Add API call to welcome

app/src/main/assets/styles.css

@@ -25,6 +25,14 @@ p {
     margin-bottom: 30px;
 }
 
+p.error {
+    display: none;
+    color: red;
+    font-weight: 500;
+    word-wrap: break-word;
+    user-select: text;
+}
+
 .logo {
     margin-bottom: 30px;
     width: 60vw;
@@ -62,6 +70,11 @@ input.m-input:focus {
     transition: background-color 0.3s ease-in-out;
 }
 
+.m-button:disabled {
+    background-color: #ccc;
+    cursor: not-allowed;
+}
+
 .m-button.link {
     background-color: unset;
     color: var(--theme-color);

app/src/main/assets/welcome.html

@@ -13,16 +13,93 @@
             To begin, enter the URL of your Nextcloud server below.
         </p>
 
-    <input type="url" id="server-name" class="m-input"
-           placeholder="e.g. https://nextcloud.home.server">
+        <input type="url" id="server-url" class="m-input"
+            placeholder="e.g. https://nextcloud.home.server"
+            value="http://10.0.2.2:8035/"
+        />
 
-    <button class="m-button login-button">
+        <button class="m-button login-button" id="login">
             Continue to Login
         </button>
 
+        <p id="conn-error" class="error"></p>
+
         <a class="m-button link" href="https://memories.gallery/install/">
             I don't have a server
         </a>
     </div>
+
+    <script>
+        const urlBox = document.getElementById('server-url');
+        const loginButton = document.getElementById('login');
+        const connError = document.getElementById('conn-error');
+
+        function validateUrl(url) {
+            try {
+                url = new URL(url);
+                const protoOk = url.protocol === 'http:' || url.protocol === 'https:';
+                const hostOk = url.hostname.length > 0;
+                return protoOk && hostOk;
+            } catch (e) {
+                return false;
+            }
+        }
+
+        function updateLoginEnabled() {
+            loginButton.disabled = !validateUrl(urlBox.value);
+        }
+
+        function getMemoriesUrl() {
+            const url = new URL(urlBox.value);
+
+            // Add index.php to the path if it's not there already
+            if (!url.pathname.includes('/index.php')) {
+                url.pathname += '/index.php/';
+            }
+
+            // Add path to memories
+            url.pathname += 'apps/memories/';
+
+            return url;
+        }
+
+        // Update login button enabled state when the URL changes
+        urlBox.addEventListener('input', updateLoginEnabled);
+        updateLoginEnabled();
+
+        // Login button click handler
+        loginButton.addEventListener('click', async () => {
+            const url = getMemoriesUrl();
+            url.pathname += 'api/describe';
+            const urlStr = url.toString();
+
+            try {
+                urlBox.disabled = true;
+                loginButton.disabled = true;
+
+                // Abort request after 5 seconds
+                const controller = new AbortController()
+                const timeoutId = setTimeout(() => controller.abort(), 5000)
+
+                // Get API description
+                const res = await fetch(urlStr, {
+                    method: 'GET',
+                    signal: controller.signal,
+                });
+                const data = await res.json();
+
+                // API is fine, redirect to login page
+                clearTimeout(timeoutId);
+                window.nativex.login(data?.baseUrl || getMemoriesUrl().toString());
+            } catch (e) {
+                // CORS request, we know nothing about the server
+                connError.innerText = `Failed to fetch server info.\nIs Memories installed and enabled?\n${urlStr}`;
+                connError.style.display = 'block';
+            } finally {
+                urlBox.disabled = false;
+                loginButton.disabled = false;
+            }
+        });
+    </script>
 </body>
 </html>

app/src/main/java/gallery/memories/MainActivity.kt

@@ -138,8 +138,7 @@ import gallery.memories.databinding.ActivityMainBinding
         webSettings.userAgentString = "memories-native-android/0.0"
         binding.webview.clearCache(true)
         binding.webview.addJavascriptInterface(mNativeX, "nativex")
-//        binding.webview.loadUrl("http://10.0.2.2:8035/index.php/apps/memories/")
-        binding.webview.loadUrl("https://uncanny-subdue.loca.lt/index.php/apps/memories/")
+        binding.webview.loadUrl("file:///android_asset/welcome.html");
         binding.webview.setBackgroundColor(Color.TRANSPARENT)
         WebView.setWebContentsDebuggingEnabled(true);
     }

app/src/main/java/gallery/memories/NativeX.kt

@@ -6,6 +6,7 @@ import android.view.SoundEffectConstants
 import android.webkit.JavascriptInterface
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
+import android.widget.Toast
 import androidx.media3.common.util.UnstableApi
 import gallery.memories.mapper.SystemImage
 import gallery.memories.service.DownloadService
@@ -88,6 +89,15 @@ import java.net.URLDecoder
     val isNative: Boolean
         get() = true
 
+    @JavascriptInterface
+    fun login(server: String?) {
+        if (server == null) return;
+
+        mActivity.runOnUiThread {
+            Toast.makeText(mActivity, server, Toast.LENGTH_LONG).show()
+        }
+    }
+
     @JavascriptInterface
     fun setThemeColor(color: String?, isDark: Boolean) {
         // Save for getting it back on next start