/*
 * 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.
 */

import lua.Boot;
import lua.NativeStringTools;

@:keepInit
@:coreApi class Std {
	public static inline function is(v:Dynamic, t:Dynamic):Bool {
		return untyped lua.Boot.__instanceof(v, t);
	}

	public static inline function downcast<T:{}, S:T>(value:T, c:Class<S>):S {
		return untyped lua.Boot.__instanceof(value, c) ? cast value : null;
	}

	@:deprecated('Std.instance() is deprecated. Use Std.downcast() instead.')
	public static inline function instance<T:{}, S:T>(value:T, c:Class<S>):S {
		return downcast(value, c);
	}

	@:keep
	public static function string(s:Dynamic):String {
		return untyped lua.Boot.__string_rec(s);
	}

	public static function int(x:Float):Int {
		if (!Math.isFinite(x) || Math.isNaN(x))
			return 0;
		else
			return lua.Boot.clampInt32(x);
	}

	public static function parseInt(x:String):Null<Int> {
		if (x == null)
			return null;
		var hexMatch = NativeStringTools.match(x, "^[ \t\r\n]*([%-+]*0[xX][%da-fA-F]*)");
		if (hexMatch != null) {
			var sign = switch StringTools.fastCodeAt(hexMatch, 0) {
				case '-'.code: -1;
				case '+'.code: 1;
				case _: 0;
			}
			return (sign == -1 ? -1 : 1) * lua.Lua.tonumber(hexMatch.substr(sign == 0 ? 2 : 3), 16);
		} else {
			var intMatch = NativeStringTools.match(x, "^ *[%-+]?%d*");
			if (intMatch != null) {
				return lua.Lua.tonumber(intMatch);
			} else {
				return null;
			}
		}
	}

	public static function parseFloat(x:String):Float {
		if (x == null || x == "")
			return Math.NaN;
		var digitMatch = NativeStringTools.match(x, "^ *[%.%-+]?[0-9]%d*");
		if (digitMatch == null) {
			return Math.NaN;
		}
		x = x.substr(digitMatch.length);

		var decimalMatch = NativeStringTools.match(x, "^%.%d*");
		if (decimalMatch == null)
			decimalMatch = "";
		x = x.substr(decimalMatch.length);

		var eMatch = NativeStringTools.match(x, "^[eE][+%-]?%d+");
		if (eMatch == null)
			eMatch = "";
		var result = lua.Lua.tonumber(digitMatch + decimalMatch + eMatch);
		return result != null ? result : Math.NaN;
	}

	public static function random(x:Int):Int {
		return untyped x <= 0 ? 0 : Math.floor(Math.random() * x);
	}

	static function __init__():Void
		untyped {
			__feature__("lua.Boot.isClass", String.__name__ = __feature__("Type.getClassName", "String", true));
			__feature__("Type.resolveClass", _hxClasses["Array"] = Array);
			__feature__("lua.Boot.isClass", Array.__name__ = __feature__("Type.getClassName", "Array", true));
		}
}
