using UnityEngine;
using UnityEngine.InputSystem;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class UnitSelection : MonoBehaviour
    {
        #region Property and variable
        
        [Tooltip("선택된 부대")]
        [field: SerializeField] public UnitController SelectedUnitController { get; private set; }

        [SerializeField] private LayerMask unitLayer;
        [SerializeField] private LayerMask groundLayer;

        private UnitController previousUnitController;
        private Camera mainCamera;

        #endregion

        #region Unity built-in function

        private void Reset()
        {
            unitLayer = LayerMask.GetMask("Pirate");
            groundLayer = LayerMask.GetMask("Ground");
        }

        private void Awake()
        {
            var controls = new BlueWater();

            controls.Unit.LeftClick.performed += OnLeftClick;
            controls.Unit.RightClick.performed += OnRightClick;
            controls.Enable();
            
            unitLayer = LayerMask.GetMask("Pirate");
            groundLayer = LayerMask.GetMask("Ground");
            
            mainCamera = Camera.main;
        }

        #endregion

        #region New input system

        private void OnLeftClick(InputAction.CallbackContext context)
        {
            if (!context.performed) return;

            var ray = mainCamera.ScreenPointToRay(Mouse.current.position.ReadValue());

            // 부대를 클릭 했을 때,
            if (Physics.Raycast(ray, out var hit, Mathf.Infinity, unitLayer))
            {
                var unitController = hit.collider.transform.parent.GetComponent<UnitController>();
                if (unitController == null) return;

                // 선택된 부대가 없었을 때,
                if (SelectedUnitController == null)
                {
                    foreach (var soldier in unitController.unit.UnitList)
                    {
                        soldier.SelectedHighlight();
                    }
                    
                    SelectedUnitController = unitController;
                    GameManager.Inst.SlowSpeedMode();
                }
                // 선택된 부대가 이미 선택된 부대일 때,
                else if (SelectedUnitController == unitController)
                {
                    foreach (var soldier in SelectedUnitController.unit.UnitList)
                    {
                        soldier.ResetHighlight();
                    }

                    SelectedUnitController = null;
                    GameManager.Inst.DefaultSpeedMode();
                }
                // 다른 부대가 선택될 때,
                else
                {
                    foreach (var soldier in unitController.unit.UnitList)
                    {
                        soldier.SelectedHighlight();
                    }
                    
                    foreach (var soldier in SelectedUnitController.unit.UnitList)
                    {
                        soldier.ResetHighlight();
                    }

                    SelectedUnitController = unitController;
                }
            }
            // 부대를 클릭하지 않았을 때,
            else
            {
                // 선택된 부대가 없었을 때,
                if (SelectedUnitController == null) return;
                
                // 선택된 부대가 있었을 때,
                foreach (var soldier in SelectedUnitController.unit.UnitList)
                {
                    soldier.ResetHighlight();
                }
                
                SelectedUnitController = null;
                GameManager.Inst.DefaultSpeedMode();
            }
        }

        private void OnRightClick(InputAction.CallbackContext context)
        {
            if (!context.performed || SelectedUnitController == null) return;

            var ray = mainCamera.ScreenPointToRay(Mouse.current.position.ReadValue());

            if (Physics.Raycast(ray, out var hit, Mathf.Infinity, groundLayer))
            {
                var targetPos = hit.point;
                SelectedUnitController.MoveCommand(targetPos);
            }

            foreach (var soldier in SelectedUnitController.unit.UnitList)
            {
                soldier.ResetHighlight();
            }
            
            SelectedUnitController = null;
            GameManager.Inst.DefaultSpeedMode();
        }
        
        #endregion
    }
}