use crate::shared::models::UserSession;
use crate::shared::state::AppState;
use diesel::prelude::*;
use log::{error, info, trace, warn};
use rhai::{Dynamic, Engine};
use std::path::Path;
use std::sync::Arc;
use uuid::Uuid;
pub fn use_tool_keyword(state: Arc<AppState>, user: UserSession, engine: &mut Engine) {
    let state_clone = Arc::clone(&state);
    let user_clone = user.clone();

    engine
        .register_custom_syntax(["USE", "TOOL", "$expr$"], false, move |context, inputs| {
            let tool_path = context.eval_expression_tree(&inputs[0])?;
            let tool_path_str = tool_path.to_string().trim_matches('"').to_string();
            trace!(
                "USE TOOL command executed: {} for session: {}",
                tool_path_str,
                user_clone.id
            );
            let tool_name = tool_path_str
                .strip_prefix(".gbdialog/")
                .unwrap_or(&tool_path_str)
                .strip_suffix(".bas")
                .unwrap_or(&tool_path_str)
                .to_string();
            if tool_name.is_empty() {
                return Err(Box::new(rhai::EvalAltResult::ErrorRuntime(
                    "Invalid tool name".into(),
                    rhai::Position::NONE,
                )));
            }
            let state_for_task = Arc::clone(&state_clone);
            let user_for_task = user_clone.clone();
            let tool_name_for_task = tool_name;
            let (tx, rx) = std::sync::mpsc::channel();
            std::thread::spawn(move || {
                let rt = tokio::runtime::Builder::new_multi_thread()
                    .worker_threads(2)
                    .enable_all()
                    .build();
                let send_err = if let Ok(_rt) = rt {
                    let result = associate_tool_with_session(
                        &state_for_task,
                        &user_for_task,
                        &tool_name_for_task,
                    );
                    tx.send(result).err()
                } else {
                    tx.send(Err("Failed to build tokio runtime".to_string()))
                        .err()
                };
                if send_err.is_some() {
                    error!("Failed to send result from thread");
                }
            });
            match rx.recv_timeout(std::time::Duration::from_secs(10)) {
                Ok(Ok(message)) => Ok(Dynamic::from(message)),
                Ok(Err(e)) => Err(Box::new(rhai::EvalAltResult::ErrorRuntime(
                    e.into(),
                    rhai::Position::NONE,
                ))),
                Err(std::sync::mpsc::RecvTimeoutError::Timeout) => {
                    Err(Box::new(rhai::EvalAltResult::ErrorRuntime(
                        "USE TOOL timed out".into(),
                        rhai::Position::NONE,
                    )))
                }
                Err(e) => Err(Box::new(rhai::EvalAltResult::ErrorRuntime(
                    format!("USE TOOL failed: {}", e).into(),
                    rhai::Position::NONE,
                ))),
            }
        })
        .expect("valid syntax registration");

    // Register use_tool(tool_name) function for preprocessor compatibility
    let state_clone2 = Arc::clone(&state);
    let user_clone2 = user.clone();

    engine.register_fn("use_tool", move |tool_path: &str| -> Dynamic {
        let tool_path_str = tool_path.to_string();
        trace!(
            "use_tool function called: {} for session: {}",
            tool_path_str,
            user_clone2.id
        );
        let tool_name = tool_path_str
            .strip_prefix(".gbdialog/")
            .unwrap_or(&tool_path_str)
            .strip_suffix(".bas")
            .unwrap_or(&tool_path_str)
            .to_string();
        if tool_name.is_empty() {
            return Dynamic::from("ERROR: Invalid tool name");
        }
        let state_for_task = Arc::clone(&state_clone2);
        let user_for_task = user_clone2.clone();
        let tool_name_for_task = tool_name;
        let (tx, rx) = std::sync::mpsc::channel();
        std::thread::spawn(move || {
            let rt = tokio::runtime::Builder::new_multi_thread()
                .worker_threads(2)
                .enable_all()
                .build();
            let send_err = if let Ok(_rt) = rt {
                let result = associate_tool_with_session(
                    &state_for_task,
                    &user_for_task,
                    &tool_name_for_task,
                );
                tx.send(result).err()
            } else {
                tx.send(Err("Failed to build tokio runtime".to_string()))
                    .err()
            };
            if send_err.is_some() {
                error!("Failed to send result from thread");
            }
        });
        match rx.recv_timeout(std::time::Duration::from_secs(10)) {
            Ok(Ok(message)) => Dynamic::from(message),
            Ok(Err(e)) => Dynamic::from(format!("ERROR: {}", e)),
            Err(std::sync::mpsc::RecvTimeoutError::Timeout) => {
                Dynamic::from("ERROR: use_tool timed out")
            }
            Err(e) => Dynamic::from(format!("ERROR: use_tool failed: {}", e)),
        }
    });

