//
//  TabsTableViewController.swift
//  Tusker
//
//  Created by Shadowfacts on 10/5/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit

class TabsTableViewController: UITableViewController {

    var tabs: [(Tab, Bool)] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.register(UINib(nibName: "TabTableViewCell", bundle: nil), forCellReuseIdentifier: "tabCell")
        
        tabs = Preferences.shared.tabs.filter { $0.value >= 0 }.sorted(by: { $0.value < $1.value }).map { ($0.key, true) }
        tabs.append(contentsOf: Preferences.shared.tabs.filter { $0.value == -1 }.map { ($0.key, false) })
        
        tableView.setEditing(true, animated: false)
    }
    
    func updatePreferences() {
        var dict = [Tab: Int]()
        var maxIndex = 0
        for (tab, enabled) in tabs {
            if enabled {
                dict[tab] = maxIndex
                maxIndex += 1
            } else {
                dict[tab] = -1
            }
        }
        Preferences.shared.tabs = dict
        
        guard let tabBarController = tabBarController as? MainTabBarViewController else { fatalError("Tab bar controller should be of type MainTabBarViewController") }
        tabBarController.updateTabs(animated: true)
    }
    
    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return tabs.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "tabCell", for: indexPath) as? TabTableViewCell else { fatalError() }

        let (tab, _) = tabs[indexPath.row]
        cell.updateUI(for: tab)
        cell.delegate = self

        return cell
    }
    
    override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle {
        return .none
    }
    
    override func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        let tab = tabs.remove(at: sourceIndexPath.row)
        tabs.insert(tab, at: destinationIndexPath.row)
        updatePreferences()
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

extension TabsTableViewController: TabTableViewCellDelegate {
    func setEnabled(tab: Tab, enabled: Bool) {
        let index = tabs.firstIndex(where: { $0.0 == tab })!
        tabs[index] = (tab, enabled)
        updatePreferences()
    }
}