import Foundation

/// ScriptHelper is a helper for invoking AppleScript.
enum ScriptHelper {
    
    /// Execute an AppleScript via osascript with the provided arguments.
    /// Returns the output or throws an error.
    @discardableResult
    static func runAppleScript(_ script: String, arguments: [String]) async throws -> String {
        try await Task.detached(priority: .userInitiated) {
            let task = Process()
            task.launchPath = "/usr/bin/osascript"
            
            var args = ["-e", script]
            args.append(contentsOf: arguments)
            task.arguments = args
            
            let stdoutPipe = Pipe()
            let stderrPipe = Pipe()
            task.standardOutput = stdoutPipe
            task.standardError = stderrPipe
            
            try task.run()
            task.waitUntilExit()
            
            let stdout = self.readAsString(stdoutPipe)
            let stderr = self.readAsString(stderrPipe)

            print("AppleScript output: status=\(task.terminationStatus), stdout=\(stdout), stderr=\(stderr)")
            
            if task.terminationStatus != 0 {
                let errorMessage = stderr.isEmpty ? "Unknown AppleScript execution error." : "AppleScript execution error: \(stderr)"
                throw NSError(
                    domain: "ScriptHelperDomain",
                    code: Int(task.terminationStatus),
                    userInfo: [NSLocalizedDescriptionKey: errorMessage]
                )
            }
            
            return stdout
        }.value
    }
    
    private static func readAsString(_ p: Pipe) -> String {
        let data = p.fileHandleForReading.readDataToEndOfFile()
        guard let output = String(data: data, encoding: .utf8) else {
            return ""
        }
        
        return output.trimmingCharacters(in: .whitespacesAndNewlines)
    }
}