<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------

declare(strict_types=1);

namespace addon\iot\service;

use think\facade\Db;

/**
 * 设备分组服务（智慧生活：房间/自定义分组）
 *
 * 权限模型：
 *   - member_id=0 → 后台全局分组（所有会员可见）
 *   - member_id>0 → 仅归属会员可见/可管理
 */
class GroupService
{
    /** 确保分组表存在（自愈） */
    public static function ensureTables(): bool
    {
        $prefix = Db::connect()->getConfig('prefix') ?: 'wxapp_';
        try {
            Db::execute("CREATE TABLE IF NOT EXISTS `{$prefix}iot_group` (
                `id` int unsigned NOT NULL AUTO_INCREMENT,
                `member_id` int unsigned NOT NULL DEFAULT '0',
                `title` varchar(64) NOT NULL DEFAULT '', `type` varchar(16) NOT NULL DEFAULT 'room',
                `sort` int NOT NULL DEFAULT '0',
                `create_at` int DEFAULT NULL, `update_at` int DEFAULT NULL,
                PRIMARY KEY (`id`), KEY `idx_member` (`member_id`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
            Db::execute("CREATE TABLE IF NOT EXISTS `{$prefix}iot_group_device` (
                `id` int unsigned NOT NULL AUTO_INCREMENT,
                `group_id` int unsigned NOT NULL DEFAULT '0',
                `device_id` int unsigned NOT NULL DEFAULT '0',
                `create_at` int DEFAULT NULL,
                PRIMARY KEY (`id`), UNIQUE KEY `uk_group_device` (`group_id`,`device_id`),
                KEY `idx_device` (`device_id`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
            return true;
        } catch (\Throwable $e) {
            return false;
        }
    }

    /** 校验分组归属（memberId>0 时仅自己；0 可见全局+自己） */
    protected static function checkOwner(int $groupId, int $memberId): void
    {
        $g = Db::name('iot_group')->where('id', $groupId)->find();
        if (!$g) {
            throw new \RuntimeException('分组不存在');
        }
        if ($memberId > 0 && (int) $g['member_id'] !== $memberId && (int) $g['member_id'] !== 0) {
            throw new \RuntimeException('无权操作该分组');
        }
    }

    /**
     * 创建/编辑分组
     * @return int 分组ID
     */
    public static function save(array $data): int
    {
        self::ensureTables();
        $id    = (int) ($data['id'] ?? 0);
        $title = mb_substr(trim((string) ($data['title'] ?? '')), 0, 64);
        if ($title === '') {
            throw new \InvalidArgumentException('分组名不能为空');
        }
        $now = time();
        $row = [
            'member_id' => (int) ($data['member_id'] ?? 0),
            'title'     => $title,
            'type'      => ($data['type'] ?? 'room') === 'custom' ? 'custom' : 'room',
            'sort'      => max(0, (int) ($data['sort'] ?? 0)),
            'update_at' => $now,
        ];
        if ($id > 0) {
            self::checkOwner($id, $row['member_id']);
            Db::name('iot_group')->where('id', $id)->update($row);
        } else {
            $row['create_at'] = $now;
            $id = (int) Db::name('iot_group')->insertGetId($row);
        }
        return $id;
    }

    /** 删除分组（连带关联） */
    public static function remove(int $groupId, int $memberId = 0): void
    {
        self::checkOwner($groupId, $memberId);
        Db::name('iot_group')->where('id', $groupId)->delete();
        Db::name('iot_group_device')->where('group_id', $groupId)->delete();
    }

    /** 分组列表（会员可见：全局 + 自己的），带设备数与在线数 */
    public static function groups(int $memberId = 0): array
    {
        self::ensureTables();
        $q = Db::name('iot_group');
        if ($memberId > 0) {
            $q->where('member_id', 0)->whereOr('member_id', $memberId);
        }
        $rows = $q->order('sort', 'asc')->order('id', 'asc')->select()->toArray();
        foreach ($rows as &$g) {
            $deviceIds = Db::name('iot_group_device')->where('group_id', $g['id'])->column('device_id');
            $g['device_count'] = count($deviceIds);
            $g['online_count'] = 0;
            if ($deviceIds) {
                $uuids = Db::name('iot_device')->whereIn('id', $deviceIds)->column('uuid');
                foreach ($uuids as $u) {
                    if (DeviceService::isOnline($u)) {
                        $g['online_count']++;
                    }
                }
            }
        }
        return $rows;
    }

    /** 设备加入分组（幂等） */
    public static function addDevice(int $groupId, int $deviceId, int $memberId = 0): void
    {
        self::checkOwner($groupId, $memberId);
        $exists = Db::name('iot_group_device')
            ->where('group_id', $groupId)->where('device_id', $deviceId)->count();
        if ($exists > 0) {
            return;
        }
        Db::name('iot_group_device')->insert([
            'group_id' => $groupId, 'device_id' => $deviceId, 'create_at' => time(),
        ]);
    }

    /** 设备移出分组 */
    public static function removeDevice(int $groupId, int $deviceId, int $memberId = 0): void
    {
        self::checkOwner($groupId, $memberId);
        Db::name('iot_group_device')
            ->where('group_id', $groupId)->where('device_id', $deviceId)->delete();
    }

    /** 组内设备（含在线/影子增强字段） */
    public static function devicesByGroup(int $groupId, int $memberId = 0): array
    {
        self::checkOwner($groupId, $memberId);
        $deviceIds = Db::name('iot_group_device')->where('group_id', $groupId)->column('device_id');
        if (!$deviceIds) {
            return ['list' => [], 'total' => 0];
        }
        $devices = Db::name('iot_device')->whereIn('id', $deviceIds)->select()->toArray();
        foreach ($devices as &$d) {
            $d['online'] = DeviceService::isOnline($d['uuid']);
            $shadow = DeviceService::shadow($d['uuid']);
            $d['shadow'] = $shadow ? $shadow['payload'] : '';
        }
        return ['list' => $devices, 'total' => count($devices)];
    }

    /** 设备所在分组（供设备详情展示） */
    public static function groupsOfDevice(int $deviceId): array
    {
        $gids = Db::name('iot_group_device')->where('device_id', $deviceId)->column('group_id');
        if (!$gids) {
            return [];
        }
        return Db::name('iot_group')->whereIn('id', $gids)->column('title');
    }

    /** 解绑/删除设备时清关联 */
    public static function clearDevice(int $deviceId): void
    {
        Db::name('iot_group_device')->where('device_id', $deviceId)->delete();
    }
}