/**
 * proactive.js — Motor Proactivo de Zelin v5.8
 * FIXES:
 * - canales buscados por nombre con find() en vez de get() por ID
 * - cooldown aplicado correctamente
 */

import * as db       from './db.js';
import { callAI, callAIBackground } from './ai.js';
import { readConfig } from './utils.js';

const config = readConfig();

// ── Cron minimalista sin dependencias externas ────────────────────────────────
function scheduleCron(cronStr, fn) {
  const tick = () => {
    const now  = new Date();
    const min  = now.getMinutes();
    const hour = now.getHours();
    const day  = now.getDay();
    const parts = cronStr.trim().split(' ');
    const matchMin  = parts[0]==='*' ? true : parts[0].startsWith('*/')
      ? min % parseInt(parts[0].slice(2)) === 0
      : parseInt(parts[0]) === min;
    const matchHour = parts[1]==='*' ? true : parseInt(parts[1]) === hour;
    const matchDay  = parts[4]==='*' ? true : parseInt(parts[4]) === day;
    if (matchMin && matchHour && matchDay) fn().catch(e=>console.error('[PROACTIVE] cron error:',e.message));
  };
  setInterval(tick, 60_000);
}

// ── Helpers para buscar canales por nombre O por ID ───────────────────────────
// FIX: config.channels guarda nombres, no IDs — hay que buscar con find()
function findChannel(client, nameOrId) {
  if (!nameOrId || !client) return null;
  // Intentar por ID primero
  const byId = client.channels.cache.get(nameOrId);
  if (byId) return byId;
  // Buscar por nombre (parcial o exacto)
  const q = nameOrId.toLowerCase().replace('#', '');
  return client.channels.cache.find(c =>
    c.isTextBased?.() && (
      c.name.toLowerCase() === q ||
      c.name.toLowerCase().includes(q)
    )
  ) || null;
}

// ── ProactiveEngine ────────────────────────────────────────────────────────────
export class ProactiveEngine {
  constructor(client) {
    this.client    = client;
    this.lastSpoke = {}; // channelId → timestamp
    this.COOLDOWN  = 30 * 60 * 1000;
  }

  init() {
    const feats = config.features ?? {};
    if (!feats.proactive) return;

    scheduleCron('0 20 * * *', () => this.eveningRecap());
    scheduleCron('0 12 * * 1', () => this.weeklyNews());
    scheduleCron('*/30 * * * *', () => this.checkAlerts());
    setInterval(() => this.checkMinecraftEvents().catch(()=>{}), 60_000);
    this.setupActivityMonitor();

    console.log('[PROACTIVE] Motor proactivo iniciado');
  }

  canSpeak(channelId) {
    const last = this.lastSpoke[channelId] || 0;
    return Date.now() - last > this.COOLDOWN;
  }

  // FIX: buscar canal por nombre con findChannel()
  async speak(channelNameOrId, prompt, context='') {
    const ch = findChannel(this.client, channelNameOrId);
    if (!ch) return;
    if (!this.canSpeak(ch.id)) return;

    try {
      const dec = await callAIBackground([{
        role:'user',
        content:'Eres Zelin. Contexto: "'+context+'". ¿Deberías mandar un mensaje ahora? SOLO JSON: {"speak":true/false,"reason":"..."}',
      }], 'fast', 60, context);
      const parsed = JSON.parse(dec.replace(/```json|```/g,'').trim());
      if (!parsed.speak) return;
    } catch { return; }

    const message = await callAIBackground([
      {role:'system', content:'Eres Zelin, asistente de TomateSMP. Sé natural y breve.'},
      {role:'user',   content: prompt},
    ], 'chat', 300, prompt);

    await ch.send(message).catch(()=>{});
    this.lastSpoke[ch.id] = Date.now();
  }

  async eveningRecap() {
    const chRef = config.channels?.general || config.channels?.announcements;
    if (!chRef) return;
    try {
      const stats = await db.getServerStats();
      await this.speak(chRef,
        'Genera un resumen divertido y muy breve del día en TomateSMP con estos datos: '+JSON.stringify(stats),
        'Resumen diario del servidor');
    } catch {}
  }

  async weeklyNews() {
    const chRef = config.channels?.general || config.channels?.announcements;
    if (!chRef) return;
    try {
      const stats = await db.getServerStats();
      await this.speak(chRef,
        'Genera un breve mensaje de inicio de semana para TomateSMP. Datos de la semana: '+JSON.stringify(stats),
        'Inicio de semana en el servidor');
    } catch {}
  }

  async checkAlerts() {
    const chRef = config.channels?.staffChat;
    if (!chRef) return;
    try {
      const r = await db.db.execute({sql:"SELECT key,value FROM zelin_memory WHERE category='alerts' AND key LIKE 'alert.pending.%' LIMIT 5",args:[]});
      for (const row of r.rows) {
        let alert;
        try { alert = typeof row.value==='string' ? JSON.parse(row.value) : row.value; } catch { continue; }
        await this.speak(chRef,
          'Informa sobre esta alerta de forma clara y concisa: '+JSON.stringify(alert),
          'Alerta automática del sistema');
        await db.db.execute({sql:"UPDATE zelin_memory SET category='alerts_done' WHERE key=?",args:[row.key]}).catch(()=>{});
      }
    } catch {}
  }

  async checkMinecraftEvents() {
    const chRef = config.channels?.welcome || config.channels?.general;
    if (!chRef) return;
    try {
      const r = await db.db.execute({sql:"SELECT key,value FROM zelin_memory WHERE category='mc_events' AND key LIKE 'mcevent.pending.%' LIMIT 10",args:[]});
      for (const row of r.rows) {
        let event;
        try { event = typeof row.value==='string' ? JSON.parse(row.value) : row.value; } catch { continue; }
        if (event.type==='new_player') {
          await this.speak(chRef,
            'Dale la bienvenida a '+event.playerName+' que acaba de unirse al servidor TomateSMP por primera vez. Sé cálido y breve.',
            'Nuevo jugador en el servidor');
        }
        await db.db.execute({sql:"UPDATE zelin_memory SET category='mc_events_done' WHERE key=?",args:[row.key]}).catch(()=>{});
      }
    } catch {}
  }

  setupActivityMonitor() {
    this.client.on('messageCreate', async (msg) => {
      if (msg.author.bot) return;
      if (!this.canSpeak(msg.channelId)) return;
      if (Math.random() > 0.10) return;

      try {
        const rel = await callAIBackground([{
          role:'user',
          content:'Mensaje Discord: "'+msg.content.slice(0,200)+'". ¿Es sobre TomateSMP o algo donde Zelin aporte algo útil? SOLO JSON: {"relevant":true/false}',
        }], 'fast', 40, msg.content);

        const parsed = JSON.parse(rel.replace(/```json|```/g,'').trim());
        if (!parsed.relevant) return;

        const reply = await callAIBackground([
          {role:'system', content:'Eres Zelin. Participa brevemente y de forma natural en la conversación.'},
          {role:'user',   content: msg.content},
        ], 'chat', 200, msg.content);

        await msg.channel.send(reply).catch(()=>{});
        this.lastSpoke[msg.channelId] = Date.now();
      } catch {}
    });
  }
}

export let proactiveEngine = null;

export function initProactive(client) {
  const feats = config.features ?? {};
  if (!feats.proactive) return;
  proactiveEngine = new ProactiveEngine(client);
  proactiveEngine.init();
}