import AppKit
import ApplicationServices
import Carbon.HIToolbox

enum OutputResult {
  case typed
  case copied
  case copiedBecauseAccessibilityIsOff
}

enum TranscriptOutput {
  @MainActor
  static func deliver(_ text: String, to destination: TranscriptDestination) -> OutputResult {
    let pasteboard = NSPasteboard.general
    pasteboard.clearContents()
    pasteboard.setString(text, forType: .string)
    guard destination == .cursor else { return .copied }

    let options = [kAXTrustedCheckOptionPrompt.takeUnretainedValue() as String: true]
    guard AXIsProcessTrustedWithOptions(options as CFDictionary) else {
      return .copiedBecauseAccessibilityIsOff
    }
    guard let source = CGEventSource(stateID: .hidSystemState),
      let keyDown = CGEvent(
        keyboardEventSource: source,
        virtualKey: CGKeyCode(kVK_ANSI_V),
        keyDown: true
      ),
      let keyUp = CGEvent(
        keyboardEventSource: source,
        virtualKey: CGKeyCode(kVK_ANSI_V),
        keyDown: false
      )
    else {
      return .copiedBecauseAccessibilityIsOff
    }
    keyDown.flags = .maskCommand
    keyUp.flags = .maskCommand
    keyDown.post(tap: .cghidEventTap)
    keyUp.post(tap: .cghidEventTap)
    return .typed
  }
}