'use client';

import { useEffect, useState } from 'react';
import { useRouter, useSearchParams } from 'next/navigation';
import { createClient } from '@/lib/supabase/client';
import BottleGrid from "@/components/BottleGrid";
import AuthForm from "@/components/AuthForm";
import OfflineIndicator from "@/components/OfflineIndicator";
import { useI18n } from "@/i18n/I18nContext";
import { useAuth } from "@/context/AuthContext";
import { useSession } from "@/context/SessionContext";
import TastingHub from "@/components/TastingHub";
import { Sparkles, Loader2, Search, SlidersHorizontal } from "lucide-react";
import { BottomNavigation } from '@/components/BottomNavigation';
import ScanAndTasteFlow from '@/components/ScanAndTasteFlow';
import UserStatusBadge from '@/components/UserStatusBadge';
import { getActiveSplits } from '@/services/split-actions';
import SplitCard from '@/components/SplitCard';
import HeroBanner from '@/components/HeroBanner';
import QuickActionsGrid from '@/components/QuickActionsGrid';
import { checkIsAdmin } from '@/services/track-api-usage';

export default function Home() {
    const supabase = createClient();
    const router = useRouter();
    const searchParams = useSearchParams();
    const [bottles, setBottles] = useState<any[]>([]);
    const { user, isLoading: isAuthLoading } = useAuth();
    const [isInternalLoading, setIsInternalLoading] = useState(false);
    const [fetchError, setFetchError] = useState<string | null>(null);
    const { t } = useI18n();
    const { activeSession } = useSession();
    const [isFlowOpen, setIsFlowOpen] = useState(false);
    const [isTastingHubOpen, setIsTastingHubOpen] = useState(false);
    const [capturedFile, setCapturedFile] = useState<File | null>(null);
    const [hasMounted, setHasMounted] = useState(false);
    const [publicSplits, setPublicSplits] = useState<any[]>([]);
    const [searchQuery, setSearchQuery] = useState('');

    useEffect(() => {
        setHasMounted(true);
    }, []);

    const handleImageSelected = (file: File) => {
        setCapturedFile(file);
        setIsFlowOpen(true);
    };

    useEffect(() => {
        if (!isAuthLoading && user) {
            fetchCollection();
        } else if (!isAuthLoading && !user) {
            setBottles([]);
        }
    }, [user, isAuthLoading]);

    useEffect(() => {
        getActiveSplits().then(res => {
            if (res.success && res.splits) {
                setPublicSplits(res.splits);
            }
        });

        const handleCollectionUpdated = () => {
            console.log('[Home] Collection update event received, refreshing...');
            fetchCollection();
        };
        window.addEventListener('collection-updated', handleCollectionUpdated);

        return () => {
            window.removeEventListener('collection-updated', handleCollectionUpdated);
        };
    }, []);

    const fetchCollection = async () => {
        setIsInternalLoading(true);
        try {
            const { data, error } = await supabase
                .from('bottles')
                .select(`
                    *,
                    tastings (
                        created_at,
                        rating
                    )
                `)
                .order('created_at', { ascending: false });

            if (error) throw error;

            console.log(`Fetched ${data?.length || 0} bottles from Supabase`);

            const processedBottles = (data || []).map(bottle => {
                const lastTasted = bottle.tastings && bottle.tastings.length > 0
                    ? bottle.tastings.reduce((latest: string, current: any) =>
                        new Date(current.created_at) > new Date(latest) ? current.created_at : latest,
                        bottle.tastings[0].created_at
                    )
                    : null;

                return { ...bottle, last_tasted: lastTasted };
            });

            setBottles(processedBottles);
        } catch (err: any) {
            console.warn('[Home] Fetch collection error:', err?.message);
            const isNetworkError = !navigator.onLine ||
                err?.name === 'TypeError' ||
                err?.message?.includes('Failed to fetch');

            if (!isNetworkError) {
                setFetchError(err?.message || 'Unknown error');
            }
        } finally {
            setIsInternalLoading(false);
        }
    };

    const handleLogout = async () => {
        await supabase.auth.signOut();
    };

