/* ###
 * IP: GHIDRA
 *
 * 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 ghidra.app.plugin.core.byteviewer;

import java.awt.event.*;
import java.math.BigInteger;
import java.util.List;
import java.util.Set;

import javax.swing.*;

import docking.ActionContext;
import docking.action.*;
import docking.widgets.fieldpanel.support.ViewerPosition;
import generic.theme.GIcon;
import ghidra.app.events.*;
import ghidra.app.nav.*;
import ghidra.app.plugin.core.format.*;
import ghidra.app.services.ClipboardService;
import ghidra.app.services.ProgramManager;
import ghidra.app.util.ListingHighlightProvider;
import ghidra.framework.model.*;
import ghidra.framework.options.SaveState;
import ghidra.framework.plugintool.PluginEvent;
import ghidra.framework.plugintool.PluginTool;
import ghidra.program.model.address.Address;
import ghidra.program.model.listing.CodeUnit;
import ghidra.program.model.listing.Program;
import ghidra.program.util.*;
import ghidra.util.HelpLocation;
import ghidra.util.classfinder.ClassSearcher;
import ghidra.util.datastruct.WeakDataStructureFactory;
import ghidra.util.datastruct.WeakSet;

public class ProgramByteViewerComponentProvider extends ByteViewerComponentProvider
		implements DomainObjectListener, Navigatable {

	private ImageIcon navigatableIcon;

	protected DecoratorPanel decorationComponent;
	private WeakSet<NavigatableRemovalListener> navigationListeners =
		WeakDataStructureFactory.createCopyOnWriteWeakSet();

	private CloneByteViewerAction cloneByteViewerAction;

	protected Program program;
	protected ProgramSelection currentSelection;
	protected ProgramSelection currentHighlight;
	protected ProgramLocation currentLocation;

	private ClipboardService clipboardService;
	private ByteViewerClipboardProvider clipboardProvider;

	private final boolean isConnected;

	private boolean disposed;

	public ProgramByteViewerComponentProvider(PluginTool tool, AbstractByteViewerPlugin<?> plugin,
			boolean isConnected) {
		this(tool, plugin, "Bytes", isConnected);
	}

	protected ProgramByteViewerComponentProvider(PluginTool tool,
			AbstractByteViewerPlugin<?> plugin, String name, boolean isConnected) {
		super(tool, plugin, name, ByteViewerActionContext.class);
		this.isConnected = isConnected;
		setIcon(new GIcon("icon.plugin.byteviewer.provider"));
		if (!isConnected) {
			setTransient();
		}
		else {
			addToToolbar();
		}

		decorationComponent = new DecoratorPanel(panel, isConnected);
		clipboardProvider = new ByteViewerClipboardProvider(this, tool);
		addToTool();

		createProgramActions();
		updateTitle();
		registerNavigatable();
	}

	public void createProgramActions() {
		cloneByteViewerAction = new CloneByteViewerAction();
		tool.addLocalAction(this, cloneByteViewerAction);
	}

	@Override
	public boolean isSnapshot() {
		// we are a snapshot when we are 'disconnected' 
		return !isConnected();
	}

	@Override
	public JComponent getComponent() {
		return decorationComponent;
	}

	@Override
	public String getWindowGroup() {
		if (isConnected()) {
			return "";
		}
		return "disconnected";
	}

	@Override
	public void componentShown() {
		panel.refreshView();

		if (currentLocation != null) {
			setLocation(currentLocation);
		}
		if (currentSelection != null) {
			setSelection(currentSelection, false);
		}
	}

	@Override
	public ActionContext getActionContext(MouseEvent event) {
		return getByteViewerActionContext();
	}

	ByteViewerActionContext getByteViewerActionContext() {
		ByteBlockInfo info = panel.getCursorLocation();
		if (info == null) {
			return null;
		}
		return new ByteViewerActionContext(this);
	}

	@Override
	public void closeComponent() {
		// overridden to handle snapshots
		super.closeComponent();
		plugin.closeProvider(this);
	}

	@Override
	public void setSelection(ProgramSelection selection) {
		setSelection(selection, true);
	}

	@Override
	public ProgramSelection getSelection() {
		return currentSelection;
	}

	@Override
	public ProgramSelection getHighlight() {
		return currentHighlight;
	}

	@Override
	public String getTextSelection() {
		return getCurrentTextSelection();
	}

	private void setSelection(ProgramSelection selection, boolean notify) {
		currentSelection = selection;
		if (selection == null) {
			return;
		}

		if (!tool.isVisible(this)) {
			return;
		}

		ByteBlockSelection blockSelection = blockSet.getBlockSelection(selection);
		clipboardProvider.setSelection(currentSelection);

		panel.setViewerSelection(blockSelection);

		if (notify) {
			ProgramSelectionPluginEvent selectionEvent =
				blockSet.getPluginEvent(getName(), blockSelection);
			plugin.updateSelection(this, selectionEvent, program);
		}
		contextChanged();
	}

