import { useMemo } from 'react';
import { Text, View } from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { useTranslation } from 'react-i18next';
import { useColors } from '../../lib/theme';
import { FormSheet } from '../FormSheet';
import { HalfDonut } from '../common/HalfDonut';
import { useProtectionCoverage } from '../../hooks/useProfileData';

const PROTECTED_COLOR = '#22c55e';
const UNPROTECTED_COLOR = '#e5e5e5';
const DONUT_WIDTH = 200;
const DAY_MS = 86_400_000;

export type DeviceDetail = {
  name: string;
  icon: React.ComponentProps<typeof Ionicons>['name'];
  platform: string;
  /** ISO — Bindungs-/Verbindungsdatum */
  createdAt: string;
  lastSeenAt?: string | null;
  statusLabel: string;
  statusColor: string;
};

function fmtDate(iso: string): string {
  return new Date(iso).toLocaleDateString(undefined, {
    day: '2-digit',
    month: 'short',
    year: 'numeric',
  });
}

function fmtLastSeen(iso: string, t: (k: string, o?: any) => string): string {
  const min = Math.floor((Date.now() - new Date(iso).getTime()) / 60_000);
  if (min < 1) return t('settings.devices_just_now');
  if (min < 60) return t('settings.devices_mins_ago', { count: min });
  const hr = Math.floor(min / 60);
  if (hr < 24) return t('settings.devices_hours_ago', { count: hr });
  const day = Math.floor(hr / 24);
  if (day < 30) return t('settings.devices_days_ago', { count: day });
  return fmtDate(iso);
}

/**
 * DeviceDetailSheet — Detail-Ansicht beim Tap auf eine Geräte-Row.
 *
 * Zeigt Verbindungsstatus, Bindungs-Datum und den Schutz-Verlauf als
 * HalfDonut (geschützt vs. ungeschützt) — gleiche Visualisierung wie auf der
 * Profile-Page. Per-Gerät-Split wird client-side berechnet:
 *   geschützt   = volle Tage seit Bindung dieses Geräts
 *   ungeschützt = Account-Schutzalter, das VOR der Bindung lag
 * → echte gerätespezifische Verteilung + Progress, ohne neuen Backend-Endpoint.
 */
export function DeviceDetailSheet({
  visible,
  device,
  onClose,
}: {
  visible: boolean;
  device: DeviceDetail | null;
  onClose: () => void;
}) {
  const { t } = useTranslation();
  const colors = useColors();
  const { coverage } = useProtectionCoverage();

  const { protectedDays, unprotectedDays } = useMemo(() => {
    if (!device) return { protectedDays: 0, unprotectedDays: 0 };
    const boundAt = new Date(device.createdAt).getTime();
    const devProtected = Math.max(0, Math.floor((Date.now() - boundAt) / DAY_MS));
    const accountSpan = coverage
      ? coverage.protectedDays + coverage.unprotectedDays
      : devProtected;
    const before = Math.max(0, accountSpan - devProtected);
    return { protectedDays: devProtected, unprotectedDays: before };
  }, [device, coverage]);

  const segments = useMemo(
    () => [
      { value: Math.max(protectedDays, 1), color: PROTECTED_COLOR },
      { value: Math.max(unprotectedDays, 0), color: UNPROTECTED_COLOR },
    ],
    [protectedDays, unprotectedDays],
  );

  return (
    <FormSheet
      visible={visible}
      onClose={onClose}
      title={device?.name ?? ''}
      initialHeightPct={0.6}
      growWithKeyboard={false}
    >
      {device && (
        <View style={{ paddingHorizontal: 20, paddingTop: 4, paddingBottom: 24, gap: 20 }}>
          {/* Identität */}
          <View style={{ flexDirection: 'row', alignItems: 'center', gap: 12 }}>
            <View
              style={{
                width: 48,
                height: 48,
                borderRadius: 14,
                backgroundColor: colors.surfaceElevated,
                alignItems: 'center',
                justifyContent: 'center',
              }}
            >
              <Ionicons name={device.icon} size={24} color={colors.text} />
            </View>
            <View style={{ flex: 1, minWidth: 0 }}>
              <Text
                numberOfLines={1}
                style={{ fontSize: 17, color: colors.text, fontFamily: 'Nunito_700Bold' }}
              >
                {device.name}
              </Text>
              <View style={{ flexDirection: 'row', alignItems: 'center', gap: 6, marginTop: 3 }}>
                <View
                  style={{ width: 7, height: 7, borderRadius: 4, backgroundColor: device.statusColor }}
                />
                <Text style={{ fontSize: 12, color: colors.textMuted, fontFamily: 'Nunito_600SemiBold' }}>
                  {device.statusLabel}
                </Text>
              </View>
            </View>
          </View>

