import { Ionicons, MaterialCommunityIcons, MaterialIcons } from '@expo/vector-icons';
import axios from 'axios';
import { addDays, addMonths, endOfMonth, endOfWeek, format, getMonth, getYear, isSameDay, startOfMonth, startOfWeek, subMonths } from 'date-fns';
import { useRouter } from 'expo-router';
import * as SecureStore from 'expo-secure-store';
import React, { useEffect, useState } from "react";
import { ScrollView, StyleSheet, Text, TouchableOpacity, View } from "react-native";

const PRIMARY = '#A24BFA';
const BG = '#0c0a0a';
const NAV_ITEMS = [
  { key: 'profile', label: 'Profilom', icon: (color: string) => <MaterialIcons name="person" size={28} color={color} /> },
  { key: 'schedule', label: 'Beosztás', icon: (color: string) => <MaterialCommunityIcons name="calendar-month" size={28} color={color} /> },
  { key: 'requests', label: 'Kérelmek', icon: (color: string) => <Ionicons name="mail" size={28} color={color} /> },
];

export default function Profile() {
  const [fullName, setFullName] = useState('');
  const [email, setEmail] = useState('');
  const [userId, setUserId] = useState('');
  const [activeTab, setActiveTab] = useState('profile');
  const [currentMonth, setCurrentMonth] = useState(new Date());
  const [workdays, setWorkdays] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const router = useRouter();

  useEffect(() => {
    (async () => {
      const name = await SecureStore.getItemAsync('fullName');
      const mail = await SecureStore.getItemAsync('email');
      const uid = await SecureStore.getItemAsync('userId');
      setFullName(name || '');
      setEmail(mail || '');
      setUserId(uid || '');
    })();
  }, []);

  useEffect(() => {
    if (activeTab === 'schedule') {
      fetchWorkdays();
    }
    // eslint-disable-next-line
  }, [currentMonth, activeTab]);

  async function fetchWorkdays() {
    setLoading(true);
    try {
      const userCookie = await SecureStore.getItemAsync('cookie');
      const year = getYear(currentMonth);
      const month = getMonth(currentMonth) + 1;
      const response = await axios.post(
        'https://mymenu.mcdonalds.hu/api/UserDataApi/GetWorkDayMonthList',
        { Data: { Year: year, Month: month } },
        {
          headers: {
            'Content-Type': 'application/json',
            'cookie': userCookie,
            'origin': 'https://mymenu.mcdonalds.hu',
          },
        }
      );
      setWorkdays(response.data.data.Data || []);
    } catch (e) {
      setWorkdays([]);
    } finally {
      setLoading(false);
    }
  }

  async function handleLogout() {
    await SecureStore.deleteItemAsync('cookie');
    await SecureStore.deleteItemAsync('userId');
    await SecureStore.deleteItemAsync('email');
    await SecureStore.deleteItemAsync('password');
    await SecureStore.deleteItemAsync('fullName');
    router.replace('/');
  }

  function renderCalendar() {
    const monthStart = startOfMonth(currentMonth);
    const monthEnd = endOfMonth(monthStart);
    const startDate = startOfWeek(monthStart, { weekStartsOn: 1 });
    const endDate = endOfWeek(monthEnd, { weekStartsOn: 1 });
    const today = new Date();
    const rows = [];
    let days = [];
    let day = startDate;
    let formattedDate = '';
    while (day <= endDate) {
      for (let i = 0; i < 7; i++) {
        formattedDate = format(day, 'yyyy-MM-dd');
        const wd = workdays.find(w => w.WorkDay?.slice(0, 10) === formattedDate);
        let bg = 'rgba(24,20,28,0.7)';
        let color = '#fff';
        let borderWidth = 0;
        if (isSameDay(day, today)) {
          borderWidth = 2;
          color = PRIMARY;
        }
        if (wd) {
          bg = wd.color || 'deepskyblue';
          color = '#222';
        }
        days.push(
          <View key={day.toString()} style={{ flex: 1, aspectRatio: 1, margin: 2 }}>
            <View style={{
              backgroundColor: bg,
              borderRadius: 8,
              borderWidth,
              borderColor: PRIMARY,
              justifyContent: 'center',
              alignItems: 'center',
              flex: 1,
            }}>
              <Text style={{ color, fontWeight: isSameDay(day, today) ? 'bold' : 'normal' }}>{format(day, 'd')}</Text>
              {wd && <Text style={{ color, fontSize: 10 }}>{wd.text}</Text>}
            </View>
          </View>
        );
        day = addDays(day, 1);
      }
      rows.push(<View key={day.toString()} style={{ flexDirection: 'row' }}>{days}</View>);
      days = [];
    }
    return (
      <View>
        <View style={{ flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', marginBottom: 12 }}>
          <TouchableOpacity onPress={() => setCurrentMonth(subMonths(currentMonth, 1))}><Ionicons name="chevron-back" size={28} color="#fff" /></TouchableOpacity>
          <Text style={{ color: '#fff', fontSize: 18, fontWeight: 'bold' }}>{format(currentMonth, 'yyyy. MMMM')}</Text>
          <TouchableOpacity onPress={() => setCurrentMonth(addMonths(currentMonth, 1))}><Ionicons name="chevron-forward" size={28} color="#fff" /></TouchableOpacity>
        </View>
        <View style={{ flexDirection: 'row', marginBottom: 4 }}>
          {["H", "K", "Sz", "Cs", "P", "Szo", "V"].map(d => (
            <Text key={d} style={{ flex: 1, color: '#bdbdbd', textAlign: 'center', fontWeight: 'bold' }}>{d}</Text>
          ))}
        </View>
        {loading ? (
          <Text style={{ color: '#fff', textAlign: 'center', marginTop: 24 }}>Betöltés…</Text>
        ) : (
          <View>{rows}</View>
        )}
      </View>
    );
  }

