import { pool } from "../../shared/db/pool.js";

// ─────────────────────────────────────────────────────────────
// Tenant Settings - CRUD
// ─────────────────────────────────────────────────────────────
//
// Modelo actual:
//  - Datos del comercio: store_name, bot_name, store_address, store_phone.
//  - Pickup (retiro en tienda): pickup_enabled + pickup_days CSV +
//    pickup_hours_start/end TIME, y `schedule.pickup` JSONB para horario por día.
//  - Delivery: TODO vive en `delivery_zones.zones[]` (polígonos GeoJSON con
//    costo, días y rango horario por zona). El bot valida zona usando la
//    ubicación que el cliente comparte por WhatsApp.

export async function getSettings({ tenantId }) {
  const sql = `
    SELECT
      id, tenant_id,
      store_name, bot_name, store_address, store_phone,
      pickup_enabled, pickup_days,
      pickup_hours_start::text as pickup_hours_start,
      pickup_hours_end::text as pickup_hours_end,
      schedule,
      delivery_zones,
      created_at, updated_at
    FROM tenant_settings
    WHERE tenant_id = $1
    LIMIT 1
  `;
  const { rows } = await pool.query(sql, [tenantId]);
  return rows[0] || null;
}

export async function upsertSettings({ tenantId, settings }) {
  const {
    store_name,
    bot_name,
    store_address,
    store_phone,
    pickup_enabled,
    pickup_days,
    pickup_hours_start,
    pickup_hours_end,
    schedule,
    delivery_zones,
  } = settings;

  const sql = `
    INSERT INTO tenant_settings (
      tenant_id, store_name, bot_name, store_address, store_phone,
      pickup_enabled, pickup_days, pickup_hours_start, pickup_hours_end,
      schedule, delivery_zones
    )
    VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
    ON CONFLICT (tenant_id) DO UPDATE SET
      store_name = COALESCE(EXCLUDED.store_name, tenant_settings.store_name),
      bot_name = COALESCE(EXCLUDED.bot_name, tenant_settings.bot_name),
      store_address = COALESCE(EXCLUDED.store_address, tenant_settings.store_address),
      store_phone = COALESCE(EXCLUDED.store_phone, tenant_settings.store_phone),
      pickup_enabled = COALESCE(EXCLUDED.pickup_enabled, tenant_settings.pickup_enabled),
      pickup_days = COALESCE(EXCLUDED.pickup_days, tenant_settings.pickup_days),
      pickup_hours_start = COALESCE(EXCLUDED.pickup_hours_start, tenant_settings.pickup_hours_start),
      pickup_hours_end = COALESCE(EXCLUDED.pickup_hours_end, tenant_settings.pickup_hours_end),
      schedule = COALESCE(EXCLUDED.schedule, tenant_settings.schedule),
      delivery_zones = COALESCE(EXCLUDED.delivery_zones, tenant_settings.delivery_zones),
      updated_at = NOW()
    RETURNING
      id, tenant_id,
      store_name, bot_name, store_address, store_phone,
      pickup_enabled, pickup_days,
      pickup_hours_start::text as pickup_hours_start,
      pickup_hours_end::text as pickup_hours_end,
      schedule,
      delivery_zones,
      created_at, updated_at
  `;

  const params = [
    tenantId,
    store_name || null,
    bot_name || null,
    store_address || null,
    store_phone || null,
    pickup_enabled ?? null,
    pickup_days || null,
    pickup_hours_start || null,
    pickup_hours_end || null,
    schedule ? JSON.stringify(schedule) : null,
    delivery_zones ? JSON.stringify(delivery_zones) : null,
  ];

  const { rows } = await pool.query(sql, params);
  return rows[0];
}

/**
 * Formatea schedule.pickup ({ lun: { start, end } }) en prosa para mostrar al
 * cliente. Agrupa días con mismos horarios: "Lun a Vie de 9 a 14hs".
 */
function formatScheduleHours(scheduleObj, enabled) {
  if (!enabled || !scheduleObj || typeof scheduleObj !== "object") {
    return enabled === false ? "No disponible" : "";
  }

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

  const groups = {};
  for (const day of dayOrder) {
    const slot = scheduleObj[day];
    if (!slot || !slot.start || !slot.end) continue;
    const key = `${slot.start}-${slot.end}`;
    if (!groups[key]) groups[key] = { start: slot.start, end: slot.end, days: [] };
    groups[key].days.push(day);
  }

  if (!Object.keys(groups).length) return "";

  const parts = Object.values(groups).map((g) => {
    const days = g.days;
    let dayStr;
    if (days.length >= 3) {
      const indices = days.map((d) => dayOrder.indexOf(d));
      const isConsecutive = indices.every((v, i, arr) => i === 0 || v === arr[i - 1] + 1);
      dayStr = isConsecutive
        ? `${dayNames[days[0]]} a ${dayNames[days[days.length - 1]]}`
        : days.map((d) => dayNames[d]).join(", ");
    } else if (days.length === 2) {
      dayStr = `${dayNames[days[0]]} y ${dayNames[days[1]]}`;
    } else {
      dayStr = dayNames[days[0]];
    }
    return `${dayStr} de ${g.start.slice(0, 5)} a ${g.end.slice(0, 5)}`;
  });

  return parts.join(", ");
}

function formatLegacyPickupHours(enabled, days, start, end) {
  if (!enabled) return "No disponible";
  if (!days || !start || !end) return "";
  const daysFormatted = days.split(",").map((d) => d.trim()).join(", ");
  return `${daysFormatted} de ${start.slice(0, 5)} a ${end.slice(0, 5)}`;
}

/**
 * Forma de la storeConfig que consume el agente y su workingMemory.
 */
export async function getStoreConfig({ tenantId }) {
  const settings = await getSettings({ tenantId });

  if (!settings) {
    return {
      name: "la carnicería",
      botName: "Piaf",
      hours: "",
      address: "",
      phone: "",
      pickupHours: "",
      schedule: null,
      delivery_zones: {},
    };
  }

  const schedule = settings.schedule || {};

  const pickupHours = schedule.pickup && Object.keys(schedule.pickup).length
    ? formatScheduleHours(schedule.pickup, settings.pickup_enabled)
    : formatLegacyPickupHours(
        settings.pickup_enabled,
        settings.pickup_days,
        settings.pickup_hours_start,
        settings.pickup_hours_end,
      );

  return {
    name: settings.store_name || "la carnicería",
    botName: settings.bot_name || "Piaf",
    hours: settings.pickup_enabled ? pickupHours : "",
    address: settings.store_address || "",
    phone: settings.store_phone || "",
    pickupHours,
    pickupEnabled: settings.pickup_enabled,
    schedule,
    delivery_zones: settings.delivery_zones || {},
  };
}