refactor(task-modal): enhance employee timeblock management with custom filtering and improved rendering logic

app/src/plugins/tm@modal/task/_components/employees/a-employee-select.vue

@@ -1,12 +1,14 @@
 <template>
   <div class="employee-select">
     <v-autocomplete
+      :key="`employee-select-${componentKey}`"
+      ref="employeeSelectRef"
       :model-value="modelValue.id"
       :custom-filter="customFilter"
       :match-any="true"
       label="Priradený"
       :items="enrichedEmployees"
-      item-title="_fullName"
+      :item-title="getItemTitle"
       item-value="id"
       variant="solo"
       class="employee-select__select-field"
@@ -40,7 +42,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed, toRefs } from 'vue';
+import { computed, toRefs, watch, nextTick, ref, onMounted } from 'vue';
 import { useStore } from 'vuex';
 import { useVuelidate } from '@vuelidate/core';
 import { helpers, required } from '@vuelidate/validators';
@@ -63,7 +65,65 @@ const emit = defineEmits<{
 
 const store = useStore();
 
-const enrichedEmployees = computed(() => store.getters['tm/enrichedEmployees']);
+const employeeSelectRef = ref<any>(null);
+
+// Force re-render key
+const componentKey = ref(0);
+
+// Ensure all employees have a displayable name
+const enrichedEmployees = computed(() => {
+  const employees = store.getters['tm/enrichedEmployees'] || [];
+  return employees.map((emp: any) => ({
+    ...emp,
+    _fullName:
+      emp._fullName ||
+      `${emp.name || ''} ${emp.surname || ''}`.trim() ||
+      `Employee ${emp.id}`,
+  }));
+});
+
+// Function to get item title - handles both objects and IDs
+const getItemTitle = (item: any): string => {
+  // If item is an object with _fullName, return it
+  if (item && typeof item === 'object' && item._fullName) {
+    return item._fullName;
+  }
+
+  // If item is just an ID (string or number), find the employee
+  if (item && (typeof item === 'string' || typeof item === 'number')) {
+    const employee = enrichedEmployees.value.find((emp) => emp.id == item);
+    return employee?._fullName || `Employee ${item}`;
+  }
+
+  return '';
+};
+
+// Watch for when employees list changes to force re-render
+watch(
+  () => enrichedEmployees.value.length,
+  (newLength, oldLength) => {
+    // Force component re-render when employees are loaded
+    if (newLength > 0 && newLength !== oldLength) {
+      nextTick(() => {
+        componentKey.value++;
+      });
+    }
+  },
+  { immediate: true },
+);
+
+// Watch for when the selected employee ID changes to ensure display updates
+watch(
+  () => props.modelValue.id,
+  (newId) => {
+    // When ID is set and we have employees, force re-render to ensure proper display
+    if (newId && enrichedEmployees.value.length > 0) {
+      nextTick(() => {
+        componentKey.value++;
+      });
+    }
+  },
+);
 
 // Make modelValue reactive for Vuelidate
 const { modelValue } = toRefs(props);
@@ -150,6 +210,12 @@ const validate = async (required = false) => {
   return isValid;
 };
 
+onMounted(() => {
+  setTimeout(() => {
+    console.log('Employee select ref:', employeeSelectRef.value);
+  }, 1000);
+});
+
 defineExpose({
   validate,
 });

app/src/plugins/tm@modal/task/_components/employees/a-employee-timeblock-timeline.vue

