scc-engine 0.2.7

//! Engine state: lessons, beads, evidence import, runtime.
//!
//! Value-returning operations; the CLI renders. Import bumps the evidence
//! epoch and recompiles the derived layer (moved with the code).

use std::io::Write;
use std::path::{Path, PathBuf};

// trace:exempt reason=internal-detail
pub fn lessons_add(root: &Path, text: &str) -> crate::Result<(String, PathBuf)> {
    let dir = crate::workspace::scc_dir(root);
    std::fs::create_dir_all(&dir)?;
    let path = dir.join("lessons.jsonl");
    let n = std::fs::read_to_string(&path)
        .map(|s| s.lines().filter(|l| !l.trim().is_empty()).count())
        .unwrap_or(0);
    let id = format!("lesson-{}", n + 1);
    let record = serde_json::json!({
        "id": id,
        "text": text,
        "created_at": scc_core::now_rfc3339(),
    });
    let mut f = std::fs::OpenOptions::new()
        .create(true)
        .append(true)
        .open(&path)
        .map_err(|e| crate::EngineError::Other(format!("lessons: {e}")))?;
    writeln!(f, "{record}").map_err(|e| crate::EngineError::Other(format!("lessons: {e}")))?;
    Ok((id, path))
}

// trace:exempt reason=internal-detail
pub fn lessons_list(root: &Path, limit: usize) -> crate::Result<Vec<(String, Vec<String>)>> {
    let store = crate::workspace::open_store(root)?;
    Ok(scc_indexer::adapters::hindsight::lessons(&store, limit))
}

// trace:exempt reason=internal-detail
pub fn beads(root: &Path, limit: usize) -> crate::Result<Vec<String>> {
    Ok(scc_indexer::adapters::beads::active_beads(root, limit))
}

// trace:exempt reason=internal-detail
pub fn import_evidence(root: &Path, format: &str, file: &str) -> crate::Result<scc_indexer::adapters::ImportReport> {
    let store = crate::workspace::open_store(root)?;
    let report = match format {
        "scip" => scc_indexer::adapters::import_scip(&store, std::path::Path::new(file)),
        "ccg" => scc_indexer::adapters::import_ccg(&store, std::path::Path::new(file)),
        "gitnexus" => scc_indexer::adapters::gitnexus::import_gitnexus(&store, std::path::Path::new(file))
            .map(|r| scc_indexer::adapters::ImportReport {
                symbols: r.symbols,
                calls: r.edges,
                imports: 0,
                errors: r.errors,
            }),
        "beads" => scc_indexer::adapters::beads::import_beads(&store, std::path::Path::new(file))
            .map(|r| scc_indexer::adapters::ImportReport {
                symbols: r.tasks,
                calls: r.dependencies,
                imports: r.active,
                errors: r.errors,
            }),
        "cbm" => scc_indexer::adapters::cbm::import_cbm(&store, std::path::Path::new(file))
            .map(|r| scc_indexer::adapters::ImportReport {
                symbols: r.symbols,
                calls: r.relationships,
                imports: 0,
                errors: r.errors,
            }),
        "hindsight" => scc_indexer::adapters::hindsight::import_hindsight(&store, std::path::Path::new(file))
            .map(|r| scc_indexer::adapters::ImportReport {
                symbols: r.lessons,
                calls: 0,
                imports: 0,
                errors: r.errors,
            }),
        "tracelayer" => scc_indexer::adapters::tracelayer::import_tracelayer(&store, std::path::Path::new(file))
            .map(|r| scc_indexer::adapters::ImportReport {
                symbols: r.requirements + r.implementations + r.tests + r.decisions,
                calls: r.relationships,
                imports: r.work_items,
                errors: r.errors,
            }),
        other => {
            return Err(crate::EngineError::Other(format!(
                "unknown import format '{other}' (use scip, ccg, gitnexus, beads, cbm, hindsight, or tracelayer)"
            )))
        }
    }
    .map_err(crate::EngineError::Other)?;
    store.bump_epoch(scc_store::ModelEpochKind::Evidence)?;
    crate::index::recompile(&store)?;
    Ok(report)
}

// trace:exempt reason=internal-detail
pub fn runtime_edges(root: &Path) -> crate::Result<Vec<scc_indexer::runtime::RuntimeEdge>> {
    let store = crate::workspace::open_store(root)?;
    scc_indexer::runtime::runtime_edges(&store).map_err(crate::EngineError::Other)
}

// trace:exempt reason=internal-detail
pub fn ingest_runtime(root: &Path, body: &str) -> crate::Result<()> {
    let store = crate::workspace::open_store(root)?;
    if body.contains("resourceSpans") {
        scc_indexer::runtime::ingest_otlp_json(&store, body)
            .map_err(crate::EngineError::Other)?;
        return Ok(());
    }
    scc_indexer::runtime::ingest_simple_edges(&store, body)
        .map_err(crate::EngineError::Other)?;
    Ok(())
}

// trace:exempt reason=internal-detail
pub fn reconcile(root: &Path) -> crate::Result<scc_indexer::runtime::Reconciliation> {
    let store = crate::workspace::open_store(root)?;
    scc_indexer::runtime::reconcile(&store).map_err(crate::EngineError::Other)
}

