<?php

// Make sure we are called from index.php
if (!defined('SECURITY')) die('Hacking attempt');

class Worker extends Base {
  protected $table = 'pool_worker';

  /**
   * Update worker list for a user
   * @param account_id int User ID
   * @param data array All workers and their settings
   * @return bool
   **/
  public function updateWorkers($account_id, $data) {
    $this->debug->append("STA " . __METHOD__, 4);
    if (!is_array($data)) {
      $this->setErrorMessage('No workers to update');
      return false;
    }
    $username = $this->user->getUserName($account_id);
    $iFailed = 0;
    foreach ($data as $key => $value) {
      if ('' === $value['username'] || '' === $value['password']) {
        $iFailed++;
      } else {
        // Prefix the WebUser to Worker name
        $value['username'] = "$username." . $value['username'];
        $stmt = $this->mysqli->prepare("UPDATE $this->table SET password = ?, username = ?, monitor = ? WHERE account_id = ? AND id = ?");
        if ( ! ( $this->checkStmt($stmt) && $stmt->bind_param('ssiii', $value['password'], $value['username'], $value['monitor'], $account_id, $key) && $stmt->execute()) )
          $iFailed++;
      }
    }
    if ($iFailed == 0)
      return true;
    // Catchall
    $this->setErrorMessage('Failed to update ' . $iFailed . ' worker.');
    return false;
  }

  /**
   * Fetch all IDLE workers that have monitoring enabled
   * @param none
   * @return data array Workers in IDLE state and monitoring enabled
   **/
  public function getAllIdleWorkers($interval=600) {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("
      SELECT w.account_id AS account_id, w.id AS id, w.username AS username
      FROM " . $this->share->getTableName() . " AS s
      RIGHT JOIN " . $this->getTableName() . " AS w
      ON w.username = s.username
      AND s.time > DATE_SUB(now(), INTERVAL ? SECOND)
      AND our_result = 'Y'
      WHERE w.monitor = 1
      AND s.id IS NULL
    ");
    if ($this->checkStmt($stmt) && $stmt->bind_param('i', $interval) && $stmt->execute() && $result = $stmt->get_result())
      return $result->fetch_all(MYSQLI_ASSOC);
    // Catchall
    $this->setErrorMessage("Unable to fetch IDLE, monitored workers");
    return false;
  }

  /**
   * Fetch a specific worker and its status
   * @param id int Worker ID
   * @return mixed array Worker details
   **/
  public function getWorker($id) {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("
       SELECT id, username, password, monitor,
       ( SELECT COUNT(id) FROM " . $this->share->getTableName() . " WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)) AS count_all,
       ( SELECT COUNT(id) FROM " . $this->share->getArchiveTableName() . " WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)) AS count_all_archive,
       (
         SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * POW(2, " . $this->config['target_bits'] . ") / 600 / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)
        ) + (
         SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * POW(2, " . $this->config['target_bits'] . ") / 600 / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getArchiveTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)
       ) AS hashrate,
       (
         SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) / count_all, 2), 0)
         FROM " . $this->share->getTableName() . "
         WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)
       ) + (
         SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) / count_all_archive, 2), 0)
         FROM " . $this->share->getArchiveTableName() . "
         WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)
       ) AS difficulty
       FROM $this->table AS w
       WHERE id = ?
       ");
    if ($this->checkStmt($stmt) && $stmt->bind_param('i', $id) && $stmt->execute() && $result = $stmt->get_result())
      return $result->fetch_assoc();
    // Catchall
    return false;
  }

  /**
   * Fetch all workers for an account
   * @param account_id int User ID
   * @return mixed array Workers and their settings or false
   **/
  public function getWorkers($account_id, $interval=600) {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("
      SELECT id, username, password, monitor,
       ( SELECT COUNT(id) FROM " . $this->share->getTableName() . " WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)) AS count_all,
       ( SELECT COUNT(id) FROM " . $this->share->getArchiveTableName() . " WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)) AS count_all_archive,
       (
         SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * 65536 / ? / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) + (
        SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * 65536 / ? / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getArchiveTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) AS hashrate,
      (
        SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) / count_all, 2), 0)
        FROM " . $this->share->getTableName() . "
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) + (
        SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) / count_all_archive, 2), 0)
        FROM " . $this->share->getArchiveTableName() . "
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) AS difficulty
      FROM $this->table AS w
      WHERE account_id = ?");
    if ($this->checkStmt($stmt) && $stmt->bind_param('iiiiiiiii', $interval, $interval, $interval, $interval, $interval, $interval, $interval, $interval, $account_id) && $stmt->execute() && $result = $stmt->get_result())
      return $result->fetch_all(MYSQLI_ASSOC);
    // Catchall
    $this->setErrorMessage('Failed to fetch workers for your account');
    $this->debug->append('Fetching workers failed: ' . $this->mysqli->error);
    return false;
  }