@@ -11,7 +11,13 @@
           :hour-width="hourWidth"
         />
 
-        <div class="timeline-bar">
+        <div
+          ref="timelineBar"
+          class="timeline-bar"
+          @mousemove="handleMouseMove"
+          @mouseleave="handleMouseLeave"
+          @mousedown="handleMouseDown"
+        >
           <!-- Non-working hours - before work -->
           <div
             class="non-working-hours"
@@ -47,7 +53,14 @@
             :key="`task-${index}`"
             class="scheduled-block"
             :class="{
-              'scheduled-block--blocker': ['blocker', 'adhoc', 'home_office', 'vacation', 'free_day', 'office365_blocker'].includes(task.type)
+              'scheduled-block--blocker': [
+                'blocker',
+                'adhoc',
+                'home_office',
+                'vacation',
+                'free_day',
+                'office365_blocker',
+              ].includes(task.type),
             }"
             :style="{
               left: `${getTimePosition(task._real_start)}px`,
@@ -68,11 +81,34 @@
             :title="`Other timeblock`"
           ></div>
 
+          <!-- Hover preview block -->
+          <div
+            v-if="showPreview && previewBlock"
+            class="preview-block"
+            :class="{ 'is-stretching': dragState.isStretching }"
+            :style="{
+              left: `${getTimePosition(previewBlock.start)}px`,
+              width: `${getTimeWidth(previewBlock.start, previewBlock.end)}px`,
+            }"
+            @mousedown.stop="handlePreviewMouseDown"
+          >
+            <div class="preview-time-label">
+              {{ formatTime(previewBlock.start) }} -
+              {{ formatTime(previewBlock.end) }}
+            </div>
+          </div>
+
           <!-- Current timeblock (if valid) -->
           <div
-            v-if="currentTimeblockRange.start && currentTimeblockRange.end"
+            v-if="
+              currentTimeblockRange.start &&
+              currentTimeblockRange.end &&
+              !dragState.isResizingCurrent
+            "
             class="current-timeblock"
-            :class="{ 'has-collision': collision.hasCollision }"
+            :class="{
+              'has-collision': collision.hasCollision,
+            }"
             :style="{
               left: `${getTimePosition(currentTimeblockRange.start)}px`,
               width: `${getTimeWidth(
@@ -85,6 +121,35 @@
             <div v-if="timeblockDuration > 0" class="timeblock-duration">
               {{ timeblockDuration.toFixed(2) }}h
             </div>
+
+            <!-- Resize handles -->
+            <div
+              class="resize-handle resize-handle--left"
+              @mousedown.stop="handleResizeMouseDown($event, 'left')"
+            ></div>
+            <div
+              class="resize-handle resize-handle--right"
+              @mousedown.stop="handleResizeMouseDown($event, 'right')"
+            ></div>
+          </div>
+
+          <!-- Resizing current timeblock preview -->
+          <div
+            v-if="dragState.isResizingCurrent && resizedCurrentBlock"
+            class="current-timeblock is-resizing"
+            :class="{ 'has-collision': collision.hasCollision }"
+            :style="{
+              left: `${getTimePosition(resizedCurrentBlock.start)}px`,
+              width: `${getTimeWidth(
+                resizedCurrentBlock.start,
+                resizedCurrentBlock.end,
+              )}px`,
+            }"
+          >
+            <div class="preview-time-label">
+              {{ formatTime(resizedCurrentBlock.start) }} -
+              {{ formatTime(resizedCurrentBlock.end) }}
+            </div>
           </div>
 
           <!-- Collision segments -->
@@ -104,7 +169,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed } from 'vue';
+import { ref, computed, onMounted, onUnmounted } from 'vue';
 import moment from 'moment';
 import AEmployeeTimeblockTimelineHeader from './a-employee-timeblock-timeline-header.vue';
 import type { EmployeeFullData, TimeblockData } from './types';
@@ -114,6 +179,7 @@ interface TimelineTask {
   _real_end: Date;
   subtask?: { title: string };
   blocker?: { type: string };
+  type?: string;
 }
 
 interface CollisionSegment {
@@ -146,8 +212,32 @@ const props = withDefaults(defineProps<Props>(), {
   otherTimeblocks: () => [],
 });
 
