//! NAC宪法执行引擎(CEE)
//! Constitutional Execution Engine

use nac_udm::primitives::{Address, Hash};
use serde::{Deserialize, Serialize};
use thiserror::Error;

#[derive(Debug, Error)]
pub enum CeeError {
    #[error("Clause not found: {0}")]
    ClauseNotFound(u64),
    
    #[error("Validation failed: {0}")]
    ValidationFailed(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionContext {
    pub caller: Address,
    pub timestamp: u64,
    pub clause_index: u64,
}

pub struct ConstitutionalExecutionEngine {
    validated_txs: Vec<Hash>,
}

impl ConstitutionalExecutionEngine {
    pub fn new() -> Self {
        Self {
            validated_txs: Vec::new(),
        }
    }

    pub fn validate_transaction(
        &mut self,
        tx_hash: Hash,
        _context: &ExecutionContext,
    ) -> Result<bool, CeeError> {
        self.validated_txs.push(tx_hash);
        Ok(true)
    }

    pub fn get_validated_count(&self) -> usize {
        self.validated_txs.len()
    }
}

impl Default for ConstitutionalExecutionEngine {
    fn default() -> Self {
        Self::new()
    }
}