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import type { Cat } from "../../cat/cat.ts";
import React, { useEffect, useState } from "react";import { Link, useLocation } from "react-router-dom";
export default () => {  const [cats, setCats] = useState<Cat[]>([]);  const [id, setId] = useState(0);  const [name, setName] = useState("");  const [age, setAge] = useState(0);  const [] = useState([]);  const location = useLocation<{ username: string }>();  const username = location.state.username;
  useEffect(() => {    fetch("/cat").then((resp) => resp.json()).then((data) => {      if (data.length > 0) {        console.log(data);        setCats(data);      }    });  }, []);
  function add() {    fetch("/cat", {      method: "POST",      headers: {        "content-type": "application/json",      },      body: JSON.stringify({ name, age }),    }).then((resp) => resp.json()).then((data) => {      if (data.id) {        setCats([...cats, data]);      } else {        throw new Error();      }    }).catch(() => {      alert("failed");    });  }
  function del(id: number) {    fetch(`/cat/${id}`, {      method: "DELETE",    }).then((resp) => resp.json()).then((data) => {      if (data.affectedRows === 1) {        setCats(cats.filter((c) => c.id !== id));      }    });  }
  function update(id: number) {    const n = name;    const a = age;    fetch(`/cat/${id}`, {      method: "PUT",      headers: {        "content-type": "application/json",      },      body: JSON.stringify({ name: n, age: a }),    }).then((resp) => resp.json()).then((data) => {      if (data.affectedRows === 1) {        setCats(cats.map((c) => {          if (c.id === id) {            return { id: c.id, name: n, age: a };          }          return c;        }));      }    });  }
  return (    <>      Hello, {username}! <Link to="/login">Logout</Link>      <br />
      <table border="1">        <caption>Cats List</caption>        <thead>          <tr>            <th>ID</th>            <th>Name</th>            <th>Age</th>            <th>Action</th>          </tr>        </thead>        <tbody>          {cats.map((c) => (            <tr>              <td>{c.id}</td>              <td>{c.name}</td>              <td>{c.age}</td>              <td>                <button onClick={() => del(c.id!)}>Delete</button>              </td>            </tr>          ))}        </tbody>      </table>
      <label htmlFor="id">ID:</label>      <input        id="id"        type="number"        onChange={(e) => setId(Number(e.target.value))}      />      &nbsp;      <label htmlFor="name">Name:</label>      <input        id="name"        type="text"        autoComplete="off"        onChange={(e) => setName(e.target.value)}      />      &nbsp;      <label htmlFor="age">Age:</label>      <input        id="age"        type="number"        onChange={(e) => setAge(Number(e.target.value))}      />      &nbsp;      <button onClick={id ? () => update(id) : add}>Add/Update</button>    </>  );};