feat(kanban): DnD + PATCH – flytta tasks mellan kolumner med optimistisk uppdatering

package.json

@@ -13,6 +13,9 @@
     "test:run": "vitest --run"
   },
   "dependencies": {
+    "@dnd-kit/accessibility": "^3.1.1",
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
     "@hookform/resolvers": "^5.2.2",
     "@tanstack/react-query": "^5.90.2",
     "class-variance-authority": "^0.7.1",
@@ -24,6 +27,7 @@
     "react-dom": "^19.1.1",
     "react-hook-form": "^7.64.0",
     "react-router-dom": "^7.9.4",
+    "sonner": "^2.0.7",
     "tailwind-merge": "^3.3.1",
     "zod": "^4.1.12",
     "zustand": "^5.0.8"

pnpm-lock.yaml

@@ -8,6 +8,15 @@ importers:
 
   .:
     dependencies:
+      '@dnd-kit/accessibility':
+        specifier: ^3.1.1
+        version: 3.1.1(react@19.2.0)
+      '@dnd-kit/core':
+        specifier: ^6.3.1
+        version: 6.3.1(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
+      '@dnd-kit/sortable':
+        specifier: ^10.0.0
+        version: 10.0.0(@dnd-kit/core@6.3.1(react-dom@19.2.0(react@19.2.0))(react@19.2.0))(react@19.2.0)
       '@hookform/resolvers':
         specifier: ^5.2.2
         version: 5.2.2(react-hook-form@7.64.0(react@19.2.0))
@@ -41,6 +50,9 @@ importers:
       react-router-dom:
         specifier: ^7.9.4
         version: 7.9.4(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
+      sonner:
+        specifier: ^2.0.7
+        version: 2.0.7(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
       tailwind-merge:
         specifier: ^3.3.1
         version: 3.3.1
@@ -260,6 +272,28 @@ packages:
     resolution: {integrity: sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==}
     engines: {node: '>=18'}
 
+  '@dnd-kit/accessibility@3.1.1':
+    resolution: {integrity: sha512-2P+YgaXF+gRsIihwwY1gCsQSYnu9Zyj2py8kY5fFvUM1qm2WA2u639R6YNVfU4GWr+ZM5mqEsfHZZLoRONbemw==}
+    peerDependencies:
+      react: '>=16.8.0'
+
+  '@dnd-kit/core@6.3.1':
+    resolution: {integrity: sha512-xkGBRQQab4RLwgXxoqETICr6S5JlogafbhNsidmrkVv2YRs5MLwpjoF2qpiGjQt8S9AoxtIV603s0GIUpY5eYQ==}
+    peerDependencies:
+      react: '>=16.8.0'
+      react-dom: '>=16.8.0'
+
+  '@dnd-kit/sortable@10.0.0':
+    resolution: {integrity: sha512-+xqhmIIzvAYMGfBYYnbKuNicfSsk4RksY2XdmJhT+HAC01nix6fHCztU68jooFiMUB01Ky3F0FyOvhG/BZrWkg==}
+    peerDependencies:
+      '@dnd-kit/core': ^6.3.0
+      react: '>=16.8.0'
+
+  '@dnd-kit/utilities@3.2.2':
+    resolution: {integrity: sha512-+MKAJEOfaBe5SmV6t34p80MMKhjvUz0vRrvVJbPT0WElzaOJ/1xs+D+KDv+tD/NE5ujfrChEcshd4fLn0wpiqg==}
+    peerDependencies:
+      react: '>=16.8.0'
+
   '@esbuild/aix-ppc64@0.25.10':
     resolution: {integrity: sha512-0NFWnA+7l41irNuaSVlLfgNT12caWJVLzp5eAVhZ0z1qpxbockccEt3s+149rE64VUI3Ml2zt8Nv5JVc4QXTsw==}
     engines: {node: '>=18'}
@@ -1655,6 +1689,12 @@ packages:
   siginfo@2.0.0:
     resolution: {integrity: sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==}
 
+  sonner@2.0.7:
+    resolution: {integrity: sha512-W6ZN4p58k8aDKA4XPcx2hpIQXBRAgyiWVkYhT7CvK6D3iAu7xjvVyhQHg2/iaKJZ1XVJ4r7XuwGL+WGEK37i9w==}
+    peerDependencies:
+      react: ^18.0.0 || ^19.0.0 || ^19.0.0-rc
+      react-dom: ^18.0.0 || ^19.0.0 || ^19.0.0-rc
+
   source-map-js@1.2.1:
     resolution: {integrity: sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==}
     engines: {node: '>=0.10.0'}
@@ -1759,6 +1799,9 @@ packages:
       typescript:
         optional: true
 
