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Calculate available time windows
// Designed for Azure functions
module.exports = function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
const scheduledEvents = [];
//Add all scheduled events into an array
req.body.forEach(function (calendar) {
calendar.items.forEach(function (items) {
scheduledEvents.push({
start: new Date(items['start']).toLocaleTimeString('en-US', { hour12: false }),
end: new Date(items['end']).toLocaleTimeString('en-US', { hour12: false })
});
context.log(items['start']);
context.log(new Date(items['start']).getUTCHours());
})
});
// Sort all events chronologically
scheduledEvents.sort(compare);
const schedule = findSlotInDay(scheduledEvents);
// Find first slot
context.log(JSON.stringify(schedule));
context.res = {
body: {
availableSlots: schedule.length,
availableTime: schedule
}
};
context.done();
};
// Data comparison function
function compare(a, b) {
if (a['start'] < b['start']) {
return -1;
}
if (a['start'] > b['start']) {
return 1;
}
return 0;
}
// Courtesy of StackOverflow
// https://stackoverflow.com/questions/19277348/how-to-calculate-free-available-time-based-on-array-values
function findSlotInDay(scheduledEvents) {
const schedule = [];
let start = '08:00:00';
let end = '17:00:00';
const finalEnd = '17:00:00'
for(let i = 0, l = scheduledEvents.length; i < l; i++) {
end = subtractMinute(scheduledEvents[i].start);
if (i)
start = addMinute(scheduledEvents[i-1].end);
if ((end && !i) || (end && i && scheduledEvents[i-1].end < scheduledEvents[i].start))
schedule.push({start: start, end: end});
if (i+1 === l) {
start = addMinute(scheduledEvents[i].end);
if (start) {
schedule.push({start: start, end: finalEnd});
}
}
}
return schedule;
}
function subtractMinute(time) {
let h = + time.substr(0, 2);
let m = + time.substr(3, 2);
if (m > 0) {
m -= 1;
} else {
if (h > 0) {
h -= 1;
} else {
return false;
}
m = 59;
}
if (h < 10)
h = '0' + h;
if (m < 10)
m = '0' + m;
return h + ':' + m + ':00';
}
function addMinute(time) {
let h = + time.substr(0, 2);
let m = + time.substr(3, 2);
if (m < 59) {
m += 1;
} else {
if (h < 22) {
h += 1;
} else {
return false;
}
m = 0;
}
if (h < 10)
h = '0' + h;
if (m < 10)
m = '0' + m;
return h + ':' + m + ':00';
}
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