/**
 * 消息端点。
 *
 * 此控制器处理点对点，组及消息消息。为三类消息提供发送及查询功能。
 */
"use strict";

let express = require('express');
let router = express.Router();

let http = require('http');
let log = require('../util/log.js');
let objectUtil = require("../util/objectUtil.js");
let controllerUtil = require('../util/controllerUtil');

let Patient = new require("../models/patient");
let Doctor = new require('../models/doctor');
let Group = new require('../models/group');
let Search = require('../models/search');

const APIv1 = require('../include/endpoints').APIv1;
const CONTENT_TYPES = require('../include/commons').CONTENT_TYPE;
const GROUP_TYPE = require('../include/commons').GROUP_TYPE;

const MAX_INT = 9007199254740992;
const DEFAULT_PAGE_SIZE = 100;

//--------------------------------------------------------------//
//----------------------------消息发送----------------------------//
//--------------------------------------------------------------//

/**
 * 发送System消息。
 *
 * 请求URL：
 *  /chats/sm
 *
 * 消息格式：
 *  {
 *      to: "Rose",
 *      title: "System Message",
 *      summary: "You have new job",
 *      contentType: "1",
 *      content: "The patient has been followed in the scheduler, please make new follow plan as soon as possible."
 *  }
 *
 * @param message
 */
router.post(APIv1.Chats.SM, function (req, res) {
    // 检查消息体及消息格式是否正确
    let message = req.body;
    if (!objectUtil.isJsonObject(message)) {
        throw {httpStatus: 406, message: 'Problems parsing JSON.'}
    }

    // 字段判断
    let testing = objectUtil.fieldsCheck(message, "to", "title", "summary", "contentType", "content");
    if (!testing.pass) {
        throw {httpStatus: 406, message: testing.message}
    }

    // 消息处理
    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.sendSystemMessage(message);
});

/**
 * 处理Private消息。处理流程分：
 * 1 解析消息，并保存到数据库
 * 2 更新消息统计数据
 * 3 获取目标的状态并构建通知消息，如果用户在线就推送通知消息
 *
 * 请求URL：
 *  /chats/pm
 *
 * 消息格式：
 *  {
 *      from: sand,
 *      to: Rose,
 *      contentType: "1,2,3,4",
 *      content: "Please follow the patient as soon as possible."
 *  }
 *
 * @param message
 */
router.post(APIv1.Chats.PM, function (req, res) {
    // 检查消息体及消息格式是否正确
    let message = req.body;
    if (!objectUtil.isJsonObject(message)) {
        throw {httpStatus: 406, message: 'Problems parsing JSON.'}
    }

    // 字段判断
    let testing = objectUtil.fieldsCheck(message, "from", "to", "contentType", "content");
    if (!testing.pass) {
        throw {httpStatus: 406, message: testing.message};
    }

    // 消息处理，患者与医生分开发送
    Patient.isPatientCode(message.to,
        function () {
            let patient = new Patient();
            controllerUtil.regModelEventHandler(patient, res);

            patient.sendMessage(message);
        }, function () {
            let doctor = new Doctor();
            controllerUtil.regModelEventHandler(doctor, res);

            doctor.sendMessage(message);
        });
});

/**
 * 处理讨论组消息。
 *
 * 请求URL：
 *  /chats/gm
 *
 * 消息格式：
 *  {
 *      from: "sand",                       // 发送者id
 *      at: "Rose",                         // @人
 *      group: "DiscussionGroupId",         // 所在组
 *      groupType: "1 or 2",                // 组类型：行政团队或讨论组
 *      contentType: "1,2,3",               // 内容类型
 *      content: "The patient mess me up"   // 内容
 *  }
 *
 * @param message
 */
router.post(APIv1.Chats.GM, function (req, res) {
    // 检查消息体及消息格式是否正确
    let message = req.body;

    if (!objectUtil.isJsonObject(message)) {
        throw {httpStatus: 406, message: 'Problems parsing JSON.'};
    }

