<?php
namespace App\Console\Commands;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use App\Models\Dialogue;
use App\Models\Message;
use App\Services\SupplyDemand\Conversations;
class SupplyDemandConversations extends Command {
    protected $signature='supply-demand:normalize-conversations {--apply : 写入历史会话关联，否则仅预览}';
    protected $description='按需求和双方身份整理已有消息，不猜测缺失的供需关联';
    public function handle() {
        $count=0;
        Message::orderBy('id')->chunkById(200,function($rows) use(&$count) {
            foreach($rows as $m) {
                $key=Conversations::key($m->supply_demand_id,$m->user_id,$m->to_user_id);
                $old=Dialogue::find($m->dialogue_id);
                if($old && $old->conversation_key===$key) continue;
                $count++;
                if(!$this->option('apply')) continue;
                DB::transaction(function() use($m,$key) {
                    $c=Dialogue::firstOrCreate(['conversation_key'=>$key],['user_id'=>$m->user_id,'to_user_id'=>$m->to_user_id,'supply_demand_id'=>$m->supply_demand_id?:null]);
                    $m->dialogue_id=$c->id; $m->save();
                    if(!$c->last_datetime || (string)$m->created_at >= $c->last_datetime) { $c->last_content=$m->content;$c->last_datetime=$m->created_at->format('Y-m-d H:i:s');$c->save(); }
                });
            }
        });
        $this->info(($this->option('apply')?'已整理':'待整理').'消息 '.$count.' 条。缺失供需ID的历史消息保持普通对话。'); return 0;
    }
}