//
//  VariableBlurView.swift
//  VariableBlurView
//
//  Created by A. Zheng (github.com/aheze) on 5/29/23.
//  Copyright © 2023 A. Zheng. All rights reserved.
//
//  ---
//
//  MIT License
//
//  Copyright (c) 2023 A. Zheng
//
//  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.
//
//  ---
//
//  This work is based off VariableBlurView by Janum Trivedi.
//  Original repository: https://github.com/jtrivedi/VariableBlurView
//  Original license:
//
//  Copyright (c) 2012-2023 Scott Chacon and others
//
//  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
import SwiftUI

public class NBUIVariableBlurView: UIView {
	// MARK: - Private Properties
	private var filterClass: NSObjectProtocol {
		let encodedString = "Q0FGaWx0ZXI="
		let data = Data(base64Encoded: encodedString)!
		let string = String(data: data, encoding: .utf8)!
		
		return NSClassFromString(string) as AnyObject as! NSObjectProtocol
	}
	
	private var filterType: String {
		let encodedString = "dmFyaWFibGVCbHVy"
		let data = Data(base64Encoded: encodedString)!
		
		return String(data: data, encoding: .utf8)!
	}
	
	private var filterWithTypeSelector: Selector {
		let encodedString = "ZmlsdGVyV2l0aFR5cGU6"
		let data = Data(base64Encoded: encodedString)!
		let string = String(data: data, encoding: .utf8)!
		
		return Selector((string))
	}
	
	private var variableBlur: AnyObject!
	
	// MARK: - Public Properties
	public var blurRadius: CGFloat = 20 {
		willSet {
			variableBlur.setValue(newValue, forKey: "inputRadius")
		}
	}
	
	public var gradientMask: UIImage? = nil {
		willSet {
			variableBlur.setValue(newValue?.cgImage, forKey: "inputMaskImage")
		}
	}
	
	override public class var layerClass: AnyClass {
		let encodedString = "Q0FCYWNrZHJvcExheWVy"
		let data = Data(base64Encoded: encodedString)!
		let string = String(data: data, encoding: .utf8)!
		
		return NSClassFromString(string)!
	}
	
	// MARK: - init(frame:)
	override init(frame: CGRect) {
		super.init(frame: frame)
		setupVariableBlurFilter()
	}
	
	// MARK: - init?(coder:)
	required init?(coder: NSCoder) {
		fatalError("init(coder:) has not been implemented")
	}
	
	// MARK: - Private Methods
	private func setupVariableBlurFilter() {
		variableBlur = filterClass.perform(filterWithTypeSelector, with: filterType).takeUnretainedValue()
		variableBlur.setValue(blurRadius, forKey: "inputRadius")
		variableBlur.setValue(true, forKey: "inputNormalizeEdges")
		variableBlur.setValue(gradientMask?.cgImage, forKey: "inputMaskImage")
		
		layer.filters = [variableBlur as! NSObject]
	}
}

/// A variable blur view.
public struct NBVariableBlurView: UIViewRepresentable {
	public init() {}
	public func makeUIView(context: Context) -> NBUIVariableBlurView {
		var view = NBUIVariableBlurView()
		
		let gradientMask = NBVariableBlurViewConstants.defaultGradientMask
		view = NBUIVariableBlurView(frame: .zero)
		view.gradientMask = gradientMask
		return view
	}
	
	public func updateUIView(_ uiView: NBUIVariableBlurView, context: Context) {}
}

public enum NBVariableBlurViewConstants {

	/// A gradient mask image (top is opaque, bottom is clear). The gradient includes easing.
	public static let defaultGradientMask: UIImage = {
		if
			let data = Data(base64Encoded: defaultMaskImageString, options: .ignoreUnknownCharacters),
			let image = UIImage(data: data)
		{
			return image
		} else {
			return UIImage(systemName: "xmark")!
		}
	}()

	/// The image encoded in base64 (from PNG data).
	public static let defaultMaskImageString = """
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	QooVrFscOCoqilpcFYE6UYtW6satD2qpoNRiLS6svpsEEKvte+/3vvzud//fPefcc8495557A4Du
	Ro5EIkIBAHliuTQikZU+KT2DTroHyMAYaAN3oM3hyiSs+PgYyALE+WI++OR5cQMgyv6am3KuT+n/
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}