use chrono::Utc;
use lampada::{Connected, WriteMessage, error::WriteError};
use stanza::client::{
    Stanza,
    iq::{self, Iq, IqType},
};
use tokio::sync::oneshot;
use tracing::{debug, info};
use uuid::Uuid;

use crate::{
    Command, UpdateMessage,
    chat::Message,
    error::{Error, MessageSendError, RosterError, StatusError},
    roster::Contact,
};

use super::ClientLogic;

pub async fn handle_online(logic: ClientLogic, command: Command, connection: Connected) {
    match command {
        Command::GetRoster(result_sender) => {
            let iq_id = Uuid::new_v4().to_string();
            let (send, iq_recv) = oneshot::channel();
            {
                logic.pending().lock().await.insert(iq_id.clone(), send);
            }
            let stanza = Stanza::Iq(Iq {
                from: Some(connection.jid().clone()),
                id: iq_id.to_string(),
                to: None,
                r#type: IqType::Get,
                lang: None,
                query: Some(iq::Query::Roster(stanza::roster::Query {
                    ver: None,
                    items: Vec::new(),
                })),
                errors: Vec::new(),
            });
            let (send, recv) = oneshot::channel();
            let _ = connection
                .write_handle()
                .send(WriteMessage {
                    stanza,
                    respond_to: send,
                })
                .await;
            // TODO: timeout
            match recv.await {
                Ok(Ok(())) => info!("roster request sent"),
                Ok(Err(e)) => {
                    // TODO: log errors if fail to send
                    let _ = result_sender.send(Err(RosterError::Write(e.into())));
                    return;
                }
                Err(e) => {
                    let _ =
                        result_sender.send(Err(RosterError::Write(WriteError::Actor(e.into()))));
                    return;
                }
            };
            // TODO: timeout
            match iq_recv.await {
                Ok(Ok(stanza)) => match stanza {
                    Stanza::Iq(Iq {
                        from: _,
                        id,
                        to: _,
                        r#type,
                        lang: _,
                        query: Some(iq::Query::Roster(stanza::roster::Query { ver: _, items })),
                        errors: _,
                    }) if id == iq_id && r#type == IqType::Result => {
                        let contacts: Vec<Contact> =
                            items.into_iter().map(|item| item.into()).collect();
                        if let Err(e) = logic.db().replace_cached_roster(contacts.clone()).await {
                            logic
                                .update_sender()
                                .send(UpdateMessage::Error(Error::Roster(RosterError::Cache(
                                    e.into(),
                                ))))
                                .await;
                        };
                        result_sender.send(Ok(contacts));
                        return;
                    }
                    ref s @ Stanza::Iq(Iq {
                        from: _,
                        ref id,
                        to: _,
                        r#type,
                        lang: _,
                        query: _,
                        ref errors,
                    }) if *id == iq_id && r#type == IqType::Error => {
                        if let Some(error) = errors.first() {
                            result_sender.send(Err(RosterError::StanzaError(error.clone())));
                        } else {
                            result_sender.send(Err(RosterError::UnexpectedStanza(s.clone())));
                        }
                        return;
                    }
                    s => {
                        result_sender.send(Err(RosterError::UnexpectedStanza(s)));
                        return;
                    }
                },
                Ok(Err(e)) => {
                    result_sender.send(Err(RosterError::Read(e)));
                    return;
                }
                Err(e) => {
                    result_sender.send(Err(RosterError::Write(WriteError::Actor(e.into()))));
                    return;
                }
            }
        }
        Command::GetChats(sender) => {
            let chats = logic.db().read_chats().await.map_err(|e| e.into());
            sender.send(chats);
        }
        Command::GetChatsOrdered(sender) => {
            let chats = logic.db().read_chats_ordered().await.map_err(|e| e.into());
            sender.send(chats);
        }
        Command::GetChatsOrderedWithLatestMessages(sender) => {
            let chats = logic
                .db()
                .read_chats_ordered_with_latest_messages()
                .await
                .map_err(|e| e.into());
            sender.send(chats);
        }
        Command::GetChat(jid, sender) => {
            let chats = logic.db().read_chat(jid).await.map_err(|e| e.into());
            sender.send(chats);
        }
        Command::GetMessages(jid, sender) => {
            let messages = logic
                .db()
                .read_message_history(jid)
                .await
                .map_err(|e| e.into());
            sender.send(messages);
        }
        Command::DeleteChat(jid, sender) => {
            let result = logic.db().delete_chat(jid).await.map_err(|e| e.into());
            sender.send(result);
        }
        Command::DeleteMessage(uuid, sender) => {
            let result = logic.db().delete_message(uuid).await.map_err(|e| e.into());
            sender.send(result);
        }
        Command::GetUser(jid, sender) => {
            let user = logic.db().read_user(jid).await.map_err(|e| e.into());
