#include <TeX/TeX.h>
#include <TeX/node.h>
#include <TeX/flow.h>
#include <TeX/env.h>

#include <TeX/defs.h>
#include <TeX/interface.h>

#include <stdlib.h>
#include <string.h>

//---
//	Interface functions
//---

/* Rendering-related interface functions */
void (*TeX_pixel)(int x, int y, int color) = NULL;
void (*TeX_line)(int x1, int y1, int x2, int y2, int color) = NULL;
void (*TeX_size)(char const *str, int *width, int *height) = NULL;
void (*TeX_text)(char const *str, int x, int y, int color) = NULL;

/* TeX_intf_pixel(): Set a single pixel */
void TeX_intf_pixel(void (*draw_pixel)(int x, int y, int color))
{
	TeX_pixel = draw_pixel;
}

/* TeX_intf_line(): Draw a line */
void TeX_intf_line(void (*draw_line)(int x1, int y1, int x2, int y2,
	int color))
{
	TeX_line = draw_line;
}

/* TeX_intf_size(): Get the dimensions of a string */
void TeX_intf_size(void (*text_size)(char const *str, int *width,int *height))
{
	TeX_size = text_size;
}

/* TeX_intf_text(): Draw variable-width text */
void TeX_intf_text(void (*draw_text)(char const *str, int x, int y,int color))
{
	TeX_text = draw_text;
}

//---
//	Object management
//---

/* TeX_free(): Free an allocated TeX formula */
void TeX_free(struct TeX_Env *env)
{
	if(env) env->free(env);
}

//---
//	Module functions
//---

/* TeX_parse(): Parse a TeX formula */
struct TeX_Env *TeX_parse(char const *formula)
{
	/* Provided by the parser. */
	struct TeX_Env *parse(char const *str);

	struct TeX_Env *env = parse(formula);
	if(!env) return NULL;

	env->layout(env);
	return env;
}

/* TeX_draw(): Render a parsed formula */
void TeX_draw(struct TeX_Env *formula, int x, int y, int color)
{
	formula->render(formula, x, y, color);
}

/* TeX_interpret(): Parse and render, in sequence */
void TeX_interpret(char const *formula, int x, int y, int color)
{
	struct TeX_Env *env = TeX_parse(formula);
	if(!env) return;

	TeX_draw(env, x, y, color);
	TeX_free(env);
}