class Block{
    constructor(timestamp,lastHash,hash,data){
        this.timestamp = timestamp;
        this.lastHash = lastHash;
        this.hash = hash;
        this.data = data;
    }

    toString(){
        return `Block -
        Timestamp : ${this.timestamp}
        Last Hash : ${this.lastHash.substring(0,10)}
        Hash      : ${this.hash.substring(0,10)}
        Data      : ${this.data}`;
    }

    static genesis(){
        return new this('Genesis time','----','genesis-hash',[]);
    }

    static hash(timestamp,lastHash,data){
        return SHA256(`${timestamp}${lastHash}${data}`).toString();
    }

    static mineBlock(lastBlock,data){

        let hash;
        let timestamp;
        const lastHash = lastBlock.hash;

        return new this(timestamp,lastHash,hash,data);
    }
}

module.exports = Block;