using CW.Common;
using PaintCore;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

namespace game
{
    [RequireComponent(typeof(CwHitPointers))]
    public class BrushPointerMouse : CwPointer
    {
        public Vector2 Offset { set { offset = value; } get { return offset; } }
        [SerializeField] private Vector2 offset = Vector2.zero;

        /// <summary>If you enable this, then a paint preview will be shown under the mouse as long as the <b>RequiredKey</b> is not pressed.</summary>
		public bool Preview { set { preview = value; } get { return preview; } }
        [SerializeField] private bool preview;

        /// <summary>This component will paint while any of the specified mouse buttons or keyboard keys are held.</summary>
        public List<KeyCode> Keys { get { if (keys == null) { keys = new List<KeyCode>(); } return keys; } }
        [SerializeField] private List<KeyCode> keys;

        private readonly int PREVIEW_FINGER_INDEX = -1;

        private readonly int PAINT_FINGER_INDEX = 1;

        [System.NonSerialized]
        private bool oldHeld;

        public bool TryAddKey(KeyCode key)
        {
            if (Keys.Contains(key) == false)
            {
                keys.Add(key);

                return true;
            }

            return false;
        }

        public bool GetKeyHeld()
        {
            if (keys != null)
            {
                foreach (var key in keys)
                {
                    if (CwInput.GetKeyIsHeld(key) == true)
                    {
                        return true;
                    }
                }
            }

            return false;
        }

#if UNITY_EDITOR
        protected virtual void Reset()
        {
            if (keys == null)
            {
                keys = new List<KeyCode>();
            }
            else
            {
                keys.Clear();
            }

            keys.Add(KeyCode.Mouse0);
        }
#endif

        protected virtual void Update()
        {
            var newHeld = false;
            var enablePreview = false;
            var enablePaint = false;

            bool isFollowing = false;
            Vector2 screenPosition = Vector2.zero;

            if (CwInput.GetMouseExists() == true)
            {
                CwInputManager.Finger finger;

                newHeld = GetKeyHeld();
                enablePaint = newHeld == true || oldHeld == true;
                enablePreview = preview == true && enablePaint == false;

                Vector2 position = CwInput.GetMousePosition();
                position += offset * CwInputManager.ScaleFactor;

                if (enablePreview == true)
                {
                    GetFinger(PREVIEW_FINGER_INDEX, position, 1.0f, true, out finger);

                    cachedHitPointers.HandleFingerUpdate(finger, false, false);

                    screenPosition = position;
                    isFollowing = true;
                }

                if (enablePaint == true)
                {
                    if (EventSystem.current == null) return;

                    if (EventSystem.current.IsPointerOverGameObject()) return;

                    var down = GetFinger(PAINT_FINGER_INDEX, position, 1.0f, true, out finger);

                    cachedHitPointers.HandleFingerUpdate(finger, down, newHeld == false);

                    screenPosition = position;
                    isFollowing = true;
                }
            }

            if (isFollowing) FishingYachtAct.Publish<EventWashingGestureFollowPositionData>(new EventWashingGestureFollowPositionData(screenPosition, true));
            else FishingYachtAct.Publish<EventWashingGestureFollowPositionData>(new EventWashingGestureFollowPositionData(screenPosition, false));

            if (enablePreview == false)
            {
                TryNullFinger(PREVIEW_FINGER_INDEX);
            }

            if (enablePaint == false)
            {
                TryNullFinger(PAINT_FINGER_INDEX);
            }

            oldHeld = newHeld;
        }
    }
}