blockchain-runtime 0.1.0

//! Main blockchain runtime trait and implementations

use anyhow::Result;
use async_trait::async_trait;
use std::path::Path;

use crate::config::RuntimeConfig;
use crate::security::SecurityConfig;
use crate::types::{
    RuntimeEnvironment, ExecutionInputs, ExecutionResult, RuntimeCapabilities,
    RuntimeMetricDefinition, RuntimeEvent, SecurityViolation
};

/// Main blockchain runtime trait
#[async_trait]
pub trait BlockchainRuntime: Send + Sync {
    /// Get the blockchain identifier
    fn blockchain_id(&self) -> &str;

    /// Create a runtime environment
    async fn create_environment(&self, config: RuntimeConfig) -> Result<RuntimeEnvironment>;

    /// Execute code in the runtime
    async fn execute(
        &self,
        env: &RuntimeEnvironment,
        code_path: &Path,
        inputs: &ExecutionInputs,
    ) -> Result<ExecutionResult>;

    /// Deploy a contract to the runtime
    async fn deploy_contract(
        &self,
        env: &RuntimeEnvironment,
        bytecode: &[u8],
        constructor_args: &[u8],
    ) -> Result<String>;

    /// Call a contract function
    async fn call_function(
        &self,
        env: &RuntimeEnvironment,
        contract_address: &str,
        function: &str,
        args: &[u8],
    ) -> Result<Vec<u8>>;

    /// Get runtime metrics
    fn metrics_definition(&self) -> Vec<RuntimeMetricDefinition>;

    /// Monitor runtime events
    async fn monitor(
        &self,
        env: &RuntimeEnvironment,
        execution_id: &str,
    ) -> Result<Vec<RuntimeEvent>>;

    /// Destroy the environment
    async fn destroy(&self, env: RuntimeEnvironment) -> Result<()>;

    /// Check if runtime is available
    async fn is_available(&self) -> bool;

    /// Get runtime capabilities
    fn capabilities(&self) -> RuntimeCapabilities;

    /// Execute code with security checks
    async fn execute_secure(
        &self,
        env: &RuntimeEnvironment,
        code_path: &Path,
        inputs: &ExecutionInputs,
        security_config: &SecurityConfig,
    ) -> Result<ExecutionResult>;

    /// Check for reentrancy attacks
    async fn check_reentrancy(
        &self,
        env: &RuntimeEnvironment,
        function_name: &str,
        caller: &str,
        call_stack: &[String],
    ) -> Result<bool>;

    /// Detect integer overflow
    async fn detect_overflow(
        &self,
        env: &RuntimeEnvironment,
        operation: &str,
        operands: &[i64],
    ) -> Result<bool>;

    /// Verify access control
    async fn verify_access_control(
        &self,
        env: &RuntimeEnvironment,
        function_name: &str,
        caller: &str,
        required_role: Option<&str>,
    ) -> Result<bool>;

    /// Enforce resource limits
    async fn enforce_resource_limits(
        &self,
        env: &RuntimeEnvironment,
        gas_used: u64,
        memory_used: u64,
        call_depth: u32,
        external_calls: u32,
        security_config: &SecurityConfig,
    ) -> Result<Vec<SecurityViolation>>;

    /// Get security report for execution
    async fn get_security_report(
        &self,
        env: &RuntimeEnvironment,
        execution_id: &str,
    ) -> Result<std::collections::HashMap<String, serde_json::Value>>;
}

/// Default implementation of blockchain runtime
pub struct DefaultBlockchainRuntime {
    blockchain_id: String,
    capabilities: RuntimeCapabilities,
}

impl DefaultBlockchainRuntime {
    /// Create a new default blockchain runtime
    pub fn new(blockchain_id: String) -> Self {
        Self {
            blockchain_id,
            capabilities: RuntimeCapabilities::default(),
        }
    }

    /// Create a new runtime with custom capabilities
    pub fn with_capabilities(blockchain_id: String, capabilities: RuntimeCapabilities) -> Self {
        Self {
            blockchain_id,
            capabilities,
        }
    }
}

