// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import type { NextApiRequest, NextApiResponse } from "next";
import { store as storeProxy } from "@/store";
import config from "@/config";

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  const store = storeProxy.get();
  // console.log("api::store.null()", store);
  if (req.method === "POST") {
    if (!config.begin) {
      res.status(400).json({
        error: "还没到开始时间哦",
      });
      return;
    }
    const json = req.body;
    console.log("api::request: new request", json);
    if (json.checked) {
      let count = 0;
      for (const name in store) {
        if (store[name] == json.user) {
          count += 1;
          if (count >= config.limit) {
            res.status(403).json({
              error: `超过选择数量限制，您至多选 ${config.limit} 个班次`,
            });
            return;
          }
        }
      }
      // check whether the user repeatly select
      if (store[json.name] === json.user) {
        console.log("api::request: repeat select", json);
        res.status(403).json({
          error: `您已经选择了这个班次，请勿重复选择`,
        });
        return;
      }
      // check whether it is already occupied
      else if (store[json.name] !== undefined) {
        console.log("api::request: occupied", json);
        res.status(403).json({
          error: `当前位置已被他人占用，请选择其他班次`,
        });
        return;
      }
      store[json.name] = json.user;
    } else {
      // console.log(store, json);
      // check whether the request name match the taken name
      if (store[json.name] !== json.user) {
        res.status(403).json({
          error: `您已经取消了这个班次，请勿重复点击复选框`,
        })
        return;
      }
      delete store[json.name];
    }
  }
  const resp: { occupied: string[], myselect: string[] } = { // try to fix
    occupied: [],
    myselect: [],
  };
  for (const key in store) {
    if (store[key] !== req.query.name) {
      resp.occupied.push(key);
    } else {
      resp.myselect.push(key);
    }
  }
  res.status(200).json(resp);
}