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/*
 * Copyright (c) Ramesh Babu Prudhvi.
 *
 * 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 io.github.selcukes.commons.exec;

import io.github.selcukes.commons.exception.CommandException;
import lombok.Getter;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;

/**
 * A simple thread based utility that consumes {@link InputStream} and provides
 * the stream contents as a list of strings. This utility is NOT designed
 * to be re-used. So everytime a stream is to be consumed, a new object of this
 * utility is expected to be created. Attempting to re-use an existing instance
 * of {@link StreamGuzzler} for consuming stream will trigger errors.
 */
public class StreamGuzzler implements Runnable {
    @Getter
    private final List content = new LinkedList<>();
    private InputStream stream;

    public StreamGuzzler(final InputStream stream) {
        this.stream = stream;
    }

    @Override
    public void run() {
        Objects.requireNonNull(stream, "Cannot guzzle an empty/null stream.");
        try (var reader = new BufferedReader(new InputStreamReader(stream))) {
            content.addAll(reader.lines().toList());
        } catch (IOException exception) {
            throw new CommandException(exception);
        } finally {
            stream = null;
        }
    }

}