import Foundation
import LanguageServerProtocol

extension NSError {
    static func from(_ error: Error) -> NSError {
        if let error = error as? ServerError {
            var message = "Unknown"
            switch error {
            case let .handlerUnavailable(handler):
                message = "Handler unavailable: \(handler)."
            case let .unhandledMethod(method):
                message = "Methond unhandled: \(method)."
            case let .notificationDispatchFailed(error):
                message = "Notification dispatch failed: \(error.localizedDescription)."
            case let .requestDispatchFailed(error):
                message = "Request dispatch failed: \(error.localizedDescription)."
            case let .clientDataUnavailable(error):
                message = "Client data unavailable: \(error.localizedDescription)."
            case .serverUnavailable:
                message = "Server unavailable, please make sure you have installed Node."
            case .missingExpectedParameter:
                message = "Missing expected parameter."
            case .missingExpectedResult:
                message = "Missing expected result."
            case let .unableToDecodeRequest(error):
                message = "Unable to decode request: \(error.localizedDescription)."
            case let .unableToSendRequest(error):
                message = "Unable to send request: \(error.localizedDescription)."
            case let .unableToSendNotification(error):
                message = "Unable to send notification: \(error.localizedDescription)."
            case let .serverError(code, m, _):
                message = "Server error: (\(code)) \(m)."
            case let .invalidRequest(error):
                message = "Invalid request: \(error?.localizedDescription ?? "Unknown")."
            case .timeout:
                message = "Timeout."
            }
            return NSError(domain: "com.intii.CopilotForXcode", code: -1, userInfo: [
                NSLocalizedDescriptionKey: message,
            ])
        }
        if let error = error as? CancellationError {
            return NSError(domain: "com.intii.CopilotForXcode", code: -100, userInfo: [
                NSLocalizedDescriptionKey: error.localizedDescription,
            ])
        }
        return NSError(domain: "com.intii.CopilotForXcode", code: -1, userInfo: [
            NSLocalizedDescriptionKey: error.localizedDescription,
        ])
    }
}