// controllers/client/advertisements.controller.js

const Advertisement = require("../../models/advertisements/advertisements.mdl");
const mdl_Assets = require("../../models/assets/assets.mdl");
const R = require('../../utils/response.util');

const { Op } = require('sequelize');

const ALLOWED_TYPES = ["hero", "banner", "popup", "sidebar"];

// ─── Status derivation ─────────────────────────────────────────────────────
// Mirrors admin controller's deriveStatus — single source of truth for what
// "live right now" means. Kept duplicated rather than shared to avoid a
// cross-boundary import between admin and client controllers.
function deriveStatus(advertisement) {
  if (advertisement.deletedAt) return "archived";
  if (!advertisement.is_active) return "draft";

  const now   = new Date();
  const start = advertisement.start_date ? new Date(advertisement.start_date) : null;
  const end   = advertisement.end_date   ? new Date(advertisement.end_date)   : null;

  if (end && end < now) return "expired";
  if (start && start > now) return "scheduled";
  return "active";
}

// ─── GET ACTIVE ───────────────────────────────────────────────────────────────
//
// Resolves the single highest-priority live advertisement for a given placement
// type. "Live" means is_active = true AND within start_date/end_date window —
// computed the same way as deriveStatus, but expressed as a SQL WHERE clause
// here since we want the DB to do the filtering/ordering, not JS.
//
// GET /api/client/advertisements/active?type=hero
//
exports.getActiveAdvertisement = async (req, res) => {
  try {
    const { type } = req.query;

    if (!type) return R.error(res, "type is required.", 400);
    if (!ALLOWED_TYPES.includes(type)) return R.error(res, `Invalid type. Must be one of: ${ALLOWED_TYPES.join(", ")}`, 400);

    const now = new Date();

    const advertisement = await Advertisement.findOne({
      where: {
        type,
        is_active: true,
        deletedAt: null,
        [Op.and]: [
          { [Op.or]: [{ start_date: null }, { start_date: { [Op.lte]: now } }] },
          { [Op.or]: [{ end_date: null },   { end_date:   { [Op.gte]: now } }] },
        ],
      },
      order: [["order", "ASC"], ["createdAt", "DESC"]],
      include: [{
        model:     mdl_Assets,
        as:        "image",
        attributes: ["asset_id", "display_name", "file_url", "thumbnail_url"],
        required:  false,
      }],
      attributes: { exclude: ["createdBy", "updatedBy", "deletedBy", "deletedAt", "image_asset_id"] },
    });

    if (!advertisement) return R.success(res, "No active advertisement for this placement.", { data: null });

    const json = advertisement.toJSON();
    json.status = deriveStatus(json); // will always be "active" given the WHERE clause, but kept for shape consistency

    return R.success(res, "Active advertisement retrieved.", { data: json });
  } catch (err) {
    console.error("[CLIENT][ADVERTISEMENT][GET ACTIVE]", err);
    return R.error(res, "Could not retrieve advertisement.", 500);
  }
};

// ─── TRACK CLICK ──────────────────────────────────────────────────────────────
//
// POST /api/client/advertisements/:advertisementId/click
// Fire-and-forget increment. Never blocks or surfaces errors to the user —
// a failed click tracking call should never disrupt navigation to the CTA link.
//
exports.trackClick = async (req, res) => {
  try {
    const { advertisementId } = req.params;
    if (!advertisementId || advertisementId === "undefined") return R.error(res, "Invalid advertisement ID.", 400);

    const advertisement = await Advertisement.findOne({ where: { advertisement_id: advertisementId, deletedAt: null } });
    if (!advertisement) return R.success(res, "Advertisement not found, skipped.", { data: null });

    await advertisement.increment("click_count");

    return R.success(res, "Click tracked.", { data: { click_count: advertisement.click_count + 1 } });
  } catch (err) {
    console.error("[CLIENT][ADVERTISEMENT][TRACK CLICK]", err);
    // Still respond 200-ish/success shape — click tracking failures shouldn't surface to the user.
    return R.success(res, "Click tracking failed silently.", { data: null });
  }
};