<?php
/*
 * @Author: YwxApp <ywx@ywxapp.cn>
 * @LastEditTime: 2026-09-28 00:00:00
 * @Description: 数据库备份 / 还原 / 优化
 * @FilePath: \ywxapp_dev\app\backend\controller\Database.php
 */

declare(strict_types=1);
namespace app\backend\controller;

use think\facade\Db;
use ywxapp\controller\BackendBase;
use ywxapp\library\DbBackup;

/**
 * 数据库管理
 *
 * 权限节点（首次访问自动补录到 backend_power，挂到「系统管理」下）：
 *   database:index / database:backup / database:recovery / database:delete / database:optimize
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class Database extends BackendBase
{
    use EnsuresPower;   // 权限节点自愈：首次访问自动补录 backend_power

    protected $noNeedLogin = [];
    protected $noNeedVerify = [];

    /**
     * @var DbBackup
     */
    protected $bak;

    /**
     * 进程内只补录一次权限
     * @var bool
     */
    protected static $powerChecked = false;

    protected function initialize()
    {
        $this->bak = new DbBackup();
        if (!self::$powerChecked) {
            self::$powerChecked = true;
            $this->ensureMenus();
        }
    }

    /**
     * 列表：数据表 + 备份记录
     */
    public function index()
    {
        if ($this->request->isAjax()) {
            $type = $this->request->param('type', 'table');

            if ($type === 'backup') {
                $list = $this->bak->backups();
                $this->result->setCount(count($list))->success(array_map(function ($item) {
                    $item['size_text'] = $this->formatBytes($item['size']);
                    $item['time_text'] = date('Y-m-d H:i:s', $item['time']);
                    return $item;
                }, $list));
            }

            $page  = $this->request->param('page/d', 1);
            $limit = $this->request->param('limit/d', 15);
            $kw    = trim((string) $this->request->param('keyword', ''));

            $tables = $this->bak->tables();
            if ($kw !== '') {
                $tables = array_values(array_filter($tables, function ($t) use ($kw) {
                    return stripos($t['name'], $kw) !== false || stripos($t['comment'], $kw) !== false;
                }));
            }
            $total = count($tables);
            $slice = array_slice($tables, ($page - 1) * $limit, $limit);
            foreach ($slice as &$t) {
                $t['size_text'] = $this->formatBytes($t['size']);
            }
            $this->result->setCount($total)->success($slice);
        }

        return $this->fetch();
    }

    /**
     * 备份
     */
    public function backup()
    {
        if (! $this->request->isPost()) {
            $this->result->error('请求方式错误', 405);
        }
        $tables = $this->request->param('tables/a', []);
        $size   = $this->request->param('part_size/d', 2097152);
        $size   = max(65536, min($size, 52428800));  // 64KB ~ 50MB

        set_time_limit(0);
        try {
            $res = $this->bak->backup(array_values(array_filter((array) $tables)), null);
        } catch (\Throwable $e) {
            \think\facade\Log::error('数据库备份失败：' . $e->getMessage());
            $this->result->error('备份失败：' . $e->getMessage());
        }

        $res['size_text'] = $this->formatBytes($res['size']);
        $this->result->success($res, '备份完成：' . $res['tables'] . ' 张表 / ' . $res['rows'] . ' 行');
    }

    /**
     * 还原
     *
     * 注意：基类 BackendBase 已有 restore($ids='')（回收站恢复），此处不能用同名，
     * 否则签名不兼容会直接 500，故命名为 recovery。
     */
    public function recovery()
    {
        if (! $this->request->isPost()) {
            $this->result->error('请求方式错误', 405);
        }
        $name = (string) $this->request->param('name', '');
        if ($name === '') {
            $this->result->error('请选择备份');
        }

        set_time_limit(0);
        try {
            $res = $this->bak->restore($name);
        } catch (\Throwable $e) {
            \think\facade\Log::error('数据库还原失败：' . $e->getMessage());
            $this->result->error('还原失败：' . $e->getMessage());
        }
        $this->result->success($res, '还原完成：' . $res['files'] . ' 个文件 / ' . $res['sql'] . ' 条语句');
    }

    /**
     * 删除备份
     */
    public function delete()
    {
        if (! $this->request->isPost()) {
            $this->result->error('请求方式错误', 405);
        }
        $name = (string) $this->request->param('name', '');
        if ($name === '') {
            $this->result->error('请选择备份');
        }
        $this->result->success(['ok' => $this->bak->delete($name)], '已删除');
    }

    /**
     * 下载备份文件
     */
    public function download()
    {
        $name = (string) $this->request->param('name', '');
        $file = (string) $this->request->param('file', '');
        $path = $this->bak->fileOf($name, $file);
        if (! $path || ! is_file($path)) {
            $this->result->error('备份文件不存在', 404);
        }

        return response(file_get_contents($path), 200, [
            'Content-Type'        => 'application/octet-stream',
            'Content-Disposition' => 'attachment; filename="' . basename($path) . '"',
            'Content-Length'      => filesize($path),
        ]);
    }

    /**
     * 优化表
     */
    public function optimize()
    {
        if (! $this->request->isPost()) {
            $this->result->error('请求方式错误', 405);
        }
        $tables = array_values(array_filter((array) $this->request->param('tables/a', [])));
        if (! $tables) {
            $this->result->error('请选择要优化的表');
        }
        $res = $this->bak->optimize($tables);
        $this->result->success($res, '已优化 ' . count($res) . ' 张表');
    }

    /**
     * 权限节点补录：核心后台菜单即权限记录，缺失时自动补上，
     * 避免手工在「权限菜单」里一条条加。
     */
    protected function formatBytes(int $bytes): string
    {
        if ($bytes <= 0) {
            return '0 B';
        }
        $units = ['B', 'KB', 'MB', 'GB'];
        $i     = (int) min(count($units) - 1, floor(log($bytes, 1024)));
        return round($bytes / (1024 ** $i), 2) . ' ' . $units[$i];
    }
}