            sender.send(user);
        }
        // TODO: offline queue to modify roster
        Command::AddContact(jid, sender) => {
            let iq_id = Uuid::new_v4().to_string();
            let set_stanza = Stanza::Iq(Iq {
                from: Some(connection.jid().clone()),
                id: iq_id.clone(),
                to: None,
                r#type: IqType::Set,
                lang: None,
                query: Some(iq::Query::Roster(stanza::roster::Query {
                    ver: None,
                    items: vec![stanza::roster::Item {
                        approved: None,
                        ask: false,
                        jid,
                        name: None,
                        subscription: None,
                        groups: Vec::new(),
                    }],
                })),
                errors: Vec::new(),
            });
            let (send, recv) = oneshot::channel();
            {
                logic.pending().lock().await.insert(iq_id.clone(), send);
            }
            // TODO: write_handle send helper function
            let result = connection.write_handle().write(set_stanza).await;
            if let Err(e) = result {
                sender.send(Err(RosterError::Write(e)));
                return;
            }
            let iq_result = recv.await;
            match iq_result {
                Ok(i) => match i {
                    Ok(iq_result) => match iq_result {
                        Stanza::Iq(Iq {
                            from: _,
                            id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            errors: _,
                        }) if id == iq_id && r#type == IqType::Result => {
                            sender.send(Ok(()));
                            return;
                        }
                        ref s @ Stanza::Iq(Iq {
                            from: _,
                            ref id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            ref errors,
                        }) if *id == iq_id && r#type == IqType::Error => {
                            if let Some(error) = errors.first() {
                                sender.send(Err(RosterError::StanzaError(error.clone())));
                            } else {
                                sender.send(Err(RosterError::UnexpectedStanza(s.clone())));
                            }
                            return;
                        }
                        s => {
                            sender.send(Err(RosterError::UnexpectedStanza(s)));
                            return;
                        }
                    },
                    Err(e) => {
                        sender.send(Err(e.into()));
                        return;
                    }
                },
                Err(e) => {
                    sender.send(Err(RosterError::Write(WriteError::Actor(e.into()))));
                    return;
                }
            }
        }
        Command::BuddyRequest(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid.clone()),
                r#type: Some(stanza::client::presence::PresenceType::Subscribe),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            match result {
                Err(_) => {
                    let _ = sender.send(result);
                }
                Ok(()) => {
                    let presence = Stanza::Presence(stanza::client::presence::Presence {
                        from: None,
                        id: None,
                        to: Some(jid),
                        r#type: Some(stanza::client::presence::PresenceType::Subscribed),
                        lang: None,
                        show: None,
                        status: None,
                        priority: None,
                        errors: Vec::new(),
                        delay: None,
                    });
                    let result = connection.write_handle().write(presence).await;
                    let _ = sender.send(result);
                }
            }
        }
        Command::SubscriptionRequest(jid, sender) => {
            // TODO: i should probably have builders
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid),
                r#type: Some(stanza::client::presence::PresenceType::Subscribe),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            let _ = sender.send(result);
        }
        Command::AcceptBuddyRequest(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid.clone()),
                r#type: Some(stanza::client::presence::PresenceType::Subscribed),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            match result {
                Err(_) => {
                    let _ = sender.send(result);
                }
                Ok(()) => {
                    let presence = Stanza::Presence(stanza::client::presence::Presence {
                        from: None,
                        id: None,
                        to: Some(jid),
                        r#type: Some(stanza::client::presence::PresenceType::Subscribe),
                        lang: None,
                        show: None,
                        status: None,
                        priority: None,
                        errors: Vec::new(),
                        delay: None,
                    });
                    let result = connection.write_handle().write(presence).await;
                    let _ = sender.send(result);
                }
            }
        }
        Command::AcceptSubscriptionRequest(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid),
                r#type: Some(stanza::client::presence::PresenceType::Subscribe),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            let _ = sender.send(result);
        }
