quorum/src/app/chat/page.tsx at d3766ebb4ce7d65a659a0902b4748e9986b00655 · aiedwardyi/quorum · GitHub

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"use client"

import { Suspense, useCallback, useRef, useEffect, useState } from "react"
import { useSearchParams, useRouter } from "next/navigation"
import { THEMES } from "@/types"
import type { Provider, Locale, ResponseLength, Theme, Message, VerdictResult } from "@/types"
import { useDebateEngine } from "@/hooks/useDebateEngine"
import ChatThread from "@/components/ChatThread"
import MessageInput from "@/components/MessageInput"
import ConsensusMeter from "@/components/ConsensusMeter"
import ChatHeader from "@/components/Header"
import dynamic from "next/dynamic"
const SettingsModal = dynamic(() => import("@/components/SettingsModal"), { ssr: false })
import { AnimatePresence, motion } from "framer-motion"
import { ChevronDown } from "lucide-react"
import { useThreadPersistence } from "@/hooks/useThreadPersistence"
import { incrementDebateCount } from "@/components/LoginGate"

const DEFAULT_MODELS: Provider[] = ["gemini", "perplexity", "claude", "gpt"]

export default function ChatPage() {
  return (
    <Suspense>
      <ChatPageContent />
    </Suspense>
  )
}

function ChatPageContent() {
  // Config loaded from sessionStorage (set by homepage)
  const [locale, setLocale] = useState<Locale>("ko")
  const [responseLength, setResponseLength] = useState<ResponseLength>("short")
  const [maxRounds, setMaxRounds] = useState(1)
  const [theme, setTheme] = useState<Theme>("dark")
  const [isSettingsOpen, setIsSettingsOpen] = useState(false)
  const [isLoadingThread, setIsLoadingThread] = useState(false)
  const [fileWarning, setFileWarning] = useState<string | null>(null)

  const { state, dispatch, handleSend, handleStop, handleReset, handleSendRef } =
    useDebateEngine({ locale, responseLength, maxRounds })

  const persistence = useThreadPersistence()
  const router = useRouter()

  const searchParams = useSearchParams()
  const threadParam = searchParams.get("thread")

  const mainRef = useRef<HTMLElement>(null)
  const [showScrollDown, setShowScrollDown] = useState(false)
  // Bumped on bfcache restore to force framer-motion remount
  const [mountKey, setMountKey] = useState(0)

  // Apply theme classes to <html>
  useEffect(() => {
    const cl = document.documentElement.classList
    cl.remove(...THEMES.filter((t) => t !== "light"))
    const isLightTheme = theme === "light" || theme === "solarized"
    if (!isLightTheme) {
      cl.add("dark")
      if (theme !== "dark") cl.add(theme)
    } else if (theme === "solarized") {
      cl.add("solarized")
    }
  }, [theme])

  // BUG-015: Re-apply theme when page becomes visible again
  // (handles bfcache restore, Next.js client-side back/forward, and tab switching)
  useEffect(() => {
    const reapplyTheme = () => {
      let saved = localStorage.getItem("quorum_theme") as string | null
      if (saved === "github") { saved = "solarized"; localStorage.setItem("quorum_theme", "solarized") }
      if (saved && (THEMES as readonly string[]).includes(saved)) {
        setTheme(saved as Theme)
      }
    }
    const handleVisibility = () => {
      if (document.visibilityState === "visible") reapplyTheme()
    }
    const handlePageShow = (e: PageTransitionEvent) => {
      if (e.persisted) {
        reapplyTheme()
        setMountKey((k) => k + 1)
      }
    }
    document.addEventListener("visibilitychange", handleVisibility)
    window.addEventListener("pageshow", handlePageShow)
    window.addEventListener("focus", reapplyTheme)
    return () => {
      document.removeEventListener("visibilitychange", handleVisibility)
      window.removeEventListener("pageshow", handlePageShow)
      window.removeEventListener("focus", reapplyTheme)
    }
  }, [])

