import { useAlert } from '@/components/AlertComponent';
import LoadingScreen from '@/components/LoadingScreen';
import api from '@/utils/api';
import { ImageIcon, Plus, Filter, Newspaper } from 'lucide-react-native';
import React, { useEffect, useState } from 'react';
import { RefreshControl, ScrollView, Text, TouchableOpacity, View } from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import FilterModal from '@/components/FilterModal';
import { Place } from '@/types/types';
import { useRouter, useFocusEffect } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import { useCallback } from 'react';

export default function JournalScreen() {
    const router = useRouter();
    const alert = useAlert();
    const [updates, setUpdates] = useState<any[]>([]);
    const [isLoading, setIsLoading] = useState(true);
    const [refreshing, setRefreshing] = useState(false);

    // Filters state
    const [showFilterModal, setShowFilterModal] = useState(false);
    const [places, setPlaces] = useState<Place[]>([]);
    const [filterRange, setFilterRange] = useState<{ startDate: string | null; endDate: string | null }>({ startDate: null, endDate: null });
    const [filterPlace, setFilterPlace] = useState<any>(null);

    const activeFiltersCount = (filterRange.startDate ? 1 : 0) + (filterPlace ? 1 : 0);

    const fetchPlaces = async () => {
        try {
            const response = await api.get('/place/get-places');
            if (response.data?.success) {
                setPlaces(response.data.places || []);
            }
        } catch (error) {
            console.error('Errore nel recupero dei cantieri:', error);
        }
    };

    const fetchUpdates = async (currentRange = filterRange, currentPlace = filterPlace) => {
        try {
            if (!refreshing) setIsLoading(true);

            const rangeParam = currentRange.startDate ? currentRange : null;
            const params = { range: rangeParam, place: currentPlace };
            const response = await api.post('/journal/list', { params });

            if (response.data?.success) {
                setUpdates(response.data.result || []);
            }
        } catch (error) {
            console.error('Errore nel recupero del giornale:', error);
            alert.showAlert('error', 'Errore', 'Impossibile recuperare il giornale di cantiere.');
        } finally {
            setIsLoading(false);
            setRefreshing(false);
        }
    };

    useEffect(() => {
        fetchPlaces();
    }, []);

    useFocusEffect(
        useCallback(() => {
            fetchUpdates();
        }, [filterRange, filterPlace])
    );

    const onRefresh = () => {
        setRefreshing(true);
        fetchUpdates();
    };

    // The fetch is triggered by useFocusEffect, which reacts to filter changes:
    // calling fetchUpdates here too would fire a second, identical request.
    const handleApplyFilters = (range: any, place: any) => {
        setFilterRange(range);
        setFilterPlace(place);
        setShowFilterModal(false);
    };

    const handleResetFilters = () => {
        setFilterRange({ startDate: null, endDate: null });
        setFilterPlace(null);
        setShowFilterModal(false);
    };

    if (isLoading && !refreshing) {
        return <LoadingScreen />;
    }

    return (
        <View className="flex-1 bg-primary-dark">
            <StatusBar style="light" />
            {/* Header */}
            <SafeAreaView edges={['top']} className='pt-5'>
                <View className="pb-6 px-6 z-10 flex-row justify-between items-center">
                    <View>
                        <Text className="text-white text-md font-semibold uppercase tracking-wider mb-1">Elenco invii al giornale</Text>
                        <Text className="text-yellow-400 text-3xl font-bold leading-tight">Giornale di Cantiere</Text>
                    </View>
                    <View className="bg-white/10 p-4 rounded-full">
                        <Newspaper size={32} color="white" pointerEvents="none" />
                    </View>
                </View>
            </SafeAreaView>

            <View className="flex-1 bg-gray-50 rounded-t-[2.5rem] overflow-hidden">
            {/* List */}
            <ScrollView
                contentContainerStyle={{ padding: 20, paddingBottom: 180 }}
                showsVerticalScrollIndicator={false}
                refreshControl={<RefreshControl refreshing={refreshing} onRefresh={onRefresh} colors={['#1071C2']} />}
            >
                {updates.length === 0 ? (
                    <View className="bg-white p-8 rounded-3xl border border-gray-100 items-center justify-center border-dashed mt-4">
                        <Text className="text-gray-400 font-medium text-center">Nessun invio registrato al giornale di cantiere</Text>
                    </View>
                ) : (
                    <View className="gap-4">
                        {updates.map((item, index) => (
                            <View key={index} className="bg-white p-5 rounded-3xl shadow-sm border border-gray-100">
                                <View className="mb-3">
                                    <Text className="font-bold text-[#082963] text-lg uppercase tracking-wide leading-tight">
                                        {item.place_name}
                                    </Text>
                                    <Text className="text-gray-500 text-sm font-medium mt-1">
                                        {item.place_address}
                                    </Text>
                                    <Text className="text-gray-400 text-base leading-relaxed mt-1">
                                        {item.description}
                                    </Text>
                                </View>

                                <View className="flex-row items-center justify-between border-t border-gray-50 pt-4">
                                    <View className="flex-row items-center gap-4">
                                        <View className="bg-blue-50 p-3 rounded-2xl">
                                            <ImageIcon size={24} color="#082963" />
                                        </View>
                                        <View>
                                            <Text className="font-bold text-primary text-lg">
                                                {item.n_files} File Inviati
                                            </Text>
                                            <Text className="text-gray-400 font-bold text-sm mt-0.5">{item.date}</Text>
                                        </View>
                                    </View>
                                    {item.n_files > 0 && (
                                        <TouchableOpacity
                                            className="bg-gray-100 px-4 py-2 rounded-xl active:bg-gray-200"
                                            onPress={() => router.push(`/journal/${item.id}`)}
                                        >
                                            <Text className="text-gray-600 font-bold text-sm">Vedi</Text>
                                        </TouchableOpacity>
                                    )}
                                </View>
                            </View>
                        ))}
                    </View>
                )}
            </ScrollView>

            {/* FAB Add Journal */}
            <TouchableOpacity
                onPress={() => router.push('/journal/add')}
                className="absolute bottom-[6.5rem] right-6 w-16 h-16 bg-white border border-[#1071C2] rounded-full shadow-lg items-center justify-center active:scale-90"
            >
                <Plus size={32} color="#1071C2" pointerEvents="none" />
            </TouchableOpacity>

            {/* FAB Filter */}
            <TouchableOpacity
                onPress={() => setShowFilterModal(true)}
                className="absolute bottom-8 right-6 w-16 h-16 bg-[#1071C2] rounded-full shadow-lg items-center justify-center active:scale-90"
            >
                <Filter size={28} color="white" pointerEvents="none" />
                {activeFiltersCount > 0 && (
                    <View className="absolute top-0 right-0 bg-red-500 w-6 h-6 rounded-full items-center justify-center border-2 border-white">
                        <Text className="text-white text-xs font-bold">{activeFiltersCount}</Text>
                    </View>
                )}
            </TouchableOpacity>

            <FilterModal
                visible={showFilterModal}
                places={places}
                currentRange={filterRange}
                currentPlace={filterPlace}
                onClose={() => setShowFilterModal(false)}
                onApply={handleApplyFilters}
                onReset={handleResetFilters}
            />
            </View>
        </View>
    );
}