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package com.zhuang.mica.mqtt.model;

import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.util.IdUtil;
import cn.hutool.core.util.StrUtil;
import lombok.Data;

@Data
public class MessageOptions {

    public static final int MAX_WAIT_SECONDS = 10 * 60;
    public static final int DEFAULT_WAIT_SECONDS = 20;

    private String topic;
    private String deviceId;
    private Integer qos = 2;
    private Boolean retain = false;
    private boolean waitReply = false;
    private Integer waitSeconds = DEFAULT_WAIT_SECONDS;
    private boolean saveLog = false;

    public Integer getWaitSeconds() {
        if (waitSeconds == null) {
            waitSeconds = DEFAULT_WAIT_SECONDS;
        } else if (waitSeconds > MAX_WAIT_SECONDS) {
            return MAX_WAIT_SECONDS;
        }
        return waitSeconds;
    }

    public String getMessageId() {
        Snowflake snowflake = IdUtil.getSnowflake(1, 1);
        String s = snowflake.nextIdStr();
        int i = (waitReply ? 1 : 0) | ((saveLog ? 1 : 0) << 1);
        String format = String.format("%02x", (byte) i);
        return format + ":" + s;
    }

    public static boolean isWaitReplyByMessageId(String messageId) {
        if (StrUtil.isEmpty(messageId) || !messageId.contains(":")) return false;
        String[] split = messageId.split("\\:");
        String s = split[0];
        byte[] bytes = toBytes(s);
        int i = bytes[0];
        return (i & 1) > 0 ? true : false;
    }

    public static boolean isSaveLogByMessageId(String messageId) {
        if (StrUtil.isEmpty(messageId) || !messageId.contains(":")) return false;
        String[] split = messageId.split("\\:");
        String s = split[0];
        byte[] bytes = toBytes(s);
        int i = bytes[0];
        return (i & (1 << 1)) > 0 ? true : false;
    }

    private static byte[] toBytes(String s) {
        final int len = s.length();
        if (len % 2 != 0)
            throw new IllegalArgumentException("hexBinary needs to be even-length: " + s);
        byte[] out = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            int h = hexToBin(s.charAt(i));
            int l = hexToBin(s.charAt(i + 1));
            if (h == -1 || l == -1)
                throw new IllegalArgumentException("contains illegal character for hexBinary: " + s);

            out[i / 2] = (byte) (h * 16 + l);
        }
        return out;
    }

    private static int hexToBin(char ch) {
        if ('0' <= ch && ch <= '9') return ch - '0';
        if ('A' <= ch && ch <= 'F') return ch - 'A' + 10;
        if ('a' <= ch && ch <= 'f') return ch - 'a' + 10;
        return -1;
    }
}