import { createApp } from 'vue'
import { createRouter, createWebHistory } from 'vue-router'
import { createPinia } from 'pinia'
// Core plugin system
import { pluginManager } from './core/plugin-manager'
import { eventBus } from './core/event-bus'
import { container } from './core/di-container'

// App configuration
import appConfig from './app.config'

// Base modules
import baseModule from './modules/base'
import nostrFeedModule from './modules/nostr-feed'
import chatModule from './modules/chat'
import eventsModule from './modules/events'
import marketModule from './modules/market'

// Root component
import App from './App.vue'

// Styles
import './assets/index.css'

// Use existing i18n setup
import { i18n } from './i18n'

/**
 * Initialize and start the modular application
 */
export async function createAppInstance() {
  console.log('🚀 Starting modular application...')

  // Create Vue app
  const app = createApp(App)

  // Create router
  const router = createRouter({
    history: createWebHistory(),
    routes: [
      // Default route - will be populated by modules
      {
        path: '/',
        name: 'home',
        component: () => import('./pages/Home.vue'),
        meta: { requiresAuth: true }
      },
      {
        path: '/login',
        name: 'login',
        component: () => import('./pages/LoginDemo.vue'),
        meta: { requiresAuth: false }
      }
    ]
  })

  // Use existing i18n setup

  // Create Pinia store
  const pinia = createPinia()

  // Install core plugins
  app.use(router)
  app.use(pinia)
  app.use(i18n)

  // Initialize plugin manager
  pluginManager.init(app, router)

  // Register modules based on configuration
  const moduleRegistrations = []

  // Register base module first (required)
  if (appConfig.modules.base.enabled) {
    moduleRegistrations.push(
      pluginManager.register(baseModule, appConfig.modules.base)
    )
  }

  // Register nostr-feed module
  if (appConfig.modules['nostr-feed'].enabled) {
    moduleRegistrations.push(
      pluginManager.register(nostrFeedModule, appConfig.modules['nostr-feed'])
    )
  }

  // Register chat module
  if (appConfig.modules.chat.enabled) {
    moduleRegistrations.push(
      pluginManager.register(chatModule, appConfig.modules.chat)
    )
  }

  // Register events module
  if (appConfig.modules.events.enabled) {
    moduleRegistrations.push(
      pluginManager.register(eventsModule, appConfig.modules.events)
    )
  }

  // Register market module
  if (appConfig.modules.market.enabled) {
    moduleRegistrations.push(
      pluginManager.register(marketModule, appConfig.modules.market)
    )
  }

  // Wait for all modules to register
  await Promise.all(moduleRegistrations)

  // Install all enabled modules
  await pluginManager.installAll()

  // Set up auth guard  
  router.beforeEach(async (to, _from, next) => {
    // Import the auth composable to ensure we're using the same instance as the rest of the app
    const { auth } = await import('@/composables/useAuth')
    
    if (to.meta.requiresAuth && !auth.isAuthenticated.value) {
      console.log('Auth guard: User not authenticated, redirecting to login')
      next('/login')
    } else if (to.path === '/login' && auth.isAuthenticated.value) {
      console.log('Auth guard: User already authenticated, redirecting to home')
      next('/')
    } else {
      console.log(`Auth guard: Allowing navigation to ${to.path}`)
      next()
    }
  })

  // Global error handling
  app.config.errorHandler = (err, _vm, info) => {
    console.error('Global error:', err, info)
    eventBus.emit('app:error', { error: err, info }, 'app')
  }

  // Development helpers
  if (appConfig.features.developmentMode) {
    // Expose debugging helpers globally
    ;(window as any).__pluginManager = pluginManager
    ;(window as any).__eventBus = eventBus
    ;(window as any).__container = container

    console.log('🔧 Development mode enabled')
    console.log('Available globals: __pluginManager, __eventBus, __container')
  }

  console.log('✅ Application initialized successfully')
  
  return { app, router }
}

/**
 * Start the application
 */
export async function startApp() {
  try {
    const { app } = await createAppInstance()
    
    // Mount the app
    app.mount('#app')
    
    console.log('🎉 Application started!')
    
    // Emit app started event
    eventBus.emit('app:started', {}, 'app')
    
  } catch (error) {
    console.error('💥 Failed to start application:', error)
    
    // Show error to user
    document.getElementById('app')!.innerHTML = `
      <div style="padding: 20px; text-align: center; color: red;">
        <h1>Application Failed to Start</h1>
        <p>${error instanceof Error ? error.message : 'Unknown error'}</p>
        <p>Please refresh the page or contact support.</p>
      </div>
    `
  }
}