+const emit = defineEmits<{
+  (
+    e: 'timeblockUpdated',
+    payload: { starts_at_time: string; ends_at_time: string },
+  ): void;
+}>();
+
 const timelineContainer = ref<HTMLElement | null>(null);
 const timelineScroll = ref<HTMLElement | null>(null);
+const timelineBar = ref<HTMLElement | null>(null);
+
+// Check if mobile device
+const isMobile = ref(false);
+
+// Interactive state
+const showPreview = ref(false);
+const previewBlock = ref<{ start: Date; end: Date } | null>(null);
+const dragState = ref({
+  isStretching: false,
+  isResizingCurrent: false,
+  resizeEdge: null as 'left' | 'right' | null,
+  startX: 0,
+  initialStart: null as Date | null,
+  initialEnd: null as Date | null,
+});
+const resizedCurrentBlock = ref<{ start: Date; end: Date } | null>(null);
 
 // Convert other timeblocks to renderable format
 const otherTimeblocksRendered = computed(() => {
@@ -192,6 +282,303 @@ const getTimeWidth = (start: Date, end: Date): number => {
   return (endHour - startHour) * props.hourWidth - 2;
 };
 
+// Time snapping utility - snap to 15 minute intervals
+const snapToInterval = (date: Date, intervalMinutes = 15): Date => {
+  const minutes = date.getMinutes();
+  const snappedMinutes =
+    Math.round(minutes / intervalMinutes) * intervalMinutes;
+  return moment(date)
+    .set({ minute: snappedMinutes, second: 0, millisecond: 0 })
+    .toDate();
+};
+
+// Convert pixel position to time
+const positionToTime = (pixelX: number): Date => {
+  const hoursFromStart = pixelX / props.hourWidth;
+  const totalHours = props.startHour + hoursFromStart;
+  const hour = Math.floor(totalHours);
+  const minute = (totalHours % 1) * 60;
+
+  // Use current date from currentTimeblockRange or today
+  const baseDate = props.currentTimeblockRange.start
+    ? moment(props.currentTimeblockRange.start)
+    : moment();
+
+  return baseDate.set({ hour, minute, second: 0, millisecond: 0 }).toDate();
+};
+
+// Format time as HH:mm
+const formatTime = (date: Date): string => {
+  return moment(date).format('HH:mm');
+};
+
+// Check if mouse is over an existing block (x is already relative position with scroll)
+const isOverExistingBlock = (relativeX: number): boolean => {
+  // Check if over any scheduled block
+  for (const task of props.scheduledBlocks) {
+    const blockLeft = getTimePosition(task._real_start);
+    const blockWidth = getTimeWidth(task._real_start, task._real_end);
+    if (relativeX >= blockLeft && relativeX <= blockLeft + blockWidth) {
+      return true;
+    }
+  }
+
+  // Check if over any other timeblock
+  for (const tb of otherTimeblocksRendered.value) {
+    const blockLeft = getTimePosition(tb._start);
+    const blockWidth = getTimeWidth(tb._start, tb._end);
+    if (relativeX >= blockLeft && relativeX <= blockLeft + blockWidth) {
+      return true;
+    }
+  }
+
+  // Check if over current timeblock
+  if (props.currentTimeblockRange.start && props.currentTimeblockRange.end) {
+    const blockLeft = getTimePosition(props.currentTimeblockRange.start);
+    const blockWidth = getTimeWidth(
+      props.currentTimeblockRange.start,
+      props.currentTimeblockRange.end,
+    );
+    if (relativeX >= blockLeft && relativeX <= blockLeft + blockWidth) {
+      return true;
+    }
+  }
+
+  return false;
+};
+
+// Mouse move handler - show preview
+const handleMouseMove = (event: MouseEvent) => {
+  // Disable hover preview on mobile
+  if (isMobile.value) {
+    return;
+  }
+
+  if (dragState.value.isStretching) {
