Caps-iOS/CapCollector/Presentation/SearchAndDisplayAccessory.swift

//
//  SearchAndDisplayAccessory.swift
//  CapCollector
//
//  Created by Christoph on 09.10.19.
//  Copyright © 2019 CH. All rights reserved.
//

import UIKit

class PassthroughView: UIView {
    
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let view = super.hitTest(point, with: event)
        return view == self ? nil : view
    }
}

protocol CapAccessoryDelegate: class {
    
    func capSearchWasDismissed()
    
    func capSearch(didChange text: String)
    
    func capAccessoryDidDiscardImage()
    
    func capAccessory(shouldSave image: UIImage)
    
    func capAccessoryCameraButtonPressed()
}

class SearchAndDisplayAccessory: PassthroughView {
    
    // MARK: - Outlets

    @IBOutlet weak var newImageView: PassthroughView!
    
    @IBOutlet weak var capImage: RoundedImageView!
    
    @IBOutlet weak var saveButton: UIButton!
    
    @IBOutlet weak var deleteButton: UIButton!
    
    @IBOutlet weak var cameraButton: UIButton!
    
    @IBOutlet weak var searchBar: UISearchBar!
    
    // MARK: - Actions
    
    @IBAction func cameraButtonPressed() {
        delegate?.capAccessoryCameraButtonPressed()
    }
    
    @IBAction func saveButtonPressed() {
        if let image = capImage.image {
            delegate?.capAccessory(shouldSave: image)
        }
    }
    
    @IBAction func cancelButtonPressed() {
        discardImage()
    }
    
    // MARK: - Variables
    
    var view: UIView?
    
    weak var blurView: UIVisualEffectView?
    
    weak var currentBlurContraint: NSLayoutConstraint?
    
    weak var delegate: CapAccessoryDelegate?

    var currentImage: UIImage? {
        capImage.image
    }
    
    // MARK: - Setup
    
    convenience init(width: CGFloat) {
        let frame = CGRect(origin: .zero, size: CGSize(width: width, height: 145))
        self.init(frame: frame)
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setup()
    }
    
    private func setup() {
        view = fromNib()
        view!.frame = bounds
        //view!.autoresizingMask = .flexibleHeight
        addSubview(view!)
        
        let blur = UIBlurEffect(style: .systemThinMaterial)
        let blurView = UIVisualEffectView(effect: blur)
        self.blurView = blurView
        blurView.translatesAutoresizingMaskIntoConstraints = false
        blurView.isUserInteractionEnabled = false
        insertSubview(blurView, at: 0)
        
        let t = searchBar.topAnchor.constraint(equalTo: blurView.topAnchor)
        let b = searchBar.bottomAnchor.constraint(equalTo: blurView.bottomAnchor)
        let l = leadingAnchor.constraint(equalTo: blurView.leadingAnchor)
        let r = trailingAnchor.constraint(equalTo: blurView.trailingAnchor)
        addConstraints([t, b, l, r])
        
        currentBlurContraint = t
        
        self.newImageView.alpha = 0
        self.newImageView.isHidden = true
        
        searchBar.text = nil
        searchBar.setShowsCancelButton(false, animated: false)
        searchBar.delegate = self
        
        cameraButton.setImage(UIImage.templateImage(named: "camera_square"), for: .normal)
    }

    // MARK: Search bar
    
    func dismissAndClearSearchBar() {
        searchBar.resignFirstResponder()
        searchBar.text = nil
    }

    // MARK: Cap image
    
    func showImageView(with image: UIImage, isUnlocked: Bool) {
        capImage.image = image
        
        saveButton.isHidden = !isUnlocked
        saveButton.isEnabled = isUnlocked
        let text = isUnlocked ? "Delete" : "Clear image"
        deleteButton.setTitle(text, for: .normal)
        
        showImageView()
    }
    
    func discardImage() {
        DispatchQueue.main.async {
            self.dismissAndClearSearchBar()
            self.hideImageView()
        }
        delegate?.capAccessoryDidDiscardImage()
    }
    
    func hideImageView() {
        currentBlurContraint?.isActive = false
        let t = searchBar.topAnchor.constraint(equalTo: blurView!.topAnchor)
        addConstraint(t)
        currentBlurContraint = t
        
        self.newImageView.alpha = 0
        self.newImageView.isHidden = true
        self.capImage.image = nil
    }
    
    private func showImageView() {
        currentBlurContraint?.isActive = false
        let t = blurView!.topAnchor.constraint(equalTo: saveButton.topAnchor, constant: -8)
        addConstraint(t)
        currentBlurContraint = t
        
        self.newImageView.isHidden = false
        self.newImageView.alpha = 1
    }
}

// MARK: - UISearchBarDelegate

extension SearchAndDisplayAccessory: UISearchBarDelegate {

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        searchBar.resignFirstResponder()
        searchBar.text = nil
        delegate?.capSearchWasDismissed()
    }

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        searchBar.resignFirstResponder()
    }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        delegate?.capSearch(didChange: searchText)
    }
}