"use client";

import React, { useState, useEffect } from 'react';
import { PlusCircle, Edit3, Trash2, ShoppingBag, Image as ImageIcon, Loader2, AlertCircle } from 'lucide-react';
import { Offer, OfferType } from '../../types';
import { toast } from 'react-hot-toast';

interface DashboardOffersProps {
    businessId: string;
    plan?: string;
}

const DashboardOffers = ({ businessId, plan = 'STARTER' }: DashboardOffersProps) => {
    const [offers, setOffers] = useState<Offer[]>([]);
    const [loading, setLoading] = useState(true);
    const [isModalOpen, setIsModalOpen] = useState(false);
    const [saving, setSaving] = useState(false);
    const [currentOffer, setCurrentOffer] = useState<Partial<Offer>>({
        title: '',
        price: 0,
        currency: 'XOF',
        type: OfferType.SERVICE,
        description: '',
        imageUrl: '',
        active: true
    });

    const fetchOffers = async () => {
        if (!businessId || businessId === 'new') {
            setLoading(false);
            return;
        }
        
        setLoading(true);
        try {
            const res = await fetch(`/api/offers?businessId=${businessId}`);
            const data = await res.json();
            if (data.error) {
                toast.error(data.error);
            } else {
                setOffers(data);
            }
        } catch (error) {
            console.error('Error fetching offers:', error);
            toast.error('Erreur lors du chargement des offres');
        } finally {
            setLoading(false);
        }
    };

    useEffect(() => {
        fetchOffers();
    }, [businessId]);

    const handleDelete = async (id: string) => {
        if (window.confirm("Voulez-vous vraiment supprimer cette offre ?")) {
            try {
                const res = await fetch(`/api/offers/${id}`, {
                    method: 'DELETE'
                });
                const data = await res.json();
                if (data.error) {
                    toast.error(data.error);
                } else {
                    setOffers(offers.filter(o => o.id !== id));
                    toast.success('Offre supprimée');
                }
            } catch (error) {
                console.error('Delete error:', error);
                toast.error('Erreur lors de la suppression');
            }
        }
    };

    const handleEdit = (offer: Offer) => {
        setCurrentOffer(offer);
        setIsModalOpen(true);
    };

    const openAddModal = () => {
        setCurrentOffer({
            title: '',
            price: 0,
            currency: 'XOF',
            type: OfferType.SERVICE,
            description: '',
            imageUrl: '',
            active: true,
            businessId: businessId
        });
        setIsModalOpen(true);
    };

    const handleSave = async (e: React.FormEvent) => {
        e.preventDefault();
        setSaving(true);
        
        try {
            const isEdit = !!currentOffer.id;
            const url = isEdit ? `/api/offers/${currentOffer.id}` : '/api/offers';
            const method = isEdit ? 'PATCH' : 'POST';
            
            // Generate a random image if none provided
            const finalImageUrl = currentOffer.imageUrl || `https://picsum.photos/400/300?random=${Date.now()}`;
            
            const payload = {
                ...currentOffer,
                businessId,
                imageUrl: finalImageUrl,
                price: Number(currentOffer.price)
            };

            const res = await fetch(url, {
                method,
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(payload)
            });
            
            const data = await res.json();
            
            if (data.error) {
                toast.error(data.error);
            } else {
                if (isEdit) {
                    setOffers(offers.map(o => o.id === data.id ? data : o));
                } else {
                    setOffers([data, ...offers]);
                }
                toast.success(isEdit ? 'Offre mise à jour' : 'Offre publiée');
                setIsModalOpen(false);
            }
        } catch (error) {
            console.error('Save error:', error);
            toast.error('Erreur lors de la sauvegarde');
        } finally {
            setSaving(false);
        }
    };

    if (loading) {
        return (
            <div className="flex flex-col items-center justify-center py-20">
                <Loader2 className="w-10 h-10 text-brand-600 animate-spin" />
                <p className="mt-4 text-gray-500 font-medium">Chargement de vos offres...</p>
            </div>
        );
    }

    if (businessId === 'new') {
        return (
            <div className="text-center py-12 bg-white rounded-lg border-2 border-dashed border-gray-300">
                <ShoppingBag className="mx-auto h-12 w-12 text-gray-400" />
                <h3 className="mt-2 text-sm font-medium text-gray-900">Pas encore d'entreprise</h3>
                <p className="mt-1 text-sm text-gray-500">Veuillez d'abord créer votre fiche entreprise avant d'ajouter des offres.</p>
            </div>
        );
    }

    const offerLimit = plan === 'BOOSTER' ? 10 : (plan === 'EMPIRE' ? 1000 : 1);
    const isLimitReached = offers.length >= offerLimit;

    return (
        <div className="space-y-6">
            <div className="flex justify-between items-center">
                <div className="flex flex-col">
                    <h2 className="text-2xl font-bold font-serif text-gray-900">Mes Offres</h2>
                    <p className="text-xs text-gray-500 mt-1">
                        Utilisation : <span className="font-bold">{offers.length} / {offerLimit === 1000 ? 'Illimité' : offerLimit}</span>
                    </p>
                </div>
                <button 
                    onClick={openAddModal} 
                    disabled={isLimitReached}
                    className={`flex items-center px-4 py-2 rounded-md font-medium text-sm shadow-sm transition-colors active:scale-95 ${isLimitReached ? 'bg-gray-300 text-gray-500 cursor-not-allowed' : 'bg-brand-600 text-white hover:bg-brand-700'}`}
                >
                    <PlusCircle className="w-4 h-4 mr-2" />
                    Ajouter une offre
                </button>
            </div>

