import Cocoa
import FlutterMacOS

// Entry point Flutter calls into via RegisterGeneratedPlugins - this is what
// makes CursorLock and the eyedropper "just work" for any app that depends
// on garage_ui, without that app having to hand-wire the channels itself in
// its own MainFlutterWindow.swift. Used to be duplicated per-app, which is
// exactly how it silently went stale (renamed channel on one side, not the
// other) and why a brand new app (no Runner wiring at all) got a
// MissingPluginException out of the box.
public class GarageUiPlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterPluginRegistrar) {
    let instance = GarageUiPlugin()

    let cursorLockChannel = FlutterMethodChannel(
      name: "garage/cursor_lock",
      binaryMessenger: registrar.messenger
    )
    // CursorLock needs to hang on to the channel itself so it can push
    // scrubDelta calls back to dart - see its own header for why a plain
    // local var here isnt enough (it needs a home that outlives this fn)
    CursorLock.shared.attach(channel: cursorLockChannel)
    registrar.addMethodCallDelegate(instance, channel: cursorLockChannel)

    let eyedropperChannel = FlutterMethodChannel(
      name: "garage/eyedropper",
      binaryMessenger: registrar.messenger
    )
    registrar.addMethodCallDelegate(instance, channel: eyedropperChannel)
  }

  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    switch call.method {
    case "lock":
      CursorLock.shared.lock()
      result(nil)
    case "unlock":
      CursorLock.shared.unlock()
      result(nil)
    case "isAvailable":
      if #available(macOS 10.15, *) {
        result(true)
      } else {
        result(false)
      }
    case "pick":
      if #available(macOS 10.15, *) {
        ScreenColorSampler.shared.show(result: result)
      } else {
        // dart reads nil as a cancel, which is close enough - it only ever
        // asks for a pick after isAvailable said yes anyway
        result(nil)
      }
    default:
      result(FlutterMethodNotImplemented)
    }
  }
}