<?php

namespace Symfony\Component\Console;

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Input\ArrayInput;
use Symfony\Component\Console\Input\InputDefinition;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Output\Output;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Command\HelpCommand;
use Symfony\Component\Console\Command\ListCommand;
use Symfony\Component\Console\Helper\HelperSet;
use Symfony\Component\Console\Helper\FormatterHelper;
use Symfony\Component\Console\Helper\DialogHelper;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

/**
 * An Application is the container for a collection of commands.
 *
 * It is the main entry point of a Console application.
 *
 * This class is optimized for a standard CLI environment.
 *
 * Usage:
 *
 *     $app = new Application('myapp', '1.0 (stable)');
 *     $app->addCommand(new SimpleCommand());
 *     $app->run();
 *
 * @author Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class Application
{
    protected $commands;
    protected $aliases;
    protected $wantHelps = false;
    protected $runningCommand;
    protected $name;
    protected $version;
    protected $catchExceptions;
    protected $autoExit;
    protected $definition;
    protected $helperSet;

    /**
     * Constructor.
     *
     * @param string  $name    The name of the application
     * @param string  $version The version of the application
     */
    public function __construct($name = 'UNKNOWN', $version = 'UNKNOWN')
    {
        $this->name = $name;
        $this->version = $version;
        $this->catchExceptions = true;
        $this->autoExit = true;
        $this->commands = array();
        $this->aliases = array();
        $this->helperSet = new HelperSet(array(
            new FormatterHelper(),
            new DialogHelper(),
        ));

        $this->addCommand(new HelpCommand());
        $this->addCommand(new ListCommand());

        $this->definition = new InputDefinition(array(
            new InputArgument('command', InputArgument::REQUIRED, 'The command to execute'),

            new InputOption('--help',           '-h', InputOption::PARAMETER_NONE, 'Display this help message.'),
            new InputOption('--quiet',          '-q', InputOption::PARAMETER_NONE, 'Do not output any message.'),
            new InputOption('--verbose',        '-v', InputOption::PARAMETER_NONE, 'Increase verbosity of messages.'),
            new InputOption('--version',        '-V', InputOption::PARAMETER_NONE, 'Display this program version.'),
            new InputOption('--ansi',           '-a', InputOption::PARAMETER_NONE, 'Force ANSI output.'),
            new InputOption('--no-interaction', '-n', InputOption::PARAMETER_NONE, 'Do not ask any interactive question.'),
        ));
    }

    /**
     * Runs the current application.
     *
     * @param InputInterface  $input  An Input instance
     * @param OutputInterface $output An Output instance
     *
     * @return integer 0 if everything went fine, or an error code
     *
     * @throws \Exception When doRun returns Exception
     */
    public function run(InputInterface $input = null, OutputInterface $output = null)
    {
        if (null === $input) {
            $input = new ArgvInput();
        }

        if (null === $output) {
            $output = new ConsoleOutput();
        }

        try {
            $statusCode = $this->doRun($input, $output);
        } catch (\Exception $e) {
            if (!$this->catchExceptions) {
                throw $e;
            }

            $this->renderException($e, $output);
            $statusCode = $e->getCode();

            $statusCode = is_numeric($statusCode) && $statusCode ? $statusCode : 1;
        }

        if ($this->autoExit) {
            if ($statusCode > 255) {
                $statusCode = 255;
            }
            // @codeCoverageIgnoreStart
            exit($statusCode);
            // @codeCoverageIgnoreEnd
        } else {
            return $statusCode;
        }
    }

