package org.msgpack.jruby;

import org.jruby.Ruby; import org.jruby.RubyModule; import org.jruby.RubyClass; import org.jruby.RubyObject; import org.jruby.RubyArray; import org.jruby.RubyHash; import org.jruby.RubyIO; import org.jruby.RubyInteger; import org.jruby.RubyFixnum; import org.jruby.RubyString; import org.jruby.RubySymbol; import org.jruby.runtime.builtin.IRubyObject; import org.jruby.anno.JRubyClass; import org.jruby.anno.JRubyMethod; import org.jruby.runtime.ThreadContext; import org.jruby.runtime.ObjectAllocator; import org.jruby.util.ByteList;

import static org.jruby.runtime.Visibility.PRIVATE;

@JRubyClass(name=“MessagePack::Factory”) public class Factory extends RubyObject {

private final Ruby runtime;
private final ExtensionRegistry extensionRegistry;
private boolean hasSymbolExtType;

public Factory(Ruby runtime, RubyClass type) {
  super(runtime, type);
  this.runtime = runtime;
  this.extensionRegistry = new ExtensionRegistry();
  this.hasSymbolExtType = false;
}

static class FactoryAllocator implements ObjectAllocator {
  public IRubyObject allocate(Ruby runtime, RubyClass type) {
    return new Factory(runtime, type);
  }
}

public ExtensionRegistry extensionRegistry() {
  return extensionRegistry.dup();
}

@JRubyMethod(name = "initialize")
public IRubyObject initialize(ThreadContext ctx) {
  return this;
}

@JRubyMethod(name = "packer", optional = 1)
public Packer packer(ThreadContext ctx, IRubyObject[] args) {
  return Packer.newPacker(ctx, extensionRegistry(), hasSymbolExtType, args);
}

@JRubyMethod(name = "unpacker", optional = 1)
public Unpacker unpacker(ThreadContext ctx, IRubyObject[] args) {
  return Unpacker.newUnpacker(ctx, extensionRegistry(), args);
}

@JRubyMethod(name = "registered_types_internal", visibility = PRIVATE)
public IRubyObject registeredTypesInternal(ThreadContext ctx) {
  return RubyArray.newArray(ctx.getRuntime(), new IRubyObject[] {
    extensionRegistry.toInternalPackerRegistry(ctx),
    extensionRegistry.toInternalUnpackerRegistry(ctx)
  });
}

@JRubyMethod(name = "register_type", required = 2, optional = 1)
public IRubyObject registerType(ThreadContext ctx, IRubyObject[] args) {
  Ruby runtime = ctx.getRuntime();
  IRubyObject type = args[0];
  IRubyObject mod = args[1];

  IRubyObject packerArg;
  IRubyObject unpackerArg;

  if (isFrozen()) {
      throw runtime.newRuntimeError("can't modify frozen Factory");
  }

  if (args.length == 2) {
    packerArg = runtime.newSymbol("to_msgpack_ext");
    unpackerArg = runtime.newSymbol("from_msgpack_ext");
  } else if (args.length == 3) {
    if (args[args.length - 1] instanceof RubyHash) {
      RubyHash options = (RubyHash) args[args.length - 1];
      packerArg = options.fastARef(runtime.newSymbol("packer"));
      unpackerArg = options.fastARef(runtime.newSymbol("unpacker"));
    } else {
      throw runtime.newArgumentError(String.format("expected Hash but found %s.", args[args.length - 1].getType().getName()));
    }
  } else {
    throw runtime.newArgumentError(String.format("wrong number of arguments (%d for 2..3)", 2 + args.length));
  }

  long typeId = ((RubyFixnum) type).getLongValue();
  if (typeId < -128 || typeId > 127) {
    throw runtime.newRangeError(String.format("integer %d too big to convert to `signed char'", typeId));
  }

  if (!(mod instanceof RubyModule)) {
    throw runtime.newArgumentError(String.format("expected Module/Class but found %s.", mod.getType().getName()));
  }
  RubyModule extModule = (RubyModule) mod;

  IRubyObject packerProc = runtime.getNil();
  IRubyObject unpackerProc = runtime.getNil();
  if (packerArg != null) {
    packerProc = packerArg.callMethod(ctx, "to_proc");
  }
  if (unpackerArg != null) {
    if (unpackerArg instanceof RubyString || unpackerArg instanceof RubySymbol) {
      unpackerProc = extModule.method(unpackerArg.callMethod(ctx, "to_sym"));
    } else {
      unpackerProc = unpackerArg.callMethod(ctx, "method", runtime.newSymbol("call"));
    }
  }

  extensionRegistry.put(extModule, (int) typeId, packerProc, packerArg, unpackerProc, unpackerArg);

  if (extModule == runtime.getSymbol()) {
    hasSymbolExtType = true;
  }

  return runtime.getNil();
}

}