huskies: merge 607_story_extract_bot_command_service

server/src/service/bot_command/mod.rs

@@ -0,0 +1,97 @@
+//! Bot command service — domain logic for dispatching slash commands.
+//!
+//! Extracted from `http/bot_command.rs` so that argument parsing and dispatch
+//! are independently testable without an HTTP layer.
+//!
+//! Conventions: `docs/architecture/service-modules.md`
+//!
+//! # Structure
+//! - `mod.rs` (this file) — public API and typed `Error` type
+//! - `parse.rs` — pure argument parsing, no I/O
+//! - `io.rs` — all side-effectful calls (transport handlers, stores, agent pool)
+
+pub(super) mod io;
+pub mod parse;
+
+use crate::agents::AgentPool;
+use std::path::Path;
+use std::sync::Arc;
+
+// ── Error type ────────────────────────────────────────────────────────────────
+
+/// Typed errors returned by `service::bot_command::execute`.
+///
+/// HTTP handlers map these to specific status codes:
+/// - [`Error::UnknownCommand`] → 404 Not Found
+/// - [`Error::BadArgs`] → 400 Bad Request
+/// - [`Error::CommandFailed`] → 500 Internal Server Error
+#[derive(Debug)]
+#[allow(dead_code)] // CommandFailed is part of the public API contract; not yet reachable
+pub enum Error {
+    /// The command keyword does not match any registered command.
+    UnknownCommand(String),
+    /// The command exists but the provided arguments are invalid.
+    BadArgs(String),
+    /// The command ran but failed with an internal error.
+    CommandFailed(String),
+}
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::UnknownCommand(msg) | Self::BadArgs(msg) | Self::CommandFailed(msg) => {
+                write!(f, "{msg}")
+            }
+        }
+    }
+}
+
+// ── Public API ────────────────────────────────────────────────────────────────
+
+/// Execute a bot command and return the markdown response.
+///
+/// Dispatches to the same handlers used by the Matrix and Slack bots. The
+/// `cmd` argument is the lower-cased command keyword (e.g. `"status"`,
+/// `"start"`). The `args` argument is any text after the keyword, already
+/// trimmed.
+///
+/// # Errors
+/// - [`Error::UnknownCommand`] if the command keyword is not registered.
+/// - [`Error::BadArgs`] if the arguments fail validation.
+/// - [`Error::CommandFailed`] if command execution raises an internal error.
+pub async fn execute(
+    cmd: &str,
+    args: &str,
+    project_root: &Path,
+    agents: &Arc<AgentPool>,
+) -> Result<String, Error> {
+    match cmd {
+        "assign" => {
+            let parsed = parse::parse_assign(args).map_err(Error::BadArgs)?;
+            Ok(io::call_assign(&parsed, project_root, agents).await)
+        }
+        "start" => {
+            let parsed = parse::parse_start(args).map_err(Error::BadArgs)?;
+            Ok(io::call_start(&parsed, project_root, agents).await)
+        }
+        "delete" => {
+            let number = parse::parse_number("delete", args).map_err(Error::BadArgs)?;
+            Ok(io::call_delete(&number, project_root, agents).await)
+        }
+        "rmtree" => {
+            let number = parse::parse_number("rmtree", args).map_err(Error::BadArgs)?;
+            Ok(io::call_rmtree(&number, project_root, agents).await)
+        }
+        "rebuild" => Ok(io::call_rebuild(project_root, agents).await),
+        "timer" => io::call_timer(args, project_root)
+            .await
+            .map_err(Error::BadArgs),
+        "htop" => Ok(io::call_htop(args, agents)),
+        _ => match io::call_sync(cmd, args, project_root, agents) {
+            Some(response) => Ok(response),
+            None => Err(Error::UnknownCommand(format!(
+                "Unknown command: `/{cmd}`. Type `/help` to see available commands."
+            ))),
+        },
+    }
+}