//
//  Copyright (c) 2019 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import UIKit

open class QRCodeReaderView: UIView {

    private let cameraView = UIView()
    
    private weak var reader: QRCodeReader?

    public let overlay = QRCodeOverlayView()

    // MARK: - Intializers

    public init() {
        super.init(frame: .zero)

        overlay.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        
        addSubview(cameraView)
        addSubview(overlay)
    }

    required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Public Methods

    public func setReader(_ reader: QRCodeReader) {
        reader.readerView = self
        self.reader = reader
        
        cameraView.layer.sublayers?.forEach {
            $0.removeFromSuperlayer()
        }

        cameraView.layer.insertSublayer(reader.previewLayer, at: 0)
    }

    public func updateRectOfInterestBasedOnFocusView() {
        guard let reader = reader, let focusView = overlay.focusView else {
            return
        }

        let focusViewRect = convert(focusView.frame, from: focusView)
        let interestRect = reader.previewLayer.metadataOutputRectConverted(fromLayerRect: focusViewRect)

        reader.metadataOutput.rectOfInterest = interestRect
    }
    
    override open func layoutSubviews() {
        super.layoutSubviews()
        
        reader?.previewLayer.frame = bounds
        overlay.frame = bounds
        
        updateRectOfInterestBasedOnFocusView()
    }
}