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

[CreateAssetMenu(fileName = "VisualStyle", menuName = "UniQuake/Visual Style", order = 1)]
public class VisualStyle : ScriptableObject
{
    [SerializeField]
    protected Material entityMaterial;

    [SerializeField]
    protected Material worldMaterial;    // TODO: split into wall, liquid, sky, etc

    [SerializeField]
    protected Material liquidMaterial;

    [SerializeField] 
    protected LiquidProperties liquidProperties = new LiquidProperties();

    [SerializeField]
    protected ParticleSystems particles = new ParticleSystems();
    public ParticleSystems Particles => particles;

    public virtual Material CreateEntityMaterial()
    {
        return new Material(entityMaterial);
    }

    public virtual Material CreateWorldMaterial(QSurfaceFlags surfaceFlags)
    {
        if (surfaceFlags.HasFlag(QSurfaceFlags.DrawTurbulence) && liquidMaterial != null)
        {
            float alpha = 1f;
            if (surfaceFlags.HasFlag(QSurfaceFlags.DrawWater))
                alpha = liquidProperties.waterAlpha;
            else if (surfaceFlags.HasFlag(QSurfaceFlags.DrawSlime))
                alpha = liquidProperties.slimeAlpha;
            else if (surfaceFlags.HasFlag(QSurfaceFlags.DrawLava))
                alpha = liquidProperties.lavaAlpha;
            else if (surfaceFlags.HasFlag(QSurfaceFlags.DrawTeleporter))
                alpha = liquidProperties.teleporterAlpha;

            var material = new Material(liquidMaterial);
            material.SetColor("_BaseColor", new Color(1, 1, 1, alpha));
            return material;
        }
        
        return new Material(worldMaterial);
    }
    
    public virtual void SetupEntityRenderer(MeshRenderer meshRenderer)
    {
        meshRenderer.shadowCastingMode = ShadowCastingMode.Off;
        meshRenderer.receiveShadows = false;
        meshRenderer.lightProbeUsage = LightProbeUsage.Off;
        meshRenderer.reflectionProbeUsage = ReflectionProbeUsage.Off;
    }

    public virtual void SetupEntityRenderer(SkinnedMeshRenderer skinnedMeshRenderer)
    {
        skinnedMeshRenderer.shadowCastingMode = ShadowCastingMode.Off;
        skinnedMeshRenderer.receiveShadows = false;
        skinnedMeshRenderer.lightProbeUsage = LightProbeUsage.Off;
        skinnedMeshRenderer.reflectionProbeUsage = ReflectionProbeUsage.Off;
    }

    public virtual void SetupWorldRenderer(MeshRenderer meshRenderer)
    {
        meshRenderer.shadowCastingMode = ShadowCastingMode.Off;
        meshRenderer.receiveShadows = false;
        meshRenderer.lightProbeUsage = LightProbeUsage.Off;
        meshRenderer.reflectionProbeUsage = ReflectionProbeUsage.Off;
    }

    public virtual void SetEntityTextures(Material material, Texture2D mainTexture, Texture2D fullBright)
    {
        material.mainTexture = mainTexture;

        material.SetTexture("_EmissionMap", fullBright);
        material.SetColor("_EmissionColor", Color.white);
        
        if (fullBright != null)
            material.EnableKeyword("_EMISSION");
        else
            material.DisableKeyword("_EMISSION");
    }

    public virtual void SetWorldTextures(Material material, Texture2D mainTexture, Texture2D fullBright, Texture2D lightmap)
    {
        material.mainTexture = mainTexture;

        material.SetTexture("_EmissionMap", fullBright);
        material.SetColor("_EmissionColor", Color.white);
        
        if (fullBright != null)
            material.EnableKeyword("_EMISSION");
        else
            material.DisableKeyword("_EMISSION");
        
        // TODO: lightmap texture
    }
}

[System.Serializable]
public class LiquidProperties
{
    [Range(0, 1)]
    public float
        waterAlpha = 0.85f,
        slimeAlpha = 0.9f,
        lavaAlpha = 0.95f,
        teleporterAlpha = 1.0f;
}

[System.Serializable]
public class ParticleSystems
{
    [SerializeField]
    protected ParticleSystem explosion;

    public virtual void CreateExplosion(Vector3 position)
    {
        var go = Object.Instantiate(explosion.gameObject);
        go.transform.position = position;
    }
}