/*
 * %W% %E%
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
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* Copyright (c) 2003 Sun Microsystems, Inc.  All Rights Reserved.
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* modification, are permitted provided that the following conditions are met:
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/joystick.h>
#include "util.h"
#include "net_java_games_input_LinuxJoystickDevice.h"

JNIEXPORT jlong JNICALL Java_net_java_games_input_LinuxJoystickDevice_nOpen(JNIEnv *env, jclass unused, jstring path) {
	const char *path_str = (*env)->GetStringUTFChars(env, path, NULL);
	if (path_str == NULL)
		return -1;
	int fd = open(path_str, O_RDONLY | O_NONBLOCK);
	if (fd == -1)
		throwIOException(env, "Failed to open device %s (%d)\n", path_str, errno);
	(*env)->ReleaseStringUTFChars(env, path, path_str);
	return fd;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxJoystickDevice_nClose(JNIEnv *env, jclass unused, jlong fd_address) {
	int fd = (int)fd_address;
	int result = close(fd);
	if (result == -1)
		throwIOException(env, "Failed to close device (%d)\n", errno);
}

JNIEXPORT jstring JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetName(JNIEnv *env, jclass unused, jlong fd_address) {
#define BUFFER_SIZE 1024
	int fd = (int)fd_address;
	char device_name[BUFFER_SIZE];
	
	if (ioctl(fd, JSIOCGNAME(BUFFER_SIZE), device_name) == -1) {
		throwIOException(env, "Failed to get device name (%d)\n", errno);
		return NULL;
	}
	jstring jstr = (*env)->NewStringUTF(env, device_name);
	return jstr;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetVersion(JNIEnv *env, jclass unused, jlong fd_address) {
	int fd = (int)fd_address;
	__u32 version;
	if (ioctl(fd, JSIOCGVERSION, &version) == -1) {
		throwIOException(env, "Failed to get device version (%d)\n", errno);
		return -1;
	}
	return version;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNumButtons(JNIEnv *env, jclass unused, jlong fd_address) {
	int fd = (int)fd_address;
	__u8 num_buttons;
	if (ioctl(fd, JSIOCGBUTTONS, &num_buttons) == -1) {
		throwIOException(env, "Failed to get number of buttons (%d)\n", errno);
		return -1;
	}
	return num_buttons;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNumAxes(JNIEnv *env, jclass unused, jlong fd_address) {
	int fd = (int)fd_address;
	__u8 num_axes;
	if (ioctl(fd, JSIOCGAXES, &num_axes) == -1) {
		throwIOException(env, "Failed to get number of buttons (%d)\n", errno);
		return -1;
	}
	return num_axes;
}

JNIEXPORT jboolean JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNextEvent(JNIEnv *env, jclass unused, jlong fd_address, jobject event_return) {
	int fd = (int)fd_address;
	jclass event_class = (*env)->GetObjectClass(env, event_return);
	if (event_class == NULL)
		return JNI_FALSE;
	jmethodID event_set = (*env)->GetMethodID(env, event_class, "set", "(JIII)V");
	if (event_set == NULL)
		return JNI_FALSE;
	struct js_event event;
	if (read(fd, &event, sizeof(event)) == -1) {
		if (errno == EAGAIN)
			return JNI_FALSE;
		throwIOException(env, "Failed to read next device event (%d)\n", errno);
		return JNI_FALSE;
	}
	(*env)->CallVoidMethod(env, event_return, event_set, (jlong)event.time, (jint)event.value, (jint)event.type, (jint)event.number);
	return JNI_TRUE;
}