import { useEffect, useRef, useState } from "react";
import { ActivityIndicator, Text, TouchableOpacity, View } from "react-native";
import { TrueSheet, type SheetDetent } from "@lodev09/react-native-true-sheet";
import { Ionicons } from "@expo/vector-icons";
import { useTranslation } from "react-i18next";
import { useColors } from "../lib/theme";
import { useDeviceApprovalStore } from "../stores/deviceApproval";

/**
 * Sheet das auf dem NEUEN Gerät erscheint nachdem es Approval angefordert hat.
 *
 * Zeigt:
 *  - 6-stelligen Code (zum visuellen Vergleich mit dem anderen Gerät)
 *  - Status: "Warte auf Bestätigung..." / "Bestätigt ✓" / "Abgelehnt"
 *  - "Per E-Mail senden" Fallback-Button
 *
 * Pollt alle 2.5s den Status (Realtime ist nicht zuverlässig auf einem
 * Gerät das noch keinen registrierten Device-Slot hat).
 *
 * Caller (DeviceLimitReachedSheet) füllt store.outgoing → dieses Sheet öffnet.
 * Bei status="approved" → caller triggert register-Retry.
 */
export function DeviceApprovalPendingSheet(props: {
  /** Wird aufgerufen wenn Approval = approved. Caller soll dann register retryen. */
  onApproved?: () => void;
}) {
  const { t } = useTranslation();
  const colors = useColors();
  const sheetRef = useRef<TrueSheet>(null);
  const outgoing = useDeviceApprovalStore((s) => s.outgoing);
  const emailSent = useDeviceApprovalStore((s) => s.outgoingEmailSent);
  const error = useDeviceApprovalStore((s) => s.outgoingError);
  const pollOutgoing = useDeviceApprovalStore((s) => s.pollOutgoing);
  const sendEmailFallback = useDeviceApprovalStore((s) => s.sendEmailFallback);
  const clearOutgoing = useDeviceApprovalStore((s) => s.clearOutgoing);
  const [sendingEmail, setSendingEmail] = useState(false);

  // Sheet open/close based on store
  useEffect(() => {
    if (outgoing) sheetRef.current?.present();
    else sheetRef.current?.dismiss();
  }, [outgoing]);

  // Polling
  useEffect(() => {
    if (!outgoing || outgoing.status !== "pending") return;
    const interval = setInterval(() => pollOutgoing(), 2500);
    return () => clearInterval(interval);
  }, [outgoing, pollOutgoing]);

  // Trigger onApproved
  useEffect(() => {
    if (outgoing?.status === "approved") {
      props.onApproved?.();
    }
  }, [outgoing?.status, props]);

  if (!outgoing) return null;

  const isPending = outgoing.status === "pending";
  const isApproved = outgoing.status === "approved";
  const isRejected = outgoing.status === "rejected";
  const isExpired = outgoing.status === "expired";

  async function handleSendEmail() {
    setSendingEmail(true);
    try {
      await sendEmailFallback();
    } finally {
      setSendingEmail(false);
    }
  }

  return (
    <TrueSheet
      ref={sheetRef}
      detents={["auto", 1] satisfies SheetDetent[]}
      cornerRadius={20}
      grabber
      onDidDismiss={() => clearOutgoing()}
    >
      <View style={{ paddingHorizontal: 20, paddingTop: 8, paddingBottom: 32 }}>
        <View
          style={{
            width: 48,
            height: 48,
            borderRadius: 14,
            backgroundColor: isApproved
              ? "rgba(34,197,94,0.12)"
              : isRejected || isExpired
                ? "rgba(239,68,68,0.12)"
                : "rgba(0,122,255,0.12)",
            alignItems: "center",
            justifyContent: "center",
            marginBottom: 14,
          }}
        >
          <Ionicons
            name={
              isApproved
                ? "checkmark-circle"
                : isRejected || isExpired
                  ? "close-circle"
                  : "shield-checkmark-outline"
            }
            size={24}
            color={
              isApproved
                ? "#22c55e"
                : isRejected || isExpired
                  ? "#ef4444"
                  : "#007AFF"
            }
          />
        </View>

