parser.js

const fs = require('fs');
const path = require('path');

const DATA_FILE = path.join(__dirname, 'data.txt');
const EMPTY_TEMPLATE = `name: 
role: 
theme: light

`;

/**
 * Parses data.txt into a structured object.
 *
 * Text file format:
 *   name: <string>
 *   role: <string>
 *
 *   - <text>              standalone task
 *     * <text>            pending step   (2+ spaces + *)
 *     * [x] <text>        completed step (2+ spaces + * [x])
 *
 *   - [<name>]            project opener
 *     - <text>            task inside project (2+ spaces + -)
 *       * <text>          pending step inside project task
 *       * [x] <text>      completed step inside project task
 *
 * Returns:
 *   {
 *     user: { name: string, role: string },
 *     items: Array<Task | Project>
 *   }
 *
 *   Step    = { type: 'step',    text: string, done: boolean }
 *   Task    = { type: 'task',    text: string, steps: Step[] }
 *   Project = { type: 'project', name: string, tasks: Task[] }
 */
function parse(raw) {
  const lines = raw.split('\n');
  const result = { user: { name: '', role: '' }, items: [] };

  let currentProject = null;
  let currentTask    = null;

  for (const line of lines) {
    if (!line.trim()) continue;

    // ── User fields ──────────────────────────────────────────────────────────
    const nameMatch = line.match(/^name:\s*(.+)$/);
    if (nameMatch) { result.user.name = nameMatch[1].trim(); continue; }

    const roleMatch = line.match(/^role:\s*(.+)$/);
    if (roleMatch) { result.user.role = roleMatch[1].trim(); continue; }

    const themeMatch = line.match(/^theme:\s*(.+)$/);
    if (themeMatch) { result.user.theme = themeMatch[1].trim(); continue; }

    // ── Step: "  * [x] text" (done) or "  * text" (pending) ─────────────────
    const stepMatch = line.match(/^(\s+)\*\s+(?:\[x\]\s+)?(.+)$/i);
    if (stepMatch && currentTask) {
      const done = /^\s+\*\s+\[x\]\s+/i.test(line);
      currentTask.steps.push({ type: 'step', text: stepMatch[2].trim(), done });
      continue;
    }

    // ── Project task: "  - text" ──────────────────────────────────────────────
    const projectTaskMatch = line.match(/^\s{2,}-\s+(?!\[)(.+)$/);
    if (projectTaskMatch && currentProject) {
      currentTask = { type: 'task', text: projectTaskMatch[1].trim(), steps: [] };
      currentProject.tasks.push(currentTask);
      continue;
    }

    // ── Project opener: "- [Name]" ────────────────────────────────────────────
    const projectMatch = line.match(/^-\s+\[(.+)\]$/);
    if (projectMatch) {
      currentTask = null;
      currentProject = { type: 'project', name: projectMatch[1].trim(), tasks: [] };
      result.items.push(currentProject);
      continue;
    }

    // ── Root-level task: "- text" ─────────────────────────────────────────────
    const taskMatch = line.match(/^-\s+(.+)$/);
    if (taskMatch) {
      currentProject = null;
      currentTask = { type: 'task', text: taskMatch[1].trim(), steps: [] };
      result.items.push(currentTask);
      continue;
    }
  }

  return result;
}

let _cache = null;
let _mtime = null;

function load() {
  if (!fs.existsSync(DATA_FILE)) {
    fs.writeFileSync(DATA_FILE, EMPTY_TEMPLATE, 'utf8');
    invalidate();
  }
  const stat = fs.statSync(DATA_FILE);
  if (_cache !== null && stat.mtimeMs === _mtime) return _cache;
  const raw = fs.readFileSync(DATA_FILE, 'utf8');
  _cache = parse(raw);
  _mtime = stat.mtimeMs;
  return _cache;
}

function invalidate() {
  _cache = null;
  _mtime = null;
}

module.exports = { load, parse, invalidate };