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/*********************************************************************************
 *                                                                               *
 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2022 aoju.org and other contributors.                      *
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 * copies of the Software, and to permit persons to whom the Software is         *
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 * all copies or substantial portions of the Software.                           *
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package org.aoju.bus.http;

import org.aoju.bus.core.lang.Http;
import org.aoju.bus.http.metric.http.Http2Connection;

import java.util.Arrays;

/**
 * 设置描述发送对等点的特征，接收对等点使用这些特征
 * 设置的作用域是{@link Http2Connection connection}
 *
 * @author Kimi Liu
 * @since Java 17+
 */
public class Settings {

    /**
     * 设置总数
     */
    public static final int COUNT = 10;
    /**
     * 标志值
     */
    private final int[] values = new int[COUNT];
    /**
     * Bitfield值标志.
     */
    private int set;

    public void clear() {
        set = 0;
        Arrays.fill(values, 0);
    }

    public Settings set(int id, int value) {
        if (id < 0 || id >= values.length) {
            return this;
        }

        int bit = 1 << id;
        set |= bit;
        values[id] = value;
        return this;
    }

    /**
     * 如果为设置{@code id}分配了一个值，则返回true
     *
     * @param id 标记
     * @return the true/false
     */
    public boolean isSet(int id) {
        int bit = 1 << id;
        return (set & bit) != 0;
    }

    /**
     * 设置{@code id}的值，如果未设置则返回0
     *
     * @param id 标记
     * @return the id
     */
    public int get(int id) {
        return values[id];
    }

    /**
     * 具有指定值的设置的大小
     *
     * @return 设置的大小
     */
    public int size() {
        return Integer.bitCount(set);
    }

    public int getHeaderTableSize() {
        int bit = 1 << Http.HEADER_TABLE_SIZE;
        return (bit & set) != 0 ? values[Http.HEADER_TABLE_SIZE] : -1;
    }

    public boolean getEnablePush(boolean defaultValue) {
        int bit = 1 << Http.ENABLE_PUSH;
        return ((bit & set) != 0 ? values[Http.ENABLE_PUSH] : defaultValue ? 1 : 0) == 1;
    }

    public int getMaxConcurrentStreams(int defaultValue) {
        int bit = 1 << Http.MAX_CONCURRENT_STREAMS;
        return (bit & set) != 0 ? values[Http.MAX_CONCURRENT_STREAMS] : defaultValue;
    }

    public int getMaxFrameSize(int defaultValue) {
        int bit = 1 << Http.MAX_FRAME_SIZE;
        return (bit & set) != 0 ? values[Http.MAX_FRAME_SIZE] : defaultValue;
    }

    public int getMaxHeaderListSize(int defaultValue) {
        int bit = 1 << Http.MAX_HEADER_LIST_SIZE;
        return (bit & set) != 0 ? values[Http.MAX_HEADER_LIST_SIZE] : defaultValue;
    }

    public int getInitialWindowSize() {
        int bit = 1 << Http.INITIAL_WINDOW_SIZE;
        return (bit & set) != 0 ? values[Http.INITIAL_WINDOW_SIZE] : Http.DEFAULT_INITIAL_WINDOW_SIZE;
    }

    /**
     * 将{@code other}写入其中。如果使用this和{@code other}
     * 填充任何设置，则将保留{@code other}中的值和标志
     *
     * @param other 设置信息
     */
    public void merge(Settings other) {
        for (int i = 0; i < COUNT; i++) {
            if (!other.isSet(i)) continue;
            set(i, other.get(i));
        }
    }

}