feat: mail entity download

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/stores/entitiesStore.ts

@@ -7,7 +7,8 @@ import { defineStore } from 'pinia'
 import { entityService } from '../services'
 import { EntityObject, MessageObject } from '../models'
 import type {
-  EntityListStreamRequest,
+  EntityBlobSelector,
+  EntityDownloadRequest,
   EntityTransmitRequest,
   EntityTransmitResponse,
 } from '../types/entity'
@@ -18,7 +19,7 @@ import type {
   ListRange,
   ListSort,
 } from '../types/common'
-import type { MessageInterface } from '@/types/message'
+import type { MessageInterface, MessagePartInterface } from '@/types/message'
 
 export const useEntitiesStore = defineStore('mailEntitiesStore', () => {
   // State
@@ -184,15 +185,15 @@ export const useEntitiesStore = defineStore('mailEntitiesStore', () => {
       const response = await entityService.delta({ sources })
       
       // Process delta and update store
-      Object.entries(response).forEach(([provider, providerData]) => {
+      Object.entries(response).forEach(([, providerData]) => {
         // Skip if no changes for provider
         if (providerData === false) return
         
-        Object.entries(providerData).forEach(([service, serviceData]) => {
+        Object.entries(providerData).forEach(([, serviceData]) => {
           // Skip if no changes for service
           if (serviceData === false) return
           
-          Object.entries(serviceData).forEach(([collection, collectionData]) => {
+          Object.entries(serviceData).forEach(([, collectionData]) => {
             // Skip if no changes for collection
             if (collectionData === false) return
             
@@ -474,6 +475,39 @@ export const useEntitiesStore = defineStore('mailEntitiesStore', () => {
     }
   }
 
+  async function download(target: EntityIdentifier, part?: Partial<MessagePartInterface>) {
+    let targetPart: EntityBlobSelector | undefined = undefined
+    if (part && (part.blobId || part.partId || part.cid)) {
+      targetPart = {
+        blobId: part.blobId ?? undefined,
+        partId: part.partId ?? undefined,
+        cid: part.cid ?? undefined,
+      }
+    }
+
+    let filename: string
+    if (part && part.name && part.name.trim().length > 0) {
+      filename = part.name.trim()
+    } else if (part) {
+      filename = `attachment-${part.partId || part.blobId || part.cid || 'unknown'}`
+    } else {
+      filename = 'message.eml'
+    }
+
+    const request: EntityDownloadRequest = {
+      target,
+      part: targetPart,
+      filename,
+    }
+
+    try {
+      entityService.download(request)
+    } catch (error: any) {
+      console.error('[Mail Manager][Store] - Failed to submit attachment download:', error)
+      throw error
+    }
+  }
+
   // Return public API
   return {
     // State (readonly)
@@ -495,5 +529,6 @@ export const useEntitiesStore = defineStore('mailEntitiesStore', () => {
     delta,
     move,
     transmit,
+    download,
   }
 })