import TISwiftUtils
import Foundation

open class DefaultCollectionViewModel<ItemViewModel> {
    public typealias SelectItemHandlerPayload = (itemViewModel: ItemViewModel, indexPath: IndexPath)

    public var items: [ItemViewModel]
    public var selectItemHandler: ParameterClosure<SelectItemHandlerPayload>?

    public init(items: [ItemViewModel],
                selectItemHandler: ParameterClosure<SelectItemHandlerPayload>? = nil) {

        self.items = items
        self.selectItemHandler = selectItemHandler
    }

    open func numberOfSections() -> Int {
        1
    }

    open func numberOfItems(inSection section: Int) -> Int {
        items.count
    }

    open func itemViewModel(at indexPath: IndexPath) -> ItemViewModel {
        items[indexPath.row]
    }

    open func didSelectItem(at indexPath: IndexPath) {
        selectItemHandler?(SelectItemHandlerPayload(itemViewModel(at: indexPath), indexPath))
    }
}