#include <stdarg.h>
#include <stdio.h>

#include "node.h"
#include "printxf.h"
#include "sym.h"
#include "type.h"

struct ast_fprint_info {
	FILE *fp;
	int indent;
};

static int __ast_fprint_pre(struct node *n, void *_info)
{
	struct ast_fprint_info *info = _info;
	struct node *arg;

	if (n->prev)
		fputc(' ', info->fp);

	if (node_is(n->up, ":block")) {
		info->indent += 4;
		fprintf(info->fp, "\n%*s", info->indent, "");
	}

	if (n->ntype == N_EXPR)
		fputc('(', info->fp);

	fprintxf(NULL, info->fp,
		 "%N%T", n, n->sym ? n->sym->type : NULL);

	if ((n->ntype == N_EXPR) && n->expr.args)
		fputc(' ', info->fp);

	return 0;
}

static int __ast_fprint_post(struct node *n, void *_info)
{
	struct ast_fprint_info *info = _info;
	struct node *c;

	if (node_is(n, ":block"))
		fprintf(info->fp, "\n%*s", info->indent, "");

	if (n->ntype == N_EXPR)
		fputc(')', info->fp);

	if (node_is(n->up, ":block"))
		info->indent -= 4;
	
	return 0;
}

void ast_fprint(FILE *fp, struct node *root)
{
	struct ast_fprint_info info = {
		.fp = fp,
	};

	node_walk(root, __ast_fprint_pre, __ast_fprint_post, &info);
	fputc('\n', fp);		
}


int order_vfprintxf(struct printxf *pxf, FILE *fp, const char *fmt, va_list ap)
{
	int arg = va_arg(ap, int);

	switch (arg) {
	case 1:
		fputs("1st", fp);
		return 3;
	case 2:
		fputs("2nd", fp);
		return 3;
	case 3:
		fputs("3rd", fp);
		return 3;
	}

	return fprintf(fp, "%dth", arg);
}

__attribute__((constructor))
static void utils_init(void)
{
	printxf_default.vfprintxf['O'] = order_vfprintxf;
}