refactor: improve logic

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

src/components/FolderSelectionDialog.vue

@@ -50,7 +50,7 @@ interface ServiceGroup {
 }
 
 const serviceGroups = computed<ServiceGroup[]>(() => {
-  const moveCandidate = mailStore.moveMessageCandidate
+  const moveCandidate = mailStore.moveMessageCandidates[0]
 
   if (!moveCandidate) {
     return []
@@ -111,7 +111,7 @@ const canConfirm = computed(() => {
 })
 
 watch(
-  () => [props.modelValue, mailStore.moveMessageCandidate],
+  () => [props.modelValue, mailStore.moveMessageCandidates],
   ([isOpen]) => {
     if (!isOpen) {
       return

src/components/MessageList.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, onBeforeUnmount, ref } from 'vue'
+import type { EntityIdentifier } from '@MailManager/types/common'
 import type { EntityInterface } from '@MailManager/types/entity'
 import type { MessageInterface } from '@MailManager/types/message'
 import type { CollectionObject } from '@MailManager/models/collection'
@@ -8,37 +9,64 @@ import type { CollectionObject } from '@MailManager/models/collection'
 interface Props {
   messages: EntityInterface<MessageInterface>[]
   selectedMessage?: EntityInterface<MessageInterface> | null
+  selectedMessageIds?: EntityIdentifier[]
+  selectionModeActive?: boolean
+  selectionCount?: number
+  hasSelection?: boolean
+  allCurrentMessagesSelected?: boolean
   selectedCollection?: CollectionObject | null
   loading?: boolean
 }
 
 const props = withDefaults(defineProps<Props>(), {
-  loading: false
+  loading: false,
+  selectedMessageIds: () => [],
+  selectionModeActive: false,
+  selectionCount: 0,
+  hasSelection: false,
+  allCurrentMessagesSelected: false,
 })
 
 // Emits
 const emit = defineEmits<{
-  select: [message: EntityInterface<MessageInterface>]
+  open: [message: EntityInterface<MessageInterface>]
+  toggleSelection: [message: EntityInterface<MessageInterface>]
+  activateSelectionMode: [message: EntityInterface<MessageInterface>]
+  toggleSelectAll: [value: boolean]
+  clearSelection: []
+  moveSelection: []
 }>()
 
-// Check if message is selected
+const longPressTimer = ref<number | null>(null)
-const isSelected = (message: EntityInterface<MessageInterface>): boolean => {
+const longPressActivated = ref(false)
+const suppressNextClick = ref(false)
+const LONG_PRESS_MS = 450
+
+const selectedIdSet = computed(() => new Set(props.selectedMessageIds))
+
+const isOpened = (message: EntityInterface<MessageInterface>): boolean => {
   if (!props.selectedMessage) return false
   return (
-    message.provider === props.selectedMessage.provider &&
+    message.provider === selectedMessage.value.provider &&
-    message.service === props.selectedMessage.service &&
+    message.service === selectedMessage.value.service &&
-    message.collection === props.selectedMessage.collection &&
+    message.collection === selectedMessage.value.collection &&
-    message.identifier === props.selectedMessage.identifier
+    message.identifier === selectedMessage.value.identifier
+  )
+}
+
+const isSelected = (message: EntityInterface<MessageInterface>): boolean => {
+  return selectedIdSet.value.has(
+    `${message.provider}:${String(message.service)}:${String(message.collection)}:${String(message.identifier)}` as EntityIdentifier,
   )
 }
 
 // Check if message is unread
-const isUnread = (message: EntityInterface<MessageInterface>): boolean => {
+const isUnread = (message: EntityObject): boolean => {
   return !message.properties.flags?.read
 }
 
 // Check if message is flagged
-const isFlagged = (message: EntityInterface<MessageInterface>): boolean => {
+const isFlagged = (message: EntityObject): boolean => {
   return message.properties.flags?.flagged || false
 }
 
@@ -90,12 +118,92 @@ const truncate = (text: string | null | undefined, length: number = 100): string
 
