import { getSettings, upsertSettings, getStoreConfig } from "../db/settingsRepo.js";

const VALID_DAYS = ["lun", "mar", "mie", "jue", "vie", "sab", "dom"];

function defaultPickupSchedule() {
  const days = ["lun", "mar", "mie", "jue", "vie", "sab"];
  const pickup = {};
  for (const d of days) pickup[d] = { start: "08:00", end: "20:00" };
  return { pickup };
}

export async function handleGetSettings({ tenantId }) {
  const settings = await getSettings({ tenantId });

  if (!settings) {
    return {
      store_name: "Mi Negocio",
      bot_name: "Piaf",
      store_address: "",
      store_phone: "",
      pickup_enabled: true,
      pickup_days: "lun,mar,mie,jue,vie,sab",
      pickup_hours_start: "08:00",
      pickup_hours_end: "20:00",
      schedule: defaultPickupSchedule(),
      delivery_zones: {},
      is_default: true,
    };
  }

  // Si schedule está vacío pero tenemos los campos legacy de pickup, generar
  // schedule.pickup para que la UI pueda editar el grid por día.
  let schedule = settings.schedule;
  if (!schedule || !schedule.pickup || !Object.keys(schedule.pickup).length) {
    schedule = buildPickupScheduleFromLegacy(settings);
  }

  return {
    ...settings,
    pickup_hours_start: settings.pickup_hours_start?.slice(0, 5) || "08:00",
    pickup_hours_end: settings.pickup_hours_end?.slice(0, 5) || "20:00",
    schedule,
    delivery_zones: settings.delivery_zones || {},
    is_default: false,
  };
}

function buildPickupScheduleFromLegacy(settings) {
  const out = { pickup: {} };
  if (settings?.pickup_enabled && settings?.pickup_days) {
    const days = settings.pickup_days.split(",").map((d) => d.trim());
    const start = settings.pickup_hours_start?.slice(0, 5) || "08:00";
    const end = settings.pickup_hours_end?.slice(0, 5) || "20:00";
    for (const day of days) {
      if (VALID_DAYS.includes(day)) out.pickup[day] = { start, end };
    }
  }
  return out;
}

function validateSchedule(schedule) {
  if (!schedule || typeof schedule !== "object") return;
  const timeRegex = /^([01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$/;
  const pickup = schedule.pickup;
  if (!pickup || typeof pickup !== "object") return;
  for (const [day, slot] of Object.entries(pickup)) {
    if (!VALID_DAYS.includes(day)) throw new Error(`Invalid day in schedule.pickup: ${day}`);
    if (slot === null) continue;
    if (typeof slot !== "object" || !slot.start || !slot.end) {
      throw new Error(`Invalid slot format for pickup.${day}`);
    }
    if (!timeRegex.test(slot.start)) throw new Error(`Invalid start time for pickup.${day}: ${slot.start}`);
    if (!timeRegex.test(slot.end)) throw new Error(`Invalid end time for pickup.${day}: ${slot.end}`);
  }
}

function syncPickupLegacyFromSchedule(settings) {
  const pickup = settings?.schedule?.pickup;
  if (!pickup) return;
  const days = Object.keys(pickup).filter((d) => pickup[d] && pickup[d].start && pickup[d].end);
  days.sort((a, b) => VALID_DAYS.indexOf(a) - VALID_DAYS.indexOf(b));
  if (days.length) {
    settings.pickup_days = days.join(",");
    const first = pickup[days[0]];
    settings.pickup_hours_start = first.start;
    settings.pickup_hours_end = first.end;
  } else {
    settings.pickup_days = "";
  }
}

function validateDeliveryZones(dz) {
  if (!dz || typeof dz !== "object") return;
  if (dz.zones && !Array.isArray(dz.zones)) {
    throw new Error("delivery_zones.zones must be an array");
  }
  for (const z of dz.zones || []) {
    if (!z?.id || !z?.name) throw new Error("Each zone needs id + name");
    if (z.polygon && (z.polygon.type !== "Polygon" || !Array.isArray(z.polygon.coordinates))) {
      throw new Error(`Invalid polygon GeoJSON for zone ${z.id}`);
    }
    if (Array.isArray(z.delivery_days)) {
      for (const d of z.delivery_days) {
        if (!VALID_DAYS.includes(d)) throw new Error(`Invalid delivery day in zone ${z.id}: ${d}`);
      }
    }
  }
}

export async function handleSaveSettings({ tenantId, settings }) {
  if (!settings.store_name?.trim()) throw new Error("store_name is required");
  if (!settings.bot_name?.trim()) throw new Error("bot_name is required");

  if (settings.schedule) {
    validateSchedule(settings.schedule);
    syncPickupLegacyFromSchedule(settings);
  }

  if (settings.delivery_zones) {
    validateDeliveryZones(settings.delivery_zones);
  }

  if (settings.pickup_days) {
    const days = settings.pickup_days.split(",").map((d) => d.trim().toLowerCase());
    for (const d of days) {
      if (!VALID_DAYS.includes(d)) throw new Error(`Invalid pickup day: ${d}`);
    }
    settings.pickup_days = days.join(",");
  }

  const timeRegex = /^([01]?[0-9]|2[0-3]):[0-5][0-9]$/;
  if (settings.pickup_hours_start && !timeRegex.test(settings.pickup_hours_start)) {
    throw new Error("Invalid pickup_hours_start format (use HH:MM)");
  }
  if (settings.pickup_hours_end && !timeRegex.test(settings.pickup_hours_end)) {
    throw new Error("Invalid pickup_hours_end format (use HH:MM)");
  }

  const result = await upsertSettings({ tenantId, settings });

  return {
    ok: true,
    settings: {
      ...result,
      pickup_hours_start: result.pickup_hours_start?.slice(0, 5),
      pickup_hours_end: result.pickup_hours_end?.slice(0, 5),
      delivery_zones: result.delivery_zones || {},
    },
    message: "Configuración guardada correctamente",
  };
}

export async function handleGetStoreConfig({ tenantId }) {
  return await getStoreConfig({ tenantId });
}