CustomNPC-Plus/src/main/java/noppes/npcs/client/gui/util/GuiScriptTextArea.java

package noppes.npcs.client.gui.util;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.util.ChatAllowedCharacters;
import noppes.npcs.NoppesStringUtils;
import noppes.npcs.client.ClientProxy;

import noppes.npcs.client.gui.util.script.JavaTextContainer;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;

import noppes.npcs.client.gui.util.script.JavaTextContainer.LineData;

import static net.minecraft.client.gui.GuiScreen.isCtrlKeyDown;

public class GuiScriptTextArea extends GuiNpcTextField {
    public int id;
    public int x;
    public int y;
    public int width;
    public int height;
    private int cursorCounter;
    private ITextChangeListener listener;
    public String text = null;
    private JavaTextContainer container = null;
    public boolean active = false;
    public boolean enabled = true;
    public boolean visible = true;
    public boolean clicked = false;
    public boolean doubleClicked = false;
    public boolean clickScrolling = false;
    private int startSelection;
    private int endSelection;
    private int cursorPosition;
    private int scrolledLine = 0;
    private boolean enableCodeHighlighting = false;
    public List<GuiScriptTextArea.UndoData> undoList = new ArrayList();
    public List<GuiScriptTextArea.UndoData> redoList = new ArrayList();
    public boolean undoing = false;
    private long lastClicked = 0L;
    // private static TrueTypeFont font = new TrueTypeFont(new Font("Arial Unicode MS", Font.PLAIN, ConfigClient.FontSize), 1);

    public GuiScriptTextArea(GuiScreen guiScreen, int id, int x, int y, int width, int height, String text) {
        super(id, guiScreen, x, y, width, height, null);
        this.id = id;
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.undoing = true;
        this.setText(text);
        this.undoing = false;
    }

    public void drawTextBox(int xMouse, int yMouse) {
        if (!visible)
            return;
        clampSelectionBounds();
        drawRect(x - 1, y - 1, x + width + 1, y + height + 1, 0xffa0a0a0);
        drawRect(x, y, x + width, y + height, 0xff000000);

        container.visibleLines = height / container.lineHeight;

        if (listener instanceof GuiNPCInterface) {
            int k2 = ((GuiNPCInterface) listener).mouseScroll = Mouse.getDWheel();
            if (k2 != 0) {
                this.scrolledLine -= k2 / 40;
                this.scrolledLine = Math.max(Math.min(this.scrolledLine, this.container.linesCount - this.height / this.container.lineHeight), 0);
            }
        }

        if (clicked) {
            clicked = Mouse.isButtonDown(0);
            int i = getSelectionPos(xMouse, yMouse);
            if (i != cursorPosition) {
                if (doubleClicked) {
                    startSelection = endSelection = cursorPosition;
                    doubleClicked = false;
                }
                setCursor(i, true);
            }
        } else if (doubleClicked) {
            doubleClicked = false;
        }

        if (clickScrolling) {
            clickScrolling = Mouse.isButtonDown(0);
            int diff = container.linesCount - container.visibleLines;
            scrolledLine = Math.min(Math.max((int) (1f * diff * (yMouse - y) / height), 0), diff);
        }
        int startBracket = 0, endBracket = 0;
        if (startSelection >= 0 && startSelection < text.length() &&
            (endSelection - startSelection == 1 || startSelection == endSelection)) {
            char c = text.charAt(startSelection);
            int found = 0;
            if (c == '{') {
                found = findClosingBracket(text.substring(startSelection), '{', '}');
            } else if (c == '[') {
                found = findClosingBracket(text.substring(startSelection), '[', ']');
            } else if (c == '(') {
                found = findClosingBracket(text.substring(startSelection), '(', ')');
            } else if (c == '}') {
                found = findOpeningBracket(text.substring(0, startSelection + 1), '{', '}');
            } else if (c == ']') {
                found = findOpeningBracket(text.substring(0, startSelection + 1), '[', ']');
            } else if (c == ')') {
                found = findOpeningBracket(text.substring(0, startSelection + 1), '(', ')');
            }
            if (found != 0) {
                startBracket = startSelection;
                endBracket = startSelection + found;
            }
        }

        List<JavaTextContainer.LineData> list = new ArrayList<>(container.lines);

        // Build brace spans: depth, open line, close line (inclusive)
        List<int[]> braceSpans = computeBraceSpans(text, list);

