//! Tools for orchestrating multi-agent workflow runs.
//!
//! Flow: the LLM emits a `workflow_run` tool call with a JSON-encoded
//! `WorkflowScript` (Agent/Parallel/Pipeline/Phase primitives) which is
//! deserialized and handed to `app::workflow::engine::run_workflow` for
//! execution. Sibling agents spawned within the same run can share
//! ephemeral text via the `note_finding` tool, which forwards to
//! `app::workflow::engine::note_finding`.
//!
//! Why: decomposing a task into a workflow script lets the harness fan
//! out independent subtasks (parallel/pipeline/phased) instead of the
//! agent handling everything inline; simple tasks should skip this tool
//! entirely per its own description string.

use serde_json::{json, Value};
use anyhow::{Result, anyhow};
use super::Tool;
use super::ToolCtx;

/// Tool that parses and executes a JSON-encoded workflow script (Agent/Parallel/Pipeline/Phase).
pub struct WorkflowRun;

impl Tool for WorkflowRun {
    fn name(&self) -> &'static str {
        "workflow_run"
    }

    fn description(&self) -> &'static str {
        "Execute a workflow script that can spawn multiple subagents in parallel, pipeline, or phased stages. Use when a task benefits from decomposition into independent subtasks. Simple tasks should be handled inline without this tool."
    }

    fn parameters(&self) -> Value {
        json!({
            "type": "object",
            "properties": {
                "script": {
                    "type": "string",
                    "description": "JSON-encoded workflow script with name, description, script (Agent/Parallel/Pipeline/Phase primitives), and options (max_concurrency, continue_on_error)"
                },
                "args": {
                    "type": "object",
                    "description": "Optional string key-value arguments passed to the workflow script for template substitution ({{key}} placeholders)"
                }
            },
            "required": ["script"]
        })
    }

    /// Parse the `script`/`args` tool arguments and execute the workflow.
    ///
    /// Flow: extract `script` string → deserialize into `WorkflowScript` →
    /// collect optional `args` object into a `HashMap<String, String>` for
    /// `{{key}}` template substitution → delegate to
    /// `app::workflow::engine::run_workflow`.
    ///
    /// Why: template args are silently filtered to string values only
    /// (non-string values are dropped rather than erroring).
    ///
    /// Return: the workflow engine's output string, or an error if the
    /// script argument is missing or fails to parse as JSON.
    fn run(&self, _ctx: &ToolCtx, args: &Value) -> Result<String> {
        let script_str = args.get("script")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow!("missing required argument: script"))?;

        let workflow_script: crate::app::workflow::script::WorkflowScript =
            serde_json::from_str(script_str)
                .map_err(|e| anyhow!("failed to parse workflow script: {}", e))?;

        let workflow_args: std::collections::HashMap<String, String> = args.get("args")
            .and_then(|v| v.as_object())
            .map(|obj| {
                obj.iter().filter_map(|(k, v)| {
                    v.as_str().map(|s| (k.clone(), s.to_string()))
                }).collect()
            })
            .unwrap_or_default();

        crate::app::workflow::engine::run_workflow(
            &workflow_script, &workflow_args, &_ctx.session_dir, &_ctx.workspaces,
        )
    }
}

/// Tool that shares a text finding with sibling agents in the current workflow run.
pub struct NoteFinding;

impl Tool for NoteFinding {
    fn name(&self) -> &'static str {
        "note_finding"
    }

    fn description(&self) -> &'static str {
        "Share a finding with sibling agents in the same workflow_run. Findings are ephemeral to the current run and will be prepended to other agents' next tool-round context. Does not persist to memory."
    }

    fn parameters(&self) -> Value {
        json!({
            "type": "object",
            "properties": {
                "text": {
                    "type": "string",
                    "description": "The finding to share with sibling agents"
                }
            },
            "required": ["text"]
        })
    }

    /// Record `text` as a finding visible to sibling agents in the run.
    ///
    /// Flow: extract `text` argument → push into
    /// `ctx.workflow_findings` (the per-invocation Arc threaded through
    /// `execute_primitive`) → return a truncated confirmation echo.
    ///
    /// Why: findings are scoped per workflow invocation, not global,
    /// so concurrent workflow runs are isolated from each other.
    /// If no workflow findings Arc is set (called outside a workflow),
    /// the call is silently ignored.
    ///
    /// Return: confirmation string containing up to the first 80 chars
    /// of the recorded text.
    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
        let text = args.get("text")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow!("missing required argument: text"))?;

        if let Some(ref findings) = ctx.workflow_findings {
            if let Ok(mut f) = findings.lock() {
                f.push(text.to_string());
            }
        } else {
            tracing::debug!(
                "[note_finding] called outside a workflow run — discarding: {}",
                text.chars().take(80).collect::<String>(),
            );
        }
        Ok(format!("finding recorded: {}", text.chars().take(80).collect::<String>()))
    }
}