//
//  QRCode+Detector.swift
//
//  Created by Darren Ford on 3/5/2022.
//  Copyright © 2022 Darren Ford. All rights reserved.
//
//  MIT license
//
//  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.
//

#if !os(watchOS)

import CoreGraphics
import CoreImage
import Foundation

public extension QRCode {
	/// Detect QR code(s) in the specified image using CoreImage
	/// - Parameter image: The image in which to detect QRCodes
	/// - Returns: An array of detected QR Codes
	///
	/// Note: If the QR code contains raw data (ie. not a string) CoreImage has no mechanism to extract raw data.
	@objc static func Detect(_ image: CGImage) -> [CIQRCodeFeature] {
		var options: [String: Any] = [CIDetectorAccuracy: CIDetectorAccuracyHigh]
		let context = CIContext()
		let ciImage = CIImage(cgImage: image)
		guard let qrDetector = CIDetector(ofType: CIDetectorTypeQRCode, context: context, options: options) else {
			return []
		}
		if ciImage.properties.keys.contains(kCGImagePropertyOrientation as String) {
			options = [CIDetectorImageOrientation: ciImage.properties[kCGImagePropertyOrientation as String] ?? 1]
		}
		else {
			options = [CIDetectorImageOrientation: 1]
		}
		return qrDetector
			.features(in: ciImage, options: options)
			.compactMap { $0 as? CIQRCodeFeature }
	}
}

#endif
