using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using KairoEngine.GameTools.InteractionTools;
using Sirenix.OdinInspector;
using KairoEngine.UI;

namespace KairoEngine.GameTools.Selectables
{
    /// <summary>
    /// The selectableObject tools controls input for selecting objects in the game and visualizing its properties and actions.
    /// </summary>
    public class SelectableObjectTool : MonoBehaviour, IInteractionTool
    {
        public bool allowMultiSelection = true;
        public KeyCode multiSelectionKey = KeyCode.LeftControl;
        public LayerMask layerMask;
        public bool selectableObjectToolEnabled = true;

        [ShowInInspector, ReadOnly] public List<SelectableObjectTrigger> selectedObjects = new List<SelectableObjectTrigger>();

        private void Update()
        {
            SelectObjects();
        }

        public void DisableTool()
        {
            selectableObjectToolEnabled = false;
        }

        public void EnableTool()
        {
            selectableObjectToolEnabled = true;
        }

        private void SelectObjects()
        {
            actionListChanged = false;
            if(!selectableObjectToolEnabled) return;
            if(Input.GetMouseButtonDown(0) && !MouseInputUIBlocker.BlockedByUI)
            {
                if(Camera.main == null) return;
                Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                if(Physics.Raycast(ray, out RaycastHit raycastHit, 999f, layerMask))
                {
                    var selectableObjectTrigger = raycastHit.collider.gameObject.GetComponent<SelectableObjectTrigger>();
                    if(selectableObjectTrigger != null)
                    {
                        if(allowMultiSelection && Input.GetKey(multiSelectionKey)) AddToSelection(selectableObjectTrigger);
                        else 
                        {
                            ClearSelection();
                            AddToSelection(selectableObjectTrigger);
                        }
                    }
                }
            }
        }

        public void AddToSelection(SelectableObjectTrigger selectableObjectTrigger)
        {
            bool alreadySelected = false;
            for (int i = 0; i < selectedObjects.Count; i++)
            {
                if(selectedObjects[i] == selectableObjectTrigger) alreadySelected = true;
            }
            if(alreadySelected == false) 
            {
                selectableObjectTrigger.Select();
                selectedObjects.Add(selectableObjectTrigger);
            }
            else
            {
                selectableObjectTrigger.Deselect();
                selectedObjects.Remove(selectableObjectTrigger);
            }
            actionListChanged = true;
        }

        public void ClearSelection()
        {
            for (int i = 0; i < selectedObjects.Count; i++)
            {
                if(selectedObjects[i] != null) selectedObjects[i].Deselect();
            }
            selectedObjects.Clear();
            actionListChanged = true;
        }

        public bool ActionListChanged() => actionListChanged;
        private bool actionListChanged = false;

        public List<SelectableObjectAction> GetActions()
        {
            List<SelectableObjectAction> actions = new List<SelectableObjectAction>();
            for (int i = 0; i < selectedObjects.Count; i++)
            {
                if(selectedObjects[i].selectableObject == null) continue;
                if(selectedObjects[i].selectableObject.actions == null) continue;
                for (int a = 0; a < selectedObjects[i].selectableObject.actions.Count; a++)
                {
                    bool duplicate = false;
                    for (int v = 0; v < actions.Count; v++)
                    {
                        if(actions[v].title == selectedObjects[i].selectableObject.actions[a].title) duplicate = true;
                    }
                    if(!duplicate) actions.Add(selectedObjects[i].selectableObject.actions[a]);
                }
            }
            return actions;
        }

        public void ExecuteAction(SelectableObjectAction action)
        {
            for (int i = 0; i < selectedObjects.Count; i++)
            {
                if(selectedObjects[i].selectableObject == null) continue;
                if(selectedObjects[i].selectableObject.actions == null) continue;
                for (int a = 0; a < selectedObjects[i].selectableObject.actions.Count; a++)
                {
                    if(selectedObjects[i].selectableObject.actions[a].title == action.title)
                    {
                        selectedObjects[i].selectableObject.ExecuteAction(action);
                    }
                }
            }
        }
    }
}