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/*
 * Copyright (C) 2013 The Guava 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
 *
 * 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 com.google.common.io;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import java.io.IOException;
import java.io.Reader;
import java.nio.CharBuffer;

/**
 * A {@link Reader} that reads the characters in a {@link CharSequence}. Like {@code StringReader},
 * but works with any {@link CharSequence}.
 *
 * @author Colin Decker
 */
// TODO(user): make this public? as a type, or a method in CharStreams?@deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
@Deprecated(since = "2022-12-01")
final class CharSequenceReader extends Reader {

    private CharSequence seq;

    private int pos;

    private int mark;

    /**
     * Creates a new reader wrapping the given character sequence.
     */
    public CharSequenceReader(CharSequence seq) {
        this.seq = checkNotNull(seq);
    }

    private void checkOpen() throws IOException {
        if (seq == null) {
            throw new IOException("reader closed");
        }
    }

    private boolean hasRemaining() {
        return remaining() > 0;
    }

    private int remaining() {
        return seq.length() - pos;
    }

    @Override
    public synchronized int read(CharBuffer target) throws IOException {
        checkNotNull(target);
        checkOpen();
        if (!hasRemaining()) {
            return -1;
        }
        int charsToRead = Math.min(target.remaining(), remaining());
        for (int i = 0; i < charsToRead; i++) {
            target.put(seq.charAt(pos++));
        }
        return charsToRead;
    }

    @Override
    public synchronized int read() throws IOException {
        checkOpen();
        return hasRemaining() ? seq.charAt(pos++) : -1;
    }

    @Override
    public synchronized int read(char[] cbuf, int off, int len) throws IOException {
        checkPositionIndexes(off, off + len, cbuf.length);
        checkOpen();
        if (!hasRemaining()) {
            return -1;
        }
        int charsToRead = Math.min(len, remaining());
        for (int i = 0; i < charsToRead; i++) {
            cbuf[off + i] = seq.charAt(pos++);
        }
        return charsToRead;
    }

    @Override
    public synchronized long skip(long n) throws IOException {
        checkArgument(n >= 0, "n (%s) may not be negative", n);
        checkOpen();
        // safe because remaining is an int
        int charsToSkip = (int) Math.min(remaining(), n);
        pos += charsToSkip;
        return charsToSkip;
    }

    @Override
    public synchronized boolean ready() throws IOException {
        checkOpen();
        return true;
    }

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

    @Override
    public synchronized void mark(int readAheadLimit) throws IOException {
        checkArgument(readAheadLimit >= 0, "readAheadLimit (%s) may not be negative", readAheadLimit);
        checkOpen();
        mark = pos;
    }

    @Override
    public synchronized void reset() throws IOException {
        checkOpen();
        pos = mark;
    }

    @Override
    public synchronized void close() throws IOException {
        seq = null;
    }
}