/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <node.h>

#include "grpc/grpc.h"
#include "grpc/support/time.h"
#include "byte_buffer.h"
#include "call.h"
#include "channel.h"
#include "completion_queue_async_worker.h"
#include "timeval.h"
#include "tag.h"

namespace grpc {
namespace node {

using ::node::Buffer;
using v8::Arguments;
using v8::Array;
using v8::Exception;
using v8::External;
using v8::Function;
using v8::FunctionTemplate;
using v8::Handle;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Persistent;
using v8::Uint32;
using v8::String;
using v8::Value;

Persistent<Function> Call::constructor;
Persistent<FunctionTemplate> Call::fun_tpl;

Call::Call(grpc_call *call) : wrapped_call(call) {}

Call::~Call() { grpc_call_destroy(wrapped_call); }

void Call::Init(Handle<Object> exports) {
  NanScope();
  Local<FunctionTemplate> tpl = FunctionTemplate::New(New);
  tpl->SetClassName(NanNew("Call"));
  tpl->InstanceTemplate()->SetInternalFieldCount(1);
  NanSetPrototypeTemplate(tpl, "addMetadata",
                          FunctionTemplate::New(AddMetadata)->GetFunction());
  NanSetPrototypeTemplate(tpl, "startInvoke",
                          FunctionTemplate::New(StartInvoke)->GetFunction());
  NanSetPrototypeTemplate(tpl, "serverAccept",
                          FunctionTemplate::New(ServerAccept)->GetFunction());
  NanSetPrototypeTemplate(
      tpl, "serverEndInitialMetadata",
      FunctionTemplate::New(ServerEndInitialMetadata)->GetFunction());
  NanSetPrototypeTemplate(tpl, "cancel",
                          FunctionTemplate::New(Cancel)->GetFunction());
  NanSetPrototypeTemplate(tpl, "startWrite",
                          FunctionTemplate::New(StartWrite)->GetFunction());
  NanSetPrototypeTemplate(
      tpl, "startWriteStatus",
      FunctionTemplate::New(StartWriteStatus)->GetFunction());
  NanSetPrototypeTemplate(tpl, "writesDone",
                          FunctionTemplate::New(WritesDone)->GetFunction());
  NanSetPrototypeTemplate(tpl, "startReadMetadata",
                          FunctionTemplate::New(WritesDone)->GetFunction());
  NanSetPrototypeTemplate(tpl, "startRead",
                          FunctionTemplate::New(StartRead)->GetFunction());
  NanAssignPersistent(fun_tpl, tpl);
  NanAssignPersistent(constructor, tpl->GetFunction());
  constructor->Set(NanNew("WRITE_BUFFER_HINT"),
                   NanNew<Uint32, uint32_t>(GRPC_WRITE_BUFFER_HINT));
  constructor->Set(NanNew("WRITE_NO_COMPRESS"),
                   NanNew<Uint32, uint32_t>(GRPC_WRITE_NO_COMPRESS));
  exports->Set(String::NewSymbol("Call"), constructor);
}

bool Call::HasInstance(Handle<Value> val) {
  NanScope();
  return NanHasInstance(fun_tpl, val);
}

Handle<Value> Call::WrapStruct(grpc_call *call) {
  NanEscapableScope();
  if (call == NULL) {
    return NanEscapeScope(NanNull());
  }
  const int argc = 1;
  Handle<Value> argv[argc] = {External::New(reinterpret_cast<void *>(call))};
  return NanEscapeScope(constructor->NewInstance(argc, argv));
}

NAN_METHOD(Call::New) {
  NanScope();

  if (args.IsConstructCall()) {
    Call *call;
    if (args[0]->IsExternal()) {
      // This option is used for wrapping an existing call
      grpc_call *call_value =
          reinterpret_cast<grpc_call *>(External::Unwrap(args[0]));
      call = new Call(call_value);
    } else {
      if (!Channel::HasInstance(args[0])) {
        return NanThrowTypeError("Call's first argument must be a Channel");
      }
      if (!args[1]->IsString()) {
        return NanThrowTypeError("Call's second argument must be a string");
      }
      if (!(args[2]->IsNumber() || args[2]->IsDate())) {
        return NanThrowTypeError(
            "Call's third argument must be a date or a number");
      }
      Handle<Object> channel_object = args[0]->ToObject();
      Channel *channel = ObjectWrap::Unwrap<Channel>(channel_object);
      if (channel->GetWrappedChannel() == NULL) {
        return NanThrowError("Call cannot be created from a closed channel");
      }
      NanUtf8String method(args[1]);
      double deadline = args[2]->NumberValue();
      grpc_channel *wrapped_channel = channel->GetWrappedChannel();
      grpc_call *wrapped_call =
          grpc_channel_create_call(wrapped_channel, *method, channel->GetHost(),
                                   MillisecondsToTimespec(deadline));
      call = new Call(wrapped_call);
      args.This()->SetHiddenValue(String::NewSymbol("channel_"),
                                  channel_object);
    }
    call->Wrap(args.This());
    NanReturnValue(args.This());
  } else {
    const int argc = 4;
    Local<Value> argv[argc] = {args[0], args[1], args[2], args[3]};
    NanReturnValue(constructor->NewInstance(argc, argv));
  }
}

