import { mkdir } from 'fs/promises'
import { existsSync } from 'fs'
import { join } from 'path'
import { keycloakClient } from '~/server/utils/keycloak-client'

let isAppReady = false

export default defineNitroPlugin(async (nitroApp) => {
  console.log('[STARTUP] Server-side initialization starting...')
  
  try {
    // Ensure data directories exist
    const dataDir = './data'
    const oidcSessionsDir = './data/oidc-sessions'
    const sessionsDir = './data/sessions'
    
    console.log('[STARTUP] Checking storage directories...')
    
    // Create directories if they don't exist
    const dirs = [dataDir, oidcSessionsDir, sessionsDir]
    for (const dir of dirs) {
      if (!existsSync(dir)) {
        console.log(`[STARTUP] Creating directory: ${dir}`)
        await mkdir(dir, { recursive: true })
        console.log(`[STARTUP] Successfully created: ${dir}`)
      } else {
        console.log(`[STARTUP] Directory exists: ${dir}`)
      }
    }
    
    // Check environment variables
    console.log('[STARTUP] Checking authentication environment variables...')
    const requiredEnvVars = [
      'KEYCLOAK_CLIENT_SECRET',
      'COOKIE_DOMAIN'
    ]
    
    let envVarsOk = true
    for (const envVar of requiredEnvVars) {
      const value = process.env[envVar]
      if (value) {
        console.log(`[STARTUP] ✅ ${envVar}: present (length: ${value.length})`)
      } else {
        console.error(`[STARTUP] ❌ ${envVar}: MISSING`)
        envVarsOk = false
      }
    }
    
    if (!envVarsOk) {
      console.error('[STARTUP] ❌ Required environment variables missing - authentication may fail')
    }
    
    // Warm up Keycloak connections
    console.log('[STARTUP] Warming up Keycloak connections...')
    try {
      // Test the circuit breaker status endpoint (doesn't require auth)
      const circuitStatus = keycloakClient.getCircuitBreakerStatus()
      console.log('[STARTUP] ✅ Keycloak client initialized:', circuitStatus)
      
      // Optionally test connectivity (uncomment if needed)
      // const testUrl = 'https://auth.portnimara.dev/realms/client-portal/.well-known/openid-configuration'
      // await keycloakClient.fetch(testUrl, {}, { timeout: 5000, retries: 1 })
      // console.log('[STARTUP] ✅ Keycloak connectivity verified')
      
    } catch (error) {
      console.error('[STARTUP] ⚠️ Keycloak warmup failed:', error)
      // Continue anyway - circuit breaker will handle runtime failures
    }
    
    // Mark app as ready
    isAppReady = true
    console.log('[STARTUP] ✅ Server-side initialization complete - app ready')
    
  } catch (error) {
    console.error('[STARTUP] ❌ Server-side initialization error:', error)
    // Don't throw - let the app continue with fallback behavior
    isAppReady = true // Allow app to start even with initialization errors
  }
})

// Export readiness check for health endpoint
export const getAppReadiness = () => ({
  ready: isAppReady,
  keycloakCircuitBreaker: keycloakClient.getCircuitBreakerStatus()
})