use std::collections::HashMap;
use std::sync::{Arc, RwLock};

use color_eyre::Result;
use futures_lite::StreamExt;
use futures_signals::signal::{Mutable, MutableSignalCloned};
use tracing::error;
use zbus::Connection;
use zbus::zvariant::ObjectPath;

use crate::clients::networkmanager::dbus::{ActiveConnectionDbusProxy, DbusProxy, DeviceDbusProxy};
use crate::clients::networkmanager::state::{
    CellularState, State, VpnState, WifiState, WiredState, determine_cellular_state,
    determine_vpn_state, determine_wifi_state, determine_wired_state,
};
use crate::{
    read_lock, register_fallible_client, spawn_blocking, spawn_blocking_result, write_lock,
};

mod dbus;
pub mod state;

type PathMap<'l, ValueType> = HashMap<ObjectPath<'l>, ValueType>;

#[derive(Debug)]
pub struct Client(Arc<ClientInner<'static>>);

#[derive(Debug)]
struct ClientInner<'l> {
    state: Mutable<State>,
    root_object: &'l DbusProxy<'l>,
    active_connections: RwLock<PathMap<'l, ActiveConnectionDbusProxy<'l>>>,
    devices: RwLock<PathMap<'l, DeviceDbusProxy<'l>>>,
    dbus_connection: Connection,
}

impl Client {
    async fn new() -> Result<Client> {
        let state = Mutable::new(State {
            wired: WiredState::Unknown,
            wifi: WifiState::Unknown,
            cellular: CellularState::Unknown,
            vpn: VpnState::Unknown,
        });
        let dbus_connection = Connection::system().await?;
        let root_object = {
            let root_object = DbusProxy::new(&dbus_connection).await?;
            // Workaround for the fact that zbus (unnecessarily) requires a static lifetime here
            Box::leak(Box::new(root_object))
        };

        Ok(Client(Arc::new(ClientInner {
            state,
            root_object,
            active_connections: RwLock::new(HashMap::new()),
            devices: RwLock::new(HashMap::new()),
            dbus_connection,
        })))
    }

    async fn run(&self) -> Result<()> {
        // TODO: Reimplement DBus watching without these write-only macros

        let mut active_connections_stream = self.0.root_object.receive_active_connections_changed().await;
        while let Some(change) = active_connections_stream.next().await {

        }

        // ActiveConnectionDbusProxy::builder(&self.0.dbus_connection)

