/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.facebook.react;

import com.facebook.react.bridge.ModuleHolder;
import com.facebook.react.bridge.NativeModuleRegistry;
import com.facebook.react.bridge.ReactApplicationContext;
import java.util.HashMap;
import java.util.Map;

/** Helper class to build NativeModuleRegistry. */
public class NativeModuleRegistryBuilder {

  private final ReactApplicationContext mReactApplicationContext;

  private final Map<String, ModuleHolder> mModules = new HashMap<>();

  public NativeModuleRegistryBuilder(
      ReactApplicationContext reactApplicationContext, ReactInstanceManager reactInstanceManager) {
    mReactApplicationContext = reactApplicationContext;
  }

  public void processPackage(ReactPackage reactPackage) {
    // We use an iterable instead of an iterator here to ensure thread safety, and that this list
    // cannot be modified
    Iterable<ModuleHolder> moduleHolders;
    if (reactPackage instanceof LazyReactPackage) {
      moduleHolders =
          ((LazyReactPackage) reactPackage).getNativeModuleIterator(mReactApplicationContext);
    } else if (reactPackage instanceof BaseReactPackage) {
      moduleHolders =
          ((BaseReactPackage) reactPackage).getNativeModuleIterator(mReactApplicationContext);
    } else {
      moduleHolders =
          ReactPackageHelper.getNativeModuleIterator(reactPackage, mReactApplicationContext);
    }

    for (ModuleHolder moduleHolder : moduleHolders) {
      String name = moduleHolder.getName();
      if (mModules.containsKey(name)) {
        ModuleHolder existingNativeModule = mModules.get(name);
        if (!moduleHolder.getCanOverrideExistingModule()) {
          throw new IllegalStateException(
              "Native module "
                  + name
                  + " tried to override "
                  + existingNativeModule.getClassName()
                  + ". Check the getPackages() method in MainApplication.java, it might be that"
                  + " module is being created twice. If this was your intention, set"
                  + " canOverrideExistingModule=true. This error may also be present if the package"
                  + " is present only once in getPackages() but is also automatically added later"
                  + " during build time by autolinking. Try removing the existing entry and"
                  + " rebuild.");
        }
        mModules.remove(existingNativeModule);
      }
      mModules.put(name, moduleHolder);
    }
  }

  public NativeModuleRegistry build() {
    return new NativeModuleRegistry(mReactApplicationContext, mModules);
  }
}