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<?php

/**
 * This file is part of the Lean Mapper library (http://www.leanmapper.com)
 *
 * Copyright (c) 2013 Vojtěch Kohout (aka Tharos)
 *
 * For the full copyright and license information, please view the file
 * license-mit.txt that was distributed with this source code.
 */

namespace LeanMapper;

use DibiRow;
use LeanMapper\Exception\InvalidArgumentException;
use LeanMapper\Exception\InvalidStateException;
use LeanMapper\Reflection\AnnotationsParser;
use ReflectionClass;

/**
 * Base class for concrete repositories
 *
 * @author Vojtěch Kohout
 */
abstract class Repository
{

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

    /** @var IMapper */
    protected $mapper;

    /** @var IEntityFactory */
    protected $entityFactory;

    /** @var string */
    protected $table;

    /** @var string */
    protected $entityClass;

    /** @var Events */
    protected $events;

    /** @var string */
    private $docComment;

    /** @var bool */
    private $tableAnnotationChecked = false;


    /**
     * @param Connection $connection
     * @param IMapper $mapper
     * @param IEntityFactory $entityFactory
     */
    public function __construct(Connection $connection, IMapper $mapper, IEntityFactory $entityFactory)
    {
        $this->connection = $connection;
        $this->mapper = $mapper;
        $this->entityFactory = $entityFactory;
        $this->events = new Events;
        $this->initEvents();
    }

    /**
     * @param string $name
     * @return array|null
     */
    public function &__get($name)
    {
        if (preg_match('#^on[A-Z]#', $name)) {
            return $this->events->getCallbacksReference(lcfirst(substr($name, 2)));
        }
    }

    /**
     * @return Fluent
     */
    protected function createFluent(/*$filterArg1, $filterArg2, ...*/)
    {
        $table = $this->getTable();
        $statement = $this->connection->select('%n.*', $table)->from($table);
        $filters = $this->mapper->getImplicitFilters($this->mapper->getEntityClass($table), new Caller($this));
        if (!empty($filters)) {
            $funcArgs = func_get_args();
            if (!($filters instanceof ImplicitFilters)) {
                $filters = new ImplicitFilters($filters);
            }
            $targetedArgs = $filters->getTargetedArgs();
            foreach ($filters->getFilters() as $filter) {
                $args = array($filter);
                if (is_string($filter) and array_key_exists($filter, $targetedArgs)) {
                    $args = array_merge($args, $targetedArgs[$filter]);
                }
                if (!empty($funcArgs)) {
                    $args = array_merge($args, $funcArgs);
                }
                call_user_func_array(array($statement, 'applyFilter'), $args);
            }
        }
        return $statement;
    }

    /**
     * Allows initialize repository's events
     */
    protected function initEvents()
    {
    }

    /**
     * Stores values of entity's modified properties into database (inserts new row when entity is in detached state)
     *
     * @param Entity $entity
     * @return mixed
     */
    public function persist(Entity $entity)
    {
        $this->checkEntityType($entity);

        $this->events->invokeCallbacks(Events::EVENT_BEFORE_PERSIST, $entity);
        if ($entity->isDetached()) {
            $entity->makeAlive($this->entityFactory, $this->connection, $this->mapper);
            $this->events->invokeCallbacks(Events::EVENT_BEFORE_CREATE, $entity);
            $result = $id = $this->insertIntoDatabase($entity);
            $entity->attach($id);
            $this->events->invokeCallbacks(Events::EVENT_AFTER_CREATE, $entity);
        } else {
            if ($entity->isModified()) {
                $this->events->invokeCallbacks(Events::EVENT_BEFORE_UPDATE, $entity);
                $result = $this->updateInDatabase($entity);
                $this->events->invokeCallbacks(Events::EVENT_AFTER_UPDATE, $entity);
            }
            $this->persistHasManyChanges($entity);
            $entity->markAsUpdated();
        }
        $this->events->invokeCallbacks(Events::EVENT_AFTER_PERSIST, $entity);

        return isset($result) ? $result : null;
    }

    /**
     * Removes given entity (or entity with given id) from database
     *
     * @param mixed $arg
     * @return mixed
     * @throws InvalidStateException
     */
    public function delete($arg)
    {
        $this->events->invokeCallbacks(Events::EVENT_BEFORE_DELETE, $arg);
        if ($arg instanceof Entity) {
            $this->checkEntityType($arg);
            if ($arg->isDetached()) {
                throw new InvalidStateException('Cannot delete detached entity.');
            }
        }
        $result = $this->deleteFromDatabase($arg);
        if ($arg instanceof Entity) {
            $arg->detach();
        }
        $this->events->invokeCallbacks(Events::EVENT_AFTER_DELETE, $arg);
        return $result;
    }

    /**
     * Performs database insert (can be customized)
     *
     * @param Entity $entity
     * @return mixed
     */
    protected function insertIntoDatabase(Entity $entity)
    {
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());
        $values = $entity->getModifiedRowData();
        $this->connection->query(
            'INSERT INTO %n %v', $this->getTable(), $values
        );
        return isset($values[$primaryKey]) ? $values[$primaryKey] : $this->connection->getInsertId();
    }

    /**
     * Performs database update (can be customized)
     *
     * @param Entity $entity
     * @return mixed
     */
    protected function updateInDatabase(Entity $entity)
    {
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());
        $values = $entity->getModifiedRowData();
        return $this->connection->query(
            'UPDATE %n SET %a WHERE %n = ?', $this->getTable(), $values, $primaryKey, $this->getIdValue($entity)
        );
    }