#[async_trait]
impl BlockchainRuntime for DefaultBlockchainRuntime {
    fn blockchain_id(&self) -> &str {
        &self.blockchain_id
    }

    async fn create_environment(&self, config: RuntimeConfig) -> Result<RuntimeEnvironment> {
        // In a real implementation, this would create the actual runtime environment
        Ok(RuntimeEnvironment {
            environment_id: format!("env_{}", std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_millis()),
            blockchain_id: self.blockchain_id.clone(),
            runtime_type: crate::types::RuntimeType::LocalProcess,
            endpoint_url: "http://localhost:8545".to_string(),
            state: crate::types::EnvironmentState::Ready,
            metadata: std::collections::HashMap::new(),
        })
    }

    async fn execute(
        &self,
        _env: &RuntimeEnvironment,
        _code_path: &Path,
        _inputs: &ExecutionInputs,
    ) -> Result<ExecutionResult> {
        // In a real implementation, this would execute the code
        Ok(ExecutionResult::new("exec_123".to_string(), true))
    }

    async fn deploy_contract(
        &self,
        _env: &RuntimeEnvironment,
        _bytecode: &[u8],
        _constructor_args: &[u8],
    ) -> Result<String> {
        // In a real implementation, this would deploy the contract
        Ok("0x1234567890abcdef".to_string())
    }

    async fn call_function(
        &self,
        _env: &RuntimeEnvironment,
        _contract_address: &str,
        _function: &str,
        _args: &[u8],
    ) -> Result<Vec<u8>> {
        // In a real implementation, this would call the function
        Ok(vec![0x01, 0x02, 0x03])
    }

    fn metrics_definition(&self) -> Vec<RuntimeMetricDefinition> {
        vec![
            RuntimeMetricDefinition {
                name: "gas_used".to_string(),
                description: "Gas consumed during execution".to_string(),
                unit: "gas".to_string(),
                metric_type: crate::types::MetricType::Gas,
            },
            RuntimeMetricDefinition {
                name: "execution_time".to_string(),
                description: "Time taken to execute".to_string(),
                unit: "ms".to_string(),
                metric_type: crate::types::MetricType::Time,
            },
        ]
    }

    async fn monitor(
        &self,
        _env: &RuntimeEnvironment,
        _execution_id: &str,
    ) -> Result<Vec<RuntimeEvent>> {
        // In a real implementation, this would monitor events
        Ok(vec![])
    }

    async fn destroy(&self, _env: RuntimeEnvironment) -> Result<()> {
        // In a real implementation, this would destroy the environment
        Ok(())
    }

    async fn is_available(&self) -> bool {
        // In a real implementation, this would check if the runtime is available
        true
    }

    fn capabilities(&self) -> RuntimeCapabilities {
        self.capabilities.clone()
    }

    async fn execute_secure(
        &self,
        env: &RuntimeEnvironment,
        code_path: &Path,
        inputs: &ExecutionInputs,
        _security_config: &SecurityConfig,
    ) -> Result<ExecutionResult> {
        // In a real implementation, this would execute with security checks
        let mut result = self.execute(env, code_path, inputs).await?;
        
        // Add security context
        result.security_context = crate::types::SecureExecutionContext::default();
        
        Ok(result)
    }

    async fn check_reentrancy(
        &self,
        _env: &RuntimeEnvironment,
        _function_name: &str,
        _caller: &str,
        _call_stack: &[String],
    ) -> Result<bool> {
        // In a real implementation, this would check for reentrancy
        Ok(false)
    }

    async fn detect_overflow(
        &self,
        _env: &RuntimeEnvironment,
        _operation: &str,
        _operands: &[i64],
    ) -> Result<bool> {
        // In a real implementation, this would detect overflow
        Ok(false)
    }

    async fn verify_access_control(
        &self,
        _env: &RuntimeEnvironment,
        _function_name: &str,
        _caller: &str,
        _required_role: Option<&str>,
    ) -> Result<bool> {
        // In a real implementation, this would verify access control
        Ok(true)
    }

    async fn enforce_resource_limits(
        &self,
        _env: &RuntimeEnvironment,
        _gas_used: u64,
        _memory_used: u64,
        _call_depth: u32,
        _external_calls: u32,
        _security_config: &SecurityConfig,
    ) -> Result<Vec<SecurityViolation>> {
        // In a real implementation, this would enforce resource limits
        Ok(vec![])
    }

    async fn get_security_report(
        &self,
        _env: &RuntimeEnvironment,
        _execution_id: &str,
    ) -> Result<std::collections::HashMap<String, serde_json::Value>> {
        // In a real implementation, this would generate a security report
        Ok(std::collections::HashMap::new())
    }
}