const express = require("express");
const router = express.Router();
const pool = require("../../db");
const { strictInput } = require("../../middleware/strict_input");
const { areFriends } = require("../relations/friend_graph");
const { likeDataForPosts } = require("./post_graph");

async function getPostDetail(req, res) {
  try {
    const { id } = req.params;
    const postId = Number(id);
    if (!Number.isInteger(postId) || postId <= 0) {
      return res.status(400).send("Invalid post id");
    }
    const { rows } = await pool.query(
      `SELECT p.id, p.title, p.text, p.author_id, people.username AS author_username, p.image_link, p.created_at, people.private AS author_private
       FROM posts p
       LEFT JOIN people ON people.id = p.author_id
       WHERE p.id = $1 AND p.active = true`,
      [postId],
    );
    if (rows.length === 0) {
      return res.status(404).send("Post not found");
    }
    const post = rows[0];
    if (
      post.author_private &&
      Number(post.author_id) !== req.user.id &&
      !(await areFriends(req.user.id, post.author_id))
    ) {
      return res.status(404).send("Post not found");
    }
    const { author_private, ...publicPost } = post;
    const likeData = (await likeDataForPosts(req.user.id, [post.id])).get(
      Number(post.id),
    ) ?? { like_count: 0, liked_by_me: false };
    return res
      .status(200)
      .json({
        ...publicPost,
        comments: [],
        like_count: likeData.like_count,
        liked_by_me: likeData.liked_by_me,
      });
  } catch (err) {
    console.error("post detail query failed", {
      message: err.message,
      code: err.code,
      detail: err.detail,
      hint: err.hint,
    });
    return res.status(500).send("Post could not be retrieved, request failed");
  }
}

router.get("/:id", strictInput(), getPostDetail);

module.exports = router;