/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "RCTObjcExecutor.h"

#import <React/RCTCxxUtils.h>
#import <React/RCTFollyConvert.h>
#import <React/RCTJavaScriptExecutor.h>
#import <React/RCTLog.h>
#import <React/RCTProfile.h>
#import <React/RCTUtils.h>
#import <cxxreact/JSBigString.h>
#import <cxxreact/JSExecutor.h>
#import <cxxreact/MessageQueueThread.h>
#import <cxxreact/ModuleRegistry.h>
#import <folly/json.h>

namespace facebook {
namespace react {

namespace {

class JSEException : public std::runtime_error {
public:
  JSEException(NSError *error)
    : runtime_error([[error description] UTF8String]) {}
};

class RCTObjcExecutor : public JSExecutor {
public:
  RCTObjcExecutor(id<RCTJavaScriptExecutor> jse,
                  RCTJavaScriptCompleteBlock errorBlock,
                  std::shared_ptr<MessageQueueThread> jsThread,
                  std::shared_ptr<ExecutorDelegate> delegate)
    : m_jse(jse)
    , m_errorBlock(errorBlock)
    , m_jsThread(std::move(jsThread))
    , m_delegate(std::move(delegate))
  {
    m_jsCallback = ^(id json, NSError *error) {
      if (error) {
        // Do not use "m_errorBlock" here as the bridge might be in the middle
        // of invalidation as a result of error handling and "this" can be
        // already deallocated.
        errorBlock(error);
        return;
      }

      m_jsThread->runOnQueue([this, json]{
        m_delegate->callNativeModules(*this, convertIdToFollyDynamic(json), true);
      });
    };

    // Synchronously initialize the executor
    [jse setUp];

    folly::dynamic nativeModuleConfig = folly::dynamic::array;
    auto moduleRegistry = m_delegate->getModuleRegistry();
    for (const auto &name : moduleRegistry->moduleNames()) {
      auto config = moduleRegistry->getConfig(name);
      nativeModuleConfig.push_back(config ? config->config : nullptr);
    }

    folly::dynamic config =
      folly::dynamic::object("remoteModuleConfig", std::move(nativeModuleConfig));

    setGlobalVariable(
      "__fbBatchedBridgeConfig",
      std::make_unique<JSBigStdString>(folly::toJson(config)));
  }

  void loadApplicationScript(
      std::unique_ptr<const JSBigString> script,
      std::string sourceURL) override {
    RCTProfileBeginFlowEvent();
    [m_jse executeApplicationScript:[NSData dataWithBytes:script->c_str() length:script->size()]
           sourceURL:[[NSURL alloc]
                         initWithString:@(sourceURL.c_str())]
           onComplete:^(NSError *error) {
        RCTProfileEndFlowEvent();

        if (error) {
          m_errorBlock(error);
          return;
        }

        [m_jse flushedQueue:m_jsCallback];
      }];
  }

  void setBundleRegistry(std::unique_ptr<RAMBundleRegistry>) override {
    RCTAssert(NO, @"RAM bundles are not supported in RCTObjcExecutor");
  }

  void registerBundle(uint32_t bundleId, const std::string &bundlePath) override {
    RCTAssert(NO, @"RAM bundles are not supported in RCTObjcExecutor");
  }

  void callFunction(const std::string &module, const std::string &method,
                    const folly::dynamic &arguments) override {
    [m_jse callFunctionOnModule:@(module.c_str())
           method:@(method.c_str())
           arguments:convertFollyDynamicToId(arguments)
           callback:m_jsCallback];
  }

  void invokeCallback(double callbackId, const folly::dynamic &arguments) override {
    [m_jse invokeCallbackID:@(callbackId)
           arguments:convertFollyDynamicToId(arguments)
           callback:m_jsCallback];
  }

  virtual void setGlobalVariable(
      std::string propName,
      std::unique_ptr<const JSBigString> jsonValue) override {
    [m_jse injectJSONText:@(jsonValue->c_str())
           asGlobalObjectNamed:@(propName.c_str())
           callback:m_errorBlock];
  }

  virtual std::string getDescription() override {
    return [NSStringFromClass([m_jse class]) UTF8String];
  }

private:
  id<RCTJavaScriptExecutor> m_jse;
  RCTJavaScriptCompleteBlock m_errorBlock;
  std::shared_ptr<ExecutorDelegate> m_delegate;
  std::shared_ptr<MessageQueueThread> m_jsThread;
  RCTJavaScriptCallback m_jsCallback;
};

}

RCTObjcExecutorFactory::RCTObjcExecutorFactory(
  id<RCTJavaScriptExecutor> jse, RCTJavaScriptCompleteBlock errorBlock)
  : m_jse(jse)
  , m_errorBlock(errorBlock) {}

std::unique_ptr<JSExecutor> RCTObjcExecutorFactory::createJSExecutor(
    std::shared_ptr<ExecutorDelegate> delegate,
    std::shared_ptr<MessageQueueThread> jsQueue) {
  return std::unique_ptr<JSExecutor>(
    new RCTObjcExecutor(m_jse, m_errorBlock, jsQueue, delegate));
}

}
}