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/*
 * Copyright 2004-2022 the original author or authors.
 *
 * 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
 *
 *      https://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 org.grails.gsp.compiler;

import java.io.PrintWriter;
import java.io.Writer;
import java.lang.reflect.Array;

import grails.util.GrailsStringUtils;

import org.grails.gsp.GroovyPage;


/**
 * A PrintWriter used in the generation of GSP pages that allows printing to the target output
 * stream and maintains a record of the current line number during usage.
 *
 * @author Graeme Rocher
 */
public class GSPWriter extends PrintWriter {

    private int lineNumber = 1;

    private int[] lineNumbers = new int[1000];

    //private static final Pattern LINE_BREAK = Pattern.compile("\\r\\n|\\n|\\r");
    private GroovyPageParser parse;

    public GSPWriter(Writer out, GroovyPageParser parse) {
        super(out);
        this.parse = parse;
    }

    @Override
    public void write(char[] buf, int off, int len) {
        super.write(buf, off, len);
    }

    public void printlnToResponse(String s) {
        printlnToResponse(GroovyPage.OUT_STATEMENT, s);
    }

    public void printlnToResponse(String outVarName, String s) {
        if (GrailsStringUtils.isEmpty(s)) {
            return;
        }

        this.parse.flushTagBuffering();
        super.print(outVarName);
        super.print(".print(");
        super.print(s);
        super.print(")");
        println();
    }

    public void printlnToBuffer(String s, int index) {
        if (s == null) {
            s = "''";
        }
        super.print("buf" + index + " << ");
        super.print(s);
        println();
    }

    @Override
    public void println() {
        addLineNumber();
        super.println();
    }

    private void addLineNumber() {
        if (this.lineNumber >= this.lineNumbers.length) {
            this.lineNumbers = (int[]) resizeArray(this.lineNumbers, this.lineNumbers.length * 2);
        }
        else {
            this.lineNumbers[this.lineNumber - 1] = this.parse.getCurrentOutputLineNumber();
            this.lineNumber++;
        }
    }

    private Object resizeArray(Object oldArray, int newSize) {
        int oldSize = java.lang.reflect.Array.getLength(oldArray);
        Class elementType = oldArray.getClass().getComponentType();
        Object newArray = Array.newInstance(elementType, newSize);
        int preserveLength = Math.min(oldSize, newSize);
        if (preserveLength > 0) {
            System.arraycopy(oldArray, 0, newArray, 0, preserveLength);
        }
        return newArray;
    }

    public int getCurrentLineNumber() {
        return this.lineNumber;
    }

    public int[] getLineNumbers() {
        return this.lineNumbers;
    }

}