Challenge 2: Click Handling — Solution

class ProductAdapter(
    private val products: List<Product>,
    private val onProductClick: (Product) -> Unit
) : RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {

    class ProductViewHolder(val binding: ItemProductBinding) :
        RecyclerView.ViewHolder(binding.root)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProductViewHolder {
        val binding = ItemProductBinding.inflate(
            LayoutInflater.from(parent.context), parent, false
        )
        return ProductViewHolder(binding)
    }

    override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
        val product = products[position]
        holder.binding.nameText.text = product.name
        holder.binding.priceText.text = "$${product.price}"
        holder.binding.root.setOnClickListener {
            onProductClick(product)
        }
    }

    override fun getItemCount() = products.size
}

// MainActivity.kt — inside onCreate
binding.recyclerView.layoutManager = LinearLayoutManager(this)
binding.recyclerView.adapter = ProductAdapter(products) { clickedProduct ->
    Log.d("MainActivity", "Clicked: ${clickedProduct.name}")
}

Notes:
- onProductClick is stored as a constructor property, so every
  ViewHolder's click listener (set inside onBindViewHolder) can call it
  with that specific row's product.
- holder.binding.root refers to the entire item layout's root View —
  making the whole row clickable, not just one piece of text inside it.
- Because "product" is captured inside the lambda passed to
  setOnClickListener, clicking any row correctly reports THAT row's
  product, even though the same click-listener-setting code runs
  identically for every row.