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/*
 * Copyright The OpenZipkin Authors
 * SPDX-License-Identifier: Apache-2.0
 */
package zipkin2.storage.mysql.v1;

import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.concurrent.Executor;
import java.util.function.Function;
import javax.sql.DataSource;
import org.jooq.DSLContext;
import zipkin2.Call;
import zipkin2.Callback;

/** Uncancelable call built with an executor */
final class DataSourceCall extends Call.Base {

  static final class Factory {
    final DataSource datasource;
    final DSLContexts context;
    final Executor executor;

    Factory(DataSource datasource, DSLContexts context, Executor executor) {
      this.datasource = datasource;
      this.context = context;
      this.executor = executor;
    }

     DataSourceCall create(Function queryFunction) {
      return new DataSourceCall<>(this, queryFunction);
    }
  }

  final Factory factory;
  final Function queryFunction;

  DataSourceCall(Factory factory, Function queryFunction) {
    this.factory = factory;
    this.queryFunction = queryFunction;
  }

  @Override
  protected final V doExecute() throws IOException {
    try (Connection conn = factory.datasource.getConnection()) {
      DSLContext context = factory.context.get(conn);
      return queryFunction.apply(context);
    } catch (SQLException e) {
      throw new IOException(e);
    }
  }

  @Override
  protected void doEnqueue(Callback callback) {
    class CallbackRunnable implements Runnable {
      @Override
      public void run() {
        try {
          callback.onSuccess(doExecute());
        } catch (IOException e) {
          // unwrap the exception
          if (e.getCause() instanceof SQLException) {
            callback.onError(e.getCause());
          } else {
            callback.onError(e);
          }
        } catch (Throwable t) {
          propagateIfFatal(t);
          callback.onError(t);
        }
      }
    }
    factory.executor.execute(new CallbackRunnable());
  }

  @Override
  public String toString() {
    return queryFunction.toString();
  }

  @Override
  public Call clone() {
    return new DataSourceCall<>(factory, queryFunction);
  }
}