<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Command;

use Composer\Package\Link;
use Composer\Package\PackageInterface;
use Composer\Package\RootPackage;
use Composer\Repository\InstalledArrayRepository;
use Composer\Repository\CompositeRepository;
use Composer\Repository\RootPackageRepository;
use Composer\Repository\InstalledRepository;
use Composer\Repository\PlatformRepository;
use Composer\Repository\RepositoryFactory;
use Composer\Plugin\CommandEvent;
use Composer\Plugin\PluginEvents;
use Symfony\Component\Console\Formatter\OutputFormatterStyle;
use Composer\Package\Version\VersionParser;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Base implementation for commands mapping dependency relationships.
 *
 * @author Niels Keurentjes <niels.keurentjes@omines.com>
 */
class BaseDependencyCommand extends BaseCommand
{
    const ARGUMENT_PACKAGE = 'package';
    const ARGUMENT_CONSTRAINT = 'version';
    const OPTION_RECURSIVE = 'recursive';
    const OPTION_TREE = 'tree';

    protected $colors;

    /**
     * Execute the command.
     *
     * @param  InputInterface  $input
     * @param  OutputInterface $output
     * @param  bool            $inverted Whether to invert matching process (why-not vs why behaviour)
     * @return int             Exit code of the operation.
     */
    protected function doExecute(InputInterface $input, OutputInterface $output, $inverted = false)
    {
        // Emit command event on startup
        $composer = $this->getComposer();
        $commandEvent = new CommandEvent(PluginEvents::COMMAND, $this->getName(), $input, $output);
        $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);

        $platformOverrides = $composer->getConfig()->get('platform') ?: array();
        $installedRepo = new InstalledRepository(array(
            new RootPackageRepository($composer->getPackage()),
            $composer->getRepositoryManager()->getLocalRepository(),
            new PlatformRepository(array(), $platformOverrides),
        ));

        // Parse package name and constraint
        list($needle, $textConstraint) = array_pad(
            explode(':', $input->getArgument(self::ARGUMENT_PACKAGE)),
            2,
            $input->hasArgument(self::ARGUMENT_CONSTRAINT) ? $input->getArgument(self::ARGUMENT_CONSTRAINT) : '*'
        );

        // Find packages that are or provide the requested package first
        $packages = $installedRepo->findPackagesWithReplacersAndProviders($needle);
        if (empty($packages)) {
            throw new \InvalidArgumentException(sprintf('Could not find package "%s" in your project', $needle));
        }

        // If the version we ask for is not installed then we need to locate it in remote repos and add it.
        // This is needed for why-not to resolve conflicts from an uninstalled version against installed packages.
        if (!$installedRepo->findPackage($needle, $textConstraint)) {
            $defaultRepos = new CompositeRepository(RepositoryFactory::defaultRepos($this->getIO()));
            if ($match = $defaultRepos->findPackage($needle, $textConstraint)) {
                $installedRepo->addRepository(new InstalledArrayRepository(array(clone $match)));
            }
        }

        // Include replaced packages for inverted lookups as they are then the actual starting point to consider
        $needles = array($needle);
        if ($inverted) {
            foreach ($packages as $package) {
                $needles = array_merge($needles, array_map(function (Link $link) {
                    return $link->getTarget();
                }, $package->getReplaces()));
            }
        }

        // Parse constraint if one was supplied
        if ('*' !== $textConstraint) {
            $versionParser = new VersionParser();
            $constraint = $versionParser->parseConstraints($textConstraint);
        } else {
            $constraint = null;
        }

        // Parse rendering options
        $renderTree = $input->getOption(self::OPTION_TREE);
        $recursive = $renderTree || $input->getOption(self::OPTION_RECURSIVE);

