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use crate::crypto::{hash, SaitoHash, SaitoPublicKey};
use bigint::uint::U256;
use serde::{Deserialize, Serialize};
use std::convert::TryInto;
extern crate hex;
#[serde_with::serde_as]
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct GoldenTicket {
target: SaitoHash,
random: SaitoHash,
#[serde_as(as = "[_; 33]")]
publickey: SaitoPublicKey,
}
impl GoldenTicket {
#[allow(clippy::new_without_default)]
pub fn new(target: SaitoHash, random: SaitoHash, publickey: SaitoPublicKey) -> Self {
return Self {
target,
random,
publickey,
};
}
pub fn generate_solution(
previous_block_hash: SaitoHash,
random_bytes: SaitoHash,
publickey: SaitoPublicKey,
) -> SaitoHash {
let mut vbytes: Vec<u8> = vec![];
vbytes.extend(&previous_block_hash);
vbytes.extend(&random_bytes);
vbytes.extend(&publickey);
hash(&vbytes)
}
pub fn is_valid_solution(solution: SaitoHash, difficulty: u64) -> bool {
let leading_zeroes_required: u64 = difficulty / 16;
let final_digit: u8 = 15 - ((difficulty % 16) as u8);
let mut target_string = String::from("");
for i in 0..64 {
if (i as u64) < leading_zeroes_required {
target_string.push('0');
} else {
if (i as u64) == leading_zeroes_required {
if final_digit == 0 {
target_string.push('0');
}
if final_digit == 1 {
target_string.push('1');
}
if final_digit == 2 {
target_string.push('2');
}
if final_digit == 3 {
target_string.push('3');
}
if final_digit == 4 {
target_string.push('4');
}
if final_digit == 5 {
target_string.push('5');
}
if final_digit == 6 {
target_string.push('6');
}
if final_digit == 7 {
target_string.push('7');
}
if final_digit == 8 {
target_string.push('8');
}
if final_digit == 9 {
target_string.push('9');
}
if final_digit == 10 {
target_string.push('A');
}
if final_digit == 11 {
target_string.push('B');
}
if final_digit == 12 {
target_string.push('C');
}
if final_digit == 13 {
target_string.push('D');
}
if final_digit == 14 {
target_string.push('E');
}
if final_digit == 15 {
target_string.push('F');
}
} else {
target_string.push('F');
}
}
}
let target_hash = hex::decode(target_string).expect("error generating target bytes array");
let sol = U256::from_big_endian(&solution);
let tgt = U256::from_big_endian(&target_hash);
if sol <= tgt {
return true;
}
return false;
}
pub fn get_target(&self) -> SaitoHash {
self.target
}
pub fn get_random(&self) -> SaitoHash {
self.random
}
pub fn get_publickey(&self) -> SaitoPublicKey {
self.publickey
}
pub fn serialize_for_transaction(&self) -> Vec<u8> {
let mut vbytes: Vec<u8> = vec![];
vbytes.extend(&self.target);
vbytes.extend(&self.random);
vbytes.extend(&self.publickey);
vbytes
}
pub fn deserialize_for_transaction(bytes: Vec<u8>) -> GoldenTicket {
let target: SaitoHash = bytes[0..32].try_into().unwrap();
let random: SaitoHash = bytes[32..64].try_into().unwrap();
let publickey: SaitoPublicKey = bytes[64..97].try_into().unwrap();
GoldenTicket::new(target, random, publickey)
}
}