rig-ecs 0.45.0

//! An agent's model: the catalog model it chose, the reasoning setting it
//! sends, and how the choice is connected. The catalog and how its models
//! are reached are rig-core's [`Connector`].

use std::fmt;
use std::sync::Arc;

use bevy_ecs::prelude::*;
use bevy_reflect::prelude::*;
use rig_core::catalog::{Connector, ModelSpec};
use rig_core::completion::Reasoning;
use serde::{Deserialize, Serialize};

use super::agent::{ActiveTurn, Agent, Notice};
use super::effects::Handler;
use super::session_log::ReflectSaved;

/// The models agents can use and how each is reached: rig's built-in
/// catalog by default. A plugin adds a sign-in with
/// [`Connector::add_sign_in`], or replaces the catalog. After a change, the
/// next frame connects the agents whose chosen model was not usable before.
/// The [`Connector`] is `Send` and `Sync` except on browser wasm, where its
/// providers may hold JavaScript values, and Bevy asks for both on every
/// target.
#[derive(Resource, Clone, Default)]
pub struct Models(pub Connector);

// SAFETY: browser wasm without the `atomics` target feature runs one
// thread, so `Models` is never sent to or shared with another one.
#[cfg(all(
    target_arch = "wasm32",
    target_os = "unknown",
    not(target_feature = "atomics")
))]
unsafe impl Send for Models {}
// SAFETY: as for `Send`: there is no other thread.
#[cfg(all(
    target_arch = "wasm32",
    target_os = "unknown",
    not(target_feature = "atomics")
))]
unsafe impl Sync for Models {}

impl Models {
    /// A connection to the catalog model `reference` (`vendor/model`), such
    /// as for a turn or a call a plugin sends to another model than its
    /// agent's; or why it cannot be used.
    pub fn connect(&self, reference: &str) -> Result<Connection, String> {
        match self.0.connect(reference) {
            Ok((spec, handler)) => Ok(Connection {
                spec,
                handler: Handler(handler),
            }),
            Err(why) => Err(format!("Cannot use {reference}: {why}.")),
        }
    }
}

/// The chosen catalog model, as `vendor/model`. It never changes in place:
/// choosing another model inserts a new one, which rebuilds the agent's
/// [`Connection`]. Saved with the session as a string under rig-memory's
/// `MODEL` (its type path, `rig::model`), which a library program reads.
#[derive(Component, Reflect, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[component(immutable)]
#[reflect(Component, Saved, Clone)]
#[type_path = "rig"]
#[type_name = "model"]
#[serde(transparent)]
pub struct ModelChoice(pub String);

impl ModelChoice {
    /// The model and reasoning setting of an agent spawned by an agent with
    /// `parent`'s: `model`, a reference to a catalog model that calls tools,
    /// when given, else the parent's; the reasoning setting named `effort`
    /// when given, else the parent's with the parent's model.
    pub fn inherit(
        models: &Connector,
        parent: (Option<&ModelChoice>, ReasoningSetting),
        model: Option<&str>,
        effort: Option<&str>,
    ) -> Result<(Option<ModelChoice>, ReasoningSetting), String> {
        fn asked(text: Option<&str>) -> Option<&str> {
            text.map(str::trim).filter(|text| !text.is_empty())
        }
        let resolve = |text: &str| models.catalog().resolve(text).map(|found| found.spec);
        let model = match asked(model) {
            Some(asked) => {
                let spec = resolve(asked).map_err(|why| format!("{why}; use vendor/model"))?;
                if !spec.tools {
                    return Err(format!("{asked} cannot call tools"));
                }
                Some(ModelChoice(spec.reference()))
            }
            None => parent.0.cloned(),
        };
        let effort = match (asked(effort), &model) {
            (Some(name), Some(model)) => {
                let spec = resolve(&model.0).map_err(|why| why.to_string())?;
                let named = spec.reasoning.named(name);
                ReasoningSetting(
                    named
                        .map_err(|why| format!("{}: {why}", spec.display_name))?
                        .reasoning,
                )
            }
            _ if model.is_some() && model.as_ref() == parent.0 => parent.1,
            _ => ReasoningSetting::default(),
        };
        Ok((model, effort))
    }
}

/// The connected model of an agent with a [`ModelChoice`]: its catalog
/// entry and the effect handler every model call is dispatched to. Built
/// from the environment once per choice, and not saved: restoring the
/// choice rebuilds it.
#[derive(Component, Reflect, Clone)]
#[reflect(opaque, Component, Clone)]
pub struct Connection {
    /// The model's catalog entry.
    pub spec: Arc<ModelSpec>,
    /// The model as an effect handler.
    pub handler: Handler,
}

/// The reasoning setting sent with each request, or `None` for the
/// provider's default. It never changes in place. Saved with the session.
#[derive(
    Component, Reflect, Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize,
)]
#[component(immutable)]
#[reflect(opaque, Component, Saved, Default, Clone, Serialize, Deserialize)]
pub struct ReasoningSetting(pub Option<Reasoning>);

/// `default`, `off`, the level's word, or `1024 tokens`.
impl fmt::Display for ReasoningSetting {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self.0 {
            None => f.write_str("default"),
            Some(Reasoning::Off) => f.write_str("off"),
            Some(Reasoning::Effort(level)) => f.write_str(level.as_str()),
            Some(Reasoning::Budget { tokens }) => write!(f, "{tokens} tokens"),
            Some(_) => f.write_str("custom"),
        }
    }
}