    /**
     * Runs the current application.
     *
     * @param InputInterface  $input  An Input instance
     * @param OutputInterface $output An Output instance
     *
     * @return integer 0 if everything went fine, or an error code
     */
    public function doRun(InputInterface $input, OutputInterface $output)
    {
        $name = $this->getCommandName($input);

        if (true === $input->hasParameterOption(array('--ansi', '-a'))) {
            $output->setDecorated(true);
        }

        if (true === $input->hasParameterOption(array('--help', '-h'))) {
            if (!$name) {
                $name = 'help';
                $input = new ArrayInput(array('command' => 'help'));
            } else {
                $this->wantHelps = true;
            }
        }

        if (true === $input->hasParameterOption(array('--no-interaction', '-n'))) {
            $input->setInteractive(false);
        }

        if (true === $input->hasParameterOption(array('--quiet', '-q'))) {
            $output->setVerbosity(Output::VERBOSITY_QUIET);
        } elseif (true === $input->hasParameterOption(array('--verbose', '-v'))) {
            $output->setVerbosity(Output::VERBOSITY_VERBOSE);
        }

        if (true === $input->hasParameterOption(array('--version', '-V'))) {
            $output->writeln($this->getLongVersion());

            return 0;
        }

        if (!$name) {
            $name = 'list';
            $input = new ArrayInput(array('command' => 'list'));
        }

        // the command name MUST be the first element of the input
        $command = $this->findCommand($name);

        $this->runningCommand = $command;
        $statusCode = $command->run($input, $output);
        $this->runningCommand = null;

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

    /**
     * Set a helper set to be used with the command.
     *
     * @param HelperSet $helperSet The helper set
     */
    public function setHelperSet(HelperSet $helperSet)
    {
        $this->helperSet = $helperSet;
    }

    /**
     * Get the helper set associated with the command
     *
     * @return HelperSet The HelperSet instance associated with this command
     */
    public function getHelperSet()
    {
        return $this->helperSet;
    }

    /**
     * Gets the InputDefinition related to this Application.
     *
     * @return InputDefinition The InputDefinition instance
     */
    public function getDefinition()
    {
        return $this->definition;
    }

    /**
     * Gets the help message.
     *
     * @return string A help message.
     */
    public function getHelp()
    {
        $messages = array(
            $this->getLongVersion(),
            '',
            '<comment>Usage:</comment>',
            sprintf("  [options] command [arguments]\n"),
            '<comment>Options:</comment>',
        );

        foreach ($this->definition->getOptions() as $option) {
            $messages[] = sprintf('  %-29s %s %s',
                '<info>--'.$option->getName().'</info>',
                $option->getShortcut() ? '<info>-'.$option->getShortcut().'</info>' : '  ',
                $option->getDescription()
            );
        }

        return implode("\n", $messages);
    }

    /**
     * Sets whether to catch exceptions or not during commands execution.
     *
     * @param Boolean $boolean Whether to catch exceptions or not during commands execution
     */
    public function setCatchExceptions($boolean)
    {
        $this->catchExceptions = (Boolean) $boolean;
    }

    /**
     * Sets whether to automatically exit after a command execution or not.
     *
     * @param Boolean $boolean Whether to automatically exit after a command execution or not
     */
    public function setAutoExit($boolean)
    {
        $this->autoExit = (Boolean) $boolean;
    }

    /**
     * Gets the name of the application.
     *
     * @return string The application name
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Sets the application name.
     *
     * @param string $name The application name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * Gets the application version.
     *
     * @return string The application version
     */
    public function getVersion()
    {
        return $this->version;
    }

    /**
     * Sets the application version.
     *
     * @param string $version The application version
     */
    public function setVersion($version)
    {
        $this->version = $version;
    }

    /**
     * Returns the long version of the application.
     *
     * @return string The long application version
     */
    public function getLongVersion()
    {
        if ('UNKNOWN' !== $this->getName() && 'UNKNOWN' !== $this->getVersion()) {
            return sprintf('<info>%s</info> version <comment>%s</comment>', $this->getName(), $this->getVersion());
        } else {
            return '<info>Console Tool</info>';
        }
    }

    /**
     * Registers a new command.
     *
     * @param string $name The command name
     *
     * @return Command The newly created command
     */
    public function register($name)
    {
        return $this->addCommand(new Command($name));
    }

    /**
     * Adds an array of command objects.
     *
     * @param Command[] $commands An array of commands
     */
    public function addCommands(array $commands)
    {
        foreach ($commands as $command) {
            $this->addCommand($command);
        }
    }

