// 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;
mod edit;
mod glob;
mod grep;
mod memory;
mod read;
mod web;
mod write;

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

use serde::{Serialize, Deserialize};
use std::time::Instant;

fn default_timeout() -> u64 { 120 }

/// Function call within a tool call — name + JSON arguments.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FunctionCall {
    pub name: String,
    pub arguments: String,
}

/// Function definition for tool schema.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FunctionDef {
    pub name: String,
    pub description: String,
    pub parameters: serde_json::Value,
}

/// Partial function call within a streaming delta.
#[derive(Debug, Deserialize)]
pub struct FunctionCallDelta {
    pub name: Option<String>,
    pub arguments: Option<String>,
}

/// Tool definition sent to the model.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolDef {
    #[serde(rename = "type")]
    pub tool_type: String,
    pub function: FunctionDef,
}

impl ToolDef {
    pub fn new(name: &str, description: &str, parameters: serde_json::Value) -> Self {
        Self {
            tool_type: "function".to_string(),
            function: FunctionDef {
                name: name.to_string(),
                description: description.to_string(),
                parameters,
            },
        }
    }
}

/// A tool call requested by the model.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolCall {
    pub id: String,
    #[serde(rename = "type")]
    pub call_type: String,
    pub function: FunctionCall,
}

/// A partial tool call within a streaming delta. The first chunk for a
/// given tool call carries the id and function name; subsequent chunks
/// carry argument fragments.
#[derive(Debug, Deserialize)]
pub struct ToolCallDelta {
    pub index: usize,
    pub id: Option<String>,
    #[serde(rename = "type")]
    pub call_type: Option<String>,
    pub function: Option<FunctionCallDelta>,
}

/// Result of dispatching a tool call.
pub struct ToolOutput {
    pub text: String,
    pub is_yield: bool,
    /// Base64 data URIs for images to attach to the next message.
    pub images: Vec<String>,
    /// Model name to switch to (deferred to session level).
    pub model_switch: Option<String>,
    /// Agent requested DMN pause (deferred to session level).
    pub dmn_pause: bool,
}

impl ToolOutput {
    pub fn error(e: impl std::fmt::Display) -> Self {
        Self {
            text: format!("Error: {}", e),
            is_yield: false,
            images: Vec::new(),
            model_switch: None,
            dmn_pause: false,
        }
    }

    pub fn text(s: String) -> Self {
        Self {
            text: s,
            is_yield: false,
            images: Vec::new(),
            model_switch: None,
            dmn_pause: false,
        }
    }
}

/// A tool call in flight — metadata for TUI + JoinHandle for
/// result collection and cancellation.
pub struct ActiveToolCall {
    pub id: String,
    pub name: String,
    pub detail: String,
    pub started: Instant,
    pub background: bool,
    pub handle: tokio::task::JoinHandle<(ToolCall, ToolOutput)>,
}

/// 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.
///
/// Tries agent-specific tools first (control, vision), then
/// delegates to thought::dispatch for shared tools.
///
/// Note: working_stack is handled in runner.rs before reaching this
/// function (it needs mutable context access).
/// Dispatch a tool call by name. Handles all tools:
/// agent-specific (control, vision), memory/journal, file/bash.
pub async fn dispatch(
    name: &str,
    args: &serde_json::Value,
) -> ToolOutput {
    // Agent-specific tools
    let rich_result = match name {
        "pause" => Some(control::pause(args)),
        "switch_model" => Some(control::switch_model(args)),
        "yield_to_user" => Some(control::yield_to_user(args)),
        "view_image" => Some(vision::view_image(args)),
        _ => None,
    };
    if let Some(result) = rich_result {
        return result.unwrap_or_else(ToolOutput::error);
    }

    if let Some(output) = dispatch_shared(name, args, None).await {
        return output;
    }

    ToolOutput::error(format!("Unknown tool: {}", name))
}

/// Dispatch shared tools (memory, file, bash). Used by both the
/// interactive agent and subconscious agents. Provenance tracks
/// which agent made the call for memory attribution.
pub async fn dispatch_shared(
    name: &str,
    args: &serde_json::Value,
    provenance: Option<&str>,
) -> Option<ToolOutput> {
    // Memory and journal tools
    if name.starts_with("memory_") || name.starts_with("journal_") || name == "output" {
        let result = memory::dispatch(name, args, provenance);
        return Some(match result {
            Ok(s) => ToolOutput::text(s),
            Err(e) => ToolOutput::error(e),
        });
    }

    // File and execution tools
    let result = match name {
        "read_file" => read::read_file(args),
        "write_file" => write::write_file(args),
        "edit_file" => edit::edit_file(args),
        "bash" => bash::run_bash(args).await,
        "web_fetch" => web::web_fetch(args).await,
        "web_search" => web::web_search(args).await,
        "grep" => grep::grep(args),
        "glob" => glob::glob_search(args),
        _ => return None,
    };

    Some(match result {
        Ok(s) => ToolOutput::text(s),
        Err(e) => ToolOutput::error(e),
    })
}

/// Return all tool definitions (agent-specific + shared + memory).
pub fn definitions() -> Vec<ToolDef> {
    let mut defs = vec![
        vision::definition(),
        working_stack::definition(),
        read::definition(),
        write::definition(),
        edit::definition(),
        bash::definition(),
        web::fetch_definition(),
        web::search_definition(),
        grep::definition(),
        glob::definition(),
    ];
    defs.extend(control::definitions());
    defs.extend(memory::definitions());
    defs
}

/// Return memory + journal tool definitions only.
pub fn memory_and_journal_definitions() -> Vec<ToolDef> {
    let mut defs = memory::definitions();
    defs.extend(memory::journal_definitions());
    defs
}

/// 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(),
    }
}