// src/components/dashboard/ServiceContextSelector.jsx
//
// Persistentni selektor "Servisni kontekst" — odabir kupca + dizalice.
// Stanje se čuva u localStorage i u serviceContextStore (reaktivno).
//
// USAGE:
//   <ServiceContextSelector onNewServiceRecord={({ craneId, clientId }) => ...} />

import { useStore } from '@nanostores/preact';
import { useEffect, useState } from 'preact/hooks';
import { $clients, fetchClients } from '../../stores/clientStore';
import { $cranes } from '../../stores/fleetDashboardStore';
import { $accessToken } from '../../stores/authStore';
import ServiceRecordCreateButton from '../fleet/ServiceRecordCreateButton';
import {
    $selectedClientId, $selectedVehicleId,
    hydrateServiceContext, setSelectedClient, setSelectedVehicle, clearServiceContext,
} from '../../stores/serviceContextStore';

export default function ServiceContextSelector({ onNewServiceRecord }) {
    const clients          = useStore($clients);
    const cranes           = useStore($cranes);
    const accessToken      = useStore($accessToken);
    const selectedClientId  = useStore($selectedClientId);
    const selectedVehicleId = useStore($selectedVehicleId);

    const [editMode,   setEditMode]   = useState(false);
    const [hasMounted, setHasMounted] = useState(false);

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

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

    const fallbackClients = Array.from(
        new Map(
            cranes
                .filter((item) => item?.client && item?.client_name)
                .map((item) => [String(item.client), { id: item.client, name: item.client_name }])
        ).values()
    );
    const availableClients = clients.length > 0 ? clients : fallbackClients;

    const clientCranes   = cranes.filter((item) => String(item.client) === String(selectedClientId));
    const selectedClient  = availableClients.find((c) => String(c.id) === String(selectedClientId));
    const selectedCrane   = cranes.find((item) => String(item.id) === String(selectedVehicleId));
    const showSelector    = editMode || !selectedClientId;
    const selectedCraneLabel = (() => {
        if (!selectedCrane) return '';
        const serial = String(selectedCrane.crane_serial_number || '').trim();
        if (serial) {
            return `SN ${serial} ${selectedCrane.make || ''} ${selectedCrane.model || ''}`.trim();
        }
        return `${selectedCrane.registration_number || '-'} ${selectedCrane.make || ''} ${selectedCrane.model || ''}`.trim();
    })();

    function handleClientChange(e) {
        setSelectedClient(e.target.value);
    }

    function handleVehicleChange(e) {
        setSelectedVehicle(e.target.value);
    }

    function handleClearSelection() {
        clearServiceContext();
        setEditMode(false);
    }

    if (!hasMounted) return null;

    return (
        <div className="border-t border-border-hairline bg-canvas-base/60 px-4 py-2 sm:px-6">
            {showSelector ? (
                <div className="flex flex-wrap items-center gap-2">
                    <span className="text-xs font-medium text-text-muted">Servisni kontekst:</span>

                    <select
                        value={selectedClientId ?? ''}
                        onChange={handleClientChange}
                        className="rounded-md border border-border-hairline bg-canvas-base px-2 py-1 text-sm text-text-main focus:outline-none focus:ring-2 focus:ring-indigo-400"
                    >
                        <option value="">— Odaberi kupca —</option>
                        {availableClients.length === 0 && (
                            <option value="" disabled>Nema dostupnih kupaca</option>
                        )}
                        {availableClients.map((c) => (
                            <option key={c.id} value={c.id}>{c.name}</option>
                        ))}
                    </select>

                    {selectedClientId && (
                        <select
                            value={selectedVehicleId ?? ''}
                            onChange={handleVehicleChange}
                            className="rounded-md border border-border-hairline bg-canvas-base px-2 py-1 text-sm text-text-main focus:outline-none focus:ring-2 focus:ring-indigo-400"
                        >
                            <option value="">— Odaberi dizalicu —</option>
                            {clientCranes.length > 0
                                ? clientCranes.map((item) => (
                                    <option key={item.id} value={item.id}>
                                        {item.crane_serial_number ? `SN ${item.crane_serial_number}` : (item.registration_number || '-')} {item.make} {item.model}
                                    </option>
                                ))
                                : <option disabled>Nema dizalica za ovog kupca</option>
                            }
                        </select>
                    )}

                    {selectedClientId && selectedVehicleId && (
                        <button
                            type="button"
                            onClick={() => setEditMode(false)}
                            className="rounded-md bg-indigo-600 px-3 py-1 text-xs font-semibold text-white hover:bg-indigo-700"
                        >
                            Potvrdi
                        </button>
                    )}

                    {editMode && (
                        <button
                            type="button"
                            onClick={() => setEditMode(false)}
                            className="rounded-md border border-border-hairline px-3 py-1 text-xs text-text-muted hover:bg-canvas-deep"
                        >
                            Odustani
                        </button>
                    )}
                </div>
            ) : (
                <div className="flex flex-wrap items-center gap-3">
                    <span className="text-xs text-text-muted">Servisni kontekst:</span>

                    <span className="rounded-md bg-indigo-50 px-2 py-1 text-xs font-semibold text-indigo-700">
                        {selectedClient?.name ?? '…'}
                    </span>

                    {selectedCrane && (
                        <>
                            <span className="text-xs text-text-muted">/</span>
                            <span className="rounded-md bg-indigo-50 px-2 py-1 text-xs font-semibold text-indigo-700">
                                {selectedCraneLabel}
                            </span>
                        </>
                    )}

                    {selectedVehicleId && onNewServiceRecord && (
                        <ServiceRecordCreateButton
                            onClick={() => {
                                onNewServiceRecord({ craneId: selectedVehicleId, clientId: selectedClientId });
                            }}
                        />
                    )}

                    <button
                        type="button"
                        onClick={() => setEditMode(true)}
                        className="rounded-md border border-border-hairline px-2 py-1 text-xs text-text-muted hover:bg-canvas-deep"
                    >
                        ✎ Promijeni
                    </button>

                    <button
                        type="button"
                        onClick={handleClearSelection}
                        className="rounded-md border border-border-hairline px-2 py-1 text-xs text-text-muted hover:bg-red-50 hover:text-red-600"
                    >
                        ✕
                    </button>
                </div>
            )}
        </div>
    );
}