function DBService() {
	this.path = this.getPath();
	this.directoryName = this.getDirectoryName(this.path);
	this.webPath = this.getWebPath(this.directoryName);

	this.maestroID = 0;
	this.playerID = 0;
	this.appName = "";
	this.dateTime = null;
}

DBService.prototype.getPath = function() {
	return window.location.pathname;
}

DBService.prototype.getDirectoryName = function(path) {
	var pathAndFileNames = path.split("/");
	return pathAndFileNames[pathAndFileNames.length - 2];
}

DBService.prototype.getWebPath = function(directoryName) {
	if(directoryName === "test")	// mouse_typing/test/
		return "../src/web/";
	else	// mousetyping/src/web/client/
		return "../";
}


DBService.prototype.setMaestroID = function(maestroID) {
	this.maestroID = maestroID;
}

DBService.prototype.setPlayerID = function(playerID) {
	this.playerID = playerID;
}

DBService.prototype.setAppName = function(appName) {
	this.appName = appName;
}

DBService.prototype.setDateTime = function(date, time) {
	this.dateTime = date + time;
}

DBService.prototype.resetDateTime = function() {
	this.dateTime = null;
}



DBService.prototype.makeXhr = function(filepath, onreadystatechange) {
	var xhr = new XMLHttpRequest();
	xhr.open("POST", this.webPath + filepath, true);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.onreadystatechange = onreadystatechange;
	return xhr;
}

// tdd setup
DBService.prototype.tddSetup = function(command, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/db/tdd_setup.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send("command=" + command);
}

DBService.prototype.tddRun = function(command, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/db/tdd_run.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send("command=" + command);
}

// writing
DBService.prototype.requestWritingPlayerList = function(onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/writing/player_list.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send("maestroID=" + this.maestroID + "&playerID=" + this.playerID);
}

DBService.prototype.requestWritingInfo = function(writingID, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/writing/writing_info.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send("writingID=" + writingID);
}

// typing exam
DBService.prototype.addPrevHourTypingExamRecord = function(writingID, record, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/record/update_typing_exam_record.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&playerID=" + this.playerID
		+ "&writingID=" + writingID
		+ "&record=" + record
		+ "&isPrevHourFlag=true"
	);
}

DBService.prototype.updateTypingExamRecord = function(writingID, record, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/record/update_typing_exam_record.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&playerID=" + this.playerID
		+ "&writingID=" + writingID
		+ "&record=" + record
	);
}

DBService.prototype.getTypingExamHighestRecord = function(writingID, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/record/get_typing_exam_highest_record.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&playerID=" + this.playerID
		+ "&writingID=" + writingID
	);
}

DBService.prototype.requestTypingExamPlayerHistory = function(writingID, date, onSucceededListener, onFailedListener) {
	/*
	var historyRecordManager = new HistoryRecordManager();
	this.loadTempPlayerHistory(historyRecordManager);
	if(onSucceededListener !== null)
		onSucceededListener(historyRecordManager);

	return;
	*/

	var xhr = this.makeXhr(
		"php/record/get_typing_exam_history_record.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(this.parseJSONtoHistoryRecord(replyJSON));
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&playerID=" + this.playerID
		+ "&writingID=" + writingID
		+ "&date=" + date
	);
}

DBService.prototype.parseJSONtoHistoryRecord = function(jsonData) {
	var historyRecordManager = new HistoryRecordManager();

	if(typeof jsonData === "undefined")
		return historyRecordManager;

	if(typeof jsonData.history === "undefined")
		return historyRecordManager;

	var count = jsonData.history.length;
	for(var i = 0; i < count; i++) {
		var record = new HistoryRecord(
			jsonData.history[i]["Date"],
			jsonData.history[i]["AppName"],
			jsonData.history[i]["HighScore"]
		);
		historyRecordManager.push(record);
	}

	return historyRecordManager;
}

DBService.prototype.loadTempPlayerHistory = function(historyRecordManager) {
	// historyRecordManager.push(new HistoryRecord("05/14", "space_invaders", 14460));
	historyRecordManager.push(new HistoryRecord("2019-05-13 00:00:00", "space_invaders", 14460));
	historyRecordManager.push(new HistoryRecord("2019-05-12 00:00:00", "space_invaders", 12860));
	historyRecordManager.push(new HistoryRecord("2019-05-11 00:00:00", "typing_english_basic", 15460));
	historyRecordManager.push(new HistoryRecord("2019-05-10 00:00:00", "typing_korean_basic", 13040));
	historyRecordManager.push(new HistoryRecord("2019-05-09 00:00:00", "space_invaders", 15460));
	historyRecordManager.push(new HistoryRecord("2019-05-08 00:00:00", "typing_english_basic", 14607));
	historyRecordManager.push(new HistoryRecord("2019-05-07 00:00:00", "typing_korean_basic", 13058));
}

