<?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\wxchat\worker\handle;

use addon\wxchat\model\WxchatMessage;
use addon\wxchat\model\WxchatUnreadCount;
use addon\wxchat\service\SafetyService;
use addon\wxchat\worker\enum\MsgFrame;
use addon\wxchat\worker\enum\MsgType;
use addon\wxchat\worker\Message;
use addon\wxchat\worker\MsgReply;
use GatewayWorker\Lib\Gateway;

/**
 * 聊天消息处理（实时落库 + 转发 + ACK）
 *
 * 协议约定（客户端上行）：
 * {
 *   "header":  { "type":"chat", "target":"single"|"group", "timestamp":... },
 *   "payload": { "uid":123, "receiver":456, "session_id":789, "type":"text"|"image"|"voice"|"video"|"file"|"gift", "content":"...", "ext":{} }
 * }
 */
class ChatHandle
{
    // 内容类型字符串 -> 数据库 content_type(int)
    private const CONTENT_TYPE_MAP = [
        'text'  => 0,
        'image' => 1,
        'voice' => 2,
        'video' => 3,
        'file'  => 4,
        'gift'  => 5,
    ];

    
    public static function handle($client_id, $header, $payload)
    {
        $uid = Gateway::getUidByClientId($client_id);
        if (empty($uid)) {
            MsgReply::sendError($client_id, '未认证，请先登录');
            return;
        }
        $payloadUid = (int)($payload->uid ?? 0);
        if ($payloadUid && $payloadUid != $uid) {
            MsgReply::sendError($client_id, '身份不一致');
            return;
        }

        $contentType = (string)($payload->type ?? 'text');
        if (! isset(self::CONTENT_TYPE_MAP[$contentType])) {
            MsgReply::sendError($client_id, '不支持的消息类型: ' . $contentType);
            return;
        }

        // 礼物消息：仅做实时通知，落库由 HTTP Gift::send 负责
        if ($contentType === 'gift') {
            self::relayGift($client_id, $uid, $payload);
            return;
        }

        $target       = (string)($header->target ?? 'single');
        $receiverType = ($target === 'group') ? 1 : 0;
        $receiverId   = (int)($target === 'group'
            ? ($payload->session_id ?? 0)
            : ($payload->receiver ?? 0));

        if (! $receiverId) {
            MsgReply::sendError($client_id, '接收者无效');
            return;
        }

        $content = $payload->content ?? '';
        // 文本类消息做敏感词过滤
        if ($contentType === 'text') {
            $content = SafetyService::instance()->filter($content);
        }

        $msgId = self::saveMessage($uid, $receiverType, $receiverId, self::CONTENT_TYPE_MAP[$contentType], $content);

        // 单聊：对方未读 +1
        if ($receiverType == 0) {
            WxchatUnreadCount::increment($receiverId, 0, $uid);
        }

        // 构造下发消息并转发
        $out = self::buildOutbound($msgId, $uid, $contentType, $content, $payload);
        if ($receiverType == 0) {
            if (Gateway::isUidOnline($receiverId)) {
                Gateway::sendToUid($receiverId, json_encode($out));
            }
            // 离线：消息已落库，接收方下次拉取 history 获取
        } else {
            Gateway::sendToGroup((string)$receiverId, json_encode($out));
        }

        // 发送方回执
        MsgReply::send($client_id, MsgFrame::STATUS->value, MsgType::DELIVERED->value, 'delivered', [
            'msg_id'     => $msgId,
            'receiver'   => $receiverId,
            'session_id' => $receiverId,
        ]);
    }

    /**
     * 消息落库（可被 HTTP / WebSocket 共用，返回消息ID）
     */
    public static function saveMessage($senderId, $receiverType, $receiverId, $contentType, $content)
    {
        $msg                  = new WxchatMessage();
        $msg->sender_id       = $senderId;
        $msg->receiver_type   = $receiverType;
        $msg->receiver_id     = $receiverId;
        $msg->content         = $content;
        $msg->content_type    = $contentType;
        $msg->save();
        return $msg->id;
    }

    
    private static function buildOutbound($msgId, $senderId, $contentType, $content, $payload)
    {
        $out = new Message();
        $out->header->frame = MsgFrame::CHAT->value;
        $out->header->type  = MsgFrame::CHAT->value;
        $out->payload->msg_id     = $msgId;
        $out->payload->uid        = $senderId;
        $out->payload->type       = $contentType; // 文本类为字符串，媒体类为URL
        $out->payload->content    = $content;
        $out->payload->receiver   = $payload->receiver ?? 0;
        $out->payload->session_id = $payload->session_id ?? 0;
        $out->payload->status     = 'delivered';
        if (! empty($payload->ext)) {
            $out->payload->ext = $payload->ext;
        }
        return $out;
    }

    
    private static function relayGift($client_id, $uid, $payload)
    {
        $receiver = (int)($payload->receiver ?? 0);
        if (! $receiver) {
            MsgReply::sendError($client_id, '礼物接收者无效');
            return;
        }
        $out = new Message();
        $out->header->frame = MsgFrame::CHAT->value;
        $out->header->type  = 'gift';
        $out->payload->uid      = $uid;
        $out->payload->receiver = $receiver;
        $out->payload->content  = $payload->content ?? '';
        $out->payload->ext      = $payload->ext ?? null;
        if (Gateway::isUidOnline($receiver)) {
            Gateway::sendToUid($receiver, json_encode($out));
        }
        MsgReply::send($client_id, MsgFrame::STATUS->value, MsgType::DELIVERED->value, 'delivered', [
            'receiver' => $receiver,
        ]);
    }
}