            {isLimitReached && (
                <div className="bg-orange-50 border border-orange-200 rounded-lg p-3 flex items-center justify-between">
                    <div className="flex items-center gap-2">
                        <AlertCircle className="w-5 h-5 text-orange-600" />
                        <p className="text-sm text-orange-800">
                            Vous avez atteint la limite de votre plan <strong>{plan}</strong>.
                        </p>
                    </div>
                    <button className="text-xs font-bold text-brand-600 hover:text-brand-700 uppercase tracking-tight">
                        Passer au plan supérieur →
                    </button>
                </div>
            )}

            {/* List View */}
            {offers.length > 0 ? (
                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
                    {offers.map(offer => (
                        <div key={offer.id} className="bg-white rounded-lg shadow border border-gray-200 overflow-hidden group flex flex-col">
                            <div className="relative h-40 bg-gray-200">
                                <img src={offer.imageUrl} alt={offer.title} className="w-full h-full object-cover" />
                                <div className="absolute top-2 right-2">
                                    <span className={`px-2 py-1 text-[10px] font-bold rounded uppercase ${offer.type === OfferType.PRODUCT ? 'bg-blue-100 text-blue-800' : 'bg-purple-100 text-purple-800'}`}>
                                        {offer.type === OfferType.PRODUCT ? 'Produit' : 'Service'}
                                    </span>
                                </div>
                            </div>
                            <div className="p-4 flex-1 flex flex-col">
                                <h3 className="font-bold text-gray-900 truncate">{offer.title}</h3>
                                <p className="text-brand-600 font-bold mt-1">
                                    {new Intl.NumberFormat('fr-FR').format(offer.price)} {offer.currency}
                                </p>
                                {offer.description && (
                                    <p className="text-xs text-gray-500 mt-2 line-clamp-2 italic">
                                        {offer.description}
                                    </p>
                                )}
                                <div className="mt-auto pt-4 border-t border-gray-100 flex justify-between items-center">
                                    <span className={`inline-flex items-center px-2 py-0.5 rounded text-[10px] font-bold uppercase ${offer.active ? 'bg-green-100 text-green-700' : 'bg-red-100 text-red-700'}`}>
                                        {offer.active ? 'Actif' : 'Inactif'}
                                    </span>
                                    <div className="flex space-x-2">
                                        <button onClick={() => handleEdit(offer)} className="p-1.5 text-gray-400 hover:text-brand-600 hover:bg-brand-50 rounded-md transition-colors" title="Modifier">
                                            <Edit3 className="w-4 h-4" />
                                        </button>
                                        <button onClick={() => handleDelete(offer.id)} className="p-1.5 text-gray-400 hover:text-red-600 hover:bg-red-50 rounded-md transition-colors" title="Supprimer">
                                            <Trash2 className="w-4 h-4" />
                                        </button>
                                    </div>
                                </div>
                            </div>
                        </div>
                    ))}
                </div>
            ) : (
                <div className="text-center py-12 bg-white rounded-lg border-2 border-dashed border-gray-300">
                    <ShoppingBag className="mx-auto h-12 w-12 text-gray-400" />
                    <h3 className="mt-2 text-sm font-medium text-gray-900">Aucune offre</h3>
                    <p className="mt-1 text-sm text-gray-500">Commencez à vendre vos produits ou services.</p>
                </div>
            )}

