<?php
/**
 * For the full copyright and license information, please view the
 * docs/licenses/LICENSE.txt file that was distributed with this source code.
 */

namespace PrestaShop\PrestaShop\Adapter\Module\Configuration;

use Doctrine\DBAL\Connection;
use Exception;
use PrestaShop\PrestaShop\Adapter\Configuration;
use PrestaShop\PrestaShop\Core\Module\ModuleRepository;
use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Finder\Finder;
use Symfony\Component\Process\Exception\InvalidArgumentException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Yaml;

/**
 * This class allow system users and developers to configure their module
 * with a single config file.
 *
 * Use validate() to check everything is ready to run.
 * Use configure() to run the configuration with the provided parameters.
 */
class ModuleSelfConfigurator
{
    /**
     * @var string|null the module name
     */
    protected $module;

    /**
     * @var string|null
     */
    protected $configFile;

    /**
     * @var array
     */
    protected $configs = [];

    /**
     * @var string
     */
    protected $defaultConfigFile = 'self_config.yml';

    /**
     * @var ModuleRepository
     */
    protected $moduleRepository;

    /**
     * @var Configuration
     */
    protected $configuration;

    /**
     * @var Connection
     */
    protected $connection;

    /**
     * @var Filesystem
     */
    protected $filesystem;

    public function __construct(
        ModuleRepository $moduleRepository,
        Configuration $configuration,
        Connection $connection,
        Filesystem $filesystem
    ) {
        $this->module = null;
        $this->configFile = null;

        $this->moduleRepository = $moduleRepository;
        $this->configuration = $configuration;
        $this->connection = $connection;
        $this->filesystem = $filesystem;
    }

    /**
     * Alias for $module setter.
     *
     * @param string $name
     *
     * @return $this
     */
    public function module($name)
    {
        return $this->setModule($name);
    }

    /**
     * Set the module to be updated with its name.
     *
     * @param string $name
     *
     * @return $this
     *
     * @throws UnexpectedTypeException
     */
    public function setModule($name)
    {
        if (!is_string($name)) {
            throw new UnexpectedTypeException($name, 'string');
        }
        $this->module = $name;

        return $this;
    }

    /**
     * If defined, get the config file path or if possible, guess it.
     *
     * @return string|null
     *
     * @throws InvalidArgumentException
     */
    public function getFile()
    {
        // If set, return it
        if ($this->configFile) {
            return $this->configFile;
        }

        // If we do not know in which module to search, we cannot go further
        if (!$this->module) {
            return null;
        }

        // Find and store the first config file we find
        $files = Finder::create()
            ->files()
            ->in(_PS_MODULE_DIR_ . $this->module)
            ->name($this->defaultConfigFile);

        foreach ($files as $file) {
            $this->configFile = $file->getRealPath();

            return $this->configFile;
        }

        return null;
    }

    /**
     *  Alias for config file setter.
     *
     * @param string $filepath
     *
     * @return $this
     */
    public function file($filepath)
    {
        return $this->setFile($filepath);
    }

    /**
     * Set the config file to parse.
     *
     * @param string $filepath
     *
     * @return $this
     *
     * @throws UnexpectedTypeException
     */
    public function setFile($filepath)
    {
        if (!is_string($filepath)) {
            throw new UnexpectedTypeException($filepath, 'string');
        }

        $this->configFile = $filepath;

        return $this;
    }

    /**
     * In order to prevent some failure, we can check all pre-requesites are respected.
     * Any error will be reported in the array.
     *
     * @return array
     */
    public function validate()
    {
        $errors = [];
        if ($this->module === null) {
            $errors[] = 'Module name not specified';
        }

        try {
            $file = $this->getFile();
        } catch (InvalidArgumentException $e) {
            $errors[] = $e->getMessage();
            $file = null;
        }

        if ($file === null) {
            $errors[] = 'No config file to apply';
        } elseif (!file_exists($file)) {
            $errors[] = 'Specified config file is not found';
        } else {
            try {
                $config = $this->loadYmlFile($file);
            } catch (ParseException $e) {
                $errors[] = $e->getMessage();
            }

            if (empty($config)) {
                $errors[] = 'Parsed config file is empty';
            }
        }

        if (!$this->module || !$this->moduleRepository->getModule($this->module)->hasValidInstance()) {
            $errors[] = 'The module specified is invalid';
        }

        return $errors;
    }

    /**
     * Launch the self configuration with all the context previously set!
     *
     * @return bool
     */
    public function configure()
    {
        if (count($this->validate())) {
            return false;
        }
        $config = $this->loadYmlFile($this->getFile());

