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<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Console\Command;

use Symfony\Component\Console\Descriptor\TextDescriptor;
use Symfony\Component\Console\Descriptor\XmlDescriptor;
use Symfony\Component\Console\Input\InputDefinition;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\BufferedOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Application;
use Symfony\Component\Console\Helper\HelperSet;

/**
* Base class for all commands.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @api
*/
class Command
{
    private $application;
    private $name;
    private $processTitle;
    private $aliases = array();
    private $definition;
    private $help;
    private $description;
    private $ignoreValidationErrors = false;
    private $applicationDefinitionMerged = false;
    private $applicationDefinitionMergedWithArgs = false;
    private $code;
    private $synopsis;
    private $helperSet;

    /**
* Constructor.
*
* @param string|null $name The name of the command; passing null means it must be set in configure()
*
* @throws \LogicException When the command name is empty
*
* @api
*/
    public function __construct($name = null)
    {
        $this->definition = new InputDefinition();

        if (null !== $name) {
            $this->setName($name);
        }

        $this->configure();

        if (!$this->name) {
            throw new \LogicException('The command name cannot be empty.');
        }
    }

    /**
* Ignores validation errors.
*
* This is mainly useful for the help command.
*/
    public function ignoreValidationErrors()
    {
        $this->ignoreValidationErrors = true;
    }

    /**
* Sets the application instance for this command.
*
* @param Application $application An Application instance
*
* @api
*/
    public function setApplication(Application $application = null)
    {
        $this->application = $application;
        if ($application) {
            $this->setHelperSet($application->getHelperSet());
        } else {
            $this->helperSet = null;
        }
    }

    /**
* Sets the helper set.
*
* @param HelperSet $helperSet A HelperSet instance
*/
    public function setHelperSet(HelperSet $helperSet)
    {
        $this->helperSet = $helperSet;
    }

    /**
* Gets the helper set.
*
* @return HelperSet A HelperSet instance
*/
    public function getHelperSet()
    {
        return $this->helperSet;
    }

    /**
* Gets the application instance for this command.
*
* @return Application An Application instance
*
* @api
*/
    public function getApplication()
    {
        return $this->application;
    }

    /**
* Checks whether the command is enabled or not in the current environment
*
* Override this to check for x or y and return false if the command can not
* run properly under the current conditions.
*
* @return bool
*/
    public function isEnabled()
    {
        return true;
    }

    /**
* Configures the current command.
*/
    protected function configure()
    {
    }

    /**
* Executes the current command.
*
* This method is not abstract because you can use this class
* as a concrete class. In this case, instead of defining the
* execute() method, you set the code to execute by passing
* a Closure to the setCode() method.
*
* @param InputInterface $input An InputInterface instance
* @param OutputInterface $output An OutputInterface instance
*
* @return null|int null or 0 if everything went fine, or an error code
*
* @throws \LogicException When this abstract method is not implemented
* @see setCode()
*/
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        throw new \LogicException('You must override the execute() method in the concrete command class.');
    }

    /**
* Interacts with the user.
*
* @param InputInterface $input An InputInterface instance
* @param OutputInterface $output An OutputInterface instance
*/
    protected function interact(InputInterface $input, OutputInterface $output)
    {
    }

    /**
* Initializes the command just after the input has been validated.
*
* This is mainly useful when a lot of commands extends one main command
* where some things need to be initialized based on the input arguments and options.
*
* @param InputInterface $input An InputInterface instance
* @param OutputInterface $output An OutputInterface instance
*/
    protected function initialize(InputInterface $input, OutputInterface $output)
    {
    }

    /**
* Runs the command.
*
* The code to execute is either defined directly with the
* setCode() method or by overriding the execute() method
* in a sub-class.
*
* @param InputInterface $input An InputInterface instance
* @param OutputInterface $output An OutputInterface instance
*
* @return int The command exit code
*
* @throws \Exception
*
* @see setCode()
* @see execute()
*
* @api
*/
    public function run(InputInterface $input, OutputInterface $output)
    {
        if (null !== $this->processTitle) {
            if (function_exists('cli_set_process_title')) {
                cli_set_process_title($this->processTitle);
            } elseif (function_exists('setproctitle')) {
                setproctitle($this->processTitle);
            } elseif (OutputInterface::VERBOSITY_VERY_VERBOSE === $output->getVerbosity()) {
                $output->writeln('<comment>Install the proctitle PECL to be able to change the process title.</comment>');
            }
        }

