using System;
using System.Collections.Generic;
using System.IO;

namespace ISphereWinHelper
{
    internal static class Program
    {
        [STAThread]
        private static int Main(string[] args)
        {
            string requestText = Console.In.ReadToEnd();
            Dictionary<string, object> request;
            string requestId = "";
            string op = "";

            if (!HelperProtocol.TryParseRequest(requestText, out request, out requestId, out op))
            {
                Console.WriteLine(HelperProtocol.ToJson(HelperProtocol.Failure(requestId, op, "INVALID_REQUEST", "request must be valid JSON object")));
                return 0;
            }

            try
            {
                Dictionary<string, object> opArgs = HelperProtocol.GetObject(request, "args");
                Dictionary<string, object> response;

                switch (op)
                {
                    case "version":
                        response = HelperProtocol.Success(requestId, op, VersionData());
                        break;
                    case "self_check":
                        response = HelperProtocol.Success(requestId, op, SelfCheckData());
                        break;
                    case "scan_windows":
                        response = HelperProtocol.Success(requestId, op, WindowScanner.Scan(opArgs));
                        break;
                    case "dump_uia":
                        response = UiaDumper.Dump(requestId, op, opArgs);
                        break;
                    default:
                        response = HelperProtocol.Failure(requestId, op, "UNSUPPORTED_OP", "unsupported op: " + op);
                        break;
                }

                Console.WriteLine(HelperProtocol.ToJson(response));
                return 0;
            }
            catch (Exception ex)
            {
                Console.Error.WriteLine(ex.ToString());
                Console.WriteLine(HelperProtocol.ToJson(HelperProtocol.Failure(requestId, op, "HELPER_FAILED", ex.Message)));
                return 0;
            }
        }

        private static Dictionary<string, object> VersionData()
        {
            return new Dictionary<string, object>
            {
                { "helper_name", "ISphereWinHelper" },
                { "helper_version", "0.1.0" },
                { "protocol", HelperProtocol.Protocol },
                { "runtime", ".NET Framework " + Environment.Version }
            };
        }

        private static Dictionary<string, object> SelfCheckData()
        {
            bool uiaAvailable;
            try
            {
                uiaAvailable = System.Windows.Automation.AutomationElement.RootElement != null;
            }
            catch
            {
                uiaAvailable = false;
            }

            return new Dictionary<string, object>
            {
                { "desktop_access", Environment.UserInteractive },
                { "uia_available", uiaAvailable }
            };
        }
    }
}