/**
 * Brief Bench - Main Entry Point
 *
 * Главная точка входа приложения.
 * Импортирует все модули и инициализирует приложение.
 */

// Import services
import * as authService from './services/auth.service.js'
import settingsService from './services/settings.service.js'
import queryService from './services/query.service.js'

// Import UI components
import authUI from './ui/auth.ui.js'
import loadingUI from './ui/loading.ui.js'
import settingsUI from './ui/settings.ui.js'
import queryBuilderUI from './ui/query-builder.ui.js'
import questionsListUI from './ui/questions-list.ui.js'
import answerViewerUI from './ui/answer-viewer.ui.js'
import annotationsUI from './ui/annotations.ui.js'

// Import state
import appState from './state/appState.js'

// Import utils
import { showToast } from './utils/dom.utils.js'
import { downloadJSON } from './utils/file.utils.js'
import { ENVIRONMENTS } from './config.js'

// ============================================
// Global Functions (for HTML onclick handlers)
// ============================================

/**
 * Expose functions to window for HTML onclick handlers
 */
window.selectAnswer = function(index) {
  questionsListUI.selectAnswer(index, (idx) => {
    answerViewerUI.render(idx, annotationsUI.loadForAnswer)
  })
}

window.toggleExpansion = function(id) {
  answerViewerUI.toggleExpansion(id)
}

window.switchTab = function(tabButton, tabId) {
  queryBuilderUI.switchTab(tabButton, tabId)
}

// ============================================
// Environment Management
// ============================================

/**
 * Switch to a different environment
 * @param {string} env - Environment name (ift/psi/prod)
 */
function switchEnvironment(env) {
  // Save current environment data
  const currentEnv = appState.getCurrentEnvironment()
  appState.saveEnvironmentToStorage(currentEnv)

  // Switch environment
  appState.setCurrentEnvironment(env)
  appState.updateSettings({ activeEnvironment: env })

  // Update UI
  updateEnvironmentTabs()

  // Reload content for new environment
  const newEnv = appState.getCurrentEnv()
  if (newEnv.currentResponse) {
    questionsListUI.render()
    answerViewerUI.render(newEnv.currentAnswerIndex, annotationsUI.loadForAnswer)
  } else {
    queryBuilderUI.show()
  }

  console.log('Switched to environment:', env)
}

/**
 * Update environment tabs visual state
 */
function updateEnvironmentTabs() {
  const currentEnv = appState.getCurrentEnvironment()

  document.querySelectorAll('.env-tab').forEach(tab => {
    if (tab.dataset.env === currentEnv) {
      tab.classList.add('active')
    } else {
      tab.classList.remove('active')
    }
  })
}

// ============================================
// Event Listeners Setup
// ============================================

/**
 * Setup all event listeners
 */
function setupEventListeners() {
  // Prevent double-binding
  if (window._eventListenersSetup) {
    return
  }
  window._eventListenersSetup = true

  // Environment tabs
  document.querySelectorAll('.env-tab').forEach(tab => {
    tab.addEventListener('click', (e) => {
      const env = e.target.dataset.env
      if (env) {
        switchEnvironment(env)
      }
    })
  })

  // Settings environment selector change
  const settingsEnvSelector = document.getElementById('settings-env-selector')
  if (settingsEnvSelector) {
    settingsEnvSelector.addEventListener('change', () => {
      // Save current environment settings first
      const currentSettings = settingsUI.read()
      if (currentSettings) {
        appState.setSettings(currentSettings)
      }
      // Load new environment settings
      settingsUI.populate()
    })
  }

  // Setup UI component listeners
  authUI.setupListeners()
  settingsUI.setupListeners()
  queryBuilderUI.setupListeners(() => {
    // Callback after successful query
    questionsListUI.render()
    answerViewerUI.render(0, annotationsUI.loadForAnswer)
  })

  // Tab switching
  document.querySelectorAll('.tab').forEach(tab => {
    tab.addEventListener('click', (e) => {
      const tabId = e.target.dataset.tab
      if (tabId) {
        queryBuilderUI.switchTab(e.target, tabId)
      }
    })
  })