    /**
     * Adds a command object.
     *
     * If a command with the same name already exists, it will be overridden.
     *
     * @param Command $command A Command object
     *
     * @return Command The registered command
     */
    public function addCommand(Command $command)
    {
        $command->setApplication($this);

        $this->commands[$command->getFullName()] = $command;

        foreach ($command->getAliases() as $alias) {
            $this->aliases[$alias] = $command;
        }

        return $command;
    }

    /**
     * Returns a registered command by name or alias.
     *
     * @param string $name The command name or alias
     *
     * @return Command A Command object
     *
     * @throws \InvalidArgumentException When command name given does not exist
     */
    public function getCommand($name)
    {
        if (!isset($this->commands[$name]) && !isset($this->aliases[$name])) {
            throw new \InvalidArgumentException(sprintf('The command "%s" does not exist.', $name));
        }

        $command = isset($this->commands[$name]) ? $this->commands[$name] : $this->aliases[$name];

        if ($this->wantHelps) {
            $this->wantHelps = false;

            $helpCommand = $this->getCommand('help');
            $helpCommand->setCommand($command);

            return $helpCommand;
        }

        return $command;
    }

    /**
     * Returns true if the command exists, false otherwise
     *
     * @param string $name The command name or alias
     *
     * @return Boolean true if the command exists, false otherwise
     */
    public function hasCommand($name)
    {
        return isset($this->commands[$name]) || isset($this->aliases[$name]);
    }

    /**
     * Returns an array of all unique namespaces used by currently registered commands.
     *
     * It does not returns the global namespace which always exists.
     *
     * @return array An array of namespaces
     */
    public function getNamespaces()
    {
        $namespaces = array();
        foreach ($this->commands as $command) {
            if ($command->getNamespace()) {
                $namespaces[$command->getNamespace()] = true;
            }
        }

        return array_keys($namespaces);
    }

    /**
     * Finds a registered namespace by a name or an abbreviation.
     *
     * @return string A registered namespace
     *
     * @throws \InvalidArgumentException When namespace is incorrect or ambiguous
     */
    public function findNamespace($namespace)
    {
        $abbrevs = static::getAbbreviations($this->getNamespaces());

        if (!isset($abbrevs[$namespace])) {
            throw new \InvalidArgumentException(sprintf('There are no commands defined in the "%s" namespace.', $namespace));
        }

        if (count($abbrevs[$namespace]) > 1) {
            throw new \InvalidArgumentException(sprintf('The namespace "%s" is ambiguous (%s).', $namespace, $this->getAbbreviationSuggestions($abbrevs[$namespace])));
        }

        return $abbrevs[$namespace][0];
    }

    /**
     * Finds a command by name or alias.
     *
     * Contrary to getCommand, this command tries to find the best
     * match if you give it an abbreviation of a name or alias.
     *
     * @param  string $name A command name or a command alias
     *
     * @return Command A Command instance
     *
     * @throws \InvalidArgumentException When command name is incorrect or ambiguous
     */
    public function findCommand($name)
    {
        // namespace
        $namespace = '';
        if (false !== $pos = strrpos($name, ':')) {
            $namespace = $this->findNamespace(substr($name, 0, $pos));
            $name = substr($name, $pos + 1);
        }

        $fullName = $namespace ? $namespace.':'.$name : $name;

        // name
        $commands = array();
        foreach ($this->commands as $command) {
            if ($command->getNamespace() == $namespace) {
                $commands[] = $command->getName();
            }
        }

        $abbrevs = static::getAbbreviations($commands);
        if (isset($abbrevs[$name]) && 1 == count($abbrevs[$name])) {
            return $this->getCommand($namespace ? $namespace.':'.$abbrevs[$name][0] : $abbrevs[$name][0]);
        }

        if (isset($abbrevs[$name]) && count($abbrevs[$name]) > 1) {
            $suggestions = $this->getAbbreviationSuggestions(array_map(function ($command) use ($namespace) { return $namespace.':'.$command; }, $abbrevs[$name]));

            throw new \InvalidArgumentException(sprintf('Command "%s" is ambiguous (%s).', $fullName, $suggestions));
        }