            {/* Modal */}
            {isModalOpen && (
                <div className="fixed inset-0 z-50 overflow-y-auto" aria-labelledby="modal-title" role="dialog" aria-modal="true">
                    <div className="flex items-end justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
                        <div className="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" aria-hidden="true" onClick={() => !saving && setIsModalOpen(false)}></div>
                        <span className="hidden sm:inline-block sm:align-middle sm:h-screen" aria-hidden="true">&#8203;</span>
                        <div className="relative z-10 inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-lg w-full">
                            <form onSubmit={handleSave}>
                                <div className="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
                                    <div className="sm:flex sm:items-start">
                                        <div className="mx-auto flex-shrink-0 flex items-center justify-center h-12 w-12 rounded-full bg-brand-100 sm:mx-0 sm:h-10 sm:w-10">
                                            <ShoppingBag className="h-6 w-6 text-brand-600" />
                                        </div>
                                        <div className="mt-3 text-center sm:mt-0 sm:ml-4 sm:text-left w-full">
                                            <h3 className="text-lg leading-6 font-bold text-gray-900" id="modal-title">
                                                {currentOffer.id ? 'Modifier l\'offre' : 'Ajouter une offre'}
                                            </h3>
                                            <div className="mt-4 space-y-4">
                                                <div>
                                                    <label className="block text-sm font-medium text-gray-700">Type d'offre</label>
                                                    <div className="mt-2 flex space-x-4">
                                                        <label className="inline-flex items-center cursor-pointer">
                                                            <input type="radio" className="form-radio text-brand-600 w-4 h-4" name="type" checked={currentOffer.type === OfferType.PRODUCT} onChange={() => setCurrentOffer({...currentOffer, type: OfferType.PRODUCT})} />
                                                            <span className="ml-2 text-sm font-medium text-gray-700">Produit Physique</span>
                                                        </label>
                                                        <label className="inline-flex items-center cursor-pointer">
                                                            <input type="radio" className="form-radio text-brand-600 w-4 h-4" name="type" checked={currentOffer.type === OfferType.SERVICE} onChange={() => setCurrentOffer({...currentOffer, type: OfferType.SERVICE})} />
                                                            <span className="ml-2 text-sm font-medium text-gray-700">Service / Prestation</span>
                                                        </label>
                                                    </div>
                                                </div>
                                                <div>
                                                    <label className="block text-sm font-medium text-gray-700">Titre</label>
                                                    <input type="text" required className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm py-2 px-3 sm:text-sm focus:ring-brand-500 focus:border-brand-500" value={currentOffer.title || ''} onChange={e => setCurrentOffer({...currentOffer, title: e.target.value})} placeholder="Ex: Savon Karité Bio" />
                                                </div>
                                                <div>
                                                    <label className="block text-sm font-medium text-gray-700">Description (optionnel)</label>
                                                    <textarea rows={2} className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm py-2 px-3 sm:text-sm focus:ring-brand-500 focus:border-brand-500" value={currentOffer.description || ''} onChange={e => setCurrentOffer({...currentOffer, description: e.target.value})} placeholder="Courte description de l'offre..." />
                                                </div>
                                                <div className="grid grid-cols-2 gap-4">
                                                    <div>
                                                        <label className="block text-sm font-medium text-gray-700">Prix</label>
                                                        <input type="number" required min="0" className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm py-2 px-3 sm:text-sm focus:ring-brand-500 focus:border-brand-500" value={currentOffer.price || 0} onChange={e => setCurrentOffer({...currentOffer, price: parseInt(e.target.value) || 0})} />
                                                    </div>
                                                    <div>
                                                        <label className="block text-sm font-medium text-gray-700">Devise</label>
                                                        <select className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm py-2 px-3 sm:text-sm focus:ring-brand-500 focus:border-brand-500" value={currentOffer.currency || 'XOF'} onChange={e => setCurrentOffer({...currentOffer, currency: e.target.value as any})}>
                                                            <option value="XOF">FCFA (XOF)</option>
                                                            <option value="EUR">EUR (€)</option>
                                                        </select>
                                                    </div>
                                                </div>
                                                <div>
                                                    <label className="block text-sm font-medium text-gray-700">Lien Image (optionnel)</label>
                                                    <input type="text" className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm py-2 px-3 sm:text-sm focus:ring-brand-500 focus:border-brand-500" value={currentOffer.imageUrl || ''} onChange={e => setCurrentOffer({...currentOffer, imageUrl: e.target.value})} placeholder="https://..." />
                                                    <p className="mt-1 text-[10px] text-gray-500 italic">Laissez vide pour utiliser une image aléatoire.</p>
                                                </div>
                                                <div className="flex items-center">
                                                    <input id="active" type="checkbox" className="h-4 w-4 text-brand-600 focus:ring-brand-500 border-gray-300 rounded" checked={!!currentOffer.active} onChange={e => setCurrentOffer({...currentOffer, active: e.target.checked})} />
                                                    <label htmlFor="active" className="ml-2 block text-sm text-gray-900">Afficher cette offre publiquement</label>
                                                </div>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                                <div className="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
                                    <button 
                                        type="submit" 
                                        disabled={saving}
                                        className="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-6 py-2 bg-brand-600 text-base font-bold text-white hover:bg-brand-700 focus:outline-none sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50 disabled:cursor-not-allowed transition-all"
                                    >
                                        {saving ? (
                                            <>
                                                <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                                                Enregistrement...
                                            </>
                                        ) : (
                                            currentOffer.id ? 'Mettre à jour' : 'Publier l\'offre'
                                        )}
                                    </button>
                                    <button 
                                        type="button" 
                                        onClick={() => setIsModalOpen(false)} 
                                        disabled={saving}
                                        className="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 shadow-sm px-4 py-2 bg-white text-base font-medium text-gray-700 hover:bg-gray-50 focus:outline-none sm:mt-0 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
                                    >
                                        Annuler
                                    </button>
                                </div>
                            </form>
                        </div>
                    </div>
                </div>
            )}
        </div>
    );
};

export default DashboardOffers;