//
//  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: AnyObject {
    
    func capSearchWasDismissed()
    
    func capSearch(didChange text: String)
    
    func capAccessoryDidDiscardImage()
    
    func capAccessory(shouldSave image: UIImage)
    
    func capAccessoryCameraButtonPressed()
}

class SearchAndDisplayAccessory: PassthroughView {
    
    // MARK: - Outlets

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

    var currentImage: UIImage? {
        capImage.image
    }
    
    var isShowingCapImage: Bool {
        capImage.image != nil
    }

    // 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!)
        
        hideImageView()
        
        searchBar.text = nil
        searchBar.setShowsCancelButton(false, animated: false)
        searchBar.delegate = self
    }

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

    // MARK: Cap image
    
    func showImageView(with image: UIImage) {
        capImage.image = image
        cameraButton.setImage(UIImage(systemName: "xmark"), for: .normal)
        
        imageHeightContraint.constant = 90
        capImage.alpha = 1
        capImage.isHidden = false
        saveButton.isHidden = false
    }
    
    func discardImage() {
        DispatchQueue.main.async {
            self.dismissAndClearSearchBar()
            self.hideImageView()
        }
        delegate?.capAccessoryDidDiscardImage()
    }
    
    func hideImageView() {
        capImage.image = nil
        cameraButton.setImage(UIImage(systemName: "camera"), for: .normal)
        
        //imageHeightContraint.constant = 0
        capImage.alpha = 0
        capImage.isHidden = true
        saveButton.isHidden = true
    }
}

// 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)
    }
}