feat: all UI components, MVP implementation

src/App.tsx

@@ -1,10 +1,12 @@
 import { useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { getPokemonByID } from "./api/pokemon";
-import { PokemonCard } from "./components/PokemonCard";
+import { PokemonCard } from "./components/PokemonCard/PokemonCard";
+import { Favorite } from "./components/Favorite/Favorite";
 
 export default function App() {
-  const [pokemonId, setPokemonId] = useState(Math.ceil(Math.random() * 493));
+  // Start at a default ID
+  const [pokemonId, setPokemonId] = useState(1);
 
   const query = useQuery({
     queryKey: ["pokemon", pokemonId],
@@ -19,6 +21,14 @@ export default function App() {
     setPokemonId((prev) => prev + 1);
   };
 
+  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const value = parseInt(e.target.value, 10);
+    // Ensure the user cannot enter negative numbers or invalid text
+    if (!isNaN(value) && value > 0) {
+      setPokemonId(value);
+    }
+  };
+
   return (
     <div
       style={{
@@ -28,16 +38,27 @@ export default function App() {
         gap: "16px",
       }}
     >
-      <div style={{ display: "flex", gap: "10px" }}>
+      <div style={{ display: "flex", gap: "10px", alignItems: "center" }}>
         <button onClick={handlePrevious} disabled={pokemonId <= 1}>
           &larr; Prev
         </button>
+
+        <input
+          type="number"
+          value={pokemonId}
+          onChange={handleInputChange}
+          min="1"
+          style={{ width: "70px", textAlign: "center", padding: "4px" }}
+          aria-label="Pokemon ID"
+        />
+
         <button onClick={handleNext}>Next &rarr;</button>
       </div>
 
       {query.isPending && <h1>Loading...</h1>}
       {query.isError && <h1>Failed to load Pokemon</h1>}
       {query.data && <PokemonCard pokemon={query.data} />}
+      <Favorite pokemonId={pokemonId} />
     </div>
   );
 }

src/components/Favorite/Favorite.css

@@ -0,0 +1,25 @@
+.favorite-button {
+  background: transparent;
+  border: none;
+  font-size: 1.5rem;
+  cursor: pointer;
+  padding: 0.5rem;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: transform 0.2s ease-in-out;
+}
+
+.favorite-button:hover {
+  transform: scale(1.2);
+}
+
+.favorite-button:focus-visible {
+  outline: 2px solid #0056b3;
+  outline-offset: 2px;
+}
+
+.favorite-button:active {
+  transform: scale(0.9);
+}

src/components/Favorite/Favorite.tsx

@@ -0,0 +1,46 @@
+import { useState } from "react";
+import "./Favorite.css";
+
+type FavoriteProps = {
+  pokemonId: number;
+};
+
+export function Favorite({ pokemonId }: FavoriteProps) {
+  // 1. Lazy initialization from localStorage
+  const [favorites, setFavorites] = useState<number[]>(() => {
+    try {
+      const storedFavorites = window.localStorage.getItem("favorites");
+      return storedFavorites ? JSON.parse(storedFavorites) : [];
+    } catch (error) {
+      console.error("Error reading localStorage", error);
+      return [];
+    }
+  });
+
+  const isFavorite = favorites.includes(pokemonId);
+
+  // 2. The click handler syncing State and Storage
+  const toggleFavorite = () => {
+    let updatedFavorites: number[];
+
+    if (isFavorite) {
+      updatedFavorites = favorites.filter((id) => id !== pokemonId);
+    } else {
+      updatedFavorites = [...favorites, pokemonId];
+    }
+
+    setFavorites(updatedFavorites);
+    window.localStorage.setItem("favorites", JSON.stringify(updatedFavorites));
+  };
+
+  // 3. Accessible UI rendering
+  return (
+    <button
+      onClick={toggleFavorite}
+      aria-label={isFavorite ? "Remove from favorites" : "Add to favorites"}
+      className="favorite-button"
+    >
+      {isFavorite ? "❤️" : "🤍"}
+    </button>
+  );
+}

src/components/FavoritePokemon/FavoritePokemon.css

@@ -0,0 +1,46 @@
+.favorite-container {
+  width: 100%;
+  max-width: 400px;
+  margin: 0 auto;
+}
+
+.favorite-list {
+  list-style-type: none;
+  padding: 0;
+  margin: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.favorite-item {
+  display: flex;
+  align-items: center;
+  background-color: #f8f9fa;
+  border: 1px solid #e0e0e0;
+  border-radius: 8px;
+  padding: 8px 16px;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+}
+
+.favorite-sprite {
+  width: 64px;
+  height: 64px;
+  margin-right: 16px;
+}
+
+.favorite-info {
+  display: flex;
+  flex-direction: column;
+}
+
+.dex-number {
+  font-size: 0.85rem;
+  color: #6c757d;
+}
+
+.pokemon-name {
+  font-size: 1.1rem;
+  font-weight: bold;
+  text-transform: capitalize;
+}

