<?php

/**
 * @package Dotclear
 *
 * @copyright Olivier Meunier & Association Dotclear
 * @copyright AGPL-3.0
 */
declare(strict_types=1);

namespace Dotclear\Schema\Database\Mysqlimb4;

use Dotclear\Exception\DatabaseException;
use Dotclear\Schema\Database\Mysqli\Handler as MysqliHandler;
use mysqli;

/**
 * @class Handler
 *
 * MySQL (utf8mb4) Database handler
 */
class Handler extends MysqliHandler
{
    public const HANDLER_NAME   = 'MySQLi full UTF-8';

    public const HANDLER_DRIVER = 'mysqlimb4';

    /**
     * Open a DB connection
     *
     * @param      string     $host      The host
     * @param      string     $user      The user
     * @param      string     $password  The password
     * @param      string     $database  The database
     *
     * @throws     DatabaseException
     *
     * @return     mixed
     */
    public function db_connect(string $host, string $user, string $password, string $database)
    {
        self::precondition();

        $port   = abs((int) ini_get('mysqli.default_port'));
        $socket = '';
        if (str_contains($host, ':')) {
            // Port or socket given
            $bits   = explode(':', $host);
            $host   = array_shift($bits);
            $socket = array_shift($bits);
            if (abs((int) $socket) > 0) {
                // TCP/IP connection on given port
                $port   = abs((int) $socket);
                $socket = '';
            } else {
                // Socket connection
                $port = 0;
            }
        }

        if (($link = @mysqli_connect($host, $user, $password, $database, $port, $socket)) === false) {
            throw new DatabaseException('Unable to connect to database');
        }

        $this->db_post_connect($link);

        return $link;
    }

    /**
     * Open a persistant DB connection
     *
     * @param      string  $host      The host
     * @param      string  $user      The user
     * @param      string  $password  The password
     * @param      string  $database  The database
     *
     * @return     mixed
     */
    public function db_pconnect(string $host, string $user, string $password, string $database)
    {
        // No pconnect wtih mysqli, below code is for comatibility
        return $this->db_connect($host, $user, $password, $database);
    }

    /**
     * Post connection helper
     *
     * @throws     DatabaseException
     *
     * @param      mysqli  $handle   The DB handle
     */
    private function db_post_connect(mysqli $handle): void
    {
        if (version_compare($this->db_version($handle), '5.7.7', '>=')) {
            $this->db_query($handle, 'SET NAMES utf8mb4');
            $this->db_query($handle, 'SET CHARACTER SET utf8mb4');
            $this->db_query($handle, "SET COLLATION_CONNECTION = 'utf8mb4_unicode_ci'");
            $this->db_query($handle, "SET COLLATION_SERVER = 'utf8mb4_unicode_ci'");
            $this->db_query($handle, "SET CHARACTER_SET_SERVER = 'utf8mb4'");
            if (version_compare($this->db_version($handle), '8.0', '<')) {
                // Setting CHARACTER_SET_DATABASE is obosolete for MySQL 8.0+
                $this->db_query($handle, "SET CHARACTER_SET_DATABASE = 'utf8mb4'");
            }

            $handle->set_charset('utf8mb4');
        } else {
            throw new DatabaseException('Unable to connect to an utf8mb4 database');
        }
    }

    public function orderBy(array|string ...$args): string
    {
        $res     = [];
        $default = [
            'order'   => '',
            'collate' => false,
        ];
        foreach ($args as $v) {
            if (is_string($v)) {
                $res[] = $v;
            } elseif (!empty($v['field'])) {
                $v     = array_merge($default, $v);
                $order = strtoupper($v['order']);
                $order = ($order === 'DESC' ? $order : '');
                $res[] = $v['field'] . ($v['collate'] === true ? ' COLLATE utf8mb4_unicode_ci' : '') . ' ' . $order;
            }
        }

        return $res === [] ? '' : ' ORDER BY ' . implode(',', $res) . ' ';
    }

    /**
     * Get fields concerned by lexical sort
     *
     * @param      array<string>|string  ...$args  The arguments
     */
    public function lexFields(array|string ...$args): string
    {
        $res = [];
        $fmt = '%s COLLATE utf8mb4_unicode_ci';
        foreach ($args as $v) {
            if (is_string($v)) {
                $res[] = sprintf($fmt, $v);
            } else {
                $res = array_map(fn (string $i): string => sprintf($fmt, $i), $v);
            }
        }

        return implode(',', $res);
    }
}
