const { Reactor_CSTR, Reactor_PFR } = require('./reactor_class.js');


class nodeClass {
    /**
    * Create ReactorNode.
    * @param {object} uiConfig - Node-RED node configuration
    * @param {object} RED    - Node-RED runtime API
    * @param {object} nodeInstance - Node-RED node instance
    * @param {string} nameOfNode - Name of the node
    */
    constructor(uiConfig, RED, nodeInstance, nameOfNode) {
        // Preserve RED reference for HTTP endpoints if needed
        this.node = nodeInstance;
        this.RED = RED;
        this.name = nameOfNode;

        this._loadConfig(uiConfig)

        this._setupClass();

        this._attachInputHandler();

    }

    _attachInputHandler() { // Handle input messages
        this.node.on('input', (msg, send, done) => {
            let toggleUpdate = false;

            switch (msg.topic) {
                case "clock":
                    toggleUpdate = true;
                    break;
                case "Fluent":
                    this.reactor.setInfluent = msg;
                    if (msg.payload.inlet == 0) {
                        toggleUpdate = true;
                    }
                    break;
                case "OTR":
                    this.reactor.setOTR = msg;
                    break;
                case "Dispersion":
                    this.reactor.setDispersion = msg;
                    break;
                default:
                    console.log("Unknown topic: " + msg.topic);
            }

            if (toggleUpdate) {
                this.reactor.updateState(msg.timestamp);
                send(this.reactor.getEffluent);
            }

            if (done) {
                done();
            }
        });
    }

    _loadConfig(uiConfig) {
        this.config = {
            reactor_type: uiConfig.reactor_type,
            volume: parseFloat(uiConfig.volume),
            length: parseFloat(uiConfig.length),
            resolution_L: parseInt(uiConfig.resolution_L),
            n_inlets: parseInt(uiConfig.n_inlets),
            kla: parseFloat(uiConfig.kla),
            initialState: [
                parseFloat(uiConfig.S_O_init),
                parseFloat(uiConfig.S_I_init),
                parseFloat(uiConfig.S_S_init),
                parseFloat(uiConfig.S_NH_init),
                parseFloat(uiConfig.S_N2_init),
                parseFloat(uiConfig.S_NO_init),
                parseFloat(uiConfig.S_HCO_init),
                parseFloat(uiConfig.X_I_init),
                parseFloat(uiConfig.X_S_init),
                parseFloat(uiConfig.X_H_init),
                parseFloat(uiConfig.X_STO_init),
                parseFloat(uiConfig.X_A_init),
                parseFloat(uiConfig.X_TS_init)
            ]
        }
    }

    _setupClass() {
        let new_reactor;

        switch (this.config.reactor_type) {
            case "CSTR":
                new_reactor = new Reactor_CSTR(
                    this.config.volume,
                    this.config.n_inlets,
                    this.config.kla,
                    this.config.initialState
                );
                break;
            case "PFR":
                new_reactor = new Reactor_PFR(
                    this.config.volume,
                    this.config.length,
                    this.config.resolution_L,
                    this.config.n_inlets,
                    this.config.kla,
                    this.config.initialState
                );
                break;
            default:
                console.warn("Unknown reactor type: " + uiConfig.reactor_type);
        }

        this.reactor = new_reactor; // protect from reassignment
    }
}

module.exports = nodeClass;