<?php

namespace Kaliop\eZMigrationBundle\Command;

use Kaliop\eZMigrationBundle\Core\Configuration;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\HttpFoundation\File\Exception\FileException;

class GenerateCommand extends AbstractCommand {

    const DIR_CREATE_PERMISSIONS = 0755;
    private $phpTemplate = '<?php

namespace <namespace>;

use Kaliop\eZMigrationBundle\Interfaces\VersionInterface;
use Symfony\Component\DependencyInjection\ContainerAwareInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Auto-generated Migration definition: Please modify to your needs!
 */
class <version>_place_holder implements VersionInterface, ContainerAwareInterface
{
    /**
     * The dependency injection container
     * @var ContainerInterface
     */
    private $container;

    /**
     * @inheritdoc
     */
    public function execute() {
        // @TODO This method is auto generated, please modify to your needs.
    }

    /**
     * @inheritdoc
     */
    public function setContainer(ContainerInterface $container = null) {
        $this->container = $container;
    }
}
';

    private $ymlTemplate = '
# Auto-generated Migration definition: Please modify to your needs!
-
    mode: [create/update/delete]
    type: [content/content_type/user/user_group/role]
    ';

    private $availableMigrationTypes = array( 'yml', 'php', 'sql' );

    /**
     * @var OutputInterface
     */
    private $output;

    /**
     * Configure the console command
     */
    protected function configure() {
        $this->setName('kaliop:migration:generate')
            ->setDescription('Generate a blank migration definition file.')
            ->addOption('type', null, InputOption::VALUE_OPTIONAL, 'The type of migration file to generate. (yml, php, sql)', 'yml')
            ->addOption('dbserver', null, InputOption::VALUE_OPTIONAL, 'The type of the database server the sql migration is for. (mysql, postgre)', 'mysql')
            ->addArgument('bundle', InputOption::VALUE_REQUIRED, 'The bundle to generate the migration definition file in. eg.: AcmeMigrationBundle' )
            ->setHelp(<<<EOT
The <info>kaliop:migration:generate</info> command generates a skeleton migration definition file:

<info>./ezpublish/console kaliop:migration:generate bundlename</info>

You can optionally specify the file type to generate with <info>--type</info>:

<info>./ezpublish/console kaliop:migration:generate --type=yml bundlename</info>

For SQL type migration you can optionally specify the database server type the migration is for with <info>--dbserver</info>:

<info>./ezpublish/console kaliop:migration:generate --type=sql --dbserver=mysql bundlename</info>
EOT
        );
    }

    /**
     * Run the command and display the results.
     *
     * @throws \InvalidArgumentException When an unsupported file type is selected
     * @param InputInterface $input
     * @param OutputInterface $output
     * @return void
     */
    public function execute( InputInterface $input, OutputInterface $output ) {
        $fileType = $input->getOption('type');
        $dbServer = $input->getOption('dbserver');
        $this->output = $output;

        if (!in_array($fileType, $this->availableMigrationTypes))
        {
            throw new \InvalidArgumentException( 'Unsupported migration file type ' . $fileType );
        }

        $configuration = $this->getConfiguration( $input, $output );

        $version = date('YmdHis');
        $bundleName = $input->getArgument('bundle');

        $path = $this->generateMigrationFile($configuration, $version, $bundleName, $fileType, $dbServer);

        $output->writeln(sprintf("Generated new migration file to <info>%s</info>", $path));
    }

    /**
     * Generates a migration definition file.
     *
     * @throws \InvalidArgumentException When the destination directory does not exists
     * @param Configuration $configuration
     * @param string $version The version string in YYYYMMDDHHMMSS format
     * @param string $bundleName The name of the bundle to generate the migration file for
     * @param string $fileType The type of migration file to generate
     * @param string $dbServer The type of database server the SQL migration is for.
     * @return string The path to the migration file
     */
    protected function generateMigrationFile(Configuration $configuration, $version, $bundleName, $fileType, $dbServer = 'mysql') {

        /** @var $bundle \Symfony\Component\HttpKernel\Bundle\BundleInterface */
        $bundle = $this->getApplication()->getKernel()->getBundle($bundleName);

        $container = $this->getApplication()->getKernel()->getContainer();

        $versionDirectory = $container->getParameter( 'kaliop_bundle_migration.version_directory' );
        $bundleVersionDirectory = $bundle->getPath() . '/' . $versionDirectory;

        if($fileType == 'sql') {
            $path = $bundleVersionDirectory . '/' . $version . '_' . $dbServer . '_place_holder.' . $fileType;
        } else {
            $path = $bundleVersionDirectory . '/' . $version .'_place_holder.' . $fileType;
        }

        switch($fileType) {
            case 'php':
                $template = $this->phpTemplate;
                break;
            case 'sql':
                $template = "-- Autogenerated migration file. Please customise for your needs.";
                break;
            case 'yml':
            default:
                $template = $this->ymlTemplate;
        }

        $placeholders = array(
            '<namespace>',
            '<version>'
        );

        $replacements = array(
            $configuration->versionDirectory . "\\" . $bundleName,
            $version
        );

        $code = str_replace($placeholders, $replacements, $template);

        if(!file_exists($bundleVersionDirectory)) {
            $this->output->writeln( sprintf(
                "Migrations directory <info>%s</info> does not exist. I will create one now....",
                $bundleVersionDirectory
            ) );

            if (mkdir($bundleVersionDirectory, self::DIR_CREATE_PERMISSIONS, true))
            {
                $this->output->writeln( sprintf(
                    "Migrations directory <info>%s</info> has been created",
                    $bundleVersionDirectory
                ) );
            }
            else
            {
                throw new FileException( sprintf(
                    "Failed to create migrations directory %s.",
                    $bundleVersionDirectory
                ) );
            }
        }

        file_put_contents($path, $code);

        return $path;
    }
}