#include "renderer.h"
#include <stdlib.h>

Renderer* renderer_create(GraphicsDevice* device) {
    Renderer* r = (Renderer*)calloc(1, sizeof(Renderer));
    r->device = device;
    mat4_identity(&r->view);
    mat4_identity(&r->projection);
    r->light_dir = (Vec3){0.5f, -1.0f, 0.3f};
    r->light_color = (Vec4){1,1,1,1};
    r->ambient_color = (Vec4){0.2f,0.2f,0.3f,1};
    return r;
}

void renderer_destroy(Renderer* r) { free(r); }

void renderer_begin_frame(Renderer* r) {
    graphics_device_clear(r->device, 0.1f, 0.1f, 0.15f, 1.0f);
}

void renderer_end_frame(Renderer* r) {
    graphics_device_present(r->device);
}

void renderer_draw_mesh(Renderer* r, Mesh* m) {
    if (!m) return;
    ID3D11DeviceContext* ctx = r->device->context;
    UINT stride = sizeof(Vertex);
    UINT offset = 0;
    ctx->lpVtbl->IASetVertexBuffers(ctx, 0, 1, &m->vb, &stride, &offset);
    if (m->ib) {
        ctx->lpVtbl->IASetIndexBuffer(ctx, m->ib, DXGI_FORMAT_R32_UINT, 0);
        ctx->lpVtbl->DrawIndexed(ctx, m->icount, 0, 0);
    } else {
        ctx->lpVtbl->Draw(ctx, m->vcount, 0);
    }
}

void renderer_draw_mesh_with_shader(Renderer* r, Mesh* m, Shader* s, const Mat4* world, Texture* t) {
    if (!m || !s) return;
    ID3D11DeviceContext* ctx = r->device->context;
    shader_bind(s, ctx);
    renderer_draw_mesh(r, m);
}

void renderer_set_view(Renderer* r, const Mat4* v) { r->view = *v; }
void renderer_set_projection(Renderer* r, const Mat4* p) { r->projection = *p; }
void renderer_set_light(Renderer* r, Vec3 d, Vec4 c, Vec4 a) { r->light_dir=d; r->light_color=c; r->ambient_color=a; }
GraphicsDevice* renderer_get_device(Renderer* r) { return r ? r->device : NULL; }

void renderer_resize(Renderer* r, int width, int height) {
    if (r && r->device && width > 0 && height > 0) {
        graphics_device_resize(r->device, width, height);
    }
}