//
//  SelectDocumentPicker.swift
//  Browse
//
//  Created by Javier Cicchelli on 17/12/2022.
//  Copyright © 2022 Röck+Cöde. All rights reserved.
//

import Foundation
import SwiftUI
import UIKit

struct SelectDocumentPicker: UIViewControllerRepresentable {
    
    // MARK: Type aliases
    
    typealias SelectedClosure = ([URL]) -> Void
    typealias CancelledClosure = () -> Void

    // MARK: Properties
    
    private let selected: SelectedClosure
    private let cancelled: CancelledClosure?
    
    // MARK: Initialisers
    
    init(
        selected: @escaping SelectedClosure,
        cancelled: CancelledClosure? = nil
    ) {
        self.selected = selected
        self.cancelled = cancelled
    }

    // MARK: Functions
    
    func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
        let controller = UIDocumentPickerViewController(
            forOpeningContentTypes: [.item],
            asCopy: true
        )
        
        controller.allowsMultipleSelection = false
        controller.shouldShowFileExtensions = false
        controller.delegate = context.coordinator
        
        return controller
    }
    
    func updateUIViewController(
        _ uiViewController: UIDocumentPickerViewController,
        context: Context
    ) { }
    
    func makeCoordinator() -> Coordinator {
        .init(self)
    }

}

// MARK: - Coordinators

extension SelectDocumentPicker {
    class Coordinator: NSObject, UIDocumentPickerDelegate {
        
        // MARK: Properties
        
        private var parent: SelectDocumentPicker
        
        // MARK: Initialisers
        
        init(_ parent: SelectDocumentPicker) {
            self.parent = parent
        }
        
        // MARK: UIDocumentPickerDelegate
        
        func documentPicker(
            _ controller: UIDocumentPickerViewController,
            didPickDocumentsAt urls: [URL]
        ) {
            parent.selected(urls)
        }
        
        func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
            controller.dismiss(animated: true) { [weak self] in
                self?.parent.cancelled?()
            }
        }
        
    }
}