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package org.jruby.util;

import jnr.ffi.*;
import jnr.ffi.LibraryOption;
import jnr.ffi.Runtime;
import jnr.ffi.annotations.Out;
import jnr.ffi.byref.IntByReference;
import jnr.ffi.types.intptr_t;
import jnr.ffi.types.uintptr_t;

import java.util.HashMap;
import java.util.Map;

/**
 * A binding of a few key win32 functions we need to behave properly.
 */
public class WindowsFFI {
    public static interface Kernel32 {
        public static final int PROCESS_QUERY_INFORMATION  = 0x0400;
        public static final int ERROR_INVALID_PARAMETER = 0x57;
        public static final int PROCESS_TERMINATE  = 0x0001;
        public static final int STILL_ACTIVE = 259;
        
        int GetProcessId(@intptr_t long handle);
        jnr.ffi.Pointer OpenProcess(int dwDesiredAccess, int bInheritHandle, int dwProcessId);
        int CloseHandle(jnr.ffi.Pointer handle);
        int GetLastError();
        int GetExitCodeProcess(jnr.ffi.Pointer hProcess, @Out IntByReference pointerToExitCodeDword);
        int TerminateProcess(jnr.ffi.Pointer hProcess, int uExitCode);
    }

    private static final class SingletonHolder {
        static final Kernel32 Kernel32 = LibraryLoader.create(Kernel32.class)
                .convention(CallingConvention.STDCALL)
                .load("Kernel32");
    }

    public static Kernel32 getKernel32() {
        return kernel32();
    }

    public static Kernel32 kernel32() {
        return SingletonHolder.Kernel32;
    }
}