NAN_METHOD(Call::AddMetadata) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("addMetadata can only be called on Call objects");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  for (int i = 0; !args[i]->IsUndefined(); i++) {
    if (!args[i]->IsObject()) {
      return NanThrowTypeError(
          "addMetadata arguments must be objects with key and value");
    }
    Handle<Object> item = args[i]->ToObject();
    Handle<Value> key = item->Get(NanNew("key"));
    if (!key->IsString()) {
      return NanThrowTypeError(
          "objects passed to addMetadata must have key->string");
    }
    Handle<Value> value = item->Get(NanNew("value"));
    if (!Buffer::HasInstance(value)) {
      return NanThrowTypeError(
          "objects passed to addMetadata must have value->Buffer");
    }
    grpc_metadata metadata;
    NanUtf8String utf8_key(key);
    metadata.key = *utf8_key;
    metadata.value = Buffer::Data(value);
    metadata.value_length = Buffer::Length(value);
    grpc_call_error error =
        grpc_call_add_metadata(call->wrapped_call, &metadata, 0);
    if (error != GRPC_CALL_OK) {
      return NanThrowError("addMetadata failed", error);
    }
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::StartInvoke) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("startInvoke can only be called on Call objects");
  }
  if (!args[0]->IsFunction()) {
    return NanThrowTypeError("StartInvoke's first argument must be a function");
  }
  if (!args[1]->IsFunction()) {
    return NanThrowTypeError(
        "StartInvoke's second argument must be a function");
  }
  if (!args[2]->IsFunction()) {
    return NanThrowTypeError("StartInvoke's third argument must be a function");
  }
  if (!args[3]->IsUint32()) {
    return NanThrowTypeError(
        "StartInvoke's fourth argument must be integer flags");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  unsigned int flags = args[3]->Uint32Value();
  grpc_call_error error = grpc_call_start_invoke(
      call->wrapped_call, CompletionQueueAsyncWorker::GetQueue(),
      CreateTag(args[0], args.This()), CreateTag(args[1], args.This()),
      CreateTag(args[2], args.This()), flags);
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
    CompletionQueueAsyncWorker::Next();
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("startInvoke failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::ServerAccept) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("accept can only be called on Call objects");
  }
  if (!args[0]->IsFunction()) {
    return NanThrowTypeError("accept's first argument must be a function");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  grpc_call_error error = grpc_call_server_accept(
      call->wrapped_call, CompletionQueueAsyncWorker::GetQueue(),
      CreateTag(args[0], args.This()));
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("serverAccept failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::ServerEndInitialMetadata) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError(
        "serverEndInitialMetadata can only be called on Call objects");
  }
  if (!args[0]->IsUint32()) {
    return NanThrowTypeError(
        "serverEndInitialMetadata's second argument must be integer flags");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  unsigned int flags = args[1]->Uint32Value();
  grpc_call_error error =
      grpc_call_server_end_initial_metadata(call->wrapped_call, flags);
  if (error != GRPC_CALL_OK) {
    return NanThrowError("serverEndInitialMetadata failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::Cancel) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("startInvoke can only be called on Call objects");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  grpc_call_error error = grpc_call_cancel(call->wrapped_call);
  if (error != GRPC_CALL_OK) {
    return NanThrowError("cancel failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::StartWrite) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("startWrite can only be called on Call objects");
  }
  if (!Buffer::HasInstance(args[0])) {
    return NanThrowTypeError("startWrite's first argument must be a Buffer");
  }
  if (!args[1]->IsFunction()) {
    return NanThrowTypeError("startWrite's second argument must be a function");
  }
  if (!args[2]->IsUint32()) {
    return NanThrowTypeError(
        "startWrite's third argument must be integer flags");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  grpc_byte_buffer *buffer = BufferToByteBuffer(args[0]);
  unsigned int flags = args[2]->Uint32Value();
  grpc_call_error error = grpc_call_start_write(
      call->wrapped_call, buffer, CreateTag(args[1], args.This()), flags);
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("startWrite failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::StartWriteStatus) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError(
        "startWriteStatus can only be called on Call objects");
  }
  if (!args[0]->IsUint32()) {
    return NanThrowTypeError(
        "startWriteStatus's first argument must be a status code");
  }
  if (!args[1]->IsString()) {
    return NanThrowTypeError(
        "startWriteStatus's second argument must be a string");
  }
  if (!args[2]->IsFunction()) {
    return NanThrowTypeError(
        "startWriteStatus's third argument must be a function");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  NanUtf8String details(args[1]);
  grpc_call_error error = grpc_call_start_write_status(
      call->wrapped_call, (grpc_status_code)args[0]->Uint32Value(), *details,
      CreateTag(args[2], args.This()));
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("startWriteStatus failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::WritesDone) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("writesDone can only be called on Call objects");
  }
  if (!args[0]->IsFunction()) {
    return NanThrowTypeError("writesDone's first argument must be a function");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  grpc_call_error error = grpc_call_writes_done(
      call->wrapped_call, CreateTag(args[0], args.This()));
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("writesDone failed", error);
  }
  NanReturnUndefined();
}

NAN_METHOD(Call::StartRead) {
  NanScope();
  if (!HasInstance(args.This())) {
    return NanThrowTypeError("startRead can only be called on Call objects");
  }
  if (!args[0]->IsFunction()) {
    return NanThrowTypeError("startRead's first argument must be a function");
  }
  Call *call = ObjectWrap::Unwrap<Call>(args.This());
  grpc_call_error error =
      grpc_call_start_read(call->wrapped_call, CreateTag(args[0], args.This()));
  if (error == GRPC_CALL_OK) {
    CompletionQueueAsyncWorker::Next();
  } else {
    return NanThrowError("startRead failed", error);
  }
  NanReturnUndefined();
}

}  // namespace node
}  // namespace grpc