// keeps a list of known tokens

// todo load standard known tokens

import {ethers} from "ethers";
import {erc20Abi} from "./abi.js";
import {getProvider} from "./blockchain.js";

const tokens = {
    42161: {}
}

export async function lookupToken(chainId, address) {
    console.log('lookupToken', chainId, address)
    const chainTokens = tokens[chainId]
    if( chainTokens === undefined )
        return null
    try {
        let result = chainTokens[address]
        console.log('found', result)
        if (result === undefined) {
            // todo look in tokens project
            const addr = ethers.getAddress(address)
            console.log('addr', addr)
            const token = new ethers.Contract(addr, erc20Abi, getProvider(chainId))
            const symbol = await token.symbol()
            console.log('symbol', symbol)
            const decimals = Number(await token.decimals())
            result = {name: `${symbol} (${addr})`, symbol, decimals, address: addr}
            chainTokens[addr] = result
            return result
        }
    } catch {
        return null
    }
}