import Foundation
extension UISearchBar {
  @objc override func applyTheme() {
    if styleName.isEmpty {
      setStyle(.searchBar)
    }
    for style in StyleManager.shared.getStyle(styleName)
      where !style.isEmpty && !style.hasExclusion(view: self) {
      UISearchBarRenderer.render(self, style: style)
    }
  }

  @objc override func sw_didMoveToWindow() {
    guard MapsAppDelegate.theApp().window === window else {
      sw_didMoveToWindow();
      return
    }
    applyTheme()
    isStyleApplied = true
    sw_didMoveToWindow();
  }
}

class UISearchBarRenderer: UIViewRenderer {
  class func render(_ control: UISearchBar, style: Style) {
    super.render(control, style: style)

    let searchTextField = control.searchTextField
    // Default search bar implementation adds the grey transparent image for background. This code removes it and updates the corner radius. This is not working on iPad designed for mac.
    if !ProcessInfo.processInfo.isiOSAppOnMac {
      control.setSearchFieldBackgroundImage(UIImage(), for: .normal)
    }
    searchTextField.layer.setCornerRadius(.buttonDefault)
    searchTextField.layer.masksToBounds = true
    // Placeholder color
    if let placeholder = searchTextField.placeholder {
      searchTextField.attributedPlaceholder = NSAttributedString(string: placeholder, attributes: [.foregroundColor: UIColor.gray])
    }
    if let backgroundColor = style.backgroundColor {
      searchTextField.backgroundColor = backgroundColor
    }
    if let font = style.font {
      searchTextField.font = font
    }
    if let fontColor = style.fontColor {
      searchTextField.textColor = fontColor
    }
    if let tintColor = style.tintColor {
      searchTextField.leftView?.tintColor = tintColor
      // Placeholder indicator color
      searchTextField.tintColor = tintColor
      // Clear button image
      let clearButtonImage = UIImage(named: "ic_clear")?.withRenderingMode(.alwaysTemplate).withTintColor(tintColor)
      control.setImage(clearButtonImage, for: .clear, state: .normal)
    }
    if let barTintColor = style.barTintColor {
      let position = control.delegate?.position?(for: control) ?? control.barPosition
      control.setBackgroundImage(barTintColor.getImage(), for: position, barMetrics: .defaultPrompt)
      control.setBackgroundImage(barTintColor.getImage(), for: position, barMetrics: .default)
      control.backgroundColor = barTintColor
    }
    if let fontColorDetailed = style.fontColorDetailed {
      // Cancel button color
      control.tintColor = fontColorDetailed
    }
  }

  //fix for iOS 12 and below
  class func setAppearance() {
    for style in StyleManager.shared.getStyle("SearchBar") {
      if let backgroundColor = style.backgroundColor {
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).backgroundColor = backgroundColor
      }
      if let font = style.font {
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).font = font
      }
      if let fontColor = style.fontColor {
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [.foregroundColor: fontColor]
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).textColor = fontColor
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).leftView?.tintColor = fontColor
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).tintColor = fontColor
      }
    }
  }

  @available(iOS, deprecated: 13.0)
  private static let kiOS12DefaultSystemTextFieldHeight = 36

  @available(iOS, deprecated: 13.0)
  private static var searchBarBackgroundColor: UIColor?

  @available(iOS, deprecated: 13.0)
  private static var searchBarBackgroundImage: UIImage?

  // Draws the background image for the UITextField using the default system's text field height.
  // This approach is used only for iOS 12.
  @available(iOS, deprecated: 13.0)
  private static func getSearchBarBackgroundImage(color: UIColor) -> UIImage? {
    if color != searchBarBackgroundColor {
      let size = CGSize(width: kiOS12DefaultSystemTextFieldHeight, height: kiOS12DefaultSystemTextFieldHeight)
      UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
      guard let context = UIGraphicsGetCurrentContext() else { return nil }
      let rect = CGRect(origin: .zero, size: size)
      let cornerRadius = CGFloat(8)
      let path = UIBezierPath(roundedRect: rect, byRoundingCorners: [.topLeft, .topRight, .bottomLeft, .bottomRight], cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
      context.addPath(path.cgPath)
      context.setFillColor(color.cgColor)
      context.fillPath()
      let image = UIGraphicsGetImageFromCurrentImageContext()
      UIGraphicsEndImageContext()
      searchBarBackgroundImage = image
      searchBarBackgroundColor = color
      return image
    }
    return searchBarBackgroundImage
  }
}