// tools/mod.rs — Agent-specific tool dispatch
//
// Shared tools (memory, files, bash, journal) live in thought/.
// This module handles agent-specific tools (control, vision,
// working_stack) and delegates everything else to thought::dispatch.

// Core tools
mod bash;
pub mod channels;
mod edit;
mod glob;
mod grep;
pub mod memory;
mod read;
mod web;
mod write;

// Agent-specific tools
mod control;
mod vision;

use std::future::Future;
use std::pin::Pin;
use std::time::Instant;

fn default_timeout() -> u64 { 120 }

/// Async tool handler function.
/// Agent is None when called from contexts without an agent (MCP server, subconscious).
pub type ToolHandler = fn(
    Option<std::sync::Arc<super::Agent>>,
    serde_json::Value,
) -> Pin<Box<dyn Future<Output = anyhow::Result<String>> + Send>>;

/// A tool with its definition and handler — single source of truth.
/// Strings are static — the tool list JSON can be built without
/// serialization by interpolating these directly.
#[derive(Clone, Copy)]
pub struct Tool {
    pub name: &'static str,
    pub description: &'static str,
    pub parameters_json: &'static str,
    pub handler: ToolHandler,
}

impl Tool {
    /// Build the JSON for this tool's definition (for the API tools array).
    pub fn to_json(&self) -> String {
        format!(
            r#"{{"type":"function","function":{{"name":"{}","description":"{}","parameters":{}}}}}"#,
            self.name,
            self.description.replace('"', r#"\""#),
            self.parameters_json,
        )
    }
}

pub struct ActiveToolCall {
    pub id: String,
    pub name: String,
    pub detail: String,
    pub started: Instant,
    pub background: bool,
    pub handle: tokio::task::JoinHandle<(super::context::PendingToolCall, String)>,
}

pub struct ActiveTools(Vec<ActiveToolCall>);

impl ActiveTools {
    pub fn new() -> Self { Self(Vec::new()) }

    pub fn push(&mut self, call: ActiveToolCall) {
        self.0.push(call);
    }

    pub fn remove(&mut self, id: &str) {
        self.0.retain(|t| t.id != id);
    }

    pub fn take_finished(&mut self) -> Vec<ActiveToolCall> {
        let mut finished = Vec::new();
        let mut i = 0;
        while i < self.0.len() {
            if self.0[i].handle.is_finished() {
                finished.push(self.0.remove(i));
            } else {
                i += 1;
            }
        }
        finished
    }

    pub fn take_foreground(&mut self) -> Vec<ActiveToolCall> {
        let mut fg = Vec::new();
        let mut i = 0;
        while i < self.0.len() {
            if !self.0[i].background {
                fg.push(self.0.remove(i));
            } else {
                i += 1;
            }
        }
        fg
    }

    pub fn iter(&self) -> impl Iterator<Item = &ActiveToolCall> {
        self.0.iter()
    }

    pub fn abort_all(&mut self) {
        for entry in self.0.drain(..) {
            entry.handle.abort();
        }
    }

    pub fn len(&self) -> usize { self.0.len() }
    pub fn is_empty(&self) -> bool { self.0.is_empty() }
}

/// Truncate output if it exceeds max length, appending a truncation notice.
pub fn truncate_output(mut s: String, max: usize) -> String {
    if s.len() > max {
        s.truncate(max);
        s.push_str("\n... (output truncated)");
    }
    s
}

/// Dispatch a tool call by name through the registry.
/// Dispatch a tool call by name. Returns the result text,
/// or an error string prefixed with "Error: ".
pub async fn dispatch(
    name: &str,
    args: &serde_json::Value,
) -> String {
    dispatch_with_agent(name, args, None).await
}

/// Dispatch a tool call with optional agent context.
/// If agent is provided, uses the agent's tool list.
pub async fn dispatch_with_agent(
    name: &str,
    args: &serde_json::Value,
    agent: Option<std::sync::Arc<super::Agent>>,
) -> String {
    let tool = if let Some(ref a) = agent {
        // Only dispatch tools the agent is allowed to use
        let guard = a.state.lock().await;
        guard.tools.iter().find(|t| t.name == name).copied()
    } else {
        // No agent context — allow all tools (CLI/MCP path)
        tools().into_iter().find(|t| t.name == name)
    };
    match tool {
        Some(t) => (t.handler)(agent, args.clone()).await
            .unwrap_or_else(|e| format!("Error: {}", e)),
        None => format!("Error: Unknown tool: {}", name),
    }
}

/// Return all registered tools with definitions + handlers.
pub fn tools() -> Vec<Tool> {
    let mut all = vec![
        read::tool(), write::tool(), edit::tool(),
        grep::tool(), glob::tool(), bash::tool(),
        vision::tool(),
    ];
    all.extend(web::tools());
    all.extend(memory::memory_tools());
    all.extend(memory::journal_tools());
    all.extend(channels::tools());
    all.extend(control::tools());
    all
}

/// Memory + journal tools only — for subconscious agents.
pub fn memory_and_journal_tools() -> Vec<Tool> {
    let mut all = memory::memory_tools().to_vec();
    all.extend(memory::journal_tools());
    all
}

/// Create a short summary of tool args for the tools pane header.
pub fn summarize_args(tool_name: &str, args: &serde_json::Value) -> String {
    match tool_name {
        "read_file" | "write_file" | "edit_file" => args["file_path"]
            .as_str()
            .unwrap_or("")
            .to_string(),
        "bash" => {
            let cmd = args["command"].as_str().unwrap_or("");
            if cmd.len() > 60 {
                let end = cmd.char_indices()
                    .map(|(i, _)| i)
                    .take_while(|&i| i <= 60)
                    .last()
                    .unwrap_or(0);
                format!("{}...", &cmd[..end])
            } else {
                cmd.to_string()
            }
        }
        "grep" => {
            let pattern = args["pattern"].as_str().unwrap_or("");
            let path = args["path"].as_str().unwrap_or(".");
            format!("{} in {}", pattern, path)
        }
        "glob" => args["pattern"]
            .as_str()
            .unwrap_or("")
            .to_string(),
        "view_image" => {
            if let Some(pane) = args["pane_id"].as_str() {
                format!("pane {}", pane)
            } else {
                args["file_path"].as_str().unwrap_or("").to_string()
            }
        }
        "journal" => {
            let entry = args["entry"].as_str().unwrap_or("");
            if entry.len() > 60 {
                format!("{}...", &entry[..60])
            } else {
                entry.to_string()
            }
        }
        "yield_to_user" => args["message"]
            .as_str()
            .unwrap_or("")
            .to_string(),
        "switch_model" => args["model"]
            .as_str()
            .unwrap_or("")
            .to_string(),
        "pause" => String::new(),
        _ => String::new(),
    }
}