const tweetnacl=require('tweetnacl')
import {CurveTypeStr} from './type'
export class PrivateKey{
    CurveType:string=CurveTypeStr.Ed25519
    PrivateKey:string
    constructor(privateKey:string){
        this.PrivateKey=privateKey
    }
    setCurveType(curveType){
        this.CurveType=curveType
    }
    sign(msg:Buffer){
        switch (this.CurveType){
            case CurveTypeStr.Ed25519:
                let msgArray=Uint8Array.from(msg)
                return tweetnacl.sign.detached(msgArray, Buffer.from(this.PrivateKey,'hex'))  
            case CurveTypeStr.Secp256k1:
                throw new Error('CurveType Secp256k1 is not implemented')
            default:
                throw new Error('invalid curve type')
        }
    }
}