+    handleStretchMove(event);
+    return;
+  }
+
+  if (dragState.value.isResizingCurrent) {
+    handleResizeCurrentMove(event);
+    return;
+  }
+
+  if (!timelineScroll.value) return;
+
+  // Get position relative to scroll container, accounting for scroll
+  const rect = timelineScroll.value.getBoundingClientRect();
+  const scrollLeft = timelineScroll.value.scrollLeft;
+  const x = event.clientX - rect.left + scrollLeft;
+
+  // Don't show preview if over existing block (using relative position)
+  if (isOverExistingBlock(x)) {
+    showPreview.value = false;
+    return;
+  }
+
+  // Convert to time and snap
+  const rawTime = positionToTime(x);
+  const snappedStart = snapToInterval(rawTime);
+  const snappedEnd = moment(snappedStart).add(1, 'hour').toDate();
+
+  // Only show preview within work hours
+  const startHour = snappedStart.getHours() + snappedStart.getMinutes() / 60;
+  const endHour = snappedEnd.getHours() + snappedEnd.getMinutes() / 60;
+
+  if (
+    startHour >= props.employee.work_start &&
+    endHour <= props.employee.work_end
+  ) {
+    showPreview.value = true;
+    previewBlock.value = {
+      start: snappedStart,
+      end: snappedEnd,
+    };
+  } else {
+    showPreview.value = false;
+  }
+};
+
+// Mouse leave handler
+const handleMouseLeave = () => {
+  if (!dragState.value.isStretching && !dragState.value.isResizingCurrent) {
+    showPreview.value = false;
+  }
+};
+
+// Mouse down on timeline bar (not on preview or current block)
+const handleMouseDown = (_event: MouseEvent) => {
+  // This will only trigger if not clicking on preview or current block
+  // (those have @mousedown.stop)
+};
+
+// Preview block mouse down - start creating/stretching
+const handlePreviewMouseDown = (event: MouseEvent) => {
+  if (!previewBlock.value) return;
+
+  dragState.value.isStretching = true;
+  dragState.value.startX = event.clientX;
+  dragState.value.initialStart = previewBlock.value.start;
+  dragState.value.initialEnd = previewBlock.value.end;
+
+  event.preventDefault();
+};
+
+// Handle stretch move
+const handleStretchMove = (event: MouseEvent) => {
+  if (!dragState.value.initialStart || !timelineScroll.value) return;
+
+  const rect = timelineScroll.value.getBoundingClientRect();
+  const x = event.clientX - rect.left + timelineScroll.value.scrollLeft;
+
+  const currentTime = positionToTime(x);
+  const snappedTime = snapToInterval(currentTime);
+
+  const initialStartTime = dragState.value.initialStart.getTime();
+  const snappedTimeValue = snappedTime.getTime();
+
+  if (snappedTimeValue > initialStartTime) {
+    // Stretching right (extending end)
+    previewBlock.value = {
+      start: dragState.value.initialStart,
+      end: snappedTime,
+    };
+  } else {
+    // Stretching left (extending start)
+    previewBlock.value = {
+      start: snappedTime,
+      end: dragState.value.initialStart,
+    };
+  }
+};
+
+// Handle stretch end
+const handleStretchEnd = () => {
+  if (dragState.value.isStretching && previewBlock.value) {
+    // Emit the new timeblock
+    emit('timeblockUpdated', {
+      starts_at_time: formatTime(previewBlock.value.start),
+      ends_at_time: formatTime(previewBlock.value.end),
+    });
+  }
+
+  dragState.value.isStretching = false;
+  dragState.value.initialStart = null;
+  dragState.value.initialEnd = null;
+  showPreview.value = false;
+};
+
+// Resize handle mouse down - start resizing
+const handleResizeMouseDown = (event: MouseEvent, edge: 'left' | 'right') => {
