const { notifyUser } = require("./notifyUser");
const AcademyModel = require("../models/AcademyModel");

const LIKE_TITLE = "پست شما لایک شد";
const LIKE_DESCRIPTION = "پست شما لایک شد";

function normalizeId(value) {
  if (value == null) return null;
  if (typeof value === "object" && value._id) return String(value._id);
  return String(value);
}

/**
 * @param {object} params
 * @param {import('socket.io').Server} [params.io] بدون این، فقط توی دیتابیس ثبت می‌شه، نه سوکت/پوش زنده
 * @param {string|import('mongoose').Types.ObjectId} params.ownerId
 * @param {string|import('mongoose').Types.ObjectId} params.likerId
 * @param {string|import('mongoose').Types.ObjectId} params.entityId
 * @param {'post_like'|'academy_like'|'billboard_like'} [params.type]
 */
const createLikeNotification = async ({
  io,
  ownerId,
  likerId,
  entityId,
  type = "post_like",
}) => {
  try {
    const owner = normalizeId(ownerId);
    const liker = normalizeId(likerId);
    const entity = normalizeId(entityId);

    if (!owner || !liker || !entity) return;
    if (owner === liker) return;

    await notifyUser(io, owner, {
      type,
      title: LIKE_TITLE,
      description: LIKE_DESCRIPTION,
      project_post_id: entity,
      actor_id: liker,
    });
  } catch (error) {
    console.error("Error creating like notification:", error);
  }
};

const resolveCourseOwnerId = async (course) => {
  if (!course) return null;

  const directOwner = normalizeId(course.user_id);
  if (directOwner) return directOwner;

  if (course.academyId) {
    const academy = await AcademyModel.findById(course.academyId)
      .select("userId")
      .lean();
    const academyOwner = normalizeId(academy?.userId);
    if (academyOwner) return academyOwner;
  }

  return null;
};

const resolveAdvertisingOwnerId = (advertising) => {
  if (!advertising) return null;
  return normalizeId(advertising.creator_id);
};

module.exports = {
  createLikeNotification,
  resolveCourseOwnerId,
  resolveAdvertisingOwnerId,
};