 // Handle message click
 const handleMessageClick = (message: EntityInterface<MessageInterface>) => {
-  emit('select', message)
+  if (longPressActivated.value) {
+    longPressActivated.value = false
+    return
+  }
+
+  if (suppressNextClick.value) {
+    suppressNextClick.value = false
+    return
+  }
+
+  if (props.selectionModeActive) {
+    emit('toggleSelection', message)
+    return
+  }
+
+  emit('open', message)
+}
+
+const handleSelectionToggle = (message: EntityInterface<MessageInterface>) => {
+  emit('toggleSelection', message)
+}
+
+const handleMessageMouseClick = (event: MouseEvent | KeyboardEvent, message: EntityInterface<MessageInterface>) => {
+  if (event.shiftKey && !props.selectionModeActive) {
+    event.preventDefault()
+    event.stopPropagation()
+    emit('activateSelectionMode', message)
+    return
+  }
+
+  handleMessageClick(message)
+}
+
+const handleMessageMouseDown = (event: MouseEvent, message: EntityInterface<MessageInterface>) => {
+  if (!event.shiftKey || props.selectionModeActive) {
+    return
+  }
+
+  event.preventDefault()
+  event.stopPropagation()
+  suppressNextClick.value = true
+  emit('activateSelectionMode', message)
+}
+
+const clearLongPressTimer = () => {
+  if (longPressTimer.value !== null) {
+    window.clearTimeout(longPressTimer.value)
+    longPressTimer.value = null
+  }
+}
+
+const handleTouchStart = (message: EntityInterface<MessageInterface>) => {
+  clearLongPressTimer()
+  longPressActivated.value = false
+
+  longPressTimer.value = window.setTimeout(() => {
+    if (!props.selectionModeActive) {
+      emit('activateSelectionMode', message)
+    } else {
+      emit('toggleSelection', message)
+    }
+
+    longPressActivated.value = true
+    clearLongPressTimer()
+  }, LONG_PRESS_MS)
+}
+
+const handleTouchEnd = () => {
+  clearLongPressTimer()
+}
+
+const handleTouchMove = () => {
+  clearLongPressTimer()
+}
+
+onBeforeUnmount(() => {
+  clearLongPressTimer()
+})
+
+const handleSelectAllToggle = (value: boolean | null) => {
+  emit('toggleSelectAll', value === true)
 }
 
 // Sorted messages (newest first)
 const sortedMessages = computed(() => {
-  return [...props.messages].sort((a, b) => {
+  return [...currentMessages.value].sort((a, b) => {
     const dateA = a.properties.date ? new Date(a.properties.date).getTime() : 0
     const dateB = b.properties.date ? new Date(b.properties.date).getTime() : 0
     return dateB - dateA
@@ -107,19 +215,13 @@ const unreadCount = computed(() => {
   return props.selectedCollection?.properties.unread ?? 0
 })
 
-const readCount = computed(() => {
-  const total = props.selectedCollection?.properties.total ?? 0
-  const unread = props.selectedCollection?.properties.unread ?? 0
-  return total - unread
-})
-
 const totalCount = computed(() => {
-  return props.selectedCollection?.properties.total ?? 0
+  return selectedFolder.value?.properties.total ?? 0
 })
 
 // True only when the collection explicitly provides total/unread counts
 const hasCountData = computed(() => {
-  return props.selectedCollection?.properties.total != null
+  return selectedFolder.value?.properties.total != null
 })
 </script>
 
@@ -127,16 +229,53 @@ const hasCountData = computed(() => {
   <div class="message-list">
     <!-- Header with folder name and counts -->
     <div v-if="selectedCollection" class="message-list-header">
-      <h2 class="text-h6">{{ selectedCollection.properties.label || 'Folder' }}</h2>
+      <div class="message-list-heading">
-      <div class="folder-counts text-caption text-medium-emphasis">
+        <h2 class="text-h6">{{ selectedCollection.properties.label || 'Folder' }}</h2>
-        <span v-if="hasCountData">
+        <div class="folder-counts text-caption text-medium-emphasis">
-          <span class="unread-count">{{ unreadCount }}</span>
+          <span v-if="hasCountData">
-          <span class="mx-1">/</span>
+            <span class="unread-count">{{ unreadCount }}</span>
-          <span>{{ totalCount }}</span>
+            <span class="mx-1">/</span>
-        </span>
+            <span>{{ totalCount }}</span>
-        <span v-else-if="messages.length > 0">
+          </span>
-          {{ messages.length }} loaded
+          <span v-else-if="messages.length > 0">
-        </span>
+            {{ messages.length }} loaded
+          </span>
+        </div>
+      </div>
+
+      <div v-if="selectionModeActive && messages.length > 0" class="selection-summary">
+        <div class="selection-controls">
+          <v-checkbox-btn
+            :model-value="allCurrentMessagesSelected"
+            :indeterminate="hasSelection && !allCurrentMessagesSelected"
+            density="compact"
+            hide-details
+            @update:model-value="handleSelectAllToggle"
+          />
+          <span class="text-caption text-medium-emphasis">
+            {{ selectionCount > 0 ? `${selectionCount} selected` : 'Select all loaded' }}
+          </span>
+        </div>
+
+        <div class="selection-actions">
+          <v-btn
+            size="small"
+            variant="text"
+            prepend-icon="mdi-folder-move-outline"
+            :disabled="!hasSelection"
+            @click="emit('moveSelection')"
+          >
+            Move
+          </v-btn>
+          <v-btn
+            size="small"
+            variant="text"
+            :disabled="!hasSelection"
+            @click="emit('clearSelection')"
+          >
+            Clear
+          </v-btn>
+        </div>
       </div>
     </div>
 