        $this->runConfigurationStep($config);
        $this->runFilesStep($config);
        $this->runSqlStep($config);
        $this->runPhpStep($config);

        return true;
    }

    // PROTECTED ZONE

    /**
     * Helper function which adds the relative path from the YML config file.
     * Do not alter URLs.
     *
     * @param string $file
     *
     * @return string
     */
    protected function convertRelativeToAbsolutePaths($file)
    {
        // If we do not deal with any kind of URL, add the path to the YML config file
        if (!filter_var($file, FILTER_VALIDATE_URL)) {
            $file = dirname($this->getFile()) . '/' . $file;
        }

        return $file;
    }

    /**
     * Finds and returns filepath from a config key in the YML config file.
     * Can be a string of a value of "file" key.
     *
     * @param array|string $data
     *
     * @return string
     *
     * @throws Exception if file data not provided
     */
    protected function extractFilePath($data)
    {
        if (is_scalar($data)) {
            $file = $data;
        } elseif (is_array($data) && !empty($data['file'])) {
            $file = $data['file'];
        } else {
            throw new Exception('Missing file path');
        }

        return $this->convertRelativeToAbsolutePaths($file);
    }

    /**
     * Require a PHP file and instanciate the class of the same name in it.
     *
     * @param string $file
     *
     * @return object
     */
    protected function loadPhpFile($file)
    {
        // Load file
        require_once $file;

        // Load class of same name as the file
        $className = pathinfo($file, PATHINFO_FILENAME);

        return new $className();
    }

    /**
     * Parse and return the YML content.
     *
     * @param string $file
     *
     * @return array
     */
    protected function loadYmlFile($file)
    {
        if (array_key_exists($file, $this->configs)) {
            return $this->configs[$file];
        }
        $this->configs[$file] = Yaml::parse(file_get_contents($file));

        return $this->configs[$file];
    }

    /**
     * Run configuration for "configuration" step.
     *
     * @param array $config
     */
    protected function runConfigurationStep($config)
    {
        if (empty($config['configuration'])) {
            return;
        }

        if (array_key_exists('update', $config['configuration'])) {
            $this->runConfigurationUpdate($config['configuration']['update']);
        }

        if (array_key_exists('delete', $config['configuration'])) {
            $this->runConfigurationDelete($config['configuration']['delete']);
        }
    }

    /**
     * Run configuration for "file" step.
     *
     * @param array $config
     */
    protected function runFilesStep($config)
    {
        if (empty($config['files'])) {
            return;
        }

        foreach ($config['files'] as $copy) {
            if (empty($copy['source'])) {
                throw new Exception('Missing source file');
            }
            if (empty($copy['dest'])) {
                throw new Exception('Missing destination file');
            }

            // If we get a relative path from the yml, add the original path
            foreach (['source', 'dest'] as $prop) {
                $copy[$prop] = $this->convertRelativeToAbsolutePaths($copy[$prop]);
            }

            $this->filesystem->copy(
                $copy['source'],
                $copy['dest']
            );
        }
    }

    /**
     * Run configuration for "php" step.
     *
     * @param array $config
     */
    protected function runPhpStep($config)
    {
        if (empty($config['php'])) {
            return;
        }

        foreach ($config['php'] as $data) {
            $file = $this->extractFilePath($data);

            $module = $this->moduleRepository->getModule($this->module);
            $params = !empty($data['params']) ? $data['params'] : [];

            $this->loadPhpFile($file)->run($module, $params);
        }
    }

    /**
     * Run configuration for "sql" step.
     *
     * @param array $config
     */
    protected function runSqlStep($config)
    {
        if (empty($config['sql'])) {
            return;
        }

        // Avoid unconsistant state with transactions
        $this->connection->beginTransaction();

        try {
            foreach ($config['sql'] as $data) {
                $this->runSqlFile($data);
            }
            $this->connection->commit();
        } catch (Exception $e) {
            $this->connection->rollBack();

            throw $e;
        }
    }

    /**
     * Subtask of Sql step. Get and prepare all SQL requests from a file.
     *
     * @param array $data
     */
    protected function runSqlFile($data)
    {
        $content = file_get_contents($this->extractFilePath($data));

        foreach (explode(';', $content) as $sql) {
            $sql = trim($sql);
            if (empty($sql)) {
                continue;
            }

            // Set _DB_PREFIX_
            $sql = str_replace(
                [
                    'PREFIX_',
                    'DB_NAME',
                ],
                [
                    $this->configuration->get('_DB_PREFIX_'),
                    $this->configuration->get('_DB_NAME_'),
                ],
                $sql
            );

            $stmt = $this->connection->prepare($sql);
            $stmt->execute();
        }
    }

    /**
     * Subtask of configuration step, for all configuration key to update.
     *
     * @param array $config
     *
     * @throws Exception
     */
    protected function runConfigurationUpdate($config)
    {
        foreach ($config as $key => $data) {
            if (is_array($data) && isset($data['value'])) {
                $value = $data['value'];
            } elseif (is_scalar($data)) {
                // string / integer / decimal / bool
                $value = $data;
            } else {
                throw new Exception(sprintf('No value given for key %s', $key));
            }
            $this->configuration->set($key, $value);
        }
    }

    /**
     * Subtask of configuration step, for all configuration keys to delete.
     *
     * @param array $config
     */
    protected function runConfigurationDelete($config)
    {
        foreach ($config as $key) {
            $this->configuration->remove($key);
        }
    }
}
