/*
 * Copyright 2023 The Dapr Authors
 * 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 io.dapr.workflows.runtime;

import io.dapr.durabletask.TaskOrchestration;
import io.dapr.durabletask.TaskOrchestrationFactory;
import io.dapr.workflows.Workflow;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

/**
 * Wrapper for Durable Task Framework orchestration factory.
 */
class WorkflowClassWrapper<T extends Workflow> implements TaskOrchestrationFactory {
  private final Constructor<T> workflowConstructor;
  private final String name;

  public WorkflowClassWrapper(Class<T> clazz) {
    this.name = clazz.getCanonicalName();

    try {
      this.workflowConstructor = clazz.getDeclaredConstructor();
    } catch (NoSuchMethodException e) {
      throw new RuntimeException(
          String.format("No constructor found for workflow class '%s'.", this.name), e
      );
    }
  }

  @Override
  public String getName() {
    return name;
  }

  @Override
  public TaskOrchestration create() {
    return ctx -> {
      T workflow;

      try {
        workflow = this.workflowConstructor.newInstance();
      } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
        throw new RuntimeException(
            String.format("Unable to instantiate instance of workflow class '%s'", this.name), e
        );
      }

      workflow.run(new DefaultWorkflowContext(ctx, workflow.getClass()));
    };
  }
}
