import {ethers} from "ethers";

const providers = {} // indexed by chain id

export function getProvider(chainId) {
    let result = providers[chainId]
    if( result === undefined ) {
        let rpc_url = process.env['DEXORDER_RPC_URL_'+chainId]
        if( rpc_url === undefined )
            throw Error(`WARNING: No provider found for chainId ${chainId}.  Using localhost.`)
        result = rpc_url.startsWith('ws') ?
            new ethers.WebSocketProvider(rpc_url, chainId) :
            new ethers.JsonRpcProvider(rpc_url, chainId)
        providers[chainId] = result
    }
    return result
}

const signers = {} // indexed by chain id


// todo multiple signers per chain, checked out of a pool
export function getSigner(chainId) {
    let signer = signers[chainId]
    if (signer === undefined) {
        const private_keys = process.env['DEXORDER_ACCOUNTS_' + chainId]
        if( !private_keys ) {
            console.log(`DEXORDER_ACCOUNTS_${chainId} not defined`)
            return null // todo fatal
        }
        // for (const match of private_keys.matchAll(/([^,]+),?/g))
        //     signer.push(new ethers.Wallet(match[1]))
        signer = new ethers.Wallet(private_keys, getProvider(chainId))
        signers[chainId] = signer
    }
    return signer
    // const result = signer[signerIndexes[chainId]]
    // signerIndexes[chainId]++
    // if( signerIndexes[chainId] >= signer.length )
    //     signerIndexes[chainId] = 0
    // return result
}