leave a message functionallity (sheet and fab)

src/lib/Firebase/config.js

@@ -1,59 +1,28 @@
-import { browser } from '$app/environment';
-import { initializeApp, getApps } from 'firebase/app';
+
+// we get all our firebase config from the .env file, not included in the repo, so we don't share our API keys. 
+// then we initialize the app and export the database and storage so we can use them in other files  
+
+import { initializeApp } from 'firebase/app';
 import { getFirestore } from 'firebase/firestore';
 import { getStorage } from 'firebase/storage';
-import { env } from '$env/dynamic/public';
+import {
+  PUBLIC_FIREBASE_API_KEY,
+  PUBLIC_FIREBASE_AUTH_DOMAIN,
+  PUBLIC_FIREBASE_PROJECT_ID,
+  PUBLIC_FIREBASE_STORAGE_BUCKET,
+  PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
+  PUBLIC_FIREBASE_APP_ID
+} from '$env/static/public';
 
-/** Firebase 환경 변수가 모두 설정됐는지 확인 */
-export function isFirebaseConfigured() {
-	return Boolean(
-		env.PUBLIC_FIREBASE_API_KEY &&
-			env.PUBLIC_FIREBASE_AUTH_DOMAIN &&
-			env.PUBLIC_FIREBASE_PROJECT_ID &&
-			env.PUBLIC_FIREBASE_STORAGE_BUCKET &&
-			env.PUBLIC_FIREBASE_MESSAGING_SENDER_ID &&
-			env.PUBLIC_FIREBASE_APP_ID
-	);
-}
-
-function getFirebaseConfig() {
-	return {
-		apiKey: env.PUBLIC_FIREBASE_API_KEY,
-		authDomain: env.PUBLIC_FIREBASE_AUTH_DOMAIN,
-		projectId: env.PUBLIC_FIREBASE_PROJECT_ID,
-		storageBucket: env.PUBLIC_FIREBASE_STORAGE_BUCKET,
-		messagingSenderId: env.PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
-		appId: env.PUBLIC_FIREBASE_APP_ID
+const firebaseConfig = {
+  apiKey: PUBLIC_FIREBASE_API_KEY,
+  authDomain: PUBLIC_FIREBASE_AUTH_DOMAIN,
+  projectId: PUBLIC_FIREBASE_PROJECT_ID,
+  storageBucket: PUBLIC_FIREBASE_STORAGE_BUCKET,
+  messagingSenderId: PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
+  appId: PUBLIC_FIREBASE_APP_ID
 };
-}
 
-let app;
-let db;
-let storage;
-
-/** Firebase 앱을 지연 초기화하고 Firestore 인스턴스를 반환 */
-export function getDb() {
-	if (!browser) {
-		throw new Error('Firestore는 브라우저에서만 사용할 수 있습니다.');
-	}
-
-	if (!isFirebaseConfigured()) {
-		throw new Error(
-			'Firebase 환경 변수가 설정되지 않았습니다. .env.example을 참고해 .env 파일을 만드세요.'
-		);
-	}
-
-	if (!app) {
-		app = getApps().length ? getApps()[0] : initializeApp(getFirebaseConfig());
-		db = getFirestore(app);
-		storage = getStorage(app);
-	}
-
-	return db;
-}
-
-/** Firebase Storage 인스턴스 반환 */
-export function getStorageInstance() {
-	getDb();
-	return storage;
-}
+const app = initializeApp(firebaseConfig);
+export const db = getFirestore(app);
+export const storage = getStorage(app);

src/lib/Firebase/messages.js

@@ -1,17 +1,11 @@
-import { collection, query, where, getDocs } from 'firebase/firestore';
-import { getDb, isFirebaseConfigured } from './config.js';
-import { getQueryPrefix } from '$lib/utils/geohash.js';
+import { collection, query, where, getDocs, addDoc } from 'firebase/firestore'; // tools for building and running db queries
+import { db } from './config'; // database connection
+import { getQueryPrefix } from '$lib/utils/geohash'; // convert coordinates into geohash string 
+import { doc, updateDoc, increment, serverTimestamp } from 'firebase/firestore';
+import ngeohash from 'ngeohash';
 
