#ifndef MGL_TEXT_H
#define MGL_TEXT_H

/*
    TODO: Do not render text outside the window and start from the visible part.
    Support 64-bit text length on 32-bit systems, and use mmap to optimize loading very large files,
    and munmap the text parts that are not visible on the screen.
*/

#include "../system/vec.h"
#include "color.h"
#include <stddef.h>
#include <stdbool.h>

typedef struct mgl_font mgl_font;
typedef struct mgl_context mgl_context;

typedef struct {
    mgl_font *font; /* nullable */
    const char *text; /* nullable */
    size_t text_size;
    mgl_color color;
    mgl_vec2f position;
    mgl_vec2f bounds;
    bool bounds_dirty;
} mgl_text;

/*
    Note: keeps a reference to |text|. |text| needs to be valid as long as |self| is used.
    |font| and |text| may be NULL.
*/
void mgl_text_init(mgl_text *self, mgl_font *font, const char *str, size_t str_size);
void mgl_text_deinit(mgl_text *self);

/*
    Note: keeps a reference to |text|. |text| needs to be valid as long as |self| is used.
    |text| may be NULL.
*/
void mgl_text_set_string(mgl_text *self, const char *str, size_t str_size);
/* |font| may be NULL */
void mgl_text_set_font(mgl_text *self, mgl_font *font);
void mgl_text_set_position(mgl_text *self, mgl_vec2f position);
void mgl_text_set_color(mgl_text *self, mgl_color color);
mgl_vec2f mgl_text_get_bounds(mgl_text *self);
/* Returns the position of the character on the screen (relative to the current mgl_view) */
mgl_vec2f mgl_text_find_character_pos(mgl_text *self, size_t index);
void mgl_text_draw(mgl_context *context, mgl_text *text);

#endif /* MGL_TEXT_H */