// server/plugins/alb-timeout-handler.ts
export default defineNitroPlugin((nitroApp) => {
  // If ALB timeout is 60s, set app timeout to 58s
  const ALB_TIMEOUT = 60000
  const APP_TIMEOUT = ALB_TIMEOUT - 2000 // 2s buffer
  
  nitroApp.hooks.hook('request', async (event) => {
    const timeout = setTimeout(() => {
      // Check if response was already sent
      if (!event.node.res.headersSent) {
        // Send response BEFORE ALB times out
        event.node.res.statusCode = 503
        event.node.res.end(JSON.stringify({
          error: 'Request timeout - processing took too long'
        }))
      }
      
      // Clean up any ongoing operations
      event.context.abortController?.abort()
    }, APP_TIMEOUT)
    
    // Clear timeout on response
    event.node.res.on('finish', () => clearTimeout(timeout))
    
    // Store abort controller in context for cleanup
    event.context.abortController = new AbortController()
  })
})