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<?php

namespace Corals\Foundation\Traits;

use Illuminate\Support\Str;
use Illuminate\Database\Eloquent\Relations\Pivot;

use Illuminate\Database\Eloquent\Builder;
use Corals\Foundation\Models\Relations\HasManyDeep;

use Corals\Foundation\Models\Relations\BelongsToThrough;

use Illuminate\Database\Eloquent\Model;
use Exception;
use InvalidArgumentException;


trait BaseRelations
{

    /**
     * Define a has-many-deep relationship.
     *
     * @param  string $related
     * @param  array $through
     * @param  array $foreignKeys
     * @param  array $localKeys
     * @return hasManyDeep
     */
    public function hasManyDeep($related, array $through, array $foreignKeys = [], array $localKeys = [])
    {
        $relatedInstance = $this->newRelatedInstance($related);
        $throughParents = array_map(function ($class) {
            return Str::contains($class, '\\') ? new $class : (new Pivot)->setTable($class);
        }, $through);
        foreach (array_merge([$this], $throughParents) as $i => $instance) {
            if (!isset($foreignKeys[$i])) {
                if ($instance instanceof Pivot) {
                    $foreignKeys[$i] = ($throughParents[$i] ?? $relatedInstance)->getKeyName();
                } else {
                    $foreignKeys[$i] = $instance->getForeignKey();
                }
            }
            if (!isset($localKeys[$i])) {
                if ($instance instanceof Pivot) {
                    $localKeys[$i] = ($throughParents[$i] ?? $relatedInstance)->getForeignKey();
                } else {
                    $localKeys[$i] = $instance->getKeyName();
                }
            }
        }
        return $this->newhasManyDeep($relatedInstance->newQuery(), $this, $throughParents, $foreignKeys, $localKeys);
    }

    /**
     * Instantiate a new hasManyDeep relationship.
     *
     * @param  \Illuminate\Database\Eloquent\Builder $query
     * @param  \Illuminate\Database\Eloquent\Model $farParent
     * @param  \Illuminate\Database\Eloquent\Model[] $throughParents
     * @param  array $foreignKeys
     * @param  array $localKeys
     * @return hasManyDeep
     */
    protected function newhasManyDeep(Builder $query, Model $farParent, array $throughParents, array $foreignKeys, array $localKeys)
    {
        return new hasManyDeep($query, $farParent, $throughParents, $foreignKeys, $localKeys);
    }


    public function belongsToThrough($related, $through, $localKey = null, $prefix = '', $foreignKeyLookup = [])
    {
        if (!$this instanceof Model) {
            throw new \Exception('belongsToThrough can used on ' . Model::class . ' only.');
        }
        /** @var \Illuminate\Database\Eloquent\Model $relatedModel */
        $relatedModel = new $related();
        $models = [];
        $foreignKeys = [];
        foreach ((array)$through as $key => $model) {
            $foreignKey = null;
            if (is_array($model)) {
                $foreignKey = $model[1];
                $model = $model[0];
            }
            $object = new $model();
            if (!$object instanceof Model) {
                throw new InvalidArgumentException('Through model should be instance of ' . Model::class . '.');
            }
            if ($foreignKey) {
                $foreignKeys[$object->getTable()] = $foreignKey;
            }
            $models[] = $object;
        }
        if (empty($through)) {
            throw new InvalidArgumentException('Provide one or more through model.');
        }
        $models[] = $this;
        foreach ($foreignKeyLookup as $model => $foreignKey) {
            $object = new $model();
            if (!$object instanceof Model) {
                throw new InvalidArgumentException('Through model should be instance of ' . Model::class . '.');
            }
            if ($foreignKey) {
                $foreignKeys[$object->getTable()] = $foreignKey;
            }
        }
        return new belongsToThrough($relatedModel->newQuery(), $this, $models, $localKey, $prefix, $foreignKeys);
    }


}