<?php

namespace App\Script\Command\Site;

use Symfony\Component\Console\Command\Command as SyCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Helper\ProgressBar;
use App\Filesystem\CreateFile;
use App\Filesystem\CreateDirectory;
use App\Task\TaskInterface;

/**
 * A new Symfony command for creating a new site deployment
 *
 * @author Phil Burton <phil@d3r.com>
 */
class Create extends SyCommand
{
    /**
     * Symfony Progress Bar for command
     *
     * @var Symfony\Component\Console\Helper\ProgressBar
     */
    protected $progressBar;

    /**
     * Array of task sets containing tasks
     *
     * @var mixed
     */
    protected $tasks;

    /**
     * Name of the deployment
     *
     * @var string
     */
    protected $name;

    /**
     * Domain name of the deployment
     *
     * @var string
     */
    protected $domain;

    /**
     * Configure the command
     *
     * @author Phil Burton <phil@d3r.com>
     */
    protected function configure()
    {
        $this->addArgument('name', InputArgument::REQUIRED, 'The name of the new site.');
        $this->addArgument('domain', InputArgument::REQUIRED, 'The domain name of the new site.');

        $this
            ->setName('site:create')
            ->setDescription('Create a new site.')
            ->setHelp('This command allows you to create a new site.');

        $this->addOption(
            'test',
            't',
            InputOption::VALUE_NONE,
            'Run in test mode without any file or directory created?'
        );

        $this->addOption(
            'ignore-config',
            'c',
            InputOption::VALUE_NONE,
            'Ignore writing the config?'
        );

        $this->addOption(
            'ignore-filesystem',
            'f',
            InputOption::VALUE_NONE,
            'Ignore writing the deployment files and directories?'
        );
    }

    /**
     * Run the command
     *
     * @param InputInterface $input
     * @param OutputInterface $output
     * @author Phil Burton <phil@d3r.com>
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $taskCount = 9;
        if ($input->getOption('ignore-filesystem')) {
            $taskCount -= 8;
        }

        if ($input->getOption('ignore-config')) {
            $taskCount -= 1;
        }

        if ($taskCount <= 0) {
            echo "Nothing to do.\n";
            exit;
        }

        $this->name = $input->getArgument('name');
        $this->domain = $input->getArgument('domain');

        $output->writeln(
            'Creating new site with name: '
                . $input->getArgument('name')
                . ' and domain: '
                . $input->getArgument('domain')
        );

        // Set-up progress bar
        $this->progressBar = new ProgressBar($output, $taskCount);
        $this->progressBar->setFormatDefinition('custom', ' %current%/%max% -- %message%');
        $this->progressBar->setFormat('custom');
        $this->progressBar->setMessage('Starting...');
        $this->progressBar->start();
        $this->progressBar->setMessage('Running pre-flight checks');

        // Construct the file commands so we run checks first
        $this->progressBar->advance();

        try {
            $this->runPreflightChecks($input);
        } catch (\Exception $e) {
            $this->complete($output, "Error with pre-flight checks:\n" . $e->getMessage());
        }
        try {
            if (!$input->getOption('test')) {
                if (!$input->getOption('ignore-config')) {
                    $this->createConfig($input);
                }

                if (!$input->getOption('ignore-filesystem')) {
                    $this->createFilesystem($input);
                }
            }
        } catch (\Exception $e) {
            $this->complete($output, "Unexpected Error creating files and directories:\n " . $e->getMessage());
        }
        // Finish up
        $this->complete($output, 'Complete', true);
    }

    /**
     * Show a message and end the program
     * Optionally complete the progress bar
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param OutputInterface $output
     * @param string $message
     * @param boolean $completeProgressBar
     */
    public function complete(OutputInterface $output, string $message, $completeProgressBar = false)
    {
        if ($completeProgressBar) {
            $this->progressBar->advance();
            $this->progressBar->finish();
        }

