anya-core 1.2.0

// Smart Contract Execution Port - Miniscript Support
// Bitcoin Development Framework v2.5 - Hexagonal Architecture

use crate::ports::Port;

/// Contract type
#[derive(Debug, Clone, PartialEq)]
pub enum ContractType {
    P2PKH,
    P2SH,
    P2WSH,
    P2TR, // Taproot
    P2TR_Script, // Taproot script path
}

/// Simplified Miniscript structure
#[derive(Debug, Clone)]
pub struct MiniscriptPolicy {
    pub expression: String,
    pub contract_type: ContractType,
}

/// Contract execution result
#[derive(Debug, Clone)]
pub enum ExecutionResult {
    Success,
    Failure(String),
    Pending,
}

/// Contract port implementation with Miniscript support
pub struct ContractPort {
    connected: bool,
    has_taproot_support: bool,
    compiled_contracts: Vec<(String, MiniscriptPolicy)>,
}

impl ContractPort {
    pub fn new() -> Self {
        ContractPort {
            connected: false,
            has_taproot_support: true, // Always true for BDF v2.5
            compiled_contracts: Vec::new(),
        }
    }
    
    pub fn connect(&mut self) -> Result<(), String> {
        // Placeholder for connection logic
        self.connected = true;
        Ok(())
    }
    
    pub fn disconnect(&mut self) {
        self.connected = false;
    }
    
    pub fn has_taproot_support(&self) -> bool {
        self.has_taproot_support
    }
    
    pub fn compile_miniscript(&mut self, name: &str, policy: &str, contract_type: ContractType) -> Result<MiniscriptPolicy, String> {
        // Placeholder for Miniscript compilation
        if !self.connected {
            return Err("Not connected".to_string());
        }
        
        // In a real implementation, this would compile the Miniscript policy
        let compiled = MiniscriptPolicy {
            expression: policy.to_string(),
            contract_type,
        };
        
        // Store the compiled contract
        self.compiled_contracts.push((name.to_string(), compiled.clone()));
        
        Ok(compiled)
    }
    
    pub fn execute_contract(&self, name: &str, args: &[Vec<u8>]) -> Result<ExecutionResult, String> {
        // Placeholder for contract execution
        if !self.connected {
            return Err("Not connected".to_string());
        }
        
        // Find the contract
        for (contract_name, policy) in &self.compiled_contracts {
            if contract_name == name {
                // In a real implementation, this would execute the contract

                // For Taproot contracts, we need special handling
                if policy.contract_type == ContractType::P2TR || policy.contract_type == ContractType::P2TR_Script {
                    // Special Taproot contract execution (BIP-341)
                    return Ok(ExecutionResult::Success);
                }
                
                // Generic contract execution
                return Ok(ExecutionResult::Success);
            }
        }
        
        Err(format!("Contract not found: {}", name))
    }
    
    pub fn create_taproot_script_tree(&self, _scripts: Vec<String>) -> Result<Vec<u8>, String> {
        // Placeholder for Taproot script tree creation (BIP-341)
        if !self.connected {
            return Err("Not connected".to_string());
        }
        
        if !self.has_taproot_support {
            return Err("Taproot not supported".to_string());
        }
        
        // In a real implementation, this would create a Taproot script tree
        Ok(vec![0; 32]) // Dummy script tree
    }
}

impl Port for ContractPort {
    fn name(&self) -> &'static str {
        "contracts"
    }
    
    fn version(&self) -> &'static str {
        "1.0.0"
    }
    
    fn is_connected(&self) -> bool {
        self.connected
    }
}