// 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 std_arbitrum_tokens = {}
const tokens = {
    42161: std_arbitrum_tokens,
    31337: std_arbitrum_tokens,
    53261: {},
}

export function erc20(chainId, addr, provider=null) {
    return new ethers.Contract(addr, erc20Abi, 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)
            // console.log('addr', addr)
            const token = erc20(chainId, addr)
            const symbol = await token.symbol()
            // console.log('symbol', symbol)
            const decimals = Number(await token.decimals())
            result = {name: null, symbol, decimals, address: addr}
            chainTokens[addr] = result
        }
        return result
    } catch {
        return null
    }
}