//
//  TextKitContext.swift
//  Cassowary
//
//  Created by nangezao on 2018/1/24.
//  Copyright © 2018年 nange. All rights reserved.
//
/// 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.
///
/// 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

public struct TextContext{
  let layoutManager = NSLayoutManager()
  let textContainer = NSTextContainer()
  let textStorage = NSTextStorage()
  let constraintSize: CGSize
  
  public typealias TextKitLockedBlock = (NSLayoutManager,NSTextContainer, NSTextStorage)->()
  
  init(attributeText: NSAttributedString,
       lineBreakMode: NSLineBreakMode,
       maxNumberOfLines: Int,
       exclusionPaths: [UIBezierPath],
       constraintSize: CGSize) {
    
    // remove extra white space
    layoutManager.usesFontLeading = false
    textStorage.addLayoutManager(layoutManager)
    textStorage.setAttributedString(attributeText)
    
    textContainer.size = constraintSize
    textContainer.lineFragmentPadding = 0
    textContainer.lineBreakMode = lineBreakMode
    textContainer.maximumNumberOfLines = maxNumberOfLines
    textContainer.exclusionPaths = exclusionPaths
    layoutManager.addTextContainer(textContainer)
    self.constraintSize = constraintSize
  }
  
  public func performBlockWithLockedComponent(_ block: TextKitLockedBlock){
    block(layoutManager,textContainer,textStorage)
  }
  
}
