//
//  ImagePicker.swift
//
//  Created by JungpyoHong on 4/21/21.
//
import UIKit

public protocol ImagePickerDelegate: AnyObject {
    func didSelect(image: UIImage?)
}

open class ImagePicker: NSObject {
    
    private let imagePicker: UIImagePickerController
    private weak var presentationController: UIViewController?
    private weak var delegate: ImagePickerDelegate?
    
    public init(presentationController: UIViewController, delegate: ImagePickerDelegate) {
        self.imagePicker = UIImagePickerController()
        
        super.init()
        
        self.presentationController = presentationController
        self.delegate = delegate
        self.imagePicker.delegate = self
        self.imagePicker.allowsEditing = true
        self.imagePicker.mediaTypes = ["public.image"]
    }
    
    private func action(for type: UIImagePickerController.SourceType, title: String) -> UIAlertAction? {
        guard UIImagePickerController.isSourceTypeAvailable(type) else {
            return nil
        }
        
        return UIAlertAction(title: title, style: .default) { [weak self] _ in
            self?.imagePicker.sourceType = type
            self?.presentationController?.present(self?.imagePicker ?? UIImagePickerController(), animated: true)
        }
    }
    
    public func present(from sourceView: UIView) {
        
        let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        if let action = self.action(for: .camera, title: "Take photo") {
            alertController.addAction(action)
        }
        if let action = self.action(for: .savedPhotosAlbum, title: "Camera roll") {
            alertController.addAction(action)
        }
        if let action = self.action(for: .photoLibrary, title: "Photo library") {
            alertController.addAction(action)
        }
        
        alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        self.presentationController?.present(alertController, animated: true)
    }
    
    private func pickerController(_ controller: UIImagePickerController, didSelect image: UIImage?) {
        controller.dismiss(animated: true, completion: nil)
        
        self.delegate?.didSelect(image: image)
    }
}

extension ImagePicker: UIImagePickerControllerDelegate {
    
    public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.pickerController(picker, didSelect: nil)
    }
    
    public func imagePickerController(_ picker: UIImagePickerController,
                                      didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
        guard let image = info[.editedImage] as? UIImage else {
            return self.pickerController(picker, didSelect: nil)
        }
        self.pickerController(picker, didSelect: image)
    }
}

extension ImagePicker: UINavigationControllerDelegate {
}