import AuthHeader from '@/components/ui/AuthHeader';
import { auth_api } from '@/screens/auth/login/lib/api';
import { products_api } from '@/screens/home/lib/api';
import AsyncStorage from '@react-native-async-storage/async-storage';
import { useMutation, useQuery } from '@tanstack/react-query';
import { AxiosError } from 'axios';
import { LinearGradient } from 'expo-linear-gradient';
import { Stack, useLocalSearchParams, useRouter } from 'expo-router';
import { ChevronLeft } from 'lucide-react-native';
import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import {
  ActivityIndicator,
  Alert,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';

interface Category {
  id: number;
  name: string;
  is_leaf: boolean;
}

export default function CategorySelectScreen() {
  const router = useRouter();
  const { t } = useTranslation();
  const { phone, stir, person_type, director_full_name, referal, first_name, last_name, middle_name } = useLocalSearchParams<{
    phone: string;
    stir: string;
    person_type: 'band' | 'ytt';
    referal: string;
    director_full_name: string;
    first_name: string;
    last_name: string;
    middle_name: string;
  }>();

  const [selected, setSelected] = useState<number | null>(null);
  const [categories, setCategories] = useState<Category[]>([]);
  const [history, setHistory] = useState<Category[][]>([]);

  /** ROOT categories */
  const { isLoading } = useQuery({
    queryKey: ['categories-root'],
    queryFn: () => products_api.getCategorys(),
    select: (res) => {
      setCategories(res.data.data);
    },
  });

  /** CHILD categories */
  const childMutation = useMutation({
    mutationFn: (id: number) => products_api.getCategorys({ parent: id }),
    onSuccess: (res) => {
      setHistory((prev) => [...prev, categories]);
      setCategories(res.data.data);
    },
  });

  /** REGISTER */
  const registerMutation = useMutation({
    mutationFn: (body: {
      phone: string;
      stir: string;
      person_type: string;
      activate_types: number[];
      director_full_name: string;
      referal: string;
      first_name: string;
      last_name: string;
    }) => auth_api.register(body),
    onSuccess: async () => {
      router.replace('/(auth)/register-confirm');
      await AsyncStorage.setItem('phone', phone);
    },
    onError: (err: AxiosError) => {
      const errMessage = (err.response?.data as { data: { stir: string[] } }).data.stir[0];
      const errMessageDetail = (err.response?.data as { data: { detail: string } }).data.detail;

      const errrAlert = errMessage ? errMessage : errMessageDetail;

      Alert.alert(t('Xatolik yuz berdi'), errMessage || errrAlert || t('erroXatolik yuz berdi'));
    },
  });

  const onCategoryPress = (cat: Category) => {
    if (cat.is_leaf) {
      setSelected(cat.id);
    } else {
      childMutation.mutate(cat.id);
    }
  };

  const goBack = () => {
    if (history.length === 0) return;
    const prev = history[history.length - 1];
    setCategories(prev);
    setHistory((h) => h.slice(0, -1));
    setSelected(null);
  };

  const full_name = first_name.length > 0 ? first_name + ' ' + last_name + ' ' + middle_name : director_full_name;

  return (
    <View style={styles.safeArea}>
      <AuthHeader />
      <Stack.Screen options={{ title: t('Yo‘nalishni tanlang') }} />

      <LinearGradient colors={['#0f172a', '#1e293b']} style={StyleSheet.absoluteFill} />

      <ScrollView contentContainerStyle={styles.container}>
        {history.length > 0 && (
          <TouchableOpacity onPress={goBack} style={styles.backBtn}>
            <ChevronLeft size={20} color="#3b82f6" />
            <Text style={styles.backText}>{t('Orqaga')}</Text>
          </TouchableOpacity>
        )}
        <Text style={styles.title}>{t("Yo'nalishni tanlang")}</Text>

        {isLoading || childMutation.isPending ? (
          <ActivityIndicator color="#3b82f6" />
        ) : (
          categories.map((c) => {
            const active = selected === c.id;
            return (
              <TouchableOpacity
                key={c.id}
                style={[styles.item, active && styles.itemActive]}
                onPress={() => onCategoryPress(c)}
              >
                <Text style={[styles.text, active && styles.textActive]}>{c.name}</Text>
              </TouchableOpacity>
            );
          })
        )}
      </ScrollView>

      <TouchableOpacity
        disabled={!selected || registerMutation.isPending}
        style={[styles.bottom, (!selected || registerMutation.isPending) && styles.bottomDisabled]}
        onPress={() => {
          if (!selected) return;
          registerMutation.mutate({
            activate_types: [selected],
            person_type,
            phone: `998${phone}`,
            stir,
            referal: referal,
            director_full_name: director_full_name,
            first_name: full_name,
            last_name: last_name,
          });
        }}
      >
        <Text style={styles.bottomText} disabled={registerMutation.isPending}>
          {t('Tadiqlash')}
        </Text>
      </TouchableOpacity>
    </View>
  );
}

const styles = StyleSheet.create({
  title: {
    fontSize: 18,
    fontWeight: '700',
    color: '#ffffff',
    marginBottom: 12,
  },
  safeArea: {
    flex: 1,
    backgroundColor: '#0f172a',
  },

  container: {
    paddingHorizontal: 20,
    paddingTop: 16,
    paddingBottom: 70,
    gap: 12,
  },

  backBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
    marginBottom: 12,
  },

  backText: {
    fontSize: 14,
    color: '#3b82f6',
    fontWeight: '600',
  },

  item: {
    paddingVertical: 18,
    paddingHorizontal: 18,
    borderRadius: 16,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    backgroundColor: 'rgba(255,255,255,0.06)',
    borderWidth: 1,
    borderColor: 'rgba(255,255,255,0.12)',
  },

  itemActive: {
    backgroundColor: 'rgba(59,130,246,0.15)',
    borderColor: 'rgba(59,130,246,0.6)',
  },

  text: {
    fontSize: 15,
    fontWeight: '600',
    color: '#cbd5f5',
  },

  textActive: {
    color: '#ffffff',
    fontWeight: '800',
  },

  arrow: {
    fontSize: 18,
    color: '#94a3b8',
  },

  bottom: {
    position: 'absolute',
    bottom: 20,
    left: 16,
    right: 16,
    height: 54,
    borderRadius: 16,
    backgroundColor: '#3b82f6',
    alignItems: 'center',
    justifyContent: 'center',
    shadowColor: '#3b82f6',
    shadowOffset: { width: 0, height: 8 },
    shadowOpacity: 0.35,
    shadowRadius: 12,
    elevation: 10,
  },

  bottomDisabled: {
    backgroundColor: '#64748b',
  },

  bottomText: {
    color: '#ffffff',
    fontWeight: '800',
    fontSize: 16,
  },

  decorCircle1: {
    position: 'absolute',
    top: -120,
    right: -80,
    width: 300,
    height: 300,
    borderRadius: 150,
    backgroundColor: 'rgba(59,130,246,0.12)',
  },

  decorCircle2: {
    position: 'absolute',
    bottom: -120,
    left: -100,
    width: 280,
    height: 280,
    borderRadius: 140,
    backgroundColor: 'rgba(16,185,129,0.1)',
  },
});