server.js

const http = require("http");
const path = require("path");
const { URL } = require("url");
const { loadBoard, createColumn, deleteColumn, addCard, moveCard, updateCard, deleteCard } = require("./src/store");
const { serveStatic, sendJson, readJsonBody } = require("./src/http");

const publicDir = path.join(__dirname, "public");

function parseIdFromPath(pathname, prefix) {
  if (!pathname.startsWith(prefix)) {
    return null;
  }

  return pathname.slice(prefix.length);
}

const server = http.createServer(async (req, res) => {
  const url = new URL(req.url, `http://${req.headers.host}`);
  const { pathname } = url;

  try {
    if (req.method === "GET" && pathname === "/api/board") {
      const board = await loadBoard();
      return sendJson(res, 200, board);
    }

    if (req.method === "POST" && pathname === "/api/columns") {
      const body = await readJsonBody(req);
      const board = await createColumn(body.title);
      return sendJson(res, 201, board);
    }

    if (req.method === "DELETE") {
      const columnId = parseIdFromPath(pathname, "/api/columns/");
      if (columnId) {
        const board = await deleteColumn(columnId);
        return sendJson(res, 200, board);
      }
    }

    if (req.method === "POST" && pathname === "/api/cards") {
      const body = await readJsonBody(req);
      const board = await addCard(body.columnId, body.title, body.description || "");
      return sendJson(res, 201, board);
    }

    if (req.method === "PATCH" && pathname === "/api/cards/move") {
      const body = await readJsonBody(req);
      const board = await moveCard(body.cardId, body.toColumnId, body.toIndex);
      return sendJson(res, 200, board);
    }

    if (req.method === "PATCH") {
      const cardId = parseIdFromPath(pathname, "/api/cards/");
      if (cardId) {
        const body = await readJsonBody(req);
        const board = await updateCard(cardId, body);
        return sendJson(res, 200, board);
      }
    }

    if (req.method === "DELETE") {
      const cardId = parseIdFromPath(pathname, "/api/cards/");
      if (cardId) {
        const board = await deleteCard(cardId);
        return sendJson(res, 200, board);
      }
    }

    if (req.method === "GET" && pathname === "/favicon.ico") {
      res.writeHead(204);
      res.end();
      return;
    }

    if (req.method === "GET" && pathname === "/") {
      await serveStatic(res, publicDir, "index.html");
      return;
    }

    if (req.method === "GET") {
      await serveStatic(res, publicDir, pathname);
      return;
    }

    return sendJson(res, 404, { error: "Not found" });
  } catch (error) {
    const status = error.statusCode || 500;
    return sendJson(res, status, { error: error.message || "Internal server error" });
  }
});

const port = process.env.PORT || 3000;
server.listen(port, () => {
  console.log(`Kanban board is running on http://localhost:${port}`);
});