<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\ORM\QueryParams;

use Espo\ORM\QueryParams\Parts\Expression;

use InvalidArgumentException;
use RuntimeException;

class SelectBuilder implements Builder
{
    use SelectingBuilderTrait;

    /**
     * Build a SELECT query.
     */
    public function build(): Select
    {
        return Select::fromRaw($this->params);
    }

    /**
     * Clone an existing query for a subsequent modifying and building.
     */
    public function clone(Select $query): self
    {
        $this->cloneInternal($query);

        return $this;
    }

    /**
     * Set FROM. For what entity type to build a query.
     */
    public function from(string $entityType, ?string $alias = null): self
    {
        if (isset($this->params['from'])) {
            throw new RuntimeException("Method 'from' can be called only once.");
        }

        if (isset($this->params['fromQuery'])) {
            throw new RuntimeException("Method 'from' can't be if 'fromQuery' is set.");
        }

        $this->params['from'] = $entityType;

        if ($alias) {
            $this->params['fromAlias'] = $alias;
        }

        return $this;
    }

    /**
     * Set FROM sub-query.
     */
    public function fromQuery(SelectingQuery $query, string $alias): self
    {
        if (isset($this->params['from'])) {
            throw new RuntimeException("Method 'fromQuery' can be called only once.");
        }

        if (isset($this->params['fromQuery'])) {
            throw new RuntimeException("Method 'fromQuery' can't be if 'from' is set.");
        }

        if ($alias === '') {
            throw new RuntimeException("Alias can't be empty.");
        }

        $this->params['fromQuery'] = $query;

        $this->params['fromAlias'] = $alias;

        return $this;
    }

    /**
     * Set DISTINCT parameter.
     */
    public function distinct(): self
    {
        $this->params['distinct'] = true;

        return $this;
    }

    /**
     * Apply OFFSET and LIMIT.
     */
    public function limit(?int $offset = null, ?int $limit = null): self
    {
        $this->params['offset'] = $offset;
        $this->params['limit'] = $limit;

        return $this;
    }

    /**
     * Specify SELECT. Columns and expressions to be selected. If not called, then
     * all entity attributes will be selected. Passing an array will reset
     * previously set items. Passing a string will append an item.
     *
     * Usage options:
     * * `select([$expr1, $expr2, ...])`
     * * `select([[$expr1, $alias1], [$expr2, $alias2], ...])`
     * * `select(string|Expression $expression)`
     * * `select(string|Expression $expression, string $alias)`
     *
     * @param array|string|Expression $select An array of attributes or one attribute.
     * @param string|null $alias An alias. Actual if the first parameter is a string.
     */
    public function select($select, ?string $alias = null): self
    {
        if (is_array($select)) {
            $this->params['select'] = $this->normilizeExpressionItemArray($select);

            return $this;
        }

        if ($select instanceof Expression) {
            $select = $select->getValue();
        }

        if (is_string($select)) {
            $this->params['select'] = $this->params['select'] ?? [];

            $this->params['select'][] =
                $alias ?
                [$select, $alias] :
                $select;

            return $this;
        }

        throw new InvalidArgumentException();
    }

    /**
     * Specify GROUP BY.
     * Passing an array will reset previously set items.
     * Passing a string will append an item.
     *
     * Usage options:
     * * `groupBy([$expr1, $expr2, ...])`
     * * `groupBy(string|Expression $expression)`
     *
     * @param string|Expression|array $groupBy
     */
    public function groupBy($groupBy): self
    {
        if (is_array($groupBy)) {
            $this->params['groupBy'] = $this->normilizeExpressionItemArray($groupBy);

            return $this;
        }

        if ($groupBy instanceof Expression) {
            $groupBy = $groupBy->getValue();
        }

        if (is_string($groupBy)) {
            $this->params['groupBy'] = $this->params['groupBy'] ?? [];

            $this->params['groupBy'][] = $groupBy;

            return $this;
        }

        throw new InvalidArgumentException();
    }

    /**
     * Use index.
     */
    public function useIndex(string $index): self
    {
        $this->params['useIndex'] = $this->params['useIndex'] ?? [];

        $this->params['useIndex'][] = $index;

        return $this;
    }

    /**
     * Add a HAVING clause.
     *
     * Usage options:
     * * `having(WhereItem $clause)`
     * * `having(array $clause)`
     * * `having(string $key, string $value)`
     *
     * @param WhereItem|array|string $clause A key or where clause.
     * @param array|string|null $value A value. Omitted if the first argument is not string.
     */
    public function having($clause, $value = null): self
    {
        $this->applyWhereClause('havingClause', $clause, $value);

        return $this;
    }

    /**
     * Lock selected rows in shared mode. To be used within a transaction.
     */
    public function forShare(): self
    {
        if (isset($this->params['forUpdate'])) {
            throw new RuntimeException("Can't use two lock modes together.");
        }

        $this->params['forShare'] = true;

        return $this;
    }

    /**
     * Lock selected rows. To be used within a transaction.
     */
    public function forUpdate(): self
    {
        if (isset($this->params['forShare'])) {
            throw new RuntimeException("Can't use two lock modes together.");
        }

        $this->params['forUpdate'] = true;

        return $this;
    }

    /**
     * @todo Remove?
     */
    public function withDeleted(): self
    {
        $this->params['withDeleted'] = true;

        return $this;
    }
}