'use client';

import React, { useState, useEffect } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { X, Loader2, Sparkles, AlertCircle } from 'lucide-react';
import TastingEditor from './TastingEditor';
import SessionBottomSheet from './SessionBottomSheet';
import ResultCard from './ResultCard';
import { useSession } from '@/context/SessionContext';
import { magicScan } from '@/services/magic-scan';
import { saveBottle } from '@/services/save-bottle';
import { saveTasting } from '@/services/save-tasting';
import { BottleMetadata } from '@/types/whisky';
import { useI18n } from '@/i18n/I18nContext';
import { createClient } from '@/lib/supabase/client';

type FlowState = 'IDLE' | 'SCANNING' | 'EDITOR' | 'RESULT' | 'ERROR';

interface ScanAndTasteFlowProps {
    isOpen: boolean;
    onClose: () => void;
    base64Image: string | null;
}

export default function ScanAndTasteFlow({ isOpen, onClose, base64Image }: ScanAndTasteFlowProps) {
    const [state, setState] = useState<FlowState>('IDLE');
    const [isSessionsOpen, setIsSessionsOpen] = useState(false);
    const { activeSession } = useSession();
    const [tastingData, setTastingData] = useState<any>(null);
    const [bottleMetadata, setBottleMetadata] = useState<BottleMetadata | null>(null);
    const [error, setError] = useState<string | null>(null);
    const [isSaving, setIsSaving] = useState(false);
    const { locale } = useI18n();
    const supabase = createClient();

    // Trigger scan when open and image provided
    useEffect(() => {
        if (isOpen && base64Image) {
            console.log('[ScanFlow] Starting handleScan...');
            handleScan(base64Image);
        } else if (!isOpen) {
            setState('IDLE');
            setTastingData(null);
            setBottleMetadata(null);
            setError(null);
            setIsSaving(false);
        }
    }, [isOpen, base64Image]);

    const handleScan = async (image: string) => {
        setState('SCANNING');
        setError(null);

        try {
            const cleanBase64 = image.split(',')[1] || image;
            console.log('[ScanFlow] Calling magicScan service...');
            const result = await magicScan(cleanBase64, 'gemini', locale);

            if (result.success && result.data) {
                console.log('[ScanFlow] magicScan success');
                setBottleMetadata(result.data);
                setState('EDITOR');
            } else {
                console.error('[ScanFlow] magicScan failure:', result.error);
                throw new Error(result.error || 'Flasche konnte nicht erkannt werden.');
            }
        } catch (err: any) {
            console.error('[ScanFlow] handleScan error:', err);
            setError(err.message);
            setState('ERROR');
        }
    };

    const handleSaveTasting = async (formData: any) => {
        if (!bottleMetadata || !base64Image) return;

        setIsSaving(true);
        setError(null);

        try {
            const { data: { user } = {} } = await supabase.auth.getUser();
            if (!user) throw new Error('Nicht autorisiert');

            // 1. Save Bottle
            const bottleResult = await saveBottle(bottleMetadata, base64Image, user.id);
            if (!bottleResult.success || !bottleResult.data) {
                throw new Error(bottleResult.error || 'Fehler beim Speichern der Flasche');
            }

            const bottleId = bottleResult.data.id;

            // 2. Save Tasting
            const tastingNote = {
                ...formData,
                bottle_id: bottleId,
            };

            const tastingResult = await saveTasting(tastingNote);
            if (!tastingResult.success) {
                throw new Error(tastingResult.error || 'Fehler beim Speichern des Tastings');
            }

            setTastingData(tastingNote);
            setState('RESULT');
        } catch (err: any) {
            setError(err.message);
            setState('ERROR');
        } finally {
            setIsSaving(false);
        }
    };

    const handleShare = async () => {
        if (navigator.share) {
            try {
                await navigator.share({
                    title: `My Tasting: ${bottleMetadata?.name || 'Whisky'}`,
                    text: `Check out my tasting results for ${bottleMetadata?.distillery} ${bottleMetadata?.name}!`,
                    url: window.location.href,
                });
            } catch (err) {
                console.error('Share failed:', err);
            }
        } else {
            alert('Sharing is not supported on this browser.');
        }
    };

    return (
        <AnimatePresence>
            {isOpen && (
                <motion.div
                    initial={{ opacity: 0 }}
                    animate={{ opacity: 1 }}
                    exit={{ opacity: 0 }}
                    className="fixed inset-0 z-[60] bg-[#0F1014] flex flex-col h-[100dvh] w-screen overflow-hidden overscroll-none"
                >
                    {/* Close Button */}
                    <button
                        onClick={onClose}
                        className="absolute top-6 right-6 z-[70] p-2 rounded-full bg-white/5 border border-white/10 text-white/60 hover:text-white transition-colors"
                    >
                        <X size={24} />
                    </button>

