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/* global chrome */
const gapi_base = 'https://www.googleapis.com/calendar/v3';
const GApiError = {
invalidSyncToken: 1,
otherError: 2,
};
function to_params(dict) {
return Object.entries(dict).map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`).join('&');
}
function getAuthToken() {
return new Promise(resolver =>
chrome.identity.getAuthToken(
{interactive: true}, token => resolver(token)));
}
function getCalendars(token) {
return fetch(`${gapi_base}/users/me/calendarList?${to_params({access_token: token})}`,
{ method: 'GET', async: true })
.then(response => response.json())
.then(data => data.items);
}
function getColors(token) {
return fetch(`${gapi_base}/colors?${to_params({access_token: token})}`,
{ method: 'GET', async: true })
.then(response => response.json());
}
function getEvent(calId, eventId, token) {
return fetch(`${gapi_base}/calendars/${calId}/events/${eventId}?${to_params({access_token: token})}`,
{ method: 'GET', async: true })
.then(response => response.json());
}
function getEvents(calId, token, syncToken, resultsPerRequest=100) {
let results = [];
const singleFetch = (pageToken, syncToken) => fetch(`${gapi_base}/calendars/${calId}/events?${to_params({
access_token: token,
pageToken,
syncToken,
maxResults: resultsPerRequest
})}`, { method: 'GET', async: true })
.then(response => {
if (response.status === 200)
return response.json();
else if (response.status == 410)
throw GApiError.invalidSyncToken;
else throw GApiError.otherErrors;
})
.then(data => {
results.push(...data.items);
if (data.nextPageToken) {
return singleFetch(data.nextPageToken, '');
} else {
return ({
nextSyncToken: data.nextSyncToken,
results
});
}
})
return singleFetch('', syncToken);
}
class GCalendar {
constructor(calId, name) {
this.calId = calId;
this.name = name;
this.token = getAuthToken();
this.syncToken = '';
this.cache = {};
}
static dateToCacheKey(date) {
return Math.floor(date / 8.64e7);
}
getSlot(k) {
if (!this.cache[k])
this.cache[k] = {};
return this.cache[k];
}
static slotStartDate(k) { return new Date(k * 8.64e7); }
static slotEndDate(k) { return new Date((k + 1) * 8.64e7); }
addEvent(e) {
let ks = GCalendar.dateToCacheKey(e.start);
let ke = GCalendar.dateToCacheKey(new Date(e.end.getTime() - 1));
if (ks === ke)
this.getSlot(ks)[e.id] = {
start: e.start,
end: e.end,
id: e.id,
summary: e.summary};
else
{
this.getSlot(ks)[e.id] = {
start: e.start,
end: GCalendar.slotEndDate(ks),
id: e.id,
summary: e.summary};
this.getSlot(ke)[e.id] = {
start: GCalendar.slotStartDate(ke),
end: e.end,
id: e.id,
summary: e.summary};
for (let k = ks + 1; k < ke; k++)
this.getSlot(k)[e.id] = {
start: GCalendar.slotStartDate(k),
end: GCalendar.slotEndDate(k),
id: e.id,
summary: e.summary};
}
}
removeEvent(e) {
let ks = GCalendar.dateToCacheKey(e.start);
let ke = GCalendar.dateToCacheKey(new Date(e.end.getTime() - 1));
for (let k = ks; k <= ke; k++)
delete this.getSlot(k)[e.id];
}
getSlotEvents(k, start, end) {
let s = this.getSlot(k);
let results = [];
for (let id in s) {
if (!(s[id].start >= end || s[id].end <= start))
{
results.push({
id,
start: s[id].start < start ? start: s[id].start,
end: s[id].end > end ? end: s[id].end,
summary: s[id].summary
});
}
}
return results;
}
getCachedEvents(start, end) {
let ks = GCalendar.dateToCacheKey(start);
let ke = GCalendar.dateToCacheKey(new Date(end.getTime() - 1));
let results = this.getSlotEvents(ks, start, end);
for (let k = ks + 1; k < ke; k++)
{
let s = this.getSlot(k);
for (let id in s)
results.push(s[id]);
}
if (ke > ks)
results.push(...this.getSlotEvents(ke, start, end));
return results;
}
sync() {
return this.token.then(token => getEvents(this.calId, token, this.syncToken).then(r => {
this.syncToken = r.nextSyncToken;
let pm_results = r.results.map(e => e.start ? Promise.resolve(e) : getEvent(this.calId, e.id, token));
return Promise.all(pm_results).then(results => results.forEach(e => {
e.start = new Date(e.start.dateTime);
e.end = new Date(e.end.dateTime);
if (e.status === 'confirmed')
this.addEvent(e);
else if (e.status === 'cancelled')
this.removeEvent(e);
}));
})).catch(e => {
if (e == GApiError.invalidSyncToken) {
this.syncToken = '';
this.sync();
} else throw e;
});
}
getEvents(start, end) {
return this.sync().then(() => this.getCachedEvents(start, end));
}
}
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