// src/renderer/pages/DashboardPage.tsx
// 레퍼런스(Meteorological Instrument) 스타일 대시보드:
// ScreenPanel 히어로 + 스탯 카드 + CRT 서비스 상태 + 히스토리

import { useState, useEffect, useCallback, useMemo, useRef } from 'react'
import { Box } from '@mui/material'
import { CrtDisplay, InstrumentPanel, Led, MetalCard, PhosphorText, ScreenPanel, ButtonGroup, PhysicalButton } from '../components/ds'
import { EmptyStateCard, HistoryEntryCard } from '../components/shared'
import { d3roPalette, d3roTypo } from '../theme'
import { useI18n } from '../i18n'
import { formatRecordingTime, formatRecordingTimeUnit, formatNumber, getDateKey } from '../utils/formatters'
import { FileDropZone } from '../components/FileDropZone'
import type { StatsSummary, HistoryEntry, HotkeyBinding, CaptionState, LicenseTier, UsageQuota } from '@shared/types'

// ── 메인 컴포넌트 ─────────────────────────────────────

export function DashboardPage(): React.ReactElement {
  const { t, formatTime, formatRelativeDate } = useI18n()
  const [stats, setStats] = useState<StatsSummary | null>(null)
  const [history, setHistory] = useState<HistoryEntry[]>([])
  const [ollamaConnected, setOllamaConnected] = useState(false)
  const [dictationBinding, setDictationBinding] = useState<HotkeyBinding | null>(null)
  const [activeView, setActiveView] = useState<'stats' | 'status'>('stats')
  const [captionState, setCaptionState] = useState<CaptionState>('inactive')
  const [audioLevel, setAudioLevel] = useState(0)
  const audioDecayRef = useRef<ReturnType<typeof setInterval> | null>(null)
  const [licenseTier, setLicenseTier] = useState<LicenseTier>('free')
  const [usageQuotas, setUsageQuotas] = useState<UsageQuota[]>([])

  const loadData = useCallback(() => {
    window.electronAPI.stats.getSummary().then((r) => {
      if (r.success) setStats(r.data)
    })
    window.electronAPI.llm.getStatus().then((r) => {
      if (r.success) setOllamaConnected(r.data.connectionState === 'connected')
    })
    window.electronAPI.history.getAll({ page: 0, pageSize: 10, sortOrder: 'desc' }).then((r) => {
      if (r.success) setHistory(r.data.entries)
    })
    window.electronAPI.hotkey.getDictationShortcut().then((r) => {
      if (r.success && r.data) setDictationBinding(r.data)
    })
    window.electronAPI.caption.getState().then((r) => {
      if (r.success) setCaptionState(r.data)
    })
    window.electronAPI.license.getInfo().then((r) => {
      if (r.success) setLicenseTier(r.data.tier)
    })
    window.electronAPI.license.getAllUsage().then((r) => {
      if (r.success) setUsageQuotas(r.data)
    })
  }, [])

  useEffect(() => {
    loadData()
    const interval = setInterval(loadData, 30000)
    const unsub = window.electronAPI.app.onDataChanged(() => { loadData() })
    const unsubCaption = window.electronAPI.caption.onStateChanged((state) => {
      setCaptionState(state)
    })
    const unsubAudio = window.electronAPI.voice.onAudioLevel((e) => {
      setAudioLevel(e.level)
    })
    // 오디오 이벤트가 없을 때 서서히 감쇠
    audioDecayRef.current = setInterval(() => {
      setAudioLevel(prev => prev > 0.01 ? prev * 0.85 : 0)
    }, 100)
    return () => {
      clearInterval(interval)
      if (audioDecayRef.current) clearInterval(audioDecayRef.current)
      unsub(); unsubCaption(); unsubAudio()
    }
  }, [loadData])

  // 날짜별 그룹핑
  const groupedHistory = useMemo(() => {
    const groups: Record<string, { label: string; entries: HistoryEntry[] }> = {}
    for (const entry of history) {
      const key = getDateKey(entry.createdAt)
      if (!groups[key]) {
        groups[key] = { label: formatRelativeDate(entry.createdAt), entries: [] }
      }
      groups[key].entries.push(entry)
    }
    return Object.values(groups)
  }, [history, formatRelativeDate])

