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/*
 * sbt
 * Copyright 2011 - 2018, Lightbend, Inc.
 * Copyright 2008 - 2010, Mark Harrah
 * Licensed under Apache License 2.0 (see LICENSE)
 */

package sbt;

import sbt.testing.*;

/**
 * Adapts the old {@link org.scalatools.testing.Framework} interface into the new {@link
 * sbt.testing.Framework}
 */
final class FrameworkWrapper implements Framework {

  private final org.scalatools.testing.Framework oldFramework;

  FrameworkWrapper(final org.scalatools.testing.Framework oldFramework) {
    this.oldFramework = oldFramework;
  }

  public String name() {
    return oldFramework.name();
  }

  public Fingerprint[] fingerprints() {
    final org.scalatools.testing.Fingerprint[] oldFingerprints = oldFramework.tests();
    final int length = oldFingerprints.length;
    final Fingerprint[] fingerprints = new Fingerprint[length];
    for (int i = 0; i < length; i++) {
      final org.scalatools.testing.Fingerprint oldFingerprint = oldFingerprints[i];
      if (oldFingerprint instanceof org.scalatools.testing.TestFingerprint)
        fingerprints[i] =
            new SubclassFingerprintWrapper((org.scalatools.testing.TestFingerprint) oldFingerprint);
      else if (oldFingerprint instanceof org.scalatools.testing.SubclassFingerprint)
        fingerprints[i] =
            new SubclassFingerprintWrapper(
                (org.scalatools.testing.SubclassFingerprint) oldFingerprint);
      else
        fingerprints[i] =
            new AnnotatedFingerprintWrapper(
                (org.scalatools.testing.AnnotatedFingerprint) oldFingerprint);
    }
    return fingerprints;
  }

  public Runner runner(
      final String[] args, final String[] remoteArgs, final ClassLoader testClassLoader) {
    return new RunnerWrapper(oldFramework, testClassLoader, args);
  }
}

final class SubclassFingerprintWrapper implements SubclassFingerprint {
  private final String superclassName;
  private final boolean isModule;
  private final boolean requireNoArgConstructor;

  SubclassFingerprintWrapper(final org.scalatools.testing.SubclassFingerprint oldFingerprint) {
    superclassName = oldFingerprint.superClassName();
    isModule = oldFingerprint.isModule();
    requireNoArgConstructor =
        false; // Old framework SubclassFingerprint does not require no arg constructor
  }

  public boolean isModule() {
    return isModule;
  }

  public String superclassName() {
    return superclassName;
  }

  public boolean requireNoArgConstructor() {
    return requireNoArgConstructor;
  }
}

final class AnnotatedFingerprintWrapper implements AnnotatedFingerprint {
  private final String annotationName;
  private final boolean isModule;

  AnnotatedFingerprintWrapper(final org.scalatools.testing.AnnotatedFingerprint oldFingerprint) {
    annotationName = oldFingerprint.annotationName();
    isModule = oldFingerprint.isModule();
  }

  public boolean isModule() {
    return isModule;
  }

  public String annotationName() {
    return annotationName;
  }
}

final class EventHandlerWrapper implements org.scalatools.testing.EventHandler {

  private final EventHandler newEventHandler;
  private final String fullyQualifiedName;
  private final Fingerprint fingerprint;

  EventHandlerWrapper(
      final EventHandler newEventHandler,
      final String fullyQualifiedName,
      final Fingerprint fingerprint) {
    this.newEventHandler = newEventHandler;
    this.fullyQualifiedName = fullyQualifiedName;
    this.fingerprint = fingerprint;
  }

  public void handle(final org.scalatools.testing.Event oldEvent) {
    newEventHandler.handle(new EventWrapper(oldEvent, fullyQualifiedName, fingerprint));
  }
}

final class EventWrapper implements Event {

  private final org.scalatools.testing.Event oldEvent;
  private final String className;
  private final Fingerprint fingerprint;
  private final OptionalThrowable throwable;

  EventWrapper(
      final org.scalatools.testing.Event oldEvent,
      final String className,
      final Fingerprint fingerprint) {
    this.oldEvent = oldEvent;
    this.className = className;
    this.fingerprint = fingerprint;
    final Throwable oldThrowable = oldEvent.error();
    if (oldThrowable == null) throwable = new OptionalThrowable();
    else throwable = new OptionalThrowable(oldThrowable);
  }

  public String fullyQualifiedName() {
    return className;
  }

  public Fingerprint fingerprint() {
    return fingerprint;
  }

  public Selector selector() {
    return new TestSelector(oldEvent.testName());
  }

  public Status status() {
    switch (oldEvent.result()) {
      case Success:
        return Status.Success;
      case Error:
        return Status.Error;
      case Failure:
        return Status.Failure;
      case Skipped:
        return Status.Skipped;
      default:
        throw new IllegalStateException("Invalid status.");
    }
  }

  public OptionalThrowable throwable() {
    return throwable;
  }

  public long duration() {
    return -1; // Just return -1 as old event does not have duration.
  }
}

final class RunnerWrapper implements Runner {

  private final org.scalatools.testing.Framework oldFramework;
  private final ClassLoader testClassLoader;
  private final String[] args;

