// src/components/crm/ClientsSection.jsx
// Prikaz liste klijenata i njihovih dizalica unutar dashboard sekcije.

import { useStore } from '@nanostores/preact';
import { useEffect, useState } from 'preact/hooks';
import { animated, useTransition } from '@react-spring/web';
import { $clients, $clientsLoading, fetchClients } from '../../stores/clientStore';
import { $cranes } from '../../stores/fleetDashboardStore';
import AnimatedDataTable from '../ui/AnimatedDataTable';
import ServiceRecordCreateButton from '../fleet/ServiceRecordCreateButton';
import { showToast } from '../../stores/toastStore';

export default function ClientsSection({ onSetServiceContext = null }) {
    const clients = useStore($clients);
    const loading = useStore($clientsLoading);
    const cranes = useStore($cranes);
    const [expandedId, setExpandedId] = useState(null);
    const [hasMounted, setHasMounted] = useState(false);
    const [selectedClientCraneId, setSelectedClientCraneId] = useState(null);

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

    useEffect(() => {
        if (!hasMounted) return;
        if (clients.length === 0) fetchClients();
    }, [hasMounted, clients.length]);

    function cranesForClient(clientId) {
        return cranes.filter((item) => String(item.client) === String(clientId));
    }

    const clientTransitions = useTransition(clients, {
        keys: (client) => client.id,
        from: { opacity: 0, transform: 'translate3d(0,8px,0)' },
        enter: { opacity: 1, transform: 'translate3d(0,0,0)' },
        leave: { opacity: 0, transform: 'translate3d(0,-8px,0)' },
        trail: 30,
        config: { tension: 230, friction: 26 },
    });

    function handleSetServiceContext() {
        if (!selectedClientCraneId) {
            showToast('Prvo označite redak dizalice.', 'warning');
            return;
        }
        onSetServiceContext?.(selectedClientCraneId);
    }

    return (
        <article className="overflow-hidden rounded-xl border border-border-hairline bg-canvas-elevated shadow-sm">
            <div className="flex items-center justify-between border-b border-border-hairline px-4 py-3">
                <h3 className="font-semibold text-text-main">Klijenti</h3>
                <div className="flex items-center gap-3">
                    <ServiceRecordCreateButton
                        onClick={handleSetServiceContext}
                        label="Postavi servisni kontekst"
                    />
                    <button
                        type="button"
                        onClick={() => fetchClients()}
                        className="text-sm font-medium text-indigo-600 hover:text-indigo-800"
                    >
                        Osvježi
                    </button>
                </div>
            </div>

            {!hasMounted && (
                <p className="px-4 py-6 text-center text-sm text-text-muted">Učitavanje…</p>
            )}

            {hasMounted && loading && (
                <p className="px-4 py-6 text-center text-sm text-text-muted">Učitavanje…</p>
            )}

            {hasMounted && !loading && clients.length === 0 && (
                <p className="px-4 py-6 text-center text-sm text-text-muted">
                    Nema klijenata. Dodajte klijente u Django admin ili koristite CRM API.
                </p>
            )}

            {hasMounted && !loading && clients.length > 0 && (
                <div className="divide-y divide-border-hairline">
                    {clientTransitions((style, client) => {
                        const cvs = cranesForClient(client.id);
                        const isOpen = expandedId === client.id;
                        const craneColumns = [
                            { key: 'registration', label: 'Oznaka', className: 'py-2 pr-4 text-left' },
                            { key: 'model', label: 'Make / Model', className: 'py-2 pr-4 text-left' },
                            { key: 'km', label: 'Km', className: 'py-2 pr-4 text-left' },
                            { key: 'nextService', label: 'Sljedeći servis', className: 'py-2 pr-4 text-left' },
                            { key: 'type', label: 'Vrsta', className: 'py-2 text-left' },
                        ];
                        return (
                            <animated.div key={client.id} style={style}>
                                <button
                                    type="button"
                                    onClick={() => {
                                        setExpandedId(isOpen ? null : client.id);
                                        setSelectedClientCraneId(null);
                                    }}
                                    className="flex w-full items-center justify-between px-4 py-3 text-left hover:bg-canvas-deep"
                                >
                                    <div>
                                        <span className="font-medium text-text-main">{client.name}</span>
                                        <span className="ml-2 text-xs text-text-muted">{client.tax_id}</span>
                                        <span className="ml-3 text-xs text-text-muted">{client.city}</span>
                                    </div>
                                    <div className="flex items-center gap-2">
                                        <span className="rounded-full bg-indigo-50 px-2 py-0.5 text-xs text-indigo-700">
                                            {cvs.length} dizalica
                                        </span>
                                        <span className="text-text-muted">{isOpen ? '▲' : '▼'}</span>
                                    </div>
                                </button>

                                {isOpen && (
                                    <div className="border-t border-border-hairline bg-canvas-base/50 px-4 py-3">
                                        {cvs.length === 0 ? (
                                            <p className="text-sm text-text-muted">
                                                Nema dizalica dodijeljenih ovom klijentu.
                                                Dodajte dizalicu u Django admin i povežite je s klijentom.
                                            </p>
                                        ) : (
                                            <AnimatedDataTable
                                                columns={craneColumns}
                                                rows={cvs}
                                                rowKey={(item) => item.id}
                                                headClassName="text-xs uppercase tracking-wide text-text-muted"
                                                bodyClassName="divide-y divide-border-hairline"
                                                rowClassName="hover:bg-canvas-deep"
                                                isRowSelected={(item) => String(item.id) === String(selectedClientCraneId)}
                                                tableClassName="min-w-full text-sm"
                                                wrapperClassName="overflow-x-auto"
                                                renderRow={(item) => (
                                                    <>
                                                        <td className="py-2 pr-4 font-medium cursor-pointer" onClick={() => setSelectedClientCraneId(item.id)}>{item.registration_number}</td>
                                                        <td className="py-2 pr-4 cursor-pointer" onClick={() => setSelectedClientCraneId(item.id)}>{item.make} {item.model} {item.year ? `(${item.year})` : ''}</td>
                                                        <td className="py-2 pr-4 cursor-pointer" onClick={() => setSelectedClientCraneId(item.id)}>{item.current_mileage?.toLocaleString('hr-HR')} km</td>
                                                        <td className="py-2 pr-4 cursor-pointer" onClick={() => setSelectedClientCraneId(item.id)}>
                                                            {item.service_interval_km
                                                                ? `${(Math.floor(item.current_mileage / item.service_interval_km) + 1) * item.service_interval_km} km`
                                                                : '—'}
                                                        </td>
                                                        <td className="py-2 cursor-pointer" onClick={() => setSelectedClientCraneId(item.id)}>
                                                            <span className={item.is_company_vehicle
                                                                ? 'rounded-full bg-indigo-50 px-2 py-0.5 text-xs text-indigo-700'
                                                                : 'rounded-full bg-emerald-50 px-2 py-0.5 text-xs text-emerald-700'
                                                            }>
                                                                {item.is_company_vehicle ? 'Fleet' : 'Kupac'}
                                                            </span>
                                                        </td>
                                                    </>
                                                )}
                                            />
                                        )}
                                    </div>
                                )}
                            </animated.div>
                        );
                    })}
                </div>
            )}
        </article>
    );
}