    // Register USE_TOOL(tool_name) function (uppercase variant)
    let state_clone3 = Arc::clone(&state);
    let user_clone3 = user;

    engine.register_fn("USE_TOOL", move |tool_path: &str| -> Dynamic {
        let tool_path_str = tool_path.to_string();
        trace!(
            "USE_TOOL function called: {} for session: {}",
            tool_path_str,
            user_clone3.id
        );
        let tool_name = tool_path_str
            .strip_prefix(".gbdialog/")
            .unwrap_or(&tool_path_str)
            .strip_suffix(".bas")
            .unwrap_or(&tool_path_str)
            .to_string();
        if tool_name.is_empty() {
            return Dynamic::from("ERROR: Invalid tool name");
        }
        let state_for_task = Arc::clone(&state_clone3);
        let user_for_task = user_clone3.clone();
        let tool_name_for_task = tool_name;
        let (tx, rx) = std::sync::mpsc::channel();
        std::thread::spawn(move || {
            let rt = tokio::runtime::Builder::new_multi_thread()
                .worker_threads(2)
                .enable_all()
                .build();
            let send_err = if let Ok(_rt) = rt {
                let result = associate_tool_with_session(
                    &state_for_task,
                    &user_for_task,
                    &tool_name_for_task,
                );
                tx.send(result).err()
            } else {
                tx.send(Err("Failed to build tokio runtime".to_string()))
                    .err()
            };
            if send_err.is_some() {
                error!("Failed to send result from thread");
            }
        });
        match rx.recv_timeout(std::time::Duration::from_secs(10)) {
            Ok(Ok(message)) => Dynamic::from(message),
            Ok(Err(e)) => Dynamic::from(format!("ERROR: {}", e)),
            Err(std::sync::mpsc::RecvTimeoutError::Timeout) => {
                Dynamic::from("ERROR: USE_TOOL timed out")
            }
            Err(e) => Dynamic::from(format!("ERROR: USE_TOOL failed: {}", e)),
        }
    });
}
fn associate_tool_with_session(
    state: &AppState,
    user: &UserSession,
    tool_name: &str,
) -> Result<String, String> {
    use crate::shared::models::schema::session_tool_associations;

    // Check if tool's .mcp.json file exists in work directory
    let home_dir = std::env::var("HOME").unwrap_or_else(|_| ".".to_string());
    let gb_dir = format!("{}/gb", home_dir);

    // Get bot name to construct the path
    let bot_name = get_bot_name_from_id(state, &user.bot_id)?;
    let work_path = Path::new(&gb_dir)
        .join("work")
        .join(format!("{}.gbai/{}.gbdialog", bot_name, bot_name));
    let mcp_path = work_path.join(format!("{}.mcp.json", tool_name));

    trace!("Checking for tool .mcp.json at: {:?}", mcp_path);

    if !mcp_path.exists() {
        warn!(
            "Tool '{}' .mcp.json file not found at {:?}",
            tool_name, mcp_path
        );
        return Err(format!(
            "Tool '{}' is not available. .mcp.json file not found.",
            tool_name
        ));
    }

    info!(
        "Tool '{}' .mcp.json found, proceeding with session association",
        tool_name
    );

    let mut conn = state.conn.get().map_err(|e| format!("DB error: {}", e))?;
    let association_id = Uuid::new_v4().to_string();
    let session_id_str = user.id.to_string();
    let added_at = chrono::Utc::now().to_rfc3339();
    let insert_result: Result<usize, diesel::result::Error> =
        diesel::insert_into(session_tool_associations::table)
            .values((
                session_tool_associations::id.eq(&association_id),
                session_tool_associations::session_id.eq(&session_id_str),
                session_tool_associations::tool_name.eq(tool_name),
                session_tool_associations::added_at.eq(&added_at),
            ))
            .on_conflict((
                session_tool_associations::session_id,
                session_tool_associations::tool_name,
            ))
            .do_nothing()
            .execute(&mut *conn);
    match insert_result {
        Ok(rows_affected) => {
            if rows_affected > 0 {
                trace!(
                    "Tool '{}' newly associated with session '{}' (user: {}, bot: {})",
                    tool_name,
                    user.id,
                    user.user_id,
                    user.bot_id
                );
                Ok(format!(
                    "Tool '{}' is now available in this conversation",
                    tool_name
                ))
            } else {
                trace!(
                    "Tool '{}' was already associated with session '{}'",
                    tool_name,
                    user.id
                );
                Ok(format!(
                    "Tool '{}' is already available in this conversation",
                    tool_name
                ))
            }
        }
        Err(e) => {
            error!(
                "Failed to associate tool '{}' with session '{}': {}",
                tool_name, user.id, e
            );
            Err(format!("Failed to add tool to session: {}", e))
        }
    }
}
pub fn get_session_tools(
    conn: &mut PgConnection,
    session_id: &Uuid,
) -> Result<Vec<String>, diesel::result::Error> {
    use crate::shared::models::schema::session_tool_associations;
    let session_id_str = session_id.to_string();
    session_tool_associations::table
        .filter(session_tool_associations::session_id.eq(&session_id_str))
        .select(session_tool_associations::tool_name)
        .load::<String>(conn)
}
pub fn clear_session_tools(
    conn: &mut PgConnection,
    session_id: &Uuid,
) -> Result<usize, diesel::result::Error> {
    use crate::shared::models::schema::session_tool_associations;
    let session_id_str = session_id.to_string();
    diesel::delete(
        session_tool_associations::table
            .filter(session_tool_associations::session_id.eq(&session_id_str)),
    )
    .execute(conn)
}

fn get_bot_name_from_id(state: &AppState, bot_id: &uuid::Uuid) -> Result<String, String> {
    use crate::shared::models::schema::bots;
    let mut conn = state.conn.get().map_err(|e| format!("DB error: {}", e))?;
    let bot_name: String = bots::table
        .filter(bots::id.eq(bot_id))
        .select(bots::name)
        .first(&mut *conn)
        .map_err(|e| format!("Failed to get bot name for id {}: {}", bot_id, e))?;
    Ok(bot_name)
}