using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Sirenix.OdinInspector;
using UnityEngine;

namespace Beyond
{
    public class CharacterVisibilityController : MonoBehaviour
    {
        public enum State
        {
            NORMAL,
            GHOST,
            INVISIBLE,
            UNINITIALIZED
        };

        [Serializable]
        public struct ShaderValues
        {
            public float alpha;
            public float invisibility;
            public float fresnelPower;

            [ColorUsageAttribute(true, true, 0f, 8f, 0.125f, 3f)]
            public Color fresnelColor;

            public ShaderValues(float alpha, float invisibility, float fresnelPower, Color c)
            {
                fresnelColor = c;
                this.alpha = alpha;
                this.invisibility = invisibility;
                this.fresnelPower = 4f;
            }

            public ShaderValues Lerp(ShaderValues val, float t)
            {
                ShaderValues res;
                res.alpha = Mathf.Lerp(alpha, val.alpha, t);
                res.invisibility = Mathf.Lerp(invisibility, val.invisibility, t);
                res.fresnelPower = Mathf.Lerp(fresnelPower, val.fresnelPower, t);
                res.fresnelColor = Color.Lerp(fresnelColor, val.fresnelColor, t);
                return res;
            }
        }

        public bDamageModifierController m_damageModifierContoller;
        private const string NormalDamageModifierName = "NormalDamage", GhostDamageModifierName = "GhostDamage";
        private const int ghostDamagePercentage = 0, normalDamagePercentage = -100;

        public ShaderValues m_NormalShaderValue = new ShaderValues(1f, 0f, 4f, Color.black);
        public ShaderValues m_GhostShaderValue = new ShaderValues(0.5f, 0f, 4f, new Color(0f, 1.5f, 2f));
        public ShaderValues m_InvisibleShaderValue = new ShaderValues(0.4f, 10f, 4f, new Color(0f, 0.15f, 0.2f));

        public ShaderValues m_currentValues;
        public ShaderValues m_previousValues;
        public ShaderValues m_targetValues;

        public State m_currentState = State.UNINITIALIZED;
        private State m_targetState = State.NORMAL;
        public State m_startingState = State.NORMAL;
        public float m_transitionTime = 5f;
        private float m_timer = 0f;
        /*
                public float m_targetAlpha = 0.5f;
                [ColorUsageAttribute(true,true,0f,8f,0.125f,3f)]
                public Color m_targetFresnelColor = new Color(0f, 1f, 2f);

                public float m_targetFresnelPower = 4f;
                public float m_targetInvisibility = 0f;
          */

        public List<GameObject> gameObjectsToExclideFromChange;
        private List<Renderer> renderersToExcludeFromChange = new List<Renderer>();

        [OnValueChanged("SetAlpha")]
        public float m_alpha = 0f;

        [ColorUsageAttribute(true, true, 0f, 8f, 0.125f, 3f)]
        [OnValueChanged("SetFresnelColor")]
        public Color m_fresnelColor = new Color(0.5f, 0.5f, 2f);

        [OnValueChanged("SetFresnelPower")]
        public float m_fresnelPower = 4f;

        [OnValueChanged("SetCutoffThreshold")]
        public float m_dissolveTh = 0f;

        [OnValueChanged("SetInvisibility")]
        public float m_invisibility = 0f;

        private bool m_inTransition = false;
        private List<Material> m_materials;
        private Shader m_transparent;
        private Shader m_opaque;
        private int m_thresholID = Shader.PropertyToID("_Threshold");
        private int m_baseColorID = Shader.PropertyToID("_BaseColor");
        private int m_FresnelColorID = Shader.PropertyToID("_FresnelColor");
        private int m_FresnelPowerID = Shader.PropertyToID("FresnelPower");
        private int m_InvisibilityID = Shader.PropertyToID("_Invisibility");

        private bool m_usesTransparent = false;

        private void InitMaterials()
        {
            if (m_materials != null && m_materials.Count > 0)
                return;

            var renderers = GetComponentsInChildren<Renderer>().ToList();
            if (gameObjectsToExclideFromChange.Count > 0)
            {
                gameObjectsToExclideFromChange.ForEach(gameObject => renderersToExcludeFromChange.AddRange(gameObject.GetComponentsInChildren<Renderer>().ToList()));
                renderers.RemoveAll(item => renderersToExcludeFromChange.Contains(item));
            }
            m_materials = new List<Material>();
            foreach (var r in renderers)
            {
                foreach (var m in r.materials)
                    m_materials.Add(m);
            }

            var rdr = GetComponent<Renderer>();
            if (rdr)
            {
                foreach (var m in rdr.materials)
                    m_materials.Add(m);
            }

            m_transparent = Shader.Find("Shader Graphs/BeyondLitTransparent");
            //m_transparent
            if (m_transparent == null)
            {
                Debug.LogError("Transparent shader not found!");
            }
            m_opaque = Shader.Find("Shader Graphs/BeyondLit");
            if (m_opaque == null)
            {
                Debug.LogError("Opaque shader not found!");
            }
        }