        $output->writeln('');
        $output->writeln($message);
        exit;
    }

    /**
     * Run the required tasks to check we can complete the full deployment
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param InputInterface $input
     */
    public function runPreflightChecks(InputInterface $input)
    {
        $ignoreFilesystem = $input->getOption('ignore-filesystem');
        $ignoreConfig = $input->getOption('ignore-config');

        if (!$ignoreFilesystem) {
            $this->addTask(
                'check-filesystem',
                'Creating site directory',
                new CreateDirectory(
                    $this->getFullSitesPath($this->name)
                )
            );
        }

        if (!$ignoreConfig) {
            $this->addTask(
                'check-config',
                'Creating nginx config file',
                new CreateFile(
                    CONFIG_ROOT . '/' . $this->name . '.conf',
                    include_once(DIPPER_ROOT . '/nginx/stub.php')
                )
            );
        }
    }

    /**
     * Run the creation of the config tasks
     *
     * @author Phil Burton <phil@pgburton.com>
     */
    public function createConfig()
    {
        $this->runTaskSet('check-config');
    }

    /**
     * Run the creatuion of the filesystem tasks
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param InputInterface $input
     */
    public function createFilesystem(InputInterface $input)
    {
        $this->runTaskSet('check-filesystem');

        $this->runTask(
            'Creating logs directory',
            new CreateDirectory(
                $this->getFullSitesPath($this->name) . '/logs'
            ),
            true
        );

        $this->runTask(
            'Creating access log file',
            new CreateFile(
                $this->getFullSitesPath($this->name) . '/logs/' . $this->name . '.access_log'
            ),
            true
        );

        $this->runTask(
            'Creating error log file',
            new CreateFile(
                $this->getFullSitesPath($this->name) . '/logs/' . $this->name . '.errors_log'
            ),
            true
        );

        $this->runTask(
            'Creating web folder',
            new CreateDirectory(
                $this->getFullSitesPath($this->name) . '/web'
            ),
            true
        );

        $this->runTask(
            'Creating directory index.php',
            new CreateFile(
                $this->getFullSitesPath($this->name) . '/web/index.php'
            ),
            true
        );
    }

    /**
     * Add a task to a task set
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param string $taskSetName
     * @param string $taskName
     * @param TaskInterface $task
     */
    public function addTask(string $taskSetName, string $taskName, TaskInterface $task)
    {
        $this->taskPriority[$taskSetName][] = $taskName;
        $this->tasks[$taskSetName][$taskName] = $task;
    }

    /**
     * Get the array of tasks from a taskset
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param string $taskSetName
     * @return TaskInterface[]
     */
    public function getTaskSet(string $taskSetName)
    {
        $tasks = $this->tasks;
        if (array_key_exists($taskSetName, $tasks)) {
            return $tasks[$taskSetName];
        }

        return false;
    }

    /**
     * Run all the tasks in a taskset
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param string $taskSetName]
     * @param boolean $advanceProgressBar
     */
    public function runTaskSet(string $taskSetName, $advanceProgressBar = false)
    {
        $tasks = $this->getTaskSet($taskSetName);

        if (!$tasks) {
            throw new \Exception('Could not find task set `' . $taskSetName . '`');
        }
        foreach ($this->taskPriority[$taskSetName] as $message) {
            $task = $tasks[$message];
            // Create file in web root for execution
            $this->runTask($message, $task, $advanceProgressBar);
        }
    }

    /**
     * Return the full path of a given file
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param string $path
     * @return string
     */
    protected function getFullSitesPath($path)
    {
        return SITES_ROOT . "/" . $path;
    }

    /**
     * Run a task
     *
     * @author Phil Burton <phil@pgburton.com>
     * @param mixed $task
     * @param string $message
     * @return string
     */
    protected function runTask(string $message, TaskInterface $task, $advanceProgressBar = false)
    {
        if ($advanceProgressBar) {
            $this->progressBar->advance();
            $this->progressBar->setMessage($message);
        }
        $task->execute();
    }
}