<?php

namespace Unish;

use Symfony\Component\Process\Process;
use Symfony\Component\Process\Exception\ProcessTimedOutException;

abstract class CommandUnishTestCase extends UnishTestCase {

  // Unix exit codes.
  const EXIT_SUCCESS  = 0;
  const EXIT_ERROR = 1;
  const UNISH_EXITCODE_USER_ABORT = 75; // Same as DRUSH_EXITCODE_USER_ABORT

  /**
   * Code coverage data collected during a single test.
   *
   * @var array
   */
  protected $coverage_data = array();

  /**
   * Process of last executed command.
   *
   * @var Process
   */
  private $process;

  /**
   * Default timeout for commands.
   *
   * @var int
   */
  private $defaultTimeout = 60;

  /**
   * Timeout for command.
   *
   * Reset to $defaultTimeout after executing a command.
   *
   * @var int
   */
  protected $timeout = 60;

  /**
   * Default idle timeout for commands.
   *
   * @var int
   */
  private $defaultIdleTimeout = 15;

  /**
   * Idle timeouts for commands.
   *
   * Reset to $defaultIdleTimeout after executing a command.
   *
   * @var int
   */
  protected $idleTimeout = 15;

  /**
   * Accessor for the last output, trimmed.
   *
   * @return string
   *   Trimmed output as text.
   *
   * @access public
   */
  function getOutput() {
    return trim($this->getOutputRaw());
  }

  /**
   * Accessor for the last output, non-trimmed.
   *
   * @return string
   *   Raw output as text.
   *
   * @access public
   */
  function getOutputRaw() {
    return $this->process ? $this->process->getOutput() : '';
  }

  /**
   * Accessor for the last output, rtrimmed and split on newlines.
   *
   * @return array
   *   Output as array of lines.
   *
   * @access public
   */
  function getOutputAsList() {
    return array_map('rtrim', explode("\n", $this->getOutput()));
  }

  /**
   * Accessor for the last stderr output, trimmed.
   *
   * @return string
   *   Trimmed stderr as text.
   *
   * @access public
   */
  function getErrorOutput() {
    return trim($this->getErrorOutputRaw());
  }

  /**
   * Accessor for the last stderr output, non-trimmed.
   *
   * @return string
   *   Raw stderr as text.
   *
   * @access public
   */
  function getErrorOutputRaw() {
    return $this->process ? $this->process->getErrorOutput() : '';
  }

  /**
   * Accessor for the last stderr output, rtrimmed and split on newlines.
   *
   * @return array
   *   Stderr as array of lines.
   *
   * @access public
   */
  function getErrorOutputAsList() {
    return array_map('rtrim', explode("\n", $this->getErrorOutput()));
  }

  /**
   * Accessor for the last output, decoded from json.
   *
   * @param string $key
   *   Optionally return only a top level element from the json object.
   *
   * @return object
   *   Decoded object.
   */
  function getOutputFromJSON($key = NULL) {
    $json = json_decode($this->getOutput());
    if (isset($key)) {
      $json = $json->{$key}; // http://stackoverflow.com/questions/2925044/hyphens-in-keys-of-object
    }
    return $json;
  }

  /**
   * Actually runs the command.
   *
   * @param string $command
   *   The actual command line to run.
   * @param integer $expected_return
   *   The return code to expect
   * @param sting cd
   *   The directory to run the command in.
   * @param array $env
   *  @todo: Not fully implemented yet. Inheriting environment is hard - http://stackoverflow.com/questions/3780866/why-is-my-env-empty.
   *         @see drush_env().
   *  Extra environment variables.
   * @param string $input
   *   A string representing the STDIN that is piped to the command.
   * @return integer
   *   Exit code. Usually self::EXIT_ERROR or self::EXIT_SUCCESS.
   */
  function execute($command, $expected_return = self::EXIT_SUCCESS, $cd = NULL, $env = NULL, $input = NULL) {
    $return = 1;
    $this->tick();

