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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the snarkVM library.

// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.

use crate::{
    testnet1::{block_header::GenesisBlockHeader, transaction_1::Transaction1},
    traits::Genesis,
};
use snarkvm_utilities::variable_length_integer::variable_length_integer;

pub struct GenesisBlock;

impl Genesis for GenesisBlock {
    const CHECKSUM: &'static str = "";
    const SIZE: u64 = 2627;

    fn load_bytes() -> Vec<u8> {
        let block_header_bytes = GenesisBlockHeader::load_bytes();
        let transactions = [Transaction1::load_bytes()];

        let mut buffer = vec![];
        buffer.extend(block_header_bytes); // Genesis block header bytes
        buffer.extend(variable_length_integer(transactions.len() as u64)); // Number of transactions
        buffer.extend(transactions.concat()); // Ordered buffer of all transaction bytes
        buffer
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_genesis_block() {
        let block = GenesisBlock::load_bytes();
        assert_eq!(GenesisBlock::SIZE, block.len() as u64);
    }
}