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

public class VenusDeath : MonoBehaviour
{
    public float troposphereLevel = 1f;
    public float mesosphereLevel = 1f;
    public Texture2D deadTexture;
    public Transform sunTransform;

    private Renderer planetRenderer;
    private Material mat;
    private float prevTropo = -1f;
    private float prevMeso = -1f;
    private bool deadApplied = false;

    private Texture2D originalTexture;

    public float thermosphereLevel = 1f;
    private float prevThermo = -1f;

    void Start()
    {
        planetRenderer = GetComponent<Renderer>();
        if (planetRenderer == null)
            planetRenderer = GetComponentInChildren<Renderer>();
        if (planetRenderer != null)
        {
            mat = planetRenderer.material;
            originalTexture = (Texture2D)mat.GetTexture("_Texture2D");
        }
    }

    void Update()
    {
        if (mat == null) return;

        if (sunTransform != null)
        {
            Vector3 sunDir = (sunTransform.position - transform.position).normalized;
            mat.SetVector("_SunDirection", new Vector4(sunDir.x, sunDir.y, sunDir.z, 0f));
        }

        if (!Mathf.Approximately(thermosphereLevel, prevThermo))
        {
            prevThermo = thermosphereLevel;
            mat.SetFloat("_ThermosphereLevel", thermosphereLevel);
        }

        if (thermosphereLevel >= 14f && !deadApplied)
        {
            deadApplied = true;
            if (deadTexture != null)
                mat.SetTexture("_Texture2D", deadTexture);
            mat.SetFloat("_TroposphereLevel", 0f);
            return;
        }

        if (mesosphereLevel <= 0f && !deadApplied)
        {
            deadApplied = true;
            if (deadTexture != null)
                mat.SetTexture("_Texture2D", deadTexture);
            mat.SetFloat("_TroposphereLevel", 0f);
            return;
        }

        if (Mathf.Approximately(troposphereLevel, prevTropo) &&
            Mathf.Approximately(mesosphereLevel, prevMeso)) return;

        prevTropo = troposphereLevel;
        prevMeso = mesosphereLevel;

        float heatLevel = 1f;
        if (troposphereLevel >= 1f)
            heatLevel = 1f;
        else if (troposphereLevel >= 0.7f)
            heatLevel = Mathf.Lerp(1f, 0.7f, Mathf.InverseLerp(1f, 0.7f, troposphereLevel));
        else if (troposphereLevel >= 0.5f)
            heatLevel = Mathf.Lerp(0.7f, 0.4f, Mathf.InverseLerp(0.7f, 0.5f, troposphereLevel));
        else if (troposphereLevel >= 0.3f)
            heatLevel = Mathf.Lerp(0.4f, 0.1f, Mathf.InverseLerp(0.5f, 0.3f, troposphereLevel));
        else
            heatLevel = Mathf.Lerp(0.1f, 0f, Mathf.InverseLerp(0.3f, 0f, troposphereLevel));

        mat.SetFloat("_TroposphereLevel", heatLevel);
    }

    public void ApplyDeadColors()
    {
        if (mat == null) return;
        deadApplied = true;
        if (deadTexture != null)
            mat.SetTexture("_Texture2D", deadTexture);
        mat.SetFloat("_TroposphereLevel", 0f);
    }

    public void ResetTexture()
    {
        troposphereLevel = 1f;
        mesosphereLevel = 1f;
        prevTropo = -1f;
        prevMeso = -1f;
        deadApplied = false;
        if (mat != null)
        {
            if (originalTexture != null)
                mat.SetTexture("_Texture2D", originalTexture);
            mat.SetFloat("_TroposphereLevel", 1f);
            mat.SetColor("DayColor", new Color(1f, 0.4f, 0.05f));
            mat.SetColor("NightColor", new Color(0.02f, 0.02f, 0.08f));
        }

        thermosphereLevel = 1f;
        prevThermo = -1f;
        mat.SetFloat("_ThermosphereLevel", 0f);
    }
}