/// Copyright (c) 2020 Razeware LLC
///
/// 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.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// This project and source code may use libraries or frameworks that are
/// released under various Open-Source licenses. Use of those libraries and
/// frameworks are governed by their own individual licenses.
///
/// 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

extension UIImage {
  static func swatchBackground(size: CGSize = CGSize(width: 42, height: 18)) -> UIImage? {
    var image: UIImage?
    let rect = CGRect(origin: .zero, size: size)

    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0)
    UIColor.black.set()
    let path = UIBezierPath(
      roundedRect: rect.inset(by: UIEdgeInsets(top: 1, left: 1, bottom: 1, right: 1)),
      cornerRadius: 4.0)
    path.lineWidth = 2.0
    path.stroke()
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
  }

  static func swatchForeground(
    name: String = "",
    size: CGSize = CGSize(width: 42, height: 18)
  ) -> UIImage? {
    var image: UIImage?
    let rect = CGRect(origin: .zero, size: size)

    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0)
    let attr = NSAttributedString(
      string: name.firstThreeLettersCapitalized(),
      attributes: [.font: UIFont.systemFont(ofSize: 14)])
    attr.draw(at: CGPoint(x: 7, y: 0))
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
  }

  static func swatchOnePiece(
    name: String = "",
    size: CGSize = CGSize(width: 42, height: 18)
  ) -> UIImage? {
    var image: UIImage?
    let rect = CGRect(origin: .zero, size: size)

    UIGraphicsBeginImageContextWithOptions(rect.size, false, 0)
    swatchBackground()?.draw(at: .zero)
    swatchForeground(name: name)?.draw(at: .zero)
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
  }
}

extension String {
  func firstThreeLettersCapitalized() -> String {
    let value = self.uppercased()
    if value.count < 3 {
      return value
    }
    let toIndex = value.index(value.startIndex, offsetBy: 3)
    return String(value[..<toIndex])
  }
}