@@ -151,7 +290,7 @@ const hasCountData = computed(() => {
     </div>
 
     <!-- Empty state -->
-    <div v-else-if="messages.length === 0" class="pa-8 text-center">
+    <div v-else-if="currentMessages.length === 0" class="pa-8 text-center">
       <v-icon size="64" color="grey-lighten-1">mdi-email-outline</v-icon>
       <div class="text-h6 mt-4 text-medium-emphasis">No messages</div>
       <div class="text-body-2 text-medium-emphasis">
@@ -171,18 +310,36 @@ const hasCountData = computed(() => {
           :key="`${message.provider}-${message.service}-${message.collection}-${message.identifier}`"
           class="message-item"
           :class="{
+            'opened': isOpened(message),
             'selected': isSelected(message),
+            'selection-mode': selectionModeActive,
             'unread': isUnread(message)
           }"
-          @click="handleMessageClick(message)"
+          @mousedown="handleMessageMouseDown($event, message)"
+          @click="handleMessageMouseClick($event, message)"
+          @touchstart.passive="handleTouchStart(message)"
+          @touchend="handleTouchEnd"
+          @touchcancel="handleTouchEnd"
+          @touchmove="handleTouchMove"
           lines="three"
         >
           <template v-slot:prepend>
-            <v-avatar size="40" color="primary">
+            <div class="message-item-prepend">
-              <span class="text-white text-body-1">
+              <v-checkbox-btn
-                {{ (message.properties.from?.label || message.properties.from?.address || 'U')[0].toUpperCase() }}
+                v-if="selectionModeActive || isSelected(message)"
-              </span>
+                :model-value="isSelected(message)"
-            </v-avatar>
+                density="compact"
+                hide-details
+                @click.stop
+                @update:model-value="handleSelectionToggle(message)"
+              />
+
+              <v-avatar size="40" color="primary">
+                <span class="text-white text-body-1">
+                  {{ (message.properties.from?.label || message.properties.from?.address || 'U')[0].toUpperCase() }}
+                </span>
+              </v-avatar>
+            </div>
           </template>
 
           <v-list-item-title class="d-flex align-center">
@@ -241,14 +398,42 @@ const hasCountData = computed(() => {
   background-color: rgb(var(--v-theme-surface));
   flex-shrink: 0;
   display: flex;
-  align-items: center;
+  flex-direction: column;
   gap: 12px;
 
+  .message-list-heading {
+    width: 100%;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+  }
+
   h2 {
     margin: 0;
   }
 }
 
+.selection-summary {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.selection-controls {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.selection-actions {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
 .folder-counts {
   display: flex;
   align-items: center;
@@ -270,19 +455,41 @@ const hasCountData = computed(() => {
   border-left: 3px solid transparent;
 }
 
+.message-item.selection-mode {
+  cursor: default;
+}
+
+.message-item-prepend {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 72px;
+}
+
 .message-item:hover {
   background-color: rgba(var(--v-theme-on-surface), 0.04);
 }
 
-.message-item.selected {
+.message-item.opened {
   background-color: rgba(var(--v-theme-primary), 0.12);
   border-left-color: rgb(var(--v-theme-primary));
 }
 