                    <div className="flex-1 w-full h-full flex flex-col relative min-h-0">
                        {/* 
                            Robust state check: 
                            If we are IDLE but have an image, we are essentially SCANNING (or about to be).
                            If we have no image, we shouldn't really be here, but show error just in case.
                        */}
                        {(state === 'SCANNING' || (state === 'IDLE' && base64Image)) && (
                            <div className="flex-1 flex flex-col items-center justify-center">
                                <motion.div
                                    initial={{ scale: 0.9, opacity: 0 }}
                                    animate={{ scale: 1, opacity: 1 }}
                                    className="flex flex-col items-center gap-6"
                                >
                                    <div className="relative">
                                        <motion.div
                                            animate={{ rotate: 360 }}
                                            transition={{ duration: 3, repeat: Infinity, ease: "linear" }}
                                            className="w-32 h-32 rounded-full border-2 border-dashed border-[#C89D46]/30"
                                        />
                                        <div className="absolute inset-0 flex items-center justify-center">
                                            <Loader2 size={48} className="animate-spin text-[#C89D46]" />
                                        </div>
                                    </div>
                                    <div className="text-center space-y-2">
                                        <h2 className="text-2xl font-display font-bold text-white uppercase tracking-tight">Analysiere Etikett...</h2>
                                        <p className="text-[#C89D46] font-sans font-bold uppercase tracking-widest text-[10px] flex items-center justify-center gap-2">
                                            <Sparkles size={12} /> KI-gestütztes Scanning
                                        </p>
                                    </div>
                                </motion.div>
                            </div>
                        )}

                        {state === 'ERROR' && (
                            <div className="flex-1 flex flex-col items-center justify-center">
                                <motion.div
                                    initial={{ scale: 0.9, opacity: 0 }}
                                    animate={{ scale: 1, opacity: 1 }}
                                    className="flex flex-col items-center gap-6 p-8 text-center"
                                >
                                    <div className="w-20 h-20 rounded-full bg-red-500/10 flex items-center justify-center text-red-500">
                                        <AlertCircle size={40} />
                                    </div>
                                    <div className="space-y-2">
                                        <h2 className="text-2xl font-display font-bold text-white uppercase tracking-tight">Ups! Da lief was schief.</h2>
                                        <p className="text-white/60 text-sm max-w-xs mx-auto font-sans">{error || 'Wir konnten die Flasche leider nicht erkennen. Bitte versuch es mit einem anderen Foto.'}</p>
                                    </div>
                                    <button
                                        onClick={onClose}
                                        className="px-8 py-4 bg-white text-[#0F1014] rounded-2xl font-sans font-bold uppercase tracking-widest text-[10px] hover:bg-white/90 transition-all"
                                    >
                                        Schließen
                                    </button>
                                </motion.div>
                            </div>
                        )}

                        {state === 'EDITOR' && bottleMetadata && (
                            <motion.div
                                key="editor"
                                initial={{ y: 50, opacity: 0 }}
                                animate={{ y: 0, opacity: 1 }}
                                exit={{ y: -50, opacity: 0 }}
                                className="flex-1 w-full h-full flex flex-col min-h-0"
                            >
                                <TastingEditor
                                    bottleMetadata={bottleMetadata}
                                    image={base64Image}
                                    onSave={handleSaveTasting}
                                    onOpenSessions={() => setIsSessionsOpen(true)}
                                    activeSessionName={activeSession?.name}
                                    activeSessionId={activeSession?.id}
                                />
                            </motion.div>
                        )}

                        {(isSaving) && (
                            <motion.div
                                initial={{ opacity: 0 }}
                                animate={{ opacity: 1 }}
                                className="absolute inset-0 z-[80] bg-[#0F1014]/80 backdrop-blur-sm flex flex-col items-center justify-center gap-6"
                            >
                                <Loader2 size={48} className="animate-spin text-[#C89D46]" />
                                <h2 className="text-xl font-display font-bold text-white uppercase tracking-tight">Speichere Tasting...</h2>
                            </motion.div>
                        )}

                        {state === 'RESULT' && tastingData && bottleMetadata && (
                            <div className="flex-1 overflow-y-auto">
                                <div className="min-h-full flex flex-col items-center justify-center py-20 px-6">
                                    <motion.div
                                        key="result"
                                        initial={{ scale: 0.8, opacity: 0 }}
                                        animate={{ scale: 1, opacity: 1 }}
                                        className="w-full max-w-sm"
                                    >
                                        <ResultCard
                                            data={{
                                                ...tastingData,
                                                complexity: tastingData.complexity || 75,
                                                balance: tastingData.balance || 85,
                                            }}
                                            bottleName={bottleMetadata.name || 'Unknown Whisky'}
                                            image={base64Image}
                                            onShare={handleShare}
                                        />
                                    </motion.div>
                                </div>
                            </div>
                        )}
                    </div>

                    <SessionBottomSheet
                        isOpen={isSessionsOpen}
                        onClose={() => setIsSessionsOpen(false)}
                    />
                </motion.div>
            )}
        </AnimatePresence>
    );
}