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ProductListPresenter.kt
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ProductListPresenter.kt
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package woowacourse.shopping.view.productlist
import woowacourse.shopping.domain.model.Product
import woowacourse.shopping.domain.pagination.ProductListPagination
import woowacourse.shopping.domain.repository.CartRepository
import woowacourse.shopping.domain.repository.ProductRepository
import woowacourse.shopping.domain.repository.RecentViewedRepository
import woowacourse.shopping.model.ProductModel
import woowacourse.shopping.model.toUiModel
class ProductListPresenter(
private val view: ProductListContract.View,
private val productRepository: ProductRepository,
private val recentViewedRepository: RecentViewedRepository,
private val cartRepository: CartRepository,
) : ProductListContract.Presenter {
private val productListPagination = ProductListPagination(PAGINATION_SIZE, productRepository)
private val productsListItems = mutableListOf<ProductListViewItem>()
override fun fetchProducts() {
// 최근 본 항목
val viewedItems = recentViewedRepository.findAll().reversed()
if (viewedItems.isNotEmpty()) addViewedProductsItem(viewedItems)
// 상품 리스트
val currentProducts = productListPagination.nextItems()
addProductsItem(convertProductsToModels(currentProducts))
// 더보기
if (productListPagination.isNextEnabled) productsListItems.add(ProductListViewItem.ShowMoreItem())
view.showProducts(productsListItems)
}
private fun addViewedProductsItem(ids: List<Int>) {
val viewedProductsModel = ids.map { convertIdToProductModel(it) }
productsListItems.add(ProductListViewItem.RecentViewedItem(viewedProductsModel))
}
private fun addProductsItem(products: List<ProductModel>) {
productsListItems.addAll(products.map { ProductListViewItem.ProductItem(it) })
}
override fun showProductDetail(product: ProductModel) {
val recentViewedItem =
productsListItems.filterIsInstance<ProductListViewItem.RecentViewedItem>().getOrNull(0)
var lastViewedProduct: ProductModel? = null
if (recentViewedItem != null) {
lastViewedProduct = recentViewedItem.products[0]
}
view.onClickProductDetail(product, lastViewedProduct)
}
override fun loadMoreProducts() {
val recentViewedItemSize =
productsListItems.filterIsInstance<ProductListViewItem.RecentViewedItem>().size
val productsItemSize =
productsListItems.filterIsInstance<ProductListViewItem.ProductItem>().size
val mark = productsItemSize + recentViewedItemSize
val nextProducts = convertProductsToModels(productListPagination.nextItems())
// RecyclerView Items 수정
productsListItems.removeLast()
addProductsItem(nextProducts)
if (productListPagination.isNextEnabled) productsListItems.add(ProductListViewItem.ShowMoreItem())
// Notify
view.notifyAddProducts(mark, PAGINATION_SIZE)
}
override fun addToCartProducts(id: Int, count: Int) {
cartRepository.add(id, count)
fetchProductCount(id)
}
override fun updateCartProductCount(id: Int, count: Int) {
if (count == 0) {
cartRepository.remove(id)
fetchProductCount(id)
fetchCartCount()
return
}
cartRepository.update(id, count)
fetchProductCount(id)
}
override fun fetchCartCount() {
view.showCartCount(cartRepository.findAll().size)
}
override fun fetchProductCounts() {
val cartProducts = cartRepository.findAll()
val itemsHaveCount = productsListItems
.asSequence()
.filterIsInstance<ProductListViewItem.ProductItem>()
.filter { it.product.count > 0 }
.toList()
itemsHaveCount.forEach { item ->
val cartProduct = cartProducts.find { it.id == item.product.id }
val index = productsListItems.indexOf(item)
val listItem = productsListItems[index] as ProductListViewItem.ProductItem
productsListItems[index] = ProductListViewItem.ProductItem(
listItem.product.copy(count = cartProduct?.count ?: 0),
)
view.notifyDataChanged(index)
}
}
override fun fetchProductCount(id: Int) {
if (id == -1) return
val product = cartRepository.find(id)
val index =
productsListItems.indexOfFirst { it is ProductListViewItem.ProductItem && it.product.id == id }
val item = productsListItems[index] as ProductListViewItem.ProductItem
productsListItems[index] =
ProductListViewItem.ProductItem(item.product.copy(count = product?.count ?: 0))
view.notifyDataChanged(index)
}
override fun updateRecentViewed(id: Int) {
if (id == -1) return
if (isExistRecentViewed()) productsListItems.removeIf { it is ProductListViewItem.RecentViewedItem }
val viewedProductModels =
convertIdsToProductModels(recentViewedRepository.findAll()).reversed()
productsListItems.add(0, ProductListViewItem.RecentViewedItem(viewedProductModels))
view.notifyRecentViewedChanged()
}
private fun convertIdToProductModel(id: Int) =
productRepository.find(id).toUiModel(cartRepository.find(id)?.count ?: 0)
private fun convertIdsToProductModels(ids: List<Int>) = ids.map { convertIdToProductModel(it) }
private fun convertProductToModel(product: Product) =
product.toUiModel(cartRepository.find(product.id)?.count ?: 0)
private fun convertProductsToModels(products: List<Product>) =
products.map { convertProductToModel(it) }
private fun isExistRecentViewed(): Boolean =
productsListItems[0] is ProductListViewItem.RecentViewedItem
companion object {
private const val PAGINATION_SIZE = 20
}
}