/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIXPConnect.h"

#include "mozStorageStatement.h"

#include "mozStorageService.h"

#include "nsMemory.h"

#include "nsString.h"

#include "nsServiceManagerUtils.h"

#include "mozStorageStatementJSHelper.h"

#include "mozStorageStatementRow.h"

#include "mozStorageStatementParams.h"

#include "jsapi.h"

#include "xpc_make_class.h"

#include "mozilla/Services.h"

namespace mozilla {

namespace storage {

////////////////////////////////////////////////////////////////////////////////

//// Global Functions

static

bool

stepFunc(JSContext *aCtx, uint32_t argc, JS::Value *_vp)

{

  JS::CallArgs args = CallArgsFromVp(argc, _vp);

  nsCOMPtr<nsIXPConnect> xpc(nsIXPConnect::XPConnect());

  nsCOMPtr<nsIXPConnectWrappedNative> wrapper;

  if (!args.thisv().isObject()) {

    ::JS_ReportErrorASCII(aCtx, "mozIStorageStatement::step() requires object");

    return false;

  }

  JSObject *obj = &args.thisv().toObject();

  nsresult rv =

    xpc->GetWrappedNativeOfJSObject(aCtx, obj, getter_AddRefs(wrapper));

  if (NS_FAILED(rv)) {

    ::JS_ReportErrorASCII(aCtx, "mozIStorageStatement::step() could not obtain native statement");

    return false;

  }

#ifdef DEBUG

  {

    nsCOMPtr<mozIStorageStatement> isStatement(

      do_QueryInterface(wrapper->Native())

    );

    NS_ASSERTION(isStatement, "How is this not a statement?!");

  }

#endif

  Statement *stmt = static_cast<Statement *>(

    static_cast<mozIStorageStatement *>(wrapper->Native())

  );

  bool hasMore = false;

  rv = stmt->ExecuteStep(&hasMore);

  if (NS_SUCCEEDED(rv) && !hasMore) {

    args.rval().setBoolean(false);

    (void)stmt->Reset();

    return true;

  }

  if (NS_FAILED(rv)) {

    ::JS_ReportErrorASCII(aCtx, "mozIStorageStatement::step() returned an error");

    return false;

  }

  args.rval().setBoolean(hasMore);

  return true;

}

////////////////////////////////////////////////////////////////////////////////

//// StatementJSHelper

nsresult

StatementJSHelper::getRow(Statement *aStatement,

                          JSContext *aCtx,

                          JSObject *aScopeObj,

                          JS::Value *_row)

{

  MOZ_ASSERT(NS_IsMainThread());

#ifdef DEBUG

  int32_t state;

  (void)aStatement->GetState(&state);

  NS_ASSERTION(state == mozIStorageStatement::MOZ_STORAGE_STATEMENT_EXECUTING,

               "Invalid state to get the row object - all calls will fail!");

#endif

  JS::RootedObject scope(aCtx, aScopeObj);

  if (!aStatement->mStatementRowHolder) {

    dom::GlobalObject global(aCtx, scope);

    if (global.Failed()) {

      return NS_ERROR_UNEXPECTED;

    }

    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global.GetAsSupports());

    RefPtr<StatementRow> row(new StatementRow(window, aStatement));

    NS_ENSURE_TRUE(row, NS_ERROR_OUT_OF_MEMORY);

    RefPtr<StatementRowHolder> rowHolder = new StatementRowHolder(row);

    NS_ENSURE_TRUE(rowHolder, NS_ERROR_OUT_OF_MEMORY);

    aStatement->mStatementRowHolder =

      new nsMainThreadPtrHolder<StatementRowHolder>(

        "Statement::mStatementRowHolder", rowHolder);

  }

  RefPtr<StatementRow> row(aStatement->mStatementRowHolder->Get());

  JSObject* obj = row->WrapObject(aCtx, nullptr);

  if (!obj) {

    return NS_ERROR_UNEXPECTED;

  }

  _row->setObject(*obj);

  return NS_OK;

}

nsresult

StatementJSHelper::getParams(Statement *aStatement,

                             JSContext *aCtx,

                             JSObject *aScopeObj,

                             JS::Value *_params)

{

  MOZ_ASSERT(NS_IsMainThread());

#ifdef DEBUG

  int32_t state;

  (void)aStatement->GetState(&state);

  NS_ASSERTION(state == mozIStorageStatement::MOZ_STORAGE_STATEMENT_READY,

               "Invalid state to get the params object - all calls will fail!");