  /* ---- Read config from sessionStorage on mount ---- */
  const initialPromptSent = useRef(false)
  const pendingPrompt = useRef<{ prompt: string; models: Provider[] } | null>(null)
  const [configHydrated, setConfigHydrated] = useState(false)

  useEffect(() => {
    let savedTheme = localStorage.getItem("quorum_theme") as string | null
    if (savedTheme === "github") { savedTheme = "solarized"; localStorage.setItem("quorum_theme", "solarized") }
    if (savedTheme && (THEMES as readonly string[]).includes(savedTheme)) {
      setTheme(savedTheme as Theme)
    }

    const savedLocale = localStorage.getItem("quorum_locale") as string | null
    if (savedLocale === "en" || savedLocale === "ko") {
      setLocale(savedLocale)
    }

    const savedLength = localStorage.getItem("quorum_responseLength") as string | null
    if (savedLength === "short" || savedLength === "medium" || savedLength === "long") {
      setResponseLength(savedLength)
    }

    const savedRounds = localStorage.getItem("quorum_rounds")
    if (savedRounds) {
      const n = parseInt(savedRounds, 10)
      if ([1, 2, 3, 5].includes(n)) setMaxRounds(n)
    }

    const raw = sessionStorage.getItem("quorum_config")
    if (!raw) {
      setConfigHydrated(true)
      return
    }

    try {
      const config = JSON.parse(raw) as {
        prompt?: string
        models?: Provider[]
        responseLength?: ResponseLength
        rounds?: number
        locale?: Locale
      }

      sessionStorage.removeItem("quorum_config")

      const warningsRaw = sessionStorage.getItem("quorum_file_warnings")
      if (warningsRaw) {
        sessionStorage.removeItem("quorum_file_warnings")
        try { setFileWarning(JSON.parse(warningsRaw).join("\n")) } catch { /* ignore */ }
      }

      if (config.models?.length) dispatch({ type: "SET_MODELS", models: config.models })
      if (config.responseLength) setResponseLength(config.responseLength)
      if (config.rounds) setMaxRounds(config.rounds)
      if (config.locale) setLocale(config.locale)

      if (config.prompt) {
        pendingPrompt.current = {
          prompt: config.prompt,
          models: config.models ?? DEFAULT_MODELS,
        }
      }
    } catch {
      // malformed config - ignore
    } finally {
      setConfigHydrated(true)
    }

    const pending = sessionStorage.getItem("quorum_pending")
    if (pending) {
      sessionStorage.removeItem("quorum_pending")
      try {
        const config = JSON.parse(pending)
        if (config.models?.length) dispatch({ type: "SET_MODELS", models: config.models })
        if (config.responseLength) setResponseLength(config.responseLength)
        if (config.rounds) setMaxRounds(config.rounds)
        if (config.locale) setLocale(config.locale)
        if (config.prompt) {
          pendingPrompt.current = {
            prompt: config.prompt,
            models: config.models ?? DEFAULT_MODELS,
          }
        }
      } catch { /* ignore */ }
    }
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  // Fire pending prompt after state has settled
  useEffect(() => {
    if (!configHydrated) return
    if (pendingPrompt.current && !initialPromptSent.current) {
      initialPromptSent.current = true
      const { prompt: p, models } = pendingPrompt.current
      pendingPrompt.current = null
      setTimeout(() => handleSendRef.current(p, "all", models), 0)
    }
  }, [configHydrated, handleSendRef])

  const changeTheme = useCallback((t: Theme) => {
    setTheme(t)
    localStorage.setItem("quorum_theme", t)
  }, [])

  const toggleTheme = useCallback(() => {
    const order = THEMES
    setTheme((prev) => {
      const next = order[(order.indexOf(prev) + 1) % order.length]
      localStorage.setItem("quorum_theme", next)
      return next
    })
  }, [])

  // Persistence-related refs
  const creatingThreadRef = useRef(false)
  const prevMessageCount = useRef(0)
  const isHydratingRef = useRef(false)
  const threadLoaded = useRef<string | null>(null)

  // Auto-save messages when new ones are added
  useEffect(() => {
    if (!persistence.isLoggedIn) return
    if (isHydratingRef.current) {
      prevMessageCount.current = state.messages.length
      return
    }
    if (state.messages.length <= prevMessageCount.current) {
      prevMessageCount.current = state.messages.length
      return
    }
    prevMessageCount.current = state.messages.length

    // If no thread exists yet and we have a user message, create one
    if (!persistence.threadId.current && !creatingThreadRef.current && state.messages.length > 0) {
      const firstUserMsg = state.messages.find(m => m.sender === "user")
      if (firstUserMsg) {
        creatingThreadRef.current = true
        persistence.createThread({
          title: firstUserMsg.content.slice(0, 80),
          models: state.activeModels,
          rounds: maxRounds,
          responseLength,
          locale,
        }).then((id) => {
          creatingThreadRef.current = false
          if (id) {
            dispatch({ type: "SET_THREAD_ID", id })
            // Don't save here — auto-save handles it on next trigger,
            // avoiding saving empty AI placeholders during thread creation.
          }
        })
        return
      }
    }

    // Skip verdict message batch — verdict-save effect handles it sequentially
    if (state.showSummary && state.messages[state.messages.length - 1]?.sender === "verdict") {
      return
    }