  const services = useMemo(() => [
    { name: t('service.sttEngine'), status: t('service.ready'), ok: true },
    { name: t('service.ollamaLlm'), status: ollamaConnected ? t('service.connected') : t('service.offline'), ok: ollamaConnected },
    { name: t('service.hotkeyHook'), status: t('service.active'), ok: true },
    { name: t('service.audioInput'), status: t('service.standby'), ok: true },
  ], [t, ollamaConnected])

  return (
    <Box sx={{ maxWidth: 900, mx: 'auto', p: 4, pb: 8 }}>
      {/* ── 1. 인스트루먼트 패널: 스크린 + 스탯 + 버튼 그리드 ── */}
      <InstrumentPanel
        engravingLeft="D3RO-VOICE"
        engravingRight="v1.0.0"
        engravingBottom="LOCAL AI VOICE ASSISTANT"
      >
        <Box
          sx={{
            display: 'grid',
            gridTemplateColumns: '1fr 180px',
            gap: 2.5,
            alignItems: 'stretch',
          }}
        >
          {/* 좌측: 스크린 디스플레이 (레퍼런스의 .display-module) */}
          <ScreenPanel height={200}>
            {/* 상단 라벨 */}
            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline' }}>
              <PhosphorText variant="label">
                {activeView === 'stats'
                  ? t('dashboard.sessionOverview').toUpperCase()
                  : t('dashboard.systemStatus').toUpperCase()}
              </PhosphorText>
              <PhosphorText variant="label">
                {new Date().toLocaleDateString('en-US', { weekday: 'short' }).toUpperCase()}
              </PhosphorText>
            </Box>

            {/* 중앙: 큰 수치 or 서비스 상태 */}
            <Box sx={{ flex: 1, display: 'flex', flexDirection: 'column', justifyContent: 'center' }}>
              {activeView === 'stats' ? (
                <>
                  <Box sx={{ display: 'flex', alignItems: 'baseline', gap: 0.5 }}>
                    <PhosphorText variant="hero">
                      {stats?.todaySessionCount ?? 0}
                    </PhosphorText>
                    <PhosphorText variant="label" sx={{ color: d3roPalette.text.dimLabel }}>
                      {t('dashboard.sessionsToday').toUpperCase()}
                    </PhosphorText>
                  </Box>
                  <PhosphorText variant="label" sx={{ mt: 0.5, color: d3roPalette.text.dimLabel }}>
                    {dictationBinding
                      ? t('dashboard.pressToRecord', { key: dictationBinding.displayLabel.toUpperCase() }).toUpperCase()
                      : t('dashboard.hotkeyNotSet').toUpperCase()}
                  </PhosphorText>
                </>
              ) : (
                <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
                  {services.map((svc) => (
                    <Box key={svc.name} sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                      <Led color={svc.ok ? 'green' : 'red'} size={6} />
                      <PhosphorText variant="label" sx={{ flex: 1 }}>{svc.name}</PhosphorText>
                      <PhosphorText
                        variant="value"
                        sx={{ fontSize: d3roTypo.meta.size, color: svc.ok ? d3roPalette.accent.amber : d3roPalette.tag.red }}
                      >
                        {svc.status}
                      </PhosphorText>
                    </Box>
                  ))}
                </Box>
              )}
            </Box>

            {/* 하단: 보조 수치 (레퍼런스의 .screen-bottom) */}
            {activeView === 'stats' && (
              <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline' }}>
                <Box>
                  <PhosphorText variant="label">{t('dashboard.words').toUpperCase()}</PhosphorText>
                  <Box sx={{ display: 'flex', alignItems: 'baseline', gap: 0.5 }}>
                    <PhosphorText variant="value">
                      {formatNumber(stats?.totalWordCount ?? 0)}
                    </PhosphorText>
                    <PhosphorText variant="label" sx={{ color: d3roPalette.text.dimLabel }}>
                      {t('dashboard.total').toUpperCase()}
                    </PhosphorText>
                  </Box>
                </Box>
                <Box sx={{ textAlign: 'right' }}>
                  <PhosphorText variant="label">{t('dashboard.streak').toUpperCase()}</PhosphorText>
                  <Box sx={{ display: 'flex', alignItems: 'baseline', gap: 0.5, justifyContent: 'flex-end' }}>
                    <PhosphorText variant="value">
                      {stats?.streakDays ?? 0}
                    </PhosphorText>
                    <PhosphorText variant="label" sx={{ color: d3roPalette.text.dimLabel }}>
                      {t('dashboard.days').toUpperCase()}
                    </PhosphorText>
                  </Box>
                </Box>
              </Box>
            )}
          </ScreenPanel>

