// tools/control.rs — Agent control tools
//
// Tools that affect agent control flow rather than performing work.
// These return Result<ToolOutput> to maintain consistency with other
// tools that can fail. The dispatch function handles error wrapping.

use anyhow::{Context, Result};

use super::ToolOutput;

fn pause(_args: &serde_json::Value) -> Result<ToolOutput> {
    Ok(ToolOutput {
        text: "Pausing autonomous behavior. Only user input will wake you.".to_string(),
        is_yield: true,
        images: Vec::new(),
        model_switch: None,
        dmn_pause: true,
    })
}

fn switch_model(args: &serde_json::Value) -> Result<ToolOutput> {
    let model = args
        .get("model")
        .and_then(|v| v.as_str())
        .context("'model' parameter is required")?;
    if model.is_empty() {
        anyhow::bail!("'model' parameter cannot be empty");
    }
    Ok(ToolOutput {
        text: format!("Switching to model '{}' after this turn.", model),
        is_yield: false,
        images: Vec::new(),
        model_switch: Some(model.to_string()),
        dmn_pause: false,
    })
}

fn yield_to_user(args: &serde_json::Value) -> Result<ToolOutput> {
    let msg = args
        .get("message")
        .and_then(|v| v.as_str())
        .unwrap_or("Waiting for input.");
    Ok(ToolOutput {
        text: format!("Yielding. {}", msg),
        is_yield: true,
        images: Vec::new(),
        model_switch: None,
        dmn_pause: false,
    })
}

pub(super) fn tools() -> [super::Tool; 3] {
    use super::Tool;
    [
        Tool { name: "switch_model",
               description: "Switch to a different LLM model mid-conversation. Memories and history carry over.",
               parameters_json: r#"{"type":"object","properties":{"model":{"type":"string","description":"Name of the model to switch to"}},"required":["model"]}"#,
               handler: |_a, v| Box::pin(async move {
                   let model = v.get("model").and_then(|v| v.as_str()).unwrap_or("");
                   Ok(format!("Switching to model: {}", model))
               }) },
        Tool { name: "pause",
               description: "Pause all autonomous behavior. Only the user can unpause (Ctrl+P or /wake).",
               parameters_json: r#"{"type":"object","properties":{}}"#,
               handler: |_a, _v| Box::pin(async { Ok("Pausing autonomous behavior. Only user input will wake you.".into()) }) },
        Tool { name: "yield_to_user",
               description: "Wait for user input before continuing. The only way to enter a waiting state.",
               parameters_json: r#"{"type":"object","properties":{"message":{"type":"string","description":"Optional status message"}}}"#,
               handler: |_a, v| Box::pin(async move {
                   let msg = v.get("message").and_then(|v| v.as_str()).unwrap_or("(yielding to user)");
                   Ok(msg.to_string())
               }) },
    ]
}