// apps/mobile/app/(tabs)/record.tsx
// 녹음 탭 — expo-av 기반 녹음 + STT 파이프라인
// Phase M-2에서 디자인(docs/v3/designs/recording.html) 정밀 적용

import { useState, useRef } from 'react'
import { View, StyleSheet, ActivityIndicator, ScrollView } from 'react-native'
import { useSafeAreaInsets } from 'react-native-safe-area-context'
import { Audio } from 'expo-av'
import Constants from 'expo-constants'
import {
  MetalCard,
  PhosphorText,
  PhysicalButton,
  Led,
  d3roNativePalette
} from '@d3ro/ui-native'
import { supabase, isSupabaseConfigured } from '../../lib/supabase'

type RecordingState = 'idle' | 'recording' | 'processing' | 'done' | 'error'

export default function RecordScreen(): React.ReactElement {
  const insets = useSafeAreaInsets()
  const [state, setState] = useState<RecordingState>('idle')
  const [transcript, setTranscript] = useState<string>('')
  const [error, setError] = useState<string | null>(null)
  const [duration, setDuration] = useState(0)
  const recordingRef = useRef<Audio.Recording | null>(null)
  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null)

  async function startRecording(): Promise<void> {
    setError(null)
    setTranscript('')
    setDuration(0)

    try {
      const perm = await Audio.requestPermissionsAsync()
      if (perm.status !== 'granted') {
        setError('Microphone permission denied')
        setState('error')
        return
      }

      await Audio.setAudioModeAsync({
        allowsRecordingIOS: true,
        playsInSilentModeIOS: true
      })

      const recording = new Audio.Recording()
      await recording.prepareToRecordAsync(Audio.RecordingOptionsPresets.HIGH_QUALITY)
      await recording.startAsync()
      recordingRef.current = recording
      setState('recording')

      timerRef.current = setInterval(() => {
        setDuration((d) => d + 1)
      }, 1000)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Failed to start')
      setState('error')
    }
  }

  async function stopRecording(): Promise<void> {
    if (!recordingRef.current) return
    if (timerRef.current) {
      clearInterval(timerRef.current)
      timerRef.current = null
    }
    setState('processing')

    try {
      await recordingRef.current.stopAndUnloadAsync()
      const uri = recordingRef.current.getURI()
      recordingRef.current = null

      if (!uri) {
        throw new Error('No recording URI')
      }

      if (!isSupabaseConfigured()) {
        setError('Supabase not configured')
        setState('error')
        return
      }

      const { data: { session } } = await supabase.auth.getSession()
      if (!session) {
        setError('Login required')
        setState('error')
        return
      }

      const formData = new FormData()
      formData.append('audio', {
        uri,
        name: 'recording.m4a',
        type: 'audio/m4a'
      } as unknown as Blob)
      formData.append('language_code', 'ko-KR')

      const url = (Constants.expoConfig?.extra?.supabaseUrl as string) ?? ''
      const response = await fetch(`${url}/functions/v1/stt-proxy`, {
        method: 'POST',
        headers: { Authorization: `Bearer ${session.access_token}` },
        body: formData
      })

      if (!response.ok) {
        throw new Error(`STT failed: ${response.status}`)
      }

      const result = (await response.json()) as { transcript: string }
      setTranscript(result.transcript)
      setState('done')
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unknown error')
      setState('error')
    }
  }

  async function cancelRecording(): Promise<void> {
    if (timerRef.current) {
      clearInterval(timerRef.current)
      timerRef.current = null
    }
    if (recordingRef.current) {
      try { await recordingRef.current.stopAndUnloadAsync() } catch { /* ignore */ }
      recordingRef.current = null
    }
    setState('idle')
    setTranscript('')
    setError(null)
    setDuration(0)
  }

  const formatTime = (s: number): string => {
    const m = Math.floor(s / 60)
    const sec = s % 60
    return `${String(m).padStart(2, '0')}:${String(sec).padStart(2, '0')}`
  }

  return (
    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
      {/* Header */}
      <View style={[styles.header, { paddingTop: insets.top + 8 }]}>
        <View style={styles.headerLeft}>
          <Led color="amber" size={8} on={state === 'recording'} />
          <PhosphorText
            variant="label"
            color={state === 'recording' ? 'amber' : 'muted'}
            style={{ letterSpacing: 3 }}
          >
            {state === 'recording' ? 'REC_SESSION' : 'RECORDER'}
          </PhosphorText>
        </View>
        {state === 'recording' && (
          <PhosphorText variant="label" color="amber">
            {formatTime(duration)}
          </PhosphorText>
        )}
      </View>