+.message-item.selected:not(.opened) {
+  background-color: rgba(var(--v-theme-primary), 0.08);
+}
+
 .message-item.unread {
   :deep(.v-list-item-title),
   :deep(.v-list-item-subtitle:first-of-type) {
     font-weight: 600;
   }
 }
+
+@media (max-width: 960px) {
+  .selection-summary {
+    flex-direction: column;
+    align-items: flex-start;
+  }
+}
 </style>

src/components/MessageReader.vue

@@ -1,8 +1,7 @@
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
 import { useUser } from '@KTXC'
-import type { EntityInterface } from '@MailManager/types/entity'
+import type { EntityObject } from '@MailManager/models'
-import type { MessageInterface } from '@MailManager/types/message'
 import { MessageObject } from '@MailManager/models/message'
 import { SecurityLevel } from '@/utile/emailSanitizer'
 import ReaderEmpty from './reader/ReaderEmpty.vue'
@@ -12,7 +11,7 @@ import ReaderBody from './reader/ReaderBody.vue'
 
 // Props
 interface Props {
-  message?: EntityInterface<MessageInterface> | null
+  message?: EntityObject | null
 }
 
 const props = defineProps<Props>()
@@ -22,11 +21,11 @@ const { getSetting } = useUser()
 
 // Emits
 const emit = defineEmits<{
-  reply: [message: EntityInterface<MessageInterface>]
+  reply: [message: EntityObject]
-  forward: [message: EntityInterface<MessageInterface>]
+  forward: [message: EntityObject]
-  move: [message: EntityInterface<MessageInterface>]
+  move: [message: EntityObject]
-  delete: [message: EntityInterface<MessageInterface>]
+  delete: [message: EntityObject]
-  flag: [message: EntityInterface<MessageInterface>]
+  flag: [message: EntityObject]
   compose: []
 }>()
 

src/components/reader/ReaderToolbar.vue

@@ -1,11 +1,10 @@
 <script setup lang="ts">
 import { computed } from 'vue'
-import type { EntityInterface } from '@MailManager/types/entity'
+import type { EntityObject } from '@MailManager/models'
-import type { MessageInterface } from '@MailManager/types/message'
 import { SecurityLevel } from '@/utile/emailSanitizer'
 
 interface Props {
-  message: EntityInterface<MessageInterface>
+  message: EntityObject
   isHtml: boolean
   allowImages: boolean
   securityLevel: SecurityLevel

src/pages/MailPage.vue

@@ -32,10 +32,14 @@ const {
   loading,
   selectedFolder,
   selectedMessage,
+  selectedMessageIds,
+  selectionModeActive,
   composeMode,
   composeReplyTo,
-  currentMessages,
   moveDialogVisible,
+  selectionCount,
+  hasSelection,
+  allCurrentMessagesSelected,
 } = storeToRefs(mailStore)
 
 // Complex store/composable objects accessed directly (not simple refs)
@@ -50,7 +54,24 @@ onMounted(async () => {
 // Handlers — thin wrappers that delegate to the store
 const handleFolderSelect = (folder: CollectionObject) => mailStore.selectFolder(folder)
 
-const handleMessageSelect = (message: EntityObject) => mailStore.selectMessage(message, isMobile.value)
+const handleMessageOpen = (message: EntityObject) => mailStore.selectMessage(message, isMobile.value)
+
+const handleMessageSelectionToggle = (message: EntityObject) => mailStore.toggleMessageSelection(message)
+
+const handleSelectionModeActivate = (message: EntityObject) => mailStore.activateSelectionMode(message)
+
+const handleSelectAllToggle = (value: boolean) => {
+  if (value) {
+    mailStore.selectAllCurrentMessages()
+    return
+  }
+
+  mailStore.clearSelection()
+}
+
+const handleSelectionClear = () => mailStore.deactivateSelectionMode()
+
+const handleSelectionMove = () => mailStore.openMoveDialogForSelection()
 
 const handleCompose = (replyTo?: EntityObject) => mailStore.openCompose(replyTo)
 
