codetether-agent 4.0.0

//! Batch Tool - Execute multiple tool calls in parallel.

use super::{Tool, ToolRegistry, ToolResult};
use anyhow::{Context, Result};
use async_trait::async_trait;
use serde::Deserialize;
use serde_json::{Value, json};
use std::sync::{Arc, RwLock, Weak};

/// BatchTool executes multiple tool calls in parallel.
/// Uses lazy registry initialization to break circular dependency.
pub struct BatchTool {
    registry: Arc<RwLock<Option<Weak<ToolRegistry>>>>,
}

impl BatchTool {
    pub fn new() -> Self {
        Self {
            registry: Arc::new(RwLock::new(None)),
        }
    }

    /// Set the registry after construction to break circular dependency.
    pub fn set_registry(&self, registry: Weak<ToolRegistry>) {
        let mut guard = self.registry.write().unwrap();
        *guard = Some(registry);
    }
}

#[derive(Deserialize)]
struct Params {
    calls: Vec<BatchCall>,
}

#[derive(Deserialize)]
struct BatchCall {
    tool: String,
    args: Value,
}

#[async_trait]
impl Tool for BatchTool {
    fn id(&self) -> &str {
        "batch"
    }
    fn name(&self) -> &str {
        "Batch Execute"
    }
    fn description(&self) -> &str {
        "Execute multiple tool calls in parallel. Each call specifies a tool name and arguments."
    }
    fn parameters(&self) -> Value {
        json!({
            "type": "object",
            "properties": {
                "calls": {
                    "type": "array",
                    "description": "Array of tool calls to execute",
                    "items": {
                        "type": "object",
                        "properties": {
                            "tool": {"type": "string", "description": "Tool ID to call"},
                            "args": {"type": "object", "description": "Arguments for the tool"}
                        },
                        "required": ["tool", "args"]
                    }
                }
            },
            "required": ["calls"]
        })
    }

    async fn execute(&self, params: Value) -> Result<ToolResult> {
        let p: Params = serde_json::from_value(params).context("Invalid params")?;

        if p.calls.is_empty() {
            return Ok(ToolResult::error("No calls provided"));
        }

        // Get registry from weak reference
        let registry = {
            let guard = self.registry.read().unwrap();
            match guard.as_ref() {
                Some(weak) => match weak.upgrade() {
                    Some(arc) => arc,
                    None => return Ok(ToolResult::error("Registry no longer available")),
                },
                None => return Ok(ToolResult::error("Registry not initialized")),
            }
        };

        // Execute all calls in parallel
        let futures: Vec<_> = p
            .calls
            .iter()
            .enumerate()
            .map(|(i, call)| {
                let tool_id = call.tool.clone();
                let args = call.args.clone();
                let registry = Arc::clone(&registry);

                async move {
                    // Prevent recursive batch calls
                    if tool_id == "batch" {
                        return (
                            i,
                            tool_id,
                            ToolResult::error("Cannot call batch from within batch"),
                        );
                    }

                    match registry.get(&tool_id) {
                        Some(tool) => match tool.execute(args).await {
                            Ok(result) => (i, tool_id, result),
                            Err(e) => (i, tool_id, ToolResult::error(format!("Error: {}", e))),
                        },
                        None => {
                            // Use the invalid tool handler for better error messages
                            let available_tools =
                                registry.list().iter().map(|s| s.to_string()).collect();
                            let invalid_tool = super::invalid::InvalidTool::with_context(
                                tool_id.clone(),
                                available_tools,
                            );
                            let invalid_args = serde_json::json!({
                                "requested_tool": tool_id,
                                "args": args
                            });
                            match invalid_tool.execute(invalid_args).await {
                                Ok(result) => (i, tool_id.clone(), result),
                                Err(e) => (
                                    i,
                                    tool_id.clone(),
                                    ToolResult::error(format!(
                                        "Unknown tool: {}. Error: {}",
                                        tool_id, e
                                    )),
                                ),
                            }
                        }
                    }
                }
            })
            .collect();

        let results = futures::future::join_all(futures).await;

        let mut output_parts = Vec::new();
        let mut success_count = 0;
        let mut error_count = 0;

        for (idx, tool_id, result) in results {
            if result.success {
                success_count += 1;
                output_parts.push(format!("[{}] ✓ {}:\n{}", idx + 1, tool_id, result.output));
            } else {
                error_count += 1;
                output_parts.push(format!("[{}] ✗ {}:\n{}", idx + 1, tool_id, result.output));
            }
        }

        let summary = format!(
            "Batch complete: {} succeeded, {} failed\n\n{}",
            success_count,
            error_count,
            output_parts.join("\n\n")
        );

        let overall_success = error_count == 0;
        if overall_success {
            Ok(ToolResult::success(summary).with_metadata("success_count", json!(success_count)))
        } else {
            Ok(ToolResult::error(summary).with_metadata("error_count", json!(error_count)))
        }
    }
}