MessageKit/Sources/Views/LinkPreviewView.swift

// MIT License
//
// Copyright (c) 2017-2019 MessageKit
//
// 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

open class LinkPreviewView: UIView {
  // MARK: Lifecycle

  init() {
    super.init(frame: .zero)

    contentView.addSubview(titleLabel)
    NSLayoutConstraint.activate([
      titleLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
      titleLabel.topAnchor.constraint(equalTo: contentView.topAnchor),
      titleLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
    ])

    contentView.addSubview(teaserLabel)
    NSLayoutConstraint.activate([
      teaserLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
      teaserLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 3),
      teaserLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
    ])
    teaserLabel.setContentHuggingPriority(.init(249), for: .vertical)

    contentView.addSubview(domainLabel)
    NSLayoutConstraint.activate([
      domainLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
      domainLabel.topAnchor.constraint(equalTo: teaserLabel.bottomAnchor, constant: 3),
      domainLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
      domainLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
    ])
  }

  required public init?(coder _: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  // MARK: Internal

  lazy var imageView: UIImageView = {
    let imageView: UIImageView = .init()
    imageView.clipsToBounds = true
    imageView.contentMode = .scaleAspectFill
    imageView.translatesAutoresizingMaskIntoConstraints = false

    addSubview(imageView)

    NSLayoutConstraint.activate([
      imageView.leadingAnchor.constraint(equalTo: leadingAnchor),
      imageView.topAnchor.constraint(equalTo: topAnchor),
      imageView.heightAnchor.constraint(equalTo: imageView.widthAnchor, multiplier: 1),
      imageView.widthAnchor.constraint(equalToConstant: LinkPreviewMessageSizeCalculator.imageViewSize),
      imageView.bottomAnchor.constraint(lessThanOrEqualTo: bottomAnchor),
    ])

    return imageView
  }()

  lazy var titleLabel: UILabel = {
    let label: UILabel = .init()
    label.numberOfLines = 0
    label.translatesAutoresizingMaskIntoConstraints = false
    return label
  }()

  lazy var teaserLabel: UILabel = {
    let label: UILabel = .init()
    label.numberOfLines = 0
    label.translatesAutoresizingMaskIntoConstraints = false
    return label
  }()

  lazy var domainLabel: UILabel = {
    let label: UILabel = .init()
    label.numberOfLines = 0
    label.translatesAutoresizingMaskIntoConstraints = false
    return label
  }()

  // MARK: Private

  private lazy var contentView: UIView = {
    let view: UIView = .init(frame: .zero)
    view.translatesAutoresizingMaskIntoConstraints = false

    addSubview(view)

    NSLayoutConstraint.activate([
      view.topAnchor.constraint(equalTo: topAnchor),
      view.leadingAnchor.constraint(
        equalTo: imageView.trailingAnchor,
        constant: LinkPreviewMessageSizeCalculator.imageViewMargin),
      view.trailingAnchor.constraint(equalTo: trailingAnchor),
      view.bottomAnchor.constraint(equalTo: bottomAnchor),
    ])

    return view
  }()
}