ТЗ: Real-time Kanban-доска с WebSockets / SSE и локальным стейтом Zustand

// store/kanbanStore.ts
import { create } from 'zustand'

export interface Task {
  id: string
  title: string
  columnId: string
  version: number
}

interface KanbanState {
  tasks: Record<string, Task>
  moveTask: (taskId: string, targetColId: string) => void
  applyRemoteUpdate: (task: Task) => void
}

export const useKanbanStore = create<KanbanState>((set) => ({
  tasks: {},

  moveTask: (taskId, targetColId) => {
    set((state) => {
      const task = state.tasks[taskId]
      if (!task || task.columnId === targetColId) return state

      return {
        tasks: {
          ...state.tasks,
          [taskId]: {
            ...task,
            columnId: targetColId,
            version: task.version + 1
          }
        }
      }
    })
  },

  applyRemoteUpdate: (remoteTask) => {
    set((state) => {
      const localTask = state.tasks[remoteTask.id]
      // Разрешение конфликтов: принимаем обновление, если версия новее
      if (!localTask || remoteTask.version >= localTask.version) {
        return {
          tasks: { ...state.tasks, [remoteTask.id]: remoteTask }
        }
      }
      return state
    })
  }
}))