        String wordHightLight = null;
        if (startSelection != endSelection) {
            Matcher m = container.regexWord.matcher(text);
            while (m.find()) {
                if (m.start() == startSelection && m.end() == endSelection) {
                    wordHightLight = text.substring(startSelection, endSelection);
                }
            }
        }
        for (int i = 0; i < list.size(); i++) {
            LineData data = list.get(i);
            String line = data.text;
            int w = line.length();
            if (startBracket != endBracket) {
                if (startBracket >= data.start && startBracket < data.end) {
                    int s = ClientProxy.Font.width(line.substring(0, startBracket - data.start));
                    int e = ClientProxy.Font.width(line.substring(0, startBracket - data.start + 1)) + 1;
                    int posY = y + 1 + (i - scrolledLine) * container.lineHeight;
                    drawRect(x + 1 + s, posY, x + 1 + e, posY + container.lineHeight + 1, 0x9900cc00);
                }
                if (endBracket >= data.start && endBracket < data.end) {
                    int s = ClientProxy.Font.width(line.substring(0, endBracket - data.start));
                    int e = ClientProxy.Font.width(line.substring(0, endBracket - data.start + 1)) + 1;
                    int posY = y + 1 + (i - scrolledLine) * container.lineHeight;
                    drawRect(x + 1 + s, posY, x + 1 + e, posY + container.lineHeight + 1, 0x9900cc00);
                }
            }
            if (i >= scrolledLine && i < scrolledLine + container.visibleLines) {
                if (wordHightLight != null) {
                    Matcher m = container.regexWord.matcher(line);
                    while (m.find()) {
                        if (line.substring(m.start(), m.end()).equals(wordHightLight)) {
                            int s = ClientProxy.Font.width(line.substring(0, m.start()));
                            int e = ClientProxy.Font.width(line.substring(0, m.end())) + 1;
                            int posY = y + 1 + (i - scrolledLine) * container.lineHeight;
                            drawRect(x + 1 + s, posY, x + 1 + e, posY + container.lineHeight + 1, 0x99004c00);
                        }
                    }
                }
                if (startSelection != endSelection && endSelection > data.start && startSelection <= data.end) {
                    if (startSelection < data.end) {
                        int s = ClientProxy.Font.width(line.substring(0, Math.max(startSelection - data.start, 0)));
                        int e = ClientProxy.Font.width(line.substring(0, Math.min(endSelection - data.start, w))) + 1;
                        int posY = y + 1 + (i - scrolledLine) * container.lineHeight;
                        drawRect(x + 1 + s, posY, x + 1 + e, posY + container.lineHeight + 1, 0x990000ff);
                    }
                }
                int yPos = y + (i - scrolledLine) * container.lineHeight + 1;

                // Draw indent guides once per visible block based on brace spans
                if (i == scrolledLine && !braceSpans.isEmpty()) {
                    int visStart = scrolledLine;
                    int visEnd = Math.min(list.size() - 1, scrolledLine + container.visibleLines - 1);
                    for (int[] span : braceSpans) {
                        int depth = span[0];
                        int openLine = span[1];
                        int closeLine = span[2];
                        // Skip top-level (depth 1) to avoid class/global fields guides
                        if (depth <= 1)
                            continue;
                        int startLine = openLine + 1; // start under the opening brace
                        int endLine = closeLine - 1;  // stop before the closing brace
                        if (startLine > endLine)
                            continue;
                        if (endLine < visStart || startLine > visEnd)
                            continue;

                        int drawStart = Math.max(startLine, visStart);
                        int drawEnd = Math.min(endLine, visEnd);
                        // Compute horizontal position: 4 spaces per indent level, minus a tiny left offset
                        int spaces = (depth - 1) * 4;
                        StringBuilder sb = new StringBuilder();
                        for (int k = 0; k < spaces; k++)
                            sb.append(' ');
                        int px = ClientProxy.Font.width(sb.toString());
                        int gx = x + 4 + px - 2; // shift left ~2px for the IntelliJ feel