@@ -65,7 +86,7 @@ const handleDelete = (message: EntityObject) => mailStore.deleteMessage(message)
 const handleMove = (message: EntityObject) => mailStore.openMoveDialog(message)
 
 const handleMoveConfirm = async (folder: CollectionObject) => {
-  await mailStore.moveMessage(folder)
+  await mailStore.moveMessages(folder)
 }
 
 const handleMoveCancel = () => mailStore.closeMoveDialog()
@@ -179,11 +200,24 @@ const handleFolderCreated = (folder: CollectionObject) => mailStore.notify(`Fold
           <!-- Message list panel -->
           <div class="mail-list-panel">
             <MessageList
+<<<<<<< HEAD
               :messages="currentMessages"
               :selected-message="selectedMessage"
+              :selected-message-ids="selectedMessageIds"
+              :selection-mode-active="selectionModeActive"
+              :selection-count="selectionCount"
+              :has-selection="hasSelection"
+              :all-current-messages-selected="allCurrentMessagesSelected"
               :selected-collection="selectedFolder"
+=======
+>>>>>>> 749d922 (refactor: improve logic)
               :loading="loading"
-              @select="handleMessageSelect"
+              @open="handleMessageOpen"
+              @toggle-selection="handleMessageSelectionToggle"
+              @activate-selection-mode="handleSelectionModeActivate"
+              @toggle-select-all="handleSelectAllToggle"
+              @clear-selection="handleSelectionClear"
+              @move-selection="handleSelectionMove"
             />
           </div>
 

src/stores/mailStore.ts

@@ -1,4 +1,4 @@
-import { ref, computed, shallowRef } from 'vue'
+import { ref, computed, shallowRef, watch } from 'vue'
 import { defineStore } from 'pinia'
 import { useCollectionsStore } from '@MailManager/stores/collectionsStore'
 import { useEntitiesStore } from '@MailManager/stores/entitiesStore'
@@ -6,13 +6,12 @@ import { useServicesStore } from '@MailManager/stores/servicesStore'
 import { useMailSync } from '@MailManager/composables/useMailSync'
 import { useSnackbar } from '@KTXC'
 import type { CollectionIdentifier, EntityIdentifier } from '@MailManager/types/common'
-import type { MessageInterface } from '@MailManager/types/message'
 import type { ServiceObject, CollectionObject, EntityObject } from '@MailManager/models'
 
 export const useMailStore = defineStore('mailStore', () => {
+  const servicesStore = useServicesStore()
   const collectionsStore = useCollectionsStore()
   const entitiesStore = useEntitiesStore()
-  const servicesStore = useServicesStore()
   const { showSnackbar } = useSnackbar()
 
   // Background mail sync
@@ -42,6 +41,8 @@ export const useMailStore = defineStore('mailStore', () => {
   // ── Selection State ───────────────────────────────────────────────────────
   const selectedFolder = shallowRef<CollectionObject | null>(null)
   const selectedMessage = shallowRef<EntityObject | null>(null)
+  const selectedMessageIds = ref<EntityIdentifier[]>([])
+  const selectionModeActive = ref(false)
 
   // ── Compose State ─────────────────────────────────────────────────────────
   const composeMode = ref(false)
@@ -49,7 +50,7 @@ export const useMailStore = defineStore('mailStore', () => {
 
   // ── Move State ────────────────────────────────────────────────────────────
   const moveDialogVisible = ref(false)
-  const moveMessageCandidate = shallowRef<EntityObject | null>(null)
+  const moveMessageCandidates = shallowRef<EntityObject[]>([])
 
   // ── Computed ──────────────────────────────────────────────────────────────
   const currentMessages = computed(() => {
@@ -64,6 +65,31 @@ export const useMailStore = defineStore('mailStore', () => {
     )
   })
 
+  const selectedMessageIdSet = computed(() => new Set(selectedMessageIds.value))
+
+  const selectedMessageMap = computed(() => {
+    const messageMap = new Map<EntityIdentifier, EntityObject>()
+
+    currentMessages.value.forEach(message => {
+      const identifier = _entityIdentifier(message)
+      if (selectedMessageIdSet.value.has(identifier)) {
+        messageMap.set(identifier, message)
+      }
+    })
+
+    return messageMap
+  })
+
+  const selectedMessages = computed(() => Array.from(selectedMessageMap.value.values()))
+
+  const selectionCount = computed(() => selectedMessageIds.value.length)
+
+  const hasSelection = computed(() => selectionCount.value > 0)
+
+  const allCurrentMessagesSelected = computed(() => {
+    return currentMessages.value.length > 0 && currentMessages.value.every(message => isMessageSelected(message))
+  })
+
   // ── Initialization ────────────────────────────────────────────────────────
 
   async function initialize() {
@@ -134,12 +160,20 @@ export const useMailStore = defineStore('mailStore', () => {
     }
   }
 
