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 bool IsSelectable { get; private set; } = true;
        [field: SerializeField] public PirateUnit SelectedPirateUnit { get; private set; }

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

        private PirateUnit previousUnitController;

        #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.SelectUnit.performed += OnSelectUnit;
            controls.Unit.CancelSelectedUnit.performed += OnCancelSelectedUnit;
            controls.Unit.MoveUnit.performed += OnMoveUnit;
            controls.Enable();
            
            unitLayer = LayerMask.GetMask("Pirate");
            groundLayer = LayerMask.GetMask("Ground");
            
        }

        #endregion

        #region New input system

        private void OnSelectUnit(InputAction.CallbackContext context)
        {
            if (!context.performed || !IsSelectable) return;

            var ray = CameraManager.Inst.MainCam.ScreenPointToRay(Mouse.current.position.ReadValue());

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

                // 선택된 부대가 없었을 때,
                if (SelectedPirateUnit == null)
                {
                    foreach (var pirateAi in pirateUnit.pirateUnitStat.PirateAiList)
                    {
                        pirateAi.SelectedHighlight();
                    }
                    
                    SelectedPirateUnit = pirateUnit;
                    GameManager.Inst.SlowSpeedMode();
                }
                // 선택된 부대가 이미 선택된 부대일 때,
                else if (SelectedPirateUnit == pirateUnit)
                {
                    foreach (var pirateAi in SelectedPirateUnit.pirateUnitStat.PirateAiList)
                    {
                        pirateAi.ResetHighlight();
                    }

                    SelectedPirateUnit = null;
                    GameManager.Inst.DefaultSpeedMode();
                }
                // 다른 부대가 선택될 때,
                else
                {
                    foreach (var pirateAi in pirateUnit.pirateUnitStat.PirateAiList)
                    {
                        pirateAi.SelectedHighlight();
                    }
                    
                    foreach (var pirateAi in SelectedPirateUnit.pirateUnitStat.PirateAiList)
                    {
                        pirateAi.ResetHighlight();
                    }

                    SelectedPirateUnit = pirateUnit;
                }
            }
            // 부대를 클릭하지 않았을 때,
            else
            {
                // 선택된 부대가 없었을 때,
                if (SelectedPirateUnit == null) return;
                
                // 선택된 부대가 있었을 때,
                foreach (var pirateAi in SelectedPirateUnit.pirateUnitStat.PirateAiList)
                {
                    pirateAi.ResetHighlight();
                }
                
                SelectedPirateUnit = null;
                GameManager.Inst.DefaultSpeedMode();
            }
        }

        private void OnCancelSelectedUnit(InputAction.CallbackContext context)
        {
            if (!context.performed || !IsSelectable || SelectedPirateUnit == null) return;
            
            foreach (var pirateAi in SelectedPirateUnit.pirateUnitStat.PirateAiList)
            {
                pirateAi.ResetHighlight();
            }

            SelectedPirateUnit = null;
            GameManager.Inst.DefaultSpeedMode();
        }

        private void OnMoveUnit(InputAction.CallbackContext context)
        {
            if (!context.performed || !IsSelectable || SelectedPirateUnit == null) return;

            var ray = CameraManager.Inst.MainCam.ScreenPointToRay(Mouse.current.position.ReadValue());

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

            foreach (var pirateAi in SelectedPirateUnit.pirateUnitStat.PirateAiList)
            {
                pirateAi.ResetHighlight();
            }
            
            SelectedPirateUnit = null;
            GameManager.Inst.DefaultSpeedMode();
        }
        
        #endregion
    }
}