                        int topY = y + (drawStart - scrolledLine) * container.lineHeight;
                        int bottomY = y + (drawEnd - scrolledLine + 1) * container.lineHeight - 2;
                        drawRect(gx, topY, gx + 1, bottomY, 0x33FFFFFF);
                    }
                }
                data.drawString(x + 1, yPos, 0xFFe0e0e0);

                if (active && isEnabled() && (cursorCounter / 6) % 2 == 0 && (cursorPosition >= data.start && cursorPosition < data.end || (i == list.size() - 1 && cursorPosition == text.length()))) {
                    int posX = x + ClientProxy.Font.width(
                            line.substring(0, Math.min(cursorPosition - data.start, line.length())));
                    drawRect(posX + 1, yPos, posX + 2, yPos + 1 + container.lineHeight, -3092272);
                }
            }
        }

        if (hasVerticalScrollbar()) {
            Minecraft.getMinecraft().renderEngine.bindTexture(GuiCustomScroll.resource);
            int sbSize = Math.max((int) (1f * container.visibleLines / container.linesCount * height), 2);

            int posX = x + width - 6;
            int posY = (int) (y + 1f * scrolledLine / container.linesCount * (height - 4)) + 1;

            drawRect(posX, posY, posX + 5, posY + sbSize, 0xFFe0e0e0);
        }
    }

    private int findClosingBracket(String str, char s, char e) {
        int found = 0;
        char[] chars = str.toCharArray();

        for (int i = 0; i < chars.length; ++i) {
            char c = chars[i];
            if (c == s) {
                ++found;
            } else if (c == e) {
                --found;
                if (found == 0) {
                    return i;
                }
            }
        }

        return 0;
    }

    private int findOpeningBracket(String str, char s, char e) {
        int found = 0;
        char[] chars = str.toCharArray();

        for (int i = chars.length - 1; i >= 0; --i) {
            char c = chars[i];
            if (c == e) {
                ++found;
            } else if (c == s) {
                --found;
                if (found == 0) {
                    return i - chars.length + 1;
                }
            }
        }

        return 0;
    }

    // Computes brace spans as {depth, openLineIndex, closeLineIndex}, inclusive of brace lines
    private List<int[]> computeBraceSpans(String fullText, List<LineData> lines) {
        List<int[]> spans = new ArrayList<>();
        if (fullText == null || fullText.isEmpty() || lines == null || lines.isEmpty())
            return spans;

        int depth = 0;
        int lineIdx = 0;
        int lineEnd = lines.get(0).end;
        java.util.ArrayList<Integer> openStack = new java.util.ArrayList<>(); // store open line indices

        for (int pos = 0; pos < fullText.length(); pos++) {
            // advance line index
            while (lineIdx < lines.size() - 1 && pos >= lineEnd) {
                lineIdx++;
                lineEnd = lines.get(lineIdx).end;
            }

            char c = fullText.charAt(pos);
            if (c == '{') {
                openStack.add(lineIdx);
                depth++;
            } else if (c == '}') {
                if (!openStack.isEmpty()) {
                    int openLine = openStack.remove(openStack.size() - 1);
                    int spanDepth = depth; // depth before decrement
                    int closeLine = lineIdx;
                    spans.add(new int[]{spanDepth, openLine, closeLine});
                }
                depth = Math.max(0, depth - 1);
            }
        }
        return spans;
    }

    private int getSelectionPos(int xMouse, int yMouse) {
        xMouse -= this.x + 1;
        yMouse -= this.y + 1;
        ArrayList list = new ArrayList(this.container.lines);

        for (int i = 0; i < list.size(); ++i) {
            LineData data = (LineData) list.get(i);
            if (i >= this.scrolledLine && i < this.scrolledLine + this.container.visibleLines) {
                int yPos = (i - this.scrolledLine) * this.container.lineHeight;
                if (yMouse >= yPos && yMouse < yPos + this.container.lineHeight) {
                    int lineWidth = 0;
                    char[] chars = data.text.toCharArray();

                    for (int j = 1; j <= chars.length; ++j) {
                        int w = ClientProxy.Font.width(data.text.substring(0, j));
                        if (xMouse < lineWidth + (w - lineWidth) / 2) {
                            return data.start + j - 1;
                        }

                        lineWidth = w;
                    }

                    // Place cursor after the last visible character of the line.
                    // `data.end - 1` previously pointed at the newline for non-last lines
                    // which made clicks land on the newline rather than after the text.
                    // Use data.start + chars.length to return the position directly
                    // after the line's characters, clamped to the total text length.
                    int posAfterChars = data.start + chars.length;
                    return Math.min(posAfterChars, text.length());
                }
            }
        }

        return this.container.text.length();
    }

    @Override
    public boolean textboxKeyTyped(char c, int i) {
        if (!active)
            return false;

        if (this.isKeyComboCtrlA(i)) {
            startSelection = cursorPosition = 0;
            endSelection = text.length();
            return true;
        }

        if (!isEnabled())
            return false;

