import AppKit

extension PHBarDelegate {
	/// Build, show, and start a bar for `screen`. Returns `false` (and prints to
	/// stderr) if the screen's theme or blocks fail to load, so one bad screen
	/// can't take down the others.
	@discardableResult
	func addBar(for screen: NSScreen) -> Bool {
		let controller: BarController
		do {
			controller = try factory.make(for: screen)
		} catch {
			stderr("skipping screen \(screen.localizedName): \(error)")
			return false
		}
		let window = BarWindow(controller: controller)
		window.orderFront(nil)
		windows.append(window)
		controller.startAutoRefresh()
		return true
	}

	/// Stop refresh, hide, and drop the bar running on `screen` (if any).
	func removeBar(for screen: NSScreen) {
		guard let index = windows.firstIndex(where: { $0.barController.screen === screen }) else {
			return
		}
		windows[index].barController.stopAutoRefresh()
		windows[index].orderOut(nil)
		windows.remove(at: index)
	}

	/// The window currently running on `screen`, if any.
	func window(for screen: NSScreen) -> BarWindow? {
		windows.first { $0.barController.screen === screen }
	}

	/// The window currently running on the monitor named `name`, if any.
	func window(named name: String) -> BarWindow? {
		windows.first { $0.barController.screen.localizedName == name }
	}
}