    // 字段判断
    let testing = objectUtil.fieldsCheck(message, 'from', 'at', 'group', 'groupType', 'contentType', 'content');
    if (!testing.pass) {
        throw {httpStatus: 406, message: testing.message}
    }

    // 消息处理
    let group = new Group();
    controllerUtil.regModelEventHandler(group, res);

    group.sendMessage(message);
});

//--------------------------------------------------------------//
//----------------------------消息提取----------------------------//
//--------------------------------------------------------------//

/**
 * 获取参与的聊天列表，包括：点对点，@我，参与的讨论组，系统消息等。
 *
 * 请求URL：
 *  /chats/list?user_id=sand
 */
router.get(APIv1.Chats.List, function (req, res) {
    let userId = req.query.user_id;
    if (userId === null) {
        throw {httpStatus: 406, message: 'Missing fields.'};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getChatList(userId);
});

/**
 * 获取与患者的聊天列表，包括：P2P，参与的讨论组和行政团队。
 *
 * 请求URL：
 *  /chats/list/patient
 */
router.get(APIv1.Chats.ListWithPatient, function (req, res) {
    let userId = req.query.user_id;
    if (userId === null) {
        throw {httpStatus: 406, message: 'Missing fields.'};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getChatsListWithPatient(userId);
});

/**
 * 获取与医生的聊天列表，包括：点对点，参与的讨论组。
 *
 * 请求URL：
 *  /chats/list/doctor
 */
router.get(APIv1.Chats.ListWithDoctor, function (req, res) {
    let userId = req.query.user_id;
    if (userId === null) {
        throw {httpStatus: 406, message: 'Missing fields.'};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getChatListWithDoctor(userId);
});

/**
 * 获取最近聊天对象：包括患者，医生与讨论组。客户端自行根据需要提取患者、医生或讨论组数据。
 *
 * 请求URL：
 *  /chats/recent?user_id=0de7295862dd11e69faffa163e8aee56&days=7
 *
 * 参数：
 *  user_id: 用户ID
 *  target_type: 对象类型，1患者，2医生，3讨论组
 *  days: 最近天数
 */
router.get(APIv1.Chats.Recent, function (req, res) {
    let userId = req.query.user_id;
    let days = req.query.days;
    if (userId === null) {
        throw {httpStatus: 406, message: 'Missing field: user_id'};
    }

    if (days === null) {
        throw {httpStatus: 406, message: 'Missing field: days'};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getRecentChatList(userId);
});

/**
 * 获取私信。倒序排列。
 *
 * 参数：
 *  user_id 必须，医生ID
 *  peer_id 必须，对方医生ID
 *  content_type 必须，消息类型
 *  message_start_id 可选，消息的起始ID，如果为空从最新的一条开始获取
 *  message_end_id 可选，消息的结束ID，如果为空从第一条开始获取
 *  count 可选，消息数量，如果不指定、小于零或大于50，默认为100条。若message_start_id与message_end_id均不为空，则此参数无效，方法是设置为10000条
 *  closed_interval 消息范围是否使用闭区间
 *
 * 请求URL：
 *  /chats/pm?user_id=sand&peer_id=Rose&content_type=2&message_start_id=10000&message_end_id=0&count=20&closed_interval=false
 */
router.get(APIv1.Chats.PM, function (req, res) {
    let userId = req.query.user_id;
    let peerId = req.query.peer_id;
    let contentType = req.query.content_type;
    let msgStartId = !req.query.message_start_id ? MAX_INT : parseInt(req.query.message_start_id);
    let msgEndId = !req.query.message_end_id ? 0 : parseInt(req.query.message_end_id);
    let count = req.query.count === undefined ? DEFAULT_PAGE_SIZE : parseInt(req.query.count);
    let closedInterval = (req.query.closed_interval != false && req.query.closed_interval === "true");

    if (contentType !== undefined && parseInt(contentType) === CONTENT_TYPES.Image) count = DEFAULT_PAGE_SIZE;

    if (req.query.message_start_id && req.query.message_end_id) count = 10000;

    if (!userId) {
        throw {httpStatus: 400, message: "Missing field: user_id."};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getPrivateMessages(userId, peerId, contentType, msgStartId, msgEndId, count, closedInterval);
});