+  tslib@2.8.1:
+    resolution: {integrity: sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==}
+
   type-check@0.4.0:
     resolution: {integrity: sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==}
     engines: {node: '>= 0.8.0'}
@@ -2115,6 +2158,31 @@ snapshots:
 
   '@csstools/css-tokenizer@3.0.4': {}
 
+  '@dnd-kit/accessibility@3.1.1(react@19.2.0)':
+    dependencies:
+      react: 19.2.0
+      tslib: 2.8.1
+
+  '@dnd-kit/core@6.3.1(react-dom@19.2.0(react@19.2.0))(react@19.2.0)':
+    dependencies:
+      '@dnd-kit/accessibility': 3.1.1(react@19.2.0)
+      '@dnd-kit/utilities': 3.2.2(react@19.2.0)
+      react: 19.2.0
+      react-dom: 19.2.0(react@19.2.0)
+      tslib: 2.8.1
+
+  '@dnd-kit/sortable@10.0.0(@dnd-kit/core@6.3.1(react-dom@19.2.0(react@19.2.0))(react@19.2.0))(react@19.2.0)':
+    dependencies:
+      '@dnd-kit/core': 6.3.1(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
+      '@dnd-kit/utilities': 3.2.2(react@19.2.0)
+      react: 19.2.0
+      tslib: 2.8.1
+
+  '@dnd-kit/utilities@3.2.2(react@19.2.0)':
+    dependencies:
+      react: 19.2.0
+      tslib: 2.8.1
+
   '@esbuild/aix-ppc64@0.25.10':
     optional: true
 
@@ -3395,6 +3463,11 @@ snapshots:
 
   siginfo@2.0.0: {}
 
+  sonner@2.0.7(react-dom@19.2.0(react@19.2.0))(react@19.2.0):
+    dependencies:
+      react: 19.2.0
+      react-dom: 19.2.0(react@19.2.0)
+
   source-map-js@1.2.1: {}
 
   stackback@0.0.2: {}
@@ -3476,6 +3549,8 @@ snapshots:
     optionalDependencies:
       typescript: 5.9.3
 
+  tslib@2.8.1: {}
+
   type-check@0.4.0:
     dependencies:
       prelude-ls: 1.2.1

src/components/layout/RootLayout.tsx

@@ -2,6 +2,7 @@
 import { Outlet, NavLink } from 'react-router-dom'
 import { MeBadge } from '../../features/me/MeBadge'
 import { useAuth } from '@/auth/useAuth'
+import { Toaster } from 'sonner'
 
 export function RootLayout() {
   const { isAuthenticated, signIn } = useAuth()
@@ -24,6 +25,7 @@ export function RootLayout() {
       </header>
       <main className="mx-auto max-w-6xl px-4 py-6">
         <Outlet />
+        <Toaster richColors closeButton />
       </main>
     </div>
   )

src/features/tasks/api.ts

@@ -2,27 +2,29 @@ import { api } from '@/lib/http'
 import { useQuery } from '@tanstack/react-query'
 import type { Task, TaskStatus } from '@/types/task'
 
-export function projectTasksKey(projectId: string, params?: Record<string, string | number | undefined>) {
+export function projectTasksKey(
+  projectId: string,
+  params?: Record<string, string | number | undefined>
+) {
   return ['projectTasks', projectId, params] as const
 }
 
-export async function fetchProjectTasks(projectId: string, params?: { status?: TaskStatus }) {
+type Page<T> = { content: T[] }
+
+export async function fetchProjectTasks(
+  projectId: string,
+  params?: { status?: TaskStatus }
+): Promise<Task[]> {
   const search = new URLSearchParams()
   if (params?.status) search.set('status', params.status)
-
   const url = `api/v1/projects/${projectId}/tasks${search.size ? `?${search.toString()}` : ''}`
 
-  // Läs råsvaret och normalisera till Task[]
-  const raw = await api.get(url).json<any>()
-
-  // Stöd både ren lista och Page<T>
-  const list: unknown =
-    Array.isArray(raw) ? raw
-    : Array.isArray(raw?.content) ? raw.content
-    : Array.isArray(raw?.items) ? raw.items
-    : []
-
-  return list as Task[]
+  const raw = await api.get(url).json<unknown>()
+  if (Array.isArray(raw)) return raw as Task[]
+  if (raw && typeof raw === 'object' && Array.isArray((raw as Page<Task>).content)) {
+    return (raw as Page<Task>).content
+  }
+  return []
 }
 
