<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Signature\SignatureBuilder;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class SignatureController extends Controller
{
    /**
     * GET /api/v1/signature?context=new|reply|forward|appointment&mailbox=adresse
     * Réponse : { html, variant, template, generated_at }
     */
    public function show(Request $request, SignatureBuilder $builder): JsonResponse
    {
        $data = $request->validate([
            'context' => ['sometimes', 'in:new,reply,forward,appointment'],
            'mailbox' => ['sometimes', 'nullable', 'email:rfc', 'max:254'],
        ]);

        $result = $builder->build(
            $request->attributes->get('directory_user'),
            $data['context'] ?? 'new',
            $data['mailbox'] ?? null,
        );

        if ($result === null) {
            return response()->json(['error' => 'no_template'], 404);
        }

        return response()->json($result + ['generated_at' => now()->toIso8601String()])
            ->header('Cache-Control', 'private, no-store');
    }
}