<?php

namespace App\Services;

use App\Models\InvestmentItem;
use App\Models\Opportunity;
use Illuminate\Support\Facades\DB;

final class InvestmentIdentity
{
    public function forOpportunity(int $id): string
    {
        return DB::transaction(function () use ($id) {
            $opportunity = Opportunity::whereKey($id)->lockForUpdate()->firstOrFail();
            $mapping = DB::table('investment_item_opportunities')->where('opportunity_id', $id)->first();
            if ($mapping) {
                return $mapping->item_id;
            }
            $item = InvestmentItem::create(['code' => 'opportunity:'.$id, 'title' => $opportunity->title, 'kind' => 'opportunity']);
            DB::table('investment_item_opportunities')->insert(['item_id' => $item->id, 'opportunity_id' => $id,
                'mapping_evidence' => 'Direct correspondence to existing opportunity primary key; no inferred merge or change of validation status.',
                'created_at' => now(), 'updated_at' => now()]);

            return $item->id;
        });
    }
}