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// Copyright (c) Zefchain Labs, Inc.
// SPDX-License-Identifier: Apache-2.0

use std::str::FromStr as _;

use linera_base::time::Duration;
use linera_core::node::{NodeError, ValidatorNodeProvider};

use super::GrpcClient;
use crate::{
    config::ValidatorPublicNetworkConfig,
    grpc::{pool::GrpcConnectionPool, transport},
    node_provider::NodeOptions,
};

#[derive(Clone)]
pub struct GrpcNodeProvider {
    pool: GrpcConnectionPool,
    retry_delay: Duration,
    max_retries: u32,
}

impl GrpcNodeProvider {
    pub fn new(options: NodeOptions) -> Self {
        let transport_options = transport::Options::from(&options);
        let retry_delay = options.retry_delay;
        let max_retries = options.max_retries;
        let pool = GrpcConnectionPool::new(transport_options);
        Self {
            pool,
            retry_delay,
            max_retries,
        }
    }
}

impl ValidatorNodeProvider for GrpcNodeProvider {
    type Node = GrpcClient;

    fn make_node(&self, address: &str) -> Result<Self::Node, NodeError> {
        let network = ValidatorPublicNetworkConfig::from_str(address).map_err(|_| {
            NodeError::CannotResolveValidatorAddress {
                address: address.to_string(),
            }
        })?;
        let http_address = network.http_address();
        let channel =
            self.pool
                .channel(http_address.clone())
                .map_err(|error| NodeError::GrpcError {
                    error: format!("error creating channel: {}", error),
                })?;

        Ok(GrpcClient::new(
            http_address,
            channel,
            self.retry_delay,
            self.max_retries,
        ))
    }
}