#include "Triangle.h"

triangle_collection_t triangle_collection_create(size_t size)
{
    if (size > UINT64_MAX)
    {
        size = UINT64_MAX;
    }

    triangle_collection_t collection = {0};
    collection.buffer = (triangle_t*)malloc(size * sizeof(triangle_t));
    collection.size = (uint64_t)size;
    return collection;
}

void triangle_collection_resize(triangle_collection_t* collection, size_t size)
{
    if (size > UINT64_MAX)
    {
        size = UINT64_MAX;
    }

    triangle_t* temp = realloc(collection->buffer, size * sizeof(triangle_t));
    if (temp != NULL)
    {
        collection->buffer = temp;
        collection->size = (uint64_t)size;
    }
}

void triangle_collection_free(triangle_collection_t* collection)
{
    if (collection->buffer != NULL)
    {
        free(collection->buffer);
        collection->buffer = NULL;
    }
}

void triangle_create(vec3s point1, vec3s point2, vec3s point3, uint8_t material_id, triangle_collection_t* collection)
{
    if (collection->count >= collection->size)
    {
        triangle_collection_resize(collection, collection->size * 2);
    }

    triangle_t new_triangle;
    new_triangle.point1 = point1;
    new_triangle.point2 = point2;
    new_triangle.point3 = point3;
    new_triangle.material_id = material_id;

    vec3s edge1 = glms_vec3_sub(point2, point1);
    vec3s edge2 = glms_vec3_sub(point3, point1);
    new_triangle.normal = glms_vec3_normalize(glms_vec3_cross(edge1, edge2));

    collection->buffer[collection->count] = new_triangle;
    collection->count++;
}