// Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.retrace;

import com.android.tools.r8.DiagnosticsHandler;
import com.android.tools.r8.Keep;
import com.android.tools.r8.retrace.internal.StackTraceRegularExpressionParser;
import com.android.tools.r8.utils.Box;
import java.util.List;
import java.util.function.Consumer;

@Keep
public class RetraceCommand {

  private final StackTraceSupplier stacktraceSupplier;
  private final Consumer<List<String>> retracedStackTraceConsumer;
  // Not inheriting to allow for static builder methods.
  private final RetraceOptions options;

  private RetraceCommand(
      StackTraceSupplier stackTraceSupplier,
      Consumer<List<String>> retracedStackTraceConsumer,
      RetraceOptions options) {
    this.stacktraceSupplier = stackTraceSupplier;
    this.retracedStackTraceConsumer = retracedStackTraceConsumer;
    this.options = options;

    assert this.stacktraceSupplier != null || options.isVerifyMappingFileHash();
    assert this.retracedStackTraceConsumer != null;
  }

  public boolean printTimes() {
    return System.getProperty("com.android.tools.r8.printtimes") != null;
  }

  public boolean printMemory() {
    return System.getProperty("com.android.tools.r8.printmemory") != null;
  }

  public StackTraceSupplier getStacktraceSupplier() {
    return stacktraceSupplier;
  }

  public Consumer<List<String>> getRetracedStackTraceConsumer() {
    return retracedStackTraceConsumer;
  }

  public RetraceOptions getOptions() {
    return options;
  }

  /**
   * Utility method for obtaining a RetraceCommand builder.
   *
   * @param diagnosticsHandler The diagnostics handler for consuming messages.
   */
  public static Builder builder(DiagnosticsHandler diagnosticsHandler) {
    return new Builder(diagnosticsHandler);
  }

  /** Utility method for obtaining a RetraceCommand builder with a default diagnostics handler. */
  public static Builder builder() {
    return new Builder(new DiagnosticsHandler() {});
  }

  @Keep
  public static class Builder {

    private boolean isVerbose;
    private final DiagnosticsHandler diagnosticsHandler;
    private MappingSupplier<?> mappingSupplier;
    private String regularExpression = StackTraceRegularExpressionParser.DEFAULT_REGULAR_EXPRESSION;
    private StackTraceSupplier stackTrace;
    private Consumer<List<String>> retracedStackTraceConsumer;
    private boolean verifyMappingFileHash = false;

    private Builder(DiagnosticsHandler diagnosticsHandler) {
      this.diagnosticsHandler = diagnosticsHandler;
    }

    /** Set if the produced stack trace should have additional information. */
    public Builder setVerbose(boolean verbose) {
      this.isVerbose = verbose;
      return this;
    }

    /** Set a mapping supplier for providing mapping contents. */
    public Builder setMappingSupplier(MappingSupplier<?> mappingSupplier) {
      this.mappingSupplier = mappingSupplier;
      return this;
    }

    /**
     * Set a regular expression for parsing the incoming text. The Regular expression must not use
     * naming groups and has special wild cards according to proguard retrace. Note, this will
     * override the default regular expression.
     *
     * @param regularExpression The regular expression to use.
     */
    public Builder setRegularExpression(String regularExpression) {
      this.regularExpression = regularExpression;
      return this;
    }

    /**
     * Set the obfuscated stack trace that is to be retraced.
     *
     * @param stackTrace Stack trace having the top entry(the closest stack to the error) as the
     *     first line.
     */
    public Builder setStackTrace(List<String> stackTrace) {
      Box<List<String>> box = new Box<>(stackTrace);
      return setStackTrace(() -> box.getAndSet(null));
    }

    /**
     * Set a supplier of the obfuscated stack trace that is to be retraced.
     *
     * @param stackTrace Supplier where the first query should provide the top-most entry(the
     *     closest stack to the error). Use null to specify no more lines.
     */
    public Builder setStackTrace(StackTraceSupplier stackTrace) {
      this.stackTrace = stackTrace;
      return this;
    }

    /** Set if the mapping-file hash should be checked if present. */
    public Builder setVerifyMappingFileHash(boolean verifyMappingFileHash) {
      this.verifyMappingFileHash = verifyMappingFileHash;
      return this;
    }

    /**
     * Set a consumer for receiving the retraced stack trace.
     *
     * @param consumer Consumer for receiving the retraced stack trace.
     */
    public Builder setRetracedStackTraceConsumer(Consumer<List<String>> consumer) {
      this.retracedStackTraceConsumer = consumer;
      return this;
    }

    public RetraceCommand build() {
      if (this.diagnosticsHandler == null) {
        throw new RuntimeException("DiagnosticsHandler not specified");
      }
      if (this.mappingSupplier == null) {
        throw new RuntimeException("ProguardMapSupplier not specified");
      }
      if (this.stackTrace == null && !verifyMappingFileHash) {
        throw new RuntimeException("StackTrace not specified");
      }
      if (this.retracedStackTraceConsumer == null) {
        throw new RuntimeException("RetracedStackConsumer not specified");
      }
      RetraceOptions retraceOptions =
          RetraceOptions.builder(diagnosticsHandler)
              .setRegularExpression(regularExpression)
              .setMappingSupplier(mappingSupplier)
              .setVerbose(isVerbose)
              .setVerifyMappingFileHash(verifyMappingFileHash)
              .build();
      return new RetraceCommand(stackTrace, retracedStackTraceConsumer, retraceOptions);
    }

  }
}