fix: Optional OCR-Assisted Draft Pre-Fill

vigilcare-records-web/src/composables/usePresignedUrl.ts

@@ -1,40 +1,56 @@
-import { computed, watch, onUnmounted, type Ref } from 'vue'
-import { useIntervalFn } from '@vueuse/core'
+import { ref, watch, onUnmounted, type Ref } from 'vue'
+import { getBlob } from '../api/client'
 import { useBatchStore } from '../stores/batches'
 
-const PRESIGNED_URL_TTL_MS = 15 * 60 * 1000
-const REFRESH_BUFFER_MS = 60_000
-
 export function usePresignedUrl(batchId: Ref<string | undefined>) {
   const batchStore = useBatchStore()
+  const documentUrl = ref<string | null>(null)
+  const documentError = ref<string | null>(null)
 
-  const documentUrl = computed(() => batchStore.documentUrl)
+  let currentBlobUrl: string | null = null
 
-  async function refreshUrl(): Promise<void> {
-    if (batchId.value) {
-      await batchStore.getBatch(batchId.value)
+  function revokeBlobUrl(): void {
+    if (currentBlobUrl) {
+      URL.revokeObjectURL(currentBlobUrl)
+      currentBlobUrl = null
     }
   }
 
-  const { pause, resume } = useIntervalFn(
-    () => { void refreshUrl() },
-    PRESIGNED_URL_TTL_MS - REFRESH_BUFFER_MS,
-    { immediate: false }
-  )
+  async function refreshUrl(): Promise<void> {
+    revokeBlobUrl()
+    documentUrl.value = null
+    documentError.value = null
+
+    if (!batchId.value) return
+
+    try {
+      await batchStore.getBatch(batchId.value)
+      const blob = await getBlob(`digitization-batches/${batchId.value}/document`)
+      if (!blob.size) {
+        throw new Error('Document is empty')
+      }
+      currentBlobUrl = URL.createObjectURL(blob)
+      documentUrl.value = currentBlobUrl
+    } catch (e: unknown) {
+      documentError.value = e instanceof Error ? e.message : 'Failed to load document'
+    }
+  }
 
   watch(
     batchId,
     async (id) => {
-      pause()
       if (id) {
         await refreshUrl()
-        resume()
+      } else {
+        revokeBlobUrl()
+        documentUrl.value = null
+        documentError.value = null
       }
     },
     { immediate: true }
   )
 
-  onUnmounted(pause)
+  onUnmounted(revokeBlobUrl)
 
-  return { documentUrl, refreshUrl }
+  return { documentUrl, documentError, refreshUrl }
 }