  RunnerWrapper(
      final org.scalatools.testing.Framework oldFramework,
      final ClassLoader testClassLoader,
      final String[] args) {
    this.oldFramework = oldFramework;
    this.testClassLoader = testClassLoader;
    this.args = args;
  }

  public Task[] tasks(final TaskDef[] taskDefs) {
    final int length = taskDefs.length;
    final Task[] tasks = new Task[length];
    for (int i = 0; i < length; i++) {
      final TaskDef taskDef = taskDefs[i];
      tasks[i] = createTask(taskDef);
    }
    return tasks;
  }

  private Task createTask(final TaskDef taskDef) {
    return new Task() {
      public String[] tags() {
        return new String[0]; // Old framework does not support tags
      }

      private org.scalatools.testing.Logger createOldLogger(final Logger logger) {
        return new org.scalatools.testing.Logger() {
          public boolean ansiCodesSupported() {
            return logger.ansiCodesSupported();
          }

          public void error(final String msg) {
            logger.error(msg);
          }

          public void warn(final String msg) {
            logger.warn(msg);
          }

          public void info(final String msg) {
            logger.info(msg);
          }

          public void debug(final String msg) {
            logger.debug(msg);
          }

          public void trace(final Throwable t) {
            logger.trace(t);
          }
        };
      }

      private void runRunner(
          final org.scalatools.testing.Runner runner,
          final Fingerprint fingerprint,
          final EventHandler eventHandler) {
        // Old runner only support subclass fingerprint.
        final SubclassFingerprint subclassFingerprint = (SubclassFingerprint) fingerprint;
        final org.scalatools.testing.TestFingerprint oldFingerprint =
            new org.scalatools.testing.TestFingerprint() {
              public boolean isModule() {
                return subclassFingerprint.isModule();
              }

              public String superClassName() {
                return subclassFingerprint.superclassName();
              }
            };
        final String name = taskDef.fullyQualifiedName();
        runner.run(
            name,
            oldFingerprint,
            new EventHandlerWrapper(eventHandler, name, subclassFingerprint),
            args);
      }

      private void runRunner2(
          final org.scalatools.testing.Runner2 runner,
          final Fingerprint fingerprint,
          final EventHandler eventHandler) {
        final org.scalatools.testing.Fingerprint oldFingerprint;
        if (fingerprint instanceof SubclassFingerprint) {
          final SubclassFingerprint subclassFingerprint = (SubclassFingerprint) fingerprint;
          oldFingerprint =
              new org.scalatools.testing.SubclassFingerprint() {
                public boolean isModule() {
                  return subclassFingerprint.isModule();
                }

                public String superClassName() {
                  return subclassFingerprint.superclassName();
                }
              };
        } else {
          final AnnotatedFingerprint annotatedFingerprint = (AnnotatedFingerprint) fingerprint;
          oldFingerprint =
              new org.scalatools.testing.AnnotatedFingerprint() {
                public boolean isModule() {
                  return annotatedFingerprint.isModule();
                }

                public String annotationName() {
                  return annotatedFingerprint.annotationName();
                }
              };
        }
        final String name = taskDef.fullyQualifiedName();
        runner.run(
            name, oldFingerprint, new EventHandlerWrapper(eventHandler, name, fingerprint), args);
      }

      public Task[] execute(final EventHandler eventHandler, final Logger[] loggers) {
        final int length = loggers.length;
        final org.scalatools.testing.Logger[] oldLoggers =
            new org.scalatools.testing.Logger[length];
        for (int i = 0; i < length; i++) {
          oldLoggers[i] = createOldLogger(loggers[i]);
        }

        final org.scalatools.testing.Runner runner =
            oldFramework.testRunner(testClassLoader, oldLoggers);
        final Fingerprint fingerprint = taskDef.fingerprint();
        if (runner instanceof org.scalatools.testing.Runner2) {
          runRunner2((org.scalatools.testing.Runner2) runner, fingerprint, eventHandler);
        } else {
          runRunner(runner, fingerprint, eventHandler);
        }
        return new Task[0];
      }

      public TaskDef taskDef() {
        return taskDef;
      }
    };
  }

  public String done() {
    return "";
  }

  public String[] args() {
    return args;
  }

  public String[] remoteArgs() {
    return new String[0]; // Old framework does not support remoteArgs
  }
}