// Copyright 2019. The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use crate::contacts_service::{
    handle::ContactsServiceHandle,
    service::ContactsService,
    storage::database::{ContactsBackend, ContactsDatabase},
};
use futures::{future, Future};
use log::*;
use tari_service_framework::{
    handles::ServiceHandlesFuture,
    reply_channel,
    ServiceInitializationError,
    ServiceInitializer,
};
use tari_shutdown::ShutdownSignal;
use tokio::runtime;

pub mod error;
pub mod handle;
pub mod service;
pub mod storage;

const LOG_TARGET: &str = "wallet::contacts_service::initializer";

pub struct ContactsServiceInitializer<T>
where T: ContactsBackend
{
    backend: Option<T>,
}

impl<T> ContactsServiceInitializer<T>
where T: ContactsBackend
{
    pub fn new(backend: T) -> Self {
        Self { backend: Some(backend) }
    }
}

impl<T> ServiceInitializer for ContactsServiceInitializer<T>
where T: ContactsBackend + 'static
{
    type Future = impl Future<Output = Result<(), ServiceInitializationError>>;

    fn initialize(
        &mut self,
        executor: runtime::Handle,
        handles_fut: ServiceHandlesFuture,
        shutdown: ShutdownSignal,
    ) -> Self::Future
    {
        let (sender, receiver) = reply_channel::unbounded();

        let contacts_handle = ContactsServiceHandle::new(sender);

        // Register handle before waiting for handles to be ready
        handles_fut.register(contacts_handle);

        let backend = self
            .backend
            .take()
            .expect("Cannot start Contacts Service without setting a storage backend");

        executor.spawn(async move {
            let service = ContactsService::new(receiver, ContactsDatabase::new(backend)).start();

            futures::pin_mut!(service);
            future::select(service, shutdown).await;
            info!(target: LOG_TARGET, "Contacts service shutdown");
        });
        future::ready(Ok(()))
    }
}
