use schemars::JsonSchema;
use serde_json::json;

pub fn success(id: serde_json::Value, result: serde_json::Value) -> serde_json::Value {
    json!({
        "jsonrpc": "2.0",
        "id": id,
        "result": result
    })
}

pub fn error(id: serde_json::Value, code: i32, message: &str) -> serde_json::Value {
    json!({
        "jsonrpc": "2.0",
        "id": id,
        "error": {
            "code": code,
            "message": message
        }
    })
}

pub fn tool_def<T: JsonSchema>(name: &str, description: &str) -> serde_json::Value {
    let schema = schemars::schema_for!(T);
    let schema_val = serde_json::to_value(&schema).unwrap();
    // MCP expects standard JSON schema. Schemars returns draft-07.
    json!({
        "name": name,
        "description": description,
        "inputSchema": schema_val
    })
}