// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.runtime;

import com.google.devtools.build.lib.runtime.ExperimentalStateTracker.ProgressMode;
import com.google.devtools.common.options.EnumConverter;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionDocumentationCategory;
import com.google.devtools.common.options.OptionEffectTag;
import com.google.devtools.common.options.OptionMetadataTag;
import com.google.devtools.common.options.OptionsBase;

/**
 * BlazeCommandEventHandler: an event handler established for the duration of a single Blaze
 * command.
 */
public class BlazeCommandEventHandler {

  public enum UseColor { YES, NO, AUTO }
  public enum UseCurses { YES, NO, AUTO }

  public static class UseColorConverter extends EnumConverter<UseColor> {
    public UseColorConverter() {
      super(UseColor.class, "--color setting");
    }
  }

  public static class UseCursesConverter extends EnumConverter<UseCurses> {
    public UseCursesConverter() {
      super(UseCurses.class, "--curses setting");
    }
  }

  /** Progress mode converter. */
  public static class ProgressModeConverter extends EnumConverter<ProgressMode> {
    public ProgressModeConverter() {
      super(ProgressMode.class, "--experimental_ui_mode setting");
    }
  }

  public static class Options extends OptionsBase {

    @Option(
      name = "show_progress",
      defaultValue = "true",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Display progress messages during a build."
    )
    public boolean showProgress;

    @Option(
      name = "show_task_finish",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Display progress messages when tasks complete, not just when they start."
    )
    public boolean showTaskFinish;

    @Option(
      name = "show_progress_rate_limit",
      defaultValue = "0.2", // A nice middle ground; snappy but not too spammy in logs.
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Minimum number of seconds between progress messages in the output."
    )
    public double showProgressRateLimit;

    @Option(
      name = "color",
      defaultValue = "auto",
      converter = UseColorConverter.class,
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Use terminal controls to colorize output going to stderr."
    )
    public UseColor useColorEnum;

    @Option(
      name = "curses",
      defaultValue = "auto",
      converter = UseCursesConverter.class,
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Use terminal cursor controls to minimize scrolling output going to stderr."
    )
    public UseCurses useCursesEnum;

    @Option(
      name = "terminal_columns",
      defaultValue = "80",
      metadataTags = {OptionMetadataTag.HIDDEN},
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "A system-generated parameter which specifies the terminal width in columns."
    )
    public int terminalColumns;

    @Option(
      name = "is_stderr_atty",
      // TODO(b/63386499): Old name should be removed after 2019-02-28.
      oldName = "isatty",
      defaultValue = "false",
      metadataTags = {OptionMetadataTag.HIDDEN},
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "A system-generated parameter which is used to notify the server whether this client is"
              + " running in a terminal.  If this is set to false, then '--color=auto' will be"
              + " treated as '--color=no'.  If this is set to true, then '--color=auto' will be"
              + " treated as '--color=yes'.  As we only treat the stderr as a terminal, we only"
              + " care if that file descriptor is connected to a TTY."
    )
    public boolean isStderrATty;

    // This lives here (as opposed to the more logical BuildRequest.Options)
    // because the client passes it to the server *always*.  We don't want the
    // client to have to figure out when it should or shouldn't to send it.
    @Option(
      name = "emacs",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help =
          "A system-generated parameter which is true iff EMACS=t or INSIDE_EMACS is set "
              + "in the environment of the client.  This option controls certain display "
              + "features."
    )
    public boolean runningInEmacs;

    @Option(
      name = "show_timestamps",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Include timestamps in messages"
    )
    public boolean showTimestamp;

    @Option(
        name = "progress_in_terminal_title",
        defaultValue = "false",
        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
        effectTags = {OptionEffectTag.UNKNOWN},
        help =
            "Show the command progress in the terminal title. "
                + "Useful to see what bazel is doing when having multiple terminal tabs.")
    public boolean progressInTermTitle;

    @Option(
      name = "experimental_external_repositories",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Use external repositories for improved stability and speed when available."
    )
    public boolean externalRepositories;

    @Option(
      name = "force_experimental_external_repositories",
      defaultValue = "false",
      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
      effectTags = {OptionEffectTag.UNKNOWN},
      help = "Forces --experimental_external_repositories."
    )
    public boolean forceExternalRepositories;

    @Option(
        name = "attempt_to_print_relative_paths",
        oldName = "experimental_ui_attempt_to_print_relative_paths",
        defaultValue = "false",
        documentationCategory = OptionDocumentationCategory.LOGGING,
        effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
        help =
            "When printing the location part of messages, attempt to use a path relative to the "
                + "workspace directory or one of the directories specified by --package_path.")
    public boolean attemptToPrintRelativePaths;

    @Deprecated
    @Option(
        name = "ui",
        oldName = "experimental_ui",
        defaultValue = "true",
        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
        effectTags = {OptionEffectTag.UNKNOWN},
        help =
            "Switches to a progress bar that more explicitly shows progress, such "
                + "as loaded packages and executed actions.")
    public boolean experimentalUi;

    @Option(
        name = "experimental_ui_debug_all_events",
        defaultValue = "false",
        metadataTags = {OptionMetadataTag.HIDDEN},
        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
        effectTags = {OptionEffectTag.UNKNOWN},
        help = "Report all events known to the Bazel UI.")
    public boolean experimentalUiDebugAllEvents;

    @Option(
        name = "experimental_ui_mode",
        defaultValue = "oldest_actions",
        converter = ProgressModeConverter.class,
        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
        effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
        help =
            "Determines what kind of data is shown in the detailed progress bar. By default, it is "
                + "set to show the oldest actions and their running time. The underlying data "
                + "source is usually sampled in a mode-dependend way to fit within the number of "
                + "lines given by --ui_actions_shown.")
    public ProgressMode uiProgressMode;

    @Option(
        name = "ui_actions_shown",
        oldName = "experimental_ui_actions_shown",
        defaultValue = "8",
        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
        effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
        help =
            "Number of concurrent actions shown in the detailed progress bar; each "
                + "action is shown on a separate line. The progress bar always shows "
                + "at least one one, all numbers less than 1 are mapped to 1. "
                + "This option has no effect if --noui is set.")
    public int uiSamplesShown;

    @Option(
        name = "experimental_ui_limit_console_output",
        defaultValue = "0",
        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
        effectTags = {OptionEffectTag.UNKNOWN},
        help =
            "Number of bytes to which the UI will limit its output (non-positive "
                + "values indicate unlimited). Once the limit is approaching, the UI "
                + "will try hard to limit in a meaningful way, but will ultimately just drop all "
                + "output.")
    public int experimentalUiLimitConsoleOutput;

    @Option(
        name = "experimental_ui_deduplicate",
        defaultValue = "false",
        documentationCategory = OptionDocumentationCategory.LOGGING,
        effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
        help = "Make the UI deduplicate messages to have a cleaner scroll-back log.")
    public boolean experimentalUiDeduplicate;

    public boolean useColor() {
      return useColorEnum == UseColor.YES || (useColorEnum == UseColor.AUTO && isStderrATty);
    }

    public boolean useCursorControl() {
      return useCursesEnum == UseCurses.YES || (useCursesEnum == UseCurses.AUTO && isStderrATty);
    }
  }
}