import Ajv from "ajv";
import addFormats from "ajv-formats";

import db from "../../../lib/db";
import { withErrorHandling, withSession } from "../../../lib/apiHelpers";

const handler = withErrorHandling(
  withSession(async (req, res, session) => {
    const { method } = req;
    const { user } = session;

    switch (method) {
      case "GET":
        await getBookmarks(req, res, user);
        break;
      case "POST":
        await createBookmark(req, res, user);
        break;
      default:
        res.setHeader("Allow", ["GET", "POST"]);
        res.status(405).end(`Method ${method} Not Allowed`);
    }
  })
);

const ajv = new Ajv();
addFormats(ajv);

const getBookmarks = async (req, res, user) => {
  const params = {
    TableName: process.env.FMN_DYNAMODB_TABLENAME,
    KeyConditionExpression: "hk = :hk AND begins_with(sk, :sk)",
    ExpressionAttributeValues: {
      ":hk": `user#${user.sub}`,
      ":sk": "bookmark#",
    },
  };

  let bookmarks = await db.query(params).promise();
  res.status(200).json(bookmarks.Items);
};

const createBookmarkSchema = {
  type: "object",
  properties: {
    title: { type: "string" },
    url: { type: "string", format: "uri" },
  },
  required: ["title", "url"],
};

const validateCreateBookmarkSchema = ajv.compile(createBookmarkSchema);

const createBookmark = async (req, res, user) => {
  if (!validateCreateBookmarkSchema(req.body)) {
    console.warn(validateCreateBookmarkSchema.errors);
    res.status(400).json(validateCreateBookmarkSchema.errors);
    return;
  }

  const params = {
    TableName: process.env.FMN_DYNAMODB_TABLENAME,
    Item: {
      hk: `user#${user.sub}`,
      sk: `bookmark#${"abc"}`,
      title: req.body.title,
      url: req.body.url,
    },
  };

  await db.put(params).promise();
  res.status(200).json(params.Item);
};

export default handler;