import { t } from './i18n/index.js';
import { getTask, updateTask } from './store.js';
import { formatLocalDate, generateUniqueId } from './utils.js';

export function addSystemEntries(task, changes) {
  const timeline = [...task.timeline];
  const fields = [
    ['progressNotes', 'progressNotesUpdated', 'progressNotesUpdated', (a, b) => ({ value: b })],
    ['status', 'status-change', 'statusChanged', (a, b) => ({ from: a, to: b })],
    ['progress', 'progress-update', 'progressUpdated', (a, b) => ({ from: a, to: b })],
    ['assignee', 'status-change', 'assigneeChanged', (a, b) => ({ from: a, to: b })],
    ['dueDate', 'status-change', 'dueDateChanged', (a, b) => ({ from: a, to: b })],
    ['priority', 'status-change', 'priorityChanged', (a, b) => ({ from: a, to: b })],
  ];
  const used = new Set(timeline.map((item) => item.id));
  fields.forEach(([field, type, key, values]) => {
    if (Object.hasOwn(changes, field) && task[field] !== changes[field])
      timeline.push({
        id: generateUniqueId(used),
        date: formatLocalDate(),
        type,
        content: '',
        event: { key, values: values(task[field], changes[field]) },
        userType: 'system',
      });
  });
  return timeline;
}
export function addTimelineEntry(taskId, content) {
  const task = getTask(taskId);
  if (!task || !content.trim()) return false;
  const id = generateUniqueId(new Set(task.timeline.map((item) => item.id)));
  task.timeline.push({
    id,
    date: formatLocalDate(),
    type: 'manual-entry',
    content: content.trim(),
    user: task.assignee || t('defaultUser'),
  });
  updateTask(taskId, { timeline: task.timeline });
  return true;
}
export function updateTimelineEntry(taskId, timelineId, content) {
  const task = getTask(taskId);
  const item = task?.timeline.find((entry) => entry.id === timelineId);
  if (!item || !content.trim()) return false;
  const wasSystem = item.userType === 'system';
  item.content = content.trim();
  item.type = 'manual-entry';
  if (wasSystem || !item.user) item.user = task.assignee || t('defaultUser');
  delete item.event;
  delete item.userType;
  updateTask(taskId, { timeline: task.timeline });
  return true;
}
export function deleteTimelineEntry(taskId, timelineId) {
  const task = getTask(taskId);
  if (!task) return false;
  const timeline = task.timeline.filter((item) => item.id !== timelineId);
  if (timeline.length === task.timeline.length) return false;
  updateTask(taskId, { timeline });
  return true;
}