    // Apply the environment variables we need for our test to the head of the
    // command (excludes Windows). Process does have an $env argument, but it replaces the entire
    // environment with the one given. This *could* be used for ensuring the
    // test ran with a clean environment, but it also makes tests fail hard on
    // Travis, for unknown reasons.
    // @see https://github.com/drush-ops/drush/pull/646
    $prefix = '';
    if($env && !$this->is_windows()) {
      foreach ($env as $env_name => $env_value) {
        $prefix .= $env_name . '=' . self::escapeshellarg($env_value) . ' ';
      }
    }
    $this->log("Executing: $command", 'warning');

    try {
      // Process uses a default timeout of 60 seconds, set it to 0 (none).
      $this->process = new Process($command, $cd, NULL, $input, 0);
      if (!getenv('UNISH_NO_TIMEOUTS')) {
        $this->process->setTimeout($this->timeout)
          ->setIdleTimeout($this->idleTimeout);
      }
      $return = $this->process->run();
      if ($expected_return !== $return) {
        $message = 'Unexpected exit code ' . $return . ' (expected ' . $expected_return . ") for command:\n" .  $command;
        throw new UnishProcessFailedError($message, $this->process);
      }
      // Reset timeouts to default.
      $this->timeout = $this->defaultTimeout;
      $this->idleTimeout = $this->defaultIdleTimeout;
      return $return;
    }
    catch (ProcessTimedOutException $e) {
      if ($e->isGeneralTimeout()) {
        $message = 'Command runtime exceeded ' . $this->timeout . " seconds:\n" .  $command;
      }
      else {
        $message = 'Command had no output for ' . $this->idleTimeout . " seconds:\n" .  $command;
      }
      throw new UnishProcessFailedError($message, $this->process);
    }
  }

  /**
   * Invoke drush in via execute().
   *
   * @param command
    *   A defined drush command such as 'cron', 'status' or any of the available ones such as 'drush pm'.
    * @param args
    *   Command arguments.
    * @param $options
    *   An associative array containing options.
    * @param $site_specification
    *   A site alias or site specification. Include the '@' at start of a site alias.
    * @param $cd
    *   A directory to change into before executing.
    * @param $expected_return
    *   The expected exit code. Usually self::EXIT_ERROR or self::EXIT_SUCCESS.
    * @param $suffix
    *   Any code to append to the command. For example, redirection like 2>&1.
    * @param array $env
   *   Environment variables to pass along to the subprocess. @todo - not used.
    * @return integer
    *   An exit code.
    */
  function drush($command, array $args = array(), array $options = array(), $site_specification = NULL, $cd = NULL, $expected_return = self::EXIT_SUCCESS, $suffix = NULL, $env = array()) {
    $global_option_list = array('simulate', 'root', 'uri', 'include', 'config', 'alias-path', 'ssh-options', 'backend');
    $hide_stderr = FALSE;
    $cmd[] = UNISH_DRUSH;

    // Insert global options.
    foreach ($options as $key => $value) {
      if (in_array($key, $global_option_list)) {
        unset($options[$key]);
        if ($key == 'backend') {
          $hide_stderr = TRUE;
          $value = NULL;
        }
        if (!isset($value)) {
          $cmd[] = "--$key";
        }
        else {
          $cmd[] = "--$key=" . self::escapeshellarg($value);
        }
      }
    }

    if ($level = $this->log_level()) {
      $cmd[] = '--' . $level;
    }
    $cmd[] = "--nocolor";

    // Insert code coverage argument before command, in order for it to be
    // parsed as a global option. This matters for commands like ssh and rsync
    // where options after the command are passed along to external commands.
    $result = $this->getTestResultObject();
    if ($result->getCollectCodeCoverageInformation()) {
      $coverage_file = tempnam(UNISH_TMP, 'drush_coverage');
      if ($coverage_file) {
        $cmd[] = "--drush-coverage=" . $coverage_file;
      }
    }

    // Insert site specification and drush command.
    $cmd[] = empty($site_specification) ? NULL : self::escapeshellarg($site_specification);
    $cmd[] = $command;

    // Insert drush command arguments.
    foreach ($args as $arg) {
      $cmd[] = self::escapeshellarg($arg);
    }
    // insert drush command options
    foreach ($options as $key => $value) {
      if (!isset($value)) {
        $cmd[] = "--$key";
      }
      else {
        $cmd[] = "--$key=" . self::escapeshellarg($value);
      }
    }

    $cmd[] = $suffix;
    if ($hide_stderr) {
      $cmd[] = '2>' . $this->bit_bucket();
    }
    $exec = array_filter($cmd, 'strlen'); // Remove NULLs
    // Set sendmail_path to 'true' to disable any outgoing emails
    // that tests might cause Drupal to send.