        <Text
          style={{
            fontSize: 22,
            color: colors.text,
            fontFamily: "Nunito_700Bold",
            marginBottom: 6,
          }}
        >
          {isApproved
            ? t("device_approval.pending_approved_title")
            : isRejected
              ? t("device_approval.pending_rejected_title")
              : isExpired
                ? t("device_approval.pending_expired_title")
                : t("device_approval.pending_title")}
        </Text>
        <Text
          style={{
            fontSize: 14,
            color: colors.textMuted,
            fontFamily: "Nunito_400Regular",
            marginBottom: 20,
            lineHeight: 20,
          }}
        >
          {isApproved
            ? t("device_approval.pending_approved_subtitle")
            : isRejected
              ? t("device_approval.pending_rejected_subtitle")
              : isExpired
                ? t("device_approval.pending_expired_subtitle")
                : t("device_approval.pending_subtitle")}
        </Text>

        {/* CODE BOX */}
        {isPending ? (
          <View
            style={{
              backgroundColor: colors.bg,
              borderRadius: 14,
              paddingVertical: 24,
              alignItems: "center",
              borderWidth: 1,
              borderColor: "rgba(0,0,0,0.06)",
              marginBottom: 16,
            }}
          >
            <Text
              style={{
                fontSize: 11,
                color: colors.textMuted,
                fontFamily: "Nunito_600SemiBold",
                letterSpacing: 1,
                textTransform: "uppercase",
                marginBottom: 8,
              }}
            >
              {t("device_approval.code_label")}
            </Text>
            <Text
              style={{
                fontSize: 36,
                fontFamily: "Nunito_700Bold",
                letterSpacing: 8,
                color: colors.text,
              }}
            >
              {outgoing.code}
            </Text>
            <View
              style={{
                flexDirection: "row",
                alignItems: "center",
                gap: 6,
                marginTop: 12,
              }}
            >
              <ActivityIndicator size="small" color={colors.textMuted} />
              <Text
                style={{
                  fontSize: 12,
                  color: colors.textMuted,
                  fontFamily: "Nunito_400Regular",
                }}
              >
                {t("device_approval.waiting")}
              </Text>
            </View>
          </View>
        ) : null}

        {error ? (
          <Text
            style={{
              fontSize: 12,
              color: colors.error,
              fontFamily: "Nunito_600SemiBold",
              marginBottom: 12,
              textAlign: "center",
            }}
          >
            {error}
          </Text>
        ) : null}

        {/* Email-Fallback */}
        {isPending ? (
          <TouchableOpacity
            onPress={handleSendEmail}
            disabled={sendingEmail || emailSent}
            activeOpacity={0.7}
            style={{
              paddingVertical: 12,
              borderRadius: 12,
              borderWidth: 1,
              borderColor: "rgba(0,0,0,0.1)",
              alignItems: "center",
              marginBottom: 10,
              opacity: emailSent ? 0.5 : 1,
            }}
          >
            {sendingEmail ? (
              <ActivityIndicator size="small" color={colors.text} />
            ) : (
              <Text
                style={{
                  fontSize: 14,
                  color: colors.text,
                  fontFamily: "Nunito_600SemiBold",
                }}
              >
                {emailSent
                  ? t("device_approval.email_already_sent")
                  : t("device_approval.send_email")}
              </Text>
            )}
          </TouchableOpacity>
        ) : null}

        {/* Close button (only if not pending) */}
        {!isPending ? (
          <TouchableOpacity
            onPress={() => {
              sheetRef.current?.dismiss();
              clearOutgoing();
            }}
            activeOpacity={0.7}
            style={{
              paddingVertical: 14,
              borderRadius: 12,
              backgroundColor: isApproved ? "#22c55e" : "rgba(0,0,0,0.06)",
              alignItems: "center",
            }}
          >
            <Text
              style={{
                fontSize: 15,
                color: isApproved ? "#fff" : colors.text,
                fontFamily: "Nunito_700Bold",
              }}
            >
              {isApproved
                ? t("device_approval.continue")
                : t("device_approval.close")}
            </Text>
          </TouchableOpacity>
        ) : (
          <TouchableOpacity
            onPress={() => {
              sheetRef.current?.dismiss();
              clearOutgoing();
            }}
            activeOpacity={0.7}
            style={{
              paddingVertical: 10,
              alignItems: "center",
            }}
          >
            <Text
              style={{
                fontSize: 13,
                color: colors.textMuted,
                fontFamily: "Nunito_400Regular",
              }}
            >
              {t("device_approval.cancel")}
            </Text>
          </TouchableOpacity>
        )}
      </View>
    </TrueSheet>
  );
}