/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.intellij.execution.console;

import com.intellij.codeInsight.lookup.Lookup;
import com.intellij.codeInsight.lookup.LookupManager;
import com.intellij.execution.process.ConsoleHistoryModel;
import com.intellij.icons.AllIcons;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.EmptyAction;
import com.intellij.openapi.command.impl.UndoManagerImpl;
import com.intellij.openapi.command.undo.DocumentReferenceManager;
import com.intellij.openapi.command.undo.UndoManager;
import com.intellij.openapi.editor.ex.DocumentEx;
import com.intellij.openapi.editor.ex.EditorEx;
import com.intellij.openapi.project.DumbAwareAction;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.Conditions;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ConsoleExecuteAction extends DumbAwareAction {
  static final String CONSOLE_EXECUTE_ACTION_ID = "Console.Execute";

  private final LanguageConsoleView myConsoleView;
  private final LanguageConsoleImpl myConsole;
  private final ConsoleExecuteActionHandler myExecuteActionHandler;
  private final Condition<LanguageConsoleImpl> myEnabledCondition;

  @SuppressWarnings("UnusedDeclaration")
  public ConsoleExecuteAction(@NotNull LanguageConsoleView console, @NotNull BaseConsoleExecuteActionHandler executeActionHandler) {
    this(console, executeActionHandler, CONSOLE_EXECUTE_ACTION_ID, Conditions.<LanguageConsoleImpl>alwaysTrue());
  }

  /**
   * Only internal usage, to keep backward compatibility
   * to remove in IDEA 14
   */
  public static ConsoleExecuteAction createAction(@NotNull final LanguageConsoleImpl languageConsole,
                                                  @NotNull ProcessBackedConsoleExecuteActionHandler consoleExecuteActionHandler) {
    final ConsoleExecuteActionHandler handler = consoleExecuteActionHandler;
    return new ConsoleExecuteAction(languageConsole, new ConsoleExecuteActionHandler(handler.myPreserveMarkup) {
      @Override
      void doExecute(@NotNull String text, @NotNull LanguageConsoleImpl console, @Nullable LanguageConsoleView consoleView) {
        handler.doExecute(text, languageConsole, null);
      }
    }, consoleExecuteActionHandler);
  }

  ConsoleExecuteAction(@NotNull LanguageConsoleImpl console, final @NotNull ConsoleExecuteActionHandler executeActionHandler, @Nullable Condition<LanguageConsoleImpl> enabledCondition) {
    this(console, null, executeActionHandler, CONSOLE_EXECUTE_ACTION_ID, enabledCondition);
  }

  public ConsoleExecuteAction(@NotNull LanguageConsoleView console,
                              @NotNull BaseConsoleExecuteActionHandler executeActionHandler,
                              @Nullable Condition<LanguageConsoleImpl> enabledCondition) {
    this(console.getConsole(), console, executeActionHandler, CONSOLE_EXECUTE_ACTION_ID, enabledCondition);
  }

  public ConsoleExecuteAction(@NotNull LanguageConsoleView console,
                              @NotNull BaseConsoleExecuteActionHandler executeActionHandler,
                              @NotNull String emptyExecuteActionId,
                              @NotNull Condition<LanguageConsoleImpl> enabledCondition) {
    this(console.getConsole(), console, executeActionHandler, emptyExecuteActionId, enabledCondition);
  }

  private ConsoleExecuteAction(@NotNull LanguageConsoleImpl console,
                               @Nullable LanguageConsoleView consoleView,
                               @NotNull ConsoleExecuteActionHandler executeActionHandler,
                               @NotNull String emptyExecuteActionId,
                               @Nullable Condition<LanguageConsoleImpl> enabledCondition) {
    super(null, null, AllIcons.Actions.Execute);

    myConsole = console;
    myConsoleView = consoleView;
    myExecuteActionHandler = executeActionHandler;
    myEnabledCondition = enabledCondition == null ? Conditions.<LanguageConsoleImpl>alwaysTrue() : enabledCondition;

    EmptyAction.setupAction(this, emptyExecuteActionId, null);
  }

  @Override
  public final void update(AnActionEvent e) {
    EditorEx editor = myConsole.getConsoleEditor();
    boolean enabled = !editor.isRendererMode() && isEnabled() &&
                      (myExecuteActionHandler.isEmptyCommandExecutionAllowed() || !StringUtil.isEmptyOrSpaces(editor.getDocument().getCharsSequence()));
    if (enabled) {
      Lookup lookup = LookupManager.getActiveLookup(editor);
      // we should check getCurrentItem() also - fast typing could produce outdated lookup, such lookup reports isCompletion() true
      enabled = lookup == null || !lookup.isCompletion() || lookup.getCurrentItem() == null;
    }

    e.getPresentation().setEnabled(enabled);
  }

  @Override
  public final void actionPerformed(AnActionEvent e) {
    myExecuteActionHandler.runExecuteAction(myConsole, myConsoleView);
  }

  public boolean isEnabled() {
    return myEnabledCondition.value(myConsole);
  }

  public void execute(@Nullable TextRange range, @NotNull String text, @Nullable EditorEx editor) {
    if (range == null) {
      myConsole.doAddPromptToHistory();
      DocumentEx document = myConsole.getHistoryViewer().getDocument();
      document.insertString(document.getTextLength(), text);
      if (!text.endsWith("\n")) {
        document.insertString(document.getTextLength(), "\n");
      }
    }
    else {
      assert editor != null;
      myConsole.addTextRangeToHistory(range, editor, myExecuteActionHandler.myPreserveMarkup);
    }
    myExecuteActionHandler.addToCommandHistoryAndExecute(myConsole, myConsoleView, text);
  }

  public static abstract class ConsoleExecuteActionHandler {
    private final ConsoleHistoryModel myCommandHistoryModel;

    private boolean myAddToHistory = true;
    final boolean myPreserveMarkup;

    public ConsoleExecuteActionHandler(boolean preserveMarkup) {
      myCommandHistoryModel = new ConsoleHistoryModel();
      myPreserveMarkup = preserveMarkup;
    }

    public ConsoleHistoryModel getConsoleHistoryModel() {
      return myCommandHistoryModel;
    }

    public boolean isEmptyCommandExecutionAllowed() {
      return true;
    }

    public final void setAddCurrentToHistory(boolean addCurrentToHistory) {
      myAddToHistory = addCurrentToHistory;
    }

    /**
     * @deprecated
     */
    protected void beforeExecution(@NotNull LanguageConsoleImpl console) {
    }

    protected void runExecuteAction(@NotNull LanguageConsoleImpl console, @Nullable LanguageConsoleView consoleView) {
      //noinspection deprecation
      beforeExecution(console);

      String text = console.prepareExecuteAction(myAddToHistory, myPreserveMarkup, true);
      ((UndoManagerImpl)UndoManager.getInstance(console.getProject())).invalidateActionsFor(DocumentReferenceManager.getInstance().create(console.getCurrentEditor().getDocument()));
      addToCommandHistoryAndExecute(console, consoleView, text);
    }

    private void addToCommandHistoryAndExecute(@NotNull LanguageConsoleImpl console, @Nullable LanguageConsoleView consoleView, @NotNull String text) {
      myCommandHistoryModel.addToHistory(text);
      doExecute(text, console, consoleView);
    }

    abstract void doExecute(@NotNull String text, @NotNull LanguageConsoleImpl console, @Nullable LanguageConsoleView consoleView);
  }
}