// Copyright © 2020 Metabolist. All rights reserved.

import UIKit
import ViewModels

class TableViewDataSource: UITableViewDiffableDataSource<Int, CollectionItemIdentifier> {
    private let updateQueue =
        DispatchQueue(label: "com.metabolist.metatext.collection-data-source.update-queue")

    init(tableView: UITableView, viewModelProvider: @escaping (IndexPath) -> CollectionItemViewModel) {
        for kind in CollectionItemIdentifier.Kind.allCases {
            tableView.register(kind.cellClass, forCellReuseIdentifier: String(describing: kind.cellClass))
        }

        super.init(tableView: tableView) { tableView, indexPath, identifier in
            let cell = tableView.dequeueReusableCell(
                withIdentifier: String(describing: identifier.kind.cellClass),
                for: indexPath)

            switch (cell, viewModelProvider(indexPath)) {
            case let (statusListCell as StatusListCell, statusViewModel as StatusViewModel):
                statusListCell.viewModel = statusViewModel
            case let (accountListCell as AccountListCell, accountViewModel as AccountViewModel):
                accountListCell.viewModel = accountViewModel
            case let (loadMoreCell as LoadMoreCell, loadMoreViewModel as LoadMoreViewModel):
                loadMoreCell.viewModel = loadMoreViewModel
            default:
                break
            }

            return cell
        }
    }
}