use tinyjson::JsonValue;
use stepflow::Session;
use crate::StepFlowParseError;
use crate::json::{jsonval_get_obj, jsonval_obj_get_obj};

/// Parses a Flow into a [`Session`](stepflow::Session)
///
/// if `allow_implicit_var` is `true`, when a [`Step`](stepflow::step::Step) is parsed and uses a variable that has
/// not been declared in the `vars` section, a [`StringVar`](stepflow::data::StringVar) will be created.
pub fn parse_session_json(session: &mut Session, json: &str, allow_implicit_var: bool) ->
    Result<(), StepFlowParseError> 
{
  let parsed: JsonValue = json.parse()?;
  let session_json = jsonval_get_obj(&parsed, "root")?;

  if session_json.contains_key("vars") {
    let vars_json = jsonval_obj_get_obj(&session_json, "vars")?;
    crate::data::parse_vars_json(session, vars_json)?;
  }

  let steps_json = jsonval_obj_get_obj(&session_json, "steps")?;
  crate::step::parse_steps_json(session, steps_json, allow_implicit_var)?;

  let actions_json = jsonval_obj_get_obj(&session_json, "actions")?;
  crate::action::parse_actions_json(session, actions_json)?;

  Ok(())
}