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package processing.mode.java;

import static processing.mode.java.ASTUtils.findAllOccurrences;

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.GraphicsDevice;

import java.awt.GraphicsEnvironment;

import java.awt.Rectangle;

import java.awt.event.ComponentAdapter;

import java.awt.event.ComponentEvent;

import java.util.Comparator;

import java.util.List;

import java.util.Map;

import java.util.function.Consumer;

import java.util.stream.Collectors;

import javax.swing.JDialog;

import javax.swing.JMenuItem;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.WindowConstants;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreeModel;

import org.eclipse.jdt.core.dom.IBinding;

import org.eclipse.jdt.core.dom.IMethodBinding;

import org.eclipse.jdt.core.dom.IVariableBinding;

import org.eclipse.jdt.core.dom.SimpleName;

import processing.app.Language;

import processing.app.ui.EditorStatus;

import processing.app.ui.Toolkit;

import processing.app.ui.ZoomTreeCellRenderer;

class ShowUsage {

final JDialog window;

final JTree tree;

final JavaEditor editor;

final PreprocService pps;

final Consumer<PreprocSketch> reloadListener;

IBinding binding;

ShowUsage(JavaEditor editor, PreprocService pps) {

this.editor = editor;

this.pps = pps;

// Add show usage option

JMenuItem showUsageItem =

new JMenuItem(Language.text("editor.popup.show_usage"));

showUsageItem.addActionListener(e -> handleShowUsage());

editor.getTextArea().getRightClickPopup().add(showUsageItem);

reloadListener = this::reloadShowUsage;

{ // Show Usage window

window = new JDialog(editor);

window.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);

window.setAutoRequestFocus(false);

window.addComponentListener(new ComponentAdapter() {

@Override

public void componentHidden(ComponentEvent e) {

binding = null;

tree.setModel(null);

pps.unregisterListener(reloadListener);

}

@Override

public void componentShown(ComponentEvent e) {

pps.registerListener(reloadListener);

}

});

window.setSize(Toolkit.zoom(300, 400));

window.setFocusableWindowState(false);

Toolkit.setIcon(window);

JScrollPane sp2 = new JScrollPane();

tree = new JTree();

ZoomTreeCellRenderer renderer =

new ZoomTreeCellRenderer();

tree.setCellRenderer(renderer);

renderer.setLeafIcon(null);

renderer.setClosedIcon(null);

renderer.setOpenIcon(null);

renderer.setBackgroundSelectionColor(new Color(228, 248, 246));

renderer.setBorderSelectionColor(new Color(0, 0, 0, 0));

renderer.setTextSelectionColor(Color.BLACK);

sp2.setViewportView(tree);

window.add(sp2);

}

tree.addTreeSelectionListener(e -> {

if (tree.getLastSelectedPathComponent() != null) {

DefaultMutableTreeNode tnode =

(DefaultMutableTreeNode) tree.getLastSelectedPathComponent();

if (tnode.getUserObject() instanceof ShowUsageTreeNode) {

ShowUsageTreeNode node = (ShowUsageTreeNode) tnode.getUserObject();

editor.highlight(node.tabIndex, node.startTabOffset, node.stopTabOffset);

}

});

}

// Thread: EDT

void handleShowUsage() {

int startOffset = editor.getSelectionStart();

int stopOffset = editor.getSelectionStop();

int tabIndex = editor.getSketch().getCurrentCodeIndex();

pps.whenDoneBlocking(ps -> handleShowUsage(ps, tabIndex, startOffset, stopOffset));

}

// Thread: worker

void handleShowUsage(PreprocSketch ps, int tabIndex,

int startTabOffset, int stopTabOffset) {

// Map offsets

int startJavaOffset = ps.tabOffsetToJavaOffset(tabIndex, startTabOffset);

int stopJavaOffset = ps.tabOffsetToJavaOffset(tabIndex, stopTabOffset);

// Find the node

SimpleName name = ASTUtils.getSimpleNameAt(ps.compilationUnit, startJavaOffset, stopJavaOffset);

if (name == null) {

editor.statusMessage("Cannot find any name under cursor", EditorStatus.NOTICE);

return;

}

// Find binding

IBinding binding = ASTUtils.resolveBinding(name);

if (binding == null) {

editor.statusMessage("Cannot find usages, try to fix errors in your code first",

EditorStatus.NOTICE);

return;

}

findUsageAndUpdateTree(ps, binding);

}

// Thread: worker

void findUsageAndUpdateTree(PreprocSketch ps, IBinding binding) {

this.binding = binding;

// Get label

String bindingType = "";

switch (binding.getKind()) {

case IBinding.METHOD:

IMethodBinding method = (IMethodBinding) binding;

if (method.isConstructor()) bindingType = "Constructor";

else bindingType = "Method";

break;

case IBinding.TYPE:

bindingType = "Type";

break;

case IBinding.VARIABLE:

IVariableBinding variable = (IVariableBinding) binding;

if (variable.isField()) bindingType = "Field";

else if (variable.isParameter()) bindingType = "Parameter";

else if (variable.isEnumConstant()) bindingType = "Enum constant";

else bindingType = "Local variable";

break;