-  // ── Sync Helpers ──────────────────────────────────────────────────────────
+  // ── Helpers ──────────────────────────────────────────────────────────
 
   function _serviceKey(provider: string, service: string | number) {
     return `${provider}:${String(service)}`
   }
 
+  function _collectionIdentifier(collection: CollectionObject): CollectionIdentifier {
+    return `${collection.provider}:${String(collection.service)}:${String(collection.identifier)}` as CollectionIdentifier
+  }
+
+  function _entityIdentifier(entity: EntityObject): EntityIdentifier {
+    return `${entity.provider}:${String(entity.service)}:${String(entity.collection)}:${String(entity.identifier)}` as EntityIdentifier
+  }
+
   function _setServiceFolderLoading(provider: string, service: string | number, loadingState: boolean) {
     serviceFolderLoadingState.value = {
       ...serviceFolderLoadingState.value,
@@ -208,42 +242,90 @@ export const useMailStore = defineStore('mailStore', () => {
     return serviceFolderErrorState.value[_serviceKey(provider, service)] ?? null
   }
 
-  function _entityIdentifier(entity: EntityObject): EntityIdentifier {
+  function _serviceFor(provider: string, serviceIdentifier: string | number) {
-    return `${entity.provider}:${String(entity.service)}:${String(entity.collection)}:${String(entity.identifier)}` as EntityIdentifier
+    return servicesStore.services.find(service =>
+      service.provider === provider &&
+      String(service.identifier) === String(serviceIdentifier),
+    ) ?? null
   }
 
-  function _collectionIdentifier(collection: CollectionObject): CollectionIdentifier {
+  function _reloadFolderMessages(folder: CollectionObject) {
-    return `${collection.provider}:${String(collection.service)}:${String(collection.identifier)}` as CollectionIdentifier
+    return entitiesStore.list({
+      [folder.provider]: {
+        [String(folder.service)]: {
+          [String(folder.identifier)]: true,
+        },
+      },
+    })
   }
 
-  function _isSameMessage(left: EntityObject | null, right: EntityObject): boolean {
+  function _setSelectedMessageIds(nextIds: EntityIdentifier[]) {
-    if (!left) {
+    selectedMessageIds.value = Array.from(new Set(nextIds))
-      return false
+  }
+
+  function _removeSelection(sourceIdentifiers: EntityIdentifier[]) {
+    if (sourceIdentifiers.length === 0 || selectedMessageIds.value.length === 0) {
+      return
     }
 
-    return (
+    const removedIds = new Set(sourceIdentifiers)
-      left.provider === right.provider &&
+    selectedMessageIds.value = selectedMessageIds.value.filter(identifier => !removedIds.has(identifier))
-      String(left.service) === String(right.service) &&
-      String(left.collection) === String(right.collection) &&
-      String(left.identifier) === String(right.identifier)
-    )
   }
 
+  function _reconcileSelection() {
+    if (!selectedFolder.value) {
+      clearSelection()
+      selectedMessage.value = null
+      return
+    }
+
+    const currentMessageIdentifiers = new Set(currentMessages.value.map(message => _entityIdentifier(message)))
+    const nextSelectedIds = selectedMessageIds.value.filter(identifier => currentMessageIdentifiers.has(identifier))
+
+    if (nextSelectedIds.length !== selectedMessageIds.value.length) {
+      selectedMessageIds.value = nextSelectedIds
+    }
+
+    if (selectedMessage.value && !currentMessageIdentifiers.has(_entityIdentifier(selectedMessage.value))) {
+      selectedMessage.value = null
+    }
+  }
+
+  function _formatMoveNotification(successCount: number, failureCount: number, targetFolder: CollectionObject) {
+    const folderLabel = targetFolder.properties.label || String(targetFolder.identifier)
+
+    if (failureCount === 0) {
+      return {
+        message: successCount === 1
+          ? `Message moved to "${folderLabel}"`
+          : `${successCount} messages moved to "${folderLabel}"`,
+        color: 'success' as const,
+      }
+    }
+
+    return {
+      message: successCount === 0
+        ? `Move failed for ${failureCount === 1 ? '1 message' : `${failureCount} messages`}`
+        : `Moved ${successCount} ${successCount === 1 ? 'message' : 'messages'} to "${folderLabel}". ${failureCount} failed.`,
+      color: successCount === 0 ? 'error' as const : 'warning' as const,
+    }
+  }
+
+  watch(currentMessages, () => {
+    _reconcileSelection()
+  })
+
   // ── Actions ───────────────────────────────────────────────────────────────
 
