Unsplash.swift

import Foundation

/// https://source.unsplash.com
public struct Unsplash {
  public struct Source: RawRepresentable {
    public let rawValue: String

    public init(rawValue: String) {
      self.rawValue = rawValue
    }

    public static let random = Self(rawValue: "random")

    public static func user(name: String) -> Self {
      Self(rawValue: "user/\(name)")
    }

    public static func userLikes(name: String) -> Self {
      Self(rawValue: "user/\(name)/likes")
    }

    public static func collection(id: Int) -> Self {
      Self(rawValue: "collection/\(id)")
    }
  }

  public static func url(
    source: Source = .random,
    width: Int,
    height: Int,
    keywords: [String]
  ) -> URL {
    var components = URLComponents(
      string: "https://source.unsplash.com"
    )!

    components.path = "/\(source.rawValue)/\(width)x\(height)"

    if keywords.isEmpty == false {
      components.query = keywords.joined(separator: ",")
    }

    return components.url!
  }

  public static func url(
    source: Source = .random,
    width: Int,
    height: Int,
    keywords: String...
  ) -> URL {
    self.url(
      source: source,
      width: width,
      height: height,
      keywords: keywords
    )
  }

  public static func url(
    source: Source = .random,
    size: Int,
    keywords: String...
  ) -> URL {
    self.url(
      source: source,
      width: size,
      height: size,
      keywords: keywords
    )
  }
}