// Copyright 2020. The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
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// 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.
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use std::sync::Arc;

use tari_common_types::chain_metadata::ChainMetadata;
use tari_comms::peer_manager::NodeId;
use tari_core::base_node::chain_metadata_service::{ChainMetadataEvent, ChainMetadataHandle, PeerChainMetadata};
use tokio::sync::broadcast;

/// Create a mock Chain Metadata stream.
///
/// This struct simulates the chain metadata input stream the base node uses to keep tabs on the blockchain progress
/// in the rest of the network.
#[allow(dead_code)]
pub struct MockChainMetadata {
    publisher: broadcast::Sender<Arc<ChainMetadataEvent>>,
}

#[allow(dead_code)]
impl MockChainMetadata {
    pub fn new() -> Self {
        let (publisher, _) = broadcast::channel(10);
        Self { publisher }
    }

    pub fn chain_metadata_handle(&self) -> ChainMetadataHandle {
        ChainMetadataHandle::new(self.publisher.clone())
    }

    pub fn subscription(&self) -> broadcast::Receiver<Arc<ChainMetadataEvent>> {
        self.publisher.subscribe()
    }

    pub fn publish_event(&mut self, event: ChainMetadataEvent) -> Result<usize, Arc<ChainMetadataEvent>> {
        self.publisher.send(Arc::new(event)).map_err(|err| err.0)
    }

    pub async fn publish_chain_metadata(
        &mut self,
        id: &NodeId,
        metadata: &ChainMetadata,
    ) -> Result<usize, Arc<ChainMetadataEvent>> {
        let data = PeerChainMetadata::new(id.clone(), metadata.clone(), None);
        self.publish_event(ChainMetadataEvent::PeerChainMetadataReceived(data))
    }
}