   async function selectFolder(folder: CollectionObject) {
     selectedFolder.value = folder
     selectedMessage.value = null
+    clearSelection()
+    selectionModeActive.value = false
     composeMode.value = false
 
     try {
-      await entitiesStore.list({
+      await _reloadFolderMessages(folder)
-        [folder.provider]: {
-          [folder.service]: {
-            [folder.identifier]: true,
-          },
-        },
-      })
     } catch (error) {
       console.error('[Mail] Failed to load messages:', error)
     }
@@ -266,14 +348,79 @@ export const useMailStore = defineStore('mailStore', () => {
     selectedMessage.value = null
   }
 
-  function openMoveDialog(message: EntityObject) {
+  function isMessageSelected(message: EntityObject) {
-    moveMessageCandidate.value = message
+    return selectedMessageIdSet.value.has(_entityIdentifier(message))
+  }
+
+  function toggleMessageSelection(message: EntityObject) {
+    const identifier = _entityIdentifier(message)
+
+    selectionModeActive.value = true
+
+    if (selectedMessageIdSet.value.has(identifier)) {
+      selectedMessageIds.value = selectedMessageIds.value.filter(selectedId => selectedId !== identifier)
+
+      if (selectedMessageIds.value.length === 0) {
+        selectionModeActive.value = false
+      }
+
+      return
+    }
+
+    _setSelectedMessageIds([...selectedMessageIds.value, identifier])
+  }
+
+  function selectAllCurrentMessages() {
+    selectionModeActive.value = true
+    _setSelectedMessageIds(currentMessages.value.map(message => _entityIdentifier(message)))
+  }
+
+  function activateSelectionMode(message?: EntityObject) {
+    selectionModeActive.value = true
+
+    if (message) {
+      const identifier = _entityIdentifier(message)
+
+      if (!selectedMessageIdSet.value.has(identifier)) {
+        _setSelectedMessageIds([...selectedMessageIds.value, identifier])
+      }
+    }
+  }
+
+  function deactivateSelectionMode() {
+    selectionModeActive.value = false
+    clearSelection()
+  }
+
+  function clearSelection() {
+    selectedMessageIds.value = []
+  }
+
+  function openMoveDialog(messages: EntityObject | EntityObject[]) {
+    const nextCandidates = Array.isArray(messages) ? messages : [messages]
+
+    moveMessageCandidates.value = Array.from(
+      new Map(nextCandidates.map(candidate => [_entityIdentifier(candidate), candidate])).values(),
+    )
+
+    if (moveMessageCandidates.value.length === 0) {
+      return
+    }
+
     moveDialogVisible.value = true
   }
 
+  function openMoveDialogForSelection() {
+    if (selectedMessages.value.length === 0) {
+      return
+    }
+
+    openMoveDialog(selectedMessages.value)
+  }
+
   function closeMoveDialog() {
     moveDialogVisible.value = false
-    moveMessageCandidate.value = null
+    moveMessageCandidates.value = []
   }
 
   function closeCompose() {
@@ -291,24 +438,20 @@ export const useMailStore = defineStore('mailStore', () => {
     }
   }
 
-  async function deleteMessage(message: EntityObject) {
+  async function moveMessages(targetFolder: CollectionObject) {
-    // TODO: implement delete via entity / collection store
+    const candidates = moveMessageCandidates.value
-    console.log('[Mail] Delete message:', message.identifier)
-  }
 
-  async function moveMessage(targetFolder: CollectionObject) {
+    if (candidates.length === 0) {
-    const message = moveMessageCandidate.value
-
-    if (!message) {
       return
     }
 
-    const isSameCollection =
+    const movableCandidates = candidates.filter(message => !(
       targetFolder.provider === message.provider &&
       String(targetFolder.service) === String(message.service) &&
       String(targetFolder.identifier) === String(message.collection)
+    ))
 
-    if (isSameCollection) {
+    if (movableCandidates.length === 0) {
       closeMoveDialog()
       return
     }
@@ -316,32 +459,59 @@ export const useMailStore = defineStore('mailStore', () => {
     loading.value = true
 
     try {
-      const sourceIdentifier = _entityIdentifier(message)
+      const sourceIdentifiers = movableCandidates.map(message => _entityIdentifier(message))
-      const response = await entitiesStore.move(_collectionIdentifier(targetFolder), [sourceIdentifier])
+      const response = await entitiesStore.move(_collectionIdentifier(targetFolder), sourceIdentifiers)
-      const result = response[sourceIdentifier]
+      const successfulMoves: EntityIdentifier[] = []
+      const failedMoves: string[] = []
 