/**
 * 获取未读私信。倒序排列。
 *
 * 参数：
 *  user_id 必须，医生ID
 *  peer_id 必须，对方医生ID
 *
 * 请求URL：
 *  /chats/pm/unread?user_id=sand&peer_id=Rose
 */
router.get(APIv1.Chats.PMUnread, function (req, res) {
    let userId = req.query.user_id;
    let peerId = req.query.peer_id;

    if (userId === undefined) {
        throw {httpStatus: 400, message: "Missing field: user_id."};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getUnreadPrivateMessages(userId, peerId);
});

/**
 * 按时间倒序获取群消息。
 *
 * 参数：
 *  user_id 必须，医生ID
 *  group_id 必须，组ID
 *  message_start_id 可选，消息的起始ID，如果为空从最新的一条开始获取
 *  count 可选，消息数量，如果不指定、小于零或大于50，默认为50条
 *
 * 请求URL：
 *  /chats/gm?user_id=D2016008240002&group_id=494&content_type=2&message_start_id=0&message_end_id=0&count=20
 */
router.get(APIv1.Chats.GM, function (req, res) {
    let groupId = req.query.group_id;
    let memberId = req.query.user_id;
    let contentType = req.query.content_type;
    let msgStartId = !req.query.message_start_id ? MAX_INT : parseInt(req.query.message_start_id);
    let msgEndId = !req.query.message_end_id ? 0 : parseInt(req.query.message_end_id);
    let count = req.query.count === undefined ? DEFAULT_PAGE_SIZE : parseInt(req.query.count);

    if (groupId === undefined) {
        throw {httpStatus: 400, message: "Missing field: group_id."};
    }

    if (contentType !== undefined && parseInt(contentType) === CONTENT_TYPES.Image) count = DEFAULT_PAGE_SIZE;

    if (req.query.message_start_id && req.query.message_end_id) count = 100000;

    let group = new Group();
    controllerUtil.regModelEventHandler(group, res);

    group.getMessages(groupId, memberId, contentType, msgStartId, msgEndId, count);
});

/**
 * 获取未读群消息。
 *
 * 请求URL:
 *  /chats/gm/unread?group_id=discussionGroupId&user_id=sand
 */
router.get(APIv1.Chats.GMUnread, function (req, res) {
    let memberId = req.query.user_id;
    let groupId = req.query.group_id;

    if (memberId === undefined) {
        throw {httpStatus: 400, message: "Missing field: user_id."};
    }

    if (groupId === undefined) {
        throw {httpStatus: 400, message: "Missing field: group_id."};
    }

    let group = new Group();
    controllerUtil.regModelEventHandler(group, res);

    group.getUnreadMessages(groupId, memberId);
});

//--------------------------------------------------------------//
//----------------------------消息统计----------------------------//
//--------------------------------------------------------------//

/**
 * 获取所有群组未读消息总数。
 *
 * 请求URL：
 *  /chats/gm/unread_count?user_id=sand
 *
 * 参数：
 *  user_id：医生ID
 */
router.get(APIv1.Chats.GMUnreadCount, function (req, res) {
    let memberId = req.query.user_id;
    if (memberId === null) {
        throw {httpStatus: 406, message: 'Missing fields.'};
    }

    let group = new Group();
    controllerUtil.regModelEventHandler(group, res);

    group.getUnreadMessageCount(memberId);
});

/**
 * 获取特定群组消息统计情况。
 *
 * /chats/gm/statistic?group_id=GGG&&user_id=sand
 *
 * 参数：
 *  user_id：信息所有者id
 *  group_id：群组id
 */
router.get(APIv1.Chats.GMStats, function (req, res) {
    let memberId = req.query.user_id;
    let groupId = req.query.group_id;
    if (memberId === null || groupId === null) {
        throw {httpStatus: 406, message: 'Miss fields.'};
    }

    let group = new Group();
    controllerUtil.regModelEventHandler(group, res);

    group.getChatSummary(groupId, memberId);
});

