<?php

declare(strict_types=1);

namespace App\Providers;

use App\Auth\PireonTokenGuard;
use App\Services\Git\GitManager;
use App\Services\Pireon\PireonClient;
use App\Services\Pireon\TokenStore;
use Illuminate\Auth\Events\Logout;
use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\Facades\URL;
use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Str;

class AppServiceProvider extends ServiceProvider
{
    public function register(): void
    {
        $this->app->singleton(PireonClient::class, fn () => PireonClient::fromConfig());

        $this->app->scoped(TokenStore::class, fn ($app) => new TokenStore(
            $app['session.store'],
            $app->make(PireonClient::class),
        ));

        // Resolves git hosting drivers; see config/git.php.
        $this->app->singleton(GitManager::class);
    }

    public function boot(): void
    {
        // Backs the "api" guard declared in config/auth.php.
        Auth::viaRequest('pireon', fn (Request $request) => $this->app
            ->make(PireonTokenGuard::class)($request));

        // Drop the OAuth token set whenever a session ends, no matter which
        // route did it — ours, or Filament's own logout button.
        Event::listen(Logout::class, function (): void {
            if ($this->app->bound('session') && $this->app['session']->isStarted()) {
                $this->app->make(TokenStore::class)->forget();
            }
        });

        // Backs `throttle:api` on the REST routes. Authenticated callers are
        // budgeted per user so one noisy client cannot exhaust the allowance
        // of everyone sharing an IP.
        RateLimiter::for('api', fn (Request $request) => Limit::perMinute(120)
            ->by($request->user()?->id ?: $request->ip()));

        // The public API is a different problem. The public frontend renders
        // server-side, so every visitor's page view arrives from the same IP:
        // a per-IP budget sized for one person would throttle the entire
        // website as though it were a single abusive client. Hence a generous
        // limit, and an explicit bypass for the frontend's own address.
        RateLimiter::for('public-api', function (Request $request) {
            if (in_array($request->ip(), (array) config('site.trusted_ips'), true)) {
                return Limit::none();
            }

            return Limit::perMinute((int) config('site.rate_limit', 600))->by($request->ip());
        });

        // Submissions are the opposite problem again. Reads are throttled per
        // IP; writes cannot be, because SSR means every submission on the site
        // arrives from the frontend's single address — which is in
        // `trusted_ips` and would bypass the limit anyway.
        //
        // So the budget is spent per e-mail address, with a site-wide hourly
        // ceiling behind it as the actual protection against a flood.
        RateLimiter::for('public-write', fn (Request $request) => [
            Limit::perMinute((int) config('site.submissions.rate_limit', 3))
                ->by('submission:'.sha1(Str::lower((string) $request->input('email')))),

            Limit::perHour((int) config('site.submissions.hourly_limit', 60))
                ->by('submissions'),
        ]);

        // Telemetry is a third case again. It is one server reporting to
        // another, authenticated by a shared secret, so the address it comes
        // from is stable and a per-IP budget means what it says — unlike the
        // submissions, where the same address stands for every visitor.
        //
        // Trusted IPs deliberately do *not* bypass this one: the frontend is
        // the only caller there will ever be, so an exemption would leave the
        // endpoint with no ceiling at all.
        RateLimiter::for('public-telemetry', fn (Request $request) => Limit::perMinute(
            (int) config('site.telemetry.rate_limit', 60)
        )->by($request->ip()));

        // Fail loudly in development when a relation is used without being
        // loaded, or a non-fillable attribute is assigned.
        Model::shouldBeStrict($this->app->isLocal());
        Model::unguard(false);

        // The OAuth redirect URI is registered as https on the identity
        // server, so generated URLs must match it in deployed environments.
        if ($this->app->environment('production') || str_starts_with((string) config('app.url'), 'https://')) {
            URL::forceScheme('https');
        }
    }
}