  function renderContent() {
    if (activeTab === 'profile') {
      return (
        <View style={styles.card}>
          <Text style={styles.label}>Név:</Text>
          <Text style={styles.value}>{fullName}</Text>
          <Text style={styles.label}>Email:</Text>
          <Text style={styles.value}>{email}</Text>
          <Text style={styles.label}>UserID:</Text>
          <Text style={styles.value}>{userId}</Text>
          <TouchableOpacity style={styles.logoutButton} onPress={handleLogout}>
            <Text style={styles.logoutText}>Kijelentkezés</Text>
          </TouchableOpacity>
        </View>
      );
    } else if (activeTab === 'schedule') {
      return (
        <ScrollView style={{ width: '100%' }} contentContainerStyle={{ alignItems: 'center' }}>
          <View style={styles.card}>
            <Text style={styles.label}>Beosztás naptár</Text>
            {renderCalendar()}
          </View>
        </ScrollView>
      );
    } else if (activeTab === 'requests') {
      return (
        <View style={styles.card}>
          <Text style={styles.value}>Kérelmek funkció hamarosan…</Text>
        </View>
      );
    }
  }

  return (
    <View style={styles.container}>
      <Text style={styles.title}>Profil</Text>
      {renderContent()}
      <View style={styles.navBar}>
        {NAV_ITEMS.map(item => (
          <TouchableOpacity
            key={item.key}
            style={styles.navItem}
            onPress={() => setActiveTab(item.key)}
          >
            {item.icon(activeTab === item.key ? PRIMARY : '#bdbdbd')}
            <Text style={[styles.navLabel, { color: activeTab === item.key ? PRIMARY : '#bdbdbd' }]}>{item.label}</Text>
          </TouchableOpacity>
        ))}
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: BG,
    justifyContent: 'center',
    alignItems: 'center',
    paddingBottom: 64,
  },
  title: {
    color: '#fff',
    fontWeight: 'bold',
    fontSize: 28,
    textAlign: 'center',
    marginBottom: 24,
    marginTop: 32,
  },
  card: {
    backgroundColor: 'rgba(24, 20, 28, 0.95)',
    borderRadius: 24,
    padding: 32,
    width: '90%',
    maxWidth: 400,
    shadowColor: '#000',
    shadowOpacity: 0.3,
    shadowRadius: 24,
    shadowOffset: { width: 0, height: 8 },
    elevation: 8,
    marginBottom: 32,
  },
  label: {
    color: '#bdbdbd',
    fontSize: 16,
    marginTop: 12,
    fontWeight: 'bold',
  },
  value: {
    color: PRIMARY,
    fontSize: 18,
    marginBottom: 8,
  },
  navBar: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    alignItems: 'center',
    backgroundColor: 'rgba(24, 20, 28, 0.98)',
    borderTopWidth: 1,
    borderTopColor: '#222',
    position: 'absolute',
    bottom: 0,
    left: 0,
    right: 0,
    height: 64,
    paddingHorizontal: 16,
  },
  navItem: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  navLabel: {
    fontSize: 13,
    marginTop: 2,
    fontWeight: 'bold',
  },
  logoutButton: {
    backgroundColor: PRIMARY,
    borderRadius: 12,
    paddingVertical: 16,
    alignItems: 'center',
    marginTop: 32,
    shadowColor: PRIMARY,
    shadowOpacity: 0.3,
    shadowRadius: 8,
    shadowOffset: { width: 0, height: 2 },
    elevation: 2,
  },
  logoutText: {
    color: '#fff',
    fontWeight: 'bold',
    fontSize: 18,
    letterSpacing: 1,
  },
});