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// Copyright (C) 2012 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.extensions.registration;

import com.google.gerrit.common.Nullable;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.TypeLiteral;
import java.util.List;

class DynamicItemProvider implements Provider> {
  private final TypeLiteral type;
  private final Key> key;

  @Inject private Injector injector;

  DynamicItemProvider(TypeLiteral type, Key> key) {
    this.type = type;
    this.key = key;
  }

  @Override
  public DynamicItem get() {
    return new DynamicItem<>(key, find(injector, type), PluginName.GERRIT);
  }

  @Nullable
  private static  Provider find(Injector src, TypeLiteral type) {
    List> bindings = src.findBindingsByType(type);
    if (bindings != null && bindings.size() == 1) {
      return bindings.get(0).getProvider();
    } else if (bindings != null && bindings.size() > 1) {
      throw new ProvisionException(
          String.format(
              "Multiple providers bound for DynamicItem<%s>\n"
                  + "This is not allowed; check the server configuration.",
              type));
    } else {
      return null;
    }
  }
}