// Writes to state.rooms.cmd_livingroom (NVL variable cmd_livingroom).
const ROOM_NAME = 'cmd_livingroom';
const entityId = (msg.topic || '').toString();
const parts = entityId.split('_');
const last = parts[parts.length - 1] || '';
const num = parseInt(last, 10);
const lightNum = (!isNaN(num) && num >= 1) ? Math.min(6, num) : 1;

// Normalize state: HA / trigger-state can send payload as string, object with .state, or data.new_state.state
let rawState = msg.payload;
if (rawState !== null && typeof rawState === 'object' && rawState.state !== undefined) rawState = rawState.state;
if (msg.data && msg.data.new_state && msg.data.new_state.state !== undefined) rawState = msg.data.new_state.state;
const isOn = (rawState === 'on' || rawState === true);

node.warn('[HA to NVL] topic=' + entityId + ' rawState=' + JSON.stringify(rawState) + ' → lightNum=' + lightNum + ' isOn=' + isOn);

if (!flow.get('nvlInState')) flow.set('nvlInState', { rooms: {}, boiler: {} });
const state = flow.get('nvlInState');
if (!state.rooms[ROOM_NAME]) state.rooms[ROOM_NAME] = {};
const r = state.rooms[ROOM_NAME];
r['ha_l' + lightNum + '_on'] = false;
r['ha_l' + lightNum + '_off'] = false;
if (isOn) r['ha_l' + lightNum + '_on'] = true;
else r['ha_l' + lightNum + '_off'] = true;
flow.set('nvlInState', state);

node.warn('[HA to NVL] set cmd_livingroom ha_l' + lightNum + '_' + (isOn ? 'on' : 'off') + '=true, buildAndSend');

// PLC uses R_TRIG (rising edge). If "off" still doesn’t work, add a flow: after this node, 80ms delay then clear ha_l*_off and buildAndSend again (pulse).
msg.payload = { buildAndSend: true };
return msg;