dstest 0.1.5

Deterministic Simulation Testing for containerised services
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use std::sync::Arc;

use mlua::{Lua, Result, Table};

use crate::config::AccumulationMode;
use crate::engine::context::BindingContext;
use crate::fault::FaultTree;
use crate::substrate::Substrate;

#[allow(clippy::await_holding_lock)]
pub fn register<S: Substrate>(lua: &Lua, dstest: &Table, ctx: &BindingContext<S>) -> Result<()> {
    let state = Arc::clone(&ctx.state);
    let config = Arc::clone(&ctx.config);
    let fault_tree = Arc::clone(&ctx.fault_tree);
    let substrate = Arc::clone(&ctx.substrate);
    let oracle = Arc::clone(&ctx.oracle);

    let run_steps_fn = lua.create_async_function(move |lua, n: usize| {
        let state = Arc::clone(&state);
        let config = Arc::clone(&config);
        let fault_tree = Arc::clone(&fault_tree);
        let substrate = Arc::clone(&substrate);
        let oracle = Arc::clone(&oracle);

        async move {
            let (require_seed, accumulation_mode, step_delay) = {
                let cfg = config.lock().expect("poisoned config lock");
                (cfg.require_seed, cfg.accumulation_mode, cfg.step_delay_ms)
            };

            if require_seed {
                let s = state.lock().expect("poisoned engine state lock");
                if s.seed.is_none() {
                    return Err(mlua::Error::RuntimeError(
                        "dstest.config({ seed = n }) must be called before dstest.run_steps()"
                            .into(),
                    ));
                }
            }

            let mut tree_guard = fault_tree.lock().expect("poisoned fault tree lock");

            if tree_guard.is_none() {
                let s = state.lock().expect("poisoned engine state lock");
                if let Some(seed) = s.seed {
                    let subject_ids: Vec<String> =
                        s.subjects.iter().map(|(id, _)| id.clone()).collect();
                    if subject_ids.is_empty() {
                        return Err(mlua::Error::RuntimeError(
                            "no subjects available for fault injection".into(),
                        ));
                    }
                    let cfg = config.lock().expect("poisoned config lock");
                    *tree_guard = Some(FaultTree::new(seed, subject_ids, &cfg));
                } else {
                    return Err(mlua::Error::RuntimeError(
                        "dstest.config({ seed = n }) must be called before dstest.run_steps()"
                            .into(),
                    ));
                }
            }

            let tree = tree_guard
                .as_mut()
                .ok_or_else(|| mlua::Error::RuntimeError("fault tree not initialized".into()))?;

            let mut results = Vec::new();
            for _ in 0..n {
                let Some(step_result) = tree.step() else {
                    break;
                };

                let subject = crate::substrate::Subject::new(step_result.subject_id.clone());

                match accumulation_mode {
                    AccumulationMode::Single => {
                        substrate
                            .clear_faults(&subject)
                            .map_err(mlua::Error::RuntimeError)?;
                        tokio::time::sleep(std::time::Duration::from_millis(step_delay)).await;
                    }
                    AccumulationMode::Accumulate => {}
                }

                substrate
                    .affect(&subject, &step_result.fault)
                    .map_err(mlua::Error::RuntimeError)?;

                let t = lua.create_table()?;
                t.set("fault", step_result.fault.to_string())?;
                t.set("subject", step_result.subject_id.clone())?;
                t.set("round", step_result.round)?;
                t.set("total_rounds", step_result.total_rounds)?;
                t.set("remaining", step_result.remaining)?;
                t.set("more", step_result.more)?;

                {
                    let mut o = oracle.lock().expect("poisoned oracle lock");
                    if o.enabled {
                        let report = o
                            .check_all(
                                &lua,
                                &step_result.subject_id,
                                &step_result.fault.to_string(),
                                step_result.round,
                            )
                            .await;
                        o.report.merge(&report);
                        t.set("oracle", {
                            let ot = lua.create_table()?;
                            ot.set("passed", report.passed)?;
                            ot.set("total_checks", report.total_checks)?;
                            ot.set("passed_checks", report.passed_checks)?;
                            ot.set("failed_checks", report.failed_checks)?;
                            ot
                        })?;
                    }
                }

                results.push(t);
            }

            let result_table = lua.create_table()?;
            for (i, t) in results.into_iter().enumerate() {
                result_table.set(i + 1, t)?;
            }

            Ok(result_table)
        }
    })?;

    dstest.set("run_steps", run_steps_fn)?;
    Ok(())
}