/**
 * 获取与某人的私信统计。
 *
 * /chats/pm/statistic?user_id=sand&&peer_id=rose
 *
 * 参数：
 *  user_id：信息所有者id
 *  peer_id：聊天对端id
 */
router.get(APIv1.Chats.PMStats, function (req, res) {
    let userId = req.query.user_id;
    let peerId = req.query.peer_id;
    if (userId == null || peerId == null) {
        throw {httpStatus: 406, message: "Missing fields."};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getChatSummary(userId, peerId);
});

/**
 * 获取所有未读私信总数。
 *
 * /chats/pm/unread_count?user_id=sand
 *
 * 参数：
 * uid：信息所有者id
 */
router.get(APIv1.Chats.PMUnreadCount, function (req, res) {
    let userId = req.query.user_id;

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getUnreadPrivateMessages(userId);
});

/**
 * 所有聊天消息未读数。
 *
 * 请求URL：
 *  /chats/chats/unread_count?user_id=sand
 *
 * 参数：
 *  user_id：信息所有者id
 */
router.get(APIv1.Chats.UnreadMsgCount, function (req, res) {
    let userId = req.query.user_id;
    if (userId === null) {
        throw {httpStatus: 406, message: "Missing fields."};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getAllUnreadMessageCount(userId);
});


/**
 * 搜索患者相关的数据，包括患者信息与相关的私信记录。关键词不支持空格拆分。
 *
 * 请求URL：
 *  /search/patient?user_id=3b723bb8699a11e69f7c005056850d66&user_role=1&keyword=庄
 *
 * 参数：
 *  keywords: 关键词
 */
router.get(APIv1.Chats.SearchAboutPatient, function (req, res) {
    let userId = req.query.user_id;
    let userRole = req.query.user_role;
    let keyword = req.query.keyword;

    if (!userId) throw {httpStatus: 406, message: "Missing fields: user_id."};
    if (!userRole) throw {httpStatus: 406, message: "Missing fields: user_role."};
    if (!keyword) throw {httpStatus: 406, message: "Missing fields: keyword."};

    let search = new Search();
    controllerUtil.regModelEventHandler(search, res);

    search.searchAboutPatient(userId, userRole, keyword);
});

/**
 * 搜索医生相关的数据，包括医生信息与相关的聊天记录，包括私信与群信。
 *
 * 请求URL：
 *  /search/doctor?user_id=5fa5e88f7a4111e69f7c005056850d66&keyword=丘
 *
 * 参数：
 *  keywords: 关键词
 */
router.get(APIv1.Chats.SearchAboutDoctor, function (req, res) {
    let userId = req.query.user_id;
    let keyword = req.query.keyword;

    if (!userId) throw {httpStatus: 406, message: "Missing fields: user_id."};
    if (!keyword) throw {httpStatus: 406, message: "Missing fields: keyword."};

    let search = new Search();
    controllerUtil.regModelEventHandler(search, res);

    search.searchAboutDoctor(userId, keyword);
});

/**
 * 获取单条消息。
 *
 * URL：
 *  /chats/message?id=1234&type=1
 */
router.get(APIv1.Chats.Message, function (req, res) {
    let messageId = req.query.id;
    let messageType = req.query.type;

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.getMessage(messageId, messageType);
});

/**
 * 判断当前会话是否已经结束。
 *
 * 请求URL：
 *  /chats/pm/finished?user_id=sand&peer_id=rose
 */
router.get(APIv1.Chats.PMFinished, function (req, res) {
    let doctorId = req.query.doctor_id;
    let patientId = req.query.patient_id;
    if (!doctorId) {
        throw {httpStatus: 406, message: "Missing field: doctor_id"};
    }

    if (!patientId) {
        throw {httpStatus: 406, message: "Missing field: patient_id"};
    }

    let doctor = new Doctor();
    controllerUtil.regModelEventHandler(doctor, res);

    doctor.isConsultFinished(doctorId, patientId);
});

module.exports = router;