        // force the creation of the synopsis before the merge with the app definition
        $this->getSynopsis();

        // add the application arguments and options
        $this->mergeApplicationDefinition();

        // bind the input against the command specific arguments/options
        try {
            $input->bind($this->definition);
        } catch (\Exception $e) {
            if (!$this->ignoreValidationErrors) {
                throw $e;
            }
        }

        $this->initialize($input, $output);

        if ($input->isInteractive()) {
            $this->interact($input, $output);
        }

        $input->validate();

        if ($this->code) {
            $statusCode = call_user_func($this->code, $input, $output);
        } else {
            $statusCode = $this->execute($input, $output);
        }

        return is_numeric($statusCode) ? (int) $statusCode : 0;
    }

    /**
* Sets the code to execute when running this command.
*
* If this method is used, it overrides the code defined
* in the execute() method.
*
* @param callable $code A callable(InputInterface $input, OutputInterface $output)
*
* @return Command The current instance
*
* @throws \InvalidArgumentException
*
* @see execute()
*
* @api
*/
    public function setCode($code)
    {
        if (!is_callable($code)) {
            throw new \InvalidArgumentException('Invalid callable provided to Command::setCode.');
        }

        $this->code = $code;

        return $this;
    }

    /**
* Merges the application definition with the command definition.
*
* This method is not part of public API and should not be used directly.
*
* @param bool $mergeArgs Whether to merge or not the Application definition arguments to Command definition arguments
*/
    public function mergeApplicationDefinition($mergeArgs = true)
    {
        if (null === $this->application || (true === $this->applicationDefinitionMerged && ($this->applicationDefinitionMergedWithArgs || !$mergeArgs))) {
            return;
        }

        if ($mergeArgs) {
            $currentArguments = $this->definition->getArguments();
            $this->definition->setArguments($this->application->getDefinition()->getArguments());
            $this->definition->addArguments($currentArguments);
        }

        $this->definition->addOptions($this->application->getDefinition()->getOptions());

        $this->applicationDefinitionMerged = true;
        if ($mergeArgs) {
            $this->applicationDefinitionMergedWithArgs = true;
        }
    }

    /**
* Sets an array of argument and option instances.
*
* @param array|InputDefinition $definition An array of argument and option instances or a definition instance
*
* @return Command The current instance
*
* @api
*/
    public function setDefinition($definition)
    {
        if ($definition instanceof InputDefinition) {
            $this->definition = $definition;
        } else {
            $this->definition->setDefinition($definition);
        }

        $this->applicationDefinitionMerged = false;

        return $this;
    }

    /**
* Gets the InputDefinition attached to this Command.
*
* @return InputDefinition An InputDefinition instance
*
* @api
*/
    public function getDefinition()
    {
        return $this->definition;
    }

    /**
* Gets the InputDefinition to be used to create XML and Text representations of this Command.
*
* Can be overridden to provide the original command representation when it would otherwise
* be changed by merging with the application InputDefinition.
*
* This method is not part of public API and should not be used directly.
*
* @return InputDefinition An InputDefinition instance
*/
    public function getNativeDefinition()
    {
        return $this->getDefinition();
    }

    /**
* Adds an argument.
*
* @param string $name The argument name
* @param int $mode The argument mode: InputArgument::REQUIRED or InputArgument::OPTIONAL
* @param string $description A description text
* @param mixed $default The default value (for InputArgument::OPTIONAL mode only)
*
* @return Command The current instance
*
* @api
*/
    public function addArgument($name, $mode = null, $description = '', $default = null)
    {
        $this->definition->addArgument(new InputArgument($name, $mode, $description, $default));

        return $this;
    }

    /**
* Adds an option.
*
* @param string $name The option name
* @param string $shortcut The shortcut (can be null)
* @param int $mode The option mode: One of the InputOption::VALUE_* constants
* @param string $description A description text
* @param mixed $default The default value (must be null for InputOption::VALUE_REQUIRED or InputOption::VALUE_NONE)
*
* @return Command The current instance
*
* @api
*/
    public function addOption($name, $shortcut = null, $mode = null, $description = '', $default = null)
    {
        $this->definition->addOption(new InputOption($name, $shortcut, $mode, $description, $default));

        return $this;
    }

    /**
* Sets the name of the command.
*
* This method can set both the namespace and the name if
* you separate them by a colon (:)
*
* $command->setName('foo:bar');
*
* @param string $name The command name
*
* @return Command The current instance
*
* @throws \InvalidArgumentException When the name is invalid
*
* @api
*/
    public function setName($name)
    {
        $this->validateName($name);

