import CoreGraphics
import Foundation

// Posts one synthetic left click at global screen coordinates.
// Usage: swift click.swift <x> <y>

guard CommandLine.arguments.count > 2,
  let x = Double(CommandLine.arguments[1]),
  let y = Double(CommandLine.arguments[2])
else {
  FileHandle.standardError.write(Data("usage: click.swift <x> <y>\n".utf8))
  exit(2)
}

let point = CGPoint(x: x, y: y)
let source = CGEventSource(stateID: .hidSystemState)

guard
  let move = CGEvent(mouseEventSource: source, mouseType: .mouseMoved, mouseCursorPosition: point, mouseButton: .left),
  let down = CGEvent(mouseEventSource: source, mouseType: .leftMouseDown, mouseCursorPosition: point, mouseButton: .left),
  let up = CGEvent(mouseEventSource: source, mouseType: .leftMouseUp, mouseCursorPosition: point, mouseButton: .left)
else {
  FileHandle.standardError.write(Data("cannot create events\n".utf8))
  exit(1)
}

move.post(tap: .cghidEventTap)
usleep(120_000)
down.post(tap: .cghidEventTap)
usleep(80_000)
up.post(tap: .cghidEventTap)
print("clicked at \(Int(x)),\(Int(y))")