import AppKit
import Darwin

@main
@MainActor
enum TerebiCLI {
    static func main() async {
        let command: PlayerCommand
        do {
            command = try PlayerCommand.parse(Array(CommandLine.arguments.dropFirst()))
        } catch {
            fail(error.localizedDescription, code: 64)
        }
        switch command {
        case .help:
            print(PlayerCommand.usage)
        case .launch(let url):
            guard let executable = Bundle.main.executableURL else {
                fail("Could not locate the CLI executable.", code: 69)
            }
            let app = executable.resolvingSymlinksInPath().deletingLastPathComponent()
                .appendingPathComponent("terebi.app", isDirectory: true)
            let configuration = NSWorkspace.OpenConfiguration()
            do {
                // Launch without media first so SwiftUI creates its singleton window.
                _ = try await NSWorkspace.shared.openApplication(at: app, configuration: configuration)
                if let url {
                    _ = try await NSWorkspace.shared.open([url], withApplicationAt: app, configuration: configuration)
                }
            } catch {
                fail("Could not launch the player: \(error.localizedDescription)", code: 69)
            }
        }
    }

    private static func fail(_ message: String, code: Int32) -> Never {
        FileHandle.standardError.write(Data("terebi: \(message)\n".utf8))
        exit(code)
    }
}