add image deletion

2 files changed, 27 insertions, 5 deletions

diff --git a/src/lib/components/ImagePreview.svelte b/src/lib/components/ImagePreview.svelte
index 4a59d13..f5032a6 100644
--- a/src/lib/components/ImagePreview.svelte
+++ b/src/lib/components/ImagePreview.svelte
@@ -322,11 +322,7 @@
     const abort = new AbortController();
     currentAbort = abort;
 
-    downloading = true;
-    progress = 0;
-    loadError = undefined;
-
-    // Try cache first
+    // Try cache first — before setting downloading=true to avoid flicker
     const cached = await imageCache.get('full', entry.path);
     if (cached !== undefined && !abort.signal.aborted) {
       const objectUrl = URL.createObjectURL(cached.blob);
@@ -337,6 +333,10 @@
       return;
     }
 
+    downloading = true;
+    progress = 0;
+    loadError = undefined;
+
     const url = flashair.fileUrl(entry.path);
     const totalBytes = entry.size;
 
diff --git a/src/lib/flashair/client.ts b/src/lib/flashair/client.ts
index 978eb60..63ed6fb 100644
--- a/src/lib/flashair/client.ts
+++ b/src/lib/flashair/client.ts
@@ -197,6 +197,28 @@ export const flashair = {
     return { blob, meta };
   },
   /**
+   * Delete a file from the FlashAir card.
+   * Requires UPLOAD=1 in the CONFIG file.
+   * @param path - Absolute path on the card, e.g. "/DCIM/100__TSB/DSC_0001.JPG"
+   */
+  async deleteFile(path: string): Promise<void> {
+    const base = getBaseUrl();
+    const res = await fetch(`${base}/upload.cgi?DEL=${path}`);
+    if (!res.ok) {
+      if (res.status === 404) {
+        throw new Error(
+          'File deletion is not enabled. Add UPLOAD=1 to /SD_WLAN/CONFIG on the SD card and restart the FlashAir.'
+        );
+      }
+      throw new Error(`deleteFile failed: ${res.status} ${res.statusText}`);
+    }
+    const text = await res.text();
+    if (text.trim() !== 'SUCCESS') {
+      throw new Error(`deleteFile failed: card returned ${text.trim()}`);
+    }
+  },
+
+  /**
    * Recursively list all image files on the card starting from a root directory.
    * Returns files sorted by date, newest first.
    */