    // Filter bottles by search query
    const filteredBottles = bottles.filter(bottle => {
        if (!searchQuery.trim()) return true;
        const query = searchQuery.toLowerCase();
        return (
            bottle.name?.toLowerCase().includes(query) ||
            bottle.distillery?.toLowerCase().includes(query) ||
            bottle.category?.toLowerCase().includes(query)
        );
    });

    if (!hasMounted) {
        return (
            <main className="flex min-h-screen flex-col items-center justify-center bg-zinc-950">
                <Loader2 className="animate-spin text-orange-600" size={40} />
            </main>
        );
    }

    // Guest / Login View
    if (!user) {
        return (
            <main className="flex min-h-screen flex-col items-center justify-center p-6 bg-zinc-950">
                <div className="mb-12 text-center animate-in fade-in zoom-in duration-1000">
                    <h1 className="text-6xl font-bold text-zinc-50 tracking-tighter mb-4">
                        DRAM<span className="text-orange-600">LOG</span>
                    </h1>
                    <p className="text-zinc-500 max-w-sm mx-auto font-bold tracking-wide">
                        {t('home.tagline')}
                    </p>
                </div>
                <AuthForm />

                {publicSplits.length > 0 && (
                    <div className="mt-16 w-full max-w-lg space-y-6 animate-in fade-in slide-in-from-bottom-4 duration-1000 delay-300">
                        <div className="flex flex-col items-center gap-2">
                            <h2 className="text-[10px] font-black uppercase tracking-[0.4em] text-orange-600/60">
                                {t('splits.publicExplore')}
                            </h2>
                            <div className="h-px w-8 bg-orange-600/20" />
                        </div>
                        <div className="space-y-4">
                            {publicSplits.map((split) => (
                                <SplitCard
                                    key={split.id}
                                    split={split}
                                    onSelect={() => router.push(`/splits/${split.slug}`)}
                                />
                            ))}
                        </div>
                    </div>
                )}
            </main>
        );
    }

    const isLoading = isAuthLoading || isInternalLoading;

    // Authenticated Home View - New Layout
    return (
        <div className="flex flex-col min-h-screen bg-(--background) relative">
            {/* Scrollable Content Area */}
            <div className="flex-1 overflow-y-auto pb-24">
                {/* 1. Header */}
                <header className="px-4 pt-4 pb-2">
                    <div className="flex items-center justify-between gap-2">
                        <div className="flex flex-col shrink-0">
                            <h1 className="text-2xl font-bold text-zinc-50 tracking-tighter">
                                DRAM<span className="text-orange-600">LOG</span>
                            </h1>
                            {activeSession && (
                                <div className="flex items-center gap-2 mt-0.5 animate-in fade-in slide-in-from-left-2 duration-700">
                                    <div className="relative flex h-2 w-2">
                                        <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-orange-600 opacity-75"></span>
                                        <span className="relative inline-flex rounded-full h-2 w-2 bg-orange-600"></span>
                                    </div>
                                    <span className="text-[9px] font-bold uppercase tracking-widest text-orange-600 flex items-center gap-1">
                                        <Sparkles size={10} className="animate-pulse" />
                                        <span className="hidden sm:inline">Live:</span> {activeSession.name}
                                    </span>
                                </div>
                            )}
                        </div>
                        <div className="flex items-center gap-2">
                            <UserStatusBadge />
                            <OfflineIndicator />
                            <button
                                onClick={handleLogout}
                                className="text-[9px] font-bold uppercase tracking-widest text-zinc-600 hover:text-white transition-colors whitespace-nowrap"
                            >
                                {t('home.logout')}
                            </button>
                        </div>
                    </div>
                </header>

                {/* 2. Hero Banner (optional) */}
                <div className="px-4 mt-2 mb-4">
                    <HeroBanner />
                </div>


                {/* 3. Quick Actions Grid */}
                <div className="px-4 mb-4">
                    <QuickActionsGrid />
                </div>

