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use borsh::{BorshDeserialize, BorshSerialize};
use serde::{Deserialize, Serialize};
use sov_modules_api::{transaction::Transaction, Context, Hasher, Spec};
use std::io::Cursor;
use tracing::debug;
/// RawTx represents a serialized rollup transaction received from the DA.
#[derive(Debug, PartialEq, Clone, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
pub struct RawTx {
    pub data: Vec<u8>,
}

impl RawTx {
    fn hash<C: Context>(&self) -> [u8; 32] {
        <C as Spec>::Hasher::hash(&self.data)
    }
}

type RawTxHash = [u8; 32];

pub fn verify_txs_stateless<C: Context>(
    raw_txs: Vec<RawTx>,
) -> anyhow::Result<Vec<(Transaction<C>, RawTxHash)>> {
    let mut txs = Vec::with_capacity(raw_txs.len());
    debug!("Verifying {} transactions", raw_txs.len());
    for raw_tx in raw_txs {
        let raw_tx_hash = raw_tx.hash::<C>();
        let mut data = Cursor::new(&raw_tx.data);
        let tx = Transaction::<C>::deserialize_reader(&mut data)?;
        tx.verify()?;
        txs.push((tx, raw_tx_hash));
    }
    Ok(txs)
}