/* jslint node: true */
'use strict';

var msgDb			= require('./database.js').dbs.message;
var Config			= require('./config.js').config;

var async			= require('async');
var _				= require('lodash');
var assert			= require('assert');

exports.getAvailableMessageAreas			= getAvailableMessageAreas;
exports.getMessageAreaByName				= getMessageAreaByName;
exports.changeMessageArea					= changeMessageArea;
exports.getMessageListForArea				= getMessageListForArea;

function getAvailableMessageAreas() {
	return Config.messages.areas;
}

function getMessageAreaByName(areaName) {
	areaName = areaName.toLowerCase();

	var availAreas	= getAvailableMessageAreas();
	var index		= _.findIndex(availAreas, function pred(an) {
		return an.name == areaName;
	});

	if(index > -1) {
		return availAreas[index];
	}
}

function changeMessageArea(client, areaName, cb) {
	
	async.waterfall(
		[
			function getArea(callback) {
				var area = getMessageAreaByName(areaName);

				if(area) {
					callback(null, area);
				} else {
					callback(new Error('Invalid message area'));
				}
			},
			function validateAccess(area, callback) {
				//	:TODO: validate user has access to |area| -- must belong to group(s) specified
				callback(null, area);
			},
			function changeArea(area, callback) {
				client.user.persistProperty('message_area_name', area.name, function persisted(err) {
					callback(err, area);
				});
			}
		],
		function complete(err, area) {
			if(!err) {
				client.log.info( area, 'Current message area changed');
			} else {
				client.log.warn( { area : area, error : err.message }, 'Could not change message area');
			}

			cb(err);
		}
	);
}

function getMessageListForArea(options, areaName, cb) {
	//
	//	options.client (required)
	//

	assert(_.isObject(options.client));

	/*
		[
			{ 
				messageId, messageUuid, replyToId, toUserName, fromUserName, subject, modTimestamp,
				status(new|old),
				viewCount
			}
		]
	*/

	var msgList = [];

	async.series(
		[
			function fetchMessages(callback) {
				msgDb.each(
					'SELECT message_id, message_uuid, reply_to_message_id, to_user_name, from_user_name, subject, modified_timestamp, view_count '	+
					'FROM message '																													+
					'WHERE area_name=? '																											+
					'ORDER BY message_id;',
					[ areaName.toLowerCase() ],
					function msgRow(err, row) {
						if(!err) {
							msgList.push( { 
								id				: row.message_id,
								uuid			: row.message_uuid,
								replyToId		: row.reply_to_message_id,
								toUsername		: row.to_user_name,
								fromUsername	: row.from_user_name,
								subject			: row.subject,
								timestamp		: row.modified_timestamp,
								viewCount		: row.view_count,
							} );
						}
					},
					callback
				);
			},
			function fetchStatus(callback) {
				callback(null);//	:TODO: fixmeh.
			}
		],
		function complete(err) {
			cb(err, msgList);
		}
	);
}