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/*Copyright (c) 2020 Jason Zissman
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

(() => {
    ((root, factory) => {
        if (typeof module !== 'undefined' && module.exports) {
            // CommonJS
            return module.exports = factory();
        } else if (typeof define === 'function' && define.amd) {
            // AMD
            define([], () => {
                return (root.TimeMe = factory());
            });
        } else {
            // Global Variables
            return root.TimeMe = factory();
        }
    })(this, () => {

let TimeMe = {

startStopTimes: {},
            idleTimeoutMs: 30 * 1000,
            currentIdleTimeMs: 0,
            checkIdleStateRateMs: 250,
            isUserCurrentlyOnPage: true,
            isUserCurrentlyIdle: false,
            currentPageName: "default-page-name",
            timeElapsedCallbacks: [],
            userLeftCallbacks: [],
            userReturnCallbacks: [],

trackTimeOnElement: (elementId) => {
                let element = document.getElementById(elementId);
                if (element) {
                    element.addEventListener("mouseover", () => {
                        TimeMe.startTimer(elementId);
                    });
                    element.addEventListener("mousemove", () => {
                        TimeMe.startTimer(elementId);
                    });
                    element.addEventListener("mouseleave", () => {
                        TimeMe.stopTimer(elementId);
                    });
                    element.addEventListener("keypress", () => {
                        TimeMe.startTimer(elementId);
                    });
                    element.addEventListener("focus", () => {
                        TimeMe.startTimer(elementId);
                    });
                }
            },

getTimeOnElementInSeconds: (elementId) => {
                let time = TimeMe.getTimeOnPageInSeconds(elementId);
                if (time) {
                    return time;
                } else {
                    return 0;
                }
            },

// startTime is optional. If provided, must be of type Date(). By providing
            // startTime, you are overriding the internal timing mechanism and manually
            // indicating the start time.
            startTimer: (pageName, startTime) => {
                if (!pageName) {
                    pageName = TimeMe.currentPageName;
                }

if (TimeMe.startStopTimes[pageName] === undefined) {
                    TimeMe.startStopTimes[pageName] = [];
                } else {
                    let arrayOfTimes = TimeMe.startStopTimes[pageName];
                    let latestStartStopEntry = arrayOfTimes[arrayOfTimes.length - 1];
                    if (latestStartStopEntry !== undefined && latestStartStopEntry.stopTime === undefined) {
                        // Can't start new timer until previous finishes.
                        return;
                    }
                }
                TimeMe.startStopTimes[pageName].push({
                    "startTime": startTime || new Date(),
                    "stopTime": undefined
                });
            },

stopAllTimers: () => {
                let pageNames = Object.keys(TimeMe.startStopTimes);
                for (let i = 0; i < pageNames.length; i++) {
                    TimeMe.stopTimer(pageNames[i]);
                }
            },

// stopTime is optional. If provided, must be of type Date(). By providing
            // stopTime, you are overriding the internal timing mechanism and manually
            // indicating the stop time.
            stopTimer: (pageName, stopTime) => {
                if (!pageName) {
                    pageName = TimeMe.currentPageName;
                }
                let arrayOfTimes = TimeMe.startStopTimes[pageName];
                if (arrayOfTimes === undefined || arrayOfTimes.length === 0) {
                    // Can't stop timer before you've started it.
                    return;
                }
                if (arrayOfTimes[arrayOfTimes.length - 1].stopTime === undefined) {
                    arrayOfTimes[arrayOfTimes.length - 1].stopTime = stopTime || new Date();
                }
            },

getTimeOnCurrentPageInSeconds: () => {
                return TimeMe.getTimeOnPageInSeconds(TimeMe.currentPageName);
            },

getTimeOnPageInSeconds: (pageName) => {
                let timeInMs = TimeMe.getTimeOnPageInMilliseconds(pageName);
                if (timeInMs === undefined) {
                    return undefined;
                } else {
                    return timeInMs / 1000;
                }
            },

getTimeOnCurrentPageInMilliseconds: () => {
                return TimeMe.getTimeOnPageInMilliseconds(TimeMe.currentPageName);
            },

getTimeOnPageInMilliseconds: (pageName) => {

let totalTimeOnPage = 0;

let arrayOfTimes = TimeMe.startStopTimes[pageName];
                if (arrayOfTimes === undefined) {
                    // Can't get time on page before you've started the timer.
                    return;
                }

let timeSpentOnPageInSeconds = 0;
                for (let i = 0; i < arrayOfTimes.length; i++) {
                    let startTime = arrayOfTimes[i].startTime;
                    let stopTime = arrayOfTimes[i].stopTime;
                    if (stopTime === undefined) {
                        stopTime = new Date();
                    }
                    let difference = stopTime - startTime;
                    timeSpentOnPageInSeconds += (difference);
                }

totalTimeOnPage = Number(timeSpentOnPageInSeconds);
                return totalTimeOnPage;
            },

