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/*
 * Copyright 2017-2022 original 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
 *
 * https://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.micronaut.starter.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Objects;
import java.util.Scanner;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * Utility class for ZIP operations.
 *
 * @author graemerocher
 * @since 1.0.0
 */
public class ZipUtil {

    /**
     * Are the given bytes a zip file.
     * @param bytes The bytes
     * @return True if they are
     */
    public static boolean isZip(byte[] bytes) {
        if (bytes != null) {
            try (ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(bytes))) {
                ZipEntry nextEntry = zipInputStream.getNextEntry();
                return nextEntry != null;
            } catch (IOException e) {
                return false;
            }
        }
        return false;
    }

    /**
     * Does the specified zip bytes contain the specified file.
     * @param bytes The bytes
     * @param filename The file name
     * @return True if it does
     */
    public static boolean containsFile(byte[] bytes, String filename) {
        Objects.requireNonNull(bytes, "Byte cannot be null");
        Objects.requireNonNull(filename, "File name cannot be null");

        try (ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(bytes))) {
            ZipEntry nextEntry = zipInputStream.getNextEntry();
            while (nextEntry != null) {
                String name = nextEntry.getName();
                if (name.contains("/")) {
                    if (name.endsWith("/" + filename)) {
                        return true;
                    }
                } else if (name.equals(filename)) {
                    return true;
                }
                nextEntry = zipInputStream.getNextEntry();
            }
            return false;
        } catch (IOException e) {
            return false;
        }
    }

    /**
     * Does the specified zip bytes contain the specified file.
     * @param bytes The bytes
     * @param filename The file name
     * @param contents Contents
     * @return
     * True if it does
     */
    public static boolean containsFileWithContents(byte[] bytes, String filename, String contents) {
        Objects.requireNonNull(bytes, "Byte cannot be null");
        Objects.requireNonNull(filename, "File name cannot be null");
        Objects.requireNonNull(contents, "Contents cannot be null");

        try (ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(bytes))) {
            ZipEntry nextEntry = zipInputStream.getNextEntry();
            while (nextEntry != null) {
                String name = nextEntry.getName();
                if (name.contains("/")) {
                    if (name.endsWith("/" + filename)) {
                        String zipContents = readZipContents(zipInputStream);
                        System.out.println("zipContents: " + zipContents);
                        return zipContents.contains(contents);
                    }
                } else if (name.equals(filename)) {
                    String zipContents = readZipContents(zipInputStream);
                    return zipContents.contains(contents);
                }
                nextEntry = zipInputStream.getNextEntry();
            }
            return false;
        } catch (IOException e) {
            return false;
        }
    }

    private static String readZipContents(ZipInputStream zipInputStream) {
        Scanner sc = new Scanner(zipInputStream);
        StringBuilder builder = new StringBuilder();
        while (sc.hasNextLine()) {
            builder.append(sc.nextLine());
        }
        return builder.toString();
    }

}