const config = require("../../../config");

const opcodes = {
    0: "HELLO"
};

const parseMessage = (message) => {
    if (typeof message !== "string") throw new Error("GatewayMessageParser: Message is not a string");
    if (message.length < 1) throw new Error("GatewayMessageParser: Message has less than 1 character");
    if (message.length > config.gatewayMaxStringPayloadLength) throw new Error(`GatewayMessageParser: Message has more than ${config.gatewayMaxStringPayloadLength} characters`);
    const op = parseInt(message[0]);
    if (!op || isNaN(op)) throw new Error("GatewayMessageParser: Message has invalid opcode");      
    const opcodeName = opcodes[op];
    if (!opcodeName) throw new Error("GatewayMessageParser: Message has unknown opcode");

};

module.exports = { parseMessage };