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/*
 * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.alluxio.shaded.client.org.legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.alluxio.shaded.client.org.licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */

package examples;

import alluxio.shaded.client.io.vertx.core.Vertx;
import alluxio.shaded.client.io.vertx.core.buffer.Buffer;
import alluxio.shaded.client.io.vertx.core.file.AsyncFile;
import alluxio.shaded.client.io.vertx.core.file.FileSystem;
import alluxio.shaded.client.io.vertx.core.file.OpenOptions;

/**
 * Created by tim on 09/01/15.
 */
public class FileSystemExamples {

  public void example1(Vertx vertx) {
    FileSystem fs = vertx.fileSystem();

    // Copy file from foo.txt to bar.txt
    fs.copy("foo.txt", "bar.txt", res -> {
      if (res.succeeded()) {
        // Copied ok!
      } else {
        // Something went wrong
      }
    });
  }

  public void example2(Vertx vertx) {
    FileSystem fs = vertx.fileSystem();

    // Copy file from foo.txt to bar.txt synchronously
    fs.copyBlocking("foo.txt", "bar.txt");
  }

  public void example3(FileSystem fileSystem) {
    OpenOptions options = new OpenOptions();
    fileSystem.open("myfile.txt", options, res -> {
      if (res.succeeded()) {
        AsyncFile file = res.result();
      } else {
        // Something went wrong!
      }
    });
  }

  public void asyncAPIExamples(Vertx vertx) {
    // Read a file
    vertx.fileSystem().readFile("target/classes/readme.txt", result -> {
      if (result.succeeded()) {
        System.out.println(result.result());
      } else {
        System.err.println("Oh oh ..." + result.cause());
      }
    });

    // Copy a file
    vertx.fileSystem().copy("target/classes/readme.txt", "target/classes/readme2.txt", result -> {
      if (result.succeeded()) {
        System.out.println("File copied");
      } else {
        System.err.println("Oh oh ..." + result.cause());
      }
    });

    // Write a file
    vertx.fileSystem().writeFile("target/classes/hello.txt", Buffer.buffer("Hello"), result -> {
      if (result.succeeded()) {
        System.out.println("File written");
      } else {
        System.err.println("Oh oh ..." + result.cause());
      }
    });

    // Check existence and delete
    vertx.fileSystem().exists("target/classes/junk.txt", result -> {
      if (result.succeeded() && result.result()) {
        vertx.fileSystem().delete("target/classes/junk.txt", r -> {
          System.out.println("File deleted");
        });
      } else {
        System.err.println("Oh oh ... - cannot delete the file: " + result.cause());
      }
    });
  }

  public void asyncFileWrite(Vertx vertx) {
    vertx.fileSystem().open("target/classes/hello.txt", new OpenOptions(), result -> {
      if (result.succeeded()) {
        AsyncFile file = result.result();
        Buffer buff = Buffer.buffer("foo");
        for (int i = 0; i < 5; i++) {
          file.write(buff, buff.length() * i, ar -> {
            if (ar.succeeded()) {
              System.out.println("Written ok!");
              // etc
            } else {
              System.err.println("Failed to write: " + ar.cause());
            }
          });
        }
      } else {
        System.err.println("Cannot open file " + result.cause());
      }
    });
  }

  public void asyncFileRead(Vertx vertx) {
    vertx.fileSystem().open("target/classes/les_miserables.txt", new OpenOptions(), result -> {
      if (result.succeeded()) {
        AsyncFile file = result.result();
        Buffer buff = Buffer.buffer(1000);
        for (int i = 0; i < 10; i++) {
          file.read(buff, i * 100, i * 100, 100, ar -> {
            if (ar.succeeded()) {
              System.out.println("Read ok!");
            } else {
              System.err.println("Failed to write: " + ar.cause());
            }
          });
        }
      } else {
        System.err.println("Cannot open file " + result.cause());
      }
    });
  }

  public void asyncFilePipe(Vertx vertx) {
    final AsyncFile output = vertx.fileSystem().openBlocking("target/classes/plagiary.txt", new OpenOptions());

    vertx.fileSystem().open("target/classes/les_miserables.txt", new OpenOptions(), result -> {
      if (result.succeeded()) {
        AsyncFile file = result.result();
        file.pipeTo(output)
          .onComplete(v -> {
            file.close();
            System.out.println("Copy done");
          });
      } else {
        System.err.println("Cannot open file " + result.cause());
      }
    });
  }
}