pub mod action;
mod document;
mod message;
mod mtterror;
mod name;
mod queue;

use action::{
    Action, Addition, CalcValue, Calculation, DocDef, Field, FieldType, MsgAction, Operand, Query,
    UserAction,
};
use document::{Clock, CreateDoc, Session};
use message::{wrapper::Message, MessageAction};
use queue::{
    data_director::{Include, Path, RegMsg, Register},
    router::Queue,
};
use std::sync::mpsc::{channel, Receiver};
use uuid::Uuid;

pub use mtterror::{ErrorID, MTTError};
pub use name::{Name, NameType};

#[cfg(test)]
mod support_tests {
    use std::time::Duration;

    pub static TIMEOUT: Duration = Duration::from_millis(500);
}

#[derive(Clone)]
pub struct MoreThanText {
    queue: Queue,
}

impl MoreThanText {
    pub fn new() -> Self {
        let queue = Queue::new();
        Clock::start(queue.clone());
        CreateDoc::start(queue.clone());
        Session::start(queue.clone());
        Self { queue: queue }
    }

    fn recursive_session_request(
        &mut self,
        rx: Receiver<Message>,
        action: MsgAction,
        msg: Message,
    ) -> Uuid {
        let reply = msg.response(action);
        self.queue.send(reply);
        let result = rx.recv().unwrap();
        match result.get_action() {
            MsgAction::Records(data) => {
                if data.len() == 0 {
                    self.recursive_session_request(
                        rx,
                        Addition::new(Session::doc_names()[0].clone()).into(),
                        msg,
                    )
                } else {
                    let rec = data.iter().last().unwrap();
                    let field = rec.get(Name::english("id")).unwrap();
                    match field {
                        Field::Uuid(result) => result,
                        _ => unreachable!("should only receive uuid"),
                    }
                }
            }
            _ => unreachable!("session queries should always return"),
        }
    }

    pub fn validate_session(&mut self, session: Option<String>) -> Uuid {
        let (tx, rx) = channel();
        let sender_id = self.queue.add_sender(tx);
        let new_session: MsgAction = Addition::new(Session::doc_names()[0].clone()).into();
        let action = match session {
            Some(data) => match Uuid::try_from(data.as_str()) {
                Ok(id) => {
                    let mut query = Query::new(Session::doc_names()[0].clone());
                    let mut calc = Calculation::new(Operand::Equal);
                    calc.add_value(CalcValue::Existing(FieldType::Uuid))
                        .unwrap();
                    calc.add_value(id).unwrap();
                    query.add(Name::english("id"), calc);
                    query.into()
                }
                Err(_) => new_session,
            },
            None => new_session,
        };
        let doc_name = Name::english("session");
        let msg = Message::new(action.clone());
        let msg_id = msg.get_message_id();
        let path = Path::new(
            Include::Just(msg_id.clone()),
            Include::Just(doc_name.clone().into()),
            Include::Just(Action::Records),
        );
        let reg_msg = Register::new(sender_id.clone(), RegMsg::AddRoute(path));
        self.queue.send(msg.forward(NameType::None, reg_msg));
        rx.recv().unwrap(); // Wait for completion.
        let output = self.recursive_session_request(rx, action, msg);
        self.queue.remove_sender(&sender_id);
        output
    }

    pub fn request<UA>(&mut self, req: UA) -> Result<String, MTTError>
    where
        UA: Into<UserAction>,
    {
        Ok("something".to_string())
    }

    pub fn get_document(&self, name: &str, id: &str) -> Result<String, MTTError> {
        if name == "page" {
            Ok("something".to_string())
        } else {
            Err(MTTError::new(NameType::None, ErrorID::DocumentNotFound))
        }
    }
}