import { Feather } from "@expo/vector-icons";
import { useQuery } from "@tanstack/react-query";
import { useRouter } from "expo-router";
import React, { useMemo, useState } from "react";
import { Pressable, ScrollView, StyleSheet, Text, View } from "react-native";
import { useApp } from "../../src/app-context";
import { GuestAuthGate } from "../../src/components/GuestAuthGate";
import { NotificationCard } from "../../src/components/NotificationCard";
import { ScreenShell } from "../../src/components/ScreenShell";
import { useNotificationAction } from "../../src/notification-actions";
import { notificationApi, notificationKeys } from "../../src/notification-api";
import { typeMap } from "../../src/notification-presenter";
import { colors, radii, spacing } from "../../src/theme";
import { ErrorNotice, Loading, styles } from "../../src/ui";

export default function NotificationCenterScreen() {
  const { authStatus } = useApp();
  const authenticated = authStatus === "authenticated";
  const router = useRouter();
  const [actionError, setActionError] = useState<unknown>();
  const catalog = useQuery({
    queryKey: notificationKeys.catalog,
    queryFn: notificationApi.catalog,
    staleTime: Infinity,
  });
  const notifications = useQuery({
    queryKey: notificationKeys.center,
    queryFn: () => notificationApi.list("center"),
    enabled: authenticated,
  });
  const byCode = useMemo(() => typeMap(catalog.data ?? []), [catalog.data]);
  const action = useNotificationAction({
    authenticated,
    onError: setActionError,
    requireAuth: () => router.replace({ pathname: "/", params: { authorize: "1" } }),
  });

  return (
    <ScreenShell>
      <View style={local.header}>
        <Pressable accessibilityLabel="Назад" accessibilityRole="button" onPress={() => router.back()} style={local.back}>
          <Feather name="arrow-left" size={20} color={colors.foreground} />
        </Pressable>
        <Text accessibilityRole="header" style={styles.title}>Центр уведомлений</Text>
      </View>

      {!authenticated ? (
        <GuestAuthGate
          icon="bell"
          title="Уведомления доступны после входа"
          description="Авторизуйтесь, чтобы видеть важные напоминания, документы и статусы услуг."
        />
      ) : (
        <ScrollView contentContainerStyle={local.content}>
          {(notifications.isLoading || catalog.isLoading) && <Loading />}
          {(notifications.error || catalog.error) && (
            <ErrorNotice
              error={notifications.error ?? catalog.error}
              retry={() => { void notifications.refetch(); void catalog.refetch(); }}
            />
          )}
          {!notifications.isLoading && !notifications.error && notifications.data?.length === 0 && (
            <View style={local.empty}>
              <Feather name="check-circle" size={32} color={colors.success} />
              <Text style={styles.heading}>Новых уведомлений нет</Text>
              <Text style={styles.muted}>Здесь появятся важные сообщения и задачи.</Text>
            </View>
          )}
          {notifications.data?.map((item) => (
            <NotificationCard
              key={item.id}
              compact
              item={item}
              type={byCode.get(item.notification_type)}
              onCta={() => void action(item, byCode.get(item.notification_type))}
            />
          ))}
          {Boolean(actionError) && <ErrorNotice error={actionError} />}
        </ScrollView>
      )}
    </ScreenShell>
  );
}

const local = StyleSheet.create({
  header: {
    flexDirection: "row",
    alignItems: "center",
    gap: spacing.md,
    padding: spacing.lg,
    borderBottomWidth: 1,
    borderBottomColor: colors.border,
  },
  back: { width: 36, height: 36, borderRadius: radii.full, alignItems: "center", justifyContent: "center" },
  content: { padding: spacing.lg, gap: spacing.md, paddingBottom: 40 },
  empty: { alignItems: "center", gap: spacing.sm, paddingVertical: 48 },
});