import React, { Component } from 'react';
import './App.css';
import Customer from './components/Customer';
import Paper from '@material-ui/core/Paper';
import Table from '@material-ui/core/Table';
import TableHead from '@material-ui/core/TableHead';
import TableBody from '@material-ui/core/TableBody';
import TableRow from '@material-ui/core/TableRow';
import TableCell from '@material-ui/core/TableCell';
import { withStyles } from '@material-ui/core/styles';
import CircularProgress from '@material-ui/core/CircularProgress';

const styles = theme => ({
  root: {
    width: '100%',
    marginTop: theme.spacing.unit*3,
    overflowX: "auto"
  },
  table: {
    minWidth: 1080
  },
  progress: {
    margine: theme.spacing.unit*2
  }
})

class App extends Component {
  state = {
    customers: "",
    completed: 0
  }

  //모든 컴포넌트 준비 완료일 때 실행 -- react가 라이브러리이기 때문 !
  componentDidMount() {
    this.timer = setInterval(this.progress,20);
    this.callApi()
    .then(res => this.setState({customers: res}))
    .catch(err => console.log(err));
  }

  callApi = async() => {
    //local의/api/customers에 접속해 response로 받아오고 이를 body변수에 담아주겠다
    const response = await fetch('/api/customers');
    const body = await response.json();
    return body;
  }

  progress = () => {
    const { completed } = this.state;
    this.setState({completed : completed >=100 ? 0: completed +1});
  }

  render() {
    const { classes } = this.props;
    return (
      <Paper className = {classes.root}>
        <Table className = {classes.table}>
          <TableHead>
            <TableRow>
              <TableCell>번호</TableCell>
              <TableCell>이미지</TableCell>
              <TableCell>이름</TableCell>
              <TableCell>생년월일</TableCell>
              <TableCell>성별</TableCell>
              <TableCell>직업</TableCell>
            </TableRow>
          </TableHead>

          <TableBody>
            {this.state.customers ? this.state.customers.map (c=> {
              return (<Customer key={c.id} id={c.id} image={c.image} name={c.name} birthday={c.birthday} gender={c.gender} job={c.job} />)
            }) :
            <TableRow>
              <TableCell colSpan="6" align="center">
                <CircularProgress className={classes.progress} varient="determinate" value={this.state.completed}/>
              </TableCell>
            </TableRow>
            }
          </TableBody>
        </Table>
      </Paper>
    );
  }
}

export default withStyles(styles)(App);