import session from 'express-session'
import { RedisStore } from 'connect-redis'
import { redisClient } from './redis'

// Extend the session interface to include our custom properties
declare module 'express-session' {
  interface SessionData {
    userId?: string
    user?: {
      id: string
      email: string
      name: string
      role: string
      avatar?: string
    }
    accessToken?: string
    refreshToken?: string
  }
}

// Create session config - use Redis if available, otherwise use memory store
const createSessionConfig = () => {
  const baseConfig = {
    secret: process.env.SESSION_SECRET || 'your-super-secret-session-key-change-in-production',
    resave: false,
    saveUninitialized: false,
    rolling: true, // Reset expiry on each request
    cookie: {
      secure: process.env.NODE_ENV === 'production', // HTTPS only in production
      httpOnly: true,
      maxAge: 24 * 60 * 60 * 1000, // 24 hours
      sameSite: 'lax' as const,
    },
    name: 'sessionId', // Don't use default session name
  }

  // Only use Redis store if Redis client is available
  if (redisClient) {
    console.log('Using Redis store for sessions')
    return {
      ...baseConfig,
      store: new RedisStore({
        client: redisClient,
        prefix: 'sess:',
      }),
    }
  } else {
    console.warn('Using memory store for sessions - sessions will not persist across server restarts')
    return baseConfig
  }
}

export const sessionConfig = createSessionConfig()

export const sessionMiddleware = session(sessionConfig)