diff --git a/index.js b/index.js
new file mode 100644
index 0000000..eb4e0d1
--- /dev/null
+++ b/index.js
@@ -0,0 +1,102 @@
+const bookingURL = '/SouthWarkPark/Booking/Book';
+const sessionURL = '/v0/VenueBooking/SouthwarkPark/GetVenueSessions';
+const bookingParams = ['ResourceID', 'SessionID', 'Date', 'startTime', 'endTime'];
+const sessionParams = ['startDate', 'endDate'];
+const courtPreference = [3, 1, 4, 2];
+const defaultFilters = {
+    is_available: true,
+    is_full_hour: true
+}
+const latestFilters = {
+    ...defaultFilters,
+    is_late_evening: true
+}
+
+init()
+
+async function init () {
+    const res = await getSessions(7, latestFilters);
+    const json = await res.json();
+    const sessions = await json.sort(byCourtPreference);
+
+    for (const session of sessions) {
+        try {
+            bookSession(session);
+            break;
+        } catch (e) {
+            console.warn(e);
+        }
+    }
+}
+
+function byCourtPreference (a, b) {
+    return courtPreference.indexOf(a.courtNumber) - courtPreference.indexOf(b.courtNumber);
+}
+
+async function getSessions(startOffset = 0, filters = defaultFilters){
+    const today = new Date();
+    const maxPeriod = today.getHours() >= 20 ? 7 : 6;
+    const startDate = dateByOffset(today, startOffset).toISOString().slice(0, 10);
+    const endDate = dateByOffset(today, maxPeriod).toISOString().slice(0, 10);
+    
+    const res = await fetchSessionsRaw(startDate, endDate);
+    const json = await res.json();
+    const processedData = processRawSessionData(json);
+
+    return filterSessions(processedData, filters);
+}
+
+function filterSessions(sessions, opts){
+    return sessions.filter(item => (
+        Object
+            .entries(opts)
+            .every(([key, val]) => item[key] == val)
+    ))
+}
+
+function processRawSessionData(data){
+    return data.Resources
+        .flatMap(court => court.Days
+        .flatMap(day => day.Sessions
+        .map(session => {
+            return {
+                is_available: !!session.Capacity, 
+                is_full_hour: session.EndTime - session.StartTime >= 60,
+                is_late_evening: session.StartTime >= 1140,
+                startTime: session.StartTime,
+                endTime: session.EndTime,
+                SessionID: session.ID,
+                ResourceID: court.ID,
+                courtNumber: court.Number,
+                Date: day.Date.slice(0, 10),
+                originalResource: session
+            }
+    })))
+}
+
+function fetchSessionsRaw(startDate, endDate){
+    const query = new URLSearchParams({ startDate, endDate }).toString();
+    return fetch(`${ sessionURL }?${ query }`);
+}
+
+function bookSession(params){
+    const validatedOpts = reduceObject(params, bookingParams);
+    const query = new URLSearchParams(validatedOpts).toString();
+    return fetch(`${ bookingURL }?${ query }`);
+}
+
+/**
+ * Helpers
+ */
+
+function dateByOffset(date, offset){
+    let newDate = new Date(date + offset);
+    newDate.setDate(date.getDate() + offset);
+    return newDate;
+}
+
+function reduceObject(obj, validKeys){
+    return Object.fromEntries(
+        Object.entries(obj).filter(([key,]) => validKeys.includes(key))
+    )
+}
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