 export function useProjectTasksQuery(projectId: string) {

src/features/tasks/components/DraggableTaskCard.tsx

@@ -0,0 +1,12 @@
+import { useDraggable } from '@dnd-kit/core'
+import type { Task } from '@/types/task'
+import { TaskCard } from './TaskCard'
+
+export function DraggableTaskCard({ task }: { task: Task }) {
+  const { attributes, listeners, setNodeRef } = useDraggable({ id: task.id })
+  return (
+    <div ref={setNodeRef} {...listeners} {...attributes}>
+      <TaskCard task={task} />
+    </div>
+  )
+}

src/features/tasks/components/DroppableColumn.tsx

@@ -0,0 +1,50 @@
+import { useDroppable } from '@dnd-kit/core'
+import type { Task, TaskStatus } from '@/types/task'
+import { DraggableTaskCard } from './DraggableTaskCard'
+
+export function DroppableColumn({
+  title,
+  status,
+  items,
+}: {
+  title: string
+  status: TaskStatus
+  items: Task[]
+}) {
+  const { isOver, setNodeRef } = useDroppable({ id: status })
+  const empty = items.length === 0
+
+  return (
+    <section aria-labelledby={`col-${status}`} className="flex-1 min-w-[260px]">
+      <header className="mb-2 flex items-center justify-between">
+        <h3
+          id={`col-${status}`}
+          className="text-sm font-semibold uppercase tracking-wide opacity-70"
+        >
+          {title}
+        </h3>
+        <span className="text-xs opacity-60">{items.length}</span>
+      </header>
+
+      <div
+        ref={setNodeRef}
+        role="list"
+        aria-describedby={`col-${status}`}
+        className={[
+          'space-y-2 rounded-lg p-2 transition',
+          'min-h-[240px] border-2 border-dashed',
+          empty ? 'bg-gray-50 dark:bg-zinc-900/40' : 'bg-white/50 dark:bg-zinc-900/50',
+          isOver ? 'border-indigo-500 bg-indigo-50 dark:bg-indigo-950/30' : 'border-gray-200',
+        ].join(' ')}
+      >
+        {empty ? (
+          <div className="text-xs text-gray-500 italic">
+            Släpp här för att flytta till {title}
+          </div>
+        ) : (
+          items.map((t) => <DraggableTaskCard key={t.id} task={t} />)
+        )}
+      </div>
+    </section>
+  )
+}

src/features/tasks/components/TaskCard.tsx

@@ -2,10 +2,11 @@ import type { Task } from '@/types/task'
 
 export function TaskCard({ task }: { task: Task }) {
   return (
-    <div
+    <article
       role="listitem"
       tabIndex={0}
-      className="rounded-xl border bg-white px-3 py-2 shadow-sm outline-offset-2 focus:outline focus:outline-2 focus:outline-indigo-500"
+      className="rounded-xl border bg-white dark:bg-zinc-800 px-3 py-2 shadow-sm
+                 hover:shadow-md transition outline-offset-2 focus:outline focus:outline-2 focus:outline-indigo-500"
     >
       <div className="flex items-start justify-between gap-3">
         <h4 className="text-sm font-medium leading-5">{task.title}</h4>
@@ -14,11 +15,13 @@ export function TaskCard({ task }: { task: Task }) {
         )}
       </div>
       {task.dueDate && (
-        <div className="mt-1 text-xs opacity-70">Due: {new Date(task.dueDate).toLocaleDateString()}</div>
+        <div className="mt-1 text-xs opacity-70">
+          Due: {new Date(task.dueDate).toLocaleDateString()}
+        </div>
       )}
       {task.assigneeName && (
         <div className="mt-1 text-xs opacity-70">Assignee: {task.assigneeName}</div>
       )}
-    </div>
+    </article>
   )
 }

