//
//  AppExtention.swift
//  Learn Genie
//
//  Created by Suraj Kumar Mandal on 02/09/21.
//

import Foundation
import UIKit

extension UIApplication {
    class func isFirstLaunch() -> Bool {
        if !UserDefaults.standard.bool(forKey: "hasBeenLaunchedBeforeFlag") {
            UserDefaults.standard.set(true, forKey: "hasBeenLaunchedBeforeFlag")
            UserDefaults.standard.synchronize()
            return true
        }
        return false
    }
}

extension String {
    var htmlToAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else { return NSAttributedString() }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            return NSAttributedString()
        }
    }
    
    var htmlToString: String {
        return htmlToAttributedString?.string ?? ""
    }
    
    //  Stripping out HTML tags from a string
    public func trimHTMLTags() -> String? {
        guard let htmlStringData = self.data(using: String.Encoding.utf8) else {
            return nil
        }
        
        let options: [NSAttributedString.DocumentReadingOptionKey : Any] = [
            .documentType: NSAttributedString.DocumentType.html,
            .characterEncoding: String.Encoding.utf8.rawValue
        ]
        
        let attributedString = try? NSAttributedString(data: htmlStringData, options: options, documentAttributes: nil)
        return attributedString?.string
    }
    
    func stringBefore(_ delimiter: Character) -> String {
        if let index = firstIndex(of: delimiter) {
            return String(prefix(upTo: index))
        } else {
            return ""
        }
    }
    
    func stringAfter(_ delimiter: Character) -> String {
        if let index = firstIndex(of: delimiter) {
            return String(suffix(from: index).dropFirst())
        } else {
            return ""
        }
    }
    
    func toDateString( inputDateFormat inputFormat  : String,  ouputDateFormat outputFormat  : String ) -> String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = inputFormat
        let date = dateFormatter.date(from: self)
        dateFormatter.dateFormat = outputFormat
        return dateFormatter.string(from: date!)
    }
    
}

extension Data {
    
    init<T>(fromArray values: [T]) {
        var values = values
        self.init(buffer: UnsafeBufferPointer(start: &values, count: values.count))
    }
    
    func toArray<T>(type: T.Type) -> [T] {
        let value = self.withUnsafeBytes {
            $0.baseAddress?.assumingMemoryBound(to: T.self)
        }
        return [T](UnsafeBufferPointer(start: value, count: self.count / MemoryLayout<T>.stride))
    }
    
}

extension UITextField {
    func datePicker<T>(target: T,
                       doneAction: Selector,
                       cancelAction: Selector,
                       datePickerMode: UIDatePicker.Mode = .date) {
        let screenWidth = UIScreen.main.bounds.width
        
        func buttonItem(withSystemItemStyle style: UIBarButtonItem.SystemItem) -> UIBarButtonItem {
            let buttonTarget = style == .flexibleSpace ? nil : target
            let action: Selector? = {
                switch style {
                case .cancel:
                    return cancelAction
                case .done:
                    return doneAction
                default:
                    return nil
                }
            }()
            
            let barButtonItem = UIBarButtonItem(barButtonSystemItem: style,
                                                target: buttonTarget,
                                                action: action)
            
            return barButtonItem
        }
        
        let datePicker = UIDatePicker(frame: CGRect(x: 0,
                                                    y: 0,
                                                    width: screenWidth,
                                                    height: 216))
        datePicker.datePickerMode = datePickerMode
        datePicker.maximumDate = Date()
        // iOS 14 and above
        if #available(iOS 14, *) {
            datePicker.preferredDatePickerStyle = .wheels
            datePicker.sizeToFit()
        }
        self.inputView = datePicker
        
        let toolBar = UIToolbar(frame: CGRect(x: 0,
                                              y: 0,
                                              width: screenWidth,
                                              height: 44))
        toolBar.setItems([buttonItem(withSystemItemStyle: .cancel),
                          buttonItem(withSystemItemStyle: .flexibleSpace),
                          buttonItem(withSystemItemStyle: .done)],
                         animated: true)
        self.inputAccessoryView = toolBar
    }
}

extension UIWindow {
    static var key: UIWindow? {
        if #available(iOS 13, *) {
            return UIApplication.shared.windows.first { $0.isKeyWindow }
        } else {
            return UIApplication.shared.keyWindow
        }
    }
}

extension String {
    var isValidEmail: Bool {
        NSPredicate(format: "SELF MATCHES %@", "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}").evaluate(with: self)
    }
}