        LineData currentLine = null;
        for (LineData line : this.container.lines) {
            if (startSelection >= line.start && startSelection <= line.end) {
                currentLine = line;
                break;
            }
        }

        String original = text;
        if (i == Keyboard.KEY_LEFT) {
            int j = 1;
            if (isCtrlKeyDown()) {
                Matcher m = container.regexWord.matcher(text.substring(0, cursorPosition));
                while (m.find()) {
                    if (m.start() == m.end())
                        continue;
                    j = cursorPosition - m.start();
                }
            }
            int newPos = Math.max(cursorPosition - j, 0);
            setCursor(newPos, GuiScreen.isShiftKeyDown());
            return true;
        }
        if (i == Keyboard.KEY_RIGHT) {
            int j = 1;
            if (isCtrlKeyDown()) {
                Matcher m = container.regexWord.matcher(text.substring(cursorPosition));
                if (m.find() && m.start() > 0 || m.find()) {
                    j = m.start();
                }
            }
            int newPos = Math.min(cursorPosition + j, text.length()); //-2 for the \n
            setCursor(newPos, GuiScreen.isShiftKeyDown());
            return true;
        }
        if (i == Keyboard.KEY_UP) {
            setCursor(cursorUp(), GuiScreen.isShiftKeyDown());
            return true;
        }
        if (i == Keyboard.KEY_DOWN) {
            setCursor(cursorDown(), GuiScreen.isShiftKeyDown());
            return true;
        }
        if (i == Keyboard.KEY_DELETE) {
            String s = getSelectionAfterText();
            if (!s.isEmpty() && startSelection == endSelection)
                s = s.substring(1);
            setText(getSelectionBeforeText() + s);
            endSelection = cursorPosition = startSelection;
            return true;
        }
        if (isKeyComboCtrlBackspace(i)) {
            String s = getSelectionBeforeText();
            if (startSelection > 0 && startSelection == endSelection) {
                int nearestCondition = cursorPosition;
                int g;
                boolean cursorInWhitespace = Character.isWhitespace(s.charAt(cursorPosition - 1));
                if (cursorInWhitespace) {
                    // Find the nearest word if we are starting in whitespace
                    for (g = cursorPosition - 1; g >= 0; g--) {
                        char currentChar = s.charAt(g);
                        if (!Character.isWhitespace(currentChar)) {
                            nearestCondition = g;
                            break;
                        }
                        if (g == 0) {
                            nearestCondition = 0;
                        }
                    }
                } else {
                    // Find the nearest blank space or new line
                    for (g = cursorPosition - 1; g >= 0; g--) {
                        char currentChar = s.charAt(g);
                        if (Character.isWhitespace(currentChar) || currentChar == '\n') {
                            nearestCondition = g;
                            break;
                        }
                        if (g == 0) {
                            nearestCondition = 0;
                        }
                    }
                }

                // Remove all text to the left up to the nearest boundary
                s = s.substring(0, nearestCondition);
                startSelection -= (cursorPosition - nearestCondition);
            }
            setText(s + getSelectionAfterText());
            endSelection = cursorPosition = startSelection;
            return true;
        }
        if (i == Keyboard.KEY_BACK) {
            if (startSelection == endSelection && startSelection > 0) {
                // If the character before the cursor is a newline, remove that single newline.
                // This handles backspacing into empty lines (joining the previous and current lines)
                // without relying on LineData start/end calculations.
                if (startSelection - 1 >= 0 && startSelection - 1 < text.length() && text.charAt(startSelection - 1) == '\n') {
                    String before = text.substring(0, startSelection - 1);
                    String after = startSelection < text.length() ? text.substring(startSelection) : "";
                    setText(before + after);
                    endSelection = cursorPosition = startSelection = startSelection - 1;
                    return true;
                }
                // Check if we should remove an empty/whitespace-only line
                if (currentLine != null) {
                    // Check if cursor is at line start or after only whitespace
                    String beforeCursor = text.substring(currentLine.start, startSelection);
                    boolean atLineStartOrWhitespace = beforeCursor.trim().isEmpty();

