/*
    ***** BEGIN LICENSE BLOCK *****
    
    Copyright © 2014 Center for History and New Media
                     George Mason University, Fairfax, Virginia, USA
                     http://zotero.org
    
    This file is part of Zotero.
    
    Zotero is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    Zotero is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.
    
    You should have received a copy of the GNU Affero General Public License
    along with Zotero.  If not, see <http://www.gnu.org/licenses/>.
    
    ***** END LICENSE BLOCK *****
*/

Zotero.Users = new function () {
	var _userID;
	var _libraryID;
	var _username;
	var _localUserKey;
	var _users = {};
	
	this.init = async function () {
		let sql = "SELECT key, value FROM settings WHERE setting='account'";
		let rows = await Zotero.DB.queryAsync(sql);
		
		let settings = {};
		for (let i=0; i<rows.length; i++) {
			settings[rows[i].key] = rows[i].value;
		}
		
		if (settings.userID) {
			_userID = settings.userID;
			_libraryID = settings.libraryID;
			_username = settings.username;
		}
		// Clear old values when reinitializing for tests
		else {
			_userID = undefined;
			_libraryID = undefined;
			_username = undefined;
		}
		
		if (settings.localUserKey) {
			_localUserKey = settings.localUserKey;
		} else {
			let key = Zotero.randomString(8);
			
			sql = "INSERT INTO settings VALUES ('account', 'localUserKey', ?)";
			await Zotero.DB.queryAsync(sql, key);
			
			_localUserKey = key;
		}
		
		rows = await Zotero.DB.queryAsync("SELECT userID, name FROM users");
		for (let row of rows) {
			_users[row.userID] = row.name;
		}
	};
	
	
	this.getCurrentUserID = function () { return _userID };
	this.setCurrentUserID = async function (val) {
		val = parseInt(val);
		if (!(val > 0)) throw new Error("userID must be a positive integer");
		
		var sql = "REPLACE INTO settings VALUES ('account', 'userID', ?)";
		await Zotero.DB.queryAsync(sql, val);
		_userID = val;
	};
	
	
	this.getCurrentUsername = () => _username;
	this.setCurrentUsername = async function (val) {
		if (!val || typeof val != 'string') throw new Error('username must be a non-empty string');
		
		var sql = "REPLACE INTO settings VALUES ('account', 'username', ?)";
		await Zotero.DB.queryAsync(sql, val);
		_username = val;
	};
	
	
	this.getCurrentName = function () {
		var userID = this.getCurrentUserID();
		return userID ? this.getName(userID) : '';
	};
	this.setCurrentName = async function (name) {
		var userID = this.getCurrentUserID();
		if (!userID) {
			throw new Error("Current user ID must be set before setting name");
		}
		await this.setName(userID, name);
	};
	
	
	this.getLocalUserKey = function () {
		return _localUserKey;
	};
	
	
	this.getName = function (userID) {
		return _users[userID] || '';
	};
	
	
	this.setName = async function (userID, name) {
		if (this.getName(userID) == name) {
			return;
		}
		await Zotero.DB.queryAsync("REPLACE INTO users VALUES (?, ?)", [userID, name]);
		_users[userID] = name;
	}
};
