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/*
 * Copyright 2008 The Closure Compiler 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 com.google.javascript.jscomp;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.javascript.jscomp.NodeUtil.estimateNumLines;
import static com.google.javascript.jscomp.base.JSCompStrings.lines;
import static java.lang.Math.max;
import static java.util.Comparator.comparingLong;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultiset;
import com.google.javascript.jscomp.CompilerOptions.TracerMode;
import com.google.javascript.jscomp.base.format.SimpleFormat;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;

/**
 * A PerformanceTracker collects statistics about the runtime of each pass, and
 * how much a pass impacts the size of the compiled output, before and after
 * gzip.
 */
public final class PerformanceTracker {
  private static final int DEFAULT_WHEN_SIZE_UNTRACKED = -1;

  private final Node externsRoot;

  private final TracerMode mode;

  // Keeps track of AST changes and computes code size estimation
  // if there is any.
  private final RecentChange codeChange = new RecentChange();

  private Node jsRoot;

  private int initAstSize = DEFAULT_WHEN_SIZE_UNTRACKED;
  private int initCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
  private int initGzCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;

  private final long startTime;
  private long endTime;
  private int passesRuntime = 0;
  private int maxMem = 0;
  private int runs = 0;
  private int changes = 0;
  private int loopRuns = 0;
  private int loopChanges = 0;

  private int jsLines = 0;
  private int jsSources = 0;
  private int externLines = 0;
  private int externSources = 0;

  // The following fields for tracking size changes are just estimates.
  // They do not take into account preserved license blocks, newline padding,
  // or pretty printing (if enabled), since they don't use CodePrinter.
  // To get exact sizes, call compiler.toSource() for the final generated code.
  private int astSize = DEFAULT_WHEN_SIZE_UNTRACKED;
  private int codeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
  private int gzCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
  private int astDiff = 0;
  private int diff = 0;
  private int gzDiff = 0;

  private final Deque currentPass = new ArrayDeque<>();

  /** Cumulative stats for each compiler pass. */
  private ImmutableMap passSummary;

  private ImmutableMultiset astManifest;

  /** Stats a single run of a compiler pass. */
  private final List log = new ArrayList<>();

  PerformanceTracker(Node externsRoot, Node jsRoot, TracerMode mode) {
    checkArgument(mode != TracerMode.OFF, "PerformanceTracker can't work without tracer data.");
    this.startTime = System.currentTimeMillis();
    this.externsRoot = externsRoot;
    this.jsRoot = jsRoot;
    this.mode = mode;
  }

  CodeChangeHandler getCodeChangeHandler() {
    return this.codeChange;
  }

  void recordPassStart(String passName, boolean isOneTime) {
    this.currentPass.push(new Stats(passName, isOneTime));
    // In Compiler, toSource may be called after every pass X. We don't want it
    // to reset the handler, because recordPassStop for pass X has not been
    // called, so we are falsely logging that pass X didn't make changes.
    if (!passName.equals("toSource")) {
      this.codeChange.reset();
    }
  }

  /** Updates the saved jsRoot and resets the size tracking fields accordingly. */
  void updateAfterDeserialize(Node jsRoot) {
    // TODO(bradfordcsmith): Restore line counts for inputs and externs.
    this.jsRoot = jsRoot;
    if (!tracksAstSize()) {
      return;
    }
    this.initAstSize = this.astSize = NodeUtil.countAstSize(this.jsRoot);
    if (!tracksSize()) {
      return;
    }
    PerformanceTrackerCodeSizeEstimator estimator =
        PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
    this.initCodeSize = this.codeSize = estimator.getCodeSize();
    if (tracksGzSize()) {
      this.initGzCodeSize = this.gzCodeSize = estimator.getZippedCodeSize();
    }
  }

  /**
   * Collects information about a pass P after P finishes running, eg, how much
   * time P took and what was its impact on code size.
   *
   * @param passName short name of the pass
   * @param runtime execution time in milliseconds
   */
  void recordPassStop(String passName, long runtime) {
    int allocMem = getAllocatedMegabytes();
    Stats logStats = this.currentPass.pop();
    checkState(passName.equals(logStats.pass));
    this.log.add(logStats);

