<?php
/**
 * Orange Management
 *
 * PHP Version 7.4
 *
 * @package   phpOMS\DataStorage\Database\Schema\Grammar
 * @copyright Dennis Eichhorn
 * @license   OMS License 1.0
 * @version   1.0.0
 * @link      https://orange-management.org
 */
declare(strict_types=1);

namespace phpOMS\DataStorage\Database\Schema\Grammar;

use phpOMS\DataStorage\Database\BuilderAbstract;
use phpOMS\DataStorage\Database\Query\Grammar\Grammar as QueryGrammar;
use phpOMS\DataStorage\Database\Schema\QueryType;

/**
 * Database query grammar.
 *
 * @package phpOMS\DataStorage\Database\Schema\Grammar
 * @license OMS License 1.0
 * @link    https://orange-management.org
 * @since   1.0.0
 *
 * @todo Orange-Management/phpOMS#32
 *  Implement schema grammar
 *  Basic create/drop schema grammar created. Next step is to be able to update existing schema and read existing schema.
 */
class Grammar extends QueryGrammar
{
    /**
     * Drop components.
     *
     * @var string[]
     * @since 1.0.0
     */
    protected array $dropDatabaseComponents = [
        'dropDatabase',
    ];

    /**
     * Drop components.
     *
     * @var string[]
     * @since 1.0.0
     */
    protected array $dropTableComponents = [
        'dropTable',
    ];

    /**
     * Select tables components.
     *
     * @var string[]
     * @since 1.0.0
     */
    protected array $createTablesComponents = [
        'createTable',
        'createFields',
        'createTableSettings',
    ];

    /**
     * Select tables components.
     *
     * @var string[]
     * @since 1.0.0
     */
    protected array $tablesComponents = [
        'selectTables',
    ];

    /**
     * Select field components.
     *
     * @var string[]
     * @since 1.0.0
     */
    protected array $fieldsComponents = [
        'selectFields',
    ];

    /**
     * {@inheritdoc}
     */
    protected function getComponents(int $type) : array
    {
        switch ($type) {
            case QueryType::DROP_DATABASE:
                return $this->dropDatabaseComponents;
            case QueryType::TABLES:
                return $this->tablesComponents;
            case QueryType::FIELDS:
                return $this->fieldsComponents;
            case QueryType::CREATE_TABLE:
                return $this->createTablesComponents;
            case QueryType::DROP_TABLE:
                return $this->dropTableComponents;
            default:
                return parent::getComponents($type);
        }
    }

    /**
     * Compile create table query.
     *
     * @param BuilderAbstract $query Query
     * @param string          $table Tables to drop
     *
     * @return string
     *
     * @since 1.0.0
     */
    protected function compileCreateTable(BuilderAbstract $query, string $table) : string
    {
        return 'CREATE TABLE ' . $this->expressionizeTableColumn([$table], $query->getPrefix());
    }

    /**
     * Compile create table settings query.
     *
     * @param BuilderAbstract $query    Query
     * @param bool            $settings Has settings
     *
     * @return string
     *
     * @since 1.0.0
     */
    protected function compileCreateTableSettings(BuilderAbstract $query, bool $settings) : string
    {
        return '';
    }

    /**
     * Compile drop query.
     *
     * @param BuilderAbstract $query Query
     * @param string          $table Tables to drop
     *
     * @return string
     *
     * @since 1.0.0
     */
    protected function compileDropDatabase(BuilderAbstract $query, string $table) : string
    {
        $expression = $this->expressionizeTableColumn([$table], $query->getPrefix());

        if ($expression === '') {
            $expression = '*';
        }

        return 'DROP DATABASE ' . $expression;
    }

    /**
     * Compile drop query.
     *
     * @param BuilderAbstract $query Query
     * @param string          $table Tables to drop
     *
     * @return string
     *
     * @since 1.0.0
     */
    protected function compileDropTable(BuilderAbstract $query, string $table) : string
    {
        $expression = $this->expressionizeTableColumn([$table], $query->getPrefix());

        if ($expression === '') {
            $expression = '*';
        }

        return 'DROP TABLE ' . $expression;
    }
}