ViewController.swift

//
//  ViewController.swift
//  CameraCaptions
//
//  Created by Julian Moorhouse on 07/08/2019.
//  Copyright © 2019 Mindwarp Consultancy Ltd. All rights reserved.
//

import UIKit

class ViewController: UITableViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var photos = [Photo]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        navigationController?.navigationBar.prefersLargeTitles = true

        navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addNewPhoto))
        
        title = "Photos"
        
        performSelector(inBackground: #selector(loadImages), with: nil)
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return photos.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Photo", for: indexPath)

        cell.textLabel?.text = photos[indexPath.row].caption
  
        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if let vc = storyboard?.instantiateViewController(withIdentifier: "Detail") as? DetailViewController {
            
            let photo = photos[indexPath.row]
            vc.selectedImage = photo.imageFileName
            vc.caption = photo.caption
        
            save()
            
            tableView.performSelector(onMainThread: #selector(UITableView.reloadData), with: nil, waitUntilDone: false)
            
            navigationController?.pushViewController(vc, animated: true)
        }
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        guard let image = info[.editedImage] as? UIImage else { return }
        
        let imageName = UUID().uuidString
        let imagePath = getDocumentsDirectory().appendingPathComponent(imageName)
        
        dismiss(animated: true)
        
        let ac = UIAlertController(title: "Photo", message: "Please provide a name for this photo", preferredStyle: .alert)
        ac.addTextField()
        
        ac.addAction(UIAlertAction(title: "OK", style: .default) {
            [weak self, weak ac] _ in
            guard let newName = ac?.textFields?[0].text else { return }
            
            if let jpegData = image.jpegData(compressionQuality: 0.8) {
                try? jpegData.write(to: imagePath)
            }
            
            let photo = Photo(imageFileName: imageName, caption: newName)
            
            self?.photos.append(photo)
            self?.save()
            self?.tableView.reloadData()
        })
        
        ac.addAction(UIAlertAction(title: "Cancel", style: .cancel))
        present(ac, animated: true)
    }
    
    func getDocumentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }
    
    @objc func loadImages() {
//        let fm = FileManager.default
//        let path = Bundle.main.resourcePath!
//        let items = try! fm.contentsOfDirectory(atPath: path)
//
//        for item in items {
//            if item.hasPrefix("nssl") {
//                // this is a picture to load!
//                storms.append(Storm(pictureName: item, viewCount: 0))
//            }
//        }
//
        load()
        
        //storms.sort()
        print(photos)
        
        tableView.performSelector(onMainThread: #selector(UITableView.reloadData), with: nil, waitUntilDone: false)
    }
    
    @objc func addNewPhoto() {
        let picker = UIImagePickerController()
        picker.allowsEditing = true
        picker.delegate = self
        
        if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerController.SourceType.camera))
        {
            picker.sourceType = UIImagePickerController.SourceType.camera
        }
        
        present(picker, animated: true)
    }
    
    func save() {
        let jsonEncoder = JSONEncoder()
        
        if let savedDate = try? jsonEncoder.encode(photos) {
            let defaults = UserDefaults.standard
            defaults.set(savedDate, forKey: "photos")
        } else {
            print("Failed to save photos")
        }
    }
    
    func load() {
        let defaults = UserDefaults.standard
        
        if let savedPhotos = defaults.object(forKey: "photos") as? Data {
            let jsonDecoder = JSONDecoder()
            
            do {
                photos = try jsonDecoder.decode([Photo].self, from: savedPhotos)
            } catch {
                print("Failed to load photos.")
            }
        }
    }
}