      {/* Wave Bars Placeholder */}
      {state === 'recording' && (
        <View style={styles.waveContainer}>
          {Array.from({ length: 11 }).map((_, i) => (
            <View
              key={i}
              style={[
                styles.waveBar,
                { height: 8 + Math.random() * 24 }
              ]}
            />
          ))}
        </View>
      )}

      <MetalCard style={styles.card}>
        <View style={styles.statusRow}>
          <Led
            color={
              state === 'recording' ? 'red'
                : state === 'processing' ? 'orange'
                  : state === 'done' ? 'green'
                    : 'amber'
            }
            size={10}
            on={state !== 'idle'}
          />
          <PhosphorText variant="label" color="label" style={styles.statusLabel}>
            {state === 'recording' ? 'RECORDING'
              : state === 'processing' ? 'PROCESSING'
                : state === 'done' ? 'DONE'
                  : state === 'error' ? 'ERROR'
                    : 'READY'}
          </PhosphorText>
        </View>

        <View style={styles.center}>
          {state === 'processing' && (
            <ActivityIndicator size="large" color={d3roNativePalette.accent.amber} />
          )}

          {transcript && state === 'done' && (
            <View style={styles.transcriptBox}>
              <PhosphorText variant="body" color="primary">
                {transcript}
              </PhosphorText>
            </View>
          )}

          {error && (
            <View style={styles.errorBox}>
              <PhosphorText variant="small" color="label">
                {error}
              </PhosphorText>
            </View>
          )}
        </View>

        <View style={styles.buttons}>
          {(state === 'idle' || state === 'done' || state === 'error') && (
            <PhysicalButton
              label={state === 'done' ? 'NEW RECORDING' : 'START RECORDING'}
              variant="primary"
              onPress={() => void startRecording()}
            />
          )}
          {state === 'recording' && (
            <>
              <PhysicalButton label="STOP" variant="danger" onPress={() => void stopRecording()} />
              <View style={{ height: 12 }} />
              <PhysicalButton
                label="CANCEL"
                variant="secondary"
                onPress={() => void cancelRecording()}
              />
            </>
          )}
        </View>
      </MetalCard>
    </ScrollView>
  )
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: d3roNativePalette.bg.app },
  content: { paddingBottom: 100 },
  header: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    paddingHorizontal: 20,
    paddingBottom: 12,
    borderBottomWidth: 1,
    borderBottomColor: 'rgba(46, 46, 50, 0.5)'
  },
  headerLeft: { flexDirection: 'row', alignItems: 'center', gap: 8 },
  waveContainer: {
    height: 128,
    backgroundColor: d3roNativePalette.bg.inset,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: 6,
    borderBottomWidth: 1,
    borderBottomColor: 'rgba(26, 26, 28, 1)'
  },
  waveBar: {
    width: 6,
    backgroundColor: d3roNativePalette.accent.amber,
    borderRadius: 3
  },
  card: { margin: 20, padding: 24 },
  statusRow: { flexDirection: 'row', alignItems: 'center' },
  statusLabel: { marginLeft: 8 },
  center: { alignItems: 'center', minHeight: 140, justifyContent: 'center', marginVertical: 16 },
  transcriptBox: {
    backgroundColor: d3roNativePalette.bg.inset,
    padding: 12,
    borderRadius: 8,
    width: '100%',
    marginTop: 8
  },
  errorBox: {
    borderWidth: 1,
    borderColor: d3roNativePalette.tag.red,
    padding: 10,
    borderRadius: 6,
    width: '100%',
    marginTop: 8
  },
  buttons: { marginTop: 16 }
})