import Foundation

enum SystemTheme {
    static func toggle() async throws {
        try await Task.detached {
            guard let script = NSAppleScript(source: """
                tell application "System Events"
                    tell appearance preferences
                        set dark mode to not dark mode
                    end tell
                end tell
                """) else {
                throw NSError(domain: "Conjure.SystemTheme", code: 1, userInfo: [
                    NSLocalizedDescriptionKey: "Couldn’t create the system appearance script.",
                ])
            }
            var error: NSDictionary?
            script.executeAndReturnError(&error)
            if let error {
                let code = error[NSAppleScript.errorNumber] as? Int ?? 1
                let message = code == -1743
                    ? "Allow Conjure to control System Events in System Settings → Privacy & Security → Automation, then try again."
                    : error[NSAppleScript.errorMessage] as? String ?? "macOS couldn’t change the system appearance."
                throw NSError(domain: "Conjure.SystemTheme", code: code, userInfo: [NSLocalizedDescriptionKey: message])
            }
        }.value
    }
}