/* See LICENSE file for copyright and license details. */
#include "libgamma_LibgammaException.h"
#include <stdlib.h>
#include <string.h>

#include <libgamma.h>


/**
 * Returns the name of the definition associated with
 * a <tt>libgamma</tt> error code
 * 
 * @param   value  The error code
 * @return         The name of the definition associated with the error code,
 *                 {@code null} if the error code does not exist
 */
jstring
Java_libgamma_LibgammaException_name_1of_1error(JNIEnv *env, jclass class, jint value)
{
	/* It is really unlikely that `malloc` returns `NULL` here
	 * and error handing makes this unnecessarily comples,
	 * therefore we will simply skip it */
  
	const char *do_not_free_this = libgamma_name_of_error(value);
	char *this_will_be_freed;
	size_t n;
	if (!do_not_free_this)
		return NULL;

	n = strlen(do_not_free_this) + 1;
	this_will_be_freed = malloc(n * sizeof(char));
	memcpy(this_will_be_freed, do_not_free_this, n * sizeof(char));

	return (*env)->NewStringUTF(env, this_will_be_freed);
	(void) class;
}

/**
 * Return the value of a <tt>libgamma</tt> error definition
 * refered to by name
 * 
 * @param   name  The name of the definition associated with the error code
 * @return        The error code, zero if the name is {@code null}
 *                or does not refer to a <tt>libgamma</tt> error
 */
jint
Java_libgamma_LibgammaException_value_1of_1error(JNIEnv *env, jclass class, jstring name)
{
	const char *name_chars;
	int rc;
	if (!name)
		return 0;
	name_chars = (*env)->GetStringUTFChars(env, name, NULL);
	rc = libgamma_value_of_error(name_chars);
	(*env)->ReleaseStringUTFChars(env, name, name_chars);
	return rc;
	(void) class;
}

/**
 * Acquire the value that should go to {@link #group_gid}
 * 
 * @return  The value that should go to {@link #group_gid}
 */
jint
Java_libgamma_LibgammaException_libgamma_1group_1gid(JNIEnv *env, jclass class)
{
	return (jint)libgamma_group_gid;
	(void) env;
	(void) class;
}

/**
 * Acquire the value that should go to {@link #group_name}
 * 
 * @return  The value that should go to {@link #group_name}
 */
jstring
Java_libgamma_LibgammaException_libgamma_1group_1name(JNIEnv *env, jclass class)
{
	/* It is really unlikely that `malloc` returns `NULL` here
	 * and error handing makes this unnecessarily comples,
	 * therefore we will simply skip it */

	const char *do_not_free_this = libgamma_group_name;
	char *this_will_be_freed;
	size_t n;
	if (!do_not_free_this)
		return NULL;

	n = strlen(do_not_free_this) + 1;
	this_will_be_freed = malloc(n * sizeof(char));
	memcpy(this_will_be_freed, do_not_free_this, n * sizeof(char));

	return (*env)->NewStringUTF(env, this_will_be_freed);
	(void) class;
}

/**
 * Get a textual description of a system error code
 * 
 * @param   error_code  The error code
 * @return              A textual description of the error code
 */
jstring
Java_libgamma_LibgammaException_strerror(JNIEnv *env, jclass class, jint error_code)
{
	/* It is really unlikely that `malloc` returns `NULL` here
	 * and error handing makes this unnecessarily comples,
	 * therefore we will simply skip it */

	const char *do_not_free_this = strerror(error_code);
	char *this_will_be_freed;
	size_t n;
	if (!do_not_free_this)
		return NULL;

	n = strlen(do_not_free_this) + 1;
	this_will_be_freed = malloc(n * sizeof(char));
	memcpy(this_will_be_freed, do_not_free_this, n * sizeof(char));

	return (*env)->NewStringUTF(env, this_will_be_freed);
	(void) class;
}