//
//  SeismicSettingsNetworksViewController.swift
//  Earthquake Network
//
//  Created by Busi Andrea on 14/09/2020.
//  Copyright © 2020 Earthquake Network. All rights reserved.
//

import UIKit


@objc protocol SeismicSettingsNetworksViewControllerDelegate: class {
    func seismicSettingsNetworksControllerDidComplete(_ controller: SeismicSettingsNetworksViewController)
}

class SeismicSettingsNetworksViewController: UITableViewController {

    @objc weak var delegate: SeismicSettingsNetworksViewControllerDelegate?
    
    // MARK: - Private
    
    private var networks = [EQNSeismicNetwork]()
    private var savedNetworks = [String]()
    
    // MARK: - View Lifecycle
    
    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.register(SettingDetailTableViewCell.self, forCellReuseIdentifier: SettingDetailTableViewCell.Identifier)
        tableView.register(SettingSectionHeaderView.self, forHeaderFooterViewReuseIdentifier: SettingSectionHeaderView.Identifier)
        
        loadData()
    }
    
    // MARK: - Private
    
    private func loadData() {
        networks = EQNData.seismicNetworks().sorted(by: { $0.acronym < $1.acronym })

        // load saved selected networks or fill with all available networks
        if let savedNetworks = UserDefaults.standard.object(forKey: IMPOSTAZIONE_ENTI_RETI_SISMICHEI) as? [String] {
            self.savedNetworks = savedNetworks
        } else {
            self.savedNetworks = EQNData.seismicNetworkAcronyms()
        }
    }

    // MARK: - Table view data source

    override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let headerView = tableView.dequeueReusableHeaderFooterView(withIdentifier: SettingSectionHeaderView.Identifier) as! SettingSectionHeaderView
        headerView.titleLabel.text = NSLocalizedString("Reti sismiche", comment: "");
        return headerView
    }
    
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        CGFloat(SettingSectionHeaderView.Height)
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        networks.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let network = networks[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: SettingDetailTableViewCell.Identifier, for: indexPath) as! SettingDetailTableViewCell
        cell.textLabel?.text = "\(network.acronym) (\(network.country))"
        
        if savedNetworks.contains(network.acronym) {
            cell.accessoryType = .checkmark
        } else {
            cell.accessoryType = .none
        }
                
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        let network = networks[indexPath.row]
        if let index = savedNetworks.firstIndex(of: network.acronym) {
            savedNetworks.remove(at: index)
        } else {
            savedNetworks.append(network.acronym)
        }
        
        tableView.reloadRows(at: [indexPath], with: .automatic)
    }
    
    // MARK: - Actions
    
    @IBAction func cancelTapped(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }
    
    @IBAction func saveTapped(_ sender: Any) {
        // save selected networks
        UserDefaults.standard.set(savedNetworks, forKey: IMPOSTAZIONE_ENTI_RETI_SISMICHEI)
        
        // se solo un'ente è selezionato, salviamolo anche come nazione
        if savedNetworks.count == 1 {
            UserDefaults.standard.set(savedNetworks.first!, forKey: IMPOSTAZIONE_NAZIONE_RETI_SISMICHE)
        } else {
            UserDefaults.standard.removeObject(forKey: IMPOSTAZIONE_NAZIONE_RETI_SISMICHE)
        }
        
        delegate?.seismicSettingsNetworksControllerDidComplete(self)
        dismiss(animated: true, completion: nil)
    }
}