const cron = require('node-cron');
const db   = require('./db');

let currentSourceId = null;
let manualOverride  = false;

const getLocalNow = () => {
  const tz = process.env.TIMEZONE || 'Indian/Antananarivo';
  try { return new Date(new Date().toLocaleString('en-US', { timeZone: tz })); }
  catch { return new Date(); }
};

const computeCurrent = () => {
  if (manualOverride) return currentSourceId;
  const schedule = db.read('schedule');
  if (!schedule.length) return null;
  const now   = getLocalNow();
  const day   = now.getDay();
  const cur   = now.getHours() * 60 + now.getMinutes();
  const entry = schedule.find(e => {
    if (!Array.isArray(e.days) || !e.days.includes(day)) return false;
    const start = e.startHour * 60 + (e.startMin || 0);
    const end   = e.endHour   * 60 + (e.endMin   || 0);
    return cur >= start && cur < end;
  });
  return entry ? entry.sourceId : null;
};

// Retourne l'URL source active — appelée à chaque requête playlist
const getCurrentUrl = () => {
  const id = computeCurrent();
  if (!id) return null;
  const sources = db.read('sources');
  const src = sources.find(s => s.id === id);
  return src ? src.url : null;
};

const getCurrentInfo = () => {
  const id = computeCurrent();
  if (!id) return null;
  const src = db.read('sources').find(s => s.id === id);
  if (!src) return null;
  return { sourceId: id, name: src.name };
};

const tick = () => {
  const id = computeCurrent();
  if (id !== currentSourceId) {
    const now = getLocalNow();
    console.log(`[scheduler] ${now.toTimeString().slice(0,5)} — ${currentSourceId||'aucun'} → ${id||'aucun'}`);
    currentSourceId = id;
  }
};

const start = () => {
  tick();
  cron.schedule('* * * * *', tick);
  const tz  = process.env.TIMEZONE || 'Indian/Antananarivo';
  console.log(`[scheduler] Démarré — ${tz} — ${getLocalNow().toTimeString().slice(0,8)}`);
};

const reload = () => { if (!manualOverride) tick(); };

const setManual = (sourceId) => {
  if (!sourceId) {
    manualOverride  = false;
    currentSourceId = computeCurrent();
    console.log('[scheduler] Retour planning auto →', currentSourceId || 'aucun');
  } else {
    manualOverride  = true;
    currentSourceId = sourceId;
    console.log('[scheduler] Manuel →', sourceId);
  }
};

const getCurrent  = () => currentSourceId;
const isManual    = () => manualOverride;

module.exports = { start, reload, getCurrent, getCurrentUrl, getCurrentInfo, setManual, isManual, getLocalNow };