package org.jetbrains.plugins.terminal;

import com.intellij.icons.AllIcons;
import com.intellij.notification.EventLog;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.actionSystem.*;
import com.intellij.openapi.project.DumbAwareAction;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.SimpleToolWindowPanel;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.wm.ToolWindow;
import com.intellij.openapi.wm.ToolWindowManager;
import com.intellij.openapi.wm.ex.ToolWindowManagerEx;
import com.intellij.openapi.wm.ex.ToolWindowManagerListener;
import com.intellij.ui.awt.RelativePoint;
import com.intellij.ui.awt.RelativeRectangle;
import com.intellij.ui.content.Content;
import com.intellij.ui.content.ContentFactory;
import com.intellij.ui.docking.DockContainer;
import com.intellij.ui.docking.DockManager;
import com.intellij.ui.docking.DockableContent;
import com.intellij.util.ui.UIUtil;
import com.jediterm.terminal.ui.JediTermWidget;
import com.jediterm.terminal.ui.TabbedTerminalWidget;
import com.jediterm.terminal.ui.TerminalWidget;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.terminal.vfs.TerminalSessionVirtualFileImpl;

import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

/**
 * @author traff
 */
public class TerminalView {

  private JBTabbedTerminalWidget myTerminalWidget;

  private final Project myProject;

  private TerminalDockContainer myDockContainer;

  public TerminalView(Project project) {
    myProject = project;
  }

  public static TerminalView getInstance(@NotNull Project project) {
    return project.getComponent(TerminalView.class);
  }


  public void initTerminal(final ToolWindow toolWindow) {
    LocalTerminalDirectRunner terminalRunner = OpenLocalTerminalAction.createTerminalRunner(myProject);

    toolWindow.setToHideOnEmptyContent(true);

    if (terminalRunner != null) {
      Content content = createTerminalInContentPanel(terminalRunner, toolWindow);

      toolWindow.getContentManager().addContent(content);

      ((ToolWindowManagerEx)ToolWindowManager.getInstance(myProject)).addToolWindowManagerListener(new ToolWindowManagerListener() {
        @Override
        public void toolWindowRegistered(@NotNull String id) {
        }

        @Override
        public void stateChanged() {
          ToolWindow window = ToolWindowManager.getInstance(myProject).getToolWindow(TerminalToolWindowFactory.TOOL_WINDOW_ID);
          if (window != null) {
            boolean visible = window.isVisible();
            if (visible && toolWindow.getContentManager().getContentCount() == 0) {
              initTerminal(window);
            }
          }
        }
      });

      Disposer.register(myProject, new Disposable() {
        @Override
        public void dispose() {
          if (myTerminalWidget != null) {
            myTerminalWidget.dispose();
            myTerminalWidget = null;
          }
        }
      });
    }

    if (myDockContainer == null) {
      myDockContainer = new TerminalDockContainer(toolWindow);

      Disposer.register(myProject, myDockContainer);
      DockManager.getInstance(myProject).register(myDockContainer);
    }
  }

  private Content createTerminalInContentPanel(@Nullable LocalTerminalDirectRunner terminalRunner,
                                               final @NotNull ToolWindow toolWindow) {
    SimpleToolWindowPanel panel = new SimpleToolWindowPanel(false, true) {
      @Override
      public Object getData(@NonNls String dataId) {
        return PlatformDataKeys.HELP_ID.is(dataId) ? EventLog.HELP_ID : super.getData(dataId);
      }
    };

    final Content content = ContentFactory.SERVICE.getInstance().createContent(panel, "", false);
    content.setCloseable(true);

    myTerminalWidget = terminalRunner.createTerminalWidget(content);
    myTerminalWidget.addTabListener(new TabbedTerminalWidget.TabListener() {
      @Override
      public void tabClosed(JediTermWidget terminal) {
        UIUtil.invokeLaterIfNeeded(new Runnable() {
          @Override
          public void run() {
            if (myTerminalWidget != null) {
              hideIfNoActiveSessions(toolWindow, myTerminalWidget);
            }
          }
        });
      }
    });

    panel.setContent(myTerminalWidget.getComponent());
    panel.addFocusListener(createFocusListener());

    ActionToolbar toolbar = createToolbar(terminalRunner, myTerminalWidget, toolWindow);
    toolbar.getComponent().addFocusListener(createFocusListener());
    toolbar.setTargetComponent(panel);
    panel.setToolbar(toolbar.getComponent());


    content.setPreferredFocusableComponent(myTerminalWidget.getComponent());

    return content;
  }

  private FocusListener createFocusListener() {
    return new FocusListener() {
      @Override
      public void focusGained(FocusEvent e) {
        JComponent component = getComponentToFocus();
        if (component != null) {
          component.requestFocusInWindow();
        }
      }

