<?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;

/**
 * OTA 固件升级服务
 *
 * 流程：
 *   后台/App 上传固件 → 计算 SHA256/大小 → 存 iot_ota
 *   → publishOta 选中设备 → 下发 /devices/{uuid}/ota 指令
 *   → 设备下载/校验/升级 → 上报 /devices/{uuid}/ota/report 进度
 *   → onReport 解析进度，写 device_log + 失败告警/通知
 *
 * 升级指令 payload：
 *   {"version":"1.2.0","url":"https://...","hash":"sha256","size":12345}
 */
class OtaService
{
    /** OTA 下发主题 */
    public const TOPIC_OTA = '/devices/%s/ota';
    /** OTA 进度上报主题 */
    public const TOPIC_REPORT = '/devices/%s/ota/report';

    /** 确保 ota 表存在（自愈） */
    public static function ensureTable(): bool
    {
        $prefix = Db::connect()->getConfig('prefix') ?: 'wxapp_';
        try {
            Db::execute("CREATE TABLE IF NOT EXISTS `{$prefix}iot_ota` (
                `id` int unsigned NOT NULL AUTO_INCREMENT,
                `model` varchar(64) NOT NULL DEFAULT '',
                `version` varchar(32) NOT NULL DEFAULT '', `filename` varchar(128) NOT NULL DEFAULT '',
                `file_hash` varchar(64) NOT NULL DEFAULT '', `size` int unsigned NOT NULL DEFAULT '0',
                `url` varchar(255) NOT NULL DEFAULT '', `remark` varchar(255) DEFAULT NULL,
                `status` tinyint(1) NOT NULL DEFAULT '1',
                `create_at` int DEFAULT NULL,
                PRIMARY KEY (`id`), KEY `idx_model` (`model`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
            return true;
        } catch (\Throwable $e) {
            return false;
        }
    }

    /**
     * 登记固件（后台上传后调用）
     * @return int OTA记录ID
     */
    public static function add(array $data): int
    {
        self::ensureTable();
        $version = trim((string) ($data['version'] ?? ''));
        if ($version === '') {
            throw new \InvalidArgumentException('版本号不能为空');
        }
        $file = trim((string) ($data['filename'] ?? ''));
        $url  = trim((string) ($data['url'] ?? ''));
        $hash = trim((string) ($data['file_hash'] ?? ''));
        $size = max(0, (int) ($data['size'] ?? 0));
        if ($file === '' || $url === '') {
            throw new \InvalidArgumentException('固件文件与下载地址不能为空');
        }
        // 校验哈希格式（SHA256 为 64 位 hex；允许手动录入，上传时自动计算）
        if ($hash !== '' && !preg_match('/^[a-f0-9]{64}$/i', $hash)) {
            throw new \InvalidArgumentException('文件哈希须为 SHA256（64位hex）');
        }
        return (int) Db::name('iot_ota')->insertGetId([
            'model'     => mb_substr(trim((string) ($data['model'] ?? '')), 0, 64),
            'version'   => mb_substr($version, 0, 32),
            'filename'  => mb_substr($file, 0, 128),
            'file_hash' => strtolower($hash),
            'size'      => $size,
            'url'       => mb_substr($url, 0, 255),
            'remark'    => mb_substr((string) ($data['remark'] ?? ''), 0, 255),
            'status'    => isset($data['status']) && !$data['status'] ? 0 : 1,
            'create_at' => time(),
        ]);
    }

    /** 固件列表（按型号过滤） */
    public static function list(string $model = ''): array
    {
        self::ensureTable();
        $q = Db::name('iot_ota');
        if ($model !== '') {
            $q->where('model', $model);
        }
        return $q->order('id', 'desc')->select()->toArray();
    }

    /** 删除固件 */
    public static function remove(int $otaId): void
    {
        Db::name('iot_ota')->where('id', $otaId)->delete();
    }

    /**
     * 下发升级指令到指定设备（逐个 outbox 入队，离线自动补发）
     * @return int 成功入队数
     */
    public static function publish(int $otaId, array $deviceUuids): int
    {
        $ota = Db::name('iot_ota')->where('id', $otaId)->find();
        if (!$ota || !$ota['status']) {
            throw new \RuntimeException('固件不存在或已停用');
        }
        $payload = (string) json_encode([
            'version' => $ota['version'],
            'url'     => $ota['url'],
            'hash'    => $ota['file_hash'],
            'size'    => (int) $ota['size'],
        ], JSON_UNESCAPED_SLASHES);
        $ok = 0;
        foreach (array_unique($deviceUuids) as $uuid) {
            if ($uuid === '') {
                continue;
            }
            if (Store::enqueueManual(sprintf(self::TOPIC_OTA, $uuid), $payload, 1, 0, 'ota')) {
                $ok++;
            }
        }
        return $ok;
    }

    /**
     * 设备 OTA 进度上报处理（Broker 钩子 /ota/report 调用）
     * payload: {"state":"downloading|installing|done|fail","progress":42,"version":"1.2.0"}
     */
    public static function onReport(string $uuid, string $payload): void
    {
        DeviceLogService::log(sprintf(self::TOPIC_REPORT, $uuid), $payload, 'in');
        $data = json_decode($payload, true);
        if (!is_array($data)) {
            return;
        }
        $state = (string) ($data['state'] ?? '');
        $dev = DeviceService::findByUuid($uuid);
        if (!$dev || (int) $dev['member_id'] <= 0) {
            return;
        }
        $memberId = (int) $dev['member_id'];
        $version  = (string) ($data['version'] ?? '');
        switch ($state) {
            case 'done':
                AlertService::add($memberId, 'ota', 1, '固件升级完成',
                    '设备「' . $dev['title'] . '」已升级到 ' . $version, $uuid);
                break;
            case 'fail':
                AlertService::add($memberId, 'ota', 3, '固件升级失败',
                    '设备「' . $dev['title'] . '」升级失败：' . mb_substr((string) ($data['error'] ?? '未知原因'), 0, 200), $uuid);
                break;
            default:
                // downloading/installing 进度 → 实时通知（不写告警表，避免刷屏）
                AlertService::push($memberId, 'ota', (string) json_encode([
                    'type'     => 'progress',
                    'uuid'     => $uuid,
                    'state'    => $state,
                    'progress' => (int) ($data['progress'] ?? -1),
                    'version'  => $version,
                    'time'     => time(),
                ]));
                break;
        }
    }
}