import {ethers} from "ethers";

const providers = {} // indexed by chain id


export function getProvider(chainId) {
    let result = providers[chainId]
    if( result === undefined ) {
        const rpc_url = process.env['DEXORDER_RPC_URL_'+chainId]
        if( rpc_url === undefined ) {
            console.error('No provider found for chainId',chainId)
            return null
        }
        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, value is an array to be used in round-robin fashion
const signerIndexes = {}


export function signer(chainId) {
    let chainSigners = signers[chainId]
    if (chainSigners === undefined) {
        chainSigners = []
        const private_keys = process.env['DEXORDER_ACCOUNTS_' + chainId]
        for (const match of private_keys.matchAll(/([^,]+),?/g))
            chainSigners.push(new ethers.Wallet(match[1]))
        signers[chainId] = chainSigners
        signerIndexes[chainId] = 0
    }
    const result = chainSigners[signerIndexes[chainId]]
    signerIndexes[chainId]++
    if( signerIndexes[chainId] >= chainSigners.length )
        signerIndexes[chainId] = 0
    return result
}