<?php

namespace app\common\base\utils;

/**
 * 后台控制器基类
 * 接口方法权限 必传参数 接口返回 错误抛出 通用参数处理
 */
class BaseUUID {
  protected $flag = 1; // 1
  protected $flagLength = 1; // 1
  protected $env = 7; // 3
  protected $envLength = 3; // 3
  protected $db = 255; // 8
  protected $dbLength = 8; // 8
  protected $server = 255; // 8
  protected $serverLength = 8; // 8
  protected $firstLength = 20;
  protected $secondLength = 31;
  protected $thirdLength = 31;
  protected $first36Length = 4;
  protected $second36Length = 6;
  protected $third36Length = 6;
  protected $timeLength = 42; // 0 - 4398046511103
  protected $randomLength = 12;
  protected $tableLength = 8; // 255
  protected $startTime = '1558713600000'; // 2019/5/25 0:0:0(1558713600000) - 2158/10/6 7:35:11(5956760111103)

  private function fixLength($str = 0, $length = 0, $slot = '0') {
    return substr(str_pad($str, $length, $slot, STR_PAD_LEFT), 0, $length);
  }

  public function _generateUUID($table = -1) {
    $timeStr = $this->generateUUIDTimeBin();
    $firstStr = $this->generateUUIDFirstBin();
    $secondStr = $this->generateUUIDSecondBin($timeStr);
    $thirdStr = $this->generateUUIDThirdBin($timeStr, $table);
    $firstStr36 = $this->fixLength(base_convert($firstStr, 2, 36), $this->first36Length);
    $secondStr36 = $this->fixLength(base_convert($secondStr, 2, 36), $this->second36Length);
    $thirdStr36 = $this->fixLength(base_convert($thirdStr, 2, 36), $this->third36Length);
    return $firstStr36.$secondStr36.$thirdStr36;
  }

  private function generateBin($number = 0, $length = 0) {
    return $this->fixLength(decbin($number), $length);
  }

  private function getMillisecond() {
    list($msec, $sec) = explode(' ', microtime());
    $msectime =  (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
    return substr($msectime,0,13);
  }

  private function generateUUIDTimeBin() {
    $timestamp = $this->getMillisecond();
    // return $this->fixLength(decbin($timestamp - $this->startTime), $this->timeLength);
    return $this->fixLength(decbin(TimeUtils::getMillisecond() - $this->startTime), $this->timeLength);
  }

  private function generateUUIDFirstBin() {
    $flagStr = $this->generateBin($this->flag, $this->flagLength);
    $envStr = $this->generateBin($this->env, $this->envLength);
    $dbStr = $this->generateBin($this->db, $this->dbLength);
    $serverStr = $this->generateBin($this->server, $this->serverLength);
    return $flagStr.$envStr.$dbStr.$serverStr;
  }

  private function generateUUIDSecondBin($timeStr) {
    $startTimeStr = substr($timeStr, 0, $this->secondLength);
    return $startTimeStr;
  }

  private function generateUUIDThirdBin($timeStr, $table = -1) {
    $endTimeStr = substr($timeStr, $this->secondLength);
    $random = $this->generateRandom(1 << $this->randomLength);
    $table = $table === -1 ? $this->generateRandom(1 << $this->tableLength) : $table;
    $randomStr = $this->generateBin($random, $this->randomLength);
    $tableStr =$this->generateBin($table, $this->tableLength);
    return $endTimeStr.$randomStr.$tableStr;
  }

  private function generateRandom($max) {
    return rand(0, $max);
  }

  public function _pasreUUID($uuid) {
    $firstStr36 = substr($uuid, 0, $this->first36Length);
    $secondStr36 = substr($uuid, $this->first36Length, $this->second36Length);
    $thirdStr36 = substr($uuid, $this->first36Length + $this->second36Length);
    $firstStr = $this->pasreBin($firstStr36, $this->firstLength);
    $secondStr = $this->pasreBin($secondStr36, $this->secondLength);
    $thirdStr = $this->pasreBin($thirdStr36, $this->thirdLength);
    [
      'flag' => $flag,
      'env' => $env,
      'db' => $db,
      'server' => $server
    ] = $this->pasreExpand($firstStr);
    $beforeTime = $secondStr;
    [
      'afterTime' => $afterTime,
      'random' => $random,
      'table' => $table,
    ] = $this->pasreThirdStr($thirdStr);
    $timestamp = $this->startTime + bindec($beforeTime.$afterTime);
    return [
      'flag' => $flag,
      'env' => $env,
      'db' => $db,
      'server' => $server,
      'timestamp' => $timestamp,
      'random' => $random,
      'table' => $table,
    ];
  }

  private function pasreBin($str, $length) {
    return $this->fixLength(base_convert($str, 36, 2), $length);
  }

  private function pasreExpand($firstStr) {
    $flag = bindec(substr($firstStr, 0 , $this->flagLength));
    $env = bindec(substr($firstStr, $this->flagLength , $this->envLength));
    $db = bindec(substr($firstStr, $this->flagLength + $this->envLength, $this->dbLength));
    $server = bindec(substr($firstStr, $this->flagLength + $this->envLength + $this->dbLength));
    return [
      'flag' => $flag,
      'env' => $env,
      'db' => $db,
      'server' => $server
    ];
  }

  private function pasreThirdStr($thirdStr) {
    $afterTime = substr($thirdStr, 0, $this->timeLength - $this->secondLength);
    $random = bindec(substr($thirdStr, $this->timeLength - $this->secondLength, $this->randomLength));
    $table = bindec(substr($thirdStr, $this->timeLength - $this->secondLength + $this->randomLength));
    return [
      'afterTime' => $afterTime,
      'random' => $random,
      'table' => $table,
    ];
  }

  public function _pasreTable($uuid) {
    $thirdStr36 = substr($uuid, $this->first36Length + $this->second36Length);
    $thirdStr = $this->pasreBin($thirdStr36, $this->thirdLength);
    [
      'table' => $table,
    ] = $this->pasreThirdStr($thirdStr);
    return $table;
  }
}