/*
 * 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 sys.db;

private class D {
	static function load(fun, args):Dynamic {
		return neko.Lib.load(lib, fun, args);
	}

	static var lib = try {
		neko.Lib.load("mysql5", "connect", 1);
		"mysql5";
	} catch (e:Dynamic) "mysql";
	public static var connect = load("connect", 1);
	public static var select_db = load("select_db", 2);
	public static var request = load("request", 2);
	public static var close = load("close", 1);
	public static var escape = load("escape", 2);
	public static var set_conv_funs = load("set_conv_funs", 4);
	public static var result_get_length = load("result_get_length", 1);
	public static var result_get_nfields = load("result_get_nfields", 1);
	public static var result_next = load("result_next", 1);
	public static var result_get = load("result_get", 2);
	public static var result_get_int = load("result_get_int", 2);
	public static var result_get_float = load("result_get_float", 2);
	public static var result_fields_names = neko.Lib.loadLazy(lib, "result_get_fields_names", 1);
}

private class MysqlResultSet implements sys.db.ResultSet {
	public var length(get, null):Int;
	public var nfields(get, null):Int;

	private var __r:Dynamic;
	private var cache:Dynamic;

	public function new(r) {
		__r = r;
	}

	private function get_length() {
		return D.result_get_length(__r);
	}

	private function get_nfields() {
		return D.result_get_nfields(__r);
	}

	public function hasNext() {
		if (cache == null)
			cache = next();
		return (cache != null);
	}

	public function next():Dynamic {
		var c = cache;
		if (c != null) {
			cache = null;
			return c;
		}
		c = D.result_next(__r);
		return c;
	}

	public function results():List<Dynamic> {
		var l = new List();
		while (hasNext())
			l.add(next());
		return l;
	}

	public function getResult(n:Int) {
		return new String(D.result_get(__r, n));
	}

	public function getIntResult(n:Int):Int {
		return D.result_get_int(__r, n);
	}

	public function getFloatResult(n:Int):Float {
		return D.result_get_float(__r, n);
	}

	public function getFieldsNames():Array<String> {
		var a = D.result_fields_names(__r);
		untyped {
			var i = 0;
			var l = __dollar__asize(a);
			while (i < l) {
				a[i] = new String(a[i]);
				i += 1;
			}
			a = Array.new1(cast a, l);
		}
		return a;
	}
}

private class MysqlConnection implements sys.db.Connection {
	private var __c:Dynamic;

	public function new(c) {
		__c = c;
		D.set_conv_funs(c, function(s) return new String(s), function(d) return untyped Date.new1(d), function(b) return haxe.io.Bytes.ofData(b));
	}

	public function request(s:String):sys.db.ResultSet {
		try {
			var r = D.request(this.__c, untyped s.__s);
			return new MysqlResultSet(r);
		} catch (e:Dynamic) {
			untyped if (__dollar__typeof(e) == __dollar__tobject && __dollar__typeof(e.msg) == __dollar__tstring)
				e = e.msg;
			untyped __dollar__rethrow(e);
			return null;
		}
	}

	public function close() {
		D.close(__c);
	}

	public function escape(s:String) {
		return new String(D.escape(__c, untyped s.__s));
	}

	public function quote(s:String) {
		return "'" + escape(s) + "'";
	}

	public function addValue(s:StringBuf, v:Dynamic) {
		var t = untyped __dollar__typeof(v);
		if (untyped (t == __dollar__tint || t == __dollar__tnull))
			s.add(v);
		else if (untyped t == __dollar__tbool)
			s.addChar(if (v) "1".code else "0".code);
		else {
			s.addChar("'".code);
			s.add(escape(Std.string(v)));
			s.addChar("'".code);
		}
	}

	public function lastInsertId() {
		return request("SELECT LAST_INSERT_ID()").getIntResult(0);
	}

	public function dbName() {
		return "MySQL";
	}

	public function startTransaction() {
		request("START TRANSACTION");
	}

	public function commit() {
		request("COMMIT");
	}

	public function rollback() {
		request("ROLLBACK");
	}

	private static var __use_date = Date;
}

@:coreApi class Mysql {
	public static function connect(params:{
		host:String,
		?port:Int,
		user:String,
		pass:String,
		?socket:String,
		?database:String
	}):sys.db.Connection {
		var o = untyped {
			host: params.host.__s,
			port: if (params.port == null) 3306 else params.port,
			user: params.user.__s,
			pass: params.pass.__s,
			socket: if (params.socket == null) null else params.socket.__s
		};
		var c = D.connect(o);
		if (params.database != null) {
			try {
				D.select_db(c, untyped params.database.__s);
			} catch (e:Dynamic) {
				D.close(c);
				neko.Lib.rethrow(e);
			}
		}
		return new MysqlConnection(c);
	}
}