// Copyright (c) 2022-2024 Niko Bonnieure, Par le Peuple, NextGraph.org developers
// All rights reserved.
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE2 or http://www.apache.org/licenses/LICENSE-2.0>
// or the MIT license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.

use std::collections::HashMap;
use std::fs::write;

use async_std::stream::StreamExt;
use serde::{Deserialize, Serialize};
use serde_json::Value;
use tauri::scope::ipc::RemoteDomainAccessScope;
use tauri::utils::config::WindowConfig;
use tauri::{path::BaseDirectory, App, Manager};

use ng_repo::errors::NgError;
use ng_repo::log::*;
use ng_repo::types::*;

use ng_net::types::{ClientInfo, CreateAccountBSP, Invitation};
use ng_net::utils::{decode_invitation_string, spawn_and_log_error, Receiver, ResultSend};

use ng_wallet::types::*;
use ng_wallet::*;

use nextgraph::local_broker::*;
use nextgraph::verifier::types::*;

#[cfg(mobile)]
mod mobile;
#[cfg(mobile)]
pub use mobile::*;

pub type SetupHook = Box<dyn FnOnce(&mut App) -> Result<(), Box<dyn std::error::Error>> + Send>;

#[tauri::command(rename_all = "snake_case")]
async fn test(app: tauri::AppHandle) -> Result<(), ()> {
    let path = app
        .path()
        .resolve("", BaseDirectory::AppLocalData)
        .map_err(|_| NgError::SerializationError)
        .unwrap();
    init_local_broker(Box::new(move || LocalBrokerConfig::BasePath(path.clone()))).await;

    //log_debug!("test is {}", BROKER.read().await.test());
    // let path = app
    //     .path()
    //     .resolve("storage", BaseDirectory::AppLocalData)
    //     .map_err(|_| ())?;

    //BROKER.read().await.test_storage(path);

    Ok(())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_gen_shuffle_for_pazzle_opening(pazzle_length: u8) -> Result<ShuffledPazzle, ()> {
    // log_debug!(
    //     "wallet_gen_shuffle_for_pazzle_opening from rust {}",
    //     pazzle_length
    // );
    Ok(gen_shuffle_for_pazzle_opening(pazzle_length))
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_gen_shuffle_for_pin() -> Result<Vec<u8>, ()> {
    //log_debug!("wallet_gen_shuffle_for_pin from rust");
    Ok(gen_shuffle_for_pin())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_open_with_pazzle(
    wallet: Wallet,
    pazzle: Vec<u8>,
    pin: [u8; 4],
    _app: tauri::AppHandle,
) -> Result<SensitiveWallet, String> {
    //log_debug!("wallet_open_with_pazzle from rust {:?}", pazzle);
    let wallet = nextgraph::local_broker::wallet_open_with_pazzle(&wallet, pazzle, pin)
        .map_err(|e| e.to_string())?;
    Ok(wallet)
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_get_file(wallet_name: String, app: tauri::AppHandle) -> Result<(), String> {
    let ser = nextgraph::local_broker::wallet_get_file(&wallet_name)
        .await
        .map_err(|e| e.to_string())?;

