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/*
 * Copyright 2020 webtau maintainers
 * Copyright 2019 TWO SIGMA OPEN SOURCE, LLC
 *
 * 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 org.testingisdocumenting.webtau.cli;

import org.testingisdocumenting.webtau.cli.expectation.CliResultExpectations;
import org.testingisdocumenting.webtau.expectation.ActualPath;

import java.io.IOException;
import java.util.*;
import java.util.stream.Collectors;

public class CliOutput implements CliResultExpectations {
    private final String id;
    private final StreamGobbler streamGobbler;

    private final Set matchedLinesIdx;

    private int lastClearNextLineIdxMarker;

    public CliOutput(String id, StreamGobbler streamGobbler) {
        this.id = id;
        this.streamGobbler = streamGobbler;

        this.matchedLinesIdx = new TreeSet<>();
    }

    @Override
    public ActualPath actualPath() {
        return new ActualPath(id);
    }

    public String get() {
        return streamGobbler.joinLinesStartingAt(lastClearNextLineIdxMarker);
    }

    public List copyLines() {
        return copyLinesStartingAtIdx(lastClearNextLineIdxMarker);
    }

    public List copyLinesStartingAtIdx(int idx) {
        return new ArrayList<>(streamGobbler.getLinesStartingAt(idx));
    }

    public IOException getException() {
        return streamGobbler.getException();
    }

    public void registerMatchedLine(Integer idx) {
        matchedLinesIdx.add(idx);
    }

    public void clear() {
        matchedLinesIdx.clear();
        lastClearNextLineIdxMarker = streamGobbler.getLines().size();
    }

    public int getNumberOfLines() {
        return streamGobbler.getNumberOfLines();
    }

    public List extractMatchedLines() {
        List lines = streamGobbler.getLines();
        return matchedLinesIdx.stream().map(lines::get).collect(Collectors.toList());
    }

    @Override
    public String toString() {
        return streamGobbler.joinLines();
    }
}