using System;
using System.Collections.Generic;
using System.Linq;
using IwbZero.Expr;
using IwbZero.ToolCommon.StringModel;
using WeEngine.Enum;
using WeEngine.Packages;

namespace WeEngine.Functions
{
    /// <summary>
    /// 随机选择情景流块
    /// </summary>
    public class RandomSelectFlowBlock : RunTimeBase,IFunction
    {
        public string Invoke(ExprObject exprObj)
        {
            var child = exprObj.GetChild(0);
            GetPackage(child.Expr);
            Select();
            return "TRUE";
        }
        private void Select()
        {
            var list = Rp.CurRoundInfo.Children.Select(a => (SceneFlowBlock)a).Where(a => a.BlockType == SceneFlowBlockType.Evolutionary).ToList();
            SceneFlowBlock selectBlock = list.FirstOrDefault();
            if (list.Count>1)
            {
                var randomResult = ExprModule.Evaluate($"IFunRandomSelection({Rp.CurRoundInfo.ControlRate})");
                if (randomResult.ValB())
                {
                    selectBlock =
                        list.FirstOrDefault(a => a.NodeState == NodeState.Running);
                }
                else
                {
                    var noRunBlock = list.Where(a => a.NodeState == NodeState.New).ToList();
                    if (noRunBlock.Any())
                    {
                        var random = new Random().Next(0, noRunBlock.Count - 1);
                        selectBlock = noRunBlock[random];
                    }
                }
            }
            
            if (selectBlock != null)
            {
                var sceneCount = Rp.CurRoundInfo.SceneCount;
                var flows = new List<NodeBase>();

                flows.AddRange(selectBlock.Children);
                sceneCount = sceneCount > flows.Count ? flows.Count : sceneCount;
                while (sceneCount > 0)
                {
                    var id = SelectFlows(ref flows);
                    var flow = selectBlock.Children.FirstOrDefault(a => a.Id == id);
                    if (flow != null) flow.NodeState = NodeState.Running;
                    sceneCount--;
                }
            }
        }


        private string SelectFlows(ref List<NodeBase> flows)
        {
            var random = new Random().Next(0, flows.Count - 1);
            var flow = flows[random];
            flows.Remove(flow);
            return flow.Id;

        }
    }
}