 export async function getNearbyMessages(lat, lng) {
-	if (!isFirebaseConfigured()) {
-		console.warn(
-			'Firebase가 설정되지 않아 메시지를 불러오지 못했습니다. 프로젝트 루트에 .env 파일을 추가하세요.'
-		);
-		return [];
-	}
-
     const prefix = getQueryPrefix(lat, lng);
-	const db = getDb();
 
     const q = query(
         collection(db, 'messages'),
@@ -20,5 +14,38 @@ export async function getNearbyMessages(lat, lng) {
     );
 
     const snapshot = await getDocs(q);
-	return snapshot.docs.map((doc) => ({ id: doc.id, ...doc.data() }));
+    return snapshot.docs.map(doc => ({ id: doc.id, ...doc.data() }));
+}
+
+export async function echoMessage(messageId) {
+    const ref = doc(db, 'messages', messageId);
+    await updateDoc(ref, {
+        echoCount: increment(1),
+        lastEchoAt: serverTimestamp()
+    });
+}
+
+export async function addMessage(lat, lng, text, imageUrl = ''){
+    const geohash = ngeohash.encode(lat, lng, 6);
+
+    await addDoc(collection(db, 'messages'), {
+        text, 
+        imageUrl, 
+        lat, 
+        lng,
+        geohash, 
+        createdAt: serverTimestamp(),
+        lastEchoAt: serverTimestamp(),
+        echoCount: 0,
+        sessionId: getSessionId()
+    });
+}
+
+function getSessionId() {
+    let id = localStorage.getItem('overheard_session');
+    if (!id) {
+        id = crypto.randomUUID(); // created random useer id 
+        localStorage.setItem('oveheard_session', id);
+    }
+    return id;
 }

src/lib/components/ARView.svelte

@@ -1,165 +0,0 @@
-<script>
-  import { onMount, onDestroy } from 'svelte';
-  import { arStore } from '$lib/stores/arStore.js';
-
-  let { lat, lng } = $props();
-
-  let videoElement;
-  let cameraStream = null;
-  let cameraError = '';
-
-  async function startCamera() {
-    try {
-      cameraStream = await navigator.mediaDevices.getUserMedia({
-        video: {
-          facingMode: { ideal: 'environment' }
-        },
-        audio: false
-      });
-
-      if (videoElement) {
-        videoElement.srcObject = cameraStream;
-        await videoElement.play();
-      }
-    } catch (error) {
-      console.error('Camera error:', error);
-      cameraError = 'Camera could not be started.';
-    }
-  }
-
-  function stopCamera() {
-    if (cameraStream) {
-      cameraStream.getTracks().forEach((track) => track.stop());
-      cameraStream = null;
-    }
-  }
-
-  function exitARMode() {
-    stopCamera();
-
-    arStore.update((state) => ({
-      ...state,
-      isARMode: false,
-      selectedScreenPoint: null,
-      composing: false,
-      focusedMessage: null
-    }));
-  }
-
-  onMount(() => {
-    startCamera();
-  });
-
-  onDestroy(() => {
-    stopCamera();
-  });
-</script>
-
-<div class="ar-view">
-  <video
-    bind:this={videoElement}
-    class="camera-video"
-    autoplay
-    playsinline
-    muted
-  ></video>
-
-  <div class="ar-overlay">
-    <button class="back-button" onclick={exitARMode}>
-      Back
-    </button>
-
-    {#if cameraError}
-      <div class="camera-error">
-        <p>{cameraError}</p>
-        <p class="small">Please check camera permission in your browser.</p>
-      </div>
-    {:else}
-      <div class="ar-status">
-        <p>AR Mode</p>
-        <p class="small">Move your camera slowly.</p>
-      </div>
-    {/if}
-  </div>
-</div>
-
-<style>
-  .ar-view {
-    position: fixed;
-    inset: 0;
-    background: #000;
-    color: white;
-    z-index: 1000;
-    overflow: hidden;
-  }
-
-  .camera-video {
-    position: absolute;
-    inset: 0;
-    width: 100%;
-    height: 100%;
-    object-fit: cover;
-    background: #000;
-  }
-
-  .ar-overlay {
-    position: absolute;
-    inset: 0;
-    z-index: 2;
-    pointer-events: none;
-  }
-
-  .back-button {
-    position: absolute;
-    top: 20px;
-    left: 16px;
-    z-index: 10;
-    padding: 10px 14px;
-    border: none;
-    border-radius: 999px;
-    background: rgba(255, 255, 255, 0.9);
-    color: #111;
-    font-weight: 600;
-    pointer-events: auto;
-  }
-
-  .ar-status {
-    position: absolute;
-    left: 50%;
-    bottom: 36px;
-    transform: translateX(-50%);
-    padding: 12px 18px;
-    border-radius: 999px;
-    background: rgba(0, 0, 0, 0.45);
-    backdrop-filter: blur(8px);
-    text-align: center;
-  }
-
-  .ar-status p {
-    margin: 0;
-    font-size: 14px;
-  }
-
-  .small {
-    margin-top: 4px;
-    font-size: 12px;
-    opacity: 0.75;
-  }
-
-  .camera-error {
-    position: absolute;
-    left: 20px;
-    right: 20px;
-    top: 50%;
-    transform: translateY(-50%);
-    padding: 20px;
-    border-radius: 18px;
-    background: rgba(255, 255, 255, 0.94);
-    color: #111;
-    text-align: center;
-  }
-
-  .camera-error p {
-    margin: 0;
-  }
-</style>

