basics of timer functionality

src/components/timer.vue

@@ -1,9 +1,17 @@
 <script lang="ts">
 	import axios from 'axios';
+
+	const getAccumulatedSeconds = (newerTime, olderTime) => {
+		return Math.floor((newerTime-olderTime)/1000);
+	}
+
 	export default {
 		data() {
 			return {
-				categories:[]
+				categories:[],
+				running: false,
+				startTime:0,
+				savedPreviousSeconds:0
 			}
 		},
 		methods: {
@@ -15,10 +23,12 @@
 				console.log(this.practice_category_id);
 			},
 			start(event){
-				console.log('starting');
+				this.startTime = Date.now();
+				this.running = true;
 			},
 			stop(event){
-				console.log('stopping');
+				this.running = false;
+				this.savedPreviousSeconds += getAccumulatedSeconds(Date.now(), this.startTime);
 			}
 		},
 		mounted() {
@@ -32,14 +42,14 @@
 <template>
 	<details>
 		<summary><h2>Timer</h2></summary>
-		<button @click="start">Start Timer</button>
-		<button @click="stop">Stop Timer</button>
+		<button :disabled="running" @click="start">Start Timer</button>
+		<button :disabled="!running" @click="stop">Stop Timer</button>
 		<form @submit="submit">
 			<label>Description</label>
 			<input v-model="description" type="text"/>
 
 			<label>Seconds</label>
-			<input v-model="seconds" type="number"/>
+			<input v-model="savedPreviousSeconds" type="number"/>
 
 			<label>Comments</label>
 			<textarea v-model="comments"/>