topodb-cli 0.0.1

mod cli;
mod output;

use std::str::FromStr;

use clap::Parser;
use cli::{Cli, Command};
use topodb::{Db, Direction, EdgeId, NodeId, Op, PropValue, Scope, TopoError, TraversalQuery};

fn main() {
    let cli = Cli::parse();

    // Resolve the default scope once, up front: "shared" (case-insensitive)
    // -> Scope::Shared, a ULID -> Scope::Id, anything else is a caller error
    // the user can fix -> rejected/2.
    let default_scope = match topodb_json::resolve_scope(Some(&cli.scope), Scope::Shared) {
        Ok(s) => s,
        Err(e) => output::fail("rejected", &e, 2),
    };

    // Open using the file's own persisted index spec — no --spec flag on
    // this CLI. An EXISTING file always inherits its persisted spec exactly
    // (via `open_stored`), so a db another tool (e.g. topodb-mcp) already
    // populated is never reindexed or mis-declared. A brand-new file (no
    // `.redb` at this path yet) is created with the SAME canonical
    // `topodb_json::default_spec()` that topodb-mcp uses when `--spec` is
    // omitted — equality on `(Entity, name)`, text on `(Memory, content)` —
    // rather than the engine's bare `IndexSpec::default()` (which declares
    // nothing). This is what makes a CLI-created db and an MCP-created db
    // byte-identical in their persisted `index_spec`: serving one via the
    // other never reindexes, and both `find` and `search` work out of the box
    // on a fresh CLI db. `Path::exists` is safe here: the CLI is a single,
    // non-concurrent process per invocation, so there's no writer racing it.
    let db = if cli.db.exists() {
        Db::open_stored(&cli.db)
    } else {
        Db::open_with(&cli.db, topodb_json::default_spec())
    };
    let db = match db {
        Ok(db) => db,
        Err(e) => output::fail_engine(&e),
    };

    match cli.cmd {
        Command::Info => info(&db, &cli.db, default_scope, cli.pretty),
        Command::CreateMemory { content, props } => {
            create_memory(&db, default_scope, content, props.as_deref(), cli.pretty)
        }
        Command::CreateEntity { name, props } => {
            create_entity(&db, default_scope, name, props.as_deref(), cli.pretty)
        }
        Command::Link {
            from,
            to,
            ty,
            props,
            valid_from,
        } => link(
            &db,
            default_scope,
            &from,
            &to,
            ty,
            props.as_deref(),
            valid_from,
            cli.pretty,
        ),
        Command::Get { id } => get(&db, default_scope, &id, cli.pretty),
        Command::Find { label, prop, value } => {
            find(&db, default_scope, &label, &prop, &value, cli.pretty)
        }
        Command::Search { query, k } => search(&db, default_scope, &query, k, cli.pretty),
        Command::Traverse {
            seed,
            max_hops,
            direction,
            edge_type,
        } => traverse(
            &db,
            default_scope,
            &seed,
            max_hops,
            direction.into(),
            edge_type,
            cli.pretty,
        ),
        Command::Stats { id } => stats(&db, default_scope, &id, cli.pretty),
        Command::Changes { since } => changes(&db, since, cli.pretty),
        Command::Compact { keep_from } => compact(&db, keep_from, cli.pretty),
    }
}

/// Parses a `--value` arg per the CLI's find semantics: try it as a JSON
/// scalar first (so `42` -> `Int(42)`, `true` -> `Bool(true)`,
/// `"ada"` -> `Str("ada")`); if it doesn't parse as JSON at all, fall back to
/// treating the raw string as `PropValue::Str` (so `--value ada` and
/// `--value '"ada"'` are equivalent). A JSON value that parses but isn't a
/// scalar `json_to_prop_value` can represent (array/object/null) is a
/// caller-fixable input error -> `fail("rejected", .., 2)`.
fn parse_value_arg(value: &str) -> PropValue {
    match serde_json::from_str::<serde_json::Value>(value) {
        Ok(v) => match topodb_json::json_to_prop_value(&v) {
            Ok(pv) => pv,
            Err(e) => output::fail("rejected", &format!("parsing --value: {e}"), 2),
        },
        Err(_) => PropValue::Str(value.to_string()),
    }
}

