBool;
			case HDynObj:
				return TObject;
			case HObj:
				var c:Dynamic = Type.getClass(v);
				if (c == Class || c == null)
					return TObject;
				return TClass(c);
			case HEnum:
				return TEnum(Type.getEnum(v));
			case HFun:
				return TFunction;
			case HVirtual:
				var v = hl.Api.getVirtualValue(v);
				if (v == null)
					return TObject;
				return typeof(v);
			default:
				return TUnknown;
		}
	}

	@:hlNative("std", "type_enum_eq")
	public static function enumEq<T:EnumValue>(a:T, b:T):Bool {
		return false;
	}

	public static function enumConstructor(e:EnumValue):String {
		var en:hl.BaseType.Enum = cast getEnum(e);
		return en.__constructs__[Type.enumIndex(e)];
	}

	@:hlNative("std", "enum_parameters")
	static function _enumParameters(e:EnumValue):hl.NativeArray<Dynamic> {
		return null;
	}

	public static function enumParameters(e:EnumValue):Array<Dynamic> {
		if( e == null ) (e:Dynamic)(); // trigger null access
		var arr = _enumParameters(e);
		return cast hl.types.ArrayObj.alloc(arr);
	}

	public static function enumIndex(e:EnumValue):Int {
		return untyped $enumIndex(e);
	}

	public static function allEnums<T>(e:Enum<T>):Array<T> {
		var en:hl.BaseType.Enum = cast e;
		var out = [];
		for (i in 0...en.__evalues__.length) {
			var v = en.__evalues__[i];
			if (v != null)
				out.push(v);
		}
		return out;
	}
}
