using System;
using System.Threading;
using System.Threading.Tasks;

using UnityEngine;

namespace Crowdin.Plugin.Helpers
{
    public static class TaskExtensions
    {
        /// Starts a fire-and-forget task from a synchronous entry point (button click, editor callback)
        /// and logs any fault to the Console. Unity does not surface unobserved Task exceptions, so
        /// discarding a Task with `_ = ...` silently swallows everything the method itself doesn't catch.
        public static void Forget(this Task task)
        {
            if (task is null)
            {
                return;
            }

            if (task.IsCompleted)
            {
                LogFault(task);
                return;
            }

            task.ContinueWith(
                LogFault,
                CancellationToken.None,
                TaskContinuationOptions.OnlyOnFaulted | TaskContinuationOptions.ExecuteSynchronously,
                TaskScheduler.Default);
        }

        private static void LogFault(Task task)
        {
            if (task.Exception is null)
            {
                return;
            }

            foreach (Exception exception in task.Exception.Flatten().InnerExceptions)
            {
                Debug.LogException(exception);
            }
        }
    }
}