convergio-types 0.1.6

//! The Extension trait — the only way to exist in Convergio.
//!
//! Every module (core or plugin) implements this trait.
//! No alternative, no workaround. If you don't implement Extension, you don't exist.

use crate::events::{DomainEvent, EventFilter};
use crate::manifest::Manifest;

/// Result type used across all extensions.
pub type ExtResult<T> = Result<T, Box<dyn std::error::Error + Send + Sync>>;

/// A database migration owned by a module.
pub struct Migration {
    /// Monotonically increasing version number for this module.
    pub version: u32,
    /// Human-readable description.
    pub description: &'static str,
    /// SQL to apply (forward only for now).
    pub up: &'static str,
}

/// Health status reported by each extension.
#[derive(Debug, Clone, serde::Serialize)]
pub enum Health {
    Ok,
    Degraded { reason: String },
    Down { reason: String },
}

/// A named metric emitted by an extension.
#[derive(Debug, Clone, serde::Serialize)]
pub struct Metric {
    pub name: String,
    pub value: f64,
    pub labels: Vec<(String, String)>,
}

/// A scheduled task declared by an extension.
pub struct ScheduledTask {
    pub name: &'static str,
    /// Cron expression (e.g. "0 2 * * *" for 2 AM daily).
    pub cron: &'static str,
}

/// An MCP tool definition declared by an extension.
///
/// The MCP server discovers these at runtime via `/api/meta/mcp-tools`.
/// When an extension adds routes, it also declares the corresponding
/// MCP tools here — no manual registry maintenance needed.
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct McpToolDef {
    pub name: String,
    pub description: String,
    /// HTTP method: "GET", "POST", "PUT", "DELETE"
    pub method: String,
    /// URL path with `:param` placeholders (e.g. "/api/plan-db/json/:plan_id")
    pub path: String,
    /// JSON Schema for the tool's input parameters.
    pub input_schema: serde_json::Value,
    /// Minimum ring required: "sandboxed", "community", "trusted", "core"
    pub min_ring: String,
    /// Path parameter names to interpolate from input args.
    #[serde(default)]
    pub path_params: Vec<String>,
}

/// The one trait to rule them all.
///
/// Implement this to register your module with the Convergio daemon.
/// The daemon calls these methods at startup and runtime.
pub trait Extension: Send + Sync {
    /// Identity and capabilities — who you are, what you do.
    fn manifest(&self) -> Manifest;

    /// Your database tables. The migration runner applies these at startup,
    /// tracked in `_schema_registry`.
    fn migrations(&self) -> Vec<Migration> {
        vec![]
    }

    /// Your HTTP routes. The server mounts these under the appropriate prefix.
    fn routes(&self, ctx: &AppContext) -> Option<axum::Router> {
        let _ = ctx;
        None
    }

    /// Called once after migrations and before routes are served.
    fn on_start(&self, ctx: &AppContext) -> ExtResult<()> {
        let _ = ctx;
        Ok(())
    }

    /// Called on graceful shutdown.
    fn on_shutdown(&self) -> ExtResult<()> {
        Ok(())
    }

    /// Health check — aggregated into `/health/deep`.
    fn health(&self) -> Health {
        Health::Ok
    }

    /// Metrics — collected by the telemetry system.
    fn metrics(&self) -> Vec<Metric> {
        vec![]
    }

    /// Domain events this extension subscribes to.
    fn subscriptions(&self) -> Vec<EventFilter> {
        vec![]
    }

    /// Called when a subscribed domain event fires.
    fn on_event(&self, event: &DomainEvent) {
        let _ = event;
    }

    /// Periodic tasks (cron-like).
    fn scheduled_tasks(&self) -> Vec<ScheduledTask> {
        vec![]
    }

    /// Called when a scheduled task fires (cron match).
    fn on_scheduled_task(&self, task_name: &str) {
        let _ = task_name;
    }

    /// Called when configuration changes at runtime.
    fn on_config_change(&self, key: &str, value: &serde_json::Value) -> ExtResult<()> {
        let _ = (key, value);
        Ok(())
    }

    /// MCP tool definitions exposed by this extension.
    ///
    /// The daemon aggregates these into `/api/meta/mcp-tools` and the MCP
    /// server discovers them at startup. Add entries here whenever you add
    /// HTTP routes that agents or Jarvis should be able to call.
    fn mcp_tools(&self) -> Vec<McpToolDef> {
        vec![]
    }
}

/// Shared application context passed to extensions.
///
/// Type-erased resource map: the server fills it with concrete types
/// (ConnPool, config, health registry, …) and extensions retrieve
/// them by type via `get::<T>()`.
#[derive(Default)]
pub struct AppContext {
    resources: std::collections::HashMap<
        std::any::TypeId,
        std::sync::Arc<dyn std::any::Any + Send + Sync>,
    >,
}

impl AppContext {
    pub fn new() -> Self {
        Self::default()
    }

    /// Insert a resource. Overwrites any previous value of the same type.
    pub fn insert<T: 'static + Send + Sync>(&mut self, val: T) {
        self.resources
            .insert(std::any::TypeId::of::<T>(), std::sync::Arc::new(val));
    }

    /// Retrieve a shared reference to a resource by type.
    pub fn get<T: 'static + Send + Sync>(&self) -> Option<&T> {
        self.resources
            .get(&std::any::TypeId::of::<T>())
            .and_then(|v| v.downcast_ref())
    }

    /// Retrieve an `Arc<T>` clone for a resource.
    pub fn get_arc<T: 'static + Send + Sync>(&self) -> Option<std::sync::Arc<T>> {
        self.resources
            .get(&std::any::TypeId::of::<T>())
            .and_then(|v| v.clone().downcast().ok())
    }
}