fn get(db: &Db, scope: Scope, id: &str, pretty: bool) -> ! {
    let id = match NodeId::from_str(id) {
        Ok(id) => id,
        Err(e) => output::fail("rejected", &format!("invalid id {id:?}: {e}"), 2),
    };
    let scopes = topodb_json::scope_to_scope_set(scope);
    let value = match db.node(&scopes, id) {
        Some(n) => {
            let node = match topodb_json::node_to_json(&n) {
                Ok(v) => v,
                Err(e) => output::fail("internal", &e, 1),
            };
            serde_json::json!({ "found": true, "node": node })
        }
        None => serde_json::json!({ "found": false }),
    };
    output::ok(&value, pretty);
}

fn find(db: &Db, scope: Scope, label: &str, prop: &str, value: &str, pretty: bool) -> ! {
    let pv = parse_value_arg(value);
    let scopes = topodb_json::scope_to_scope_set(scope);
    let hits = match db.nodes_by_prop(&scopes, label, prop, &pv) {
        Ok(hits) => hits,
        Err(e) => output::fail_engine(&e),
    };
    let nodes: Vec<serde_json::Value> = match hits.iter().map(topodb_json::node_to_json).collect() {
        Ok(nodes) => nodes,
        Err(e) => output::fail("internal", &e, 1),
    };
    output::ok(&serde_json::Value::Array(nodes), pretty);
}

fn search(db: &Db, scope: Scope, query: &str, k: usize, pretty: bool) -> ! {
    let scopes = topodb_json::scope_to_scope_set(scope);
    let hits = match db.search_text(&scopes, query, k) {
        Ok(hits) => hits,
        Err(e) => output::fail_engine(&e),
    };
    let out: Result<Vec<serde_json::Value>, String> = hits
        .iter()
        .map(|(n, score)| {
            topodb_json::node_to_json(n)
                .map(|node| serde_json::json!({ "node": node, "score": score }))
        })
        .collect();
    let out = match out {
        Ok(out) => out,
        Err(e) => output::fail("internal", &e, 1),
    };
    output::ok(&serde_json::Value::Array(out), pretty);
}

#[allow(clippy::too_many_arguments)]
fn traverse(
    db: &Db,
    scope: Scope,
    seed: &str,
    max_hops: u8,
    direction: Direction,
    edge_type: Vec<String>,
    pretty: bool,
) -> ! {
    let seed = match NodeId::from_str(seed) {
        Ok(id) => id,
        Err(e) => output::fail("rejected", &format!("invalid seed id {seed:?}: {e}"), 2),
    };
    let scopes = topodb_json::scope_to_scope_set(scope);
    // Empty --edge-type (none given) -> None, follow every edge type; the
    // engine treats `Some(vec![])` as "match nothing", which would silently
    // strand the traversal at the seed — so an empty CLI list must map to
    // `None`, not `Some(vec![])`.
    let edge_types = if edge_type.is_empty() {
        None
    } else {
        Some(edge_type.into_iter().map(Into::into).collect())
    };
    let query = TraversalQuery {
        scopes,
        seeds: vec![seed],
        max_hops,
        edge_types,
        direction,
        as_of: None,
    };
    let sg = match db.traverse(&query) {
        Ok(sg) => sg,
        Err(e) => output::fail_engine(&e),
    };
    let subgraph = match topodb_json::subgraph_to_json(&sg) {
        Ok(v) => v,
        Err(e) => output::fail("internal", &e, 1),
    };
    output::ok(&serde_json::json!({ "subgraph": subgraph }), pretty);
}

fn stats(db: &Db, scope: Scope, id: &str, pretty: bool) -> ! {
    let id = match NodeId::from_str(id) {
        Ok(id) => id,
        Err(e) => output::fail("rejected", &format!("invalid id {id:?}: {e}"), 2),
    };
    let scopes = topodb_json::scope_to_scope_set(scope);
    let value = match db.access_stats(&scopes, id) {
        Ok(Some(s)) => serde_json::json!({
            "found": true,
            "access_stats": {
                "access_count": s.access_count,
                "last_accessed_at": s.last_accessed_at,
            }
        }),
        Ok(None) => serde_json::json!({ "found": false }),
        Err(e) => output::fail_engine(&e),
    };
    output::ok(&value, pretty);
}

fn changes(db: &Db, since: u64, pretty: bool) -> ! {
    let events = match db.ops_since(since) {
        Ok(events) => events,
        // `Compacted` (the requested range is below the retained floor) is a
        // caller-fixable condition — the caller re-anchors from current
        // state — so it routes to rejected/exit-2, not fail_engine's
        // internal/exit-1 default for non-Rejected variants. Every other
        // error (Storage, Closed, ...) is a genuine internal failure.
        Err(e @ TopoError::Compacted { .. }) => output::fail("rejected", &e.to_string(), 2),
        Err(e) => output::fail_engine(&e),
    };
    let out: Vec<serde_json::Value> = events
        .into_iter()
        .map(|ev| serde_json::json!({ "seq": ev.seq, "op": serde_json::to_value(&*ev.op).unwrap_or(serde_json::Value::Null) }))
        .collect();
    output::ok(&serde_json::Value::Array(out), pretty);
}