    // save wallet file to Downloads folder
    let path = app
        .path()
        .resolve(
            format!("wallet-{}.ngw", wallet_name),
            BaseDirectory::Download,
        )
        .unwrap();
    write(path, &ser).map_err(|e| e.to_string())?;
    Ok(())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_create(
    mut params: CreateWalletV0,
    app: tauri::AppHandle,
) -> Result<CreateWalletResultV0, String> {
    //log_debug!("wallet_create from rust {:?}", params);
    params.result_with_wallet_file = !params.local_save;
    let local_save = params.local_save;
    let mut cwr = nextgraph::local_broker::wallet_create_v0(params)
        .await
        .map_err(|e| e.to_string())?;
    if !local_save {
        // save wallet file to Downloads folder
        let path = app
            .path()
            .resolve(
                format!("wallet-{}.ngw", cwr.wallet_name),
                BaseDirectory::Download,
            )
            .unwrap();
        let _r = write(path, &cwr.wallet_file);
        cwr.wallet_file = vec![];
    }
    Ok(cwr)
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_read_file(file: Vec<u8>, _app: tauri::AppHandle) -> Result<Wallet, String> {
    nextgraph::local_broker::wallet_read_file(file)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_was_opened(
    opened_wallet: SensitiveWallet,
    _app: tauri::AppHandle,
) -> Result<ClientV0, String> {
    nextgraph::local_broker::wallet_was_opened(opened_wallet)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_import(
    encrypted_wallet: Wallet,
    opened_wallet: SensitiveWallet,
    in_memory: bool,
    _app: tauri::AppHandle,
) -> Result<ClientV0, String> {
    nextgraph::local_broker::wallet_import(encrypted_wallet, opened_wallet, in_memory)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn get_wallets(
    app: tauri::AppHandle,
) -> Result<Option<HashMap<String, LocalWalletStorageV0>>, String> {
    let path = app
        .path()
        .resolve("", BaseDirectory::AppLocalData)
        .map_err(|_| NgError::SerializationError)
        .unwrap();
    init_local_broker(Box::new(move || LocalBrokerConfig::BasePath(path.clone()))).await;

    let res = wallets_get_all().await.map_err(|e| {
        log_err!("wallets_get_all error {}", e.to_string());
    });
    if res.is_ok() {
        return Ok(Some(res.unwrap()));
    }
    Ok(None)
}

#[tauri::command(rename_all = "snake_case")]
async fn session_start(
    wallet_name: String,
    user: PubKey,
    _app: tauri::AppHandle,
) -> Result<SessionInfo, String> {
    let config = SessionConfig::new_save(&user, &wallet_name);
    nextgraph::local_broker::session_start(config)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn session_start_remote(
    wallet_name: String,
    user: PubKey,
    peer_id: Option<PubKey>,
    _app: tauri::AppHandle,
) -> Result<SessionInfo, String> {
    let config = SessionConfig::new_remote(&user, &wallet_name, peer_id);
    nextgraph::local_broker::session_start(config)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn encode_create_account(payload: CreateAccountBSP) -> Result<String, ()> {
    //log_debug!("{:?}", payload);
    payload.encode().ok_or(())
}

#[tauri::command(rename_all = "snake_case")]
async fn open_window(
    url: String,
    label: String,
    title: String,
    app: tauri::AppHandle,
) -> Result<(), ()> {
    log_debug!("open window url {:?}", url);
    let already_exists = app.get_window(&label);
    #[cfg(desktop)]
    if already_exists.is_some() {
        let _ = already_exists.unwrap().close();
        std::thread::sleep(std::time::Duration::from_secs(1));
    }
    let mut config = WindowConfig::default();
    config.label = label;
    config.url = tauri::WindowUrl::External(url.parse().unwrap());
    config.title = title;
    let _register_window = tauri::WindowBuilder::from_config(&app, config)
        .build()
        .unwrap();
    Ok(())
}

#[tauri::command(rename_all = "snake_case")]
async fn decode_invitation(invite: String) -> Option<Invitation> {
    decode_invitation_string(invite)
}

#[tauri::command(rename_all = "snake_case")]
async fn app_request_stream(
    session_id: u64,
    request: AppRequest,
    stream_id: &str,
    app: tauri::AppHandle,
) -> Result<(), String> {
    log_debug!("app request stream {} {:?}", stream_id, request);
    let main_window = app.get_window("main").unwrap();

    let reader;
    {
        let cancel;
        (reader, cancel) = nextgraph::local_broker::app_request_stream(session_id, request)
            .await
            .map_err(|e| e.to_string())?;

        nextgraph::local_broker::tauri_stream_add(stream_id.to_string(), cancel)
            .await
            .map_err(|e| e.to_string())?;
    }

    async fn inner_task(
        mut reader: Receiver<AppResponse>,
        stream_id: String,
        main_window: tauri::Window,
    ) -> ResultSend<()> {
        while let Some(app_response) = reader.next().await {
            main_window.emit(&stream_id, app_response).unwrap();
        }

        nextgraph::local_broker::tauri_stream_cancel(stream_id)
            .await
            .map_err(|e| e.to_string())?;