src/lib/components/BottomSheet.svelte

@@ -1,7 +1,20 @@
 <script>
     import { mapStore } from '$lib/stores/mapStore.js';
+    import { getDecayInfo } from '$lib/utils/time.js'
+    import { echoMessage } from '$lib/firebase/messages.js'
 
     let { message } = $props();
+
+    let decay = $derived(
+        message ? getDecayInfo(message.createdAt, message.lastEchoAt) : null
+    );
+
+    let echoed = $state(false);
+
+    async function handleEcho() {
+        await echoMessage(message.id);
+        echoed = true;
+    }
 </script>
 
 <!-- if message exists, sheet is visible -->
@@ -10,11 +23,16 @@
         <div class="handle">    </div>
         <div class="content">
             <p class="message-text">{message.text}</p>
-            <p class="meta">
-                left {message.lat.toFixed(4)}, {message.lng.toFixed(4)}
-            </p>
+            {#if decay}
+                <p class="meta">left {decay.daysAgo} days ago. fading in {decay.daysLeft} days.</p>
+            {/if}
             <div class="actions">
-                <button class="echo-button">Echo</button>
+                <button class="echo-button" 
+                class:echoed={echoed} 
+                onclick={handleEcho} 
+                disabled={echoed}>
+                    {echoed ? 'Echoed' : 'Echo'}
+                </button>
                 <button class="letgo-button" onclick={() => mapStore.set(
                     { selectedMessage: null, composing: false })}>
                     let go
@@ -91,4 +109,13 @@
         cursor: pointer;
     }
 
+    .echo-button.echoed {
+        background: #4ecdc4;
+        animation: pulsate 1.5s ease-in-out 3;
+    }
+
+    @keyframes pulsate {
+        0%, 100% {box-shadow: 0 0 0 0 rgba(78,205,196,0.4); }
+        50% {box-shadow: 0 0 0 12px rgba(78, 205, 196, 0);}
+    }
 </style>