	@Override
	public boolean supportsHighlight() {
		return true;
	}

	@Override
	public void setHighlight(ProgramSelection newHighlight) {
		currentHighlight = newHighlight;
		if (newHighlight == null) {
			return;
		}

		if (!tool.isVisible(this)) {
			return;
		}

		ByteBlockSelection highlight = blockSet.getBlockSelection(currentHighlight);
		panel.setViewerHighlight(highlight);
		contextChanged();
		plugin.highlightChanged(this, newHighlight);

	}

	void enablePaste(boolean enabled) {
		clipboardProvider.setPasteEnabled(enabled);
	}

	protected void doSetProgram(Program newProgram) {
		setOptionsAction.setEnabled(newProgram != null);
		cloneByteViewerAction.setEnabled(newProgram != null);

		if (program != null) {
			program.removeListener(this);
		}

		program = newProgram;
		clipboardProvider.setProgram(newProgram);
		for (ByteViewerComponent byteViewerComponent : viewMap.values()) {
			DataFormatModel dataModel = byteViewerComponent.getDataModel();
			if (dataModel instanceof ProgramDataFormatModel) {
				((ProgramDataFormatModel) dataModel).setProgram(newProgram);
			}
		}

		if (newProgram != null) {
			newProgram.addListener(this);
		}
		setByteBlocks(null);
		updateTitle();
	}

	protected void updateTitle() {
		String title =
			"Bytes: " + (program == null ? "No Program" : program.getDomainFile().getName());
		if (!isConnected()) {
			title = "[" + title + "]";
		}

		setTitle(title);
	}

//==================================================================================================
// Navigatable interface methods */
//==================================================================================================

	@Override
	public ProgramLocation getLocation() {
		return currentLocation;
	}

	@Override
	public Program getProgram() {
		return program;
	}

	@Override
	public boolean goTo(Program gotoProgram, ProgramLocation location) {
		if (gotoProgram != this.program) {
			if (!isConnected()) {
				tool.setStatusInfo("Program location not applicable for this provider!");
				return false;
			}
			ProgramManager programManagerService = tool.getService(ProgramManager.class);
			if (programManagerService != null) {
				programManagerService.setCurrentProgram(gotoProgram);
			}
		}
		setLocation(location, false);
		return true;

	}

	@Override
	public LocationMemento getMemento() {
		ByteBlockInfo info = panel.getCursorLocation();
		int blockNumber = -1;
		BigInteger blockOffset = null;
		int column = 0;

		if (info != null) {
			blockNumber = getBlockNumber(info);
			blockOffset = info.getOffset();
			column = info.getColumn();
		}

		ViewerPosition vp = panel.getViewerPosition();
		return new ByteViewerLocationMemento(program, currentLocation, blockNumber, blockOffset,
			column, vp);
	}

	@Override
	public void setMemento(LocationMemento memento) {
		ByteViewerLocationMemento bvMemento = (ByteViewerLocationMemento) memento;

		int blockNumber = bvMemento.getBlockNum();
		BigInteger blockOffset = bvMemento.getBlockOffset();
		ViewerPosition vp = bvMemento.getViewerPosition();
		int column = bvMemento.getColumn();

		ByteBlock[] blocks = getByteBlocks();
		if (blocks != null && blockNumber >= 0 && blockNumber < blocks.length) {
			ByteViewerState view = new ByteViewerState(blockSet,
				new ByteBlockInfo(blocks[blockNumber], blockOffset, column), vp);
			panel.restoreView(view);
		}

	}

	@Override
	public boolean isConnected() {
		return isConnected;
	}

	@Override
	public boolean supportsMarkers() {
		return isConnected;
	}

	@Override
	public boolean isDisposed() {
		return disposed;
	}

	@Override
	public Icon getIcon() {
		if (isConnected()) {
			return super.getIcon();
		}

		if (navigatableIcon == null) {
			Icon primaryIcon = super.getIcon();
			navigatableIcon = NavigatableIconFactory.createSnapshotOverlayIcon(primaryIcon);
		}
		return navigatableIcon;
	}

	@Override
	public Icon getNavigatableIcon() {
		return getIcon();
	}

	@Override
	public boolean isVisible() {
		return tool.isVisible(this);
	}

	@Override
	public void requestFocus() {
		panel.getCurrentComponent().requestFocus();
		tool.toFront(this);
	}

