ViewController.swift

//
//  ViewController.swift
//  Day59 - Milestone - Projects 13-14-15
//
//  Created by Jean-Yves Garcin on 22/06/2023.
//

import UIKit

class ViewController: UITableViewController {
    var countries = [Country]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        title = "Country Facts"
        
        DispatchQueue.global(qos: .userInitiated).async {
            [weak self] in
            if let datafile = Bundle.main.url(forResource: "countries", withExtension: "json") {
                if let data = try? Data(contentsOf: datafile) {
                    self?.parse(json: data)
                    return
                }
            }
            self?.showError()
        }
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return countries.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Country", for: indexPath)
        
        let country = countries[indexPath.row]
        cell.textLabel?.text = country.name
        //cell.detailTextLabel?.text = country.body
        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if let vc = storyboard?.instantiateViewController(withIdentifier: "sb_Detail") as? DetailTableViewController {
            vc.country = countries[indexPath.row]
            
            navigationController?.pushViewController(vc, animated: true)
        }
    }
    
    func parse(json: Data) {
        let decoder = JSONDecoder()
        
        if let jsonPetitions = try? decoder.decode(Countries.self, from: json) {
            countries = jsonPetitions.items
            
            DispatchQueue.main.async {
                [weak self] in
                self?.tableView.reloadData()
            }
        }
    }
    
    func showError() {
        DispatchQueue.main.async {
            [weak self] in
            let ac = UIAlertController(title: "Loading error", message: "There was a problem loading the feed, please check your connection and try again.", preferredStyle: .alert)
            ac.addAction(UIAlertAction(title: "OK", style: .default))
            self?.present(ac, animated: true)
        }
    }

}