const express = require("express");
const router = express.Router();
const pool = require("../../db");
const { strictInput } = require("../../middleware/strict_input");
const { authenticateToken } = require("../../middleware/authenticate_token");
const {
  handlePostUpload,
  imageLinkForFile,
  removeUploadedFile,
} = require("../../middleware/post_upload");
const driver = require("../../graph_db");

async function create_post(req, res) {
  try {
    const { title, text } = req.body;
    const author_id = req.user.id;
    if (!title || !text) {
      await removeUploadedFile(req.file);
      return res.status(400).send("Title or text was not provided");
    } else {
      const imageLink = imageLinkForFile(req.file);
      try {
        const { rows } = await pool.query(
          "WITH created AS (INSERT INTO posts (title, text, author_id, image_link) VALUES ($1, $2, $3, $4) RETURNING id, title, text, author_id, image_link, created_at) SELECT created.*, people.username AS author_username FROM created LEFT JOIN people ON people.id = created.author_id",
          [title, text, author_id, imageLink],
        );
        const post = rows[0];
        try {
          await driver.executeQuery(
            "CREATE (p:Post {db_id: $db_id, author_id: $author_id, created_at: datetime()})",
            { db_id: Number(post.id), author_id: Number(post.author_id) },
            { database: process.env.GRAPH_DB_NAME },
          );
        } catch (graphErr) {
          await pool.query("DELETE FROM posts WHERE id = $1", [post.id]).catch(() => {});
          throw graphErr;
        }
        res.status(201).json({
          ...post,
          like_count: 0,
          liked_by_me: false,
        });
      } catch (err) {
        await removeUploadedFile(req.file);
        throw err;
      }
    }
  } catch (err) {
    console.error("database query failed", {
      message: err.message,
      code: err.code,
      detail: err.detail,
      hint: err.hint,
      stack: err.stack,
    });
    res.status(500).send("Data was not pushed, request failed");
  }
}

router.post(
  "/",
  authenticateToken,
  handlePostUpload,
  strictInput({ body: ["title", "text"], cleanupUploadedFile: true }),
  create_post,
);
module.exports = router;