use bytes::Bytes;
use ethers::{
    abi::AbiDecode,
    types::{Address, H256, U256},
};
use eyre::Report;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum ExecutionError {
    #[error("invalid account proof for address: {0}")]
    InvalidAccountProof(Address),
    #[error("invalid storage proof for address: {0}, slot: {1}")]
    InvalidStorageProof(Address, H256),
    #[error("code hash mismatch for address: {0}, found: {1}, expected: {2}")]
    CodeHashMismatch(Address, String, String),
    #[error("receipt root mismatch for tx: {0}")]
    ReceiptRootMismatch(String),
    #[error("missing transaction for tx: {0}")]
    MissingTransaction(String),
    #[error("could not prove receipt for tx: {0}")]
    NoReceiptForTransaction(String),
    #[error("missing log for transaction: {0}, index: {1}")]
    MissingLog(String, U256),
    #[error("too many logs to prove: {0}, current limit is: {1}")]
    TooManyLogsToProve(usize, usize),
    #[error("execution rpc is for the incorect network")]
    IncorrectRpcNetwork(),
    #[error("Invalid base gas fee helios {0} vs rpc endpoint {1} at block {2}")]
    InvalidBaseGaseFee(U256, U256, u64),
    #[error("Invalid gas used ratio of helios {0} vs rpc endpoint {1} at block {2}")]
    InvalidGasUsedRatio(f64, f64, u64),
    #[error("Block {0} not found")]
    BlockNotFoundError(u64),
    #[error("Helios Execution Payload is empty")]
    EmptyExecutionPayload(),
    #[error("User query for block {0} but helios oldest block is {1}")]
    InvalidBlockRange(u64, u64),
}

/// Errors that can occur during evm.rs calls
#[derive(Debug, Error)]
pub enum EvmError {
    #[error("execution reverted: {0:?}")]
    Revert(Option<Bytes>),

    #[error("evm error: {0:?}")]
    Generic(String),

    #[error("evm execution failed: {0:?}")]
    Revm(revm::Return),

    #[error("rpc error: {0:?}")]
    RpcError(Report),
}

impl EvmError {
    pub fn decode_revert_reason(data: impl AsRef<[u8]>) -> Option<String> {
        let data = data.as_ref();

        // skip function selector
        if data.len() < 4 {
            return None;
        }
        String::decode(&data[4..]).ok()
    }
}