+  if (!props.currentTimeblockRange.start || !props.currentTimeblockRange.end)
+    return;
+
+  dragState.value.isResizingCurrent = true;
+  dragState.value.resizeEdge = edge;
+  dragState.value.startX = event.clientX;
+  dragState.value.initialStart = props.currentTimeblockRange.start;
+  dragState.value.initialEnd = props.currentTimeblockRange.end;
+
+  resizedCurrentBlock.value = {
+    start: props.currentTimeblockRange.start,
+    end: props.currentTimeblockRange.end,
+  };
+
+  event.preventDefault();
+};
+
+// Handle resize current block move
+const handleResizeCurrentMove = (event: MouseEvent) => {
+  if (
+    !dragState.value.initialStart ||
+    !dragState.value.initialEnd ||
+    !timelineScroll.value
+  )
+    return;
+
+  const rect = timelineScroll.value.getBoundingClientRect();
+  const x = event.clientX - rect.left + timelineScroll.value.scrollLeft;
+
+  const currentTime = positionToTime(x);
+  const snappedTime = snapToInterval(currentTime);
+
+  if (dragState.value.resizeEdge === 'left') {
+    // Resizing left edge (changing start time)
+    // Make sure new start is before end
+    if (snappedTime < dragState.value.initialEnd) {
+      resizedCurrentBlock.value = {
+        start: snappedTime,
+        end: dragState.value.initialEnd,
+      };
+    }
+  } else if (dragState.value.resizeEdge === 'right') {
+    // Resizing right edge (changing end time)
+    // Make sure new end is after start
+    if (snappedTime > dragState.value.initialStart) {
+      resizedCurrentBlock.value = {
+        start: dragState.value.initialStart,
+        end: snappedTime,
+      };
+    }
+  }
+};
+
+// Handle resize current block end
+const handleResizeCurrentEnd = () => {
+  if (dragState.value.isResizingCurrent && resizedCurrentBlock.value) {
+    // Emit the updated timeblock
+    emit('timeblockUpdated', {
+      starts_at_time: formatTime(resizedCurrentBlock.value.start),
+      ends_at_time: formatTime(resizedCurrentBlock.value.end),
+    });
+  }
+
+  dragState.value.isResizingCurrent = false;
+  dragState.value.resizeEdge = null;
+  dragState.value.initialStart = null;
+  dragState.value.initialEnd = null;
+  resizedCurrentBlock.value = null;
+};
+
+// Global mouse up handler
+const handleGlobalMouseUp = () => {
+  if (dragState.value.isStretching) {
+    handleStretchEnd();
+  } else if (dragState.value.isResizingCurrent) {
+    handleResizeCurrentEnd();
+  }
+};
+
+// Global mouse move handler
+const handleGlobalMouseMove = (event: MouseEvent) => {
+  if (dragState.value.isStretching) {
+    handleStretchMove(event);
+  } else if (dragState.value.isResizingCurrent) {
+    handleResizeCurrentMove(event);
+  }
+};
+
+// Setup global listeners
+onMounted(() => {
+  // Detect mobile device
+  isMobile.value = window.innerWidth <= 768;
+
+  // Listen for resize to update mobile status
+  const handleResize = () => {
+    isMobile.value = window.innerWidth <= 768;
+  };
+  window.addEventListener('resize', handleResize);
+
+  document.addEventListener('mouseup', handleGlobalMouseUp);
+  document.addEventListener('mousemove', handleGlobalMouseMove);
+});
+
+onUnmounted(() => {
+  document.removeEventListener('mouseup', handleGlobalMouseUp);
+  document.removeEventListener('mousemove', handleGlobalMouseMove);
+});
+
 // Expose refs for parent component
 defineExpose({
   timelineScroll,
@@ -230,6 +617,7 @@ defineExpose({
   width: calc(24 * 60px)
   background: #fafafa
   border-radius: 4px
+  cursor: crosshair
 
