use reth_chainspec::{ChainSpec, DEV, HOLESKY, MAINNET, SEPOLIA};
use reth_cli::chainspec::{parse_genesis, ChainSpecParser};
use std::sync::Arc;

/// Chains supported by reth. First value should be used as the default.
pub const SUPPORTED_CHAINS: &[&str] = &["mainnet", "sepolia", "holesky", "dev"];

/// Clap value parser for [`ChainSpec`]s.
///
/// The value parser matches either a known chain, the path
/// to a json file, or a json formatted string in-memory. The json needs to be a Genesis struct.
pub fn chain_value_parser(s: &str) -> eyre::Result<Arc<ChainSpec>, eyre::Error> {
    Ok(match s {
        "mainnet" => MAINNET.clone(),
        "sepolia" => SEPOLIA.clone(),
        "holesky" => HOLESKY.clone(),
        "dev" => DEV.clone(),
        _ => Arc::new(parse_genesis(s)?.into()),
    })
}

/// Ethereum chain specification parser.
#[derive(Debug, Clone, Default)]
#[non_exhaustive]
pub struct EthereumChainSpecParser;

impl ChainSpecParser for EthereumChainSpecParser {
    type ChainSpec = ChainSpec;

    const SUPPORTED_CHAINS: &'static [&'static str] = SUPPORTED_CHAINS;

    fn parse(s: &str) -> eyre::Result<Arc<ChainSpec>> {
        chain_value_parser(s)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use reth_chainspec::EthereumHardforks;

    #[test]
    fn parse_known_chain_spec() {
        for &chain in EthereumChainSpecParser::SUPPORTED_CHAINS {
            assert!(<EthereumChainSpecParser as ChainSpecParser>::parse(chain).is_ok());
        }
    }

    #[test]
    fn parse_raw_chainspec_hardforks() {
        let s = r#"{
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "uncleHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "stateRoot": "0x76f118cb05a8bc558388df9e3b4ad66ae1f17ef656e5308cb8f600717251b509",
  "transactionsTrie": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  "receiptTrie": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  "bloom": "0x000...000",
  "difficulty": "0x00",
  "number": "0x00",
  "gasLimit": "0x016345785d8a0000",
  "gasUsed": "0x00",
  "timestamp": "0x01",
  "extraData": "0x00",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "nonce": "0x0000000000000000",
  "baseFeePerGas": "0x07",
  "withdrawalsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  "blobGasUsed": "0x00",
  "excessBlobGas": "0x00",
  "parentBeaconBlockRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "requestsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
  "hash": "0xc20e1a771553139cdc77e6c3d5f64a7165d972d327eee9632c9c7d0fe839ded4",
  "alloc": {},
  "config": {
    "ethash": {},
    "chainId": 1,
    "homesteadBlock": 0,
    "daoForkSupport": true,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "terminalTotalDifficulty": 0,
    "shanghaiTime": 0,
    "cancunTime": 0,
    "pragueTime": 0
  }
}"#;

        let spec = <EthereumChainSpecParser as ChainSpecParser>::parse(s).unwrap();
        assert!(spec.is_shanghai_active_at_timestamp(0));
        assert!(spec.is_cancun_active_at_timestamp(0));
        assert!(spec.is_prague_active_at_timestamp(0));
    }
}