#endif

  JS::RootedObject scope(aCtx, aScopeObj);

  if (!aStatement->mStatementParamsHolder) {

    dom::GlobalObject global(aCtx, scope);

    if (global.Failed()) {

      return NS_ERROR_UNEXPECTED;

    }

    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global.GetAsSupports());

    RefPtr<StatementParams> params(new StatementParams(window, aStatement));

    NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);

    RefPtr<StatementParamsHolder> paramsHolder = new StatementParamsHolder(params);

    NS_ENSURE_TRUE(paramsHolder, NS_ERROR_OUT_OF_MEMORY);

    aStatement->mStatementParamsHolder =

      new nsMainThreadPtrHolder<StatementParamsHolder>(

        "Statement::mStatementParamsHolder", paramsHolder);

  }

  RefPtr<StatementParams> params(aStatement->mStatementParamsHolder->Get());

  JSObject* obj = params->WrapObject(aCtx, nullptr);

  if (!obj) {

    return NS_ERROR_UNEXPECTED;

  }

  _params->setObject(*obj);

  return NS_OK;

}

NS_IMETHODIMP_(MozExternalRefCountType) StatementJSHelper::AddRef() { return 2; }

NS_IMETHODIMP_(MozExternalRefCountType) StatementJSHelper::Release() { return 1; }

NS_INTERFACE_MAP_BEGIN(StatementJSHelper)

  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

////////////////////////////////////////////////////////////////////////////////

//// nsIXPCScriptable

#define XPC_MAP_CLASSNAME         StatementJSHelper

#define XPC_MAP_QUOTED_CLASSNAME "StatementJSHelper"

#define XPC_MAP_FLAGS (XPC_SCRIPTABLE_WANT_RESOLVE | \

                       XPC_SCRIPTABLE_ALLOW_PROP_MODS_DURING_RESOLVE)

#include "xpc_map_end.h"

NS_IMETHODIMP

StatementJSHelper::Resolve(nsIXPConnectWrappedNative *aWrapper,

                           JSContext *aCtx, JSObject *aScopeObj,

                           jsid aId, bool *aResolvedp,

                           bool *_retval)

{

  if (!JSID_IS_STRING(aId))

    return NS_OK;

  JS::Rooted<JSObject*> scope(aCtx, aScopeObj);

  JS::Rooted<jsid> id(aCtx, aId);

#ifdef DEBUG

  {

    nsCOMPtr<mozIStorageStatement> isStatement(

                                     do_QueryInterface(aWrapper->Native()));

    NS_ASSERTION(isStatement, "How is this not a statement?!");

  }

#endif

  Statement *stmt = static_cast<Statement *>(

    static_cast<mozIStorageStatement *>(aWrapper->Native())

  );

  JSFlatString* str = JSID_TO_FLAT_STRING(id);

  if (::JS_FlatStringEqualsAscii(str, "step")) {

    *_retval = ::JS_DefineFunction(aCtx, scope, "step", stepFunc,

                                   0, JSPROP_RESOLVING) != nullptr;

    *aResolvedp = true;

    return NS_OK;

  }

  JS::RootedValue val(aCtx);

  if (::JS_FlatStringEqualsAscii(str, "row")) {

    nsresult rv = getRow(stmt, aCtx, scope, val.address());

    NS_ENSURE_SUCCESS(rv, rv);

    *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);

    *aResolvedp = true;

    return NS_OK;

  }

  if (::JS_FlatStringEqualsAscii(str, "params")) {

    nsresult rv = getParams(stmt, aCtx, scope, val.address());

    NS_ENSURE_SUCCESS(rv, rv);

    *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);

    *aResolvedp = true;

    return NS_OK;

  }

  return NS_OK;

}

NS_IMPL_ISUPPORTS0(StatementParamsHolder);

StatementParamsHolder::~StatementParamsHolder()

{

  MOZ_ASSERT(NS_IsMainThread());

  // We are considered dead at this point, so any wrappers for row or params

  // need to lose their reference to the statement.

  mParams->mStatement = nullptr;

}

NS_IMPL_ISUPPORTS0(StatementRowHolder);

StatementRowHolder::~StatementRowHolder()

{

  MOZ_ASSERT(NS_IsMainThread());

  // We are considered dead at this point, so any wrappers for row or params

  // need to lose their reference to the statement.

  mRow->mStatement = nullptr;

}

} // namespace storage

} // namespace mozilla