fn compact(db: &Db, keep_from: u64, pretty: bool) -> ! {
    if let Err(e) = db.compact_ops(keep_from) {
        output::fail_engine(&e);
    }
    output::ok(&serde_json::json!({ "oldest": keep_from }), pretty);
}

fn info(db: &Db, path: &std::path::Path, default_scope: Scope, pretty: bool) -> ! {
    let current_seq = match db.current_seq() {
        Ok(seq) => seq,
        Err(e) => output::fail_engine(&e),
    };
    let value = serde_json::json!({
        "path": path.to_string_lossy(),
        "format_version": db.format_version(),
        "current_seq": current_seq,
        "index_spec": db.index_spec(),
        "default_scope": topodb_json::scope_to_json(default_scope),
    });
    output::ok(&value, pretty);
}

/// Parses an optional `--props` JSON-object-string arg into a `Value`, for
/// handing to `merge_required_prop`/`json_to_props`. A malformed JSON string
/// is a caller-fixable input error -> `fail("rejected", .., 2)`, matching the
/// exit-code contract for bad input (never a panic).
fn parse_props_arg(props: Option<&str>) -> Option<serde_json::Value> {
    props.map(|s| match serde_json::from_str(s) {
        Ok(v) => v,
        Err(e) => output::fail("rejected", &format!("parsing --props as JSON: {e}"), 2),
    })
}

fn create_memory(db: &Db, scope: Scope, content: String, props: Option<&str>, pretty: bool) -> ! {
    let extra = parse_props_arg(props);
    let props = match topodb_json::merge_required_prop(
        topodb_json::MEMORY_CONTENT_PROP,
        PropValue::Str(content),
        extra.as_ref(),
    ) {
        Ok(p) => p,
        Err(e) => output::fail("rejected", &e, 2),
    };
    let id = NodeId::new();
    let op = Op::CreateNode {
        id,
        scope,
        label: topodb_json::MEMORY_LABEL.into(),
        props,
    };
    if let Err(e) = db.submit(vec![op]) {
        output::fail_engine(&e);
    }
    output::ok(&serde_json::json!({ "id": id.to_string() }), pretty);
}

fn create_entity(db: &Db, scope: Scope, name: String, props: Option<&str>, pretty: bool) -> ! {
    let extra = parse_props_arg(props);
    let props = match topodb_json::merge_required_prop(
        topodb_json::ENTITY_NAME_PROP,
        PropValue::Str(name),
        extra.as_ref(),
    ) {
        Ok(p) => p,
        Err(e) => output::fail("rejected", &e, 2),
    };
    let id = NodeId::new();
    let op = Op::CreateNode {
        id,
        scope,
        label: topodb_json::ENTITY_LABEL.into(),
        props,
    };
    if let Err(e) = db.submit(vec![op]) {
        output::fail_engine(&e);
    }
    output::ok(&serde_json::json!({ "id": id.to_string() }), pretty);
}

#[allow(clippy::too_many_arguments)]
fn link(
    db: &Db,
    scope: Scope,
    from: &str,
    to: &str,
    ty: String,
    props: Option<&str>,
    valid_from: Option<i64>,
    pretty: bool,
) -> ! {
    let from = match NodeId::from_str(from) {
        Ok(id) => id,
        Err(e) => output::fail("rejected", &format!("invalid --from id {from:?}: {e}"), 2),
    };
    let to = match NodeId::from_str(to) {
        Ok(id) => id,
        Err(e) => output::fail("rejected", &format!("invalid --to id {to:?}: {e}"), 2),
    };
    let props = match parse_props_arg(props) {
        Some(v) => match topodb_json::json_to_props(&v) {
            Ok(p) => p,
            Err(e) => output::fail("rejected", &e, 2),
        },
        None => topodb::Props::new(),
    };
    let id = EdgeId::new();
    let op = Op::CreateEdge {
        id,
        scope,
        ty: ty.into(),
        from,
        to,
        props,
        valid_from,
    };
    if let Err(e) = db.submit(vec![op]) {
        output::fail_engine(&e);
    }
    output::ok(&serde_json::json!({ "id": id.to_string() }), pretty);
}