<?php

declare(strict_types=1);
/**
 * This file is part of Hyperf.
 *
 * @link     https://www.hyperf.io
 * @document https://hyperf.wiki
 * @contact  group@hyperf.io
 * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
 */
namespace Hyperf\Database\Model\Relations;

use Hyperf\Database\Model\Builder;
use Hyperf\Database\Model\Model;
use Hyperf\Utils\Arr;

class MorphToMany extends BelongsToMany
{
    /**
     * The type of the polymorphic relation.
     *
     * @var string
     */
    protected $morphType;

    /**
     * The class name of the morph type constraint.
     *
     * @var string
     */
    protected $morphClass;

    /**
     * Indicates if we are connecting the inverse of the relation.
     *
     * This primarily affects the morphClass constraint.
     *
     * @var bool
     */
    protected $inverse;

    /**
     * Create a new morph to many relationship instance.
     *
     * @param string $name
     * @param string $table
     * @param string $foreignPivotKey
     * @param string $relatedPivotKey
     * @param string $parentKey
     * @param string $relatedKey
     * @param string $relationName
     * @param bool $inverse
     */
    public function __construct(
        Builder $query,
        Model $parent,
        $name,
        $table,
        $foreignPivotKey,
        $relatedPivotKey,
        $parentKey,
        $relatedKey,
        $relationName = null,
        $inverse = false
    ) {
        $this->inverse = $inverse;
        $this->morphType = $name . '_type';
        $this->morphClass = $inverse ? $query->getModel()->getMorphClass() : $parent->getMorphClass();

        parent::__construct(
            $query,
            $parent,
            $table,
            $foreignPivotKey,
            $relatedPivotKey,
            $parentKey,
            $relatedKey,
            $relationName
        );
    }

    /**
     * Set the constraints for an eager load of the relation.
     */
    public function addEagerConstraints(array $models)
    {
        parent::addEagerConstraints($models);

        $this->query->where($this->table . '.' . $this->morphType, $this->morphClass);
    }

    /**
     * Add the constraints for a relationship count query.
     *
     * @param array|mixed $columns
     * @return \Hyperf\Database\Model\Builder
     */
    public function getRelationExistenceQuery(Builder $query, Builder $parentQuery, $columns = ['*'])
    {
        return parent::getRelationExistenceQuery($query, $parentQuery, $columns)->where(
            $this->table . '.' . $this->morphType,
            $this->morphClass
        );
    }

    /**
     * Create a new pivot model instance.
     *
     * @param bool $exists
     * @return \Hyperf\Database\Model\Relations\Pivot
     */
    public function newPivot(array $attributes = [], $exists = false)
    {
        $using = $this->using;

        $pivot = $using ? $using::fromRawAttributes($this->parent, $attributes, $this->table, $exists)
                        : MorphPivot::fromAttributes($this->parent, $attributes, $this->table, $exists);

        $pivot->setPivotKeys($this->foreignPivotKey, $this->relatedPivotKey)
            ->setMorphType($this->morphType)
            ->setMorphClass($this->morphClass);

        return $pivot;
    }

    /**
     * Get the foreign key "type" name.
     *
     * @return string
     */
    public function getMorphType()
    {
        return $this->morphType;
    }

    /**
     * Get the class name of the parent model.
     *
     * @return string
     */
    public function getMorphClass()
    {
        return $this->morphClass;
    }

    /**
     * Get the indicator for a reverse relationship.
     *
     * @return bool
     */
    public function getInverse()
    {
        return $this->inverse;
    }

    /**
     * Set the where clause for the relation query.
     *
     * @return $this
     */
    protected function addWhereConstraints()
    {
        parent::addWhereConstraints();

        $this->query->where($this->table . '.' . $this->morphType, $this->morphClass);

        return $this;
    }

    /**
     * Create a new pivot attachment record.
     *
     * @param int $id
     * @param bool $timed
     * @return array
     */
    protected function baseAttachRecord($id, $timed)
    {
        return Arr::add(
            parent::baseAttachRecord($id, $timed),
            $this->morphType,
            $this->morphClass
        );
    }

    /**
     * Create a new query builder for the pivot table.
     *
     * @return \Hyperf\Database\Query\Builder
     */
    protected function newPivotQuery()
    {
        return parent::newPivotQuery()->where($this->morphType, $this->morphClass);
    }

    /**
     * Get the pivot columns for the relation.
     *
     * "pivot_" is prefixed at each column for easy removal later.
     *
     * @return array
     */
    protected function aliasedPivotColumns()
    {
        $defaults = [$this->foreignPivotKey, $this->relatedPivotKey, $this->morphType];

        return collect(array_merge($defaults, $this->pivotColumns))->map(function ($column) {
            return $this->table . '.' . $column . ' as pivot_' . $column;
        })->unique()->all();
    }
}