        private ShaderValues GetValuesForState(State s)
        {
            ShaderValues v = m_NormalShaderValue;
            switch (s)
            {
                case State.NORMAL:
                    v = m_NormalShaderValue;
                    break;

                case State.GHOST:
                    v = m_GhostShaderValue;
                    break;

                case State.INVISIBLE:
                    v = m_InvisibleShaderValue;
                    break;
            }

            return v;
        }

        private void SetValues(ShaderValues val)
        {
            foreach (var m in m_materials)
            {
                Color c = m.GetColor(m_baseColorID);
                c.a = val.alpha;
                m.SetColor(m_baseColorID, c);
                m.SetColor(m_FresnelColorID, val.fresnelColor);
                m.SetFloat(m_FresnelPowerID, val.fresnelPower);
                m.SetFloat(m_InvisibilityID, val.invisibility);
            }
        }

        private void SetAlpha()
        {
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                Color c = m.GetColor(m_baseColorID);
                c.a = m_alpha;
                m.SetColor(m_baseColorID, c);
            }
        }

        private void SetFresnelColor()
        {
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.SetColor(m_FresnelColorID, m_fresnelColor);
            }
        }

        private void SetFresnelPower()
        {
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.SetFloat(m_FresnelPowerID, m_fresnelPower);
            }
        }

        private void SetCutoffThreshold()
        {
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.SetFloat(m_thresholID, m_dissolveTh);
            }
        }

        private void SetInvisibility()
        {
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.SetFloat(m_InvisibilityID, m_invisibility);
            }
        }

        [Button]
        public void SetNormalState()
        {
            SetState(State.NORMAL);
        }

        [Button]
        public void SetGhostState()
        {
            SetState(State.GHOST);
        }

        [Button]
        public void SetInvisibleState()
        {
            SetState(State.INVISIBLE);
        }

        [Button]
        public void SetTransparentShader()
        {
            if (m_usesTransparent)
                return;
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.shader = m_transparent;
            }

            m_usesTransparent = true;
        }

        [Button]
        public void SetOpaqueShader()
        {
            if (!m_usesTransparent)
                return;
#if UNITY_EDITOR
            InitMaterials();
#endif
            foreach (var m in m_materials)
            {
                m.shader = m_opaque;
            }

            m_usesTransparent = false;
        }

        public void SetState(State state)
        {
            if (state == m_currentState)
            {
                return;
            }
            if (m_currentState == State.UNINITIALIZED)
            {
                m_previousValues = m_currentValues = GetValuesForState(state);
                SetValues(m_currentValues);
                m_currentState = m_targetState = state;
                ManageStatesBehaviour(state);
                return;
            }
            //m_targetValues
            m_targetState = state;
            m_previousValues = m_targetValues;
            m_timer = 0f;
            m_targetValues = GetValuesForState(state);
            ManageStatesBehaviour(state);
        }

        private void ManageStatesBehaviour(State state)
        {
            switch (state)
            {
                case State.NORMAL:
                    EnableAllDamage();
                    break;

                case State.GHOST:
                    DisableAllDamageExceptGhost();
                    SetTransparentShader();
                    break;

                case State.INVISIBLE:
                    SetTransparentShader();
                    break;
            }
        }

        private void EnableAllDamage()
        {
            if (!m_damageModifierContoller)
            {
                return;
            }
            m_damageModifierContoller.SetModifierPercentageDamage(NormalDamageModifierName, 0);
            m_damageModifierContoller.SetModifierPercentageDamage(GhostDamageModifierName, 0);
        }

        private void DisableAllDamageExceptGhost()
        {
            if (!m_damageModifierContoller)
            {
                return;
            }
            m_damageModifierContoller.SetModifierPercentageDamage(NormalDamageModifierName, normalDamagePercentage);
            m_damageModifierContoller.SetModifierPercentageDamage(GhostDamageModifierName, ghostDamagePercentage);
        }

        private void Update()
        {
            if (m_currentState != m_targetState)
            {
                if (m_timer > m_transitionTime)
                {
                    m_currentState = m_targetState;
                    m_currentValues = m_targetValues;
                    switch (m_targetState)
                    {
                        case State.NORMAL:
                            SetOpaqueShader();
                            break;

                        case State.GHOST:
                            break;

                        case State.INVISIBLE:
                            break;
                    }
                }
                else
                {
                    m_previousValues = GetValuesForState(m_currentState);
                    m_currentValues = m_previousValues.Lerp(m_targetValues, m_timer / m_transitionTime);
                    m_timer += Time.deltaTime;
                }
                SetValues(m_currentValues);
            }
        }

        private void Start()
        {
            m_currentState = State.UNINITIALIZED;
            InitMaterials();
            SetState(m_startingState);
        }
    }
}