                    // Check if line contains only whitespace
                    boolean lineOnlyWhitespace = currentLine.text.trim().isEmpty();

                    if (atLineStartOrWhitespace && lineOnlyWhitespace && currentLine.start > 0) {
                        // Remove the empty/whitespace-only line by deleting the substring
                        // from the start of this line up to and including the next newline (if any).
                        int removeStart = currentLine.start;
                        int removeEnd = text.indexOf('\n', removeStart);
                        if (removeEnd == -1) {
                            removeEnd = text.length();
                        } else {
                            removeEnd = removeEnd + 1; // include the newline
                        }
                        String before = text.substring(0, removeStart);
                        String after = removeEnd > text.length() ? "" : text.substring(removeEnd);
                        setText(before + after);
                        // Place cursor at end of previous line (just before where the removed newline was)
                        int newCursor = Math.max(0, removeStart - 1);
                        endSelection = cursorPosition = startSelection = newCursor;
                        return true;
                    }
                }
            }

            String s = getSelectionBeforeText();
            if (startSelection > 0 && startSelection == endSelection) {
                s = s.substring(0, s.length() - 1);
                startSelection--;
            }
            setText(s + getSelectionAfterText());
            endSelection = cursorPosition = startSelection;
            return true;
        }
        if (this.isKeyComboCtrlX(i)) {
            if (startSelection != endSelection) {
                NoppesStringUtils.setClipboardContents(text.substring(startSelection, endSelection));
                String s = getSelectionBeforeText();
                setText(s + getSelectionAfterText());
                endSelection = startSelection = cursorPosition = s.length();

            }
            return true;
        }
        if (this.isKeyComboCtrlC(i)) {
            if (startSelection != endSelection) {
                NoppesStringUtils.setClipboardContents(text.substring(startSelection, endSelection));
            }
            return true;
        }
        if (this.isKeyComboCtrlV(i)) {
            addText(NoppesStringUtils.getClipboardContents());
            return true;
        }
        if (i == Keyboard.KEY_Z && isCtrlKeyDown()) {
            if (undoList.isEmpty())
                return false;
            undoing = true;
            redoList.add(new UndoData(this.text, this.cursorPosition));
            UndoData data = undoList.remove(undoList.size() - 1);
            setText(data.text);
            endSelection = startSelection = cursorPosition = data.cursorPosition;
            undoing = false;
            return true;
        }
        if (i == Keyboard.KEY_Y && isCtrlKeyDown()) {
            if (redoList.isEmpty())
                return false;
            undoing = true;
            undoList.add(new UndoData(this.text, this.cursorPosition));
            UndoData data = redoList.remove(redoList.size() - 1);
            setText(data.text);
            endSelection = startSelection = cursorPosition = data.cursorPosition;
            undoing = false;
            return true;
        }
        if (i == Keyboard.KEY_TAB) {
            addText("    ");
        }
        if (i == Keyboard.KEY_RETURN) {
            addText(Character.toString('\n') + getIndentCurrentLine());
        }
        if (ChatAllowedCharacters.isAllowedCharacter(c)) {
            addText(Character.toString(c));
        }

        if (i == Keyboard.KEY_SLASH && isCtrlKeyDown()) {
            if (startSelection != endSelection) {
                toggleCommentSelection();
            } else {
                toggleCommentLineAtCursor();
            }
            return true;
        }

        if (i == Keyboard.KEY_D && isCtrlKeyDown()) {
            if (startSelection != endSelection) {
                // Handle multi-line selection duplication
                LineData firstLine = null, lastLine = null;
                for (LineData line : container.lines) {
                    if (line.end > startSelection && line.start < endSelection) {
                        if (firstLine == null) firstLine = line;
                        lastLine = line;
                    }
                }
                if (firstLine != null && lastLine != null) {
                    String selectedText = text.substring(firstLine.start, lastLine.end);
                    String insertText = "\n" + selectedText;
                    // Save selection before setText
                    int savedStart = startSelection;
                    int savedEnd = endSelection;
                    setText(text.substring(0, lastLine.end) + insertText + text.substring(lastLine.end));
                    // Move cursor to start of duplicated block
                    setCursor(lastLine.end + 1, false);
                    // Restore selection
                    startSelection = savedStart;
                    endSelection = savedEnd;
                    return true;
                }
            } else {
                // Single line duplication (existing logic)
                for (LineData line : container.lines) {
                    if (cursorPosition >= line.start && cursorPosition <= line.end) {
                        int lineStart = line.start, lineEnd = line.end;
                        String lineText = text.substring(lineStart, lineEnd);
                        String insertText = "\n" + lineText;
                        // Save selection before setText
                        int savedStart = startSelection;
                        int savedEnd = endSelection;
                        setText(text.substring(0, lineEnd) + insertText + text.substring(lineEnd));
                        // Move cursor to start of duplicated line
                        setCursor(lineEnd + 1, false);
                        // Restore selection
                        startSelection = savedStart;
                        endSelection = savedEnd;
                        return true;
                    }
                }
            }
        }