-      if (!result || !result.success) {
+      Object.entries(response).forEach(([sourceIdentifier, result]) => {
-        throw new Error(result && 'error' in result ? result.error : 'Failed to move message')
+        if (result.success) {
+          successfulMoves.push(sourceIdentifier as EntityIdentifier)
+          return
+        }
+
+        failedMoves.push(result.error)
+      })
+
+      if (successfulMoves.length === 0) {
+        throw new Error(failedMoves[0] ?? 'Failed to move messages')
       }
 
-      if (_isSameMessage(selectedMessage.value, message)) {
+      _removeSelection(successfulMoves)
+
+      if (selectedMessage.value && successfulMoves.includes(_entityIdentifier(selectedMessage.value))) {
         selectedMessage.value = null
       }
 
-      const service = servicesStore.services.find(entry =>
+      if (selectedMessageIds.value.length === 0) {
-        entry.provider === message.provider &&
+        selectionModeActive.value = false
-        String(entry.identifier) === String(message.service),
-      )
-
-      if (service) {
-        void loadFoldersForService(service)
       }
 
-      notify(`Message moved to "${targetFolder.properties.label || targetFolder.identifier}"`, 'success')
       closeMoveDialog()
+
+      const servicesToRefresh = new Map<string, ServiceObject>()
+      movableCandidates.forEach(message => {
+        const service = _serviceFor(message.provider, message.service)
+        if (service && service.identifier !== null) {
+          servicesToRefresh.set(`${service.provider}:${String(service.identifier)}`, service)
+        }
+      })
+
+      const targetService = _serviceFor(targetFolder.provider, targetFolder.service)
+      if (targetService && targetService.identifier !== null) {
+        servicesToRefresh.set(`${targetService.provider}:${String(targetService.identifier)}`, targetService)
+      }
+
+      await Promise.allSettled([
+        ...Array.from(servicesToRefresh.values()).map(service => loadFoldersForService(service)),
+        ...(selectedFolder.value ? [_reloadFolderMessages(selectedFolder.value)] : []),
+      ])
+
+      const notification = _formatMoveNotification(successfulMoves.length, failedMoves.length, targetFolder)
+      notify(notification.message, notification.color)
     } catch (error) {
-      const messageText = error instanceof Error ? error.message : 'Failed to move message'
+      const messageText = error instanceof Error ? error.message : 'Failed to move messages'
-      console.error('[Mail] Failed to move message:', error)
+      console.error('[Mail] Failed to move messages:', error)
       notify(messageText, 'error')
       throw error
     } finally {
@@ -349,6 +519,11 @@ export const useMailStore = defineStore('mailStore', () => {
     }
   }
 
+  async function deleteMessage(message: EntityObject) {
+    // TODO: implement delete via entity / collection store
+    console.log('[Mail] Delete message:', message.identifier)
+  }
+
   function toggleSidebar() {
     sidebarVisible.value = !sidebarVisible.value
   }
@@ -376,27 +551,41 @@ export const useMailStore = defineStore('mailStore', () => {
     loading,
     selectedFolder,
     selectedMessage,
+    selectedMessageIds,
+    selectionModeActive,
     composeMode,
     composeReplyTo,
     moveDialogVisible,
-    moveMessageCandidate,
+    moveMessageCandidates,
     serviceFolderLoadingState,
     serviceFolderLoadedState,
     serviceFolderErrorState,
 
     // Computed
     currentMessages,
+    selectedMessageMap,
+    selectedMessages,
+    selectionCount,
+    hasSelection,
+    allCurrentMessagesSelected,
 
     // Actions
     selectFolder,
     selectMessage,
+    isMessageSelected,
+    activateSelectionMode,
+    deactivateSelectionMode,
+    toggleMessageSelection,
+    selectAllCurrentMessages,
+    clearSelection,
     openCompose,
     openMoveDialog,
+    openMoveDialogForSelection,
     closeMoveDialog,
     closeCompose,
     afterSent,
     deleteMessage,
-    moveMessage,
+    moveMessages,
     toggleSidebar,
     openSettings,
     notify,