Implement interface/config based infrastructure

Fixes #2

1 files changed, 46 insertions, 0 deletions

diff --git a/src/sinks/IcalSink.ts b/src/sinks/IcalSink.ts
new file mode 100644
index 0000000..efb94ac
--- /dev/null
+++ b/src/sinks/IcalSink.ts
@@ -0,0 +1,46 @@
+import {createHash} from 'crypto';
+import {writeFile} from 'fs';
+
+import * as ical from 'ical-generator';
+
+import {ISink} from './ISink';
+import {IEvent} from '../core/IEvent';
+
+
+const sha256 = (x) => createHash('sha256').update(x, 'utf8').digest('hex');
+
+
+// ref. https://www.npmjs.com/package/ical-generator
+export class IcalSink implements ISink {
+    private _cal = ical();
+    private _targetFile: string;
+
+    constructor(targetFile: string) {
+        this._targetFile = targetFile;
+    }
+
+    createEvent(event: IEvent): Promise<void> {
+        // TODO better duplicate detection and resolve conflicts lol
+        const eventId = sha256(JSON.stringify(event)).substr(0, 16);
+
+        const icalEvent = this._cal.createEvent({
+            uid: eventId,
+            start: event.start.toISOString(),
+            end: event.end.toISOString(),
+            timestamp: new Date(),
+            summary: event.summary,
+            description: event.description,
+        });
+
+        return Promise.resolve();
+    }
+
+    commit(): Promise<void> {
+        return new Promise<void>((resolve, reject) => {
+            writeFile(this._targetFile, this._cal.toString(), err => {
+                if (err) return reject(err);
+                resolve();
+            });
+        });
+    }
+}