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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

namespace yii\elasticsearch;

use yii\db\ActiveQueryInterface;
use yii\db\ActiveQueryTrait;
use yii\db\ActiveRelationTrait;

/**
 * ActiveQuery represents a [[Query]] associated with an [[ActiveRecord]] class.
 *
 * An ActiveQuery can be a normal query or be used in a relational context.
 *
 * ActiveQuery instances are usually created by [[ActiveRecord::find()]].
 * Relational queries are created by [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]].
 *
 * Normal Query
 * ------------
 *
 * ActiveQuery mainly provides the following methods to retrieve the query results:
 *
 * - [[one()]]: returns a single record populated with the first row of data.
 * - [[all()]]: returns all records based on the query results.
 * - [[count()]]: returns the number of records.
 * - [[scalar()]]: returns the value of the first column in the first row of the query result.
 * - [[column()]]: returns the value of the first column in the query result.
 * - [[exists()]]: returns a value indicating whether the query result has data or not.
 *
 * Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
 * [[orderBy()]] to customize the query options.
 *
 * ActiveQuery also provides the following additional query options:
 *
 * - [[with()]]: list of relations that this query should be performed with.
 * - [[indexBy()]]: the name of the column by which the query result should be indexed.
 * - [[asArray()]]: whether to return each record as an array.
 *
 * These options can be configured using methods of the same name. For example:
 *
 * ```php
 * $customers = Customer::find()->with('orders')->asArray()->all();
 * ```
 * > NOTE: Elasticsearch limits the number of records returned to 10 records by default.
 * > If you expect to get more records you should specify limit explicitly.
 *
 * Relational query
 * ----------------
 *
 * In relational context ActiveQuery represents a relation between two Active Record classes.
 *
 * Relational ActiveQuery instances are usually created by calling [[ActiveRecord::hasOne()]] and
 * [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining
 * a getter method which calls one of the above methods and returns the created ActiveQuery object.
 *
 * A relation is specified by [[link]] which represents the association between columns
 * of different tables; and the multiplicity of the relation is indicated by [[multiple]].
 *
 * If a relation involves a junction table, it may be specified by [[via()]].
 * This methods may only be called in a relational context. Same is true for [[inverseOf()]], which
 * marks a relation as inverse of another relation.
 *
 * > Note: Elasticsearch limits the number of records returned by any query to 10 records by default.
 * > If you expect to get more records you should specify limit explicitly in relation definition.
 * > This is also important for relations that use [[via()]] so that if via records are limited to 10
 * > the relations records can also not be more than 10.
 *
 * > Note: Currently [[with]] is not supported in combination with [[asArray]].
 *
 * @author Carsten Brandt <mail@cebe.cc>
 * @since 2.0
 */
class ActiveQuery extends Query implements ActiveQueryInterface
{
    use ActiveQueryTrait;
    use ActiveRelationTrait;

    /**
     * @event Event an event that is triggered when the query is initialized via [[init()]].
     */
    const EVENT_INIT = 'init';


    /**
     * Constructor.
     * @param string $modelClass the model class associated with this query
     * @param array $config configurations to be applied to the newly created query object
     */
    public function __construct($modelClass, $config = [])
    {
        $this->modelClass = $modelClass;
        parent::__construct($config);
    }

    /**
     * Initializes the object.
     * This method is called at the end of the constructor. The default implementation will trigger
     * an [[EVENT_INIT]] event. If you override this method, make sure you call the parent implementation at the end
     * to ensure triggering of the event.
     */
    public function init()
    {
        parent::init();
        $this->trigger(self::EVENT_INIT);
    }

    /**
     * Creates a DB command that can be used to execute this query.
     * @param Connection $db the DB connection used to create the DB command.
     * If null, the DB connection returned by [[modelClass]] will be used.
     * @return Command the created DB command instance.
     */
    public function createCommand($db = null)
    {
        if ($this->primaryModel !== null) {
            // lazy loading
            if (is_array($this->via)) {
                // via relation
                /* @var $viaQuery ActiveQuery */
                list($viaName, $viaQuery) = $this->via;
                if ($viaQuery->multiple) {
                    $viaModels = $viaQuery->all();
                    $this->primaryModel->populateRelation($viaName, $viaModels);
                } else {
                    $model = $viaQuery->one();
                    $this->primaryModel->populateRelation($viaName, $model);
                    $viaModels = $model === null ? [] : [$model];
                }
                $this->filterByModels($viaModels);
            } else {
                $this->filterByModels([$this->primaryModel]);
            }
        }

        /* @var $modelClass ActiveRecord */
        $modelClass = $this->modelClass;
        if ($db === null) {
            $db = $modelClass::getDb();
        }

        if ($this->type === null) {
            $this->type = $modelClass::type();
        }
        if ($this->index === null) {
            $this->index = $modelClass::index();
            $this->type = $modelClass::type();
        }
        $commandConfig = $db->getQueryBuilder()->build($this);

        return $db->createCommand($commandConfig);
    }

    /**
     * Executes query and returns all results as an array.
     * @param Connection $db the DB connection used to create the DB command.
     * If null, the DB connection returned by [[modelClass]] will be used.
     * @return array the query results. If the query results in nothing, an empty array will be returned.
     */
    public function all($db = null)
    {
        return parent::all($db);
    }