    // Update fields that aren't related to code size
    logStats.runtime = runtime;
    logStats.allocMem = allocMem;
    logStats.runs = 1;
    if (this.codeChange.hasCodeChanged()) {
      logStats.changes = 1;
    }
    if (passName.equals(PassNames.PARSE_INPUTS)) {
      recordParsingStop(logStats);
    } else if (this.codeChange.hasCodeChanged() && tracksAstSize()) {
      recordOtherPassStop(logStats);
    }
  }

  private void recordParsingStop(Stats logStats) {
    if (tracksAstManifest()) {
      populateAstManifest();
    }
    recordInputCount();
    if (!tracksAstSize()) {
      return;
    }
    logStats.astSize = this.initAstSize = this.astSize = NodeUtil.countAstSize(jsRoot);
    if (!tracksSize()) {
      return;
    }
    PerformanceTrackerCodeSizeEstimator estimator =
        PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
    logStats.size = this.initCodeSize = this.codeSize = estimator.getCodeSize();
    if (tracksGzSize()) {
      logStats.gzSize = this.initGzCodeSize = this.gzCodeSize = estimator.getZippedCodeSize();
    }
  }

  private void recordOtherPassStop(Stats logStats) {
    int newSize = NodeUtil.countAstSize(this.jsRoot);
    logStats.astDiff = this.astSize - newSize;
    this.astSize = logStats.astSize = newSize;
    if (!tracksSize()) {
      return;
    }
    PerformanceTrackerCodeSizeEstimator estimator =
        PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
    newSize = estimator.getCodeSize();
    logStats.diff = this.codeSize - newSize;
    this.codeSize = logStats.size = newSize;
    if (tracksGzSize()) {
      newSize = estimator.getZippedCodeSize();
      logStats.gzDiff = this.gzCodeSize - newSize;
      this.gzCodeSize = logStats.gzSize = newSize;
    }
  }

  private void recordInputCount() {
    for (Node n = this.externsRoot.getFirstChild(); n != null; n = n.getNext()) {
      this.externSources += 1;
      this.externLines += estimateNumLines(n);
    }

    for (Node n = this.jsRoot.getFirstChild(); n != null; n = n.getNext()) {
      this.jsSources += 1;
      this.jsLines += estimateNumLines(n);
    }
  }

  private int bytesToMB(long bytes) {
    return (int) (bytes / (1024 * 1024));
  }

  private int getAllocatedMegabytes() {
    return bytesToMB(Platform.totalMemory() - Platform.freeMemory());
  }

  public boolean tracksSize() {
    return this.mode == TracerMode.RAW_SIZE || this.mode == TracerMode.ALL;
  }

  public boolean tracksGzSize() {
    return this.mode == TracerMode.ALL;
  }

  public boolean tracksAstSize() {
    return this.mode != TracerMode.TIMING_ONLY;
  }

  public boolean tracksAstManifest() {
    return this.mode.isOn();
  }

  public int getRuntime() {
    calcTotalStats();
    return this.passesRuntime;
  }

  public int getSize() {
    calcTotalStats();
    return this.codeSize;
  }

  public int getGzSize() {
    calcTotalStats();
    return this.gzCodeSize;
  }

  public int getAstSize() {
    calcTotalStats();
    return this.astSize;
  }

  @VisibleForTesting
  int getChanges() {
    calcTotalStats();
    return this.changes;
  }

  @VisibleForTesting
  int getLoopChanges() {
    calcTotalStats();
    return this.loopChanges;
  }

  @VisibleForTesting
  int getRuns() {
    calcTotalStats();
    return this.runs;
  }

  @VisibleForTesting
  int getLoopRuns() {
    calcTotalStats();
    return this.loopRuns;
  }

  public ImmutableMap getStats() {
    calcTotalStats();
    return this.passSummary;
  }

  private void calcTotalStats() {
    // This method only does work the first time it is called
    if (this.passSummary != null) {
      return;
    }
    this.endTime = System.currentTimeMillis();

    populatePassSummary();

    for (Entry entry : this.passSummary.entrySet()) {
      Stats stats = entry.getValue();
      this.passesRuntime = (int) (this.passesRuntime + stats.runtime);
      this.maxMem = max(this.maxMem, stats.allocMem);
      this.runs += stats.runs;
      this.changes += stats.changes;
      if (!stats.isOneTime) {
        this.loopRuns += stats.runs;
        this.loopChanges += stats.changes;
      }
      this.astDiff += stats.astDiff;
      this.diff += stats.diff;
      this.gzDiff += stats.gzDiff;
    }
    checkState(!tracksAstSize() || this.initAstSize == this.astDiff + this.astSize);
    checkState(!tracksSize() || this.initCodeSize == this.diff + this.codeSize);
    checkState(!tracksGzSize() || this.initGzCodeSize == this.gzDiff + this.gzCodeSize);
  }

  private void populatePassSummary() {
    HashMap tmpPassSummary = new HashMap<>();

    for (Stats logStat : this.log) {
      String passName = logStat.pass;
      Stats entry =
          tmpPassSummary.computeIfAbsent(passName, (String k) -> new Stats(k, logStat.isOneTime));
      entry.runtime += logStat.runtime;
      entry.allocMem = max(entry.allocMem, logStat.allocMem);
      entry.runs++;
      entry.changes += logStat.changes;
      entry.astDiff += logStat.astDiff;
      entry.diff += logStat.diff;
      entry.gzDiff += logStat.gzDiff;
      // We don't populate the size fields in the passSummary stats.
      // We used to put the size after the last time a pass was run, but that is
      // a pretty meaningless thing to measure.
    }

    this.passSummary = ImmutableMap.copyOf(tmpPassSummary);
  }

  private void populateAstManifest() {
    if (this.astManifest != null) {
      return;
    }

