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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Database\MySQLi;

use CodeIgniter\Database\Forge as BaseForge;

/**
 * Forge for MySQLi
 */
class Forge extends BaseForge
{
    /**
     * CREATE DATABASE statement
     *
     * @var string
     */
    protected $createDatabaseStr = 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';

    /**
     * CREATE DATABASE IF statement
     *
     * @var string
     */
    protected $createDatabaseIfStr = 'CREATE DATABASE IF NOT EXISTS %s CHARACTER SET %s COLLATE %s';

    /**
     * DROP CONSTRAINT statement
     *
     * @var string
     */
    protected $dropConstraintStr = 'ALTER TABLE %s DROP FOREIGN KEY %s';

    /**
     * CREATE TABLE keys flag
     *
     * Whether table keys are created from within the
     * CREATE TABLE statement.
     *
     * @var bool
     */
    protected $createTableKeys = true;

    /**
     * UNSIGNED support
     *
     * @var array
     */
    protected $_unsigned = [
        'TINYINT',
        'SMALLINT',
        'MEDIUMINT',
        'INT',
        'INTEGER',
        'BIGINT',
        'REAL',
        'DOUBLE',
        'DOUBLE PRECISION',
        'FLOAT',
        'DECIMAL',
        'NUMERIC',
    ];

    /**
     * Table Options list which required to be quoted
     *
     * @var array
     */
    protected $_quoted_table_options = [
        'COMMENT',
        'COMPRESSION',
        'CONNECTION',
        'DATA DIRECTORY',
        'INDEX DIRECTORY',
        'ENCRYPTION',
        'PASSWORD',
    ];

    /**
     * NULL value representation in CREATE/ALTER TABLE statements
     *
     * @var string
     *
     * @internal
     */
    protected $null = 'NULL';

    /**
     * CREATE TABLE attributes
     *
     * @param array $attributes Associative array of table attributes
     */
    protected function _createTableAttributes(array $attributes): string
    {
        $sql = '';

        foreach (array_keys($attributes) as $key) {
            if (is_string($key)) {
                $sql .= ' ' . strtoupper($key) . ' = ';

                if (in_array(strtoupper($key), $this->_quoted_table_options, true)) {
                    $sql .= $this->db->escape($attributes[$key]);
                } else {
                    $sql .= $this->db->escapeString($attributes[$key]);
                }
            }
        }

        if (! empty($this->db->charset) && ! strpos($sql, 'CHARACTER SET') && ! strpos($sql, 'CHARSET')) {
            $sql .= ' DEFAULT CHARACTER SET = ' . $this->db->escapeString($this->db->charset);
        }

        if (! empty($this->db->DBCollat) && ! strpos($sql, 'COLLATE')) {
            $sql .= ' COLLATE = ' . $this->db->escapeString($this->db->DBCollat);
        }

        return $sql;
    }

    /**
     * ALTER TABLE
     *
     * @param string       $alterType ALTER type
     * @param string       $table     Table name
     * @param array|string $field     Column definition
     *
     * @return string|string[]
     */
    protected function _alterTable(string $alterType, string $table, $field)
    {
        if ($alterType === 'DROP') {
            return parent::_alterTable($alterType, $table, $field);
        }

        $sql = 'ALTER TABLE ' . $this->db->escapeIdentifiers($table);

        foreach ($field as $i => $data) {
            if ($data['_literal'] !== false) {
                $field[$i] = ($alterType === 'ADD') ? "\n\tADD " . $data['_literal'] : "\n\tMODIFY " . $data['_literal'];
            } else {
                if ($alterType === 'ADD') {
                    $field[$i]['_literal'] = "\n\tADD ";
                } else {
                    $field[$i]['_literal'] = empty($data['new_name']) ? "\n\tMODIFY " : "\n\tCHANGE ";
                }

                $field[$i] = $field[$i]['_literal'] . $this->_processColumn($field[$i]);
            }
        }

        return [$sql . implode(',', $field)];
    }

    /**
     * Process column
     */
    protected function _processColumn(array $field): string
    {
        $extraClause = isset($field['after']) ? ' AFTER ' . $this->db->escapeIdentifiers($field['after']) : '';

        if (empty($extraClause) && isset($field['first']) && $field['first'] === true) {
            $extraClause = ' FIRST';
        }

        return $this->db->escapeIdentifiers($field['name'])
                . (empty($field['new_name']) ? '' : ' ' . $this->db->escapeIdentifiers($field['new_name']))
                . ' ' . $field['type'] . $field['length']
                . $field['unsigned']
                . $field['null']
                . $field['default']
                . $field['auto_increment']
                . $field['unique']
                . (empty($field['comment']) ? '' : ' COMMENT ' . $field['comment'])
                . $extraClause;
    }

    /**
     * Process indexes
     *
     * @param string $table (ignored)
     */
    protected function _processIndexes(string $table): string
    {
        $sql = '';

        for ($i = 0, $c = count($this->keys); $i < $c; $i++) {
            if (is_array($this->keys[$i])) {
                for ($i2 = 0, $c2 = count($this->keys[$i]); $i2 < $c2; $i2++) {
                    if (! isset($this->fields[$this->keys[$i][$i2]])) {
                        unset($this->keys[$i][$i2]);

                        continue;
                    }
                }
            } elseif (! isset($this->fields[$this->keys[$i]])) {
                unset($this->keys[$i]);

                continue;
            }

            if (! is_array($this->keys[$i])) {
                $this->keys[$i] = [$this->keys[$i]];
            }

            $unique = in_array($i, $this->uniqueKeys, true) ? 'UNIQUE ' : '';

            $sql .= ",\n\t{$unique}KEY " . $this->db->escapeIdentifiers(implode('_', $this->keys[$i]))
                . ' (' . implode(', ', $this->db->escapeIdentifiers($this->keys[$i])) . ')';
        }

        $this->keys = [];

        return $sql;
    }

    /**
     * Drop Key
     *
     * @return bool
     */
    public function dropKey(string $table, string $keyName)
    {
        $sql = sprintf(
            $this->dropIndexStr,
            $this->db->escapeIdentifiers($keyName),
            $this->db->escapeIdentifiers($this->db->DBPrefix . $table),
        );

        return $this->db->query($sql);
    }
}

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