          {/* 우측: 컨트롤 패널 */}
          <Box sx={{ display: 'flex', flexDirection: 'column', justifyContent: 'space-between' }}>
            {/* LED 상태 클러스터 */}
            <Box sx={{ display: 'flex', justifyContent: 'flex-end', gap: 1, pt: 1 }}>
              <Led color={ollamaConnected ? 'green' : 'red'} size={8} />
              <Led color="amber" pulse size={8} />
            </Box>

            {/* 버튼 그룹 */}
            <ButtonGroup>
              <PhysicalButton
                selected={activeView === 'stats'}
                onClick={() => setActiveView('stats')}
                sx={{ minWidth: 0 }}
              >
                {t('dashboard.stat').toUpperCase()}
              </PhysicalButton>
              <PhysicalButton
                selected={activeView === 'status'}
                onClick={() => setActiveView('status')}
                sx={{ minWidth: 0 }}
              >
                {t('dashboard.sys').toUpperCase()}
              </PhysicalButton>
            </ButtonGroup>
          </Box>
        </Box>
      </InstrumentPanel>

      {/* ── 2. 통계 카드 (인스트루먼트 패널 아래) ──── */}
      <Box
        sx={{
          display: 'grid',
          gridTemplateColumns: 'repeat(4, 1fr)',
          gap: 2,
          mt: 3,
        }}
      >
        {[
          { label: t('dashboard.recording').toUpperCase(), value: formatRecordingTime(stats?.totalRecordingTimeMs ?? 0), unit: formatRecordingTimeUnit(stats?.totalRecordingTimeMs ?? 0) },
          { label: t('dashboard.words').toUpperCase(), value: formatNumber(stats?.totalWordCount ?? 0), unit: t('dashboard.total').toUpperCase() },
          { label: t('dashboard.today').toUpperCase(), value: `${stats?.todaySessionCount ?? 0}`, unit: t('dashboard.sessions').toUpperCase() },
          { label: t('dashboard.streak').toUpperCase(), value: `${stats?.streakDays ?? 0}`, unit: t('dashboard.days').toUpperCase() },
        ].map((card) => (
          <MetalCard key={card.label}>
            <Box sx={{ textAlign: 'center', py: 1 }}>
              <PhosphorText variant="label" sx={{ mb: 1, display: 'block' }}>
                {card.label}
              </PhosphorText>
              <Box sx={{ display: 'flex', alignItems: 'baseline', justifyContent: 'center', gap: 0.5 }}>
                <PhosphorText variant="value" sx={{ fontSize: d3roTypo.title.size, fontWeight: 300 }}>
                  {card.value}
                </PhosphorText>
                <PhosphorText variant="dim" sx={{ fontSize: d3roTypo.small.size }}>
                  {card.unit}
                </PhosphorText>
              </Box>
            </Box>
          </MetalCard>
        ))}
      </Box>

      {/* ── 2.4. 사용량 바 (Free 티어) ─────────────── */}
      {licenseTier === 'free' && usageQuotas.length > 0 && (
        <Box sx={{ mt: 2 }}>
          <MetalCard>
            <Box sx={{ px: 1, py: 0.5 }}>
              <PhosphorText variant="label" sx={{ mb: 1, display: 'block' }}>
                {t('license.usageToday').toUpperCase()}
              </PhosphorText>
              {usageQuotas.map((q) => (
                <Box key={q.feature} sx={{ mb: 1 }}>
                  <Box sx={{ display: 'flex', justifyContent: 'space-between', mb: 0.3 }}>
                    <PhosphorText variant="small">
                      {t(`license.feature.${q.feature}`)}
                    </PhosphorText>
                    <PhosphorText variant="small" sx={{ color: q.remaining === 0 ? d3roPalette.tag.red : d3roPalette.accent.amber }}>
                      {q.limit === -1
                        ? t('license.unlimited')
                        : `${q.used}/${q.limit}`}
                    </PhosphorText>
                  </Box>
                  {q.limit > 0 && (
                    <Box sx={{
                      height: 3,
                      borderRadius: '2px',
                      bgcolor: d3roPalette.bg.inset,
                      overflow: 'hidden',
                    }}>
                      <Box sx={{
                        height: '100%',
                        width: `${Math.min(100, (q.used / q.limit) * 100)}%`,
                        bgcolor: q.used >= q.limit ? d3roPalette.tag.red : d3roPalette.accent.amber,
                        borderRadius: '2px',
                        transition: 'width 0.3s ease',
                      }} />
                    </Box>
                  )}
                </Box>
              ))}
            </Box>
          </MetalCard>
        </Box>
      )}