        // aliases
        $abbrevs = static::getAbbreviations(array_keys($this->aliases));
        if (!isset($abbrevs[$fullName])) {
            throw new \InvalidArgumentException(sprintf('Command "%s" is not defined.', $fullName));
        }

        if (count($abbrevs[$fullName]) > 1) {
            throw new \InvalidArgumentException(sprintf('Command "%s" is ambiguous (%s).', $fullName, $this->getAbbreviationSuggestions($abbrevs[$fullName])));
        }

        return $this->getCommand($abbrevs[$fullName][0]);
    }

    /**
     * Gets the commands (registered in the given namespace if provided).
     *
     * The array keys are the full names and the values the command instances.
     *
     * @param  string  $namespace A namespace name
     *
     * @return array An array of Command instances
     */
    public function getCommands($namespace = null)
    {
        if (null === $namespace) {
            return $this->commands;
        }

        $commands = array();
        foreach ($this->commands as $name => $command) {
            if ($namespace === $command->getNamespace()) {
                $commands[$name] = $command;
            }
        }

        return $commands;
    }

    /**
     * Returns an array of possible abbreviations given a set of names.
     *
     * @param array $names An array of names
     *
     * @return array An array of abbreviations
     */
    static public function getAbbreviations($names)
    {
        $abbrevs = array();
        foreach ($names as $name) {
            for ($len = strlen($name) - 1; $len > 0; --$len) {
                $abbrev = substr($name, 0, $len);
                if (!isset($abbrevs[$abbrev])) {
                    $abbrevs[$abbrev] = array($name);
                } else {
                    $abbrevs[$abbrev][] = $name;
                }
            }
        }

        // Non-abbreviations always get entered, even if they aren't unique
        foreach ($names as $name) {
            $abbrevs[$name] = array($name);
        }

        return $abbrevs;
    }

    /**
     * Returns a text representation of the Application.
     *
     * @param string $namespace An optional namespace name
     *
     * @return string A string representing the Application
     */
    public function asText($namespace = null)
    {
        $commands = $namespace ? $this->getCommands($this->findNamespace($namespace)) : $this->commands;

        $messages = array($this->getHelp(), '');
        if ($namespace) {
            $messages[] = sprintf("<comment>Available commands for the \"%s\" namespace:</comment>", $namespace);
        } else {
            $messages[] = '<comment>Available commands:</comment>';
        }

        $width = 0;
        foreach ($commands as $command) {
            $width = strlen($command->getName()) > $width ? strlen($command->getName()) : $width;
        }
        $width += 2;

        // add commands by namespace
        foreach ($this->sortCommands($commands) as $space => $commands) {
            if (!$namespace && '_global' !== $space) {
                $messages[] = '<comment>'.$space.'</comment>';
            }

            foreach ($commands as $command) {
                $aliases = $command->getAliases() ? '<comment> ('.implode(', ', $command->getAliases()).')</comment>' : '';

                $messages[] = sprintf("  <info>%-${width}s</info> %s%s", ($command->getNamespace() ? ':' : '').$command->getName(), $command->getDescription(), $aliases);
            }
        }

        return implode("\n", $messages);
    }

    /**
     * Returns an XML representation of the Application.
     *
     * @param string $namespace An optional namespace name
     * @param Boolean $asDom Whether to return a DOM or an XML string
     *
     * @return string|DOMDocument An XML string representing the Application
     */
    public function asXml($namespace = null, $asDom = false)
    {
        $commands = $namespace ? $this->getCommands($this->findNamespace($namespace)) : $this->commands;

        $dom = new \DOMDocument('1.0', 'UTF-8');
        $dom->formatOutput = true;
        $dom->appendChild($xml = $dom->createElement('symfony'));

        $xml->appendChild($commandsXML = $dom->createElement('commands'));

        if ($namespace) {
            $commandsXML->setAttribute('namespace', $namespace);
        } else {
            $xml->appendChild($namespacesXML = $dom->createElement('namespaces'));
        }