          {/* Schutz-Verlauf (HalfDonut, wie Profile) */}
          <View
            style={{
              backgroundColor: colors.card,
              borderWidth: 1,
              borderColor: colors.border,
              borderRadius: 14,
              padding: 16,
            }}
          >
            <View style={{ flexDirection: 'row', alignItems: 'center', gap: 8, marginBottom: 10 }}>
              <Ionicons name="shield-checkmark-outline" size={14} color={colors.textMuted} />
              <Text
                style={{
                  fontSize: 11,
                  color: colors.textMuted,
                  fontFamily: 'Nunito_700Bold',
                  letterSpacing: 0.8,
                  textTransform: 'uppercase',
                }}
              >
                {t('devices.detail_coverage_label')}
              </Text>
            </View>

            <View style={{ flexDirection: 'row', alignItems: 'flex-end', gap: 16 }}>
              <HalfDonut
                segments={segments}
                centerValue={protectedDays}
                centerLabel={t('profile.coverage_center_label')}
                width={DONUT_WIDTH}
              />
              <View style={{ flex: 1, gap: 8, paddingBottom: 8 }}>
                <View style={{ flexDirection: 'row', alignItems: 'center', gap: 6 }}>
                  <View style={{ width: 8, height: 8, borderRadius: 4, backgroundColor: PROTECTED_COLOR }} />
                  <Text style={{ fontSize: 12, fontFamily: 'Nunito_600SemiBold', color: colors.text }}>
                    {protectedDays} {t('devices.detail_this_device_protected')}
                  </Text>
                </View>
                <View style={{ flexDirection: 'row', alignItems: 'center', gap: 6 }}>
                  <View
                    style={{
                      width: 8,
                      height: 8,
                      borderRadius: 4,
                      backgroundColor: UNPROTECTED_COLOR,
                      borderWidth: 1,
                      borderColor: colors.border,
                    }}
                  />
                  <Text style={{ fontSize: 12, fontFamily: 'Nunito_400Regular', color: colors.textMuted }}>
                    {unprotectedDays} {t('devices.detail_before_binding')}
                  </Text>
                </View>
              </View>
            </View>
          </View>

          {/* Meta-Infos */}
          <View
            style={{
              backgroundColor: colors.card,
              borderWidth: 1,
              borderColor: colors.border,
              borderRadius: 14,
              overflow: 'hidden',
            }}
          >
            <InfoRow
              label={t('devices.detail_connection')}
              value={device.statusLabel}
              valueColor={device.statusColor}
              colors={colors}
            />
            <InfoRow
              label={t('devices.detail_added')}
              value={fmtDate(device.createdAt)}
              colors={colors}
              divider
            />
            {device.lastSeenAt ? (
              <InfoRow
                label={t('devices.detail_last_seen')}
                value={fmtLastSeen(device.lastSeenAt, t)}
                colors={colors}
                divider
              />
            ) : null}
          </View>
        </View>
      )}
    </FormSheet>
  );
}

function InfoRow({
  label,
  value,
  valueColor,
  colors,
  divider,
}: {
  label: string;
  value: string;
  valueColor?: string;
  colors: ReturnType<typeof useColors>;
  divider?: boolean;
}) {
  return (
    <View
      style={{
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'space-between',
        paddingHorizontal: 14,
        paddingVertical: 13,
        borderTopWidth: divider ? 1 : 0,
        borderTopColor: colors.border,
      }}
    >
      <Text style={{ fontSize: 14, color: colors.textMuted, fontFamily: 'Nunito_400Regular' }}>
        {label}
      </Text>
      <Text
        style={{
          fontSize: 14,
          color: valueColor ?? colors.text,
          fontFamily: 'Nunito_600SemiBold',
        }}
      >
        {value}
      </Text>
    </View>
  );
}