src/lib/components/ComposeSheet.svelte

@@ -0,0 +1,138 @@
+<script>
+    import { mapStore } from '$lib/stores/mapStore.js';
+    import { messagesStore } from '$lib/stores/messagesStore.js';
+    import { addMessage } from '$lib/firebase/messages.js'
+
+    let {lat, lng} = $props();
+
+    let text = $state('');
+    let submitting = $state(false);
+    let remaining = $derived(240-text.length);
+
+    async function handleSubmit() {
+        if (!text.trim() || remaining < 0) return;
+        submitting = true;
+
+        await addMessage(lat, lng, text.trim());
+
+        //refresh the messages store so pin is there
+        const { getNearbyMessages } = await import('$lib/firebase/messages.js');
+        const updated = await getNearbyMessages(lat, lng);
+        messagesStore.set(updated);
+
+        //reset and close
+        text = '';
+        submitting = false;
+        mapStore.set({selectedMessage: null, composing: false});
+    }
+
+</script>
+
+<div class="compose" class:visible={true}>
+    <div class="compose-header">
+        <button class="cancel" onclick={() => mapStore.set(
+            {selectedMessage: null, composing: false}
+        )}> 
+        Cancel
+        </button>
+        <span class="title">Leave a message</span> 
+        <span class="counter" class:over={remaining < 0}>{remaining}</span>
+    </div>
+
+    <textarea
+        bind:value={text}
+        placeholder="Share a moment for someone else to overhear"
+        rows="5"
+    ></textarea>
+
+    <button 
+    class="submit"
+    onclick={handleSubmit}
+    disabled={!text.trim() || remaining < 0 || submitting}>
+        {submitting ? "leaving it here..." : "leave it here"}    
+    </button>
+
+</div>
+
+<style>
+    .compose {
+        position: fixed;
+        bottom: 0;
+        left: 0;
+        right: 0;
+        background: white;
+        border-radius: 20px 20px 0 0;
+        padding: 1.2rem 1.5rem 2.5rem;
+        box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
+        z-index: 200;
+    }
+
+    .compose-header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        margin-bottom: 1rem;
+    }
+
+    .title {
+        font-weight: 600;
+        font-size: 0.95rem;
+        color: #111;
+    }
+
+    .cancel {
+        background: none;
+        border: none;
+        color: #999;
+        font-size: 0.9rem;
+        cursor: pointer;
+        padding: 0;
+    }
+
+    .counter {
+        font-size: 0.85rem;
+        color: #999;
+        font-variant-numeric: tublar-nums; 
+    }
+
+    .counter.over {
+        color: #e74c3c;
+        font-weight: 600;
+    }
+
+    textarea {
+        width: 100%;
+        border: 1.5px solid #eee;
+        border-radius: 12px;
+        padding: 0.9rem;
+        font-size: 0.95rem;
+        line-height: 1.6;
+        resize: none;
+        outline: none;
+        font-family: Georgia, 'Times New Roman', Times, serif;
+        color: #111;
+    }
+
+    textarea:focus {
+        border-color: #111;
+    }
+
+    .submit {
+        width: 100%;
+        margin-top: 0.75rem;
+        padding: 0.85rem;
+        background: #111;
+        color: white;
+        border: none;
+        border-radius: 12px;
+        font-size: 0.95rem;
+        font-weight: 500;
+        cursor: pointer;
+    }
+
+    .submit:disabled {
+        background: #ccc;
+        cursor: not-allowed;
+    }
+</style>
+

src/lib/components/MapView.Svelte

@@ -10,28 +10,9 @@
     let { lat, lng } = $props();
 
     let mapDiv;
-    let userMarker = null;
 
     let markers = []; // keep track of pins on map
 
-    /** 내 위치 마커 (메시지 핀과 구분되는 파란 점) */
-    function addUserLocationMarker(map, centerLat, centerLng) {
-        userMarker = new google.maps.Marker({
-            position: { lat: centerLat, lng: centerLng },
-            map,
-            title: 'Your location',
-            zIndex: 1000,
-            icon: {
-                path: google.maps.SymbolPath.CIRCLE,
-                scale: 10,
-                fillColor: '#4285F4',
-                fillOpacity: 1,
-                strokeColor: '#ffffff',
-                strokeWeight: 3
-            }
-        });
-    }
-
     onMount (async () => {
         const centerLat = Number(lat);
         const centerLng = Number(lng);
@@ -50,8 +31,6 @@
             disableDefaultUI: true,
             gestureHandling: 'greedy'
         });
-
-        addUserLocationMarker(mapDiv, centerLat, centerLng);
     });
 