        // add commands by namespace
        foreach ($this->sortCommands($commands) as $space => $commands) {
            if (!$namespace) {
                $namespacesXML->appendChild($namespaceArrayXML = $dom->createElement('namespace'));
                $namespaceArrayXML->setAttribute('id', $space);
            }

            foreach ($commands as $command) {
                if (!$namespace) {
                    $namespaceArrayXML->appendChild($commandXML = $dom->createElement('command'));
                    $commandXML->appendChild($dom->createTextNode($command->getName()));
                }

                $node = $command->asXml(true)->getElementsByTagName('command')->item(0);
                $node = $dom->importNode($node, true);

                $commandsXML->appendChild($node);
            }
        }

        return $asDom ? $dom : $dom->saveXml();
    }

    /**
     * Renders a catched exception.
     *
     * @param Exception       $e      An exception instance
     * @param OutputInterface $output An OutputInterface instance
     */
    public function renderException($e, $output)
    {
        $strlen = function ($string)
        {
            return function_exists('mb_strlen') ? mb_strlen($string) : strlen($string);
        };

        $title = sprintf('  [%s]  ', get_class($e));
        $len = $strlen($title);
        $lines = array();
        foreach (explode("\n", $e->getMessage()) as $line) {
            $lines[] = sprintf('  %s  ', $line);
            $len = max($strlen($line) + 4, $len);
        }

        $messages = array(str_repeat(' ', $len), $title.str_repeat(' ', $len - $strlen($title)));

        foreach ($lines as $line) {
            $messages[] = $line.str_repeat(' ', $len - $strlen($line));
        }

        $messages[] = str_repeat(' ', $len);

        $output->writeln("\n");
        foreach ($messages as $message) {
            $output->writeln('<error>'.$message.'</error>');
        }
        $output->writeln("\n");

        if (null !== $this->runningCommand) {
            $output->writeln(sprintf('<info>%s</info>', sprintf($this->runningCommand->getSynopsis(), $this->getName())));
            $output->writeln("\n");
        }

        if (Output::VERBOSITY_VERBOSE === $output->getVerbosity()) {
            $output->writeln('</comment>Exception trace:</comment>');

            // exception related properties
            $trace = $e->getTrace();
            array_unshift($trace, array(
                'function' => '',
                'file'     => $e->getFile() != null ? $e->getFile() : 'n/a',
                'line'     => $e->getLine() != null ? $e->getLine() : 'n/a',
                'args'     => array(),
            ));

            for ($i = 0, $count = count($trace); $i < $count; $i++) {
                $class = isset($trace[$i]['class']) ? $trace[$i]['class'] : '';
                $type = isset($trace[$i]['type']) ? $trace[$i]['type'] : '';
                $function = $trace[$i]['function'];
                $file = isset($trace[$i]['file']) ? $trace[$i]['file'] : 'n/a';
                $line = isset($trace[$i]['line']) ? $trace[$i]['line'] : 'n/a';

                $output->writeln(sprintf(' %s%s%s() at <info>%s:%s</info>', $class, $type, $function, $file, $line));
            }

            $output->writeln("\n");
        }
    }

    protected function getCommandName(InputInterface $input)
    {
        return $input->getFirstArgument('command');
    }

    protected function sortCommands($commands)
    {
        $namespacedCommands = array();
        foreach ($commands as $name => $command) {
            $key = $command->getNamespace() ? $command->getNamespace() : '_global';

            if (!isset($namespacedCommands[$key])) {
                $namespacedCommands[$key] = array();
            }

            $namespacedCommands[$key][$name] = $command;
        }
        ksort($namespacedCommands);

        foreach ($namespacedCommands as $name => &$commands) {
            ksort($commands);
        }

        return $namespacedCommands;
    }

    protected function getAbbreviationSuggestions($abbrevs)
    {
        return sprintf('%s, %s%s', $abbrevs[0], $abbrevs[1], count($abbrevs) > 2 ? sprintf(' and %d more', count($abbrevs) - 2) : '');
    }
}