src/features/tasks/mutations.ts

@@ -0,0 +1,47 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { api } from '@/lib/http'
+import { projectTasksKey } from './api'
+import type { Task, TaskStatus } from '@/types/task'
+import { toast } from 'sonner'
+
+async function patchTaskStatus(taskId: string, status: TaskStatus) {
+  await api.patch(`api/v1/tasks/${taskId}`, { json: { status } })
+}
+
+export function useUpdateTaskStatusMutation(projectId: string) {
+  const qc = useQueryClient()
+  return useMutation({
+    mutationFn: ({ taskId, status }: { taskId: string; status: TaskStatus }) =>
+      patchTaskStatus(taskId, status),
+
+    onMutate: async ({ taskId, status }) => {
+      const key = projectTasksKey(projectId)
+      await qc.cancelQueries({ queryKey: key })
+
+      const prev = qc.getQueryData<Task[]>(key)
+      if (Array.isArray(prev)) {
+        const next: Task[] = prev.map((t) => (t.id === taskId ? { ...t, status } : t))
+        qc.setQueryData<Task[]>(key, next) // ← optimistisk flytt i UI
+      }
+
+      toast.loading('Uppdaterar task…', { id: `task-${taskId}` })
+      return { prev, taskId }
+    },
+
+    onError: (_err, _vars, ctx) => {
+      const key = projectTasksKey(projectId)
+      if (ctx?.prev) qc.setQueryData<Task[]>(key, ctx.prev) // rollback
+      if (ctx?.taskId)
+        toast.error('Kunde inte uppdatera – ändring ångrad', { id: `task-${ctx.taskId}` })
+    },
+
+    onSuccess: (_data, vars) => {
+      toast.success('Task uppdaterad', { id: `task-${vars.taskId}` })
+    },
+
+    onSettled: () => {
+      const key = projectTasksKey(projectId)
+      qc.invalidateQueries({ queryKey: key }) // sync med server
+    },
+  })
+}

src/pages/ProjectBoardPage.tsx

@@ -1,20 +1,36 @@
 import { useParams } from 'react-router-dom'
 import { useProjectTasksQuery } from '@/features/tasks/api'
-import type { Task } from '@/types/task'
-import { KanbanColumn } from '@/features/tasks/components/KanbanColumn'
+import type { Task, TaskStatus } from '@/types/task'
+import {
+  DndContext,
+  type DragEndEvent,
+  KeyboardSensor,
+  PointerSensor,
+  closestCorners,
+  useSensor,
+  useSensors,
+} from '@dnd-kit/core'
+import { DroppableColumn } from '@/features/tasks/components/DroppableColumn'
+import { useUpdateTaskStatusMutation } from '@/features/tasks/mutations'
 
-function splitByStatus(items: Task[] | unknown) {
-  const arr = Array.isArray(items) ? items as Task[] : []
+function splitByStatus(items: Task[]) {
   return {
-    OPEN: arr.filter(t => t.status === 'OPEN'),
-    IN_PROGRESS: arr.filter(t => t.status === 'IN_PROGRESS'),
-    DONE: arr.filter(t => t.status === 'DONE'),
+    OPEN: items.filter((t) => t.status === 'OPEN'),
+    IN_PROGRESS: items.filter((t) => t.status === 'IN_PROGRESS'),
+    DONE: items.filter((t) => t.status === 'DONE'),
   }
 }
 
+function isTaskStatus(x: unknown): x is TaskStatus {
+  return x === 'OPEN' || x === 'IN_PROGRESS' || x === 'DONE'
+}
+
 export function ProjectBoardPage() {
   const { projectId = '' } = useParams()
   const { data, isLoading, isError } = useProjectTasksQuery(projectId)
+  const { mutate } = useUpdateTaskStatusMutation(projectId)
+
+  const sensors = useSensors(useSensor(PointerSensor), useSensor(KeyboardSensor))
 
   if (isLoading) return <p>Laddar tasks…</p>
   if (isError) return <p>Något gick fel när tasks skulle hämtas.</p>
@@ -22,11 +38,23 @@ export function ProjectBoardPage() {
   const tasks = data ?? []
   const cols = splitByStatus(tasks)
 
+  const onDragEnd = (e: DragEndEvent) => {
+    console.log('onDragEnd', { active: e.active.id, over: e.over?.id })
+    const taskId = String(e.active.id)
+    const dest = e.over?.id
+    if (!dest || typeof dest !== 'string') return
+    const toStatus = dest.toUpperCase()
+    if (!isTaskStatus(toStatus)) return
+    mutate({ taskId, status: toStatus })
+  }
+
   return (
-    <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
-      <KanbanColumn title="Open" status="OPEN" items={cols.OPEN ?? []} />
-      <KanbanColumn title="In progress" status="IN_PROGRESS" items={cols.IN_PROGRESS} />
-      <KanbanColumn title="Done" status="DONE" items={cols.DONE} />
+    <DndContext sensors={sensors} onDragEnd={onDragEnd} collisionDetection={closestCorners}>
+      <div className="grid grid-cols-3 gap-4"> {/* håll 3 kolumner medan du testar */}
+        <DroppableColumn title="Open" status="OPEN" items={cols.OPEN} />
+        <DroppableColumn title="In progress" status="IN_PROGRESS" items={cols.IN_PROGRESS} />
+        <DroppableColumn title="Done" status="DONE" items={cols.DONE} />
       </div>
+    </DndContext>
   )
 }