getTimeOnAllPagesInSeconds: () => {
                let allTimes = [];
                let pageNames = Object.keys(TimeMe.startStopTimes);
                for (let i = 0; i < pageNames.length; i++) {
                    let pageName = pageNames[i];
                    let timeOnPage = TimeMe.getTimeOnPageInSeconds(pageName);
                    allTimes.push({
                        "pageName": pageName,
                        "timeOnPage": timeOnPage
                    });
                }
                return allTimes;
            },

setIdleDurationInSeconds: (duration) => {
                let durationFloat = parseFloat(duration);
                if (isNaN(durationFloat) === false) {
                    TimeMe.idleTimeoutMs = duration * 1000;
                } else {
                    throw {
                        name: "InvalidDurationException",
                        message: "An invalid duration time (" + duration + ") was provided."
                    };
                }
            },

setCurrentPageName: (pageName) => {
                TimeMe.currentPageName = pageName;
            },

resetRecordedPageTime: (pageName) => {
                delete TimeMe.startStopTimes[pageName];
            },

resetAllRecordedPageTimes: () => {
                let pageNames = Object.keys(TimeMe.startStopTimes);
                for (let i = 0; i < pageNames.length; i++) {
                    TimeMe.resetRecordedPageTime(pageNames[i]);
                }
            },
            userActivityDetected: () => {
                if (TimeMe.isUserCurrentlyIdle) {
                    TimeMe.triggerUserHasReturned();
                }
                TimeMe.resetIdleCountdown();
            },
            resetIdleCountdown: () => {
                TimeMe.isUserCurrentlyIdle = false;
                TimeMe.currentIdleTimeMs = 0;
            },

callWhenUserLeaves: (callback, numberOfTimesToInvoke) => {
                TimeMe.userLeftCallbacks.push({
                    callback: callback,
                    numberOfTimesToInvoke: numberOfTimesToInvoke
                })
            },

callWhenUserReturns: (callback, numberOfTimesToInvoke) => {
                TimeMe.userReturnCallbacks.push({
                    callback: callback,
                    numberOfTimesToInvoke: numberOfTimesToInvoke
                })
            },

triggerUserHasReturned: () => {
                if (!TimeMe.isUserCurrentlyOnPage) {
                    TimeMe.isUserCurrentlyOnPage = true;
                    TimeMe.resetIdleCountdown();
                    for (let i = 0; i < TimeMe.userReturnCallbacks.length; i++) {
                        let userReturnedCallback = TimeMe.userReturnCallbacks[i];
                        let numberTimes = userReturnedCallback.numberOfTimesToInvoke;
                        if (isNaN(numberTimes) || (numberTimes === undefined) || numberTimes > 0) {
                            userReturnedCallback.numberOfTimesToInvoke -= 1;
                            userReturnedCallback.callback();
                        }
                    }
                }
                TimeMe.startTimer();
            },

triggerUserHasLeftPageOrGoneIdle: () => {
                if (TimeMe.isUserCurrentlyOnPage) {
                    TimeMe.isUserCurrentlyOnPage = false;
                    for (let i = 0; i < TimeMe.userLeftCallbacks.length; i++) {
                        let userHasLeftCallback = TimeMe.userLeftCallbacks[i];
                        let numberTimes = userHasLeftCallback.numberOfTimesToInvoke;
                        if (isNaN(numberTimes) || (numberTimes === undefined) || numberTimes > 0) {
                            userHasLeftCallback.numberOfTimesToInvoke -= 1;
                            userHasLeftCallback.callback();
                        }
                    }
                }
                TimeMe.stopAllTimers();
            },

callAfterTimeElapsedInSeconds: (timeInSeconds, callback) => {
                TimeMe.timeElapsedCallbacks.push({
                    timeInSeconds: timeInSeconds,
                    callback: callback,
                    pending: true
                });
            },

checkIdleState: () => {
                for (let i = 0; i < TimeMe.timeElapsedCallbacks.length; i++) {
                    if (TimeMe.timeElapsedCallbacks[i].pending && TimeMe.getTimeOnCurrentPageInSeconds() > TimeMe.timeElapsedCallbacks[i].timeInSeconds) {
                        TimeMe.timeElapsedCallbacks[i].callback();
                        TimeMe.timeElapsedCallbacks[i].pending = false;
                    }
                }
                if (TimeMe.isUserCurrentlyIdle === false && TimeMe.currentIdleTimeMs > TimeMe.idleTimeoutMs) {
                    TimeMe.isUserCurrentlyIdle = true;
                    TimeMe.triggerUserHasLeftPageOrGoneIdle();
                } else {
                    TimeMe.currentIdleTimeMs += TimeMe.checkIdleStateRateMs;
                }
            },

visibilityChangeEventName: undefined,
            hiddenPropName: undefined,

listenForVisibilityEvents: (trackWhenUserLeavesPage, trackWhenUserGoesIdle) => {

if (trackWhenUserLeavesPage) {
                    TimeMe.listenForUserLeavesOrReturnsEvents();
                }

