//
//  SortController.swift
//  CapCollector
//
//  Created by Christoph on 12.11.18.
//  Copyright © 2018 CH. All rights reserved.
//

import UIKit

enum SortCriteria: Int {
    case id = 0
    case name = 1
    case count = 2
    case match = 3
    
    var text: String {
        switch self {
        case .id:
            return "Id"
        case .name:
            return "Name"
        case .count:
            return "Count"
        case .match:
            return "Match"
        }
    }
}

protocol SortControllerDelegate: AnyObject {

    func sortController(didSelect sortType: SortCriteria, ascending: Bool)
}

class SortController: UITableViewController {
    
    @IBOutlet weak var thirdRowLabel: UILabel!
    
    var selected: SortCriteria = .id
    
    var ascending: Bool = false
    
    weak var delegate: SortControllerDelegate?
    
    var options = [SortCriteria]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        preferredContentSize = CGSize(width: 200, height: 139 + options.count * 40)
    }

    private func giveFeedback(_ style: UIImpactFeedbackGenerator.FeedbackStyle) {
        UIImpactFeedbackGenerator(style: style).impactOccurred()
    }
    
    private func sortCriteria(for index: Int) -> SortCriteria {
        index < options.count ? options[index] : .match
    }

    // MARK: - Table view data source
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 2
    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        section == 0 ? "Sort order" : "Sort by"
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        section == 0 ? 1 : options.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "SortCell")!
        
        guard indexPath.section != 0 else {
            cell.accessoryType = ascending ? .checkmark : .none
            cell.textLabel?.text = "Ascending"
            return cell
        }
        let select = sortCriteria(for: indexPath.row)
        cell.textLabel?.text = select.text
        guard select == selected else {
            cell.accessoryType = .none
            return cell
        }
        cell.accessoryType = .checkmark
        return cell
    }
    
    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        40
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        guard indexPath.section == 1 else {
            ascending = !ascending
            tableView.reloadRows(at: [indexPath], with: .automatic)
            delegate?.sortController(didSelect: selected, ascending: ascending)
            giveFeedback(.light)
            return
        }
        giveFeedback(.medium)
        selected = sortCriteria(for: indexPath.row)
        tableView.reloadRows(at: [indexPath], with: .automatic)
        delegate?.sortController(didSelect: selected, ascending: ascending)
        self.dismiss(animated: true)
    }
}