import AppKit
import ArgumentParser
import Foundation

extension phbar {
	struct start: ParsableCommand {
		static let configuration = CommandConfiguration(
			commandName: "start",
			abstract: "Start the status bar."
		)

		@Flag(name: .long, help: "Display visual guides to help align elements.")
		var debug: Bool = false

		mutating func run() throws {
			let config = try PHConfig.load()

			// NOTE: Make sure NSApp.run() runs in the main thread
			dispatchPrecondition(condition: .onQueue(.main))

			try MainActor.assumeIsolated {
				// Spawn a bar on every screen; per-monitor window and block-set
				// selection is driven by the config's `[monitor]` overrides.
				let screens = NSScreen.screens
				guard !screens.isEmpty else { throw CleanExit.message("No monitor found") }

				let delegate = try AppDelegate(
					config: config,
					screens: screens,
					debug: debug
				)
				let app = NSApplication.shared
				app.setActivationPolicy(.accessory)
				app.delegate = delegate
				app.run()

				throw ExitCode.success
			}
		}
	}
}