#pragma once
#include "suic_math.h"
#include <stdint.h>

/**
 * Lighting system API.
 * Supports directional lighting, shadows, ambient occlusion, and Phong shading.
 */

typedef struct SuicColor {
    uint8_t r, g, b, a;
} SuicColor;

typedef struct SuicDirectionalLight {
    SuicVec3 direction;
    SuicVec3 color;
    float intensity;
    float ambientIntensity;
    float shadowBias;
    float shadowIntensity;
} SuicDirectionalLight;

/* Light creation */
SuicDirectionalLight suic_light_create(float dir_x, float dir_y, float dir_z,
                                        float intensity, float ambient);
SuicDirectionalLight suic_light_create_default(void);

/* Basic lighting */
SuicColor suic_light_apply(SuicColor base, SuicVec3 normal, SuicDirectionalLight* light);

/* Lighting with shadows */
SuicColor suic_light_apply_shadows(SuicColor base, SuicVec3 normal, SuicVec3 worldPos,
                                   SuicDirectionalLight* light);

/* Phong lighting (with specular) */
SuicColor suic_light_apply_phong(SuicColor base, SuicVec3 normal, SuicVec3 worldPos,
                                 SuicVec3 camPos, SuicDirectionalLight* light);

/* Shadow calculations */
float suic_shadow_factor(SuicVec3 worldPos, SuicVec3 lightDir, float maxDist);
float suic_shadow_temporal(SuicVec3 worldPos, float timePhase);

/* Ambient occlusion */
float suic_ao_calculate(SuicVec3 worldPos, SuicVec3 normal);