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package org.jruby.ext.ffi.io;

import jnr.posix.FileStat;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyIO;
import org.jruby.RubyModule;
import org.jruby.RubyNumeric;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.io.ModeFlags;

import java.nio.channels.ByteChannel;

/**
 * An IO implementation that reads/writes to a native file descriptor.
 */
@JRubyClass(name="FFI::" + FileDescriptorIO.CLASS_NAME, parent="IO")
public class FileDescriptorIO extends RubyIO {
    public static final String CLASS_NAME = "FileDescriptorIO";
    private static final class Allocator implements ObjectAllocator {
        public final IRubyObject allocate(Ruby runtime, RubyClass klass) {
            return new FileDescriptorIO(runtime, klass);
        }
        private static final ObjectAllocator INSTANCE = new Allocator();
    }

    public FileDescriptorIO(Ruby runtime, RubyClass klass) {
        super(runtime, klass);
        MakeOpenFile();
    }

    public FileDescriptorIO(Ruby runtime, IRubyObject fd) {
        super(runtime, runtime.getModule("FFI").getClass(CLASS_NAME));
        MakeOpenFile();
        ModeFlags modes = newModeFlags(runtime, ModeFlags.RDWR);
        int fileno = RubyNumeric.fix2int(fd);
        FileStat stat = runtime.getPosix().fstat(fileno);
        ByteChannel channel;

        if (stat.isSocket()) {
            channel = new jnr.enxio.channels.NativeSocketChannel(fileno);
        } else if (stat.isBlockDev() || stat.isCharDev()) {
            channel = new jnr.enxio.channels.NativeDeviceChannel(fileno);
        } else {
            channel = new FileDescriptorByteChannel(runtime, fileno);
        }

//        openFile.setMainStream(ChannelStream.open(getRuntime(), new ChannelDescriptor(channel, modes, FileDescriptorHelper.wrap(fileno))));
        openFile.setChannel(channel);
        openFile.setMode(modes.getOpenFileFlags());
        openFile.setMode(modes.getOpenFileFlags());
        openFile.setSync(true);
    }

    public static RubyClass createFileDescriptorIOClass(Ruby runtime, RubyModule module) {
        RubyClass result = runtime.defineClassUnder(CLASS_NAME, runtime.getClass("IO"),
                Allocator.INSTANCE, module);
        result.defineAnnotatedMethods(FileDescriptorIO.class);
        result.defineAnnotatedConstants(FileDescriptorIO.class);

        return result;
    }

    @JRubyMethod(name = "new", meta = true)
    public static FileDescriptorIO newInstance(ThreadContext context, IRubyObject recv, IRubyObject fd) {
        return new FileDescriptorIO(context.runtime, fd);
    }

    @JRubyMethod(name = "wrap", required = 1, meta = true)
    public static RubyIO wrap(ThreadContext context, IRubyObject recv, IRubyObject fd) {
        return new FileDescriptorIO(context.runtime, fd);
    }

    static class FileDescriptorHelper {
        static java.lang.reflect.Constructor CONSTRUCTOR;
        static {
            java.lang.reflect.Constructor constructor;
            try {
                constructor = java.io.FileDescriptor.class.getDeclaredConstructor(int.class);
                constructor.setAccessible(true);
            } catch (Throwable t) {
                constructor = null;
            }
            CONSTRUCTOR = constructor;
        }

        public static java.io.FileDescriptor wrap(int fileno) {
            try {
                return CONSTRUCTOR != null ? CONSTRUCTOR.newInstance(fileno) : new java.io.FileDescriptor();
            } catch (IllegalAccessException iae) {
                return new java.io.FileDescriptor();
            } catch (InstantiationException ie) {
                return new java.io.FileDescriptor();
            } catch (java.lang.reflect.InvocationTargetException ite) {
                return new java.io.FileDescriptor();
            }
        }
    }
}