    /**
     * Converts found rows into model instances
     * @param array $rows
     * @return array|ActiveRecord[]
     * @since 2.0.4
     */
    private function createModels($rows)
    {
        $models = [];
        if ($this->asArray) {
            if ($this->indexBy === null) {
                return $rows;
            }
            foreach ($rows as $row) {
                if (is_string($this->indexBy)) {
                    $key = isset($row['fields'][$this->indexBy]) ? reset($row['fields'][$this->indexBy]) : $row['_source'][$this->indexBy];
                } else {
                    $key = call_user_func($this->indexBy, $row);
                }
                $models[$key] = $row;
            }
        } else {
            /* @var $class ActiveRecord */
            $class = $this->modelClass;
            if ($this->indexBy === null) {
                foreach ($rows as $row) {
                    $model = $class::instantiate($row);
                    $modelClass = get_class($model);
                    $modelClass::populateRecord($model, $row);
                    $models[] = $model;
                }
            } else {
                foreach ($rows as $row) {
                    $model = $class::instantiate($row);
                    $modelClass = get_class($model);
                    $modelClass::populateRecord($model, $row);
                    if (is_string($this->indexBy)) {
                        $key = $model->{$this->indexBy};
                    } else {
                        $key = call_user_func($this->indexBy, $model);
                    }
                    $models[$key] = $model;
                }
            }
        }

        return $models;
    }

    /**
     * @inheritdoc
     * @since 2.0.4
     */
    public function populate($rows)
    {
        if (empty($rows)) {
            return [];
        }

        $models = $this->createModels($rows);
        if (!empty($this->with)) {
            $this->findWith($this->with, $models);
        }
        if (!$this->asArray) {
            foreach ($models as $model) {
                $model->afterFind();
            }
        }

        return $models;
    }

    /**
     * Executes query and returns a single row of result.
     * @param Connection $db the DB connection used to create the DB command.
     * If null, the DB connection returned by [[modelClass]] will be used.
     * @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
     * the query result may be either an array or an ActiveRecord object. Null will be returned
     * if the query results in nothing.
     */
    public function one($db = null)
    {
        if (($result = parent::one($db)) === false) {
            return null;
        }
        if ($this->asArray) {
            // TODO implement with()
//            /* @var $modelClass ActiveRecord */
//            $modelClass = $this->modelClass;
//            $model = $result['_source'];
//            $pk = $modelClass::primaryKey()[0];
//            if ($pk === '_id') {
//                $model['_id'] = $result['_id'];
//            }
//            $model['_score'] = $result['_score'];
//            if (!empty($this->with)) {
//                $models = [$model];
//                $this->findWith($this->with, $models);
//                $model = $models[0];
//            }
            return $result;
        } else {
            /* @var $class ActiveRecord */
            $class = $this->modelClass;
            $model = $class::instantiate($result);
            $class = get_class($model);
            $class::populateRecord($model, $result);
            if (!empty($this->with)) {
                $models = [$model];
                $this->findWith($this->with, $models);
                $model = $models[0];
            }
            $model->afterFind();
            return $model;
        }
    }

    /**
     * @inheritdoc
     */
    public function search($db = null, $options = [])
    {
        if ($this->emulateExecution) {
            return [
                'hits' => [
                    'total' => 0,
                    'hits' => [],
                ],
            ];
        }

        $command = $this->createCommand($db);
        $result = $command->search($options);
        if ($result === false) {
            throw new Exception('Elasticsearch search query failed.', [
                'index' => $command->index,
                'type' => $command->type,
                'query' => $command->queryParts,
                'options' => $command->options,
            ]);
        }

        // TODO implement with() for asArray
        if (!empty($result['hits']['hits']) && !$this->asArray) {
            $models = $this->createModels($result['hits']['hits']);
            if (!empty($this->with)) {
                $this->findWith($this->with, $models);
            }
            foreach ($models as $model) {
                $model->afterFind();
            }
            $result['hits']['hits'] = $models;
        }

        return $result;
    }

    /**
     * @inheritdoc
     */
    public function column($field, $db = null)
    {
        if ($field === '_id') {
            $command = $this->createCommand($db);
            $command->queryParts['_source'] = false;
            $result = $command->search();
            if ($result === false) {
                throw new Exception('Elasticsearch search query failed.');
            }
            if (empty($result['hits']['hits'])) {
                return [];
            }
            $column = [];
            foreach ($result['hits']['hits'] as $row) {
                $column[] = $row['_id'];
            }

            return $column;
        }

        return parent::column($field, $db);
    }
}
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