/*
 * 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 {
	public static function getClass<T>(o:T):Null<Class<T>>
		untyped {
			var cname = __global__["flash.utils.getQualifiedClassName"](o);
			if (cname == "null" || cname == "Object" || cname == "int" || cname == "Number" || cname == "Boolean")
				return null;
			if (o.hasOwnProperty("prototype"))
				return null;
			var c = __as__(__global__["flash.utils.getDefinitionByName"](cname), Class);
			if (c.__isenum)
				return null;
			return c;
		}

	public static function getEnum(o:EnumValue):Null<Enum<Dynamic>>
		untyped {
			var cname = __global__["flash.utils.getQualifiedClassName"](o);
			if (cname == "null" || cname.substr(0, 8) == "builtin.")
				return null;
			// getEnum(Enum) should be null
			if (o.hasOwnProperty("prototype"))
				return null;
			var c = __as__(__global__["flash.utils.getDefinitionByName"](cname), Class);
			if (!c.__isenum)
				return null;
			return c;
		}

	public static function getSuperClass(c:Class<Dynamic>):Null<Class<Dynamic>>
		untyped {
			var cname = __global__["flash.utils.getQualifiedSuperclassName"](c);
			if (cname == null || cname == "Object")
				return null;
			return __as__(__global__["flash.utils.getDefinitionByName"](cname), Class);
		}

	public static function getClassName(c:Class<Dynamic>):String {
		if (c == null)
			return null;
		var str:String = untyped __global__["flash.utils.getQualifiedClassName"](c);
		switch (str) {
			case "int":
				return "Int";
			case "Number":
				return "Float";
			case "Boolean":
				return "Bool";
			case _:
				var idx = str.lastIndexOf("::");
				if (idx == -1) {
					return str;
				} else {
					return str.substring(0, idx) + "." + str.substring(idx + 2);
				}
		}
	}

	public static function getEnumName(e:Enum<Dynamic>):String {
		return getClassName(cast e);
	}

	public static function resolveClass(name:String):Null<Class<Dynamic>>
		untyped {
			var cl:Class<Dynamic>;
			try {
				cl = __as__(__global__["flash.utils.getDefinitionByName"](name), Class);
				if (cl.__isenum)
					return null;
				return cl; // skip test below
			} catch (e:Dynamic) {
				switch (name) {
					case "Int":
						return Int;
					case "Float":
						return Float;
				}
				return null;
			}
			// ensure that this is a class
			if (cl == null || cl.__name__ == null)
				return null;
			return cl;
		}

	public static function resolveEnum(name:String):Null<Enum<Dynamic>>
		untyped {
			var e:Dynamic;
			try {
				e = __global__["flash.utils.getDefinitionByName"](name);
				if (!e.__isenum)
					return null;
				return e;
			} catch (e:Dynamic) {
				if (name == "Bool")
					return Bool;
				return null;
			}
			// ensure that this is an enum
			if (e == null || e.__ename__ == null)
				return null;
			return e;
		}

	public static function createInstance<T>(cl:Class<T>, args:Array<Dynamic>):T
		untyped {
			return switch (args.length) {
				case 0: __new__(cl);
				case 1: __new__(cl, args[0]);
				case 2: __new__(cl, args[0], args[1]);
				case 3: __new__(cl, args[0], args[1], args[2]);
				case 4: __new__(cl, args[0], args[1], args[2], args[3]);
				case 5: __new__(cl, args[0], args[1], args[2], args[3], args[4]);
				case 6: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5]);
				case 7: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
				case 8: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);
				case 9: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8]);
				case 10: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9]);
				case 11: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10]);
				case 12: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11]);
				case 13: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12]);
				case 14: __new__(cl, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10], args[11], args[12],
						args[13]);
				default: throw "Too many arguments";
			}
		}

	public static function createEmptyInstance<T>(cl:Class<T>):T
		untyped {
			try {
				flash.Boot.skip_constructor = true;
				var i = __new__(cl);
				flash.Boot.skip_constructor = false;
				return i;
			} catch (e:Dynamic) {
				flash.Boot.skip_constructor = false;
				throw e;
			}
			return null;
		}

