import type { NextFunction, Request, Response } from 'express'
import jwt, { type JwtPayload } from 'jsonwebtoken'

export type OsintClaims = JwtPayload & { role?: string; isAdmin?: boolean }

declare global {
  namespace Express {
    interface Request { authClaims?: OsintClaims }
  }
}

export function authenticateJwt(req: Request, _res: Response, next: NextFunction) {
  const authorization = req.headers.authorization
  const token = req.cookies?.auth_token || (authorization?.startsWith('Bearer ') ? authorization.slice(7) : undefined)
  const secret = process.env.JWT_SECRET
  if (token && secret) {
    try {
      const decoded = jwt.verify(token, secret)
      if (typeof decoded !== 'string') req.authClaims = decoded as OsintClaims
    } catch { /* An absent, expired, or invalid cookie is an anonymous session. */ }
  }
  next()
}

export function hasAdminClaim(req: Request) {
  return req.authClaims?.role === 'admin' || req.authClaims?.isAdmin === true
}

export function requireAdmin(req: Request, res: Response, next: NextFunction) {
  if (!hasAdminClaim(req)) return res.status(403).json({ error: 'Administrator claim required' })
  next()
}

export function createDevelopmentAdminToken() {
  if (process.env.NODE_ENV === 'production') throw new Error('Development sessions are disabled in production')
  if (!process.env.JWT_SECRET) throw new Error('JWT_SECRET is required')
  return jwt.sign({ sub: 'osint-local-admin', role: 'admin', isAdmin: true }, process.env.JWT_SECRET, { expiresIn: '7d' })
}