import React from "react";

import {makeStyles} from '@material-ui/core/styles';

import Button from '@material-ui/core/Button';
import ClickAwayListener from '@material-ui/core/ClickAwayListener';
import Grow from '@material-ui/core/Grow';
import Paper from '@material-ui/core/Paper';
import Popper from '@material-ui/core/Popper';
import MenuItem from '@material-ui/core/MenuItem';
import MenuList from '@material-ui/core/MenuList';
import ListItemText from "@material-ui/core/ListItemText";
import PersonIcon from "@material-ui/icons/Person";

import { useEtherBalance, useTokenBalance, useEthers } from '@usedapp/core'
import { formatEther } from '@ethersproject/units'



const useStyles = makeStyles((theme) => ({
    buttons: {
        margin: theme.spacing(1),
        padding: theme.spacing(1),
    },
    profile: {
        margin: theme.spacing(1),
        padding: theme.spacing(1),
    }
}));

const BBG = '0x3Afe98235d680e8d7A52e1458a59D60f45F935C0'

export default function ConnectWallet() {


    
    const classes = useStyles();
    
    const { activateBrowserWallet, account } = useEthers()
    const etherBalance = useEtherBalance(account)
    const tokenBalance = useTokenBalance(BBG, account)

    const [open, setOpen] = React.useState(false);
    const anchorRef = React.useRef(null);
  
    const handleToggle = () => {
      setOpen((prevOpen) => !prevOpen);
    };
  
    const handleClose = (event) => {
      if (anchorRef.current && anchorRef.current.contains(event.target)) {
        return;
      }
  
      setOpen(false);
    };
  
    function handleListKeyDown(event) {
      if (event.key === 'Tab') {
        event.preventDefault();
        setOpen(false);
      } else if (event.key === 'Escape') {
        setOpen(false);
      }
    }
  
    // return focus to the button when we transitioned from !open -> open
    const prevOpen = React.useRef(open);
    React.useEffect(() => {
      if (prevOpen.current === true && open === false) {
        anchorRef.current.focus();
      }
  
      prevOpen.current = open;
    }, [open]);

    return (
      <>
        {account?
        (<>
        <Button
          ref={anchorRef}
          id="composition-button"
          aria-controls={open ? 'composition-menu' : undefined}
          aria-expanded={open ? 'true' : undefined}
          aria-haspopup="true"
          onClick={handleToggle}
        >
            <PersonIcon/>
            <ListItemText primary="Profile"/>
        </Button>
        <Popper
          open={open}
          anchorEl={anchorRef.current}
          role={undefined}
          placement="bottom-start"
          transition
          disablePortal
        >
          {({ TransitionProps, placement }) => (
            <Grow
              {...TransitionProps}
              style={{
                transformOrigin:
                  placement === 'bottom-start' ? 'left top' : 'left bottom',
              }}
            >
              <Paper>
                <ClickAwayListener onClickAway={handleClose}>
                  <MenuList
                    autoFocusItem={open}
                    id="composition-menu"
                    aria-labelledby="composition-button"
                    onKeyDown={handleListKeyDown}
                  >
                    <MenuItem onClick={handleClose}>{account && <p>Account: {account}</p>}</MenuItem>
                    <MenuItem onClick={handleClose}>{etherBalance && <a>ETH Balance: {formatEther(etherBalance)}</a>}</MenuItem>
                    <MenuItem onClick={handleClose}>{tokenBalance && <a>BBG Balance: {formatEther(tokenBalance)}</a>}</MenuItem>
                  </MenuList>
                </ClickAwayListener>
              </Paper>
            </Grow>
          )}
        </Popper>
        </>):(<div>
          <button onClick={() => activateBrowserWallet()} className={classes.buttons}>Connect Wallet</button>
        </div>)}
      </>
    )

}