// OpenTween - Client of Twitter
// Copyright (c) 2012 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
// All rights reserved.
//
// This file is part of OpenTween.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>, or write to
// the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
// Boston, MA 02110-1301, USA.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Xunit;
using Xunit.Sdk;
using Xunit.Extensions;

namespace OpenTween
{
    class TestUtils
    {
        public static void CheckDeepCloning(object obj, object cloneObj)
        {
            Assert.Equal(obj, cloneObj);
            Assert.NotSame(obj, cloneObj);

            foreach (var field in obj.GetType().GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
            {
                var objValue = field.GetValue(obj);
                var cloneValue = field.GetValue(cloneObj);

                Assert.Equal(objValue, cloneValue);
                if (objValue == null && cloneValue == null) continue;
                if (field.FieldType.IsValueType || field.FieldType == typeof(string)) continue;

                Assert.NotSame(objValue, cloneValue);
            }
        }

        public static void FireEvent<T>(T control, string eventName) where T : Control
        {
            TestUtils.FireEvent(control, eventName, EventArgs.Empty);
        }

        public static void FireEvent<T>(T control, string eventName, EventArgs e) where T : Control
        {
            var methodName = "On" + eventName;
            var method = typeof(T).GetMethod(methodName, BindingFlags.Instance | BindingFlags.NonPublic);

            method.Invoke(control, new[] { e });
        }

        public static async Task<T> ThrowsAsync<T>(Func<Task> testCode) where T : Exception
        {
            var expectedType = typeof(T);
            Exception exception = null;

            try
            {
                await testCode();
            }
            catch (Exception ex)
            {
                exception = ex;
            }

            if (exception == null)
                throw new ThrowsException(expectedType);

            if (!exception.GetType().Equals(expectedType))
                throw new ThrowsException(expectedType, exception);

            return (T)exception;
        }

        public static async Task<T> ThrowsAnyAsync<T>(Func<Task> testCode) where T : Exception
        {
            var expectedType = typeof(T);
            Exception exception = null;

            try
            {
                await testCode();
            }
            catch (Exception ex)
            {
                exception = ex;
            }

            if (exception == null)
                throw new ThrowsException(expectedType);

            if (!expectedType.IsAssignableFrom(exception.GetType()))
                throw new ThrowsException(expectedType, exception);

            return (T)exception;
        }
    }
}