const { RpcError } = require('../index').constructors
const GZIPPacked = require('./GZIPPacked')

class RPCResult {
    static CONSTRUCTOR_ID = 0xf35c6d01;
    static classType = "constructor"

    constructor(reqMsgId, body, error) {
        this.CONSTRUCTOR_ID = 0xf35c6d01
        this.reqMsgId = reqMsgId
        this.body = body
        this.error = error
        this.classType = "constructor"
    }

    static async fromReader(reader) {
        const msgId = reader.readLong()
        const innerCode = reader.readInt(false)
        if (innerCode === RpcError.CONSTRUCTOR_ID) {
            return new RPCResult(msgId, null, RpcError.fromReader(reader))
        }
        if (innerCode === GZIPPacked.CONSTRUCTOR_ID) {
            return new RPCResult(msgId, (await GZIPPacked.fromReader(reader)).data)
        }
        reader.seek(-4)
        // This reader.read() will read more than necessary, but it's okay.
        // We could make use of MessageContainer's length here, but since
        // it's not necessary we don't need to care about it.
        return new RPCResult(msgId, reader.read(), null)
    }
}

module.exports = RPCResult