//! Example illustrating how to run the ETH JSON RPC API as standalone over a DB file.
//!
//! Run with
//!
//! ```not_rust
//! cargo run -p rpc-db
//! ```
//!
//! This installs an additional RPC method `myrpcExt_customMethod` that can queried via [cast](https://github.com/foundry-rs/foundry)
//!
//! ```sh
//! cast rpc myrpcExt_customMethod
//! ```

use std::{path::Path, sync::Arc};

use reth::{
    providers::{
        providers::{BlockchainProvider, StaticFileProvider},
        ProviderFactory,
    },
    rpc::eth::EthApi,
    utils::open_db_read_only,
};
use reth_chainspec::ChainSpecBuilder;
use reth_db::mdbx::DatabaseArguments;
use reth_db_api::models::ClientVersion;

// Bringing up the RPC
use reth::rpc::builder::{
    RethRpcModule, RpcModuleBuilder, RpcServerConfig, TransportRpcModuleConfig,
};
// Configuring the network parts, ideally also wouldn't need to think about this.
use myrpc_ext::{MyRpcExt, MyRpcExtApiServer};
use reth::{blockchain_tree::noop::NoopBlockchainTree, tasks::TokioTaskExecutor};
use reth_node_ethereum::EthEvmConfig;
use reth_provider::test_utils::TestCanonStateSubscriptions;

// Custom rpc extension
pub mod myrpc_ext;

#[tokio::main]
async fn main() -> eyre::Result<()> {
    // 1. Setup the DB
    let db_path = std::env::var("RETH_DB_PATH")?;
    let db_path = Path::new(&db_path);
    let db = Arc::new(open_db_read_only(
        db_path.join("db").as_path(),
        DatabaseArguments::new(ClientVersion::default()),
    )?);
    let spec = Arc::new(ChainSpecBuilder::mainnet().build());
    let factory = ProviderFactory::new(
        db.clone(),
        spec.clone(),
        StaticFileProvider::read_only(db_path.join("static_files"))?,
    );

    // 2. Setup the blockchain provider using only the database provider and a noop for the tree to
    //    satisfy trait bounds. Tree is not used in this example since we are only operating on the
    //    disk and don't handle new blocks/live sync etc, which is done by the blockchain tree.
    let provider = BlockchainProvider::new(factory, Arc::new(NoopBlockchainTree::default()))?;

    let rpc_builder = RpcModuleBuilder::default()
        .with_provider(provider.clone())
        // Rest is just noops that do nothing
        .with_noop_pool()
        .with_noop_network()
        .with_executor(TokioTaskExecutor::default())
        .with_evm_config(EthEvmConfig::default())
        .with_events(TestCanonStateSubscriptions::default());

    // Pick which namespaces to expose.
    let config = TransportRpcModuleConfig::default().with_http([RethRpcModule::Eth]);
    let mut server = rpc_builder.build(config, Box::new(EthApi::with_spawner));

    // Add a custom rpc namespace
    let custom_rpc = MyRpcExt { provider };
    server.merge_configured(custom_rpc.into_rpc())?;

    // Start the server & keep it alive
    let server_args =
        RpcServerConfig::http(Default::default()).with_http_address("0.0.0.0:8545".parse()?);
    let _handle = server_args.start(&server).await?;
    futures::future::pending::<()>().await;

    Ok(())
}