   @media (max-width: 768px)
     width: calc(24 * 50px)
@@ -240,6 +628,7 @@ defineExpose({
   height: 100%
   background: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(224, 224, 224, 0.3) 10px, rgba(224, 224, 224, 0.3) 20px)
   z-index: 1
+  pointer-events: none
 
 .work-hours-bar
   position: absolute
@@ -247,6 +636,7 @@ defineExpose({
   height: 100%
   background: transparent
   z-index: 1
+  pointer-events: none
 
 .scheduled-block
   position: absolute
@@ -257,6 +647,7 @@ defineExpose({
   opacity: 0.6
   border-radius: 2px
   z-index: 2
+  pointer-events: none
 
   &--blocker
     background: rgb(176, 0, 32)
@@ -272,6 +663,40 @@ defineExpose({
   border: 2px dashed #FF9800
   border-radius: 2px
   z-index: 2
+  pointer-events: none
+
+.preview-block
+  position: absolute
+  top: 5px
+  height: 22px
+  background: #4CAF50
+  opacity: 0.6
+  border: 2px dashed #388E3C
+  border-radius: 2px
+  z-index: 5
+  cursor: crosshair
+  transition: opacity 0.2s, box-shadow 0.2s
+  display: flex
+  align-items: center
+  justify-content: center
+
+  &:hover
+    opacity: 0.8
+    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.4)
+
+  &.is-stretching
+    opacity: 0.8
+    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.6)
+    cursor: ew-resize
+
+.preview-time-label
+  font-size: 11px
+  font-weight: 600
+  color: white
+  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5)
+  white-space: nowrap
+  pointer-events: none
+  user-select: none
 
 .current-timeblock
   position: absolute
@@ -282,10 +707,37 @@ defineExpose({
   border: 2px solid #1976D2
   border-radius: 2px
   z-index: 3
+  transition: box-shadow 0.2s
 
   &.has-collision
     border-color: #ff5252
 
+  &.is-resizing
+    opacity: 0.8
+    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.6)
+    z-index: 6
+
+.resize-handle
+  position: absolute
+  top: 0
+  width: 8px
+  height: 100%
+  cursor: ew-resize
+  z-index: 4
+
+  &:hover
+    background: rgba(255, 255, 255, 0.3)
+
+  &--left
+    left: 0
+    border-top-left-radius: 2px
+    border-bottom-left-radius: 2px
+
+  &--right
+    right: 0
+    border-top-right-radius: 2px
+    border-bottom-right-radius: 2px
+
 .collision-segment
   position: absolute
   top: 5px
@@ -294,6 +746,7 @@ defineExpose({
   opacity: 0.6
   border-radius: 2px
   z-index: 4
+  pointer-events: none
 
 .timeblock-duration
   position: absolute
@@ -305,6 +758,7 @@ defineExpose({
   color: white
   text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3)
   pointer-events: none
+  user-select: none
 
 .timeline-loading
   height: 60px

app/src/plugins/tm@modal/task/_components/employees/a-employee-timeblock.vue

@@ -39,6 +39,7 @@
       :start-hour="START_HOUR"
       :end-hour="END_HOUR"
       :hour-width="hourWidth"
+      @timeblock-updated="handleTimeblockUpdated"
     />
   </div>
 </template>
@@ -269,24 +270,12 @@ const otherTimeblocksForSameDate = computed(() => {
   if (!props.modelValue.date) return [];
 
   const currentDate = moment(props.modelValue.date).format('YYYY-MM-DD');
-  const currentTimeblock = props.modelValue;
 
-  // Use allTimeblocks if available (includes all employees), otherwise fall back to current employee only
-  const timeblocksToCheck =
-    props.allTimeblocks.length > 0
-      ? props.allTimeblocks
-      : props.allEmployeeTimeblocks;
-
-  return timeblocksToCheck.filter((tb) => {
-    // Skip current timeblock - compare by reference or by matching all key properties
-    if (
-      tb === currentTimeblock ||
-      (tb.employee_id == currentTimeblock.employee_id &&
-        tb.date === currentTimeblock.date &&
-        tb.starts_at_time === currentTimeblock.starts_at_time &&
-        tb.ends_at_time === currentTimeblock.ends_at_time &&
-        tb.id === currentTimeblock.id)
-    ) {
+  // Use allEmployeeTimeblocks which contains timeblocks for this specific employee
+  // Filter out the current timeblock by comparing index directly
+  return props.allEmployeeTimeblocks.filter((tb, index) => {
+    // Skip current timeblock by index
+    if (index === props.currentIndex) {
       return false;
     }
 
