/*
 * 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.
 */

package lua;

import haxe.Constraints.Function;
import haxe.SysTools;

@:dox(hide)
class Boot {
	// Used temporarily for bind()
	static var _:Dynamic;
	static var _fid = 0;

	static var Max_Int32 = 2147483647;
	static var Min_Int32 = -2147483648;


	// A max stack size to respect for unpack operations
	public static var MAXSTACKSIZE(default, null) = 1000;

	public static var platformBigEndian = NativeStringTools.byte(NativeStringTools.dump(function() {}), 7) > 0;

	static var hiddenFields:Table<String,
		Bool> = untyped __lua__("{__id__=true, hx__closures=true, super=true, prototype=true, __fields__=true, __ifields__=true, __class__=true, __properties__=true}");

	static function __unhtml(s:String)
		return s.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");

	/**
		Indicates if the given object is a class.
	**/
	static inline public function isClass(o:Dynamic):Bool {
		if (Lua.type(o) != "table")
			return false;
		else
			return untyped __define_feature__("lua.Boot.isClass", o.__name__);
	}

	/**
		Indicates if the given object is a enum.
	**/
	static inline public function isEnum(e:Dynamic):Bool {
		if (Lua.type(e) != "table")
			return false;
		else
			return untyped __define_feature__("lua.Boot.isEnum", e.__ename__);
	}

	/**
		Returns the class of a given object, and defines the getClass feature
		for the given class.
	**/
	static inline public function getClass(o:Dynamic):Class<Dynamic> {
		if (Std.is(o, Array))
			return Array;
		else if (Std.is(o, String))
			return String;
		else {
			var cl = untyped __define_feature__("lua.Boot.getClass", o.__class__);
			if (cl != null)
				return cl;
			else
				return null;
		}
	}

	/**
		Indicates if the given object is an instance of the given Type
	**/
	@:ifFeature("typed_catch")
	private static function __instanceof(o:Dynamic, cl:Dynamic) {
		if (cl == null)
			return false;

		switch (cl) {
			case Int:
				return (Lua.type(o) == "number" && clampInt32(o) == o);
			case Float:
				return Lua.type(o) == "number";
			case Bool:
				return Lua.type(o) == "boolean";
			case String:
				return Lua.type(o) == "string";
			case Thread:
				return Lua.type(o) == "thread";
			case UserData:
				return Lua.type(o) == "userdata";
			case Array:
				return isArray(o);
			case Table:
				return Lua.type(o) == "table";
			case Dynamic:
				return o != null;
			default:
				{
					if (o != null && Lua.type(o) == "table" && Lua.type(cl) == "table") {
						if (extendsOrImplements(getClass(o), cl))
							return true;
						// We've exhausted standard inheritance checks.  Check for simple Class/Enum eqauality
						// Also, do not use isClass/isEnum here, perform raw checks
						untyped __feature__("Class.*", if (cl == Class && o.__name__ != null) return true);
						untyped __feature__("Enum.*", if (cl == Enum && o.__ename__ != null) return true);
						// last chance, is it an enum instance?
						return o.__enum__ == cl;
					} else {
						return false;
					}
				}
		}
	}

	static function isArray(o:Dynamic):Bool {
		return Lua.type(o) == "table"
			&& untyped o.__enum__ == null && Lua.getmetatable(o) != null && Lua.getmetatable(o).__index == untyped Array.prototype;
	}

	/**
		Indicates if the given object inherits from the given class
	**/
	static function inheritsFrom(o:Dynamic, cl:Class<Dynamic>):Bool {
		while (Lua.getmetatable(o) != null && Lua.getmetatable(o).__index != null) {
			if (Lua.getmetatable(o).__index == untyped cl.prototype)
				return true;
			o = Lua.getmetatable(o).__index;
		}
		return false;
	}

	@:ifFeature("typed_cast")
	private static function __cast(o:Dynamic, t:Dynamic) {
		if (o == null || __instanceof(o, t))
			return o;
		else
			throw "Cannot cast " + Std.string(o) + " to " + Std.string(t);
	}

	/**
		Helper method to generate a string representation of an enum
	**/
	static function printEnum(o:Array<Dynamic>, s:String) {
		if (o.length == 2) {
			return o[0];
		} else {
			// parameterized enums are arrays
			var str = o[0] + "(";
			s += "\t";
			for (i in 2...o.length) {
				if (i != 2)
					str += "," + __string_rec(o[i], s);
				else
					str += __string_rec(o[i], s);
			}
			return str + ")";
		}
	}