      @Override
      public void focusLost(FocusEvent e) {

      }
    };
  }

  private JComponent getComponentToFocus() {
    return myTerminalWidget != null ? myTerminalWidget.getComponent() : null;
  }

  public void openLocalSession(Project project, ToolWindow terminal) {
    LocalTerminalDirectRunner terminalRunner = OpenLocalTerminalAction.createTerminalRunner(project);
    openSession(terminal, terminalRunner);
  }

  private void openSession(@NotNull ToolWindow toolWindow, @NotNull AbstractTerminalRunner terminalRunner) {
    if (myTerminalWidget == null) {
      toolWindow.getContentManager().removeAllContents(true);
      final Content content = createTerminalInContentPanel(null, toolWindow);
      toolWindow.getContentManager().addContent(content);
    }
    else {
      terminalRunner.openSession(myTerminalWidget);
    }

    toolWindow.activate(new Runnable() {
      @Override
      public void run() {

      }
    }, true);
  }

  private ActionToolbar createToolbar(@Nullable final LocalTerminalDirectRunner terminalRunner,
                                      @NotNull final JBTabbedTerminalWidget terminal, @NotNull ToolWindow toolWindow) {
    DefaultActionGroup group = new DefaultActionGroup();

    if (terminalRunner != null) {
      group.add(new NewSession(terminalRunner, terminal));
      group.add(new CloseSession(terminal, toolWindow));
    }

    return ActionManager.getInstance().createActionToolbar(ActionPlaces.UNKNOWN, group, false);
  }

  public void createNewSession(Project project, final AbstractTerminalRunner terminalRunner) {
    final ToolWindow toolWindow = ToolWindowManager.getInstance(project).getToolWindow("Terminal");

    toolWindow.activate(new Runnable() {
      @Override
      public void run() {
        openSession(toolWindow, terminalRunner);
      }
    }, true);
  }

  private static void hideIfNoActiveSessions(@NotNull final ToolWindow toolWindow, @NotNull JBTabbedTerminalWidget terminal) {
    if (terminal.isNoActiveSessions()) {
      toolWindow.getContentManager().removeAllContents(true);
    }
  }


  private static class NewSession extends DumbAwareAction {
    private final LocalTerminalDirectRunner myTerminalRunner;
    private final TerminalWidget myTerminal;

    public NewSession(@NotNull LocalTerminalDirectRunner terminalRunner, @NotNull TerminalWidget terminal) {
      super("New Session", "Create New Terminal Session", AllIcons.General.Add);
      myTerminalRunner = terminalRunner;
      myTerminal = terminal;
    }

    @Override
    public void actionPerformed(AnActionEvent e) {
      myTerminalRunner.openSession(myTerminal);
    }
  }

  private class CloseSession extends DumbAwareAction {
    private final JBTabbedTerminalWidget myTerminal;
    private ToolWindow myToolWindow;

    public CloseSession(@NotNull JBTabbedTerminalWidget terminal, @NotNull ToolWindow toolWindow) {
      super("Close Session", "Close Terminal Session", AllIcons.Actions.Delete);
      myTerminal = terminal;
      myToolWindow = toolWindow;
    }

    @Override
    public void actionPerformed(AnActionEvent e) {
      myTerminal.closeCurrentSession();

      hideIfNoActiveSessions(myToolWindow, myTerminal);
    }
  }

  /**
   * @author traff
   */
  public class TerminalDockContainer implements DockContainer {
    private ToolWindow myTerminalToolWindow;

    public TerminalDockContainer(ToolWindow toolWindow) {
      myTerminalToolWindow = toolWindow;
    }

    @Override
    public RelativeRectangle getAcceptArea() {
      return new RelativeRectangle(myTerminalToolWindow.getComponent());
    }

    @Override
    public RelativeRectangle getAcceptAreaFallback() {
      return getAcceptArea();
    }

    @NotNull
    @Override
    public ContentResponse getContentResponse(@NotNull DockableContent content, RelativePoint point) {
      return isTerminalSessionContent(content) ? ContentResponse.ACCEPT_MOVE : ContentResponse.DENY;
    }

    @Override
    public JComponent getContainerComponent() {
      return myTerminalToolWindow.getComponent();
    }

    @Override
    public void add(@NotNull DockableContent content, RelativePoint dropTarget) {
      if (isTerminalSessionContent(content)) {
        TerminalSessionVirtualFileImpl terminalFile = (TerminalSessionVirtualFileImpl)content.getKey();
        myTerminalWidget.addTab(terminalFile.getName(), terminalFile.getTerminal());
        terminalFile.getTerminal().setNextProvider(myTerminalWidget);
      }
    }

    private boolean isTerminalSessionContent(DockableContent content) {
      return content.getKey() instanceof TerminalSessionVirtualFileImpl;
    }

    @Override
    public void closeAll() {

    }

    @Override
    public void addListener(Listener listener, Disposable parent) {

    }

    @Override
    public boolean isEmpty() {
      return false;
    }

    @Nullable
    @Override
    public Image startDropOver(@NotNull DockableContent content, RelativePoint point) {
      return null;
    }

    @Nullable
    @Override
    public Image processDropOver(@NotNull DockableContent content, RelativePoint point) {
      return null;
    }

    @Override
    public void resetDropOver(@NotNull DockableContent content) {

    }

    @Override
    public boolean isDisposeWhenEmpty() {
      return false;
    }

    @Override
    public void showNotify() {

    }

    @Override
    public void hideNotify() {

    }

    @Override
    public void dispose() {

    }
  }
}