1 files changed, 128 insertions, 0 deletions
diff --git a/frontend/src/fallback.ts b/frontend/src/fallback.ts
new file mode 100644
index 00000000..fc39b272
--- /dev/null
+++ b/frontend/src/fallback.ts
@@ -0,0 +1,128 @@
+// THIS FILE MUST BE ENTIRELY SELF-CONTAINED! DO NOT USE PACKAGES!
+interface Window {
+  FocusNavController: any;
+  GamepadNavTree: any;
+  deckyFallbackLoaded?: boolean;
+}
+
+(async () => {
+  try {
+    if (window.deckyFallbackLoaded) return;
+    window.deckyFallbackLoaded = true;
+
+    // #region utils
+    function sleep(ms: number) {
+      return new Promise((res) => setTimeout(res, ms));
+    }
+    // #endregion
+
+    // #region DeckyIcon
+    const fallbackIcon = `
+      <svg class="fallbackDeckyIcon" xmlns="http://www.w3.org/2000/svg" height="100%" width="100%" viewBox="0 0 512 456">
+        <g>
+          <path
+            style="fill: none;"
+            d="M154.33,72.51v49.79c11.78-0.17,23.48,2,34.42,6.39c10.93,4.39,20.89,10.91,29.28,19.18
+            c8.39,8.27,15.06,18.13,19.61,29c4.55,10.87,6.89,22.54,6.89,34.32c0,11.78-2.34,23.45-6.89,34.32
+            c-4.55,10.87-11.21,20.73-19.61,29c-8.39,8.27-18.35,14.79-29.28,19.18c-10.94,4.39-22.63,6.56-34.42,6.39v49.77
+            c36.78,0,72.05-14.61,98.05-40.62c26-26.01,40.61-61.28,40.61-98.05c0-36.78-14.61-72.05-40.61-98.05
+            C226.38,87.12,191.11,72.51,154.33,72.51z"
+          />
+
+          <ellipse
+            transform="matrix(0.982 -0.1891 0.1891 0.982 -37.1795 32.9988)"
+            style="fill: none;"
+            cx="154.33"
+            cy="211.33"
+            rx="69.33"
+            ry="69.33"
+          />
+          <path style="fill: none;" d="M430,97h-52v187h52c7.18,0,13-5.82,13-13V110C443,102.82,437.18,97,430,97z" />
+          <path
+            style="fill: currentColor;"
+            d="M432,27h-54V0H0v361c0,52.47,42.53,95,95,95h188c52.47,0,95-42.53,95-95v-7h54c44.18,0,80-35.82,80-80V107
+            C512,62.82,476.18,27,432,27z M85,211.33c0-38.29,31.04-69.33,69.33-69.33c38.29,0,69.33,31.04,69.33,69.33
+            c0,38.29-31.04,69.33-69.33,69.33C116.04,280.67,85,249.62,85,211.33z M252.39,309.23c-26.01,26-61.28,40.62-98.05,40.62v-49.77
+            c11.78,0.17,23.48-2,34.42-6.39c10.93-4.39,20.89-10.91,29.28-19.18c8.39-8.27,15.06-18.13,19.61-29
+            c4.55-10.87,6.89-22.53,6.89-34.32c0-11.78-2.34-23.45-6.89-34.32c-4.55-10.87-11.21-20.73-19.61-29
+            c-8.39-8.27-18.35-14.79-29.28-19.18c-10.94-4.39-22.63-6.56-34.42-6.39V72.51c36.78,0,72.05,14.61,98.05,40.61
+            c26,26.01,40.61,61.28,40.61,98.05C293,247.96,278.39,283.23,252.39,309.23z M443,271c0,7.18-5.82,13-13,13h-52V97h52
+            c7.18,0,13,5.82,13,13V271z"
+          />
+        </g>
+      </svg>
+    `;
+    // #endregion
+
+    // #region findSP
+    // from @decky/ui
+    function getFocusNavController(): any {
+      return window.GamepadNavTree?.m_context?.m_controller || window.FocusNavController;
+    }
+
+    function getGamepadNavigationTrees(): any {
+      const focusNav = getFocusNavController();
+      const context = focusNav.m_ActiveContext || focusNav.m_LastActiveContext;
+      return context?.m_rgGamepadNavigationTrees;
+    }
+
+    function findSP(): Window {
+      // old (SP as host)
+      if (document.title == 'SP') return window;
+      // new (SP as popup)
+      const navTrees = getGamepadNavigationTrees();
+      return navTrees?.find((x: any) => x.m_ID == 'root_1_').Root.Element.ownerDocument.defaultView;
+    }
+    // #endregion
+
+    const fallbackCSS = `
+      .fallbackContainer {
+        width: 100vw;
+        height: 100vh;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        text-align: center;
+        flex-direction: column;
+        z-index: 99999999;
+        pointer-events: none;
+        position: absolute;
+        top: 0;
+        left: 0;
+        backdrop-filter: blur(8px) brightness(40%);
+      }
+      .fallbackDeckyIcon {
+        width: 96px;
+        height: 96px;
+        padding-bottom: 1rem;
+      }
+    `;
+
+    const fallbackHTML = `
+      <style>${fallbackCSS}</style>
+      ${fallbackIcon}
+      <span class="fallbackText">
+        <b>A crash loop has been detected and Decky has been disabled for this boot.</b>
+        <br>
+        <i>Steam will restart in 10 seconds...</i>
+      </span>
+    `;
+
+    await sleep(4000);
+
+    const win = findSP() || window;
+
+    const container = Object.assign(document.createElement('div'), {
+      innerHTML: fallbackHTML,
+    });
+    container.classList.add('fallbackContainer');
+
+    win.document.body.appendChild(container);
+
+    await sleep(10000);
+
+    SteamClient.User.StartShutdown(false);
+  } catch (e) {
+    console.error('Error showing fallback!', e);
+  }
+})();