/* 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 "sqlite3.h"

#include "jsfriendapi.h"

#include "nsPrintfCString.h"
#include "nsString.h"
#include "nsError.h"
#include "mozilla/Mutex.h"
#include "mozilla/CondVar.h"
#include "nsThreadUtils.h"
#include "nsJSUtils.h"
#include "nsIInterfaceRequestorUtils.h"

#include "Variant.h"
#include "mozStoragePrivateHelpers.h"
#include "mozIStorageCompletionCallback.h"

#include "mozilla/Logging.h"
extern mozilla::LazyLogModule gStorageLog;

namespace mozilla {
namespace storage {

bool isErrorCode(int aSQLiteResultCode) {
  // Drop off the extended result bits of the result code.
  int rc = aSQLiteResultCode & 0xFF;

  return rc != SQLITE_OK && rc != SQLITE_ROW && rc != SQLITE_DONE;
}

nsresult convertResultCode(int aSQLiteResultCode) {
  // Drop off the extended result bits of the result code.
  int rc = aSQLiteResultCode & 0xFF;

  switch (rc) {
    case SQLITE_OK:
    case SQLITE_ROW:
    case SQLITE_DONE:
      return NS_OK;
    case SQLITE_CORRUPT:
    case SQLITE_NOTADB:
      return NS_ERROR_FILE_CORRUPTED;
    case SQLITE_PERM:
    case SQLITE_CANTOPEN:
      return NS_ERROR_FILE_ACCESS_DENIED;
    case SQLITE_PROTOCOL:  // WAL locking race; transient like SQLITE_BUSY.
    case SQLITE_BUSY:
      return NS_ERROR_STORAGE_BUSY;
    case SQLITE_LOCKED:
      return NS_ERROR_FILE_IS_LOCKED;
    case SQLITE_READONLY:
      return NS_ERROR_FILE_READ_ONLY;
    case SQLITE_IOERR:
      return NS_ERROR_STORAGE_IOERR;
    case SQLITE_FULL:
    case SQLITE_NOLFS:
    case SQLITE_TOOBIG:
      return NS_ERROR_FILE_NO_DEVICE_SPACE;
    case SQLITE_NOMEM:
      return NS_ERROR_OUT_OF_MEMORY;
    case SQLITE_MISMATCH:
    case SQLITE_MISUSE:
    case SQLITE_RANGE:
      return NS_ERROR_UNEXPECTED;
    case SQLITE_ABORT:
    case SQLITE_INTERRUPT:
      return NS_ERROR_ABORT;
    case SQLITE_CONSTRAINT:
      return NS_ERROR_STORAGE_CONSTRAINT;
  }

    // generic error
#ifdef DEBUG
  nsAutoCString message;
  message.AppendLiteral("SQLite returned error code ");
  message.AppendInt(rc);
  message.AppendLiteral(" , Storage will convert it to NS_ERROR_FAILURE");
  NS_WARNING_ASSERTION(rc == SQLITE_ERROR, message.get());
#endif
  return NS_ERROR_FAILURE;
}

void checkAndLogStatementPerformance(sqlite3_stmt* aStatement) {
  // Check to see if the query performed sorting operations or not.  If it
  // did, it may need to be optimized!
  int count = ::sqlite3_stmt_status(aStatement, SQLITE_STMTSTATUS_SORT, 1);
  if (count <= 0) return;

  const char* sql = ::sqlite3_sql(aStatement);

  // Check to see if this is marked to not warn
  if (::strstr(sql, "/* do not warn (bug ")) return;

  // CREATE INDEX always sorts (sorting is a necessary step in creating
  // an index).  So ignore the warning there.
  if (::strstr(sql, "CREATE INDEX") || ::strstr(sql, "CREATE UNIQUE INDEX")) {
    return;
  }

#define STORAGE_WARNINGS_URL \
  "https://firefox-source-docs.mozilla.org/storage/warnings.html"
  NS_WARNING(nsPrintfCString("Suboptimal indexes for the SQL statement `%s` "
                             "[%d sort operation(s)] (" STORAGE_WARNINGS_URL
                             ").",
                             sql, count)
                 .get());
#undef STORAGE_WARNINGS_URL
}

already_AddRefed<nsIVariant> convertJSValToVariant(JSContext* aCtx,
                                                   const JS::Value& aValue) {
  if (aValue.isInt32()) {
    return MakeAndAddRef<IntegerVariant>(aValue.toInt32());
  }

  if (aValue.isDouble()) {
    return MakeAndAddRef<FloatVariant>(aValue.toDouble());
  }

  if (aValue.isString()) {
    nsAutoJSString value;
    if (!value.init(aCtx, aValue.toString())) {
      return nullptr;
    }
    return MakeAndAddRef<TextVariant>(value);
  }

  if (aValue.isBoolean()) {
    return MakeAndAddRef<IntegerVariant>(aValue.isTrue() ? 1 : 0);
  }