        return true;
    }

    private boolean isShiftKeyDown() {
        return Keyboard.isKeyDown(42) || Keyboard.isKeyDown(54);
    }

    private void toggleCommentSelection() {
        StringBuilder newText = new StringBuilder(text.length() + 100);
        int prevEnd = 0;

        int newStart = -1; //calculates expanded startSelection
        int newEnd = -1; //calculates expanded endSelection
        int newIndex = 0;

        for (LineData line : container.lines) {
            int safeLineStart = Math.max(0, Math.min(line.start, text.length()));
            int safeLineEnd = Math.max(0, Math.min(line.end, text.length()));

            if (safeLineStart > prevEnd) {
                if (newStart == -1 && startSelection >= prevEnd && startSelection <= safeLineStart) {
                    newStart = newIndex + (startSelection - prevEnd);
                }
                if (newEnd == -1 && endSelection >= prevEnd && endSelection <= safeLineStart) {
                    newEnd = newIndex + (endSelection - prevEnd);
                }
                newText.append(text, prevEnd, safeLineStart);
                newIndex += safeLineStart - prevEnd;
            }

            if (safeLineEnd > startSelection && safeLineStart < endSelection) {
                String lineText = text.substring(safeLineStart, safeLineEnd);
                CommentToggleInfo ti = toggleLine(lineText);
                String newLineText = ti.text;
                int nonWs = ti.nonWs;
                int delta = ti.delta;

                if (newStart == -1 && startSelection >= safeLineStart && startSelection <= safeLineEnd) {
                    int offsetInOldStart = startSelection - safeLineStart;
                    int newOffsetStart = offsetInOldStart;
                    if (offsetInOldStart >= nonWs) {
                        newOffsetStart = offsetInOldStart + delta;
                    }
                    newStart = newIndex + Math.max(0, newOffsetStart);
                }
                if (newEnd == -1 && endSelection >= safeLineStart && endSelection <= safeLineEnd) {
                    int offsetInOld = endSelection - safeLineStart;
                    int newOffset = offsetInOld;
                    if (offsetInOld >= nonWs) {
                        newOffset = offsetInOld + delta;
                    }
                    newEnd = newIndex + Math.max(0, newOffset);
                }

                newText.append(newLineText);
                newIndex += newLineText.length();
            } else {
                if (newStart == -1 && startSelection >= safeLineStart && startSelection <= safeLineEnd) {
                    newStart = newIndex + (startSelection - safeLineStart);
                }
                if (newEnd == -1 && endSelection >= safeLineStart && endSelection <= safeLineEnd) {
                    newEnd = newIndex + (endSelection - safeLineStart);
                }
                newText.append(text, safeLineStart, safeLineEnd);
                newIndex += safeLineEnd - safeLineStart;
            }
            prevEnd = safeLineEnd;
        }

        if (prevEnd < text.length()) {
            if (newStart == -1 && startSelection >= prevEnd && startSelection <= text.length()) {
                newStart = newIndex + (startSelection - prevEnd);
            }
            if (newEnd == -1 && endSelection >= prevEnd && endSelection <= text.length()) {
                newEnd = newIndex + (endSelection - prevEnd);
            }
            newText.append(text, prevEnd, text.length());
            newIndex += text.length() - prevEnd;
        }

        if (newStart == -1) newStart = Math.max(0, Math.min(startSelection, newText.length()));
        if (newEnd == -1) newEnd = Math.max(0, Math.min(endSelection, newText.length()));

        setText(newText.toString());
        startSelection = newStart;
        endSelection = newEnd;
        cursorPosition = endSelection;
    }

