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/*
 * The MIT License (MIT) Copyright (c) 2020-2023 artipie.com
 * https://github.com/artipie/artipie/blob/master/LICENSE.txt
 */
package com.artipie.http.hm;

import java.io.ByteArrayInputStream;
import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonStructure;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

/**
 * Body matcher for JSON.
 * @since 1.0
 */
public final class IsJson extends TypeSafeMatcher {

    /**
     * Json matcher.
     */
    private final Matcher matcher;

    /**
     * New JSON body matcher.
     * @param matcher JSON structure matcher
     */
    public IsJson(final Matcher matcher) {
        this.matcher = matcher;
    }

    @Override
    public void describeTo(final Description desc) {
        desc.appendText("JSON ").appendDescriptionOf(this.matcher);
    }

    @Override
    public boolean matchesSafely(final byte[] body) {
        try (JsonReader reader = Json.createReader(new ByteArrayInputStream(body))) {
            return this.matcher.matches(reader.read());
        }
    }

    @Override
    public void describeMismatchSafely(final byte[] item, final Description desc) {
        desc.appendText("was ").appendValue(new String(item));
    }
}