    ImmutableMultiset.Builder builder = ImmutableMultiset.builder();
    NodeUtil.visitPreOrder(this.jsRoot, (n) -> builder.add(n.getToken()));
    this.astManifest = builder.build();
  }

  /**
   * Prints a summary, which contains aggregate stats for all runs of each pass and a log, which
   * contains stats for each individual run.
   */
  public void outputTracerReport(PrintStream output) {
    JvmMetrics.maybeWriteJvmMetrics(output, "verbose:pretty:all");
    calcTotalStats();

    output.println(
        lines(
            "",
            "TOTAL:",
            "Start time(ms): " + this.startTime,
            "End time(ms): " + this.endTime,
            "Wall time(ms): " + (this.endTime - this.startTime),
            "Passes runtime(ms): " + this.passesRuntime,
            "Max mem usage (measured after each pass)(MB): " + this.maxMem,
            "#Runs: " + this.runs,
            "#Changing runs: " + this.changes,
            "#Loopable runs: " + this.loopRuns,
            "#Changing loopable runs: " + this.loopChanges,
            "Estimated AST reduction(#nodes): " + this.astDiff,
            "Estimated Reduction(bytes): " + this.diff,
            "Estimated GzReduction(bytes): " + this.gzDiff,
            "Estimated AST size(#nodes): " + this.astSize,
            "Estimated Size(bytes): " + this.codeSize,
            "Estimated GzSize(bytes): " + this.gzCodeSize));

    output.println(
        lines(
            "",
            "Inputs:",
            "JS lines:   " + this.jsLines,
            "JS sources: " + this.jsSources,
            "Extern lines:   " + this.externLines,
            "Extern sources: " + this.externSources));

    output.println(
        lines(
            "",
            "Summary:",
            "pass,runtime,allocMem,runs,changingRuns,astReduction,reduction,gzReduction"));
    this.passSummary.entrySet().stream()
        .sorted(comparingLong((e) -> e.getValue().runtime))
        .map(
            (entry) -> {
              String key = entry.getKey();
              Stats stats = entry.getValue();
              return SimpleFormat.format(
                  "%s,%d,%d,%d,%d,%d,%d,%d",
                  key,
                  stats.runtime,
                  stats.allocMem,
                  stats.runs,
                  stats.changes,
                  stats.astDiff,
                  stats.diff,
                  stats.gzDiff);
            })
        .forEach(output::println);

    output.println(
        lines(
            "",
            "Log:",
            "pass,runtime,allocMem,codeChanged,astReduction,reduction,gzReduction,astSize,size,gzSize"));
    for (Stats stats : this.log) {
      output.print(
          SimpleFormat.format(
              "%s,%d,%d,%b,%d,%d,%d,%d,%d,%d\n",
              stats.pass,
              stats.runtime,
              stats.allocMem,
              stats.changes == 1,
              stats.astDiff,
              stats.diff,
              stats.gzDiff,
              stats.astSize,
              stats.size,
              stats.gzSize));
    }

    if (this.astManifest != null) {
      output.println(
          lines(
              "", //
              "Input AST Manifest:",
              "token,count"));
      this.astManifest.entrySet().stream()
          .map((e) -> SimpleFormat.format("%s,%d", e.getElement(), e.getCount()))
          .sorted()
          .forEach(output::println);
    }

    output.println();

    // this.output can be System.out, so don't close it to not lose subsequent
    // error messages. Flush to ensure that you will see the tracer report.
    try {
      // TODO(johnlenz): Remove this cast and try/catch.
      // This is here to workaround GWT http://b/30943295
      ((FilterOutputStream) output).flush();
    } catch (IOException e) {
      throw new RuntimeException("Unreachable.", e);
    }
  }

  /**
   * A Stats object contains statistics about a pass run, such as running time,
   * size changes, etc
   */
  public static class Stats {
    Stats(String pass, boolean iot) {
      this.pass = pass;
      this.isOneTime = iot;
    }
    public final String pass;
    public final boolean isOneTime;
    public long runtime = 0;
    public int allocMem = 0;
    public int runs = 0;
    public int changes = 0;
    public int diff = 0;
    public int gzDiff = 0;
    public int size = 0;
    public int gzSize = 0;
    public int astDiff = 0;
    public int astSize = 0;
  }
}