    private void toggleCommentLineAtCursor() {
        for (LineData line : container.lines) {
            int lineStart = Math.max(0, Math.min(line.start, text.length()));
            int lineEnd = Math.max(0, Math.min(line.end, text.length()));
            if (cursorPosition >= lineStart && cursorPosition <= lineEnd) {
                String lineText = text.substring(lineStart, lineEnd);
                CommentToggleInfo ti = toggleLine(lineText);
                String newLineText = ti.text;
                int nonWs = ti.nonWs;
                boolean hasComment = ti.delta < 0;
                String before = text.substring(0, lineStart);
                String after = lineEnd <= text.length() ? text.substring(lineEnd) : "";
                setText(before + newLineText + after);
                int cursorDelta = hasComment ? -2 : 2;
                int newCursor = cursorPosition + cursorDelta;
                if (cursorPosition < lineStart + nonWs + (hasComment ? 2 : 0)) newCursor = cursorPosition;
                setCursor(Math.max(lineStart, newCursor), false);
                return;
            }
        }
    }

    private boolean isAltKeyDown() {
        return Keyboard.isKeyDown(56) || Keyboard.isKeyDown(184);
    }

    private boolean isKeyComboCtrlX(int keyID) {
        return keyID == 45 && isCtrlKeyDown() && !isShiftKeyDown() && !isAltKeyDown();
    }

    private boolean isKeyComboCtrlBackspace(int keyID) {
        return keyID == Keyboard.KEY_BACK && isCtrlKeyDown() && !isShiftKeyDown() && !isAltKeyDown();
    }

    private boolean isKeyComboCtrlV(int keyID) {
        return keyID == 47 && isCtrlKeyDown() && !isShiftKeyDown() && !isAltKeyDown();
    }

    private boolean isKeyComboCtrlC(int keyID) {
        return keyID == 46 && isCtrlKeyDown() && !isShiftKeyDown() && !isAltKeyDown();
    }

    private boolean isKeyComboCtrlA(int keyID) {
        return keyID == 30 && isCtrlKeyDown() && !isShiftKeyDown() && !isAltKeyDown();
    }

    private String getIndentCurrentLine() {
        Iterator var1 = this.container.lines.iterator();

        LineData data;
        do {
            if (!var1.hasNext()) {
                return "";
            }

            data = (LineData) var1.next();
        } while (this.cursorPosition <= data.start || this.cursorPosition > data.end);

        int i;
        for (i = 0; i < data.text.length() && data.text.charAt(i) == 32; ++i) {
            ;
        }

        return data.text.substring(0, i);
    }

    private void setCursor(int i, boolean select) {
        i = Math.min(Math.max(i, 0), this.text.length());
        if (i != this.cursorPosition) {
            if (!select) {
                this.endSelection = this.startSelection = this.cursorPosition = i;
            } else {
                int diff = this.cursorPosition - i;
                if (this.cursorPosition == this.startSelection) {
                    this.startSelection -= diff;
                } else if (this.cursorPosition == this.endSelection) {
                    this.endSelection -= diff;
                }

                if (this.startSelection > this.endSelection) {
                    int j = this.endSelection;
                    this.endSelection = this.startSelection;
                    this.startSelection = j;
                }

                this.cursorPosition = i;
            }

            clampSelectionBounds();
        }
    }

    private void addText(String s) {
        this.setText(this.getSelectionBeforeText() + s + this.getSelectionAfterText());
        this.endSelection = this.startSelection = this.cursorPosition = this.startSelection + s.length();
    }

    private int cursorUp() {
        for (int i = 0; i < this.container.lines.size(); ++i) {
            LineData data = (LineData) this.container.lines.get(i);
            if (this.cursorPosition >= data.start && this.cursorPosition < data.end) {
                if (i == 0) {
                    return 0;
                }

                int var10000 = this.cursorPosition - data.start;
                return this.getSelectionPos(this.x + 1 + ClientProxy.Font.width(data.text.substring(0, this.cursorPosition - data.start)), this.y + 1 + (i - 1 - this.scrolledLine) * this.container.lineHeight);
            }
        }

        return 0;
    }

    private int cursorDown() {
        if (cursorPosition == text.length())
            return cursorPosition;
        for (int i = 0; i < this.container.lines.size(); ++i) {
            LineData data = (LineData) this.container.lines.get(i);
            if (this.cursorPosition >= data.start && this.cursorPosition < data.end) {
                int var10000 = this.cursorPosition - data.start;
                return this.getSelectionPos(this.x + 1 + ClientProxy.Font.width(data.text.substring(0, this.cursorPosition - data.start)), this.y + 1 + (i + 1 - this.scrolledLine) * this.container.lineHeight);
            }
        }

        return this.text.length();
    }

    public String getSelectionBeforeText() {
        return this.startSelection == 0 ? "" : this.text.substring(0, this.startSelection);
    }

