<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Http\Requests\Auth\LoginRequest;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Route;
use Illuminate\Support\Str;
use Inertia\Inertia;
use Inertia\Response;
use Symfony\Component\HttpFoundation\Response as SymfonyResponse;

class AuthenticatedSessionController extends Controller
{
    /**
     * Show the login page.
     */
    public function create(Request $request): Response
    {
        return Inertia::render('auth/login', [
            'canResetPassword' => Route::has('password.request'),
            'status' => $request->session()->get('status'),
        ]);
    }

    /**
     * Handle an incoming authentication request.
     */
    public function store(LoginRequest $request): SymfonyResponse
    {
        try {
            $request->authenticate();
        } catch (\Illuminate\Validation\ValidationException $e) {
            $request->session()->flash('error', __('auth.login_failed'));

            return redirect()->route('login')->withErrors($e->errors());
        }

        Log::info('Login attempt', ['login' => $request->login, 'authenticated' => Auth::check()]);

        $request->session()->regenerate();
        $request->session()->flash('success', __('auth.login_success'));

        $user = Auth::user();
        if ($user && $user->email_verified_at === null) {
            return Inertia::location(route('verification.notice'));
        }

        $returnTo = $this->resolveReturnTo($request);
        if ($returnTo !== null) {
            return Inertia::location($returnTo);
        }

        return Inertia::location($this->defaultAdminPath());
    }

    /**
     * Destroy an authenticated session.
     */
    public function destroy(Request $request): RedirectResponse
    {
        Auth::guard('web')->logout();

        $request->session()->invalidate();
        $request->session()->regenerateToken();

        return redirect('/');
    }

    private function resolveReturnTo(Request $request): ?string
    {
        $encoded = $request->string('return_to')->trim();

        if ($encoded === '') {
            return null;
        }

        return $this->decodeReturnTo($encoded, $request);
    }

    private function decodeReturnTo(string $value, Request $request): ?string
    {
        $candidate = $this->decodeBase64Url($value) ?? $value;
        $candidate = trim($candidate);

        if ($candidate === '') {
            return null;
        }

        if (str_starts_with($candidate, '/')) {
            return $candidate;
        }

        $targetHost = parse_url($candidate, PHP_URL_HOST);
        $scheme = parse_url($candidate, PHP_URL_SCHEME);

        if (! $scheme || ! $targetHost) {
            return null;
        }

        $appHost = parse_url($request->getSchemeAndHttpHost(), PHP_URL_HOST);

        if ($appHost && ! Str::endsWith($targetHost, $appHost)) {
            return null;
        }

        return $candidate;
    }

    private function defaultAdminPath(): string
    {
        $base = rtrim(route('tenant.admin.app', absolute: false), '/');
        if ($base === '') {
            $base = '/event-admin';
        }

        return $base.'/events';
    }

    private function decodeBase64Url(string $value): ?string
    {
        if ($value === '') {
            return null;
        }

        $padded = str_pad($value, strlen($value) + ((4 - (strlen($value) % 4)) % 4), '=');
        $normalized = strtr($padded, '-_', '+/');
        $decoded = base64_decode($normalized, true);

        if ($decoded === false) {
            return null;
        }

        return $decoded;
    }
}