#ifndef ECEX_FONT_H
#define ECEX_FONT_H

#include <GLFW/glfw3.h>
#include "stb_truetype.h"

#define ECEX_FONT_BITMAP_W 512
#define ECEX_FONT_BITMAP_H 512
#define ECEX_FONT_FIRST_CHAR 32
#define ECEX_FONT_CHAR_COUNT 96

typedef struct font {
    GLuint texture;
    stbtt_bakedchar chars[ECEX_FONT_CHAR_COUNT];

    float size_px;

    /*
     * draw_text() takes y as a baseline. These metrics let render.c place
     * baselines, highlights, bars, and cursors from the same font-scaled
     * coordinate system instead of fixed pixel constants.
     */
    float ascent_px;
    float descent_px;
    float line_gap_px;
    float line_height;
} font_t;

const char *font_choose_path(const char *explicit_font_path);
int font_load(font_t *font, const char *path, float size_px);
void font_free(font_t *font);

void draw_text(font_t *font, float x, float y, const char *text);
float text_width(font_t *font, const char *text);

#endif