"use client"

import { useEffect, useMemo, useRef, useState } from "react"
import type { AiChatContext } from "@/lib/ai/chat-context"
import { buildEmbedSearchParams, systemPromptFromContext } from "@/lib/ai/chat-context"
import { buildAiEmbedUrl, resolveAiEmbedOrigin } from "@/lib/ai/embed-url"
import { useAiIframeExternalLinks } from "@/lib/ai/use-ai-iframe-navigation"
import { useAiConfig, useCreateAiSession } from "@/lib/api/hooks/use-ai-queries"
import { useTheme } from "next-themes"

type AiChatIframeProps = {
  publicPath?: string
  context: AiChatContext
  className?: string
}

export function AiChatIframe({ publicPath = "/ai", context, className }: AiChatIframeProps) {
  const iframeRef = useRef<HTMLIFrameElement>(null)
  const { resolvedTheme } = useTheme()
  const { data: config, isSuccess } = useAiConfig()
  const createSession = useCreateAiSession()
  const [sessionToken, setSessionToken] = useState<string | undefined>()
  const [sessionId, setSessionId] = useState<string | undefined>()
  const sessionContextKey = useMemo(
    () =>
      [
        context.app,
        context.temporary,
        context.messageId,
        context.accountId,
        context.drivePath,
        context.fileId,
        context.contactId,
      ].join("|"),
    [
      context.app,
      context.temporary,
      context.messageId,
      context.accountId,
      context.drivePath,
      context.fileId,
      context.contactId,
    ]
  )
  const embedOrigin = useMemo(() => resolveAiEmbedOrigin(publicPath), [publicPath])
  const enabledTools = config?.enabled_tools ?? []
  const mcpUrl = config?.mcp_url ?? "/api/v1/ai/mcp"

  const iframeSrc = useMemo(() => {
    if (!isSuccess || !config?.enabled) return null
    const qs = buildEmbedSearchParams(context, config.default_model)
    return buildAiEmbedUrl(publicPath, qs)
  }, [isSuccess, config, publicPath, context])

  useAiIframeExternalLinks(embedOrigin)

  useEffect(() => {
    if (!config?.enabled) return
    let cancelled = false
    createSession
      .mutateAsync(context)
      .then((session) => {
        if (cancelled) return
        setSessionToken(session.token_secret)
        setSessionId(session.session_id)
      })
      .catch(() => {
        if (!cancelled) {
          setSessionToken(undefined)
          setSessionId(undefined)
        }
      })
    return () => {
      cancelled = true
    }
  }, [config?.enabled, sessionContextKey, context, createSession.mutateAsync])

  useEffect(() => {
    const iframe = iframeRef.current
    if (!iframe?.contentWindow || !embedOrigin) return
    iframe.contentWindow.postMessage(
      { type: "ULTI_THEME", theme: resolvedTheme === "dark" ? "dark" : "light" },
      embedOrigin
    )
  }, [resolvedTheme, embedOrigin])

  useEffect(() => {
    const iframe = iframeRef.current
    if (!iframe?.contentWindow || !embedOrigin) return
    const systemPrompt = [
      systemPromptFromContext(context),
      context.systemPromptExtra,
    ]
      .filter(Boolean)
      .join("\n\n")
    iframe.contentWindow.postMessage(
      {
        type: "ULTI_CONTEXT_UPDATE",
        context,
        systemPrompt: systemPrompt || undefined,
      },
      embedOrigin
    )
  }, [context, embedOrigin])

  useEffect(() => {
    const iframe = iframeRef.current
    if (!iframe?.contentWindow || !embedOrigin || !sessionToken) return
    iframe.contentWindow.postMessage(
      {
        type: "ULTI_SESSION",
        token_secret: sessionToken,
        session_id: sessionId,
        mcp_url: mcpUrl,
        enabled_tools: enabledTools,
        default_model: config?.default_model,
      },
      embedOrigin
    )
  }, [sessionToken, sessionId, mcpUrl, enabledTools, config?.default_model, embedOrigin])

  if (!iframeSrc) {
    return (
      <div
        className={className}
        aria-busy="true"
        aria-label="Chargement UltiAI"
      />
    )
  }

  return (
    <iframe
      key={iframeSrc}
      ref={iframeRef}
      title="UltiAI"
      src={iframeSrc}
      className={className}
      sandbox="allow-scripts allow-same-origin allow-forms allow-popups allow-downloads"
      allow="clipboard-read; clipboard-write"
    />
  )
}