        //log_debug!("END OF LOOP");
        Ok(())
    }

    spawn_and_log_error(inner_task(reader, stream_id.to_string(), main_window));

    Ok(())
}

#[tauri::command(rename_all = "snake_case")]
async fn doc_fetch_private_subscribe() -> Result<AppRequest, String> {
    let request = AppRequest::V0(AppRequestV0 {
        command: AppRequestCommandV0::Fetch(AppFetchContentV0::get_or_subscribe(true)),
        nuri: NuriV0::new_private_store_target(),
        payload: None,
    });
    Ok(request)
}

#[tauri::command(rename_all = "snake_case")]
async fn doc_fetch_repo_subscribe(repo_id: String) -> Result<AppRequest, String> {
    let request = AppRequest::V0(AppRequestV0 {
        command: AppRequestCommandV0::Fetch(AppFetchContentV0::get_or_subscribe(true)),
        nuri: NuriV0::new_repo_target_from_string(repo_id).map_err(|e| e.to_string())?,
        payload: None,
    });
    Ok(request)
}

#[tauri::command(rename_all = "snake_case")]
async fn app_request(
    session_id: u64,
    request: AppRequest,
    _app: tauri::AppHandle,
) -> Result<AppResponse, String> {
    log_debug!("app request {:?}", request);

    nextgraph::local_broker::app_request(session_id, request)
        .await
        .map_err(|e| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn upload_chunk(
    session_id: u64,
    upload_id: u32,
    chunk: serde_bytes::ByteBuf,
    nuri: NuriV0,
    _app: tauri::AppHandle,
) -> Result<AppResponse, String> {
    //log_debug!("upload_chunk {:?}", chunk);

    let request = AppRequest::V0(AppRequestV0 {
        command: AppRequestCommandV0::FilePut,
        nuri,
        payload: Some(AppRequestPayload::V0(
            AppRequestPayloadV0::RandomAccessFilePutChunk((upload_id, chunk)),
        )),
    });

    nextgraph::local_broker::app_request(session_id, request)
        .await
        .map_err(|e| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn cancel_stream(stream_id: &str) -> Result<(), String> {
    log_debug!("cancel stream {}", stream_id);
    Ok(
        nextgraph::local_broker::tauri_stream_cancel(stream_id.to_string())
            .await
            .map_err(|e: NgError| e.to_string())?,
    )
}

#[tauri::command(rename_all = "snake_case")]
async fn disconnections_subscribe(app: tauri::AppHandle) -> Result<(), String> {
    let path = app
        .path()
        .resolve("", BaseDirectory::AppLocalData)
        .map_err(|_| NgError::SerializationError)
        .unwrap();
    init_local_broker(Box::new(move || LocalBrokerConfig::BasePath(path.clone()))).await;

    let main_window = app.get_window("main").unwrap();

    let reader = nextgraph::local_broker::take_disconnections_receiver()
        .await
        .map_err(|e: NgError| e.to_string())?;

    async fn inner_task(
        mut reader: Receiver<String>,
        main_window: tauri::Window,
    ) -> ResultSend<()> {
        while let Some(user_id) = reader.next().await {
            log_debug!("DISCONNECTION FOR {user_id}");
            main_window.emit("disconnections", user_id).unwrap();
        }
        log_debug!("END OF disconnections listener");
        Ok(())
    }

    spawn_and_log_error(inner_task(reader, main_window));