        Command::UnsubscribeFromContact(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid),
                r#type: Some(stanza::client::presence::PresenceType::Unsubscribe),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            let _ = sender.send(result);
        }
        Command::UnsubscribeContact(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid),
                r#type: Some(stanza::client::presence::PresenceType::Unsubscribed),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            let _ = sender.send(result);
        }
        Command::UnfriendContact(jid, sender) => {
            let presence = Stanza::Presence(stanza::client::presence::Presence {
                from: None,
                id: None,
                to: Some(jid.clone()),
                r#type: Some(stanza::client::presence::PresenceType::Unsubscribe),
                lang: None,
                show: None,
                status: None,
                priority: None,
                errors: Vec::new(),
                delay: None,
            });
            let result = connection.write_handle().write(presence).await;
            match result {
                Err(_) => {
                    let _ = sender.send(result);
                }
                Ok(()) => {
                    let presence = Stanza::Presence(stanza::client::presence::Presence {
                        from: None,
                        id: None,
                        to: Some(jid),
                        r#type: Some(stanza::client::presence::PresenceType::Unsubscribed),
                        lang: None,
                        show: None,
                        status: None,
                        priority: None,
                        errors: Vec::new(),
                        delay: None,
                    });
                    let result = connection.write_handle().write(presence).await;
                    let _ = sender.send(result);
                }
            }
        }
        Command::DeleteContact(jid, sender) => {
            let iq_id = Uuid::new_v4().to_string();
            let set_stanza = Stanza::Iq(Iq {
                from: Some(connection.jid().clone()),
                id: iq_id.clone(),
                to: None,
                r#type: IqType::Set,
                lang: None,
                query: Some(iq::Query::Roster(stanza::roster::Query {
                    ver: None,
                    items: vec![stanza::roster::Item {
                        approved: None,
                        ask: false,
                        jid,
                        name: None,
                        subscription: Some(stanza::roster::Subscription::Remove),
                        groups: Vec::new(),
                    }],
                })),
                errors: Vec::new(),
            });
            let (send, recv) = oneshot::channel();
            {
                logic.pending().lock().await.insert(iq_id.clone(), send);
            }
            let result = connection.write_handle().write(set_stanza).await;
            if let Err(e) = result {
                sender.send(Err(RosterError::Write(e)));
                return;
            }
            let iq_result = recv.await;
            match iq_result {
                Ok(i) => match i {
                    Ok(iq_result) => match iq_result {
                        Stanza::Iq(Iq {
                            from: _,
                            id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            errors: _,
                        }) if id == iq_id && r#type == IqType::Result => {
                            sender.send(Ok(()));
                            return;
                        }
                        ref s @ Stanza::Iq(Iq {
                            from: _,
                            ref id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            ref errors,
                        }) if *id == iq_id && r#type == IqType::Error => {
                            if let Some(error) = errors.first() {
                                sender.send(Err(RosterError::StanzaError(error.clone())));
                            } else {
                                sender.send(Err(RosterError::UnexpectedStanza(s.clone())));
                            }
                            return;
                        }
                        s => {
                            sender.send(Err(RosterError::UnexpectedStanza(s)));
                            return;
                        }
                    },
                    Err(e) => {
                        sender.send(Err(e.into()));
                        return;
                    }
                },
                Err(e) => {
                    sender.send(Err(RosterError::Write(WriteError::Actor(e.into()))));
                    return;
                }
            }
        }
        Command::UpdateContact(jid, contact_update, sender) => {
            let iq_id = Uuid::new_v4().to_string();
            let groups = Vec::from_iter(
                contact_update
                    .groups
                    .into_iter()
                    .map(|group| stanza::roster::Group(Some(group))),
            );
            let set_stanza = Stanza::Iq(Iq {
                from: Some(connection.jid().clone()),
                id: iq_id.clone(),
                to: None,
                r#type: IqType::Set,
                lang: None,
                query: Some(iq::Query::Roster(stanza::roster::Query {
                    ver: None,
                    items: vec![stanza::roster::Item {
                        approved: None,
                        ask: false,
                        jid,
                        name: contact_update.name,
                        subscription: None,
                        groups,
                    }],
