// NVM-L0 共识引擎
use crate::block::Block;
use serde::{Deserialize, Serialize};

pub trait ConsensusEngine {
    fn validate_block(&self, block: &Block) -> bool;
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DagConsensus {
    difficulty: u64,
}

impl DagConsensus {
    pub fn new(difficulty: u64) -> Self {
        Self { difficulty }
    }
}

impl ConsensusEngine for DagConsensus {
    fn validate_block(&self, _block: &Block) -> bool {
        true // 简化版本
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::block::{Block, BlockHeader};
    use crate::types::{Address, Hash};
    
    #[test]
    fn test_consensus() {
        let consensus = DagConsensus::new(1000);
        let header = BlockHeader {
            number: 1,
            timestamp: 1000,
            parent_hash: Hash::zero(),
            state_root: Hash::zero(),
            tx_root: Hash::zero(),
            miner: Address::zero(),
        };
        let block = Block::new(header, Vec::new());
        assert!(consensus.validate_block(&block));
    }
}