                {/* 4. Sticky Search Bar */}
                <div className="sticky top-0 z-20 px-4 py-3 bg-zinc-950/95 backdrop-blur-md border-b border-zinc-900">
                    <div className="flex items-center gap-3">
                        <div className="flex-1 relative">
                            <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-zinc-500" />
                            <input
                                type="text"
                                placeholder={t('home.searchPlaceholder') || 'Search collection...'}
                                value={searchQuery}
                                onChange={(e) => setSearchQuery(e.target.value)}
                                className="w-full pl-9 pr-4 py-2.5 bg-zinc-900 border border-zinc-800 rounded-xl text-sm text-white placeholder-zinc-600 focus:outline-hidden focus:border-orange-600/50 focus:ring-1 focus:ring-orange-600/20"
                            />
                        </div>
                        <button className="p-2.5 bg-zinc-900 border border-zinc-800 rounded-xl text-zinc-500 hover:text-white hover:border-zinc-700 transition-colors">
                            <SlidersHorizontal size={18} />
                        </button>
                    </div>
                </div>

                {/* 5. Collection */}
                <div className="px-4 mt-4">
                    <div className="flex items-center justify-between mb-4">
                        <h2 className="text-lg font-bold text-zinc-50">
                            {t('home.collection')}
                        </h2>
                        <span className="text-[10px] font-bold text-zinc-500 uppercase tracking-widest">
                            {filteredBottles.length} {t('home.bottleCount')}
                        </span>
                    </div>

                    {isLoading ? (
                        <div className="flex justify-center py-20">
                            <div className="animate-spin rounded-full h-10 w-10 border-b-2 border-orange-600"></div>
                        </div>
                    ) : fetchError ? (
                        <div className="p-8 bg-zinc-900 border border-zinc-800 rounded-2xl text-center">
                            <p className="text-zinc-50 font-bold mb-2">{t('common.error')}</p>
                            <p className="text-zinc-500 text-xs mb-6">{fetchError}</p>
                            <button
                                onClick={fetchCollection}
                                className="px-6 py-3 bg-orange-600 hover:bg-orange-700 text-white rounded-xl text-xs font-bold uppercase tracking-widest transition-all"
                            >
                                {t('home.reTry')}
                            </button>
                        </div>
                    ) : filteredBottles.length > 0 ? (
                        <BottleGrid bottles={filteredBottles} />
                    ) : bottles.length > 0 ? (
                        <div className="text-center py-12 text-zinc-500">
                            <p className="text-sm">No bottles match your search</p>
                        </div>
                    ) : null}
                </div>

                {/* Footer */}
                <footer className="pb-28 pt-8 text-center">
                    <div className="flex justify-center gap-4 text-xs text-zinc-600">
                        <a href="/impressum" className="hover:text-orange-500 transition-colors">{t('home.imprint')}</a>
                        <span>•</span>
                        <a href="/privacy" className="hover:text-orange-500 transition-colors">{t('home.privacy')}</a>
                        <span>•</span>
                        <a href="/settings" className="hover:text-orange-500 transition-colors">{t('home.settings')}</a>
                    </div>
                </footer>
            </div>

            {/* Bottom Navigation with FAB */}
            <BottomNavigation
                onHome={() => window.scrollTo({ top: 0, behavior: 'smooth' })}
                onShelf={() => document.getElementById('collection')?.scrollIntoView({ behavior: 'smooth' })}
                onTastings={() => setIsTastingHubOpen(true)}
                onProfile={() => router.push('/settings')}
                onScan={handleImageSelected}
            />

            <TastingHub
                isOpen={isTastingHubOpen}
                onClose={() => setIsTastingHubOpen(false)}
            />

            <ScanAndTasteFlow
                isOpen={isFlowOpen}
                onClose={() => setIsFlowOpen(false)}
                imageFile={capturedFile}
                onBottleSaved={() => fetchCollection()}
            />
        </div>
    );
}