     // function to rended pins

src/lib/components/SidePanel.svelte

@@ -1,18 +1,36 @@
 <script>
     import { mapStore } from '$lib/stores/mapStore.js';
+    import { getDecayInfo } from '$lib/utils/time.js';
+    import { echoMessage } from '$lib/firebase/messages.js'
 
     let { message } = $props(); 
+
+    let decay = $derived(
+        message ? getDecayInfo(message.createdAt, message.lastEchoAt) : null
+    );
+
+    let echoed = $state(false);
+
+    async function handleEcho() {
+        await echoMessage(message.id);
+        echoed = true;
+    }
 </script>
 
 <div class = "panel">
     {#if message}
         <div class="content">
             <p class="message-text">{message.text}</p>
-            <p class="meta">
-                left {message.lat.toFixed(4)}, {message.lng.toFixed(4)}
-            </p>
+            {#if decay}
+                <p class="meta">left {decay.daysAgo} days ago. fading in {decay.daysLeft} days.</p>
+            {/if}
             <div class="actions">
-                <button class="echo-button">Echo</button>
+                <button class="echo-button" 
+                class:echoed={echoed} 
+                onclick={handleEcho} 
+                disabled={echoed}>
+                    {echoed ? 'Echoed' : 'Echo'}
+                </button>
                 <button class="letgo-button" onclick={() => mapStore.set(
                     {selectedMessage: null, composing: false})}>
                     Let go
@@ -72,7 +90,7 @@
 
     .letgo-button {
         flex: 1;
-        padding: 0.75rem;
+        padding: 0..75rem;
         background: transparent;
         color: #111;
         border: 1.5px solid #ddd;
@@ -88,5 +106,14 @@
         text-align: center;
     }
 
+    .echo-button.echoed {
+        background: #4ecdc4;
+        animation: pulsate 1.5s ease-in-out 3;
+    }
+
+    @keyframes pulsate {
+        0%, 100% {box-shadow: 0 0 0 0 rgba(78,205,196,0.4); }
+        50% {box-shadow: 0 0 0 12px rgba(78, 205, 196, 0);}
+    }
 </style>
 

src/lib/stores/arStore.js

@@ -1,9 +0,0 @@
-import { writable } from 'svelte/store';
-
-export const arStore = writable({
-  isARMode: false,
-  currentHeading: null,
-  selectedScreenPoint: null,
-  composing: false,
-  focusedMessage: null
-});

src/lib/utils/time.js

@@ -0,0 +1,15 @@
+export function getDecayInfo(createdAt, lastEchoAt) {
+    const now = Date.now();
+    const echoTime = lastEchoAt?.toMillis() ?? createdAt.toMillis();
+    const createdTime = createdAt.toMillis(); 
+
+    const daysSinceCreated = Math.floor((now - createdTime) / (1000 * 60 * 60 * 24));
+    const daysSinceEcho = Math.floor((now - echoTime)/(1000 * 60 * 60 * 24));
+    const daysLeft = 30 - daysSinceEcho;
+
+    return {
+        daysAgo: daysSinceCreated,
+        daysLeft: Math.max(0, daysLeft),
+        isExpired: daysLeft <= 0
+    };
+}

src/routes/+page.svelte

@@ -1,17 +1,16 @@
 <script>
-    
     import { onMount } from 'svelte';
     import MapView from '$lib/components/MapView.svelte';
-    import ARView from '$lib/components/ARView.svelte';
 
     import { getNearbyMessages } from '$lib/firebase/messages.js';
     import { messagesStore } from '$lib/stores/messagesStore.js';
     import { mapStore } from '$lib/stores/mapStore.js';
-    import { arStore } from '$lib/stores/arStore.js';
 
     import BottomSheet from '$lib/components/BottomSheet.svelte';
     import SidePanel from '$lib/components/SidePanel.svelte';
 
+    import ComposeSheet from '$lib/components/ComposeSheet.svelte';
+
     let lat = $state();
     let lng = $state();
     let error = $state();
@@ -20,36 +19,28 @@
 
     let isMobile = $derived(windowWidth < 768);
 