//==================================================================================================
// End Navigatable interface methods */
//==================================================================================================

	private void setLocation(ProgramLocation location, boolean fireEvent) {
		currentLocation = location;
		if (location == null) {
			return;
		}

		if (!tool.isVisible(this)) {
			return;
		}

		clipboardProvider.setLocation(location);

		Address address = location.getByteAddress();
		if (!program.getMemory().contains(address)) {
			CodeUnit cu = program.getListing().getCodeUnitAfter(address);
			if (cu != null) {
				address = cu.getMinAddress();
			}
		}

		if (address == null) {
			return;
		}

		ByteBlockInfo byteBlockInfo = blockSet.getByteBlockInfo(address);
		if (byteBlockInfo == null) {
			return;
		}

		ByteBlock block = byteBlockInfo.getBlock();
		BigInteger blockOffset = byteBlockInfo.getOffset();

		int column = 0;
		if (location instanceof ByteViewerProgramLocation) {
			// the character offset only makes sense when coming from the byte viewer; other
			// location character offsets don't match the byte viewer's display
			column = location.getCharOffset();
		}

		panel.setCursorLocation(block, blockOffset, column);
		Address blockSetAddress = blockSet.getAddress(block, blockOffset);
		if (blockSetAddress == null) {
			return; // this can happen during an undo
		}

		currentLocation = getLocation(block, blockOffset, column);

		if (fireEvent && tool.isVisible(this)) {
			updateLocation(block, blockOffset, column, false);
			plugin.fireProgramLocationPluginEvent(this,
				blockSet.getPluginEvent(getName(), block, blockOffset, column));
		}
		else {
			contextChanged();
		}
	}

	ProgramLocation getLocation(ByteBlock block, BigInteger offset, int column) {
		Address address = blockSet.getAddress(block, offset);
		int characterOffset = column;
		ProgramLocation loc = new ByteViewerProgramLocation(program, address, characterOffset);
		return loc;
	}

	protected void setLocation(ProgramLocation location) {
		setLocation(location, false);
	}

	/**
	 * Called when the memory in the current program changes, from the domain object listener.
	 */
	void memoryConfigurationChanged() {
		ProgramLocation location = currentLocation;
		ProgramSelection selection = currentSelection;
		// reuse byte block change manager so we don't lose track of what has
		// been edited

		ByteBlockChangeManager bbcm = null;
		if (blockSet != null) {
			bbcm = blockSet.getByteBlockChangeManager();
		}

		setByteBlocks(bbcm);

		if (!tool.isVisible(this)) {
			return;
		}

		setLocation(location, true);
		setSelection(selection, true);
	}

	void doHandleEvent(PluginEvent event) {
		if (event instanceof ProgramActivatedPluginEvent) {
			ProgramActivatedPluginEvent ev = (ProgramActivatedPluginEvent) event;
			Program newProgram = ev.getActiveProgram();
			doSetProgram(newProgram);
			setLocation(null);
			setSelection(null, false);
			return;
		}

		ByteBlock[] blocks = getByteBlocks();
		if (blocks == null) {
			return;
		}

		if (event instanceof ByteBlockChangePluginEvent) {
			blockSet.processByteBlockChangeEvent((ByteBlockChangePluginEvent) event);
		}
		else if (event instanceof ProgramLocationPluginEvent) {
			ProgramLocationPluginEvent ev = (ProgramLocationPluginEvent) event;
			processLocationEvent(ev);
		}
		else if (event instanceof ProgramSelectionPluginEvent) {
			ProgramSelectionPluginEvent ev = (ProgramSelectionPluginEvent) event;
			processSelectionEvent(ev);
		}
		else if (event instanceof ProgramHighlightPluginEvent) {
			processHighlightEvent((ProgramHighlightPluginEvent) event);
		}
	}

	private void processHighlightEvent(ProgramHighlightPluginEvent event) {
		ProgramSelection programSelection = event.getHighlight();
		setHighlight(programSelection);
	}

	private void processSelectionEvent(ProgramSelectionPluginEvent event) {
		ProgramSelection programSelection = event.getSelection();
		setSelection(programSelection);
	}

	private void processLocationEvent(ProgramLocationPluginEvent event) {
		ProgramLocation loc = event.getLocation();
		setLocation(loc);
	}

	public void notifyEdit(ByteEditInfo edit) {
		if (tool.isVisible(this)) {
			plugin.firePluginEvent(new ByteBlockChangePluginEvent(plugin.getName(), edit, program));
		}
	}

