// keeps a list of known tokens

// todo load standard known tokens

import {ethers} from "ethers";
import {getProvider} from "./blockchain.js";
import {newContract} from "./contract.js";

const std_arbitrum_tokens = {}
const tokens = {
    42161: std_arbitrum_tokens,
    31337: std_arbitrum_tokens,
    1337: {},
}

export async function erc20(chainId, addr, provider=null) {
    return await newContract(addr, 'IERC20Metadata', provider?provider:getProvider(chainId));
}

let _loggedNoTokensForChain = false
export async function lookupToken(chainId, address) {
    // console.log('lookupToken', chainId, address)
    const chainTokens = tokens[chainId]
    if( chainTokens === undefined ) {
        if( !_loggedNoTokensForChain ) {
            console.log('no tokens for chain', chainId)
            _loggedNoTokensForChain = true
        }
        return null
    }
    try {
        let result = chainTokens[address]
        // console.log('found', result)
        if (result === undefined) {
            // todo look in tokens project?
            const addr = ethers.getAddress(address)
            const token = await erc20(chainId, addr)
            let [name, symbol, decimals] = await Promise.all([token.name(), token.symbol(), token.decimals()])
            name = Number(name)
            decimals = Number(decimals)
            result = {a: addr, n: name, s:symbol, d:decimals}
            chainTokens[addr] = result
        }
        return result
    } catch {
        return null
    }
}