        // macro_rules! update_state_for_device_change {
        //     ($client:ident) => {
        //         $client.state.set(State {
        //             wired: determine_wired_state(&read_lock!($client.devices)).await?,
        //             wifi: determine_wifi_state(&read_lock!($client.devices)).await?,
        //             cellular: determine_cellular_state(&read_lock!($client.devices)).await?,
        //             vpn: $client.state.get_cloned().vpn,
        //         });
        //     };
        // }
        //
        // macro_rules! initialise_path_map {
        //     (
        //         $client:expr,
        //         $path_map:ident,
        //         $proxy_type:ident
        //         $(, |$new_path:ident| $property_watcher:expr)*
        //     ) => {
        //         let new_paths = $client.root_object.$path_map().await?;
        //         let mut path_map = HashMap::new();
        //         for new_path in new_paths {
        //             let new_proxy = $proxy_type::builder(&$client.dbus_connection)
        //                 .path(new_path.clone())?
        //                 .build().await?;
        //             path_map.insert(new_path.clone(), new_proxy);
        //             $({
        //                 let $new_path = &new_path;
        //                 $property_watcher;
        //             })*
        //         }
        //         *write_lock!($client.$path_map) = path_map;
        //     };
        // }
        //
        // macro_rules! spawn_path_list_watcher {
        //     (
        //         $client:expr,
        //         $property:ident,
        //         $property_changes:ident,
        //         $proxy_type:ident,
        //         |$state_client:ident| $state_update:expr
        //         $(, |$property_client:ident, $new_path:ident| $property_watcher:expr)*
        //     ) => {
        //         let client = $client.clone();
        //
        //         let changes = client.root_object.$property_changes();
        //         for _ in changes {
        //             let mut new_path_map = HashMap::new();
        //             {
        //                 let new_paths = client.root_object.$property()?;
        //                 let path_map = read_lock!(client.$property);
        //                 for new_path in new_paths {
        //                     if path_map.contains_key(&new_path) {
        //                         let proxy = path_map
        //                             .get(&new_path)
        //                             .expect("Should contain the key, guarded by runtime check");
        //                         new_path_map.insert(new_path, proxy.to_owned());
        //                     } else {
        //                         let new_proxy = $proxy_type::builder(&client.dbus_connection)
        //                             .path(new_path.clone())?
        //                             .build()?;
        //                         new_path_map.insert(new_path.clone(), new_proxy);
        //                         $({
        //                             let $property_client = &client;
        //                             let $new_path = &new_path;
        //                             $property_watcher;
        //                         })*
        //                     }
        //                 }
        //             }
        //             *write_lock!(client.$property) = new_path_map;
        //             let $state_client = &client;
        //             $state_update;
        //         }
        //     }
        // }
        //
        // macro_rules! spawn_property_watcher {
        //     (
        //         $client:expr,
        //         $path:expr,
        //         $property_changes:ident,
        //         $containing_list:ident,
        //         |$inner_client:ident| $state_update:expr
        //     ) => {
        //         let client = $client.clone();
        //         let path = $path.clone();
        //
        //         let changes = read_lock!(client.$containing_list)
        //             .get(&path)
        //             .expect("Should contain the key upon watcher start")
        //             .$property_changes().await;
        //         for _ in changes {
        //             if !read_lock!(client.$containing_list).contains_key(&path) {
        //                 break;
        //             }
        //             let $inner_client = &client;
        //             $state_update;
        //         }
        //     };
        // }
        //
        // initialise_path_map!(self.0, active_connections, ActiveConnectionDbusProxy);
        // initialise_path_map!(self.0, devices, DeviceDbusProxy, |path| {
        //     spawn_property_watcher!(self.0, path, receive_state_changed, devices, |client| {
        //         update_state_for_device_change!(client);
        //     });
        // });
        // self.0.state.set(State {
        //     wired: determine_wired_state(&read_lock!(self.0.devices))?,
        //     wifi: determine_wifi_state(&read_lock!(self.0.devices))?,
        //     cellular: determine_cellular_state(&read_lock!(self.0.devices))?,
        //     vpn: determine_vpn_state(&read_lock!(self.0.active_connections))?,
        // });
        //
        // spawn_path_list_watcher!(
        //     self.0,
        //     active_connections,
        //     receive_active_connections_changed,
        //     ActiveConnectionDbusProxy,
        //     |client| {
        //         client.state.set(State {
        //             wired: client.state.get_cloned().wired,
        //             wifi: client.state.get_cloned().wifi,
        //             cellular: client.state.get_cloned().cellular,
        //             vpn: determine_vpn_state(&read_lock!(client.active_connections))?,
        //         });
        //     }
        // );
        // spawn_path_list_watcher!(
        //     self.0,
        //     devices,
        //     receive_devices_changed,
        //     DeviceDbusProxy,
        //     |client| {
        //         update_state_for_device_change!(client);
        //     },
        //     |client, path| {
        //         spawn_property_watcher!(client, path, receive_state_changed, devices, |client| {
        //             update_state_for_device_change!(client);
        //         });
        //     }
        // );

        Ok(())
    }

    pub fn subscribe(&self) -> MutableSignalCloned<State> {
        self.0.state.signal_cloned()
    }
}

pub async fn create_client() -> Result<Arc<Client>> {
    let client = Arc::new(Client::new().await?);
    client.run().await?;
    Ok(client)
}

register_fallible_client!(Client, network_manager);