using System.Threading;
using System.Threading.Tasks;
using Microsoft.Bot.Builder.Scorables.Internals;
using Microsoft.Bot.Connector;
using Microsoft.Bot.Builder.Internals.Fibers;
using Microsoft.Bot.Builder.Dialogs.Internals;
using System;
using Bayteq.BotServer.Core.Conversation.Dialogs;
using Microsoft.Bot.Builder.Dialogs;
using Bayteq.Infrastructure.SpellCheck;

namespace Bayteq.BotServer.Core.Conversation.Scorables
{
    [Serializable]
    class SpellCheckScorable : ScorableBase<IActivity, string, double>
    {
        private readonly IDialogTask task;
        private string original;

        public SpellCheckScorable(IMessageActivity activity)
        {
            SetField.NotNull(out this.task, nameof(task), task);
        }

        protected override Task DoneAsync(IActivity item, string correction, CancellationToken token)
        {
            return Task.CompletedTask;
        }

        protected override double GetScore(IActivity item, string correction)
        {
            return original != correction ? 1 : 0;
        }

        protected override bool HasScore(IActivity item, string correction)
        {
            return original != correction;
        }

        protected override async Task PostAsync(IActivity item, string correction, CancellationToken token)
        {
            var spellCheckDialog = new SpellCheckDialog(original, correction);
            var interruption = spellCheckDialog.Void<string, IMessageActivity>();
            task.Call(interruption, null);
            await task.PollAsync(token);
        }


        protected override async Task<string> PrepareAsync(IActivity item, CancellationToken token)
        {
            original = item.AsMessageActivity().Text;
            return await SpellCheck.SpellCheckAsync(item.AsMessageActivity().Text);
        }
    }
}