package main

import (
	"time"
)

// Block keeps block headers
type Block struct {
	Timestamp     int64
	Data          []byte
	PrevBlockHash []byte
	Hash          []byte
	Nonce         int
}

// Prove obtains proof of work
func (b *Block) Prove() {
	nonce, hash := Prove(b)

	b.Hash = hash[:]
	b.Nonce = nonce
}

// NewBlock creates and returns Block
func NewBlock(data string, prevBlockHash []byte) *Block {
	block := &Block{time.Now().Unix(), []byte(data), prevBlockHash, []byte{}, 0}
	block.Prove()
	return block
}

// NewGenesisBlock creates and returns genesis Block
func NewGenesisBlock() *Block {
	return NewBlock("Genesis Block", []byte{})
}