const tweetnacl=require('tweetnacl')
const crypto = require('crypto')
import {CurveTypeStr} from './type'
import {PublicKey} from './public_key'
import {PrivateKey} from './private_key'
export class KeyPair{
    CurveType:string=CurveTypeStr.Ed25519
    PrivateKey:PrivateKey
    PublicKey:PublicKey
    Address:string
    constructor(privateKey:PrivateKey,publicKey:PublicKey,address:string){
        this.PrivateKey=privateKey
        this.PublicKey=publicKey
        this.Address=address
    }
    static pubKeyToAddress(publicKey){
        let hasherContract =crypto.createHash('sha256')
        hasherContract.write(Buffer.from(publicKey,'hex'))
        return Buffer.from(hasherContract.digest('hex'),'hex').slice(0, 20).toString('hex')	
    }
    static generate(){
        let nckp=tweetnacl.sign.keyPair()
        let privateKey=Buffer.from(nckp.secretKey).toString('hex').toUpperCase()
        let publicKey=Buffer.from(nckp.publicKey).toString('hex').toUpperCase()
        let address=KeyPair.pubKeyToAddress(Buffer.from(nckp.publicKey).toString('hex')).toUpperCase()   
        return new  KeyPair(new PrivateKey(privateKey),new PublicKey(publicKey),address)
    }
    sign(msg:Buffer){
        return this.PrivateKey.sign(msg)
    }
    verify(msg:Buffer,signData:Uint8Array){
        return this.PublicKey.verify(msg,signData)
    }
}