	/**
		Helper method to generate a string representation of a class
	**/
	static inline function printClass(c:Table<String, Dynamic>, s:String):String {
		return '{${printClassRec(c, '', s)}}';
	}

	/**
		Helper method to generate a string representation of a class
	**/
	static function printClassRec(c:Table<String, Dynamic>, result = '', s:String):String {
		var f = Boot.__string_rec;
		untyped __lua__("for k,v in pairs(c) do if result ~= '' then result = result .. ', ' end result = result .. k .. ':' .. f(v, s.. '\t') end");
		return result;
	}

	/**
		Generate a string representation for arbitrary object.
	**/
	@:ifFeature("has_enum")
	static function __string_rec(o:Dynamic, s:String = "") {
		if (s.length >= 5)
			return "<...>";
		return switch (untyped __type__(o)) {
			case "nil": "null";
			case "number": {
					if (o == std.Math.POSITIVE_INFINITY)
						"Infinity";
					else if (o == std.Math.NEGATIVE_INFINITY)
						"-Infinity";
					else if (o == 0)
						"0";
					else if (o != o)
						"NaN";
					else
						untyped tostring(o);
				}
			case "boolean": untyped tostring(o);
			case "string": o;
			case "userdata": {
					var mt = lua.Lua.getmetatable(o);
					if (mt != null && mt.__tostring != null) {
						lua.Lua.tostring(o);
					} else {
						"<userdata>";
					}
				}
			case "function": "<function>";
			case "thread": "<thread>";
			case "table": {
					if (o.__enum__ != null)
						printEnum(o, s);
					else if (o.toString != null && !isArray(o))
						o.toString();
					else if (isArray(o)) {
						var o2:Array<Dynamic> = untyped o;
						if (s.length > 5)
							"[...]"
						else
							'[${[for (i in o2) __string_rec(i, s + 1)].join(",")}]';
					} else if (o.__class__ != null)
						printClass(o, s + "\t");
					else {
						var fields = fieldIterator(o);
						var buffer:Table<Int, String> = Table.create();
						var first = true;
						Table.insert(buffer, "{ ");
						for (f in fields) {
							if (first)
								first = false;
							else
								Table.insert(buffer, ", ");
							Table.insert(buffer, '${Std.string(f)} : ${untyped __string_rec(o[f], s + "\t")}');
						}
						Table.insert(buffer, " }");
						Table.concat(buffer, "");
					}
				};
			default: {
					throw "Unknown Lua type";
					null;
				}
		}
	}

	/**
		Define an array from the given table
	**/
	public inline static function defArray<T>(tab:Table<Int, T>, ?length:Int):Array<T> {
		if (length == null) {
			length = TableTools.maxn(tab);
			if (length > 0) {
				var head = tab[1];
				Table.remove(tab, 1);
				tab[0] = head;
				return untyped _hx_tab_array(tab, length);
			} else {
				return [];
			}
		} else {
			return untyped _hx_tab_array(tab, length);
		}
	}

	/**
		Create a Haxe object from the given table structure
	**/
	public inline static function tableToObject<T>(t:Table<String, T>):Dynamic<T> {
		return untyped _hx_o(t);
	}

	/**
		Get Date object as string representation
	**/
	public static function dateStr(date:std.Date):String {
		var m = date.getMonth() + 1;
		var d = date.getDate();
		var h = date.getHours();
		var mi = date.getMinutes();
		var s = date.getSeconds();
		return date.getFullYear() + "-" + (if (m < 10) "0" + m else "" + m) + "-" + (if (d < 10) "0" + d else "" + d) + " "
			+ (if (h < 10) "0" + h else "" + h) + ":" + (if (mi < 10) "0" + mi else "" + mi) + ":" + (if (s < 10) "0" + s else "" + s);
	}

	/**
		A 32 bit clamp function for numbers
	**/
	public inline static function clampInt32(x:Float) {
#if lua_vanilla
		if (x < Min_Int32 ) {
			return Min_Int32;
		} else if (x > Max_Int32) {
			return Max_Int32;
		} else {
			return Math.floor(x);
		}
#else
		return untyped __define_feature__("lua.Boot.clamp", _hx_bit_clamp(x));
#end
	}

