/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "jdk_internal_jline_WindowsTerminal.h"

#include <stdlib.h>

#include <Wincon.h>

#include <Winuser.h>

static jclass recordClass;

static jmethodID recordConstructor;

JNIEXPORT void JNICALL Java_jdk_internal_jline_WindowsTerminal_initIDs

  (JNIEnv *env, jclass) {

    jclass cls = env->FindClass("jdk/internal/jline/WindowsTerminal$KEY_EVENT_RECORD");

    CHECK_NULL(cls);

    recordClass = (jclass) env->NewGlobalRef(cls);

    CHECK_NULL(recordClass);

    recordConstructor = env->GetMethodID(cls, "<init>", "(ZCIII)V");

    CHECK_NULL(recordConstructor);

}

JNIEXPORT jint JNICALL Java_jdk_internal_jline_WindowsTerminal_getConsoleMode

  (JNIEnv *, jobject) {

    HANDLE hStdIn;

    if ((hStdIn = GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {

        return -1;

    }

    DWORD fdwMode;

    if (! GetConsoleMode(hStdIn, &fdwMode)) {

        return -1;

    }

    return fdwMode;

}

JNIEXPORT void JNICALL Java_jdk_internal_jline_WindowsTerminal_setConsoleMode

  (JNIEnv *, jobject, jint mode) {

    HANDLE hStdIn;

    if ((hStdIn = GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {

        return ;

    }

    DWORD fdwMode = mode;

    SetConsoleMode(hStdIn, fdwMode);

}

JNIEXPORT jobject JNICALL Java_jdk_internal_jline_WindowsTerminal_readKeyEvent

  (JNIEnv *env, jobject) {

    HANDLE hStdIn;

    if ((hStdIn = GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {

        return NULL;

    }

    INPUT_RECORD record;

    DWORD n;

    while (TRUE) {

        if (ReadConsoleInputW(hStdIn, &record, 1, &n) == 0) {

            return NULL;

        }

        if (record.EventType == KEY_EVENT) {

            jclass clazz = env->FindClass("jdk/internal/jline/WindowsTerminal$KEY_EVENT_RECORD");

            jmethodID constr = env->GetMethodID(clazz, "<init>", "(ZCIII)V");

            return env->NewObject(recordClass,

                                  recordConstructor,

                                  record.Event.KeyEvent.bKeyDown,

                                  record.Event.KeyEvent.uChar.UnicodeChar,

                                  record.Event.KeyEvent.dwControlKeyState,

                                  record.Event.KeyEvent.wVirtualKeyCode,

                                  record.Event.KeyEvent.wRepeatCount);

        }

        continue;

    }

}

JNIEXPORT jint JNICALL Java_jdk_internal_jline_WindowsTerminal_getConsoleOutputCodepage

  (JNIEnv *, jobject) {

    return GetConsoleOutputCP();

}

JNIEXPORT jint JNICALL Java_jdk_internal_jline_WindowsTerminal_getWindowsTerminalWidth

  (JNIEnv *, jobject) {

    HANDLE hStdOut;

    if ((hStdOut = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE) {

        return -1;

    }

    CONSOLE_SCREEN_BUFFER_INFO info;

    if (! GetConsoleScreenBufferInfo(hStdOut, &info)) {

        return -1;

    }

    return info.srWindow.Right - info.srWindow.Left;

}

JNIEXPORT jint JNICALL Java_jdk_internal_jline_WindowsTerminal_getWindowsTerminalHeight

  (JNIEnv *, jobject) {

    HANDLE hStdOut;

    if ((hStdOut = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE) {

        return -1;

    }

    CONSOLE_SCREEN_BUFFER_INFO info;

    if (! GetConsoleScreenBufferInfo(hStdOut, &info)) {

        return -1;

    }

    return info.srWindow.Bottom - info.srWindow.Top + 1;

}