  /**
   * Fetch all workers for admin panel
   * @param limit int 
   * @return mixed array Workers and their settings or false
   **/
  public function getAllWorkers($iLimit=0, $interval=600) {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("
      SELECT id, username, password, monitor,
      IFNULL(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty), 0) AS difficulty,
       (
         SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * 65536 / ? / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) + (
        SELECT
          IFNULL(IF(our_result='Y', ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)) * 65536 / ? / 1000), 0), 0) AS hashrate
          FROM " . $this->share->getArchiveTableName() . "
          WHERE
            username = w.username
          AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) AS hashrate,
      ((
        SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)), 2), 0)
        FROM " . $this->share->getTableName() . "
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) + (
        SELECT IFNULL(ROUND(SUM(IF(difficulty=0, pow(2, (" . $this->config['difficulty'] . " - 16)), difficulty)), 2), 0)
        FROM " . $this->share->getArchiveTableName() . "
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      )) / ((
        SELECT COUNT(id) 
        FROM " . $this->share->getTableName() . " 
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      ) + ( 
        SELECT COUNT(id) 
        FROM " . $this->share->getArchiveTableName() . " 
        WHERE username = w.username AND time > DATE_SUB(now(), INTERVAL ? SECOND)
      )) AS avg_difficulty
      FROM $this->table AS w
      ORDER BY hashrate DESC LIMIT ?");
    if ($this->checkStmt($stmt) && $stmt->bind_param('iiiiiiiii', $interval, $interval, $interval, $interval, $interval, $interval, $interval, $interval, $iLimit) && $stmt->execute() && $result = $stmt->get_result())
      return $result->fetch_all(MYSQLI_ASSOC);
    // Catchall
    $this->setErrorMessage('Failed to fetch workers');
    $this->debug->append('Fetching workers failed: ' . $this->mysqli->error);
    return false;
  }

  /**
   * Get all currently active workers in the past 10 minutes
   * @param none
   * @return data mixed int count if any workers are active, false otherwise
   **/
  public function getCountAllActiveWorkers() {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("
      SELECT COUNT(DISTINCT(username)) AS total
      FROM "  . $this->share->getTableName() . "
      WHERE our_result = 'Y'
      AND time > DATE_SUB(now(), INTERVAL 10 MINUTE)
    ");
    if ($this->checkStmt($stmt) && $stmt->execute() && $result = $stmt->get_result())
      return $result->fetch_object()->total;
    return false;
  }

  /**
   * Add new worker to an existing web account
   * The webuser name is prefixed to the worker name
   * Passwords are plain text for pushpoold
   * @param account_id int User ID
   * @param workerName string Worker name
   * @param workerPassword string Worker password
   * @return bool
   **/
  public function addWorker($account_id, $workerName, $workerPassword) {
    $this->debug->append("STA " . __METHOD__, 4);
    if ('' === $workerName || '' === $workerPassword) {
      $this->setErrorMessage('Worker name and/or password may not be empty');
      return false;
    }
    $username = $this->user->getUserName($account_id);
    $workerName = "$username.$workerName";
    $stmt = $this->mysqli->prepare("INSERT INTO $this->table (account_id, username, password) VALUES(?, ?, ?)");
    if ($this->checkStmt($stmt)) {
      $stmt->bind_param('iss', $account_id, $workerName, $workerPassword);
      if (!$stmt->execute()) {
        $this->setErrorMessage( 'Failed to add worker' );
        if ($stmt->sqlstate == '23000') $this->setErrorMessage( 'Worker already exists' );
        return false;
      }
      return true;
    }
    return false;
  }

  /**
   * Delete existing worker from account
   * @param account_id int User ID
   * @param id int Worker ID
   * @return bool
   **/
  public function deleteWorker($account_id, $id) {
    $this->debug->append("STA " . __METHOD__, 4);
    $stmt = $this->mysqli->prepare("DELETE FROM $this->table WHERE account_id = ? AND id = ?");
    if ($this->checkStmt($stmt)) {
      $stmt->bind_param('ii', $account_id, $id);
      if ($stmt->execute() && $stmt->affected_rows == 1) {
        return true;
      } else {
        $this->setErrorMessage( 'Unable to delete worker' );
      }
    }
    return false;
  }
}

$worker = new Worker();
$worker->setDebug($debug);
$worker->setMysql($mysqli);
$worker->setShare($share);
$worker->setConfig($config);