        $this->name = $name;

        return $this;
    }

    /**
* Sets the process title of the command.
*
* This feature should be used only when creating a long process command,
* like a daemon.
*
* PHP 5.5+ or the proctitle PECL library is required
*
* @param string $title The process title
*
* @return Command The current instance
*/
    public function setProcessTitle($title)
    {
        $this->processTitle = $title;

        return $this;
    }

    /**
* Returns the command name.
*
* @return string The command name
*
* @api
*/
    public function getName()
    {
        return $this->name;
    }

    /**
* Sets the description for the command.
*
* @param string $description The description for the command
*
* @return Command The current instance
*
* @api
*/
    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

    /**
* Returns the description for the command.
*
* @return string The description for the command
*
* @api
*/
    public function getDescription()
    {
        return $this->description;
    }

    /**
* Sets the help for the command.
*
* @param string $help The help for the command
*
* @return Command The current instance
*
* @api
*/
    public function setHelp($help)
    {
        $this->help = $help;

        return $this;
    }

    /**
* Returns the help for the command.
*
* @return string The help for the command
*
* @api
*/
    public function getHelp()
    {
        return $this->help;
    }

    /**
* Returns the processed help for the command replacing the %command.name% and
* %command.full_name% patterns with the real values dynamically.
*
* @return string The processed help for the command
*/
    public function getProcessedHelp()
    {
        $name = $this->name;

        $placeholders = array(
            '%command.name%',
            '%command.full_name%'
        );
        $replacements = array(
            $name,
            $_SERVER['PHP_SELF'].' '.$name
        );

        return str_replace($placeholders, $replacements, $this->getHelp());
    }

    /**
* Sets the aliases for the command.
*
* @param array $aliases An array of aliases for the command
*
* @return Command The current instance
*
* @throws \InvalidArgumentException When an alias is invalid
*
* @api
*/
    public function setAliases($aliases)
    {
        foreach ($aliases as $alias) {
            $this->validateName($alias);
        }

        $this->aliases = $aliases;

        return $this;
    }

    /**
* Returns the aliases for the command.
*
* @return array An array of aliases for the command
*
* @api
*/
    public function getAliases()
    {
        return $this->aliases;
    }

    /**
* Returns the synopsis for the command.
*
* @return string The synopsis
*/
    public function getSynopsis()
    {
        if (null === $this->synopsis) {
            $this->synopsis = trim(sprintf('%s %s', $this->name, $this->definition->getSynopsis()));
        }

        return $this->synopsis;
    }

    /**
* Gets a helper instance by name.
*
* @param string $name The helper name
*
* @return mixed The helper value
*
* @throws \InvalidArgumentException if the helper is not defined
*
* @api
*/
    public function getHelper($name)
    {
        return $this->helperSet->get($name);
    }

    /**
* Returns a text representation of the command.
*
* @return string A string representing the command
*
* @deprecated Deprecated since version 2.3, to be removed in 3.0.
*/
    public function asText()
    {
        $descriptor = new TextDescriptor();
        $output = new BufferedOutput(BufferedOutput::VERBOSITY_NORMAL, true);
        $descriptor->describe($output, $this, array('raw_output' => true));

        return $output->fetch();
    }

    /**
* Returns an XML representation of the command.
*
* @param bool $asDom Whether to return a DOM or an XML string
*
* @return string|\DOMDocument An XML string representing the command
*
* @deprecated Deprecated since version 2.3, to be removed in 3.0.
*/
    public function asXml($asDom = false)
    {
        $descriptor = new XmlDescriptor();

        if ($asDom) {
            return $descriptor->getCommandDocument($this);
        }

        $output = new BufferedOutput();
        $descriptor->describe($output, $this);

        return $output->fetch();
    }

    /**
* Validates a command name.
*
* It must be non-empty and parts can optionally be separated by ":".
*
* @param string $name
*
* @throws \InvalidArgumentException When the name is invalid
*/
    private function validateName($name)
    {
        if (!preg_match('/^[^\:]++(\:[^\:]++)*$/', $name)) {
            throw new \InvalidArgumentException(sprintf('Command name "%s" is invalid.', $name));
        }
    }
}
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