	/**
		Create a standard date object from a lua string representation
	**/
	public static function strDate(s:String):std.Date {
		switch (s.length) {
			case 8: // hh:mm:ss
				var k = s.split(":");
				return std.Date.fromTime(Lua.tonumber(k[0]) * 3600000. + Lua.tonumber(k[1]) * 60000. + Lua.tonumber(k[2]) * 1000.);
			case 10: // YYYY-MM-DD
				var k = s.split("-");
				return new std.Date(Lua.tonumber(k[0]), Lua.tonumber(k[1]) - 1, Lua.tonumber(k[2]), 0, 0, 0);
			case 19: // YYYY-MM-DD hh:mm:ss
				var k = s.split(" ");
				var y = k[0].split("-");
				var t = k[1].split(":");
				return new std.Date(Lua.tonumber(y[0]), Lua.tonumber(y[1]) - 1, Lua.tonumber(y[2]), Lua.tonumber(t[0]), Lua.tonumber(t[1]), Lua.tonumber(t[2]));
			default:
				throw "Invalid date format : " + s;
		}
	}

	/**
		Helper method to determine if class cl1 extends, implements, or otherwise equals cl2
	**/
	public static function extendsOrImplements(cl1:Class<Dynamic>, cl2:Class<Dynamic>):Bool {
		if (cl1 == null || cl2 == null)
			return false;
		else if (cl1 == cl2)
			return true;
		else if (untyped cl1.__interfaces__ != null) {
			var intf = untyped cl1.__interfaces__;
			for (i in 1...(TableTools.maxn(intf) + 1)) {
				// check each interface, including extended interfaces
				if (extendsOrImplements(intf[i], cl2))
					return true;
			}
		}
		// check standard inheritance
		return extendsOrImplements(untyped cl1.__super__, cl2);
	}

	/**
		Returns a shell escaped version of "cmd" along with any args
	**/
	public static function shellEscapeCmd(cmd:String, ?args:Array<String>) {
		if (args != null) {
			switch (Sys.systemName()) {
				case "Windows":
					cmd = [
						for (a in [StringTools.replace(cmd, "/", "\\")].concat(args))
							SysTools.quoteWinArg(a, true)
					].join(" ");
				case _:
					cmd = [cmd].concat(args).map(SysTools.quoteUnixArg).join(" ");
			}
		}
		return cmd;
	}

	/**
		Returns a temp file path that can be used for reading and writing
	**/
	public static function tempFile():String {
		switch (Sys.systemName()) {
			case "Windows":
				return haxe.io.Path.join([Os.getenv("TMP"), Os.tmpname()]);
			default:
				return Os.tmpname();
		}
	}

	public static function fieldIterator(o:Table<String, Dynamic>):Iterator<String> {
		if (Lua.type(o) != "table") {
			return {
				next: function() return null,
				hasNext: function() return false
			}
		}
		var tbl:Table<String, String> = cast(untyped o.__fields__ != null) ? o.__fields__ : o;
		var cur = Lua.pairs(tbl).next;
		var next_valid = function(tbl, val) {
			while (hiddenFields[untyped val] != null) {
				val = cur(tbl, val).index;
			}
			return val;
		}
		var cur_val = next_valid(tbl, cur(tbl, null).index);
		return {
			next: function() {
				var ret = cur_val;
				cur_val = next_valid(tbl, cur(tbl, cur_val).index);
				return ret;
			},
			hasNext: function() return cur_val != null
		}
	}

	static var os_patterns = [
		'Windows' => ['windows', '^mingw', '^cygwin'],
		'Linux' => ['linux'],
		'Mac' => ['mac', 'darwin', 'osx'],
		'BSD' => ['bsd$'],
		'Solaris' => ['SunOS']
	];

	public static function systemName():String {
		var os:String = null;
		if (untyped jit != null && untyped jit.os != null) {
			os = untyped jit.os;
			os = os.toLowerCase();
		} else {
			var popen_status:Bool = false;
			var popen_result:lua.FileHandle = null;
			untyped __lua__("popen_status, popen_result = pcall(_G.io.popen, '')");
			if (popen_status) {
				popen_result.close();
				os = lua.Io.popen('uname -s', 'r').read('*l').toLowerCase();
			} else {
				os = lua.Os.getenv('OS').toLowerCase();
			}
		}

		for (k in os_patterns.keys()) {
			for (p in os_patterns.get(k)) {
				if (lua.NativeStringTools.match(os, p) != null) {
					return k;
				}
			}
		}

		return null;
	}
}