/**
 * App客户端。
 */
"use strict";

let RedisClient = require('../../repository/redis/redis.client');
let RedisModel = require('./../redis.model');
let AppStatusRepo = require('../../repository/mysql/app.status.repo');
let ModelUtil = require('../../util/model.util');

let log = require("../../util/log.js");
let pusher = require('../push/pusher');
let redisConn = RedisClient.redisClient().connection;

const CONTENT_TYPES = require('../../include/commons').CONTENT_TYPES;
const REDIS_KEYS = require('../../include/commons').REDIS_KEYS;
const PLATFORMS = require('../../include/commons').PLATFORM;

class AppClient extends RedisModel {
    constructor() {
        super();
    }

    /**
     * 更新客户端App状态。
     *
     * @param userId
     * @param appInBg
     * @param handler
     */
    updateAppStatus(userId, appInBg, handler) {
        let self = this;
        let userStatusKey = RedisModel.makeRedisKey(REDIS_KEYS.UserAppStatus, userId);
        redisConn.hgetAsync(userStatusKey, 'app_in_bg').then(function (res) {
            if (res !== null) {
                redisConn.hsetAsync(userStatusKey, 'app_in_bg', appInBg ? 1 : 0).then(function (res) {
                    if (handler) {
                        handler(null, true);
                    } else {
                        ModelUtil.emitOK(self.eventEmitter, {});
                    }
                });
            } else {
                if (handler) {
                    handler(null, true);
                } else {
                    ModelUtil.emitDataNotFound(self.eventEmitter, {"message": "User is offline, unable to update app status."});
                }
            }
        });
    }

    /**
     * 获取用户App端状态。若Redis中找不到，则从MySQL中查找。
     *
     * @param userId
     * @param handler
     */
    static getAppStatus(userId, handler) {
        let userStatusKey = RedisModel.makeRedisKey(REDIS_KEYS.UserAppStatus, userId);
        redisConn.hgetallAsync(userStatusKey)
            .then(function (res) {
                if (res) {
                    handler(null, res);
                } else {
                    AppStatusRepo.findOne(userId, function (err, res) {
                        if (err) throw err;

                        let userStatus = null;
                        if (res.length > 0) {
                            userStatus = {
                                platform: res[0].platform,
                                device_token: res[0].device_token,
                                client_id: res[0].client_id,
                                app_in_bg: res[0].app_in_bg == 1,
                                last_login_time: res[0].last_login_time
                            }
                        }

                        handler(null, userStatus);
                    });
                }
            })
            .catch(function (err) {
                handler(err, null);
            });
    }

    /**
     * 向App端推送消息。指令性消息不推。
     *
     * @param targetId
     * @param message
     * @param sessionType
     */
    static sendNotification(targetId, message, sessionType) {
        if (message.content_type == CONTENT_TYPES.PlainText ||
            message.content_type == CONTENT_TYPES.Image ||
            message.content_type == CONTENT_TYPES.Audio||
            message.content_type == CONTENT_TYPES.Video) {

            AppClient.getAppStatus(targetId, function (err, userStatus) {
                if (err) {
                    ModelUtil.logError("Get user app status failed", err);
                    return;
                }

                if (!userStatus) {
                    log.warn("User's app status is not found, user id: " + targetId + ", maybe user never login yet or logout?");
                    return;
                }

                let tipMessage = CONTENT_TYPES.typeToDescription(parseInt(message.content_type), "您有一条新消息") || message.content;
                let customData = {
                    session_id: '' || message.session_id,
                    session_type: sessionType,
                    topic_id: '' || message.topic_id,
                    from: '' || message.sender_id,
                    data: message.content,
                    business_type: message.business_type || 1
                };

                if (userStatus.platform == PLATFORMS.iOS) {
                    pusher.pushToSingleViaAPN(tipMessage, customData, message.contentType, userStatus.device_token, function (err, res) {
                        if (err) {
                            ModelUtil.logError("Send notification via APN failed", err);
                        } else {
                            log.info("Send notification via APN succeed: ", JSON.stringify(res));
                        }
                    });
                } else if (userStatus.platform == PLATFORMS.Android) {
                    let title = '新消息';
                    pusher.pushToSingleViaAndroid(title, tipMessage, customData, userStatus.client_id, userStatus.app_in_bg, function (err, res) {
                        if (err) {
                            ModelUtil.logError("Send notification via Android failed", err);
                        } else {
                            log.info("Send notification via Android succeed: ", JSON.stringify(res));
                        }
                    });
                }
            });
        }
    }
}

// Expose class
module.exports = AppClient;