// trace:exempt reason=internal-detail
pub fn embeddings_build(root: &Path) -> crate::Result<serde_json::Value> {
    use scc_indexer::embed::EmbedConfig;
    let store = crate::workspace::open_store(root)?;
    let config = crate::workspace::load_config(root)?;
    if !config.inference.enabled {
        return Err(crate::EngineError::Other(
            "inference is disabled — set `inference.enabled: true` in .scc/config.yaml".into(),
        ));
    }
    let cfg = EmbedConfig::from_config(&config.inference);
    if cfg.is_remote() && !config.security.allow_remote_models {
        return Err(crate::EngineError::Other(
            "remote inference blocked: repository-derived content would leave the machine — set `security.allow_remote_models: true` to allow it (or use a loopback provider)".into(),
        ));
    }
    if store.snapshot_status()?.is_none() {
        return Err(crate::EngineError::Other("not indexed — run `scc index` first".into()));
    }
    let n = scc_indexer::embed::embed_repository(&store, &cfg).map_err(crate::EngineError::Other)?;
    store.cache_clear()?;
    Ok(serde_json::json!({"stored": n, "model": cfg.model}))
}

// trace:exempt reason=internal-detail
pub fn embeddings_get(store: &scc_store::Store, entity_id: &str) -> crate::Result<serde_json::Value> {
    match store.get_embedding(entity_id)? {
        Some((v, model)) => Ok(serde_json::json!({"id": entity_id, "model": model, "dims": v.len(), "vector": v})),
        None => Ok(serde_json::Value::Null),
    }
}

// trace:exempt reason=internal-detail
pub fn embeddings_status(store: &scc_store::Store) -> crate::Result<serde_json::Value> {
    let count = store.embedding_count()?;
    Ok(serde_json::json!({"embeddings": count}))
}

// trace:exempt reason=internal-detail
pub fn external_docs(root: &Path, dependency: &str) -> crate::Result<String> {
    let config = crate::workspace::load_config(root)?;
    if config.integrations.context7_command.is_empty() {
        return Err(crate::EngineError::Other(
            "Context7 is not configured — set integrations.context7_command in .scc/config.yaml".into(),
        ));
    }
    let mut client = scc_indexer::adapters::context7::start(&config.integrations.context7_command, root)
        .map_err(crate::EngineError::Other)?;
    client.docs_for(dependency).map_err(crate::EngineError::Other)
}

/// Namespaced plugin state (§23): get one key. Requires the calling
/// plugin's StateRead grant (checked by the host before dispatch; the
/// engine re-checks here so direct invoke() callers are gated too).
// trace:exempt reason=internal-detail
pub fn plugin_state_get(
    store: &scc_store::Store,
    plugin_id: &str,
    grants: &[scc_plugin_api::Permission],
    key: &str,
) -> crate::Result<serde_json::Value> {
    require_state_grant(plugin_id, grants, false)?;
    Ok(store.plugin_state_get(plugin_id, key)?.into())
}

/// Put one key (JSON text). Requires StateWrite.
// trace:exempt reason=internal-detail
pub fn plugin_state_put(
    store: &scc_store::Store,
    plugin_id: &str,
    grants: &[scc_plugin_api::Permission],
    key: &str,
    value: &str,
) -> crate::Result<serde_json::Value> {
    require_state_grant(plugin_id, grants, true)?;
    store.plugin_state_put(plugin_id, key, value)?;
    Ok(serde_json::json!({"ok": true}))
}

/// Delete one key. Requires StateWrite.
// trace:exempt reason=internal-detail
pub fn plugin_state_delete(
    store: &scc_store::Store,
    plugin_id: &str,
    grants: &[scc_plugin_api::Permission],
    key: &str,
) -> crate::Result<serde_json::Value> {
    require_state_grant(plugin_id, grants, true)?;
    store.plugin_state_delete(plugin_id, key)?;
    Ok(serde_json::json!({"ok": true}))
}

/// Scan keys by prefix (ordered, bounded). Requires StateRead.
// trace:exempt reason=internal-detail
pub fn plugin_state_scan(
    store: &scc_store::Store,
    plugin_id: &str,
    grants: &[scc_plugin_api::Permission],
    prefix: &str,
    limit: usize,
) -> crate::Result<serde_json::Value> {
    require_state_grant(plugin_id, grants, false)?;
    let rows = store.plugin_state_scan(plugin_id, prefix, limit)?;
    Ok(serde_json::json!({
        "keys": rows.iter().map(|(k, v)| serde_json::json!({"key": k, "value": v})).collect::<Vec<_>>(),
    }))
}

// trace:exempt reason=internal-detail
fn require_state_grant(
    plugin_id: &str,
    grants: &[scc_plugin_api::Permission],
    write: bool,
) -> crate::Result<()> {
    let need = if write {
        scc_plugin_api::Permission::StateWrite
    } else {
        scc_plugin_api::Permission::StateRead
    };
    if grants.contains(&need) {
        Ok(())
    } else {
        Err(crate::EngineError::Other(format!(
            "permission denied: plugin {plugin_id} lacks {}",
            need.as_str()
        )))
    }
}