/// Copyright (c) 2020 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// This project and source code may use libraries or frameworks that are
/// released under various Open-Source licenses. Use of those libraries and
/// frameworks are governed by their own individual licenses.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import UIKit

class ChecklistViewController: UITableViewController, AddItemViewControllerDelegate {
  var items = [ChecklistItem]()

  override func viewDidLoad() {
    super.viewDidLoad()
    navigationController?.navigationBar.prefersLargeTitles = true
    let item1 = ChecklistItem()
    item1.text = "Walk the dog"
    items.append(item1)

    let item2 = ChecklistItem()
    item2.text = "Brush my teeth"
    item2.checked = true
    items.append(item2)

    let item3 = ChecklistItem()
    item3.text = "Learn iOS development"
    item3.checked = true
    items.append(item3)

    let item4 = ChecklistItem()
    item4.text = "Soccer practice"
    items.append(item4)

    let item5 = ChecklistItem()
    item5.text = "Eat ice cream"
    items.append(item5)
  }

  func configureCheckmark(for cell: UITableViewCell, with item: ChecklistItem) {
    if item.checked {
      cell.accessoryType = .checkmark
    } else {
      cell.accessoryType = .none
    }
  }

  func configureText(for cell: UITableViewCell, with item: ChecklistItem) {
    let label = cell.viewWithTag(1000) as! UILabel
    label.text = item.text
  }

  // MARK: - Navigation
  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "AddItem" {
      let controller = segue.destination as! AddItemViewController
      controller.delegate = self
    }
  }

  // MARK: - Table View Data Source
  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return items.count
  }

  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ->
  UITableViewCell {
    let cell = tableView.dequeueReusableCell(
      withIdentifier: "ChecklistItem",
      for: indexPath)

    let item = items[indexPath.row]
    configureText(for: cell, with: item)
    configureCheckmark(for: cell, with: item)
    return cell
  }

  // MARK: - Table View Delegate
  override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath) {
      let item = items[indexPath.row]
      item.checked.toggle()
      configureCheckmark(for: cell, with: item)
    }
    tableView.deselectRow(at: indexPath, animated: true)
  }

  override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
    items.remove(at: indexPath.row)

    let indexPaths = [indexPath]
    tableView.deleteRows(at: indexPaths, with: .automatic)
  }

  // MARK: - Add Item ViewController Delegates
  func addItemViewControllerDidCancel(_ controller: AddItemViewController) {
    navigationController?.popViewController(animated: true)
  }

  func addItemViewController(_ controller: AddItemViewController, didFinishAdding item: ChecklistItem) {
    let newRowIndex = items.count
    items.append(item)

    let indexPath = IndexPath(row: newRowIndex, section: 0)
    let indexPaths = [indexPath]
    tableView.insertRows(at: indexPaths, with: .automatic)

    navigationController?.popViewController(animated: true)
  }
}
