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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.security.certutil.console;

import org.apache.commons.lang3.tuple.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedList;
import java.util.List;

public class TestableConsole implements CommandLineConsole {

    private static final Logger LOG = LoggerFactory.getLogger(TestableConsole.class);

    private final List> providedResponses = new LinkedList<>();
    private final List output = new LinkedList<>();
    private boolean silent = false;

    public static TestableConsole empty() {
        return new TestableConsole();
    }

    public TestableConsole silent() {
        this.silent = true;
        return this;
    }

    public TestableConsole register(Prompt prompt, String response) {
        this.providedResponses.add(Pair.of(prompt, response));
        return this;
    }

    @Override
    public String readLine(Prompt prompt) {
        final String response = consumeResponse(prompt);
        return response;
    }

    @Override
    public char[] readPassword(Prompt prompt) {
        final String response = consumeResponse(prompt);
        return response.toCharArray();
    }

    @Override
    public void printLine(String line) {
        if (!silent) {
            LOG.info(line);
        }
        this.output.add(line);
    }

    public List getOutput() {
        return output;
    }

    private String consumeResponse(Prompt prompt) {
        final Pair response = providedResponses.stream().filter(r -> r.getKey().equals(prompt)).findFirst()
                .orElseThrow(() -> new ConsoleException("Unexpected input question:" + prompt.question()));
        providedResponses.remove(response);
        return response.getValue();
    }
}