        // Resolve dependencies
        $results = $installedRepo->getDependents($needles, $constraint, $inverted, $recursive);
        if (empty($results)) {
            $extra = (null !== $constraint) ? sprintf(' in versions %smatching %s', $inverted ? 'not ' : '', $textConstraint) : '';
            $this->getIO()->writeError(sprintf(
                '<info>There is no installed package depending on "%s"%s</info>',
                $needle,
                $extra
            ));
        } elseif ($renderTree) {
            $this->initStyles($output);
            $root = $packages[0];
            $this->getIO()->write(sprintf('<info>%s</info> %s %s', $root->getPrettyName(), $root->getPrettyVersion(), $root->getDescription()));
            $this->printTree($results);
        } else {
            $this->printTable($output, $results);
        }

        return 0;
    }

    /**
     * Assembles and prints a bottom-up table of the dependencies.
     *
     * @param OutputInterface $output
     * @param array           $results
     */
    protected function printTable(OutputInterface $output, $results)
    {
        $table = array();
        $doubles = array();
        do {
            $queue = array();
            $rows = array();
            foreach ($results as $result) {
                /**
                 * @var PackageInterface $package
                 * @var Link             $link
                 */
                list($package, $link, $children) = $result;
                $unique = (string) $link;
                if (isset($doubles[$unique])) {
                    continue;
                }
                $doubles[$unique] = true;
                $version = $package->getPrettyVersion() === RootPackage::DEFAULT_PRETTY_VERSION ? '-' : $package->getPrettyVersion();
                $rows[] = array($package->getPrettyName(), $version, $link->getDescription(), sprintf('%s (%s)', $link->getTarget(), $link->getPrettyConstraint()));
                if ($children) {
                    $queue = array_merge($queue, $children);
                }
            }
            $results = $queue;
            $table = array_merge($rows, $table);
        } while (!empty($results));

        $this->renderTable($table, $output);
    }

    /**
     * Init styles for tree
     *
     * @param OutputInterface $output
     */
    protected function initStyles(OutputInterface $output)
    {
        $this->colors = array(
            'green',
            'yellow',
            'cyan',
            'magenta',
            'blue',
        );

        foreach ($this->colors as $color) {
            $style = new OutputFormatterStyle($color);
            $output->getFormatter()->setStyle($color, $style);
        }
    }

    /**
     * Recursively prints a tree of the selected results.
     *
     * @param array  $results Results to be printed at this level.
     * @param string $prefix  Prefix of the current tree level.
     * @param int    $level   Current level of recursion.
     */
    protected function printTree($results, $prefix = '', $level = 1)
    {
        $count = count($results);
        $idx = 0;
        foreach ($results as $result) {
            /**
             * @var PackageInterface $package
             * @var Link             $link
             * @var array|bool       $children
             */
            list($package, $link, $children) = $result;

            $color = $this->colors[$level % count($this->colors)];
            $prevColor = $this->colors[($level - 1) % count($this->colors)];
            $isLast = (++$idx == $count);
            $versionText = $package->getPrettyVersion() === RootPackage::DEFAULT_PRETTY_VERSION ? '' : $package->getPrettyVersion();
            $packageText = rtrim(sprintf('<%s>%s</%1$s> %s', $color, $package->getPrettyName(), $versionText));
            $linkText = sprintf('%s <%s>%s</%2$s> %s', $link->getDescription(), $prevColor, $link->getTarget(), $link->getPrettyConstraint());
            $circularWarn = $children === false ? '(circular dependency aborted here)' : '';
            $this->writeTreeLine(rtrim(sprintf("%s%s%s (%s) %s", $prefix, $isLast ? '└──' : '├──', $packageText, $linkText, $circularWarn)));
            if ($children) {
                $this->printTree($children, $prefix . ($isLast ? '   ' : '│  '), $level + 1);
            }
        }
    }

    private function writeTreeLine($line)
    {
        $io = $this->getIO();
        if (!$io->isDecorated()) {
            $line = str_replace(array('└', '├', '──', '│'), array('`-', '|-', '-', '|'), $line);
        }

        $io->write($line);
    }
}
