import {
  IN_BROWSER,
  SUPPORTS_TOUCH,
  SUPPORTS_MATCH_MEDIA,
  SUPPORTS_OBSERVER,
  SUPPORTS_INTERSECTION_OBSERVER,
  SUPPORTS_MUTATION_OBSERVER,
  version,
  __LOGGER_ENABLED__
} from '#v0/constants'

const IN_BROWSER: boolean

export const IN_BROWSER = typeof window !== 'undefined'

import { IN_BROWSER } from '#v0/constants'

if (IN_BROWSER) {
  // Safe to access window, document, localStorage, etc.
  window.addEventListener('resize', handleResize)
}

// Conditionally import browser-only code
const storage = IN_BROWSER
  ? window.localStorage
  : new Map() // SSR fallback

<script setup lang="ts">
import { IN_BROWSER } from '#v0/constants'
import { onMounted } from 'vue'

if (IN_BROWSER) {
  // Run immediately in browser
  console.log('Browser detected')
} else {
  // Use onMounted for SSR-safe initialization
  onMounted(() => {
    console.log('Client hydrated')
  })
}
</script>

const SUPPORTS_TOUCH: boolean

export const SUPPORTS_TOUCH = IN_BROWSER && (
  'ontouchstart' in window || window.navigator.maxTouchPoints > 0
)

import { SUPPORTS_TOUCH } from '#v0/constants'

if (SUPPORTS_TOUCH) {
  element.addEventListener('touchstart', handleTouch)
} else {
  element.addEventListener('mousedown', handleMouse)
}

// Adjust UI for touch devices
const buttonSize = SUPPORTS_TOUCH ? 'large' : 'medium'

const SUPPORTS_MATCH_MEDIA: boolean

export const SUPPORTS_MATCH_MEDIA = IN_BROWSER &&
  'matchMedia' in window &&
  typeof window.matchMedia === 'function'

import { SUPPORTS_MATCH_MEDIA } from '#v0/constants'

if (SUPPORTS_MATCH_MEDIA) {
  const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
  mediaQuery.addEventListener('change', handleThemeChange)
}

// Safe media query helper
function useMediaQuery(query: string) {
  if (!SUPPORTS_MATCH_MEDIA) return false
  return window.matchMedia(query).matches
}

const isDark = useMediaQuery('(prefers-color-scheme: dark)')

const SUPPORTS_OBSERVER: boolean

export const SUPPORTS_OBSERVER = IN_BROWSER && 'ResizeObserver' in window

import { SUPPORTS_OBSERVER } from '#v0/constants'

if (SUPPORTS_OBSERVER) {
  const observer = new ResizeObserver(entries => {
    for (const entry of entries) {
      console.log('Element resized:', entry.contentRect)
    }
  })
  observer.observe(element)
} else {
  // Fallback: use window resize listener
  window.addEventListener('resize', handleResize)
}

const SUPPORTS_INTERSECTION_OBSERVER: boolean

export const SUPPORTS_INTERSECTION_OBSERVER = IN_BROWSER &&
  'IntersectionObserver' in window

import { SUPPORTS_INTERSECTION_OBSERVER } from '#v0/constants'

if (SUPPORTS_INTERSECTION_OBSERVER) {
  const observer = new IntersectionObserver(entries => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        console.log('Element is visible')
      }
    })
  })
  observer.observe(element)
} else {
  // Fallback: assume always visible or use scroll listener
  console.log('IntersectionObserver not supported')
}

// Lazy loading images
if (SUPPORTS_INTERSECTION_OBSERVER) {
  const lazyImages = document.querySelectorAll('img[data-src]')
  const imageObserver = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        const img = entry.target as HTMLImageElement
        img.src = img.dataset.src!
        imageObserver.unobserve(img)
      }
    })
  })

  lazyImages.forEach(img => imageObserver.observe(img))
}

const SUPPORTS_MUTATION_OBSERVER: boolean

export const SUPPORTS_MUTATION_OBSERVER = IN_BROWSER &&
  'MutationObserver' in window

import { SUPPORTS_MUTATION_OBSERVER } from '#v0/constants'

if (SUPPORTS_MUTATION_OBSERVER) {
  const observer = new MutationObserver(mutations => {
    mutations.forEach(mutation => {
      console.log('DOM changed:', mutation.type)
    })
  })

  observer.observe(element, {
    attributes: true,
    childList: true,
    subtree: true
  })
} else {
  // Fallback: manual tracking or polling
  console.log('MutationObserver not supported')
}

const version: string

export const version = typeof __VERSION__ === 'undefined' ? '0.0.0' : __VERSION__

import { version } from '#v0/constants'

console.log(`Running @vuetify/v0 ${version}`)

// Feature detection based on version
const [major, minor, patch] = version.split('.').map(Number)
if (major >= 1) {
  // Use new API
}

const __LOGGER_ENABLED__: boolean

export const __LOGGER_ENABLED__ = (
  typeof __DEV__ !== 'undefined' && __DEV__
) || (
  typeof __VITE_LOGGER_ENABLED__ !== 'undefined' &&
  __VITE_LOGGER_ENABLED__ === 'true'
)

import { __LOGGER_ENABLED__ } from '#v0/constants'

if (__LOGGER_ENABLED__) {
  console.log('[v0] Debug information')
}

// Tree-shaking: dead code elimination in production
if (__LOGGER_ENABLED__) {
  // This entire block will be removed in production builds
  console.group('[v0] Performance Metrics')
  console.log('Render time:', performance.now())
  console.groupEnd()
}

const SELF_CLOSING_TAGS: Set<SelfClosingElement>

import { SELF_CLOSING_TAGS } from '#v0/constants'

if (SELF_CLOSING_TAGS.has(tagName)) {
  // Don't try to append children
}

const COMMON_ELEMENTS: Record<string, string>

import { COMMON_ELEMENTS } from '#v0/constants'

const element = COMMON_ELEMENTS.BUTTON // 'button'
const container = COMMON_ELEMENTS.DIV   // 'div'

function isSelfClosingTag(tag: keyof HTMLElementTagNameMap): boolean

import { isSelfClosingTag } from '#v0/constants'

isSelfClosingTag('img')   // true
isSelfClosingTag('div')   // false
isSelfClosingTag('input') // true