      {/* ── 2.5. 실시간 자막 토글 ────────────────── */}
      <Box sx={{ mt: 3 }}>
        <MetalCard>
          <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
            <Box sx={{ display: 'flex', alignItems: 'center', gap: 1.5 }}>
              <Led
                color={captionState === 'active' ? 'green' : captionState === 'starting' || captionState === 'stopping' ? 'amber' : 'off'}
                size={8}
                pulse={captionState === 'active'}
              />
              <Box>
                <PhosphorText variant="body" sx={{ fontWeight: d3roTypo.heading.weight }}>
                  {t('dashboard.caption').toUpperCase()}
                </PhosphorText>
                {captionState === 'active' && (
                  <PhosphorText variant="dim" sx={{ fontSize: d3roTypo.micro.size, color: d3roPalette.tag.green }}>
                    {t('dashboard.captionActive').toUpperCase()}
                  </PhosphorText>
                )}
              </Box>
            </Box>
            <PhysicalButton
              selected={captionState === 'active'}
              onClick={async () => {
                if (captionState === 'active') {
                  await window.electronAPI.caption.stop()
                } else if (captionState === 'inactive') {
                  await window.electronAPI.caption.start()
                }
              }}
              sx={{ minWidth: 100 }}
            >
              {captionState === 'active' ? t('dashboard.captionStop').toUpperCase() : t('dashboard.captionStart').toUpperCase()}
            </PhysicalButton>
          </Box>
        </MetalCard>
      </Box>

      {/* ── 3. CRT 서비스 상태 (컴팩트) ────────────── */}
      <Box sx={{ mt: 3 }}>
        <CrtDisplay amplitude={0.05} frequency={6} height={100} audioLevel={audioLevel}>
          <Box sx={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 1, px: 1 }}>
            {services.map((svc) => (
              <Box key={svc.name} sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                <Led color={svc.ok ? 'green' : 'red'} size={6} />
                <PhosphorText variant="label" sx={{ flex: 1 }}>{svc.name}</PhosphorText>
                <PhosphorText
                  variant="value"
                  sx={{ fontSize: d3roTypo.meta.size, color: svc.ok ? d3roPalette.accent.amber : d3roPalette.tag.red }}
                >
                  {svc.status}
                </PhosphorText>
              </Box>
            ))}
          </Box>
        </CrtDisplay>
      </Box>

      {/* ── 3.5 파일 전사 (Phase 12.1) ──────────────── */}
      <Box sx={{ mt: 3 }}>
        <PhosphorText variant="label" sx={{ mb: 1.5, display: 'block', color: d3roPalette.text.inactive }}>
          {t('fileTranscription.title').toUpperCase()}
        </PhosphorText>
        <FileDropZone />
      </Box>

      {/* ── 4. 최근 히스토리 ──────────────────────── */}
      <Box sx={{ mt: 4 }}>
        <PhosphorText variant="label" sx={{ mb: 2, display: 'block', color: d3roPalette.text.inactive }}>
          {t('dashboard.recentTranscriptions').toUpperCase()}
        </PhosphorText>

        {history.length === 0 ? (
          <EmptyStateCard message={t('dashboard.noHistory')} />
        ) : (
          groupedHistory.map((group) => (
            <Box key={group.label} sx={{ mb: 3 }}>
              {/* 날짜 구분자 */}
              <Box sx={{ display: 'flex', alignItems: 'center', gap: 2, mb: 1.5 }}>
                <PhosphorText variant="label" sx={{ color: d3roPalette.text.dimLabel, whiteSpace: 'nowrap' }}>
                  {group.label}
                </PhosphorText>
                <Box sx={{ flex: 1, height: '1px', bgcolor: d3roPalette.border.subtle }} />
                <PhosphorText variant="dim" sx={{ fontSize: d3roTypo.label.size }}>
                  {t('dashboard.entries', { count: group.entries.length })}
                </PhosphorText>
              </Box>

              {/* 히스토리 항목 */}
              <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
                {group.entries.map((entry) => (
                  <HistoryEntryCard
                    key={entry.id}
                    entry={entry}
                    onCopy={(text) => navigator.clipboard.writeText(text)}
                  />
                ))}
              </Box>
            </Box>
          ))
        )}
      </Box>
    </Box>
  )
}