using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using XED.VirtualFactory;

namespace XED
{
    public class VirtualFactoryManager : MonoBehaviour
    {
        public List<StackerCrane> stackerCranes = new();
        public AGVManager agvManager;
        public AGVMap agvMap;
        public PortMap portMap;
        public List<Product> loads = new();
        public Product prf_Load;
        public AGVNode startNode;

        public bool stackerHasEmptyCell;
        public int maxAGVCount = 4;
        public enum FactoryNeeds
        {
            NeedAGV,
            NeedLoad,
            NeedStackerInputLoad,
            NeedStackerInput,
        }

        public bool agvIsLack;
        public bool loadIsLack;
        public List<FactoryNeeds> needs = new();
        public event Action scanningAction;
        public event Action solutionAction;
        public override void AfterAwake()
        {
            agvMap = FindSingle<AGVMap>();
            portMap = FindSingle<PortMap>();
            agvManager = FindSingle<AGVManager>();
            stackerCranes = FindObjectsByType<StackerCrane>(UnityEngine.FindObjectsSortMode.None).ToList();
            
            scanningAction += CheckAGVCount;
            scanningAction += CheckStackerSpace;
            scanningAction += CheckStackerInput;
        }

        private void CheckStackerInput()
        {
            foreach (var stacker in stackerCranes)
            {
                if (!stacker.hasEmptyCell)
                    continue;

                if (stacker.inputPort.isEmpty)
                {
                        Debug.Log("Need Stacker Input Load");
                        needs.Add(FactoryNeeds.NeedStackerInputLoad);
                    return;
                }

                Debug.Log($"Need Stacker Input");
                needs.Add(FactoryNeeds.NeedStackerInput);
                return;
            }

        }

        private void Update()
        {
            ScanningVirtualFactory();
            Solutioning();
        }

        void ScanningVirtualFactory()
        {
            scanningAction?.Invoke();
        }

        void Solutioning()
        {
            foreach(var n in needs)
            {
                switch (n)
                {
                    case FactoryNeeds.NeedAGV:
                        solutionAction += GenerateAGV;
                        break;
                    case FactoryNeeds.NeedLoad:
                        solutionAction += GenerateLoad;
                        break;
                    case FactoryNeeds.NeedStackerInputLoad:
                        solutionAction += DeliveryStackerInputLoad;
                        break;
                }
            }
            solutionAction?.Invoke();
            solutionAction = null;
            needs.Clear();
        }

        private void DeliveryStackerInputLoad()
        {
            if (!agvManager.TryGetIdleAGV(out var agvWorker))
            {
                return;
            }

            if(!portMap.TryGetFullGeneratePort(out var generatePort))
            {
                return;
            }

            if(!agvMap.TryGetEmptyInputPortNode(out var inputPortNode))
            {
                return;
            }

            var startNode = agvWorker.currentNode;
            var generateNode = generatePort.GetComponent<AGVNode>();
            var getLoadPath = agvMap.FindPath(startNode, generateNode);
            var inputLoadPath = agvMap.FindPath(generateNode, inputPortNode);
            agvWorker.AddAction(new AGVMoveAction(getLoadPath));
            agvWorker.AddAction(new AGVLoadAction(generatePort));
            agvWorker.AddAction(new AGVMoveAction(inputLoadPath));
            agvWorker.AddAction(new AGVUnloadAction(inputPortNode.loader));
        }

        private void GenerateLoad()
        {
            if(portMap.TryGetEmptyGeneratePort(out var port))
            {
                Debug.Log($"GenerateLoad");
                var newLoad = Instantiate(prf_Load);
                port.Load(newLoad);
                loads.Add(newLoad);
            }
        }

        private void GenerateAGV()
        {
            Debug.Log($"GenerateAGV");
            var newAGV = agvManager.CreateEmptyAGV();
            newAGV.ForceSet(startNode);
        }

        void CheckStackerSpace()
        {
            if (stackerCranes.Sum(sc => sc.cells.Count()) == loads.Count)
                return;

            foreach (var stacker in stackerCranes)
            {
                if (stacker.hasEmptyCell)
                {
                    Debug.Log($"Need Stacker Load");
                    needs.Add(FactoryNeeds.NeedLoad);
                    return;
                }
            }
        }

        void CheckAGVCount()
        {
            Debug.Log($"CheckAGVCount");
            if (maxAGVCount > agvManager.agvs.Count)
            {
                needs.Add(FactoryNeeds.NeedAGV);
            }
            else
            {
                scanningAction -= CheckAGVCount;
            }
        }
    }
}