/* opkg_message.c - the opkg package management system

   Copyright (C) 2009 Ubiq Technologies <graham.gower@gmail.com>
   Copyright (C) 2003 Daniele Nicolodi <daniele@grinta.net>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#include <stdio.h>

#include "opkg_conf.h"
#include "opkg_message.h"
#include "libbb/libbb.h"

struct errlist {
	char *errmsg;
	struct errlist *next;
};

static struct errlist *error_list_head, *error_list_tail;

static void push_error_list(char *msg)
{
	struct errlist *e;

	e = xcalloc(1, sizeof(struct errlist));
	e->errmsg = xstrdup(msg);
	e->next = NULL;

	if (error_list_head) {
		error_list_tail->next = e;
		error_list_tail = e;
	} else {
		error_list_head = error_list_tail = e;
	}
}

void free_error_list(void)
{
	struct errlist *err, *err_tmp;

	err = error_list_head;
	while (err != NULL) {
		free(err->errmsg);
		err_tmp = err;
		err = err->next;
		free(err_tmp);
	}
}

void print_error_list(void)
{
	struct errlist *err = error_list_head;

	if (err) {
		fprintf(stderr, "Collected errors:\n");
		/* Here we print the errors collected and free the list */
		while (err != NULL) {
			fprintf(stderr, " * %s", err->errmsg);
			err = err->next;
		}
	}
}

void opkg_message(message_level_t level, const char *fmt, ...)
{
	va_list ap;

	if (conf->verbosity < level)
		return;

	if (conf->opkg_vmessage) {
		/* Pass the message to libopkg users. */
		va_start(ap, fmt);
		conf->opkg_vmessage(level, fmt, ap);
		va_end(ap);
		return;
	}

	va_start(ap, fmt);

	if (level == ERROR) {
#define MSG_LEN 4096
		char msg[MSG_LEN];
		int ret;
		ret = vsnprintf(msg, MSG_LEN, fmt, ap);
		if (ret < 0) {
			fprintf(stderr, "%s: encountered an output or encoding"
				" error during vsnprintf.\n", __FUNCTION__);
			va_end(ap);
			exit(EXIT_FAILURE);
		}
		if (ret >= MSG_LEN) {
			fprintf(stderr, "%s: Message truncated.\n",
				__FUNCTION__);
		}
		push_error_list(msg);
	} else {
		if (vprintf(fmt, ap) < 0) {
			fprintf(stderr, "%s: encountered an output or encoding"
				" error during vprintf.\n", __FUNCTION__);
			exit(EXIT_FAILURE);
		}
	}

	va_end(ap);
}