fn_wasm_import void wasm_clear(void);
fn_wasm_import void wasm_draw_text(isize str, i32 len, f32 x, f32 y, isize font_str, i32 font_len, i32 font_size, f32 r, f32 g, f32 b, f32 a);
fn_wasm_import void wasm_draw_rect(f32 x, f32 y, f32 w, f32 h, f32 r, f32 g, f32 b, f32 a);
fn_wasm_import f32  wasm_measure_text(isize str, i32 len, isize font_str, i32 font_len, i32 font_size);
fn_wasm_import void wasm_set_clip(f32 x, f32 y, f32 w, f32 h);

gb_read_only s8_t font_face = s8_const_lit("main_font");

typedef struct rn_font_t rn_font_t;
struct rn_font_t {
    f32 size;
};

typedef struct rn_state_t rn_state_t;
struct rn_state_t {
    rn_font_t *main_font;
    app_frame_t *frame;
};
rn_state_t rn_state;

fn void rn_reload_font(f32 font_size, f32 dpr) {
    rn_state.main_font->size = font_size * dpr;
}

fn void rn_init(ma_arena_t *perm, f32 font_size, f32 dpr) {
    rn_state.main_font = ma_push_type(perm, rn_font_t);
    rn_reload_font(font_size, dpr);
}

fn void rn_draw_rect(r2f32_t rect, v4f32_t color) {
    wasm_draw_rect(rect.min.x, rect.min.y, (rect.max.x - rect.min.x), (rect.max.y - rect.min.y), color.r * 255.f, color.g * 255.f, color.b * 255.f, color.a);
}

fn void rn_draw_rect_border(r2f32_t rect, v4f32_t color, f32 border_thickness) {
    r2f32_t left = r2f32_cut_left(&rect, border_thickness);
    r2f32_t right = r2f32_cut_right(&rect, border_thickness);
    r2f32_t top = r2f32_cut_top(&rect, border_thickness);
    r2f32_t bottom = r2f32_cut_bottom(&rect, border_thickness);
    rn_draw_rect(left, color);
    rn_draw_rect(right, color);
    rn_draw_rect(top, color);
    rn_draw_rect(bottom, color);
}

fn v2f32_t rn_measure_string(rn_font_t *font, s8_t string) {
    f32 x = wasm_measure_text((isize)string.str, string.len, (isize) font_face.str, font_face.len, rn_state.main_font->size);
    return (v2f32_t){x, rn_state.main_font->size};
}

fn v2f32_t rn_draw_string(rn_font_t *font, v2f32_t pos, v4f32_t color, s8_t string) {
    wasm_draw_text((isize)string.str, string.len, pos.x, pos.y, (isize) font_face.str, font_face.len, rn_state.main_font->size, color.r * 255.f, color.g * 255.f, color.b * 255.f, color.a);
    v2f32_t size = rn_measure_string(font, string);
    return size;
}

fn v2f32_t rn_draw_stringf(rn_font_t *font, v2f32_t pos, v4f32_t color, char *str, ...) {
    S8_FMT(tcx.temp, str, string);
    return rn_draw_string(font, pos, color, string);
}

fn void rn_set_clip(r2f32_t rect) {
    wasm_set_clip(rect.min.x, rect.min.y, (rect.max.x - rect.min.x), (rect.max.y - rect.min.y));
}

fn void rn_begin(app_frame_t *frame, v4f32_t clear_color) {
    rn_state.frame      = frame;
    r2f32_t window_rect = r2f32(0, 0, rn_state.frame->window_size.x, rn_state.frame->window_size.y);
    wasm_clear();
    rn_draw_rect(window_rect, clear_color);
}

fn void rn_end() {
}