add poc for firestore

src/itemService.js

@@ -0,0 +1,66 @@
+(() => {
+	window.itemService = {
+		async getItem(id) {
+			var db = await window.db.getDb();
+			return db.doc(`items/${id}`).get().then(doc => {
+				return doc.data();
+			});
+		},
+
+		async getAllItems() {
+			var db = await window.db.getDb();
+
+			return db
+				.doc(`users/${window.user.uid}`)
+				.get()
+				.then(doc => {
+					return doc.data().items;
+				})
+				.then(async itemIds => {
+					console.log('itemids', itemIds);
+					var items = [];
+					for (var id in itemIds) {
+						var item = await this.getItem(id);
+						items.push(item);
+					}
+					return items;
+				});
+		},
+
+		async setUser() {
+			var db = await window.db.getDb();
+			return db.doc(`users/${window.user.uid}`).set({
+				items: {}
+			});
+		},
+
+		async setItem(id, item) {
+			var db = await window.db.getDb();
+			console.log(`Starting to save item ${id}`);
+			return db
+				.collection('items')
+				.doc(id)
+				.set(item, {
+					merge: true
+				})
+				.then(arg => {
+					console.log('Document written', arg);
+				})
+				.catch(error => console.log(error));
+		},
+
+		async setItemForUser(itemId) {
+			var db = await window.db.getDb();
+			return db
+				.collection('users')
+				.doc(window.user.uid)
+				.update({
+					[`items.${itemId}`]: true
+				})
+				.then(arg => {
+					console.log(`Item ${itemId} set for user`, arg);
+				})
+				.catch(error => console.log(error));
+		}
+	};
+})();