    public String getSelectionAfterText() {
        return this.text.substring(this.endSelection);
    }

    public void mouseClicked(int xMouse, int yMouse, int mouseButton) {
        this.active = xMouse >= this.x && xMouse < this.x + this.width && yMouse >= this.y && yMouse < this.y + this.height;
        if (this.active) {
            this.startSelection = this.endSelection = this.cursorPosition = this.getSelectionPos(xMouse, yMouse);
            this.clicked = mouseButton == 0;
            this.doubleClicked = false;
            long time = System.currentTimeMillis();
            if (this.clicked && this.container.linesCount * this.container.lineHeight > this.height && xMouse > this.x + this.width - 8) {
                this.clicked = false;
                this.clickScrolling = true;
            } else if (time - this.lastClicked < 500L) {
                this.doubleClicked = true;
                Matcher m = this.container.regexWord.matcher(this.text);

                while (m.find()) {
                    if (this.cursorPosition > m.start() && this.cursorPosition < m.end()) {
                        this.startSelection = m.start();
                        this.endSelection = m.end();
                        break;
                    }
                }
            }

            this.lastClicked = time;
            activeTextfield = this;
        }
    }

    public void updateCursorCounter() {
        ++this.cursorCounter;
    }

    public void setText(String text) {
        if (text == null) {
            return;
        }

        text = text.replace("\r", "");
        text = text.replace("\t", "    ");
        if (this.text == null || !this.text.equals(text)) {
            if (this.listener != null) {
                this.listener.textUpdate(text);
            }

            if (!this.undoing) {
                this.undoList.add(new GuiScriptTextArea.UndoData(this.text, this.cursorPosition));
                this.redoList.clear();
            }

            this.text = text;
            //this.container = new TextContainer(text);
            this.container = new JavaTextContainer(text);
            this.container.init(this.width, this.height);
            if (this.enableCodeHighlighting) {
                this.container.formatCodeText();
            }

            if (this.scrolledLine > this.container.linesCount - this.container.visibleLines) {
                this.scrolledLine = Math.max(0, this.container.linesCount - this.container.visibleLines);
            }

            clampSelectionBounds();

        }
    }

    public String getText() {
        return this.text;
    }

    public boolean isEnabled() {
        return this.enabled && this.visible;
    }

    public boolean hasVerticalScrollbar() {
        return this.container.visibleLines < this.container.linesCount;
    }

    public void enableCodeHighlighting() {
        this.enableCodeHighlighting = true;
        this.container.formatCodeText();
    }

    public void setListener(ITextChangeListener listener) {
        this.listener = listener;
    }

    private void clampSelectionBounds() {
        if (this.text == null || this.text.isEmpty()) {
            this.startSelection = this.endSelection = this.cursorPosition = 0;
            return;
        }

        int length = this.text.length();
        this.startSelection = Math.max(0, Math.min(this.startSelection, length));
        this.endSelection = Math.max(0, Math.min(this.endSelection, length));
        this.cursorPosition = Math.max(0, Math.min(this.cursorPosition, length));
    }

    private static class CommentToggleInfo {
        public final String text;
        public final int delta; // newText.length() - oldText.length()
        public final int nonWs;

        public CommentToggleInfo(String text, int delta, int nonWs) {
            this.text = text;
            this.delta = delta;
            this.nonWs = nonWs;
        }
    }

    private CommentToggleInfo toggleLine(String lineText) {
        int nonWs = 0;
        while (nonWs < lineText.length() && Character.isWhitespace(lineText.charAt(nonWs))) nonWs++;
        boolean hasContent = nonWs < lineText.length();
        boolean hasComment = hasContent && lineText.startsWith("//", nonWs);
        String newLineText;
        if (hasComment) {
            int cut = Math.min(nonWs + 2, lineText.length());
            newLineText = lineText.substring(0, nonWs) + (cut <= lineText.length() ? lineText.substring(cut) : "");
        } else if (hasContent) {
            newLineText = lineText.substring(0, nonWs) + "//" + lineText.substring(nonWs);
        } else {
            newLineText = lineText;
        }
        return new CommentToggleInfo(newLineText, newLineText.length() - lineText.length(), nonWs);
    }

    class UndoData {
        public String text;
        public int cursorPosition;

        public UndoData(String text, int cursorPosition) {
            this.text = text;
            this.cursorPosition = cursorPosition;
        }
    }
}