    // Don't save while an AI message is still streaming (empty placeholder).
    // The next ADD_MESSAGE trigger will include the now-complete message.
    const lastMsg = state.messages[state.messages.length - 1]
    if (lastMsg && !lastMsg.content && lastMsg.sender !== "user" && lastMsg.sender !== "system" && lastMsg.sender !== "verdict") {
      return
    }

    // Otherwise save incrementally
    persistence.saveMessages(state.messages)
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [state.messages.length])

  // Auto-save verdict when summary is shown (save messages first to avoid version race)
  useEffect(() => {
    if (isHydratingRef.current) return
    if (state.showSummary && state.verdict && persistence.threadId.current) {
      const doSave = async () => {
        await persistence.saveMessages(state.messages)
        const afterIndex = state.messages.length - 1
        await persistence.saveVerdict(state.verdict!, afterIndex)
      }
      doSave()
    }
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [state.showSummary])

  const currentTitle = state.messages.find(m => m.sender === "user")?.content.slice(0, 80) ?? null

  const handleNewDebate = useCallback(() => {
    creatingThreadRef.current = false
    threadLoaded.current = null
    prevMessageCount.current = 0
    persistence.reset()
    handleReset()
    router.replace("/chat")
  }, [persistence, handleReset, router])

  // When user continues a completed thread, mark it active again
  const prevShowSummary = useRef(state.showSummary)
  useEffect(() => {
    if (prevShowSummary.current && !state.showSummary) {
      persistence.continueThread()
    }
    prevShowSummary.current = state.showSummary
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [state.showSummary])

  // Load thread from URL parameter
  useEffect(() => {
    if (!threadParam || threadLoaded.current === threadParam || !persistence.isLoggedIn) return
    threadLoaded.current = threadParam
    creatingThreadRef.current = false
    isHydratingRef.current = true
    prevMessageCount.current = 0
    setIsLoadingThread(true)
    handleReset()
    // Prevent the continue-thread effect from misinterpreting this reset
    // as the user continuing a completed thread
    prevShowSummary.current = false

    persistence.loadThread(threadParam).then((thread) => {
      if (!thread) {
        isHydratingRef.current = false
        threadLoaded.current = null
        setIsLoadingThread(false)
        return
      }

      // Rebuild client messages from DB records
      const messages: Message[] = thread.messages.map((m: { id: string; sender: string; displayName: string; content: string; createdAt: string }) => ({
        id: `db-${m.id}`,
        sender: m.sender as Message["sender"],
        displayName: m.displayName,
        content: m.content,
        timestamp: new Date(m.createdAt),
      }))

      // Inject verdict data into verdict messages
      for (const verdict of thread.verdicts) {
        const verdictMsg = messages.find(
          (m, i) => m.sender === "verdict" && i >= verdict.afterMessageIndex
        )
        if (verdictMsg) {
          verdictMsg.verdictData = {
            recommendedAnswer: verdict.recommendation,
            voteSplit: verdict.voteSplit,
            confidence: verdict.confidence,
            reasons: verdict.reasons,
            minorityView: verdict.minorityView,
            oppositeCase: verdict.oppositeCase,
          }
        }
      }

      // Find the last verdict for the state
      const lastVerdict = thread.verdicts[thread.verdicts.length - 1]
      const verdictResult: VerdictResult | null = lastVerdict
        ? {
            recommendedAnswer: lastVerdict.recommendation,
            voteSplit: lastVerdict.voteSplit,
            confidence: lastVerdict.confidence,
            reasons: lastVerdict.reasons,
            minorityView: lastVerdict.minorityView,
            oppositeCase: lastVerdict.oppositeCase,
          }
        : null

      // Set config from thread
      if (thread.models?.length) dispatch({ type: "SET_MODELS", models: thread.models })
      if (thread.responseLength) setResponseLength(thread.responseLength)
      if (thread.rounds) setMaxRounds(thread.rounds)
      if (thread.locale) setLocale(thread.locale)

      // Hydrate debate engine
      dispatch({
        type: "HYDRATE_THREAD",
        messages,
        verdict: verdictResult,
        showSummary: thread.status === "complete",
      })
      dispatch({ type: "SET_THREAD_ID", id: thread.id })
      prevMessageCount.current = messages.length
      setTimeout(() => { isHydratingRef.current = false; setIsLoadingThread(false) }, 0)
    }).catch((err) => {
      console.error("[thread] Failed to load thread:", err)
      isHydratingRef.current = false
      threadLoaded.current = null
      setIsLoadingThread(false)
    })
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [threadParam, persistence.isLoggedIn, handleReset])