/// Choose the agent's model by catalog reference (`vendor/model`).
#[derive(EntityEvent, Reflect, Clone, Debug)]
#[reflect(Event, Clone, Debug)]
pub struct SetModel {
    /// The agent.
    pub entity: Entity,
    /// The catalog reference.
    pub model: String,
}

/// Choose the agent's reasoning setting; `None` is the provider default.
#[derive(EntityEvent, Reflect, Clone, Debug)]
#[reflect(Event, Clone, Debug)]
pub struct SetReasoning {
    /// The agent.
    pub entity: Entity,
    /// The setting.
    pub effort: ReasoningSetting,
}

/// Chooses the agent's model: a known catalog model replaces the agent's
/// [`ModelChoice`], which [`connect`] connects; an unknown one keeps it,
/// with an error notice naming the closest models and the one kept.
pub(crate) fn on_set_model(
    set: On<SetModel>,
    agents: Query<(Has<ActiveTurn>, Option<&ModelChoice>), With<Agent>>,
    models: Res<Models>,
    mut commands: Commands,
    mut notices: MessageWriter<Notice>,
) {
    let Ok((busy, current)) = agents.get(set.entity) else {
        return;
    };
    if busy {
        notices.write(Notice::turn_running(set.entity));
        return;
    }
    match models.0.catalog().resolve(&set.model) {
        Ok(found) => {
            commands
                .entity(set.entity)
                .insert(ModelChoice(found.spec.reference()));
        }
        Err(why) => {
            let stop = if why.suggestions.is_empty() { "." } else { "" };
            let kept = match current {
                Some(ModelChoice(model)) => format!(" Still on {model}."),
                None => String::new(),
            };
            let text = format!("Not picked: {why}{stop}{kept}");
            notices.write(Notice::error(set.entity, text));
        }
    }
}

/// Connects an agent whose [`ModelChoice`] was inserted, by [`SetModel`],
/// by restoring a session or by a plugin, unless it is connected to that
/// model already: each choice is connected, or refused, once, so requests
/// never re-resolve the provider. Only a change of a connected agent's
/// model is announced: spawning and restoring an agent are silent, since
/// views show its model anyway.
pub(crate) fn connect(
    inserted: On<Insert<ModelChoice>>,
    agents: Query<(&ModelChoice, Option<&Connection>)>,
    models: Res<Models>,
    mut commands: Commands,
    mut notices: MessageWriter<Notice>,
) {
    let agent = inserted.entity;
    let Ok((choice, connected)) = agents.get(agent) else {
        return;
    };
    if connected.is_some_and(|connection| connection.spec.reference() == choice.0) {
        return;
    }
    match models.connect(&choice.0) {
        Ok(connection) => {
            if connected.is_some() {
                let model = format!("Model: {} ({}).", connection.spec.display_name, choice.0);
                notices.write(Notice::info(agent, model));
            }
            commands.entity(agent).insert(connection);
        }
        Err(why) => {
            commands.entity(agent).remove::<Connection>();
            notices.write(Notice::error(agent, why));
        }
    }
}

/// Connects each agent whose [`ModelChoice`] is not connected once the
/// [`Models`] changed, such as a model a plugin found or added to the
/// catalog after the choice was restored, quietly as [`connect`] does for a
/// restored choice. A choice still not usable is left as it is: its
/// refusal was shown when it was made.
pub(crate) fn reconnect(
    agents: Query<(Entity, &ModelChoice), (With<Agent>, Without<Connection>)>,
    models: Res<Models>,
    mut commands: Commands,
) {
    for (agent, choice) in &agents {
        if let Ok(connection) = models.connect(&choice.0) {
            commands.entity(agent).try_insert(connection);
        }
    }
}

/// Resets a reasoning setting the agent's model does not take, whichever
/// of the two was inserted last.
pub(crate) fn check_effort(
    inserted: On<Insert<(Connection, ReasoningSetting)>>,
    agents: Query<(&Connection, &ReasoningSetting)>,
    mut commands: Commands,
    mut notices: MessageWriter<Notice>,
) {
    let agent = inserted.entity;
    let Ok((Connection { spec, .. }, effort)) = agents.get(agent) else {
        return;
    };
    if let Err(refusal) = spec.validate(&spec.default_options(effort.0)) {
        commands.entity(agent).insert(ReasoningSetting(None));
        notices.write(Notice::info(
            agent,
            format!("Reasoning reset to default: {refusal}."),
        ));
    }
}

/// Sets the agent's reasoning setting after checking it against the model.
pub(crate) fn on_set_reasoning(
    set: On<SetReasoning>,
    agents: Query<(Option<&Connection>, Has<ActiveTurn>), With<Agent>>,
    mut commands: Commands,
    mut notices: MessageWriter<Notice>,
) {
    let Ok((connection, busy)) = agents.get(set.entity) else {
        return;
    };
    if busy {
        notices.write(Notice::turn_running(set.entity));
        return;
    }
    let Some(connection) = connection else {
        notices.write(Notice::no_model(set.entity));
        return;
    };
    let spec = &connection.spec;
    match spec.validate(&spec.default_options(set.effort.0)) {
        Ok(()) => {
            commands.entity(set.entity).insert(set.effort);
            notices.write(Notice::info(
                set.entity,
                format!("Reasoning: {}.", set.effort),
            ));
        }
        Err(refusal) => {
            notices.write(Notice::error(set.entity, format!("{refusal}.")));
        }
    }
}