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package processing.mode.java;

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

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

import java.awt.EventQueue;

import java.awt.event.InputEvent;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseWheelEvent;

import java.util.function.Predicate;

import javax.swing.JMenuItem;

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

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

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

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

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

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

import processing.app.Language;

import processing.app.Messages;

import processing.app.Platform;

class InspectMode {

final JavaEditor editor;

final PreprocService pps;

final ShowUsage usage;

boolean inspectModeEnabled;

boolean isMouse1Down;

boolean isMouse2Down;

boolean isHotkeyDown;

Predicate<MouseEvent> mouseEventHotkeyTest = Platform.isMacOS() ?

InputEvent::isMetaDown : InputEvent::isControlDown;

Predicate<KeyEvent> keyEventHotkeyTest = Platform.isMacOS() ?

e -> e.getKeyCode() == KeyEvent.VK_META :

e -> e.getKeyCode() == KeyEvent.VK_CONTROL;

InspectMode(JavaEditor editor, PreprocService pps, ShowUsage usage) {

this.editor = editor;

this.pps = pps;

this.usage = usage;

// Add listeners

JMenuItem showUsageItem = new JMenuItem(Language.text("editor.popup.jump_to_declaration"));

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

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

editor.getJavaTextArea().getPainter().addMouseListener(new MouseAdapter() {

@Override

public void mousePressed(MouseEvent e) {

isMouse1Down = isMouse1Down || (e.getButton() == MouseEvent.BUTTON1);

isMouse2Down = isMouse2Down || (e.getButton() == MouseEvent.BUTTON2);

}

@Override

public void mouseReleased(MouseEvent e) {

boolean releasingMouse1 = e.getButton() == MouseEvent.BUTTON1;

boolean releasingMouse2 = e.getButton() == MouseEvent.BUTTON2;

if (JavaMode.inspectModeHotkeyEnabled && inspectModeEnabled &&

isMouse1Down && releasingMouse1) {

handleInspect(e);

} else if (!inspectModeEnabled && isMouse2Down && releasingMouse2) {

handleInspect(e);

}

isMouse1Down = isMouse1Down && !releasingMouse1;

isMouse2Down = isMouse2Down && !releasingMouse2;

}

});

editor.getJavaTextArea().getPainter().addMouseMotionListener(new MouseAdapter() {

@Override

public void mouseDragged(MouseEvent e) {

if (editor.isSelectionActive()) {

// Mouse was dragged too much, disable

inspectModeEnabled = false;

// Cancel possible mouse 2 press

isMouse2Down = false;

}

@Override

public void mouseMoved(MouseEvent e) {

isMouse1Down = false;

isMouse2Down = false;

isHotkeyDown = mouseEventHotkeyTest.test(e);

inspectModeEnabled = isHotkeyDown;

}

});

editor.getJavaTextArea().addMouseWheelListener(new MouseAdapter() {

@Override

public void mouseWheelMoved(MouseWheelEvent e) {

// Editor was scrolled while mouse 1 was pressed, disable

if (isMouse1Down) inspectModeEnabled = false;

}

});

editor.getJavaTextArea().addKeyListener(new KeyAdapter() {

@Override

public void keyPressed(KeyEvent e) {

isHotkeyDown = isHotkeyDown || keyEventHotkeyTest.test(e);

// Enable if hotkey was just pressed and mouse 1 is not down

inspectModeEnabled = inspectModeEnabled || (!isMouse1Down && isHotkeyDown);

}

@Override

public void keyReleased(KeyEvent e) {

isHotkeyDown = isHotkeyDown && !keyEventHotkeyTest.test(e);

// Disable if hotkey was just released

inspectModeEnabled = inspectModeEnabled && isHotkeyDown;

}

});

}

void handleInspect() {

int off = editor.getSelectionStart();

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

pps.whenDoneBlocking(ps -> handleInspect(ps, tabIndex, off));

}

// Thread: EDT

void handleInspect(MouseEvent evt) {

int off = editor.getJavaTextArea().xyToOffset(evt.getX(), evt.getY());

if (off < 0) return;

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

pps.whenDoneBlocking(ps -> handleInspect(ps, tabIndex, off));

}

// Thread: worker

private void handleInspect(PreprocSketch ps, int tabIndex, int offset) {

ASTNode root = ps.compilationUnit;

int javaOffset = ps.tabOffsetToJavaOffset(tabIndex, offset);

SimpleName simpleName = getSimpleNameAt(root, javaOffset, javaOffset);

if (simpleName == null) {

Messages.log("no simple name found at click location");

return;

}

IBinding binding = resolveBinding(simpleName);

if (binding == null) {

Messages.log("binding not resolved");

return;

}

String key = binding.getKey();

ASTNode decl = ps.compilationUnit.findDeclaringNode(key);

if (decl == null) {

Messages.log("decl not found, showing usage instead");

usage.findUsageAndUpdateTree(ps, binding);

return;

}

SimpleName declName = null;

switch (binding.getKind()) {

case IBinding.TYPE: declName = ((TypeDeclaration) decl).getName(); break;

case IBinding.METHOD: declName = ((MethodDeclaration) decl).getName(); break;

case IBinding.VARIABLE: declName = ((VariableDeclaration) decl).getName(); break;

}

if (declName == null) {

Messages.log("decl name not found " + decl);

return;

}

if (declName.equals(simpleName)) {

usage.findUsageAndUpdateTree(ps, binding);

} else {

Messages.log("found declaration, offset " + decl.getStartPosition() + ", name: " + declName);

SketchInterval si = ps.mapJavaToSketch(declName);

if (!ps.inRange(si)) return;

EventQueue.invokeLater(() -> {

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

});

}

void dispose() {

// Nothing to do

}