import Dependencies
import DependenciesMacros
import Foundation

public extension DependencyValues {
  var dateFormatter: DateFormatterKey {
    get { self[DateFormatterKey.self] }
    set { self[DateFormatterKey.self] = newValue }
  }
}

@DependencyClient
public struct DateFormatterKey: Sendable {
  public var string: @Sendable (Date?) -> String = { _ in "N/A" }
}

extension DateFormatterKey: DependencyKey {
  public static let testValue = Self()

  public static var liveValue: DateFormatterKey {
    .init(
      string: { date in
        guard let date else { return "N/A" }
        let formatter = ISO8601DateFormatter()
        formatter.timeZone = TimeZone(identifier: "UTC")
        formatter.formatOptions = [.withFullDate]
        return formatter.string(from: date)
      }
    )
  }
}

// #if hasFeature(RetroactiveAttribute)
//   extension DateFormatter: @retroactive DependencyKey {
//
//     public static var liveValue: DateFormatter {
//       let formatter = DateFormatter()
//       formatter.dateStyle = .short
//       return formatter
//     }
//   }
// #else
//   extension DateFormatter: DependencyKey {
//     public static var liveValue: DateFormatter {
//       let formatter = ISO8601DateFormatter()
//       formatter.locale = Locale(identifier: "en_US_POSIX")
//       // formatter.dateFormat = "mm/dd/yyyy"
//       formatter.formatOptions = [.withFullDate]
//       formatter.timeZone = TimeZone(identifier: "UTC")
//       return formatter
//     }
//   }
// #endif