if (trackWhenUserGoesIdle) {
                    TimeMe.listForIdleEvents();
                }

listenForUserLeavesOrReturnsEvents: () => {
                if (typeof document.hidden !== "undefined") {
                    TimeMe.hiddenPropName = "hidden";
                    TimeMe.visibilityChangeEventName = "visibilitychange";
                } else if (typeof document.mozHidden !== "undefined") {
                    TimeMe.hiddenPropName = "mozHidden";
                    TimeMe.visibilityChangeEventName = "mozvisibilitychange";
                } else if (typeof document.msHidden !== "undefined") {
                    TimeMe.hiddenPropName = "msHidden";
                    TimeMe.visibilityChangeEventName = "msvisibilitychange";
                } else if (typeof document.webkitHidden !== "undefined") {
                    TimeMe.hiddenPropName = "webkitHidden";
                    TimeMe.visibilityChangeEventName = "webkitvisibilitychange";
                }

window.addEventListener('blur', () => {
                    TimeMe.triggerUserHasLeftPageOrGoneIdle();
                });

window.addEventListener('focus', () => {
                    TimeMe.triggerUserHasReturned();
                });
            },

listForIdleEvents: () => {
                document.addEventListener("mousemove", () => { TimeMe.userActivityDetected(); });
                document.addEventListener("keyup", () => { TimeMe.userActivityDetected(); });
                document.addEventListener("touchstart", () => { TimeMe.userActivityDetected(); });
                window.addEventListener("scroll", () => { TimeMe.userActivityDetected(); });

setInterval(() => {
                    if (TimeMe.isUserCurrentlyIdle !== true) {
                        TimeMe.checkIdleState();
                    }
                }, TimeMe.checkIdleStateRateMs);
            },

websocket: undefined,

websocketHost: undefined,

setUpWebsocket: (websocketOptions) => {
                if (window.WebSocket && websocketOptions) {
                    let websocketHost = websocketOptions.websocketHost; // "ws://hostname:port"
                    try {
                        TimeMe.websocket = new WebSocket(websocketHost);
                        window.onbeforeunload = () => {
                            TimeMe.sendCurrentTime(websocketOptions.appId);
                        };
                        TimeMe.websocket.onopen = () => {
                            TimeMe.sendInitWsRequest(websocketOptions.appId);
                        }
                        TimeMe.websocket.onerror = (error) => {
                            if (console) {
                                console.log("Error occurred in websocket connection: " + error);
                            }
                        }
                        TimeMe.websocket.onmessage = (event) => {
                            if (console) {
                                console.log(event.data);
                            }
                        }
                    } catch (error) {
                        if (console) {
                            console.error("Failed to connect to websocket host.  Error:" + error);
                        }
                    }
                }
            },

websocketSend: (data) => {
                TimeMe.websocket.send(JSON.stringify(data));
            },

sendCurrentTime: (appId) => {
                let timeSpentOnPage = TimeMe.getTimeOnCurrentPageInMilliseconds();
                let data = {
                    type: "INSERT_TIME",
                    appId: appId,
                    timeOnPageMs: timeSpentOnPage,
                    pageName: TimeMe.currentPageName
                };
                TimeMe.websocketSend(data);
            },
            sendInitWsRequest: (appId) => {
                let data = {
                    type: "INIT",
                    appId: appId
                };
                TimeMe.websocketSend(data);
            },

initialize: (options) => {

let idleTimeoutInSeconds = TimeMe.idleTimeoutMs || 30;
                let currentPageName = TimeMe.currentPageName || "default-page-name";
                let websocketOptions = undefined;
                let initialStartTime = undefined;
                let trackWhenUserLeavesPage = true;
                let trackWhenUserGoesIdle = true;

if (options) {
                    idleTimeoutInSeconds = options.idleTimeoutInSeconds || idleTimeoutInSeconds;
                    currentPageName = options.currentPageName || currentPageName;
                    websocketOptions = options.websocketOptions;
                    initialStartTime = options.initialStartTime;

if (options.trackWhenUserLeavesPage === false) {
                        trackWhenUserLeavesPage = false;
                    }
                    if (options.trackWhenUserGoesIdle === false) {
                        trackWhenUserGoesIdle = false;
                    }
                }

TimeMe.setIdleDurationInSeconds(idleTimeoutInSeconds)
                TimeMe.setCurrentPageName(currentPageName)
                TimeMe.setUpWebsocket(websocketOptions)
                TimeMe.listenForVisibilityEvents(trackWhenUserLeavesPage, trackWhenUserGoesIdle);
                TimeMe.startTimer(undefined, initialStartTime);
            }
        };
        return TimeMe;
    });
}).call(this);

// Initialize library and start tracking time
TimeMe.initialize({
    idleTimeoutInSeconds: 30 // seconds
});

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