/// MCP Adapter implementation
pub struct McpAdapter;

#[async_trait]
impl ProtocolAdapter for McpAdapter {
    type Request = JsonRpcRequest;
    type Response = JsonRpcResponse;

    fn decode(&self, raw: &[u8]) -> Result<UnifiedRequest, ProtocolError> {
        let json_rpc: JsonRpcRequest = serde_json::from_slice(raw)?;

        // Map JSON-RPC method to Operation
        let method = json_rpc.method.clone();
        let params = json_rpc.params.clone();
        let operation = match method.as_str() {
            "analyze_complexity" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::AnalyzeComplexity(p)
            }
            "analyze_satd" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::AnalyzeSatd(p)
            }
            "analyze_dead_code" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::AnalyzeDeadCode(p)
            }
            "generate_context" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::GenerateContext(p)
            }
            "quality_gate" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::QualityGate(p)
            }
            "quality_proxy" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::QualityProxy(p)
            }
            "refactor_start" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::RefactorStart(p)
            }
            "refactor_next" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::RefactorNext(p)
            }
            "refactor_stop" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::RefactorStop(p)
            }
            "scaffold_project" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::ScaffoldProject(p)
            }
            "scaffold_agent" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::ScaffoldAgent(p)
            }
            "pdmt_todos" => {
                let p = serde_json::from_value(params.clone())?;
                Operation::PdmtTodos(p)
            }
            _ => return Err(ProtocolError::UnknownMethod(method)),
        };

        Ok(UnifiedRequest {
            operation,
            params,
            context: RequestContext::from_json_rpc(&json_rpc),
        })
    }

    fn encode(&self, response: UnifiedResponse) -> Result<Vec<u8>, ProtocolError> {
        let json_rpc = JsonRpcResponse {
            jsonrpc: "2.0".to_string(),
            result: response.result,
            error: response.error.map(Into::into),
            id: response.metadata.request_id.into(),
        };

        Ok(serde_json::to_vec(&json_rpc)?)
    }

    async fn handle(&self, request: Self::Request) -> Self::Response {
        // This would be implemented to process the request
        // For now, return a placeholder response
        JsonRpcResponse {
            jsonrpc: "2.0".to_string(),
            result: Some(serde_json::json!({"status": "ok"})),
            error: None,
            id: request.id,
        }
    }
}
