<?php

namespace App\Http\Middleware;

use App\Domain\Identity\JwtTokenService;
use App\Domain\Identity\RbacService;
use App\Domain\Identity\SessionRepository;
use App\Domain\Identity\UserRepository;
use App\Shared\Http\ApiResponse;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Throwable;

class AuthenticateAccessToken
{
    public function __construct(
        private readonly JwtTokenService $jwt,
        private readonly UserRepository $users,
        private readonly SessionRepository $sessions,
        private readonly RbacService $rbac,
    ) {
    }

    public function handle(Request $request, Closure $next)
    {
        // ── Staging auth bypass ──────────────────────────────────────────────
        // When AUTH_BYPASS=true: if a valid Bearer JWT is present, use real auth
        // so member and admin identities are distinct.  Fall back to the bypass
        // actor (first DB user) when no token is provided or the token cannot be
        // decoded / the sub user cannot be found.
        if (config('app.auth_bypass', false)) {
            $token = $this->extractBearerToken($request);
            if ($token !== null) {
                try {
                    $claims = $this->jwt->decode($token);
                    $userId = (string) ($claims->sub ?? '');
                    if ($userId !== '') {
                        $user = $this->users->findById($userId);
                        if ($user !== null) {
                            $request->attributes->set('actor_user', $user);
                            $request->attributes->set('actor_user_id', $userId);
                            $request->attributes->set('actor_session_id', (string) ($claims->sid ?? 'bypass-jwt'));
                            $request->attributes->set('actor_roles', $this->rbac->rolesForUser($userId));
                            $request->attributes->set('actor_permissions', $this->rbac->permissionsForUser($userId));
                            return $next($request);
                        }
                    }
                } catch (Throwable) {
                    // Invalid JWT — fall through to bypass actor
                }
            }
            $bypass = DB::table('users')->whereNull('deleted_at')->orderBy('id')->first();
            $userId = $bypass !== null ? (string) $bypass->id : 'staging-bypass';
            $request->attributes->set('actor_user', $bypass);
            $request->attributes->set('actor_user_id', $userId);
            $request->attributes->set('actor_session_id', 'bypass');
            $request->attributes->set('actor_roles', $bypass !== null ? $this->rbac->rolesForUser($userId) : ['SUPER_ADMIN']);
            $request->attributes->set('actor_permissions', $bypass !== null ? $this->rbac->permissionsForUser($userId) : ['SUPER_ADMIN_ACCESS']);
            return $next($request);
        }

        $token = $this->extractBearerToken($request);

        if ($token === null) {
            return ApiResponse::error('UNAUTHORIZED', 'Authentication is required.', [], 401);
        }

        try {
            $claims = $this->jwt->decode($token);
        } catch (Throwable) {
            return ApiResponse::error('UNAUTHORIZED', 'Authentication token is invalid or expired.', [], 401);
        }

        $userId = (string) ($claims->sub ?? '');
        $sessionId = (string) ($claims->sid ?? '');
        $user = $this->users->findById($userId);
        $session = $this->sessions->findActiveById($sessionId);

        if ($user === null || $session === null || $session->user_id !== $userId) {
            return ApiResponse::error('UNAUTHORIZED', 'Authentication token is invalid or expired.', [], 401);
        }

        if ($user->disabled_at !== null || $user->user_status === 'DISABLED') {
            return ApiResponse::error('USER_DISABLED', 'This user account is disabled.', [], 403);
        }

        if (in_array(strtoupper((string) ($user->portal_status ?? '')), ['SUSPENDED', 'DISABLED'], true)) {
            return ApiResponse::error('PORTAL_ACCESS_DISABLED', 'This portal account is not active.', [], 403);
        }

        $request->attributes->set('actor_user', $user);
        $request->attributes->set('actor_user_id', $userId);
        $request->attributes->set('actor_session_id', $sessionId);
        $request->attributes->set('actor_roles', $this->rbac->rolesForUser($userId));
        $request->attributes->set('actor_permissions', $this->rbac->permissionsForUser($userId));

        return $next($request);
    }

    private function extractBearerToken(Request $request): ?string
    {
        $candidates = [
            $request->headers->get('X-Authorization'),
            $request->headers->get('Authorization'),
            $request->server('HTTP_X_AUTHORIZATION'),
            $request->server('HTTP_AUTHORIZATION'),
            $request->server('REDIRECT_HTTP_AUTHORIZATION'),
            $request->server('Authorization'),
            $_SERVER['HTTP_X_AUTHORIZATION'] ?? null,
            $_SERVER['HTTP_AUTHORIZATION'] ?? null,
            $_SERVER['REDIRECT_HTTP_AUTHORIZATION'] ?? null,
            $_SERVER['Authorization'] ?? null,
        ];

        if (function_exists('getallheaders')) {
            $headers = getallheaders();
            $candidates[] = $headers['X-Authorization'] ?? $headers['x-authorization'] ?? null;
            $candidates[] = $headers['Authorization'] ?? $headers['authorization'] ?? null;
        }

        if (function_exists('apache_request_headers')) {
            $headers = apache_request_headers();
            $candidates[] = $headers['X-Authorization'] ?? $headers['x-authorization'] ?? null;
            $candidates[] = $headers['Authorization'] ?? $headers['authorization'] ?? null;
        }

        foreach ($candidates as $candidate) {
            $value = trim((string) ($candidate ?? ''));
            if ($value === '') {
                continue;
            }

            if (preg_match('/^Bearer\s+(.+)$/i', $value, $matches) === 1) {
                $token = trim($matches[1]);
                if ($token !== '') {
                    return $token;
                }
            }

            if (preg_match('/^[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_]+$/', $value) === 1) {
                return $value;
            }
        }

        return null;
    }
}