DBService.prototype.loadTempRanking = function(rankingRecordManager) {
	rankingRecordManager.push(new RankingRecord(1, 7, "강경모", 4400));
	rankingRecordManager.push(new RankingRecord(2, 2, "강성태", 3400));
	rankingRecordManager.push(new RankingRecord(3, 3, "김기덕", 2400));
	rankingRecordManager.push(new RankingRecord(4, 4, "김남희", 1400));
	rankingRecordManager.push(new RankingRecord(5, 5, "고봉순", 900));
	rankingRecordManager.push(new RankingRecord(6, 6, "파르마", 800));
	rankingRecordManager.push(new RankingRecord(7, 1, "박지상", 700));
	rankingRecordManager.push(new RankingRecord(8, 8, "신현주", 600));
	rankingRecordManager.push(new RankingRecord(9, 9, "꼬봉이", 500));
	rankingRecordManager.push(new RankingRecord(10, 10, "거북이", 400));
	rankingRecordManager.push(new RankingRecord(11, 11, "다람쥐", 300));
	rankingRecordManager.push(new RankingRecord(12, 12, "사시미", 200));
	rankingRecordManager.push(new RankingRecord(13, 13, "태권도", 100));
	rankingRecordManager.push(new RankingRecord(14, 14, "합기도", 40));
	rankingRecordManager.push(new RankingRecord(15, 15, "우습지", 10));
	rankingRecordManager.push(new RankingRecord(16, 16, "하하하", 4));
}


DBService.prototype.requestTypingExamRanking = function(type, writingID, date, time, onSucceededListener, onFailedListener) {
	/*
		var rankingRecordManager = new RankingRecordManager();
		this.loadTempRanking(rankingRecordManager);
		if(listener !== null)
			listener(rankingRecordManager);

		return;
	}
	*/

	var xhr = this.makeXhr(
		this.getRankingRecordUrl(type),
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null && replyJSON.result == "success")
					onSucceededListener(type, this.parseJSONtoRankingRecord(type, replyJSON));
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&writingID=" + writingID
		+ "&date=" + date
		+ "&time=" + time
	);
}

DBService.prototype.getRankingRecordUrl = function(type) {
	var rankingRecordURL = this.webPath + "web/php/record/";

	switch(type) {
		case DBConnectManager.TYPE_MY_RANKING_HOUR:
		case DBConnectManager.TYPE_ALL_RANKING_HOUR:
		rankingRecordURL += "get_typing_exam_ranking_record_hour.php";
		break;

		case DBConnectManager.TYPE_MY_RANKING_DAY:
		case DBConnectManager.TYPE_ALL_RANKING_DAY:
		rankingRecordURL += "get_typing_exam_ranking_record_day.php";
		break;

		case DBConnectManager.TYPE_MY_RANKING_MONTH:
		case DBConnectManager.TYPE_ALL_RANKING_MONTH:
		rankingRecordURL += "get_typing_exam_ranking_record_month.php";
		break;
	}

	return rankingRecordURL;
}

DBService.prototype.parseJSONtoRankingRecord = function(type, jsonData) {
	var rankingRecordManager = new RankingRecordManager();

	if(typeof jsonData === "undefined")
		return rankingRecordManager;

	var replyJSON = null;
	switch(type) {
		case DBConnectManager.TYPE_MY_RANKING_HOUR:
		case DBConnectManager.TYPE_ALL_RANKING_HOUR:
		replyJSON = jsonData.rankingHour;
		break;

		case DBConnectManager.TYPE_MY_RANKING_DAY:
		case DBConnectManager.TYPE_ALL_RANKING_DAY:
		replyJSON = jsonData.rankingDay;
		break;

		case DBConnectManager.TYPE_MY_RANKING_MONTH:
		case DBConnectManager.TYPE_ALL_RANKING_MONTH:
		replyJSON = jsonData.rankingMonth;
		break;
	}

	if(replyJSON === null)
		return rankingRecordManager;

	var count = replyJSON.length;
	for(var i = 0; i < count; i++) {
		var record = new RankingRecord(
			i + 1,
			replyJSON[i]["PlayerID"],
			replyJSON[i]["Name"],
			replyJSON[i]["HighScore"]
		);
		rankingRecordManager.push(record);
	}

	return rankingRecordManager;
}



// menu
DBService.prototype.requestMainMenuAppData = function(appGroup, language, onSucceededListener, onFailedListener) {
	var xhr = this.makeXhr(
		"php/menu/menu_list.php",
		(function() {	// onreadystatechange
			if(xhr.readyState == 4 && xhr.status == 200) {
				var replyJSON = JSON.parse(xhr.responseText);

				if(replyJSON != null)
					onSucceededListener(replyJSON);
				else
					onFailedListener(replyJSON);
			}
		}).bind(this)
	);
	xhr.send(
		"maestroID=" + this.maestroID
		+ "&playerID=" + this.playerID
		+ "&appGroup=" + appGroup
		+ "&language=" + language
	);
}