	public static function createEnum<T>(e:Enum<T>, constr:String, ?params:Array<Dynamic>):T {
		var f:Dynamic = untyped e[constr];
		if (f == null)
			throw "No such constructor " + constr;
		if (Reflect.isFunction(f)) {
			if (params == null)
				throw "Constructor " + constr + " need parameters";
			return Reflect.callMethod(e, f, params);
		}
		if (params != null && params.length != 0)
			throw "Constructor " + constr + " does not need parameters";
		return f;
	}

	public static function createEnumIndex<T>(e:Enum<T>, index:Int, ?params:Array<Dynamic>):T {
		var c:String = (untyped e.__constructs__)[index];
		if (c == null)
			throw index + " is not a valid enum constructor index";
		return createEnum(e, c, params);
	}

	static function describe(t:Dynamic, fact:Bool):Array<String>
		untyped {
			var fields = new Array();
			var xml:flash.xml.XML = __global__["flash.utils.describeType"](t);
			if (fact)
				xml = xml.factory[0];
			var methods = xml.child("method");
			for (i in 0...methods.length())
				fields.push(Std.string(methods[i].attribute("name")));
			var vars = xml.child("variable");
			for (i in 0...vars.length())
				fields.push(Std.string(vars[i].attribute("name")));
			var accs = xml.child("accessor");
			for (i in 0...accs.length())
				fields.push(Std.string(accs[i].attribute("name")));
			return fields;
		}

	public static function getInstanceFields(c:Class<Dynamic>):Array<String> {
		return describe(c, true);
	}

	public static function getClassFields(c:Class<Dynamic>):Array<String> {
		var a = describe(c, false);
		a.remove("__construct__");
		a.remove("prototype");
		return a;
	}

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

	public static function typeof(v:Dynamic):ValueType
		untyped {
			var cname = __global__["flash.utils.getQualifiedClassName"](v);
			switch (cname) {
				case "null":
					return TNull;
				case "void":
					return TNull; // undefined
				case "int":
					return TInt;
				case "Number":
					// integers >28 bits are stored as Numbers in avm2
					if ((v < -0x10000000 || v >= 0x10000000) && Std.int(v) == v)
						return TInt;
					return TFloat;
				case "Boolean":
					return TBool;
				case "Object":
					return TObject;
				case "Function":
					return TFunction;
				default:
					var c:Dynamic = null;
					try {
						c = __global__["flash.utils.getDefinitionByName"](cname);
						if (v.hasOwnProperty("prototype"))
							return TObject;
						if (c.__isenum)
							return TEnum(c);
						return TClass(c);
					} catch (e:Dynamic) {
						if (cname == "builtin.as$0::MethodClosure" || cname.indexOf("-") != -1)
							return TFunction;
						return if (c == null) TFunction else TClass(c);
					}
			}
			return null;
		}

	public static function enumEq<T>(a:T, b:T):Bool
		untyped {
			if (a == b)
				return true;
			try {
				if (a.index != b.index)
					return false;
				var ap:Array<Dynamic> = a.params;
				var bp:Array<Dynamic> = b.params;
				for (i in 0...ap.length)
					if (!enumEq(ap[i], bp[i]))
						return false;
			} catch (e:Dynamic) {
				return false;
			}
			return true;
		}

	public static function enumConstructor(e:EnumValue):String {
		return untyped e.tag;
	}

	public static function enumParameters(e:EnumValue):Array<Dynamic> {
		return untyped if (e.params == null) [] else e.params;
	}

	extern public inline static function enumIndex(e:EnumValue):Int {
		return untyped e.index;
	}

	public static function allEnums<T>(e:Enum<T>):Array<T> {
		var all = [];
		var cst:Array<String> = untyped e.__constructs__;
		for (c in cst) {
			var v = Reflect.field(e, c);
			if (!Reflect.isFunction(v))
				all.push(v);
		}
		return all;
	}
}