src/components/FavoritePokemon/FavoritePokemon.tsx

@@ -0,0 +1,68 @@
+import "./FavoritePokemon.css";
+
+type PokemonData = {
+  id: number;
+  name: string;
+  sprites: {
+    front_default: string;
+  };
+};
+
+type FavoritePokemonProps = {
+  pokemonList?: PokemonData[];
+};
+
+const DUMMY_DATA: PokemonData[] = [
+  {
+    id: 1,
+    name: "bulbasaur",
+    sprites: {
+      front_default:
+        "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/1.png",
+    },
+  },
+  {
+    id: 4,
+    name: "charmander",
+    sprites: {
+      front_default:
+        "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/4.png",
+    },
+  },
+  {
+    id: 25,
+    name: "pikachu",
+    sprites: {
+      front_default:
+        "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/25.png",
+    },
+  },
+];
+
+export function FavoritePokemon({ pokemonList }: FavoritePokemonProps) {
+  const listToRender =
+    pokemonList && pokemonList.length > 0 ? pokemonList : DUMMY_DATA;
+
+  return (
+    <div className="favorite-container">
+      <h2>My Favorites</h2>
+      <ul className="favorite-list">
+        {listToRender.map((pokemon) => (
+          <li key={pokemon.id} className="favorite-item">
+            <img
+              src={pokemon.sprites.front_default}
+              alt={pokemon.name}
+              className="favorite-sprite"
+            />
+            <div className="favorite-info">
+              <span className="dex-number">
+                #{pokemon.id.toString().padStart(3, "0")}
+              </span>
+              <span className="pokemon-name">{pokemon.name}</span>
+            </div>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

src/components/PokemonCard/PokemonCard.css

@@ -1,4 +1,4 @@
-div {
+.pokemon-card {
   display: flex;
   flex-direction: column;
   align-items: center;
@@ -9,38 +9,72 @@ div {
   background: #fff;
   border-radius: 8px;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+  margin: 0 auto;
+  max-width: 500px;
 }
 
-h1 {
+.pokemon-card h1 {
   text-align: center;
   margin-bottom: 10px;
 }
 
-img {
+.pokemon-card img {
   display: block;
   margin: 0 auto 20px auto;
   width: 120px;
   height: 120px;
 }
 
-table {
+.general-info {
+  width: 100%;
+  background: #f8f9fa;
+  padding: 16px;
+  border-radius: 8px;
+  margin-bottom: 24px;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.info-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 14px;
+}
+
+.type-badges {
+  display: flex;
+  gap: 6px;
+}
+
+.type-badge {
+  background: #333;
+  color: white;
+  padding: 2px 8px;
+  border-radius: 12px;
+  font-size: 12px;
+  text-transform: capitalize;
+}
+
+.stats-table {
   display: grid;
   grid-template-columns: auto auto 1fr auto auto;
   width: 100%;
   border-collapse: collapse;
 }
 
-tbody,
-tfoot,
-tr {
+.stats-table tbody,
+.stats-table tfoot,
+.stats-table tr {
   display: contents;
 }
 
-tr {
+.stats-table tr {
   border-bottom: 1px solid #eee;
 }
 
-th {
+.stats-table th {
   padding: 8px 4px;
   font-weight: normal;
   color: #666;
@@ -52,13 +86,13 @@ th {
   white-space: nowrap;
 }
 
-th.cell-num:nth-child(1) {
+.stats-table th.cell-num:nth-child(1) {
   text-align: left;
   color: #666;
   font-weight: 500;
 }
 
-th.cell-num:nth-child(2) {
+.stats-table th.cell-num:nth-child(2) {
   font-weight: bold;
   color: #333;
 }
@@ -79,31 +113,31 @@ th.cell-num:nth-child(2) {
   padding: 6px;
 }
 
-tfoot tr {
+.stats-table tfoot tr {
   border-bottom: none;
 }
 
-tfoot th {
+.stats-table tfoot th {
   color: #333;
   font-weight: bold !important;
 }
 
-tfoot th:nth-child(1) {
+.stats-table tfoot th:nth-child(1) {
   grid-column: 1;
   text-align: left;
 }
 
-tfoot th:nth-child(2) {
+.stats-table tfoot th:nth-child(2) {
   grid-column: 2;
   text-align: right;
 }
 
-tfoot th:nth-child(3) {
+.stats-table tfoot th:nth-child(3) {
   grid-column: 4;
   text-align: right;
 }
 
-tfoot th:nth-child(4) {
+.stats-table tfoot th:nth-child(4) {
   grid-column: 5;
   text-align: right;
 }