/**
 * Store Context — helpers para inyectar info de la tienda en el agente.
 *
 * Schema canónico de delivery_zones (JSONB en tenant_settings):
 *   {
 *     zones: [
 *       {
 *         id: "centro",
 *         name: "Centro / Microcentro",
 *         polygon: { type: "Polygon", coordinates: [[[lng,lat], ...]] },
 *         delivery_cost: 1500,
 *         delivery_days: ["lun","mar","mie","jue","vie","sab"],
 *         delivery_hours: { start: "10:00", end: "20:00" },
 *         min_order_amount: 0,
 *         enabled: true
 *       }
 *     ],
 *     default_center: [lng, lat]   // opcional, para el editor
 *   }
 */

import { findZoneForPoint } from "./lib/geo.js";

const DAY_KEYS_SHORT = ["lun", "mar", "mie", "jue", "vie", "sab", "dom"];
const DAY_NAMES = {
  lun: "Lunes", mar: "Martes", mie: "Miércoles",
  jue: "Jueves", vie: "Viernes", sab: "Sábado", dom: "Domingo",
};

function todayShortKey() {
  // Date.getDay(): 0=Dom..6=Sab → mapeamos a lun..dom (0=lun)
  return DAY_KEYS_SHORT[(new Date().getDay() + 6) % 7];
}

function pickDaySlot(scheduleObj, dayKey) {
  if (!scheduleObj || typeof scheduleObj !== "object") return null;
  return scheduleObj[dayKey] || null;
}

function formatDaySlot(slot) {
  if (!slot) return null;
  if (slot.enabled === false) return null;
  const start = (slot.start || "").slice(0, 5);
  const end = (slot.end || "").slice(0, 5);
  if (!start || !end) return null;
  return `${start} a ${end}`;
}

function getZones(deliveryZones) {
  if (!deliveryZones || typeof deliveryZones !== "object") return [];
  if (!Array.isArray(deliveryZones.zones)) return [];
  return deliveryZones.zones.filter((z) => z && z.enabled !== false);
}

/**
 * Devuelve los nombres de zonas habilitadas (sin polygon, para UI/log).
 */
export function getDeliveryZoneNames(deliveryZones) {
  return getZones(deliveryZones).map((z) => String(z.name || z.id || "").trim()).filter(Boolean);
}

/**
 * Verifica si una ubicación (lat/lng) cae dentro de alguna zona habilitada.
 *
 * @param {Object} args
 * @param {{lat:number, lng:number}} [args.location]
 * @param {Object} args.storeConfig
 * @returns {{inZone:boolean, reason:string, matched_zone?:Object, zones:Array}}
 */
export function checkAddressInZone({ location, storeConfig }) {
  const allZones = getZones(storeConfig?.delivery_zones);
  if (!allZones.length) {
    return { inZone: true, reason: "no_zones_configured", zones: [] };
  }
  if (!location || typeof location.lat !== "number" || typeof location.lng !== "number") {
    return {
      inZone: false,
      reason: "need_location",
      zones: allZones.map(zoneSummary),
    };
  }
  const matched = findZoneForPoint(location.lng, location.lat, allZones);
  if (matched) {
    return { inZone: true, reason: "matched", matched_zone: zoneSummary(matched), zones: allZones.map(zoneSummary) };
  }
  return { inZone: false, reason: "out_of_zones", zones: allZones.map(zoneSummary) };
}

function zoneSummary(z) {
  return {
    id: z.id,
    name: z.name,
    delivery_cost: z.delivery_cost ?? null,
    delivery_days: Array.isArray(z.delivery_days) ? z.delivery_days : [],
    delivery_hours: z.delivery_hours || null,
    min_order_amount: z.min_order_amount ?? 0,
  };
}

/**
 * Formato compacto que ve el LLM en working_memory.store.delivery.zones[].
 * Sin polygon (no le sirve al modelo), sí con costos/días/horas.
 */
export function buildZonesForLLM(deliveryZones) {
  return getZones(deliveryZones).map(zoneSummary);
}

/**
 * Resumen humano para system/replies cuando el LLM lo necesita en prosa.
 * Ejemplo: "Centro ($1500, lun-sab 10-20h), Palermo ($2000, mar/jue 11-19h)".
 */
export function summarizeDeliveryZones(deliveryZones) {
  const zones = getZones(deliveryZones);
  if (!zones.length) return "";
  return zones.map((z) => {
    const cost = z.delivery_cost != null ? `$${Number(z.delivery_cost).toLocaleString("es-AR")}` : "";
    const days = formatDaysList(z.delivery_days);
    const hours = z.delivery_hours?.start && z.delivery_hours?.end
      ? `${z.delivery_hours.start.slice(0, 5)}-${z.delivery_hours.end.slice(0, 5)}h`
      : "";
    const tail = [cost, days, hours].filter(Boolean).join(" ");
    return tail ? `${z.name} (${tail})` : z.name;
  }).join(", ");
}

function formatDaysList(days) {
  if (!Array.isArray(days) || !days.length) return "";
  // Detectar rango consecutivo lun-sab etc.
  const idx = days.map((d) => DAY_KEYS_SHORT.indexOf(d)).filter((i) => i >= 0).sort((a, b) => a - b);
  if (idx.length >= 3) {
    const isContiguous = idx.every((v, i, arr) => i === 0 || v === arr[i - 1] + 1);
    if (isContiguous) return `${DAY_KEYS_SHORT[idx[0]]}-${DAY_KEYS_SHORT[idx[idx.length - 1]]}`;
  }
  return idx.map((i) => DAY_KEYS_SHORT[i]).join("/");
}

/**
 * Construye variables de contexto de tienda. El bot ya no usa templates de
 * texto, pero workingMemory sigue tomando algunos de estos campos.
 */
export function buildStoreContextVars(storeConfig = {}) {
  const dayKey = todayShortKey();
  const sched = storeConfig.schedule || {};

  const pickupSlot = pickDaySlot(sched.pickup, dayKey);
  const storeHoursToday = formatDaySlot(pickupSlot) || "";

  return {
    store_name: storeConfig.name || "",
    bot_name: storeConfig.botName || "",
    store_address: storeConfig.address || "",
    store_phone: storeConfig.phone || "",
    store_hours_today: storeHoursToday,
    pickup_hours_today: formatDaySlot(pickupSlot) || "",
    delivery_zones_summary: summarizeDeliveryZones(storeConfig.delivery_zones),
  };
}

export const __test__ = { todayShortKey, pickDaySlot, formatDaySlot, formatDaysList, DAY_NAMES };