import AppKit
import Darwin

@main
@MainActor
enum TerebiBootstrap {
    static func main() {
        let app = Bundle.main.bundleURL
        if let error = FFmpegRuntime.error(for: app) {
            fail(error)
        }
        let payload = app.appendingPathComponent("Contents/MacOS/terebi-player")
        let errorCode = payload.path.withCString { path in
            _ = execv(path, CommandLine.unsafeArgv)
            return errno
        }
        let detail = String(cString: strerror(errorCode))
        fail("Could not start the player: \(detail)\n\nPlayer executable: \(payload.path)\nRebuild and reinstall terebi.")
    }

    private static func fail(_ message: String) -> Never {
        FileHandle.standardError.write(Data("terebi: \(message)\n".utf8))
        let application = NSApplication.shared
        application.setActivationPolicy(.regular)
        application.activate(ignoringOtherApps: true)
        let alert = NSAlert()
        alert.alertStyle = .critical
        alert.messageText = "terebi could not start"
        alert.informativeText = message
        alert.addButton(withTitle: "Quit")
        alert.runModal()
        exit(69)
    }
}