	ProgramLocation getCurrentLocation() {
		return currentLocation;
	}

	ProgramSelection getCurrentSelection() {
		return currentSelection;
	}

	/**
	 * Gets the text of the current {@link ProgramSelection}
	 * 
	 * @return the text
	 */
	String getCurrentTextSelection() {
		return panel.getCurrentComponent().getTextForSelection();
	}

	@Override
	public void domainObjectChanged(DomainObjectChangedEvent event) {

		if (blockSet != null) {
			if (event.containsEvent(DomainObject.DO_OBJECT_SAVED) ||
				event.containsEvent(DomainObject.DO_DOMAIN_FILE_CHANGED)) {
				// drop all changes

				blockSet.setByteBlockChangeManager(newByteBlockChangeManager(blockSet, null));
				updateManager.update();
			}
		}

		if (event.containsEvent(DomainObject.DO_OBJECT_RESTORED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCK_CHANGED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCK_ADDED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCK_MOVED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCK_REMOVED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCKS_JOINED) ||
			event.containsEvent(ChangeManager.DOCR_MEMORY_BLOCK_SPLIT)) {

			// call plugin to update data models
			memoryConfigurationChanged();
			return; // memoryConfigurationChanged will recreate the
			// changeManager, so get out now.
		}

		if (event.containsEvent(ChangeManager.DOCR_MEMORY_BYTES_CHANGED) ||
			event.containsEvent(ChangeManager.DOCR_CODE_ADDED) ||
			event.containsEvent(ChangeManager.DOCR_MEM_REFERENCE_ADDED)) {
			updateManager.update();
		}
	}

	protected ByteBlockChangeManager newByteBlockChangeManager(ProgramByteBlockSet blocks,
			ByteBlockChangeManager bbcm) {
		return new ByteBlockChangeManager(blocks, bbcm);
	}

	protected ProgramByteBlockSet newByteBlockSet(ByteBlockChangeManager changeManager) {
		if (program == null) {
			return null;
		}

		return new ProgramByteBlockSet(this, program, changeManager);
	}

	protected void setByteBlocks(ByteBlockChangeManager changeManager) {
		if (blockSet != null) {
			blockSet.dispose();
		}

		blockSet = newByteBlockSet(changeManager);
		panel.setByteBlocks(blockSet);
	}

	@Override
	protected void updateSelection(ByteBlockSelection selection) {
		ProgramSelectionPluginEvent event = blockSet.getPluginEvent(plugin.getName(), selection);
		currentSelection = event.getSelection();
		plugin.updateSelection(this, event, program);
		clipboardProvider.setSelection(currentSelection);
		contextChanged();
	}

	@Override
	protected void updateLocation(ByteBlock block, BigInteger blockOffset, int column,
			boolean export) {
		ProgramLocationPluginEvent event =
			blockSet.getPluginEvent(plugin.getName(), block, blockOffset, column);
		currentLocation = event.getLocation();
		plugin.updateLocation(this, event, export);
		clipboardProvider.setLocation(currentLocation);
		contextChanged();
	}

	protected void readDataState(SaveState saveState) {
		unRegisterNavigatable();
		initializeInstanceID(saveState.getLong("NAV_ID", getInstanceID()));
		registerNavigatable();
		restoreLocation(saveState);
	}

	void restoreLocation(SaveState saveState) {
		int blockNumber = saveState.getInt(BLOCK_NUM, 0);
		BigInteger blockOffset = new BigInteger(saveState.getString(BLOCK_OFFSET, "0"));
		int column = saveState.getInt(BLOCK_COLUMN, 0);

		int index = saveState.getInt(INDEX, 0);
		int xOffset = saveState.getInt(X_OFFSET, 0);
		int yOffset = saveState.getInt(Y_OFFSET, 0);
		ViewerPosition vp = new ViewerPosition(index, xOffset, yOffset);

		ByteBlock[] blocks = getByteBlocks();
		if (blocks != null && blockNumber >= 0 && blockNumber < blocks.length) {
			ByteViewerState view = new ByteViewerState(blockSet,
				new ByteBlockInfo(blocks[blockNumber], blockOffset, column), vp);
			panel.restoreView(view);
		}
	}

	Object getUndoRedoState(DomainObject domainObject) {
		if (program != domainObject || blockSet == null) {
			return null;
		}
		return blockSet.getUndoRedoState();
	}

	void restoreUndoRedoState(DomainObject domainObject, Object state) {
		if (program != domainObject || blockSet == null) {
			return;
		}
		SaveState saveState = (SaveState) state;
		blockSet.restoreUndoRedoState(saveState);
	}

	protected void writeDataState(SaveState saveState) {
		saveState.putLong("NAV_ID", getInstanceID());
		ByteBlockInfo info = panel.getCursorLocation();
		int blockNumber = -1;
		String blockOffset = "0";
		int column = 0;

		if (info != null) {
			blockNumber = getBlockNumber(info);
			blockOffset = info.getOffset().toString();
			column = info.getColumn();
		}
		saveState.putInt(BLOCK_NUM, blockNumber);
		saveState.putString(BLOCK_OFFSET, blockOffset);
		saveState.putInt(BLOCK_COLUMN, column);

