#!/usr/bin/env node
// Usage: node tools/ha-history.mjs <entity_id>[,<entity_id>...] [debut] [fin]
//        node tools/ha-history.mjs sensor.victron_battery_soc 2026-08-25T00:00 2026-08-25T10:00
//        node tools/ha-history.mjs input_boolean.evcs_advisor_apply_night_target -48h
//
// Lit l'historique d'états via l'API REST de Home Assistant (jeton dans .env,
// même mécanique que tools/ha-service.mjs).
//
// ⚠️ PIÈGE VÉRIFIÉ : /api/history/period ne renvoie QU'UNE SEULE JOURNÉE si
// end_time est omis, sans le signaler. Ce script impose donc toujours les deux
// bornes.
//
// Les MCP du projet ne donnent que l'état courant : pour toute analyse
// a posteriori (qui a changé quoi, et quand), il faut l'historique.

import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');

function loadToken() {
  if (process.env.HA_TOKEN) return process.env.HA_TOKEN;
  const envPath = path.join(ROOT, '.env');
  if (!fs.existsSync(envPath)) {
    console.error('Jeton introuvable : ni $HA_TOKEN, ni fichier .env.');
    process.exit(1);
  }
  for (const line of fs.readFileSync(envPath, 'utf8').split('\n')) {
    const m = line.match(/^\s*HA_TOKEN\s*=\s*(.+?)\s*$/);
    if (m) return m[1].replace(/^["']|["']$/g, '');
  }
  console.error('HA_TOKEN absent du fichier .env');
  process.exit(1);
}

const HA_URL = process.env.HA_URL || 'http://10.10.10.17:8123';
const entities = (process.argv[2] || '').split(',').filter(Boolean);
if (!entities.length) {
  console.error('Usage: node tools/ha-history.mjs <entity_id>[,...] [debut|-Nh] [fin]');
  process.exit(1);
}

function parseBound(arg, fallback) {
  if (!arg) return fallback;
  const rel = arg.match(/^-(\d+)h$/);
  if (rel) return new Date(Date.now() - Number(rel[1]) * 3600e3);
  return new Date(arg);
}

const end = parseBound(process.argv[4], new Date());
const start = parseBound(process.argv[3], new Date(end.getTime() - 24 * 3600e3));

const url =
  `${HA_URL}/api/history/period/${start.toISOString()}` +
  `?end_time=${encodeURIComponent(end.toISOString())}` +
  `&filter_entity_id=${encodeURIComponent(entities.join(','))}` +
  `&minimal_response&significant_changes_only`;

const res = await fetch(url, { headers: { Authorization: `Bearer ${loadToken()}` } });
if (!res.ok) {
  console.error(`HTTP ${res.status} — ${await res.text()}`);
  process.exit(1);
}
const series = await res.json();

const fmt = (iso) =>
  new Date(iso).toLocaleString('fr-FR', {
    timeZone: 'Europe/Paris',
    day: '2-digit', month: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit',
  });

console.log(`Fenêtre : ${fmt(start.toISOString())} → ${fmt(end.toISOString())} (heure de Paris)\n`);
for (const rows of series) {
  if (!rows.length) continue;
  console.log(`=== ${rows[0].entity_id} (${rows.length} points) ===`);
  let prev = null;
  for (const r of rows) {
    if (r.state === prev) continue;
    console.log(`  ${fmt(r.last_changed || r.last_updated)}  ${r.state}`);
    prev = r.state;
  }
  console.log('');
}