<?php

namespace App\Doctrine\ORM\Repository;

use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Doctrine\ORM\QueryBuilder;

abstract class AbstractRepository extends ServiceEntityRepository
{
    /**
     * Parses a nested array and adds expressions to a query builder
     *
     * Example Array:
     *
     *  Input:
     *
     *  $criteria = [
     *      'condition' => 'andX',
     *      'expressions' => [
     *          [
     *              'propertyPath' => 'taskList.project.id',
     *              'operator' => 'eq',
     *              'value' => '1',
     *          ],
     *          [
     *              'propertyPath' => 'taskList.project.workspace.id',
     *              'operator' => 'eq',
     *              'value' => '1',
     *          ],
     *      ],
     *  ];
     *
     * DQL:
     *
     *  SELECT Task
     *  FROM App\Entity\Task Task
     *  INNER JOIN Task.taskList taskList
     *  INNER JOIN Task.project taskList_project
     *  INNER JOIN Task.workspace taskList_project_workspace
     *  WHERE taskList_project.id = 1
     *  AND taskList_project_workspace.id = 1
     *
     * @param QueryBuilder $qb
     * @param array $criteria
     * @param null $alias
     */
    public function filterByCriteria(QueryBuilder $qb, array $criteria, $alias = null)
    {
        $alias = $alias ?: $qb->getRootAliases()[0];
        $expressionBuilder = $this->getEntityManager()->getExpressionBuilder();
        $expressions = [];

        foreach ($criteria['expressions'] as $expression) {
            if (key_exists('condition', $expression)) {
                $expressions[] = $this->filterByCriteria($qb, $expression, $alias);
            } else {

                // Get the operator and value
                switch ($expression['operator']) {
                    case 'eq':
                    case 'neq':
                    case 'lt':
                    case 'lte':
                    case 'gt':
                    case 'gte':
                    case 'between':
                    case 'isNull':
                    case 'isNotNull':
                        break;
                    case 'startsWith':
                        $expression['operator'] = 'LIKE';
                        $expression['value'] = $expression['value'] . '%';
                        break;
                    case 'endsWith':
                        $expression['operator'] = 'LIKE';
                        $expression['value'] = '%' . $expression['value'];
                        break;
                    case 'contains':
                        $expression['operator'] = 'LIKE';
                        $expression['value'] = '%' . $expression['value'] . '%';
                        break;
                }

                // Explode the property path into it's parts
                $propertyPathParts = explode('.', $expression['propertyPath']);
                // Pop the property off the end
                $property = array_pop($propertyPathParts);

                /*
                 * Property is a dot delimited list.
                 * We need to make sure each alias is added
                 * These next few lines add the joins if required
                 *
                 * - task.taskList -> `$qb->join(task.taskList taskList)`
                 * - task.taskList.project -> `$qb->join(taskList.project taskList_project)`
                 * - task.taskList.project.workspace -> `$qb->oin(taskList_project.workspace taskList_project_workspace)`
                 */

                $joinAlias = $alias;
                foreach($propertyPathParts as $count => $propertyPart) {
                    $join = sprintf('%s.%s', $alias, $propertyPart);
                    $joinAlias = implode("_", array_slice($propertyPathParts, 0, $count+1));
                    if(!in_array($joinAlias, $qb->getAllAliases())) {
                        $qb->join($join, $joinAlias);
                    }
                }

                // Now we have the final alias
                // Join the alias and the property together
                $expression['propertyPath'] = sprintf('%s.%s', $joinAlias, $property);
                // Create the arguments
                $expressionArguments = [$expression['propertyPath'], $expression['value']];
                // Create the expression
                $expressions[] = call_user_func_array(
                    [$expressionBuilder, $expression['operator']],
                    $expressionArguments
                );
            }
        }

        // Apply all the expressions
        $expression = call_user_func_array([
            $expressionBuilder,
            $criteria['condition'],
        ], $expressions);

        $qb->andWhere($expression);
    }
}