  if (aValue.isNull()) {
    return MakeAndAddRef<NullVariant>();
  }

  if (aValue.isObject()) {
    JS::Rooted<JSObject*> obj(aCtx, &aValue.toObject());
    // We only support Date instances, all others fail.
    bool valid;
    if (!js::DateIsValid(aCtx, obj, &valid) || !valid) {
      return nullptr;
    }

    double msecd;
    if (!js::DateGetMsecSinceEpoch(aCtx, obj, &msecd)) {
      return nullptr;
    }

    msecd *= 1000.0;
    int64_t msec = msecd;

    return MakeAndAddRef<IntegerVariant>(msec);
  }

  return nullptr;
}

already_AddRefed<Variant_base> convertVariantToStorageVariant(
    nsIVariant* aVariant) {
  nsCOMPtr<nsIInterfaceRequestor> variant = do_QueryInterface(aVariant);
  if (variant) {
    // JS helpers already convert the JS representation to a Storage Variant,
    // in such a case there's nothing left to do here, so just pass-through.
    RefPtr<Variant_base> variantObj = do_GetInterface(variant);
    if (variantObj) {
      return variantObj.forget();
    }
  }

  if (!aVariant) {
    return MakeAndAddRef<NullVariant>();
  }

  uint16_t dataType = aVariant->GetDataType();

  switch (dataType) {
    case nsIDataType::VTYPE_BOOL:
    case nsIDataType::VTYPE_INT8:
    case nsIDataType::VTYPE_INT16:
    case nsIDataType::VTYPE_INT32:
    case nsIDataType::VTYPE_UINT8:
    case nsIDataType::VTYPE_UINT16:
    case nsIDataType::VTYPE_UINT32:
    case nsIDataType::VTYPE_INT64:
    case nsIDataType::VTYPE_UINT64: {
      int64_t v;
      nsresult rv = aVariant->GetAsInt64(&v);
      NS_ENSURE_SUCCESS(rv, nullptr);
      return MakeAndAddRef<IntegerVariant>(v);
    }
    case nsIDataType::VTYPE_FLOAT:
    case nsIDataType::VTYPE_DOUBLE: {
      double v;
      nsresult rv = aVariant->GetAsDouble(&v);
      NS_ENSURE_SUCCESS(rv, nullptr);
      return MakeAndAddRef<FloatVariant>(v);
    }
    case nsIDataType::VTYPE_CHAR:
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING: {
      nsCString v;
      nsresult rv = aVariant->GetAsAUTF8String(v);
      NS_ENSURE_SUCCESS(rv, nullptr);
      return MakeAndAddRef<UTF8TextVariant>(v);
    }
    case nsIDataType::VTYPE_WCHAR:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
    case nsIDataType::VTYPE_ASTRING: {
      nsString v;
      nsresult rv = aVariant->GetAsAString(v);
      NS_ENSURE_SUCCESS(rv, nullptr);
      return MakeAndAddRef<TextVariant>(v);
    }
    case nsIDataType::VTYPE_EMPTY:
    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_VOID:
      return MakeAndAddRef<NullVariant>();
    case nsIDataType::VTYPE_ARRAY: {
      uint16_t type;
      nsIID iid;
      uint32_t len;
      void* rawArray;
      // Note this copies the array data.
      nsresult rv = aVariant->GetAsArray(&type, &iid, &len, &rawArray);
      NS_ENSURE_SUCCESS(rv, nullptr);
      if (type == nsIDataType::VTYPE_UINT8) {
        std::pair<uint8_t*, int> v(static_cast<uint8_t*>(rawArray), len);
        // Take ownership of the data avoiding a further copy.
        return MakeAndAddRef<AdoptedBlobVariant>(v);
      }
      // We don't convert other kind of arrays because it makes the API more
      // error prone, especially on the javascript side where it may not be
      // so uncommon to mistakenly pass an array instead of a primitive.
      // Consumers should instead use the dedicated `BindArrayOf` methods.
      [[fallthrough]];
    }
    case nsIDataType::VTYPE_ID:
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
    default:
      NS_WARNING(
          nsPrintfCString("Unsupported variant type: %d", dataType).get());
      MOZ_ASSERT_UNREACHABLE("Tried to bind an unsupported Variant type");
      return nullptr;
  }
}

namespace {
class CallbackEvent : public Runnable {
 public:
  explicit CallbackEvent(mozIStorageCompletionCallback* aCallback)
      : Runnable("storage::CallbackEvent"), mCallback(aCallback) {}

  NS_IMETHOD Run() override {
    (void)mCallback->Complete(NS_OK, nullptr);
    return NS_OK;
  }

 private:
  nsCOMPtr<mozIStorageCompletionCallback> mCallback;
};
}  // namespace
already_AddRefed<nsIRunnable> newCompletionEvent(
    mozIStorageCompletionCallback* aCallback) {
  NS_ASSERTION(aCallback, "Passing a null callback is a no-no!");
  return MakeAndAddRef<CallbackEvent>(aCallback);
}

}  // namespace storage
}  // namespace mozilla