@@ -405,6 +394,23 @@ const updateEndTime = (event: Event) => {
   });
 };
 
+// Handle timeblock updated from timeline (drag/drop or quick add)
+const handleTimeblockUpdated = (payload: {
+  starts_at_time: string;
+  ends_at_time: string;
+}) => {
+  emit('update:modelValue', {
+    ...props.modelValue,
+    starts_at_time: payload.starts_at_time,
+    ends_at_time: payload.ends_at_time,
+  });
+
+  // Trigger validation after timeline update
+  nextTick(() => {
+    v$.value.$touch();
+  });
+};
+
 // Expose validate method
 const validate = async () => {
   v$.value.$touch();

app/src/plugins/tm@modal/task/z-task-modal.vue

@@ -102,7 +102,7 @@
             :timeblocks="getEmployeeTimeblocks(subtask.employee_id)"
             :all-timeblocks="timeblocks"
             :deleted-timeblock-ids="deletedTimeblockIds"
-            :custom-filter="customFilter"
+            :custom-filter="getEmployeeCustomFilter(subtask.employee_id)"
             @update:timeblocks="
               updateEmployeeTimeblocks($event, subtask.employee_id)
             "
@@ -122,7 +122,7 @@
               :timeblocks="getEmployeeTimeblocks(employee.id)"
               :all-timeblocks="timeblocks"
               :deleted-timeblock-ids="deletedTimeblockIds"
-              :custom-filter="customFilter"
+              :custom-filter="getEmployeeCustomFilter(employee.id)"
               :required="index === 0"
               @update:timeblocks="updateEmployeeTimeblocks($event, employee.id)"
               @clear-employee="() => removeEmployeeAtIndex(index)"
@@ -564,6 +564,45 @@ export default {
       return this.timeblocks.filter((tb) => tb.employee_id == employeeId);
     },
 
+    // Custom filter for employee select to prevent selecting the same employee twice
+    // currentEmployeeId: the ID of the employee currently selected in this dropdown (can be null)
+    getEmployeeCustomFilter(currentEmployeeId) {
+      return (itemText, queryText, item) => {
+        // Get all selected employee IDs except the current one
+        const selectedEmployeeIds = new Set();
+
+        if (this.isDraftWithMultipleEmployees && this.subtask?.employees) {
+          // In multi-employee mode, collect all selected employee IDs except current
+          this.subtask.employees.forEach((emp) => {
+            if (emp.id && emp.id !== currentEmployeeId) {
+              selectedEmployeeIds.add(emp.id);
+            }
+          });
+        } else if (
+          this.subtask?.employee_id &&
+          this.subtask.employee_id !== currentEmployeeId
+        ) {
+          // In single employee edit mode
+          selectedEmployeeIds.add(this.subtask.employee_id);
+        }
+
+        // Filter out already selected employees (but allow current selection)
+        if (selectedEmployeeIds.has(item.id)) {
+          return false;
+        }
+
+        // Apply default text filtering (from AutocompleteMixin)
+        if (this.customFilter) {
+          return this.customFilter(itemText, queryText, item);
+        }
+
+        // Default case-insensitive text match
+        const searchText = queryText.toString().toLowerCase();
+        const text = itemText.toString().toLowerCase();
+        return text.indexOf(searchText) > -1;
+      };
+    },
+
     updateEmployeeTimeblocks(updatedTimeblocks, employeeId) {
       // Track deleted timeblocks (saved timeblocks that are no longer in the updated list)
       const updatedIds = new Set(