    Ok(())
}

#[tauri::command(rename_all = "snake_case")]
async fn session_stop(user_id: UserId) -> Result<(), String> {
    nextgraph::local_broker::session_stop(&user_id)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn user_disconnect(user_id: UserId) -> Result<(), String> {
    nextgraph::local_broker::user_disconnect(&user_id)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[tauri::command(rename_all = "snake_case")]
async fn wallet_close(wallet_name: String) -> Result<(), String> {
    nextgraph::local_broker::wallet_close(&wallet_name)
        .await
        .map_err(|e: NgError| e.to_string())
}

#[derive(Serialize, Deserialize)]
struct ConnectionInfo {
    pub server_id: String,
    pub server_ip: String,
    pub error: Option<String>,
    pub since: u64,
}

#[tauri::command(rename_all = "snake_case")]
async fn user_connect(
    info: ClientInfo,
    user_id: UserId,
    _location: Option<String>,
) -> Result<HashMap<String, ConnectionInfo>, String> {
    let mut opened_connections: HashMap<String, ConnectionInfo> = HashMap::new();

    let results = nextgraph::local_broker::user_connect_with_device_info(info, &user_id, None)
        .await
        .map_err(|e| e.to_string())?;

    log_debug!("{:?}", results);

    for result in results {
        opened_connections.insert(
            result.0,
            ConnectionInfo {
                server_id: result.1,
                server_ip: result.2,
                error: result.3,
                since: result.4 as u64,
            },
        );
    }

    Ok(opened_connections)
}

#[tauri::command(rename_all = "snake_case")]
fn client_info_rust() -> Result<Value, String> {
    Ok(ng_repo::os_info::get_os_info())
}

#[derive(Default)]
pub struct AppBuilder {
    setup: Option<SetupHook>,
}

#[cfg(debug_assertions)]
const ALLOWED_BSP_DOMAINS: [&str; 2] = ["account-dev.nextgraph.eu", "account-dev.nextgraph.net"];
#[cfg(not(debug_assertions))]
const ALLOWED_BSP_DOMAINS: [&str; 2] = ["account.nextgraph.eu", "account.nextgraph.net"];

impl AppBuilder {
    pub fn new() -> Self {
        Self::default()
    }

    #[must_use]
    pub fn setup<F>(mut self, setup: F) -> Self
    where
        F: FnOnce(&mut App) -> Result<(), Box<dyn std::error::Error>> + Send + 'static,
    {
        self.setup.replace(Box::new(setup));
        self
    }

    pub fn run(self) {
        let setup = self.setup;
        tauri::Builder::default()
            .setup(move |app| {
                if let Some(setup) = setup {
                    (setup)(app)?;
                }

                for domain in ALLOWED_BSP_DOMAINS {
                    app.ipc_scope().configure_remote_access(
                        RemoteDomainAccessScope::new(domain)
                            .add_window("registration")
                            .add_window("main")
                            .add_plugins(["window", "event"]),
                    );
                }
                Ok(())
            })
            .plugin(tauri_plugin_window::init())
            .invoke_handler(tauri::generate_handler![
                test,
                wallet_gen_shuffle_for_pazzle_opening,
                wallet_gen_shuffle_for_pin,
                wallet_open_with_pazzle,
                wallet_was_opened,
                wallet_create,
                wallet_read_file,
                wallet_get_file,
                wallet_import,
                wallet_close,
                encode_create_account,
                session_start,
                session_start_remote,
                session_stop,
                get_wallets,
                open_window,
                decode_invitation,
                disconnections_subscribe,
                user_connect,
                user_disconnect,
                client_info_rust,
                doc_fetch_private_subscribe,
                doc_fetch_repo_subscribe,
                cancel_stream,
                app_request_stream,
                app_request,
                upload_chunk,
            ])
            .run(tauri::generate_context!())
            .expect("error while running tauri application");
    }
}