// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "node_stat_watcher.h"

#include "async_wrap-inl.h"

#include "env-inl.h"

#include "memory_tracker-inl.h"

#include "node_external_reference.h"

#include "node_file-inl.h"

#include "permission/permission.h"

#include "util-inl.h"

#include <cstring>

#include <cstdlib>

namespace node {

using v8::Context;

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::HandleScope;

using v8::Integer;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::ObjectTemplate;

using v8::Uint32;

using v8::Value;

void StatWatcher::CreatePerIsolateProperties(IsolateData* isolate_data,

                                             Local<ObjectTemplate> target) {

  Isolate* isolate = isolate_data->isolate();

  Local<FunctionTemplate> t = NewFunctionTemplate(isolate, StatWatcher::New);

  t->InstanceTemplate()->SetInternalFieldCount(

      StatWatcher::kInternalFieldCount);

  t->Inherit(HandleWrap::GetConstructorTemplate(isolate_data));

  SetProtoMethod(isolate, t, "start", StatWatcher::Start);

  SetConstructorFunction(isolate, target, "StatWatcher", t);

}

void StatWatcher::RegisterExternalReferences(

    ExternalReferenceRegistry* registry) {

  registry->Register(StatWatcher::New);

  registry->Register(StatWatcher::Start);

}

StatWatcher::StatWatcher(fs::BindingData* binding_data,

                         Local<Object> wrap,

                         bool use_bigint)

    : HandleWrap(binding_data->env(),

                 wrap,

                 reinterpret_cast<uv_handle_t*>(&watcher_),

                 AsyncWrap::PROVIDER_STATWATCHER),

      use_bigint_(use_bigint),

      binding_data_(binding_data) {

  CHECK_EQ(0, uv_fs_poll_init(env()->event_loop(), &watcher_));

}

void StatWatcher::Callback(uv_fs_poll_t* handle,

                           int status,

                           const uv_stat_t* prev,

                           const uv_stat_t* curr) {

  StatWatcher* wrap = ContainerOf(&StatWatcher::watcher_, handle);

  Environment* env = wrap->env();

  HandleScope handle_scope(env->isolate());

  Context::Scope context_scope(env->context());

  Local<Value> arr = fs::FillGlobalStatsArray(

      wrap->binding_data_.get(), wrap->use_bigint_, curr);

  USE(fs::FillGlobalStatsArray(

      wrap->binding_data_.get(), wrap->use_bigint_, prev, true));

  Local<Value> argv[2] = { Integer::New(env->isolate(), status), arr };

  wrap->MakeCallback(env->onchange_string(), arraysize(argv), argv);

}

void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {

  CHECK(args.IsConstructCall());

  fs::BindingData* binding_data = Realm::GetBindingData<fs::BindingData>(args);

  new StatWatcher(binding_data, args.This(), args[0]->IsTrue());

}

// wrap.start(filename, interval)

void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {

  CHECK_EQ(args.Length(), 2);

  StatWatcher* wrap;

  ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

  CHECK(!uv_is_active(wrap->GetHandle()));

  node::Utf8Value path(args.GetIsolate(), args[0]);

  CHECK_NOT_NULL(*path);

  THROW_IF_INSUFFICIENT_PERMISSIONS(

      wrap->env(),

      permission::PermissionScope::kFileSystemRead,

      path.ToStringView());

  CHECK(args[1]->IsUint32());

  const uint32_t interval = args[1].As<Uint32>()->Value();

  // Note that uv_fs_poll_start does not return ENOENT, we are handling

  // mostly memory errors here.

  const int err = uv_fs_poll_start(&wrap->watcher_, Callback, *path, interval);

  if (err != 0) {

    args.GetReturnValue().Set(err);

  }

}

}  // namespace node