                })),
                errors: Vec::new(),
            });
            let (send, recv) = oneshot::channel();
            {
                logic.pending().lock().await.insert(iq_id.clone(), send);
            }
            let result = connection.write_handle().write(set_stanza).await;
            if let Err(e) = result {
                sender.send(Err(RosterError::Write(e)));
                return;
            }
            let iq_result = recv.await;
            match iq_result {
                Ok(i) => match i {
                    Ok(iq_result) => match iq_result {
                        Stanza::Iq(Iq {
                            from: _,
                            id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            errors: _,
                        }) if id == iq_id && r#type == IqType::Result => {
                            sender.send(Ok(()));
                            return;
                        }
                        ref s @ Stanza::Iq(Iq {
                            from: _,
                            ref id,
                            to: _,
                            r#type,
                            lang: _,
                            query: _,
                            ref errors,
                        }) if *id == iq_id && r#type == IqType::Error => {
                            if let Some(error) = errors.first() {
                                sender.send(Err(RosterError::StanzaError(error.clone())));
                            } else {
                                sender.send(Err(RosterError::UnexpectedStanza(s.clone())));
                            }
                            return;
                        }
                        s => {
                            sender.send(Err(RosterError::UnexpectedStanza(s)));
                            return;
                        }
                    },
                    Err(e) => {
                        sender.send(Err(e.into()));
                        return;
                    }
                },
                Err(e) => {
                    sender.send(Err(RosterError::Write(WriteError::Actor(e.into()))));
                    return;
                }
            }
        }
        Command::SetStatus(online, sender) => {
            let result = logic.db().upsert_cached_status(online.clone()).await;
            if let Err(e) = result {
                let _ = logic
                    .update_sender()
                    .send(UpdateMessage::Error(Error::SetStatus(StatusError::Cache(
                        e.into(),
                    ))))
                    .await;
            }
            let result = connection
                .write_handle()
                .write(Stanza::Presence(online.into_stanza(None)))
                .await
                .map_err(|e| StatusError::Write(e));
            // .map_err(|e| StatusError::Write(e));
            let _ = sender.send(result);
        }
        // TODO: offline message queue
        Command::SendMessage(jid, body, sender) => {
            let id = Uuid::new_v4();
            let message = Stanza::Message(stanza::client::message::Message {
                from: Some(connection.jid().clone()),
                id: Some(id.to_string()),
                to: Some(jid.clone()),
                // TODO: specify message type
                r#type: stanza::client::message::MessageType::Chat,
                // TODO: lang ?
                lang: None,
                subject: None,
                body: Some(stanza::client::message::Body {
                    lang: None,
                    body: Some(body.body.clone()),
                }),
                thread: None,
                delay: None,
            });
            let _ = sender.send(Ok(()));
            // let _ = sender.send(Ok(message.clone()));
            let result = connection.write_handle().write(message).await;
            match result {
                Ok(_) => {
                    let mut message = Message {
                        id,
                        from: connection.jid().clone(),
                        body,
                        timestamp: Utc::now(),
                    };
                    info!("send message {:?}", message);
                    if let Err(e) = logic
                        .db()
                        .create_message_with_self_resource_and_chat(message.clone(), jid.clone())
                        .await
                        .map_err(|e| e.into())
                    {
                        tracing::error!("{}", e);
                        let _ =
                            logic
                                .update_sender()
                                .send(UpdateMessage::Error(Error::MessageSend(
                                    MessageSendError::MessageHistory(e),
                                )));
                    }
                    // TODO: don't do this, have separate from from details
                    message.from = message.from.as_bare();
                    let _ = logic
                        .update_sender()
                        .send(UpdateMessage::Message { to: jid, message })
                        .await;
                }
                Err(_) => {
                    // let _ = sender.send(result);
                }
            }
        }
        Command::SendPresence(jid, presence, sender) => {
            let mut presence: stanza::client::presence::Presence = presence.into();
            if let Some(jid) = jid {
                presence.to = Some(jid);
            };
            let result = connection
                .write_handle()
                .write(Stanza::Presence(presence))
                .await;
            // .map_err(|e| StatusError::Write(e));
            let _ = sender.send(result);
        }
    }
}