//  hiFiCalendarServer.js
//
//  Created by Mark Brosche on 4/3/2019
//  Copyright 2019 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html


(function() {

    var FIVE_MINUTES_MS = 300000;

    var that;
    var intervalSchedule = false;

    this.remotelyCallable = [
        "enteredMeetingZone",
        "leftMeetingZone",
        "updateSignColor",
        "addEvent"
    ];


    this.preload = function(entityID) {
        that = this;
        that.entityID = entityID;
        that.entityProperties = Entities.getEntityProperties(that.entityID, ['id', 'name', 'type', 'parentID']);
        that.room = {};
        if (that.entityProperties.name.indexOf("_SCHEDULE") === -1 && 
            that.entityProperties.name.indexOf("_OCCUPANTS") === -1 && 
            that.entityProperties.type === "Text") {
            that.room = {
                "id": that.entityProperties.id, 
                "name": that.entityProperties.name,
                "eventList": [],
                "scheduleEntityID": that.entityProperties.parentID
            };
        } else {
            that.room = {
                "id": that.entityProperties.id, 
                "occupants": []
            }
            return;
        }
        intervalSchedule = Script.setInterval(function(){
            Messages.sendMessage("HiFi.GoogleCalendar", JSON.stringify({
                type: "schedule request"
            }));   
        }, FIVE_MINUTES_MS);
    };


    this.addEvent = function(id, params) {
        if (id === that.entityID) {
            if (!params) {
                startTime = undefined;
                endTime = undefined;
                Entities.editEntity(that.room.scheduleEntityID, {text: "No events scheduled for this room"});
                return;
            } else {
                var startTime = that.googleDateToUTCDate(params[1]);
                var endTime = that.googleDateToUTCDate(params[2]);
                var tempEvent = {summary: params[0], start: startTime, end: endTime};
                var index = 0;
                that.room.eventList.forEach(function(event) {
                    if ((new Date().getDate() - startTime.getDate() > 0) || (startTime - event.start === 0 && that.room.eventList.length > 0)) {
                        index = -1;
                        return;
                    } else if (startTime - event.start > 0) {
                        index++;
                    }
                });
                if (index > -1) {
                    that.room.eventList.splice(index, 0, tempEvent);
                }
            }

            var printedSchedule = '';
            if (that.room.eventList[0].start === "Invalid Date") {
                Entities.editEntity(that.room.scheduleEntityID, {text: "No events scheduled for this room"});
            } else {
                that.room.eventList.forEach(function(event) {
                    printedSchedule = printedSchedule + 
                    event.summary + 
                    ': (' + 
                    event.start.toLocaleDateString('en-US', {"timezone": "America/Los_Angeles", "hour12": true}) +
                    '   ' +
                    event.start.toLocaleTimeString('en-US', {"timezone": "America/Los_Angeles", "hour12": true}) + 
                    ' - ' + 
                    event.end.toLocaleTimeString('en-US', {"timezone": "America/Los_Angeles", "hour12": true}) +
                    ') \n\n';                
                });            
                Entities.editEntity(that.room.scheduleEntityID, {text: printedSchedule});
            }
            that.getBusy();
        }
    };


    this.removeEvent = function(event) {
        if (event > -1) {
            that.room.eventList.splice(event, 1)[0];
        }
    };

    
    // Taken from https://stackoverflow.com/a/11318669
    var googleDate = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})\.(\d{3})([+-]\d{2}):(\d{2})$/;
    var MINS_PER_HOUR = 60;
    this.googleDateToUTCDate = function(d) {
        var m = googleDate.exec(d);
        var year = +m[1];
        var month = +m[2];
        var day = +m[3];
        var hour = +m[4];
        var minute = +m[5];
        var second = +m[6];
        var msec = +m[7];
        var tzHour = +m[8];
        var tzMin = +m[9];
        var tzOffset = new Date().getTimezoneOffset() + tzHour * MINS_PER_HOUR + tzMin;
    
        return new Date(year, month - 1, day, hour, minute - tzOffset, second, msec);
    };


    this.getBusy = function() {
        var now = Date.now();
        if (typeof that.room.eventList[0] === "object") {
            console.log(that.room.name, " end: ",now,new Date(that.room.eventList[0].end), now - new Date(that.room.eventList[0].end)," start: ", now - new Date(that.room.eventList[0].start));
            if (now - new Date(that.room.eventList[0].end) > 0 && now - new Date(that.room.eventList[0].start) <= 0) {
                that.updateSignColor(that.room.id, [that.room.name, "RED"]);
            } else {
                that.updateSignColor(that.room.id, [that.room.name, "GREEN"]);
            }
        } else {
            Entities.editEntity(that.room.scheduleEntityID, {text: "No events scheduled for this room"});
            that.updateSignColor(that.room.id, [that.room.name, "GREEN"]);
        }
    };


    this.enteredMeetingZone = function(id, params) {
        if (that.entityID === id) {    
            var displayName = params[0];

            console.log("User with display name " + displayName + " entered the meeting zone for " + that.room.name);

            if (that.room.occupants.indexOf(displayName) === -1) {
                that.room.occupants.push(displayName);
            }

            Entities.editEntity(id, {
                "text": (that.room.occupants).join("\n"), 
                "textColor": [255, 255, 255]
            });
        }
    };  


    this.leftMeetingZone = function(id, params) {
        if (that.entityID === id) {    
            var displayName = params[0];

            console.log("User with display name " + displayName + " left the meeting zone for " + that.room.name);

            var index = that.room.occupants.indexOf(displayName);
            if (index > -1) {
                that.room.occupants.splice(index, 1);
            }

            Entities.editEntity(id, {
                "text": (that.room.occupants).join("\n"), 
                "textColor": [255, 255, 255]
            });
        }
    };  
    
    
    this.updateSignColor = function(id, params) {
        if (that.entityID === id) {    
            if (params[1] === "GREEN") {
                Entities.editEntity(id, {
                    "text": params[0], 
                    "textColor": [0,0,0], 
                    "textAlpha": 1, 
                    "backgroundColor": [125, 255, 125]
                });
            } else {
                Entities.editEntity(id, {
                    "text": params[0], 
                    "textColor": [0,0,0], 
                    "textAlpha": 1, 
                    "backgroundColor": [255, 125, 125]
                });
            }
        }
    };      


    this.unload = function() {
        if (intervalSchedule) {
            Script.clearInterval(intervalSchedule);
            intervalSchedule = false;
        }
    };
});