// apps/mobile/app/(tabs)/dash.tsx
// Dashboard tab — session stats, usage, system status
// Design ref: docs/v3/designs/dashboard.html

import { View, ScrollView, StyleSheet } from 'react-native'
import { useSafeAreaInsets } from 'react-native-safe-area-context'
import {
  MetalCard,
  PhosphorText,
  Led,
  ScreenPanel,
  AppStatusBar,
  Header,
  d3roNativePalette
} from '@d3ro/ui-native'
import { useI18n } from '@d3ro/i18n'

export default function DashScreen(): React.ReactElement {
  const insets = useSafeAreaInsets()
  const { t } = useI18n()

  return (
    <ScrollView
      style={styles.container}
      contentContainerStyle={[styles.content, { paddingBottom: insets.bottom + 100 }]}
    >
      <Header title={t('mobile.dash.title')} showBorder={false} paddingTop={insets.top} />

      {/* Session Overview — InsetPanel */}
      <ScreenPanel style={styles.overviewPanel}>
        <PhosphorText variant="small" color="muted" style={styles.sectionLabel}>
          {t('mobile.dash.sessionOverview')}
        </PhosphorText>
        <View style={styles.bigNumber}>
          <PhosphorText variant="hero" color="amber">0</PhosphorText>
          <PhosphorText variant="body" color="muted" style={styles.todayLabel}>
            {t('mobile.dash.today')}
          </PhosphorText>
        </View>
        <PhosphorText variant="small" color="muted" style={styles.guideText}>
          {t('mobile.dash.tapToRecord')}
        </PhosphorText>
        <View style={styles.overviewFooter}>
          <View>
            <PhosphorText variant="label" color="muted">{t('mobile.dash.words')}</PhosphorText>
            <PhosphorText variant="value" color="amber">0</PhosphorText>
          </View>
          <View style={styles.alignEnd}>
            <PhosphorText variant="label" color="muted">{t('mobile.dash.streak')}</PhosphorText>
            <PhosphorText variant="value" color="amber">0</PhosphorText>
          </View>
        </View>
      </ScreenPanel>

      {/* 2x2 Stats Grid */}
      <View style={styles.statsGrid}>
        <MetalCard style={styles.statCard}>
          <PhosphorText variant="label" color="muted">{t('mobile.dash.rec')}</PhosphorText>
          <PhosphorText variant="value" color="amber">0</PhosphorText>
          <PhosphorText variant="label" color="muted">{t('mobile.dash.min')}</PhosphorText>
        </MetalCard>
        <MetalCard style={styles.statCard}>
          <PhosphorText variant="label" color="muted">{t('mobile.dash.words')}</PhosphorText>
          <PhosphorText variant="value" color="amber">0</PhosphorText>
        </MetalCard>
        <MetalCard style={styles.statCard}>
          <PhosphorText variant="label" color="muted">{t('mobile.dash.today')}</PhosphorText>
          <PhosphorText variant="value" color="amber">0</PhosphorText>
        </MetalCard>
        <MetalCard style={styles.statCard}>
          <PhosphorText variant="label" color="muted">{t('mobile.dash.streak')}</PhosphorText>
          <PhosphorText variant="value" color="amber">0</PhosphorText>
        </MetalCard>
      </View>

      {/* Backend Info */}
      <MetalCard style={styles.infoCard}>
        <PhosphorText variant="small" color="muted">{t('mobile.dash.backend')}</PhosphorText>
        <View style={styles.infoRow}>
          <Led color="green" size={6} />
          <PhosphorText variant="body" color="amber" style={styles.infoValue}>
            CLOUD (CLAUDE)
          </PhosphorText>
        </View>
      </MetalCard>

      <MetalCard style={styles.infoCard}>
        <PhosphorText variant="small" color="muted">{t('mobile.dash.tier')}</PhosphorText>
        <View style={styles.infoRow}>
          <Led color="amber" size={6} />
          <PhosphorText variant="body" color="amber" style={styles.infoValue}>
            {t('mobile.dash.free')}
          </PhosphorText>
        </View>
      </MetalCard>

      {/* Usage */}
      <PhosphorText variant="label" color="muted" style={styles.usageTitle}>
        {t('mobile.dash.usage')}
      </PhosphorText>
      <MetalCard style={styles.usageCard}>
        <UsageRow label={t('mobile.dash.dictation')} value={t('mobile.dash.unlimited')} />
        <View style={styles.usageDivider} />
        <UsageRow label={t('mobile.dash.llmProcess')} value={t('mobile.dash.unlimited')} />
        <View style={styles.usageDivider} />
        <UsageRow label={t('mobile.dash.premiumQuota')} value="250 / 500" progress={0.5} />
      </MetalCard>

      <AppStatusBar />
    </ScrollView>
  )
}

function UsageRow({
  label,
  value,
  progress
}: {
  label: string
  value: string
  progress?: number
}): React.ReactElement {
  return (
    <View style={styles.usageRow}>
      <PhosphorText variant="body" color="primary">{label}</PhosphorText>
      <View style={styles.usageRight}>
        <PhosphorText variant="small" color="amber">{value}</PhosphorText>
        {progress != null && (
          <View style={styles.progressBar}>
            <View style={[styles.progressFill, { width: `${progress * 100}%` }]} />
          </View>
        )}
      </View>
    </View>
  )
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: d3roNativePalette.bg.app },
  content: { paddingHorizontal: 20 },
  overviewPanel: { marginBottom: 12 },
  sectionLabel: { marginBottom: 16 },
  bigNumber: { flexDirection: 'row', alignItems: 'baseline', marginBottom: 8 },
  todayLabel: { marginLeft: 12 },
  guideText: { marginBottom: 20 },
  overviewFooter: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    borderTopWidth: 1,
    borderTopColor: d3roNativePalette.border.subtle,
    paddingTop: 12
  },
  alignEnd: { alignItems: 'flex-end' },
  statsGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 12,
    marginBottom: 12
  },
  statCard: {
    width: '47%' as unknown as number,
    alignItems: 'center',
    paddingVertical: 16,
    gap: 4
  },
  infoCard: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 12,
    paddingVertical: 14
  },
  infoRow: { flexDirection: 'row', alignItems: 'center' },
  infoValue: { marginLeft: 8 },
  usageTitle: { letterSpacing: 3, marginBottom: 8, marginLeft: 4 },
  usageCard: { marginBottom: 12, padding: 0, overflow: 'hidden' },
  usageRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    padding: 16
  },
  usageRight: { alignItems: 'flex-end', gap: 4 },
  usageDivider: { height: 1, backgroundColor: d3roNativePalette.border.subtle },
  progressBar: {
    width: 80,
    height: 4,
    backgroundColor: d3roNativePalette.bg.inset,
    borderRadius: 2,
    overflow: 'hidden'
  },
  progressFill: {
    height: '100%' as unknown as number,
    backgroundColor: d3roNativePalette.accent.green,
    borderRadius: 2
  }
})