/**
 * Query Builder UI
 *
 * UI компонент для построителя запросов.
 */

import appState from '../state/appState.js'
import queryService from '../services/query.service.js'
import loadingUI from './loading.ui.js'
import { validateJSON } from '../utils/validation.utils.js'
import { addClass, removeClass, hideElement, showElement, getInputValue, setElementText } from '../utils/dom.utils.js'
import { showToast } from '../utils/dom.utils.js'

/**
 * Показать построитель запросов
 */
export function show() {
  const queryBuilder = document.getElementById('query-builder')
  const answerViewer = document.getElementById('answer-viewer')

  if (queryBuilder) {
    removeClass(queryBuilder, 'hidden')
  }

  if (answerViewer) {
    addClass(answerViewer, 'hidden')
  }
}

/**
 * Переключить режим запроса (questions / raw-json)
 * @param {string} mode - Режим ('questions' или 'raw-json')
 */
export function switchMode(mode) {
  // Update toggle buttons
  const toggleButtons = document.querySelectorAll('.toggle-option')
  toggleButtons.forEach(btn => {
    removeClass(btn, 'active')
    if (btn.dataset.mode === mode) {
      addClass(btn, 'active')
    }
  })

  // Show/hide mode panels
  const questionsMode = document.getElementById('questions-mode')
  const rawJsonMode = document.getElementById('raw-json-mode')

  if (mode === 'questions') {
    showElement(questionsMode)
    hideElement(rawJsonMode)
  } else if (mode === 'raw-json') {
    hideElement(questionsMode)
    showElement(rawJsonMode)
  }
}

/**
 * Валидация JSON в raw-json режиме
 * @returns {boolean} True если JSON валиден
 */
export function validateJSONMode() {
  const textarea = document.getElementById('json-textarea')
  const message = document.getElementById('json-validation-message')

  if (!textarea || !message) {
    console.error('JSON textarea or validation message not found')
    return false
  }

  const jsonText = getInputValue(textarea)
  const validation = validateJSON(jsonText)

  if (validation.valid) {
    removeClass(textarea, 'error')
    removeClass(message, 'error')
    addClass(message, 'color-success')

    const count = Array.isArray(validation.data) ? validation.data.length : 0
    setElementText(message, `✓ JSON валиден (${count} вопросов)`)

    return true
  } else {
    addClass(textarea, 'error')
    addClass(message, 'error')
    removeClass(message, 'color-success')
    setElementText(message, `✗ Ошибка: ${validation.error}`)

    return false
  }
}

/**
 * Обработать отправку запроса
 * @param {Function} onSuccess - Callback при успешной отправке
 */
export async function handleSendQuery(onSuccess) {
  try {
    const envSettings = appState.getCurrentEnvSettings()
    const currentEnvKey = appState.getCurrentEnvironment()
    const apiMode = envSettings?.apiMode || 'bench'

    // Get current mode from toggle
    const activeToggle = document.querySelector('.toggle-option.active')
    const mode = activeToggle?.dataset.mode || 'questions'

    // Get form values
    const questionsText = getInputValue('questions-textarea')
    const jsonText = getInputValue('json-textarea')

    // Build request body
    const requestBody = queryService.buildRequestBody(mode, questionsText, jsonText)

    // Show loading
    const loadingMsg = apiMode === 'backend'
      ? 'Отправка запроса к Backend API...'
      : 'Отправка запроса к Bench API...'
    loadingUI.show(loadingMsg)

    // Send query
    const resetSession = envSettings?.resetSessionMode !== false
    const apiResponse = await queryService.sendQuery(
      currentEnvKey,
      apiMode,
      requestBody,
      resetSession
    )

    // Hide loading
    loadingUI.hide()

    // Process response
    queryService.processQueryResponse(currentEnvKey, requestBody, apiResponse)

    // Call success callback
    if (typeof onSuccess === 'function') {
      onSuccess()
    }
  } catch (error) {
    console.error('Query failed:', error)
    loadingUI.hide()
    showToast(`Ошибка запроса: ${error.message}`, 'error')
  }
}

/**
 * Переключить между табами
 * @param {HTMLElement} tabButton - Кнопка таба
 * @param {string} tabId - ID контента таба
 */
export function switchTab(tabButton, tabId) {
  if (!tabButton || !tabId) {
    return
  }

  // Get all tabs in the same group
  const tabsContainer = tabButton.parentElement
  const tabs = tabsContainer.querySelectorAll('.tab')

  // Deactivate all tabs
  tabs.forEach(tab => removeClass(tab, 'active'))

  // Activate clicked tab
  addClass(tabButton, 'active')

  // Find and show corresponding content
  const contentContainer = tabsContainer.nextElementSibling
  if (contentContainer && contentContainer.classList.contains('tab-content')) {
    // Handle nested tabs
    const parent = tabsContainer.parentElement
    const allContents = parent.querySelectorAll('.tab-content')

    allContents.forEach(content => {
      if (content.id === tabId) {
        addClass(content, 'active')
      } else if (!content.contains(tabsContainer)) {
        removeClass(content, 'active')
      }
    })
  } else {
    // Handle top-level tabs
    const parent = tabsContainer.parentElement
    const allContents = parent.querySelectorAll(':scope > .tab-content')

    allContents.forEach(content => {
      if (content.id === tabId) {
        addClass(content, 'active')
      } else {
        removeClass(content, 'active')
      }
    })

    // If activated content has nested tabs, ensure first nested tab-content is shown
    const activatedContent = document.getElementById(tabId)
    if (activatedContent) {
      const nestedTabsContainer = activatedContent.querySelector('.tabs')
      if (nestedTabsContainer) {
        // Activate first nested tab button
        const nestedTabs = nestedTabsContainer.querySelectorAll('.tab')
        nestedTabs.forEach((tab, index) => {
          if (index === 0) {
            addClass(tab, 'active')
          } else {
            removeClass(tab, 'active')
          }
        })

        // Find nested tab-content elements
        const children = Array.from(activatedContent.children)
        const nestedContents = children.filter(el =>
          el.classList.contains('tab-content') &&
          el !== nestedTabsContainer
        )

        // Deactivate all first, then activate first one
        nestedContents.forEach(content => removeClass(content, 'active'))
        if (nestedContents.length > 0) {
          addClass(nestedContents[0], 'active')
        }
      }
    }
  }
}

/**
 * Инициализация обработчиков событий
 * @param {Function} onQuerySuccess - Callback при успешной отправке запроса
 */
export function setupListeners(onQuerySuccess) {
  // Toggle mode buttons
  const toggleButtons = document.querySelectorAll('.toggle-option')
  toggleButtons.forEach(btn => {
    btn.addEventListener('click', () => {
      const mode = btn.dataset.mode
      if (mode) {
        switchMode(mode)
      }
    })
  })

  // JSON validation
  const jsonTextarea = document.getElementById('json-textarea')
  if (jsonTextarea) {
    jsonTextarea.addEventListener('input', validateJSONMode)
  }

  // Send query button
  const sendQueryBtn = document.getElementById('send-query-btn')
  if (sendQueryBtn) {
    sendQueryBtn.addEventListener('click', () => handleSendQuery(onQuerySuccess))
  }
}

// Export as default object
export default {
  show,
  switchMode,
  validateJSONMode,
  handleSendQuery,
  switchTab,
  setupListeners
}