import React, { Component } from 'react';
import { connect } from 'react-redux';
import { login } from '../../redux/reducer';
import './LoginForm.css';
import { BrowserRouter as Router, Route } from "react-router-dom";

class LoginForm extends Component {

  constructor(props) {
    super(props);
    this.state = {};
    this.onSubmit = this.onSubmit.bind(this);
  }

  render() {
    let {username, password} = this.state;
    let {isLoginPending, isLoginSuccess, loginError} = this.props;
    return (
      <form name="loginForm" onSubmit={this.onSubmit}>
        <div className="form-group-collection">
          <div className="form-group">
            <label>Username/E-mail:</label>
            <input type="username" name="username" onChange={e => this.setState({username: e.target.value})} value={username}/>
          </div>

          <div className="form-group">
            <label>Password:</label>
            <input type="password" name="password" onChange={e => this.setState({password: e.target.value})} value={password}/>
          </div>
        </div>

        <input type="submit" value="Login" />

        <div className="message">
          { isLoginPending && <div>Please wait...</div> }
          { isLoginSuccess && <div>Success.
            <Router><Route exact path="/" component={Home}/></Router></div> }
          { loginError && <div>{loginError.message}</div> }
        </div>
      </form>
    )
  }

  onSubmit(e) {
    e.preventDefault();
    let { username, password } = this.state;
    this.props.login(username, password);
    this.setState({
      username: '',
      password: ''
    });
  }
}

const Home = () => (
  <div>
    <h2>Welcome Admin </h2>
  </div>
);

const mapStateToProps = (state) => {
  return {
    isLoginPending: state.isLoginPending,
    isLoginSuccess: state.isLoginSuccess,
    loginError: state.loginError
  };
}

const mapDispatchToProps = (dispatch) => {
  return {
    login: (username, password) => dispatch(login(username, password))
  };
}

export default connect(mapStateToProps, mapDispatchToProps)(LoginForm);

const SET_LOGIN_PENDING = 'SET_LOGIN_PENDING';
const SET_LOGIN_SUCCESS = 'SET_LOGIN_SUCCESS';
const SET_LOGIN_ERROR = 'SET_LOGIN_ERROR';

export function login(username, password) {
  return dispatch => {
    dispatch(setLoginPending(true));
    dispatch(setLoginSuccess(false));
    dispatch(setLoginError(null));

    callLoginApi(username, password, error => {
      dispatch(setLoginPending(false));
      if (!error) {
        dispatch(setLoginSuccess(true));
      } else {
        dispatch(setLoginError(error));
      }
    });
  }
}

function setLoginPending(isLoginPending) {
  return {
    type: SET_LOGIN_PENDING,
    isLoginPending
  };
}

function setLoginSuccess(isLoginSuccess) {
  return {
    type: SET_LOGIN_SUCCESS,
    isLoginSuccess
  };
}

function setLoginError(loginError) {
  return {
    type: SET_LOGIN_ERROR,
    loginError
  }
}

function callLoginApi(username, password, callback) {
  setTimeout(() => {
    if (username === 'admin' && password === 'password') {
      return callback(null);
    } else {
      return callback(new Error('Invalid username and password'));
    }
  }, 1000);
}

export default function reducer(state = {
  isLoginSuccess: false,
  isLoginPending: false,
  loginError: null
}, action) {
  switch (action.type) {
    case SET_LOGIN_PENDING:
      return Object.assign({}, state, {
        isLoginPending: action.isLoginPending
      });

    case SET_LOGIN_SUCCESS:
      return Object.assign({}, state, {
        isLoginSuccess: action.isLoginSuccess
      });

    case SET_LOGIN_ERROR:
      return Object.assign({}, state, {
        loginError: action.loginError
      });

    default:
      return state;
  }
}

import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import logger from 'redux-logger';
import reducer from './reducer';

const store = createStore(reducer, {}, applyMiddleware(thunk, logger));
export default store;