  // Increment free-debate counter after verdict (for login gate)
  const hasIncrementedRef = useRef(false)
  useEffect(() => {
    if (state.showSummary && !persistence.isLoggedIn && !hasIncrementedRef.current) {
      hasIncrementedRef.current = true
      incrementDebateCount()
    }
    if (!state.showSummary) {
      hasIncrementedRef.current = false
    }
  }, [state.showSummary, persistence.isLoggedIn])

  /* ---- Render ---- */

  return (
    <div key={mountKey} className="relative flex flex-col h-screen bg-background overflow-hidden font-[family-name:var(--font-geist-sans)] text-foreground transition-colors duration-200">
      <ChatHeader
        currentRound={state.currentRound}
        maxRounds={maxRounds}
        responseLength={responseLength}
        onChangeResponseLength={(len) => { setResponseLength(len); localStorage.setItem("quorum_responseLength", len) }}
        locale={locale}
        theme={theme}
        onToggleTheme={toggleTheme}
        onOpenSettings={() => setIsSettingsOpen(true)}
        isDebating={state.isDebating}
        threadTitle={currentTitle}
        threadId={state.threadId}
        onNewDebate={handleNewDebate}
        onDeleteCurrent={handleNewDebate}
      />

      <SettingsModal
        isOpen={isSettingsOpen}
        onClose={() => setIsSettingsOpen(false)}
        locale={locale}
        onToggleLocale={() => setLocale((l) => {
          const next = l === "en" ? "ko" : "en"
          localStorage.setItem("quorum_locale", next)
          return next
        })}
        activeModels={state.activeModels}
        onToggleModel={(m) => dispatch({ type: "TOGGLE_MODEL", model: m })}
        maxRounds={maxRounds}
        onChangeRounds={(r) => { setMaxRounds(r); localStorage.setItem("quorum_rounds", String(r)) }}
        isDebating={state.isDebating}
        theme={theme}
        onChangeTheme={changeTheme}
      />

      {/* Scrollable message area */}
      <main
        ref={mainRef}
        className="flex-1 min-h-0 overflow-y-auto relative thin-scrollbar scroll-smooth"
        onScroll={() => {
          const el = mainRef.current
          if (!el) return
          const distFromBottom = el.scrollHeight - el.scrollTop - el.clientHeight
          setShowScrollDown(distFromBottom > 200)
        }}
      >
        {isLoadingThread ? (
          <div className="flex-1 flex items-center justify-center h-full">
            <div className="flex flex-col items-center gap-3">
              <div className="w-5 h-5 border-2 border-zinc-300 dark:border-zinc-600 border-t-zinc-600 dark:border-t-zinc-300 rounded-full animate-spin" />
              <span className="text-sm text-zinc-400 dark:text-zinc-500">
                {locale === "ko" ? "불러오는 중..." : "Loading..."}
              </span>
            </div>
          </div>
        ) : (
          <ChatThread
            messages={state.messages}
            typingModel={state.typingModel}
            locale={locale}
            activeModels={state.activeModels}
            onSendMessage={(text) => handleSend(text, "all")}
            onNewDiscussion={handleNewDebate}
          />
        )}
      </main>

      <AnimatePresence>
        {showScrollDown && (
          <motion.button
            initial={{ opacity: 0, y: 5 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: 5 }}
            onClick={() => mainRef.current?.scrollTo({ top: mainRef.current.scrollHeight, behavior: "smooth" })}
            className="absolute left-1/2 -translate-x-1/2 bottom-20 sm:bottom-24 w-8 h-8 rounded-full bg-zinc-500/20 dark:bg-zinc-400/15 backdrop-blur-sm text-zinc-500 dark:text-zinc-400 flex items-center justify-center hover:bg-zinc-500/30 dark:hover:bg-zinc-400/25 transition-colors z-30"
          >
            <ChevronDown className="w-4 h-4" />
          </motion.button>
        )}
      </AnimatePresence>

      {/* Bottom bar: consensus rail + input */}
      <div className="w-full shrink-0 bg-gradient-to-t from-[var(--background)] via-[var(--background)] to-transparent pt-4 z-10">
        <AnimatePresence>
          {(state.isDebating || state.typingModel !== null || state.verdict !== null) && (
            <ConsensusMeter
              score={state.verdict?.confidence ?? null}
              result={state.showSummary ? state.verdict : null}
              locale={locale}
            />
          )}
        </AnimatePresence>

        <MessageInput
          onSend={handleSend}
          onStop={handleStop}
          disabled={state.isDebating}
          locale={locale}
          initialFileWarning={fileWarning}
        />
      </div>
    </div>
  )
}