using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

namespace Golems
{
    /// <summary>
    /// Ghost Object Behaviour sends all attached renderers via the AlbertGhostMemory effect
    /// NOTE:
    /// This is ExecuteInEditMode so that in the effect is visible in Editor at edit time. This
    /// helps Timeline authoring and similar as the alpha changes will be visible.
    /// </summary>
    [ExecuteInEditMode]
    public class GhostObjectBehaviour : MonoBehaviour
    {
        private static SRDebuggerGhostAreRealSetting m_SRDebuggerGhostAreRealSettingInstance = null;

        /// <summary>
        /// Global Alpha applied to all the renders attached
        /// to this behaviour. This is applied POST drawing
        /// everything so no clipping through meshes
        /// N.B Variable is serialized to allow setting it, but requires public controller to be set via animations
        /// </summary>
        [SerializeField]
        [Range(0f,1f)]
        private float m_Alpha = 1.0f;
        public float Alpha => m_Alpha;

        /// <summary>
        /// Flag to ignore the Global Alpha driven via the
        /// Alert Ghost Memory effect Settings. Will use m_Alpha if true
        /// </summary>
        [SerializeField] 
        private bool m_IgnoreGlobalAlpha = false;
        public bool IgnoreGlobalAlpha => m_IgnoreGlobalAlpha;

        /// <summary>
        /// Really this should now just be m_Renderers..
        /// See docs for GhostObject
        /// </summary>
        [SerializeField] 
        private GhostObject m_GhostObject = new GhostObject();
        public GhostObject GhostObject => m_GhostObject;
        
        [SerializeField] 
        private List<Material> m_ReplacementMemoryMaterials;
        public List<Material> ReplacementMemoryMaterials => m_ReplacementMemoryMaterials;
        
        private void OnEnable()
        {
            
            GhostObjectCollection.Instance.AddGhostObjectBehaviour(this);
        }

        private void Start()
        {
            
            if (m_SRDebuggerGhostAreRealSettingInstance == null)
            {
                m_SRDebuggerGhostAreRealSettingInstance = new SRDebuggerGhostAreRealSetting();
            }

            if (m_SRDebuggerGhostAreRealSettingInstance != null)
            {
                m_SRDebuggerGhostAreRealSettingInstance.MakeGhostsGhosty += MakeGhostGhosty;
                m_SRDebuggerGhostAreRealSettingInstance.MakeGhostsReal += MakeGhostReal;

                if (m_SRDebuggerGhostAreRealSettingInstance.GetGhostsGhosty())
                {
                    MakeGhostGhosty();
                }
                else
                {
                    MakeGhostReal();
                }
            }
        }

        private void OnDestroy()
        {
            if (m_SRDebuggerGhostAreRealSettingInstance != null)
            {
                m_SRDebuggerGhostAreRealSettingInstance.MakeGhostsGhosty -= MakeGhostGhosty;
                m_SRDebuggerGhostAreRealSettingInstance.MakeGhostsReal -= MakeGhostReal;
            }
        }

        private void OnDisable()
        {

            GhostObjectCollection.Instance.RemoveGhostObjectBehaviour(this);
        }

        private void MakeGhostGhosty()
        {
            if (m_GhostObject != null)
            {
                foreach (var renderer in m_GhostObject.Renderers)
                {
                    renderer.gameObject.layer = LayerMask.NameToLayer("Default");
                }
            }
        }

        private void MakeGhostReal()
        {
            if (m_GhostObject != null)
            {
                foreach (var renderer in m_GhostObject.Renderers)
                {
                    if (renderer != null)
                    {
                        renderer.gameObject.layer = LayerMask.NameToLayer("Ghost");
                    }
                    
                }
            }
        }
        
        
        /// <summary>
        /// Set the local Alpha of the
        /// Ghost Object Behaviour to the passed value
        /// </summary>
        /// <param name="alpha"></param>
        public void SetAlpha(float alpha)
        {
            if (alpha <= 1 && alpha >= 0 )
            {
                m_Alpha = alpha;
            }
        }

#if UNITY_EDITOR
        private void GrabAllRenderers()
        {
            var renderList = new List<Renderer>();
            foreach(var rend in GetComponentsInChildren<Renderer>())
            {
                if (rend as ParticleSystemRenderer)
                {
                    continue;
                }

                if (rend as TrailRenderer)
                {
                    continue;
                }

                if (rend as LineRenderer)
                {
                    continue;
                }

                renderList.Add(rend);
            }

            if (renderList.Count > 0)
            {
                m_GhostObject.SetRenderers(renderList.ToArray());
            }
        }
#endif
        
        class SRDebuggerGhostAreRealSetting
        {
            public UnityAction MakeGhostsReal;
            public UnityAction MakeGhostsGhosty;
            private bool m_IsGhosty = false;
            
            
            public bool GetGhostsGhosty()
            {
                return m_IsGhosty;
            }
            
            public void SetGhostsGhosty(bool shouldBeGhosty)
            {
                if (shouldBeGhosty != m_IsGhosty)
                {
                    if (shouldBeGhosty)
                    {
                        Debug.Log("make em Ghosty");
                        MakeGhostsGhosty?.Invoke();
                    }
                    else
                    {
                        Debug.Log("make em Real");
                        MakeGhostsReal?.Invoke();
                    }
                    m_IsGhosty = shouldBeGhosty;
                }
            }
        }
    }

    /// <summary>
    /// Ghost Object is somewhat deprecated. However it remains as the Renderers in the scene
    /// are all hooked up to the instance of GhostObject via GhostObjectBehaviour.
    /// N.B We use to only pass around GhostObject but features got more demanding
    /// </summary>
    [System.Serializable]
    public class GhostObject
    {
        /// <summary>
        /// Renderers to be drawn through Albert Ghost Memory Pass
        /// </summary>
        [SerializeField] 
        private Renderer[] m_Renderers;

        public Renderer[] Renderers => m_Renderers;

        public void SetRenderers(Renderer[] renderers)
        {
            m_Renderers = renderers;
        }
    }

}