task.ts

import type { TaskPriority, TaskStatus } from '@/types/task';

/**
 * Language-neutral domain structure only. Display labels live in the i18n
 * catalog (`src/i18n`), keyed by these same status/priority values — so
 * translating the UI never touches this file or any component.
 */

/** Status columns on the board, in display order. */
export const BOARD_COLUMN_STATUSES: readonly TaskStatus[] = [
  'todo',
  'in_progress',
  'done',
  'archived',
];

/**
 * Legal next statuses per current status — mirrors the backend state machine.
 * The UI uses this to only offer valid transitions; the backend remains the
 * source of truth and still rejects anything illegal.
 */
export const ALLOWED_TRANSITIONS: Record<TaskStatus, TaskStatus[]> = {
  todo: ['in_progress', 'archived'],
  in_progress: ['todo', 'done', 'archived'],
  done: ['archived'],
  archived: [],
};

/** Priority values in display order (highest first); labels come from i18n. */
export const PRIORITY_DISPLAY_ORDER: readonly TaskPriority[] = [3, 2, 1];

/** Page size for the board's initial SSR fetch and each "Load more". */
export const BOARD_PAGE_SIZE = 10;