import { ref, readonly } from 'vue'
import { archyBridge } from '@/services/archyBridge'

type AIContextCategory = 'apps' | 'system' | 'network' | 'wallet' | 'files'

interface ArchyApp {
  id: string
  name: string
  state: string
  status: string
}

interface ArchySystemInfo {
  version?: string
  name?: string
}

interface ArchyNetworkInfo {
  connected?: boolean
}

export interface ArchyWalletInfo {
  balanceSats?: number
  channelCount?: number
  totalCapacitySats?: number
  nodePubkey?: string
}

export interface ArchyFileEntry {
  name: string
  path: string
  size?: number
  modified?: string
  type: 'file' | 'folder'
}

// Singleton reactive state (shared across all components using this composable)
const isEmbedded = ref(false)
const isInitialized = ref(false)
const permissions = ref<AIContextCategory[]>([])
const accentColor = ref<string | null>(null)
const installedApps = ref<ArchyApp[]>([])
const systemInfo = ref<ArchySystemInfo>({})
const networkInfo = ref<ArchyNetworkInfo>({})
const walletInfo = ref<ArchyWalletInfo>({})
const fileList = ref<ArchyFileEntry[]>([])
let cleanups: (() => void)[] = []

/**
 * Reactive composable wrapping archyBridge for Archy ↔ AIUI integration.
 * Call `init()` once in App.vue when `?embedded=true` is detected.
 */
export function useArchy() {
  /** Initialize the bridge and start listening for Archy messages */
  function init() {
    if (isInitialized.value) return

    const embedded = !!(window as unknown as Record<string, unknown>).__AIUI_EMBEDDED__
    isEmbedded.value = embedded
    if (!embedded || !archyBridge.isInArchy()) return

    archyBridge.init()
    isInitialized.value = true

    // Listen for permission updates
    const unsubPerms = archyBridge.onPermissionsUpdate((cats) => {
      permissions.value = cats
      // Auto-fetch context for newly permitted categories
      fetchPermittedContext(cats)
    })
    cleanups.push(unsubPerms)

    // Listen for theme updates
    const unsubTheme = archyBridge.onThemeUpdate((theme) => {
      accentColor.value = theme.accent
      applyAccentColor(theme.accent)
    })
    cleanups.push(unsubTheme)

    // Request theme on init
    archyBridge.requestTheme()
  }

  /** Fetch context for all permitted categories */
  async function fetchPermittedContext(cats: AIContextCategory[]) {
    const fetches: Promise<void>[] = []

    if (cats.includes('apps')) {
      fetches.push(
        archyBridge.requestContext('apps').then((res) => {
          if (res.permitted && Array.isArray(res.data)) {
            installedApps.value = res.data as ArchyApp[]
          }
        }).catch(() => {}),
      )
    }

    if (cats.includes('system')) {
      fetches.push(
        archyBridge.requestContext('system').then((res) => {
          if (res.permitted && res.data) {
            systemInfo.value = res.data as ArchySystemInfo
          }
        }).catch(() => {}),
      )
    }

    if (cats.includes('network')) {
      fetches.push(
        archyBridge.requestContext('network').then((res) => {
          if (res.permitted && res.data) {
            networkInfo.value = res.data as ArchyNetworkInfo
          }
        }).catch(() => {}),
      )
    }

    if (cats.includes('wallet')) {
      fetches.push(
        archyBridge.requestContext('wallet').then((res) => {
          if (res.permitted && res.data) {
            walletInfo.value = res.data as ArchyWalletInfo
          }
        }).catch(() => {}),
      )
    }

    if (cats.includes('files')) {
      fetches.push(
        archyBridge.requestContext('files').then((res) => {
          if (res.permitted && Array.isArray(res.data)) {
            fileList.value = res.data as ArchyFileEntry[]
          }
        }).catch(() => {}),
      )
    }

    await Promise.all(fetches)
  }

  /** Refresh context data (call when user returns to chat) */
  async function refreshContext() {
    if (!isInitialized.value) return
    await fetchPermittedContext(permissions.value)
  }

  /** Request Archy to perform an action */
  async function requestAction(action: string, params: Record<string, string> = {}) {
    if (!isInitialized.value) return { success: false, error: 'Not initialized' }
    return archyBridge.requestAction(action, params)
  }

  /** Apply accent color as CSS custom property */
  function applyAccentColor(color: string) {
    document.documentElement.style.setProperty('--color-accent', color)
  }

  /** Build context string for AI system prompt */
  function buildArchyContext(): string {
    if (!isInitialized.value) return ''

    const sections: string[] = []

    if (permissions.value.includes('apps') && installedApps.value.length > 0) {
      const appList = installedApps.value
        .map((a) => `- ${a.name} (${a.state}${a.status ? ', ' + a.status : ''})`)
        .join('\n')
      sections.push(`**Installed apps on this node:**\n${appList}`)
    }

    if (permissions.value.includes('system') && systemInfo.value.name) {
      const sys = systemInfo.value
      sections.push(`**System:** ${sys.name}${sys.version ? ' v' + sys.version : ''}`)
    }

    if (permissions.value.includes('network')) {
      const net = networkInfo.value
      sections.push(`**Network:** ${net.connected ? 'Connected' : 'Disconnected'}`)
    }

    if (permissions.value.includes('wallet') && walletInfo.value.balanceSats !== undefined) {
      const w = walletInfo.value
      const balance = w.balanceSats!
      const parts = [`Balance: ${balance.toLocaleString()} sats`]
      if (w.channelCount !== undefined) parts.push(`${w.channelCount} channels`)
      if (w.totalCapacitySats !== undefined) parts.push(`Total capacity: ${w.totalCapacitySats.toLocaleString()} sats`)
      if (w.nodePubkey) parts.push(`Pubkey: ${w.nodePubkey.slice(0, 8)}...`)
      sections.push(`**Lightning Wallet:** ${parts.join(' | ')}`)
    }

    if (permissions.value.includes('files') && fileList.value.length > 0) {
      const files = fileList.value
      const recent = files.slice(0, 20)
      const fileNames = recent.map((f) => f.name).join(', ')
      sections.push(`**Files:** ${files.length} files in Nextcloud. Recent: ${fileNames}`)
    }

    if (sections.length === 0) return ''

    return `\n\n**Archy Node Context** (this user is running AIUI on their Archipelago node):\n${sections.join('\n')}\n\nYou can help the user manage their node. Available actions: open an app (open-app), install an app (install-app), navigate in Archy (navigate). When recommending apps, check if they're already installed.`
  }

  /** Clean up on component unmount */
  function destroy() {
    for (const cleanup of cleanups) cleanup()
    cleanups = []
    archyBridge.destroy()
    isInitialized.value = false
  }

  return {
    isEmbedded: readonly(isEmbedded),
    isInitialized: readonly(isInitialized),
    permissions: readonly(permissions),
    accentColor: readonly(accentColor),
    installedApps: readonly(installedApps),
    systemInfo: readonly(systemInfo),
    networkInfo: readonly(networkInfo),
    walletInfo: readonly(walletInfo),
    fileList: readonly(fileList),
    init,
    destroy,
    refreshContext,
    requestAction,
    buildArchyContext,
  }
}