    $php_options = (array_key_exists('PHP_OPTIONS', $env)) ? $env['PHP_OPTIONS'] . " " : "";
    // @todo The PHP Options below are not yet honored by execute(). See .travis.yml for an alternative way.
    $env['PHP_OPTIONS'] = "${php_options}-d sendmail_path='true'";
    $return = $this->execute(implode(' ', $exec), $expected_return, $cd, $env);

    // Save code coverage information.
    if (!empty($coverage_file)) {
      $data = unserialize(file_get_contents($coverage_file));
      unlink($coverage_file);
      // Save for appending after the test finishes.
      $this->coverage_data[] = $data;
    }

    return $return;
  }

  /**
   * Override the run method, so we can add in our code coverage data after the
   * test has run.
   *
   * We have to collect all coverage data, merge them and append them as one, to
   * avoid having phpUnit duplicating the test function as many times as drush
   * has been invoked.
   *
   * Runs the test case and collects the results in a TestResult object.
   * If no TestResult object is passed a new one will be created.
   *
   * @param  PHPUnit_Framework_TestResult $result
   * @return PHPUnit_Framework_TestResult
   * @throws PHPUnit_Framework_Exception
   */
  public function run(\PHPUnit_Framework_TestResult $result = NULL) {
    $result = parent::run($result);
    $data = array();
    foreach ($this->coverage_data as $merge_data) {
      foreach ($merge_data as $file => $lines) {
        if (!isset($data[$file])) {
          $data[$file] = $lines;
        }
        else {
          foreach ($lines as $num => $executed) {
            if (!isset($data[$file][$num])) {
              $data[$file][$num] = $executed;
            }
            else {
              $data[$file][$num] = ($executed == 1 ? $executed : $data[$file][$num]);
            }
          }
        }
      }
    }

    // Reset coverage data.
    $this->coverage_data = array();
    if (!empty($data)) {
      $result->getCodeCoverage()->append($data, $this);
    }
    return $result;
  }

  /**
   * A slightly less functional copy of drush_backend_parse_output().
   */
  function parse_backend_output($string) {
    $regex = sprintf(UNISH_BACKEND_OUTPUT_DELIMITER, '(.*)');
    preg_match("/$regex/s", $string, $match);
    if (isset($match[1])) {
      // we have our JSON encoded string
      $output = $match[1];
      // remove the match we just made and any non printing characters
      $string = trim(str_replace(sprintf(UNISH_BACKEND_OUTPUT_DELIMITER, $match[1]), '', $string));
    }

    if (!empty($output)) {
      $data = json_decode($output, TRUE);
      if (is_array($data)) {
        return $data;
      }
    }
    return $string;
  }

  /**
   * Ensure that an expected log message appears in the Drush log.
   *
   *     $this->drush('command', array(), array('backend' => NULL));
   *     $parsed = $this->parse_backend_output($this->getOutput());
   *     $this->assertLogHasMessage($parsed['log'], "Expected message", 'debug')
   *
   * @param $log Parsed log entries from backend invoke
   * @param $message The expected message that must be contained in
   *   some log entry's 'message' field.  Substrings will match.
   * @param $logType The type of log message to look for; all other
   *   types are ignored. If FALSE (the default), then all log types
   *   will be searched.
   */
  function assertLogHasMessage($log, $message, $logType = FALSE) {
    foreach ($log as $entry) {
      if (!$logType || ($entry['type'] == $logType)) {
        if (strpos($entry['message'], $message) !== FALSE) {
          return TRUE;
        }
      }
    }
    $this->fail("Could not find expected message in log: " . $message);
  }

  function drush_major_version() {
    static $major;

    if (!isset($major)) {
      $this->drush('version', array('drush_version'), array('pipe' => NULL));
      $version = trim($this->getOutput());
      list($major) = explode('.', $version);
    }
    return (int)$major;
  }
}