namespace Yuuna.Contracts.Plugins
{
    using System;
    using System.Collections.Generic;
    using System.Collections.Immutable;
    using System.Linq;
    using System.Runtime.CompilerServices;
    using System.Text;
    using Yuuna.Contracts.Interaction;
    using Yuuna.Contracts.Optimization;
    using Yuuna.Contracts.Patterns;
    using Yuuna.Contracts.Semantics;
    using Yuuna.Contracts.TextSegmention;
    using Yuuna.Contracts.Utilities;

    public sealed class Fake : PluginBase
    {
        protected override void BuildPatterns(IGroupManager g, IPatternBuilder p)
        { 
            g.Define("open").AppendOrCreate(new[] { "打開", "開" });
            g.Define("door").AppendOrCreate(new[] { "門", "房間門" });
            g.Define("light").AppendOrCreate(new[] { "燈", "檯燈" });
            //g.Define("browser").AppendOrCreate(new[] { "瀏覽器", "chrome" });

            p.Build(g["open"], g["door"]).OnInvoke(score =>
            {
                var DOOR = new { IS_OPENED = new[] { true, false, true, false }.RandomTakeOne() };
                // 開門
                if (!DOOR.IS_OPENED)
                    return (Moods.Happy, "已經開好門囉 <3");
                else
                    return (Moods.Sad, "可是門本來就是開的欸 QAQ");  
            });

            p.Build(g["open"], g["light"]).OnInvoke(score =>
            {
                var LIGHT = new { IS_OPENED = new[] { true, false,true,false }.RandomTakeOne() };
                // 開門
                if (!LIGHT.IS_OPENED)
                    return (Moods.Happy, "已經開好燈囉 <3");
                else
                    return (Moods.Sad, "可是燈本來就是開的欸 QAQ");
            });

            //p.Build(g["open"], g["browser"]).OnInvoke(score =>
            //{
            //    var DOOR = new { IS_OPENED = true };
            //    // 開門
            //    if (!DOOR.IS_OPENED)
            //        return (Moods.Happy, "已經開好門囉 <3");
            //    else
            //        return (Moods.Sad, "可是門本來就是開的欸 QAQ");
            //});
        }
    }


    public class PluginHub
    {
        public PluginHub()
        {

        }



        public static void Main(string[] args)
        {
            // Send("打開門");
            // Send("開燈");
            // Send("打開燈"); 
        }

        public static void Send(string text)
        {
            ITextSegmenter segmenter = new JiebaTextSegmenter();
            var allPlugins = new PluginBase[] { new Fake() };
            foreach (var item in allPlugins)
            {
                item.Initialize(segmenter);
                Console.WriteLine("已載入模組: "+item.GetType().AssemblyQualifiedName);
            }

            Console.WriteLine("我: " + text);
            var cutted = segmenter.Cut(text);
            Console.WriteLine($"來自分詞器 {segmenter.Name} 的分詞結果: [ {string.Join(", ",cutted)} ]");
            var strategy = new DefaultStrategy();
            var list = new List<IScore>();
            foreach (var p in allPlugins) 
                list.AddRange(p.Evaluate(strategy, cutted));
            list.Sort(ScoreComparer.Default);

            var sb = new StringBuilder("Bot: ");
            var best = list.LastOrDefault();
            if (best is null)
                sb.Append("我不懂你的意思");
            else if (best.IsCompacted)
            {
                var resp = best.Plugin.SelectBest(best).Invoke(best);
                Console.WriteLine(   resp.Mood.ToString());
                sb.Append(resp.Message);
            }
            else
            {
                var choices = list.Where(s => s.Missing.Count <= 1).ToImmutableArray();
                switch (choices.Length)
                {
                    case 1:
                        {
                            sb.Append("你" + new[] { "是想", "想要" }.RandomTakeOne() + " ");
                            sb.Append(choices.Select(x => x.Contrast.ToImmutable().Aggregate(string.Empty, (s, g) => s += g.ToImmutable().RandomTakeOne().ToImmutable().RandomTakeOne())));
                            sb.Append(" 嗎?");
                        }
                        break;


                    case 2:
                        {
                            sb.Append("你" + new[] { "是想", "想要" }.RandomTakeOne() + " ");
                            sb.AppendJoin(" 還是 ", choices.Select(x => x.Contrast.ToImmutable().Aggregate(string.Empty, (s, g) => s += g.ToImmutable().RandomTakeOne().ToImmutable().RandomTakeOne())));
                            sb.Append(" ?");
                        }
                        break;


                    default:
                        sb.Append("我不太清楚你想做什麼");
                        break;
                }
            }

            Console.WriteLine(sb);

        }
    }

    public abstract class PluginBase
    {
        private readonly PatternBuilder _grammarSet;
        private readonly GroupManager _groupManager;
         

        public PluginBase()
        {
            this._grammarSet = new PatternBuilder();
            this._groupManager = new GroupManager();
        }

        protected virtual void PreInitialize(ITextSegmenter segmenter)
        { 
        }

        internal void Initialize(ITextSegmenter textSegmenter)
        {
            this.PreInitialize(textSegmenter);
            this.BuildPatterns(this._groupManager, this._grammarSet);
            textSegmenter.Load(this._groupManager);
            this.OnInitialize();
        }
        protected virtual void OnInitialize()
        {
        }

        protected abstract void BuildPatterns(IGroupManager groupManager, IPatternBuilder grammarBuilder);

        internal IImmutableList<IScore> Evaluate(StrategyBase strategy, IImmutableList<string> cutted)
        {
            return strategy.Assess(this, cutted, this._grammarSet);
        }

        internal Behaviour SelectBest(IScore score)
        {
            return this._grammarSet.TryGet(score.Contrast, out var b) ? b : null;
        }
    }

}