  // Close dialog on overlay click
  const settingsDialog = document.getElementById('settings-dialog')
  if (settingsDialog) {
    settingsDialog.addEventListener('click', (e) => {
      if (e.target.id === 'settings-dialog') {
        settingsUI.close()
      }
    })
  }

  console.log('Event listeners setup complete')
}

// ============================================
// Export/Import Functions
// ============================================

/**
 * Export current analysis to JSON file
 */
window.exportAnalysis = function() {
  const env = appState.getCurrentEnv()
  const currentEnvKey = appState.getCurrentEnvironment()

  if (!env.currentResponse) {
    showToast('Нет данных для экспорта', 'warning')
    return
  }

  const exportData = {
    environment: currentEnvKey,
    request_id: env.requestId,
    timestamp: env.requestTimestamp,
    request: env.currentRequest,
    response: env.currentResponse,
    annotations: env.annotations
  }

  const timestamp = new Date().toISOString().replace(/[:.]/g, '-').substring(0, 19)
  const filename = `brief-bench-analysis-${currentEnvKey}-${timestamp}.json`

  downloadJSON(exportData, filename)
  showToast(`Анализ экспортирован: ${filename}`, 'success')
}

/**
 * Import analysis from JSON file
 */
window.importAnalysis = function() {
  const input = document.createElement('input')
  input.type = 'file'
  input.accept = 'application/json'

  input.onchange = async (e) => {
    const file = e.target.files[0]
    if (!file) return

    try {
      loadingUI.show('Импорт анализа...')

      const text = await file.text()
      const data = JSON.parse(text)

      // Validate data
      if (!data.response || !data.response.answers) {
        throw new Error('Некорректный формат файла анализа')
      }

      const currentEnvKey = appState.getCurrentEnvironment()
      const env = appState.getEnvironment(currentEnvKey)

      // Load data
      env.currentRequest = data.request || []
      env.currentResponse = data.response
      env.requestId = data.request_id || 'imported'
      env.requestTimestamp = data.timestamp || new Date().toISOString()
      env.annotations = data.annotations || {}
      env.currentAnswerIndex = 0

      // Save to localStorage
      appState.saveEnvironmentToStorage(currentEnvKey)

      // Update UI
      questionsListUI.render()
      answerViewerUI.render(0, annotationsUI.loadForAnswer)

      loadingUI.hide()
      showToast('Анализ успешно импортирован', 'success')
    } catch (error) {
      loadingUI.hide()
      console.error('Failed to import analysis:', error)
      showToast(`Ошибка импорта: ${error.message}`, 'error')
    }
  }

  input.click()
}

// ============================================
// Application Initialization
// ============================================

/**
 * Initialize application
 */
async function initApp() {
  try {
    // Load settings from server
    await settingsService.loadFromServer()

    // Set current environment from settings
    const activeEnv = appState.settings?.activeEnvironment || 'ift'
    appState.setCurrentEnvironment(activeEnv)

    // Load saved data for each environment from localStorage
    ENVIRONMENTS.forEach(env => {
      appState.loadEnvironmentFromStorage(env)
    })

    // Setup event listeners
    setupEventListeners()

    // Update environment tabs
    updateEnvironmentTabs()

    // Show query builder by default
    queryBuilderUI.show()

    console.log('Brief Bench initialized - Environment:', appState.getCurrentEnvironment())
  } catch (error) {
    console.error('Failed to initialize app:', error)
    showToast('Ошибка инициализации приложения', 'error')
  }
}

// ============================================
// Application Entry Point
// ============================================

/**
 * Initialize app on DOM load
 */
document.addEventListener('DOMContentLoaded', async () => {
  console.log('Brief Bench starting...')

  // Setup event listeners first (including login/logout)
  setupEventListeners()

  // Check authentication
  const isAuthenticated = await authService.checkAuth()

  if (isAuthenticated) {
    // User is authenticated, initialize app
    authUI.hideLoginScreen()
    await initApp()
  } else {
    // User is not authenticated, show login screen
    authUI.showLoginScreen()
  }
})