-    async function loadLocation() {
+    onMount(() => {
         if (!navigator.geolocation) {
             error = "Your browser doesn't support geolocation :(";
-            return;
+            return; // do nothing
         }
-
         navigator.geolocation.getCurrentPosition(
-            async (position) => {
+            (position) => {
                 lat = position.coords.latitude;
                 lng = position.coords.longitude;
-
-                const messages = await getNearbyMessages(lat, lng);
-                messagesStore.set(messages);
             },
-            (geoError) => {
-                if (geoError.code === geoError.PERMISSION_DENIED) {
-                    error =
-                        'Location access is blocked. In Chrome, click the tune icon next to the URL, open Site settings, and set Location to Allow. Then refresh this page.';
-                } else if (geoError.code === geoError.POSITION_UNAVAILABLE) {
-                    error = 'Location unavailable. Check that location services are enabled on your device.';
-                } else {
-                    error = 'Could not get your location. Please try again.';
+            () => {
+                error = "Location access denied. Please enable location to use Overheard.";
             }
-            },
-            { enableHighAccuracy: true, timeout: 10000 }
         );
+        // populate the messages store 
+        navigator.geolocation.getCurrentPosition(
+            async (position) => {
+                const messages = await getNearbyMessages(position.coords.latitude, position.coords.longitude);
+                messagesStore.set(messages);
+                console.log('messages loaded:', $messagesStore);
             }
-
-    onMount(() => {
-        loadLocation();
+        );
     });
 
     
@@ -58,28 +49,16 @@
 <svelte:window bind:innerWidth={windowWidth} /> <!--this sends the windowWidth to our mobile checker -->
 
 {#if error}
-  <div class="error">
-    <p>{error}</p>
-    <button class="retry-button" onclick={loadLocation}>Try again</button>
-  </div>
+    <p class="error">{error}</p>
 {:else if lat && lng}
-  {#if $arStore.isARMode}
-    <ARView {lat} {lng} />
-  {:else}
     <MapView {lat} {lng} />
-  {/if}
 {:else}
     <p class="loading">Looking for you...</p>
 {/if}
 
-<!--showing AR button only in mapview-->
-{#if lat && lng && !$arStore.isARMode}
-  <button
-    class="ar-button"
-    onclick={() => arStore.update((state) => ({ ...state, isARMode: true }))}
-  >
-    AR
-  </button>
+<!-- map must fill the whole screen-->
+ {#if lat && lng}
+    <MapView {lat} {lng} />
 {/if}
 
 <!-- show the right panel based on mobile or desktop-->
@@ -89,6 +68,22 @@
     <SidePanel message={$mapStore.selectedMessage} />
 {/if}
 
+<!--floating action button for adding a message-->
+{#if !$mapStore.composing}
+    <button
+    class="fab"
+    onclick={() => mapStore.set(
+        {selectedMessage: null, composing: true })}>
+    +
+    </button>
+{/if}
+
+<!--compose sheet (making a message)-->
+{#if $mapStore.composing}
+    <ComposeSheet {lat} {lng} />
+{/if}
+
+
 <style>
 :global(body) {
     margin: 0;
@@ -98,47 +93,32 @@
 
 .error, .loading {
     display: flex;
-    flex-direction: column;
     align-items: center;
     justify-content: center;
-    gap: 1rem;
     height: 100vh;
-    padding: 0 1.5rem;
-    text-align: center;
     font-family: Georgia, 'Times New Roman', Times, serif;
     color: #666;
+
 }
 
-.retry-button {
-    padding: 0.75rem 1.25rem;
-    border: none;
-    border-radius: 10px;
-    background: #111;
-    color: white;
-    font-size: 0.95rem;
-    cursor: pointer;
-}
-
-.ar-button {
+.fab {
     position: fixed;
-    right: 20px;
-    bottom: 28px;
-    z-index: 20;
-
-    width: 64px;
-    height: 64px;
+    bottom: 2rem;
+    right: 1.5rem;
+    width: 56px;
+    height: 56px;
     border-radius: 50%;
-    border: none;
-
     background: #111;
     color: white;
-    font-size: 18px;
-    font-weight: 700;
-
-    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
+    font-size: 1.8rem;
+    border: none;
+    cursor: pointer;
+    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
+    z-index: 150;
+    display: flex;
+    align-items:center;
+    justify-content: center;
+    line-height: 1;
 }
 
-  .ar-button:active {
-    transform: scale(0.96);
-  }
 </style>