#include "twn_draw.h"
#include "twn_draw_c.h"
#include "twn_engine_context_c.h"
#include "twn_textures_c.h"
#include "twn_types.h"

#include <stb_ds.h>


/* TODO: automatic handling of repeating textures */
/*       for that we could allocate a loner texture */
void draw_triangle(const char *path,
                   Vec3 v0,
                   Vec3 v1,
                   Vec3 v2,
                   Vec2 uv0,
                   Vec2 uv1,
                   Vec2 uv2)
{
    const TextureKey texture_key = textures_get_key(&ctx.texture_cache, path);

    struct MeshBatchItem *batch_p = hmgetp_null(ctx.uncolored_mesh_batches, texture_key);
    if (!batch_p) {
        struct MeshBatch item = {0};
        hmput(ctx.uncolored_mesh_batches, texture_key, item);
        batch_p = &ctx.uncolored_mesh_batches[hmlenu(ctx.uncolored_mesh_batches) - 1];
    }

    UncoloredSpaceTriangle const triangle = {
        .v0 = v0,
        .v1 = v1,
        .v2 = v2,
        .uv1 = uv1,
        .uv0 = uv0,
        .uv2 = uv2,
    };

    UncoloredSpaceTriangle *triangles = (UncoloredSpaceTriangle *)(void *)batch_p->value.primitives;

    arrpush(triangles, triangle);
    batch_p->value.primitives = (uint8_t *)triangles;
}


void draw_uncolored_space_traingle_batch(struct MeshBatch *batch,
                                         TextureKey texture_key)
{
    VertexBuffer const vertex_array = get_scratch_vertex_array();

    finally_draw_uncolored_space_traingle_batch(batch, texture_key, vertex_array);
}