		ViewerPosition vp = panel.getViewerPosition();
		saveState.putInt(INDEX, vp.getIndexAsInt());
		saveState.putInt(X_OFFSET, vp.getXOffset());
		saveState.putInt(Y_OFFSET, vp.getYOffset());

	}

	private int getBlockNumber(ByteBlockInfo info) {
		ByteBlock[] blocks = getByteBlocks();
		ByteBlock b = info.getBlock();
		for (int i = 0; i < blocks.length; i++) {
			if (blocks[i] == b) {
				return i;
			}
		}
		return -1;
	}

	@Override
	public DataFormatModel getDataFormatModel(String formatName) {
		DataFormatModel dataFormatModel = super.getDataFormatModel(formatName);
		if (dataFormatModel instanceof ProgramDataFormatModel) {
			((ProgramDataFormatModel) dataFormatModel).setProgram(program);
		}
		return dataFormatModel;
	}

	@Override
	void setEditMode(boolean isEditable) {
		super.setEditMode(isEditable);
		enablePaste(isEditable);
	}

	@Override
	void dispose() {
		if (program != null) {
			program.removeListener(this);
		}
		program = null;
		setByteBlocks(null);
		if (clipboardService != null) {
			clipboardService.deRegisterClipboardContentProvider(clipboardProvider);
		}
		disposed = true;
		unRegisterNavigatable();
		super.dispose();
	}

	@Override
	protected Set<DataFormatModel> getDataFormatModels() {
		Set<DataFormatModel> dataFormatModels = super.getDataFormatModels();
		List<ProgramDataFormatModel> instances =
			ClassSearcher.getInstances(ProgramDataFormatModel.class);
		dataFormatModels.addAll(instances);
		return dataFormatModels;
	}

	public void cloneWindow() {
		ProgramByteViewerComponentProvider newProvider = plugin.createNewDisconnectedProvider();

		SaveState saveState = new SaveState();
		writeConfigState(saveState);
		newProvider.readConfigState(saveState);

		newProvider.doSetProgram(program);

		newProvider.setLocation(currentLocation);
		newProvider.setSelection(currentSelection, false);
		newProvider.setHighlight(currentHighlight);
		ViewerPosition viewerPosition = panel.getViewerPosition();
		newProvider.panel.setViewerPosition(viewerPosition);
	}

//==================================================================================================
// Inner Classes
//==================================================================================================

	private class CloneByteViewerAction extends DockingAction {

		public CloneByteViewerAction() {
			super("ByteViewer Clone", plugin.getName());
			Icon image = new GIcon("icon.provider.clone");
			setToolBarData(new ToolBarData(image, "ZZZ"));

			setDescription("Create a snapshot (disconnected) copy of this Bytes window ");
			setHelpLocation(new HelpLocation("Snapshots", "Snapshots_Start"));
			setKeyBindingData(new KeyBindingData(KeyEvent.VK_T,
				InputEvent.CTRL_DOWN_MASK | InputEvent.SHIFT_DOWN_MASK));
		}

		@Override
		public void actionPerformed(ActionContext context) {
			cloneWindow();
		}
	}

	@Override
	public void addNavigatableListener(NavigatableRemovalListener listener) {
		navigationListeners.add(listener);
	}

	@Override
	public void removeNavigatableListener(NavigatableRemovalListener listener) {
		navigationListeners.remove(listener);
	}

	void registerNavigatable() {
		NavigatableRegistry.registerNavigatable(tool, this);
	}

	void unRegisterNavigatable() {
		NavigatableRegistry.unregisterNavigatable(tool, this);
		for (NavigatableRemovalListener listener : navigationListeners) {
			listener.navigatableRemoved(this);
		}
	}

	void setClipboardService(ClipboardService service) {
		clipboardService = service;
		if (clipboardService != null) {
			clipboardService.registerClipboardContentProvider(clipboardProvider);
		}
	}

	@Override
	public void removeHighlightProvider(ListingHighlightProvider highlightProvider, Program p) {
		// currently unsupported
	}

	@Override
	public void setHighlightProvider(ListingHighlightProvider highlightProvider, Program p) {
		// currently unsupported

	}
}
