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use crate::{AlertMessage, EpochNumberWithFraction, Timestamp};
use ckb_types::U256;
use serde::{Deserialize, Serialize};

/// Chain information.
#[derive(Deserialize, Serialize, Debug)]
pub struct ChainInfo {
    /// The network name.
    ///
    /// Examples:
    ///
    /// * "ckb" - Lina the mainnet.
    /// * "ckb_testnet" - Aggron the testnet.
    pub chain: String,
    /// The median time of the last 37 blocks, including the tip block.
    pub median_time: Timestamp,
    /// The epoch information of tip block in the chain.
    pub epoch: EpochNumberWithFraction,
    /// Current difficulty.
    ///
    /// Decoded from the epoch `compact_target`.
    pub difficulty: U256,
    /// Whether the local node is in IBD, Initial Block Download.
    ///
    /// When a node starts and its chain tip timestamp is far behind the wall clock, it will enter
    /// the IBD until it catches up the synchronization.
    ///
    /// During IBD, the local node only synchronizes the chain with one selected remote node and
    /// stops responding the most P2P requests.
    pub is_initial_block_download: bool,
    /// Active alerts stored in the local node.
    pub alerts: Vec<AlertMessage>,
}