import SharedModels
import Styleguide
import SwiftUI

/// Represents the message of a flagged value result, which is stylable using the
/// `.flaggedMessageLabelStyle` modifier on a view.
///
/// By default the status label is colored using the default status color.
public struct FlaggedMessageLabel: View {
  @Environment(\.flaggedMessageLabelStyle) private var style
  let message: String?

  public init(message: String?) {
    self.message = message
  }

  public var body: some View {
    if let message {
      TextLabel(message)
        .textLabelStyle(style)
    }
  }
}

private struct FlaggedMessageLabelStyleKey: EnvironmentKey {
  static let defaultValue = MainActor.assumeIsolated {
    AnyTextLabelStyle(style: .font(.caption))
  }
}

extension EnvironmentValues {
  var flaggedMessageLabelStyle: AnyTextLabelStyle {
    get { self[FlaggedMessageLabelStyleKey.self] }
    set { self[FlaggedMessageLabelStyleKey.self] = newValue }
  }
}

extension View {
  public func flaggedMessageLabelStyle(_ style: AnyTextLabelStyle) -> some View {
    environment(\.flaggedMessageLabelStyle, style)
  }

  public func flaggedMessageLabelStyle<S: TextLabelStyle>(_ style: S) -> some View {
    flaggedMessageLabelStyle(AnyTextLabelStyle(style: style))
  }
}


#Preview {
  FlaggedStatusLabel(status: .warning)
    .flaggedStatusLabelStyle(.textLabel(.heavyTitle2))
}