using System;
using System.IO;
using System.Threading;
using System.Windows.Forms;

namespace EveOPreview {
    // A really very primitive exception handler stuff here
    // No IoC, no fancy DI containers - just a plain exception stacktrace dump
    // If this code is called then something was gone really bad
    // so even the DI infrastructure might be dead already.
    // So this dumb and non elegant approach is used
    sealed class ExceptionHandler {
        private const string EXCEPTION_DUMP_FILE_NAME = "EVE-O-Preview.log";
        private const string EXCEPTION_MESSAGE =
            "EVE-O-Preview has encountered a problem and needs to close. Additional information has been saved in the crash log file.";

        public void SetupExceptionHandlers() {
            if (System.Diagnostics.Debugger.IsAttached) {
                return;
            }

            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
            Application.ThreadException += delegate(Object sender, ThreadExceptionEventArgs e) {
                this.ExceptionEventHandler(e.Exception);
            };

            AppDomain.CurrentDomain.UnhandledException += delegate(Object sender, UnhandledExceptionEventArgs e) {
                this.ExceptionEventHandler(e.ExceptionObject as Exception);
            };
        }

        private void ExceptionEventHandler(Exception exception) {
            try {
                String exceptionMessage = exception.ToString();
                File.WriteAllText(ExceptionHandler.EXCEPTION_DUMP_FILE_NAME, exceptionMessage);

                MessageBox.Show(ExceptionHandler.EXCEPTION_MESSAGE, @"EVE-O-Preview", MessageBoxButtons.OK,
                                MessageBoxIcon.Error);
            } catch {
                // We are in unstable state now so even this operation might fail
                // Still we actually don't care anymore - anyway the application has been cashed
            }

            System.Environment.Exit(1);
        }
    }
}