<?php

namespace App\Http\Controllers;

use App\Helpers\ProfileAuthorizationHelper;
use App\Models\Admin;
use App\Models\Bank;
use App\Models\Poll;
use App\Polls\ResultsCsv;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Gate;
use Illuminate\Support\Facades\Log;

/**
 * Poll results as a CSV download. A plain HTTP route (not a Livewire action) so the file is
 * streamed instead of buffered in memory.
 */
class PollResultsExportController extends Controller
{
    public function __invoke(Poll $poll)
    {
        // Admin (or central bank) profile allowed to see who voted
        $profile = getActiveProfile();
        if (!$profile || !($profile instanceof Admin || ($profile instanceof Bank && $profile->level === 0))) {
            abort(403);
        }
        ProfileAuthorizationHelper::authorize($profile);
        if (!Gate::allows('export polls')) {
            abort(403);
        }

        Log::info('Poll results exported', ['poll_id' => $poll->id, 'user_id' => auth('web')->id()]);

        $csv = new ResultsCsv($poll, App::getLocale());
        $filename = 'poll-' . $poll->id . '-results-' . now()->format('Y-m-d') . '.csv';

        return response()->streamDownload(function () use ($csv) {
            $out = fopen('php://output', 'w');
            fwrite($out, "\xEF\xBB\xBF"); // UTF-8 BOM, so Excel shows accents correctly
            fputcsv($out, $csv->header());
            foreach ($csv->rows() as $row) {
                fputcsv($out, $row);
            }
            fclose($out);
        }, $filename, ['Content-Type' => 'text/csv; charset=UTF-8']);
    }
}