using System;
using System.Collections.Generic;
using TGS;
using UnityEngine;

namespace Gameplay.LegionBattle.View
{
    public class FightLineControl2 : MonoBehaviour
    {

        public Transform m_unitsParent;

        public TerrainGridSystem m_tgs;

        public GameObject m_samplePoint;
        
        public Camera m_mainCamera;
        
        private List<FightLineStandUnit2> _totalUnits;
        private FightLineMap2 _fightLineMap;
        
        public static FightLineControl2 instance;

        private void Start()
        {
            instance = this;
            
            _totalUnits = new List<FightLineStandUnit2>();
            for (int i = 0; i < m_unitsParent.childCount; i++)
            {
                var unit = m_unitsParent.GetChild(i).GetComponent<FightLineStandUnit2>();
                if (unit != null)
                {
                    _totalUnits.Add(unit);
                }
            }
            
            _fightLineMap = new FightLineMap2(m_tgs);
            _fightLineMap.CreateView(m_samplePoint);

            for (int i = 0; i < _totalUnits.Count; i++)
            {
                var unit = _totalUnits[i];
                unit.Init();
            }
            
            _fightLineMap.Init(_totalUnits);
            _fightLineMap.UpdateColor();
        }

        private void OnDestroy()
        {
            _fightLineMap.DestroyView();
        }
        
        private Vector3 _GetClickWorldPoint(Vector2 mousePos)
        {
            var ray = m_mainCamera.ScreenPointToRay(mousePos);
            Physics.Raycast(ray, out RaycastHit hit);
            var worldPos = hit.point;
            return worldPos;
        }

        private FightLineStandUnit2 _selectUnit;
        private void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                var mousePos = Input.mousePosition;
                var worldPos = _GetClickWorldPoint(mousePos);
                var getCell = m_tgs.CellGetAtPosition(worldPos, true);
                if (getCell != null)
                {
                    var cellIndex = getCell.index;
                    _HandleClickCellIndex(cellIndex);
                }
            }
            
            var isMoved = false;
            for (int i = 0; i < _totalUnits.Count; i++)
            {
                var unit = _totalUnits[i];
                unit.ViewUpdate(Time.deltaTime);
                isMoved = unit.isPosChanged || isMoved;
                unit.isPosChanged = false;
            }
            if (isMoved)
            {
                _fightLineMap.UpdateStandMap(_totalUnits);
                _fightLineMap.UpdateColor();
                _fightLineMap.UpdateAreas();
                _fightLineMap.ReverseAloneArea();
            }
        }

        private void _HandleClickCellIndex(int cellIndex)
        {
            if (_selectUnit == null)
            {
                _selectUnit = _GetStandUnit(cellIndex);
            }
            else
            {
                if (cellIndex == _selectUnit.standCellIndex) return;
                var worldPos = m_tgs.CellGetPosition(cellIndex);
                _selectUnit.MoveTo(worldPos);
                _selectUnit = null;
            }
        }

        private FightLineStandUnit2 _GetStandUnit(int cellIndex)
        {
            for (int i = 0; i < _totalUnits.Count; i++)
            {
                var unit = _totalUnits[i];
                if (unit.isBuild) continue;
                if (unit.standCellIndex == cellIndex) return unit;
            }
            return null;
        }

    }
}