    /**
     * Performs database delete (can be customized)
     *
     * @param mixed $arg
     * @return mixed
     */
    protected function deleteFromDatabase($arg)
    {
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());
        $idField = $this->mapper->getEntityField($this->getTable(), $primaryKey);

        $id = ($arg instanceof Entity) ? $arg->$idField : $arg;
        return $this->connection->query(
            'DELETE FROM %n WHERE %n = ?', $this->getTable(), $primaryKey, $id
        );
    }

    /**
     * Persists changes in M:N relationships
     *
     * @param Entity $entity
     */
    protected function persistHasManyChanges(Entity $entity)
    {
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());
        $idField = $this->mapper->getEntityField($this->getTable(), $primaryKey);

        foreach ($entity->getHasManyRowDifferences() as $key => $difference) {
            list($columnReferencingSourceTable, $relationshipTable, $columnReferencingTargetTable) = explode(':', $key);
            $multiInsert = array();
            foreach ($difference as $value => $count) {
                if ($count > 0) {
                    for ($i = 0; $i < $count; $i++) {
                        $multiInsert[] = array(
                            $columnReferencingSourceTable => $entity->$idField,
                            $columnReferencingTargetTable => $value,
                        );
                    }
                } else {
                    $this->connection->query(
                        'DELETE FROM %n WHERE %n = ? AND %n = ? %lmt', $relationshipTable, $columnReferencingSourceTable, $entity->$idField, $columnReferencingTargetTable, $value, -$count
                    );
                }
            }
            if (!empty($multiInsert)) {
                $this->connection->query(
                    'INSERT INTO %n %ex', $relationshipTable, $multiInsert
                );
            }
        }
    }

    /**
     * Creates new Entity instance from given DibiRow instance
     *
     * @param DibiRow $dibiRow
     * @param string|null $entityClass
     * @param string|null $table
     * @return mixed
     */
    protected function createEntity(DibiRow $dibiRow, $entityClass = null, $table = null)
    {
        if ($table === null) {
            $table = $this->getTable();
        }
        $result = Result::createInstance($dibiRow, $table, $this->connection, $this->mapper);
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());

        $row = $result->getRow($dibiRow->$primaryKey);
        if ($entityClass === null) {
            $entityClass = $this->mapper->getEntityClass($this->getTable(), $row);
        }
        $entity = $this->entityFactory->createEntity($entityClass, $row);
        $entity->makeAlive($this->entityFactory);
        return $entity;
    }

    /**
     * Creates new set of Entity's instances from given array of DibiRow instances
     *
     * @param DibiRow[] $rows
     * @param string|null $entityClass
     * @param string|null $table
     * @return array
     */
    protected function createEntities(array $rows, $entityClass = null, $table = null)
    {
        if ($table === null) {
            $table = $this->getTable();
        }
        $entities = array();
        $collection = Result::createInstance($rows, $table, $this->connection, $this->mapper);
        $primaryKey = $this->mapper->getPrimaryKey($this->getTable());
        if ($entityClass !== null) {
            foreach ($rows as $dibiRow) {
                $entity = $this->entityFactory->createEntity(
                    $entityClass, $collection->getRow($dibiRow->$primaryKey)
                );
                $entity->makeAlive($this->entityFactory);
                $entities[$dibiRow->$primaryKey] = $entity;
            }
        } else {
            foreach ($rows as $dibiRow) {
                $row = $collection->getRow($dibiRow->$primaryKey);
                $entityClass = $this->mapper->getEntityClass($this->getTable(), $row);
                $entity = $this->entityFactory->createEntity($entityClass, $row);
                $entity->makeAlive($this->entityFactory);
                $entities[$dibiRow->$primaryKey] = $entity;
            }
        }
        return $this->entityFactory->createCollection($entities);
    }

    /**
     * Gets name of (main) database table related to entity that repository can handle
     *
     * @return string
     * @throws InvalidStateException
     */
    protected function getTable()
    {
        if ($this->table === null) {
            if (!$this->tableAnnotationChecked) {
                $this->tableAnnotationChecked = true;
                $table = AnnotationsParser::parseSimpleAnnotationValue('table', $this->getDocComment());
                if ($table !== null) {
                    return $this->table = $table;
                }
            }
            return $this->mapper->getTableByRepositoryClass(get_called_class());
        }
        return $this->table;
    }

    /**
     * Checks whether give entity is instance of required type
     *
     * @param Entity $entity
     * @throws InvalidArgumentException
     */
    protected function checkEntityType(Entity $entity)
    {
        $entityClass = $this->mapper->getEntityClass($this->getTable());
        if (!($entity instanceof $entityClass)) {
            throw new InvalidArgumentException('Repository ' . get_called_class() . ' can only handle ' . $entityClass . ' entites. Use different repository to handle ' . get_class($entity) . '.');
        }
    }

    ////////////////////
    ////////////////////

    /**
     * @return string
     */
    private function getDocComment()
    {
        if ($this->docComment === null) {
            $reflection = new ReflectionClass(get_called_class());
            $this->docComment = $reflection->getDocComment();
        }
        return $this->docComment;
    }

    /**
     * @param Entity $entity
     * @return mixed
     */
    private function getIdValue(Entity $entity)
    {
        $table = $this->getTable();
        do {
            $primaryKey = $this->mapper->getPrimaryKey($table);
            $idField = $this->mapper->getEntityField($table, $primaryKey);
            $value = $entity->$idField;
            if (!($value instanceof Entity)) {
                return $value;
            }
            $entity = $value;
            $table = $this->mapper->getTable(get_class($entity));
        } while (true);
    }

}