}

// Find usages, map to tree nodes, add to root node

String bindingKey = binding.getKey();

List<SketchInterval> intervals =

findAllOccurrences(ps.compilationUnit, bindingKey).stream()

.map(ps::mapJavaToSketch)

// remove occurrences which fall into generated header

.filter(ps::inRange)

// remove empty intervals (happens when occurence was inserted)

.filter(in -> in.startPdeOffset < in.stopPdeOffset)

.collect(Collectors.toList());

int usageCount = intervals.size();

// Get element name from PDE code if possible, otherwise use one from Java

String elementName = intervals.stream()

.findAny()

.map(si -> ps.pdeCode.substring(si.startPdeOffset, si.stopPdeOffset))

.orElseGet(binding::getName);

// Create root node

DefaultMutableTreeNode rootNode =

new DefaultMutableTreeNode(bindingType + ": " + elementName);

intervals.stream()

// Convert to TreeNodes

.map(in -> ShowUsageTreeNode.fromSketchInterval(ps, in))

// Group by tab index

.collect(Collectors.groupingBy(node -> node.tabIndex))

// Stream Map Entries of (tab index) <-> (List<ShowUsageTreeNode>)

.entrySet().stream()

// Sort by tab index

.sorted(Comparator.comparing(Map.Entry::getKey))

.map(entry -> {

Integer tabIndex = entry.getKey();

List<ShowUsageTreeNode> nodes = entry.getValue();

int count = nodes.size();

String usageLabel = count == 1 ? "usage" : "usages";

// Create new DefaultMutableTreeNode for this tab

String tabLabel = "<html>" +

ps.sketch.getCode(tabIndex).getPrettyName() +

" " + count + " " + usageLabel + "</html>";

DefaultMutableTreeNode tabNode = new DefaultMutableTreeNode(tabLabel);

// Stream nodes belonging to this tab

nodes.stream()

// Convert TreeNodes to DefaultMutableTreeNodes

.map(DefaultMutableTreeNode::new)

// Add all as children of tab node

.forEach(tabNode::add);

return tabNode;

})

// Add all tab nodes as children of root node

.forEach(rootNode::add);

TreeModel treeModel = new DefaultTreeModel(rootNode);

// Update tree

EventQueue.invokeLater(() -> {

tree.setModel(treeModel);

// Expand all nodes

for (int i = 0; i < tree.getRowCount(); i++) {

tree.expandRow(i);

}

tree.setRootVisible(true);

if (!window.isVisible()) {

window.setVisible(true);

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

GraphicsDevice defaultScreen = ge.getDefaultScreenDevice();

Rectangle rect = defaultScreen.getDefaultConfiguration().getBounds();

int maxX = (int) rect.getMaxX() - window.getWidth();

int x = Math.min(editor.getX() + editor.getWidth(), maxX);

int y = (x == maxX) ? 10 : editor.getY();

window.setLocation(x, y);

}

window.toFront();

window.setTitle("Usage of \"" + elementName + "\" : " +

usageCount + " time(s)");

});

}

// Thread: worker

void reloadShowUsage(PreprocSketch ps) {

if (binding != null) {

findUsageAndUpdateTree(ps, binding);

}

void hide() {

window.setVisible(false);

}

void dispose() {

if (window != null) {

window.dispose();

}

class ShowUsageTreeNode {

final int tabIndex;

final int startTabOffset;

final int stopTabOffset;

final String text;

ShowUsageTreeNode(int tabIndex, int startTabOffset, int stopTabOffset, String text) {

this.tabIndex = tabIndex;

this.startTabOffset = startTabOffset;

this.stopTabOffset = stopTabOffset;

this.text = text;

}

static ShowUsageTreeNode fromSketchInterval(PreprocSketch ps, SketchInterval in) {

int lineStartPdeOffset = ps.pdeCode.lastIndexOf('\n', in.startPdeOffset) + 1;

int lineStopPdeOffset = ps.pdeCode.indexOf('\n', in.stopPdeOffset);

if (lineStopPdeOffset == -1) lineStopPdeOffset = ps.pdeCode.length();

int highlightStartOffset = in.startPdeOffset - lineStartPdeOffset;

int highlightStopOffset = in.stopPdeOffset - lineStartPdeOffset;

int tabLine = ps.tabOffsetToTabLine(in.tabIndex, in.startTabOffset);

// TODO: what a mess

String line = ps.pdeCode.substring(lineStartPdeOffset, lineStopPdeOffset);

String pre = line.substring(0, highlightStartOffset)

.replace("&", "&").replace(">", ">").replace("<", "<");

String highlight = line.substring(highlightStartOffset, highlightStopOffset)

.replace("&", "&").replace(">", ">").replace("<", "<");

String post = line.substring(highlightStopOffset)

.replace("&", "&").replace(">", ">").replace("<", "<");

line = pre + "" + highlight + "" + post;

line = line.trim();

String text = "<html>" +

(tabLine + 1) + " " + line + "</html>";

return new ShowUsageTreeNode(in.tabIndex, in.startTabOffset, in.stopTabOffset, text);

}

@Override

public String toString() {

return text;

}