import { PureComponent } from 'react';

import { nth, convertTimezone } from '../../../modules/helpers/date';
import EventBus from '../../../modules/helpers/eventbus';

import './greeting.scss';

export default class Greeting extends PureComponent {
  constructor() {
    super();
    this.state = {
      greeting: ''
    };
    this.timer = undefined;
    this.language = window.language.widgets.greeting;
  }

  doEvents(time, message) {
    if (localStorage.getItem('events') === 'false') {
      return message;
    }

    // Get current month & day
    const month = time.getMonth();
    const date = time.getDate();

    // If it's December 25th, set the greeting string to "Merry Christmas"
    if (month === 11 && date === 25) {
      message = this.language.christmas;
    // If the date is January 1st, set the greeting string to "Happy new year"
    } else if (month === 0 && date === 1) {
      message = this.language.newyear;
    // If it's October 31st, set the greeting string to "Happy Halloween"
    } else if (month === 9 && date === 31) {
      message = this.language.halloween;
    }

    return message;
  }

  calculateAge(date) {
    const diff = Date.now() - date.getTime();
    const birthday = new Date(diff);
    return Math.abs(birthday.getUTCFullYear() - 1970);
  }

  getGreeting(time = (60000 - Date.now() % 60000)) {
    this.timer = setTimeout(() => {
      let now = new Date();
      const timezone = localStorage.getItem('timezone');
      if (timezone && timezone !== 'auto') {
        now = convertTimezone(now, timezone);
      }

      const hour = now.getHours();

      // Set the default greeting string to "Good evening"
      let message = this.language.evening;
      // If it's before 12am, set the greeting string to "Good morning"
      if (hour < 12) {
        message = this.language.morning;
      // If it's before 6pm, set the greeting string to "Good afternoon"
      } else if (hour < 18) {
        message = this.language.afternoon;
      }

      // Events and custom
      const custom = localStorage.getItem('defaultGreetingMessage');
      if (custom === 'false') {
        message = '';
      } else {
        message = this.doEvents(now, message);
      }

      // Name
      let name = '';
      const data = localStorage.getItem('greetingName');

      if (typeof data === 'string') {
        if (data.replace(/\s/g, '').length > 0) {
          name = `, ${data.trim()}`;
        }
      }

      const birthday = localStorage.getItem('birthdayenabled');

      if (custom === 'false' && birthday !== 'true') {
        name = name.replace(',', '');
      }

      // Birthday
      if (birthday === 'true') {
        const birth = new Date(localStorage.getItem('birthday'));

        if (birth.getDate() === now.getDate() && birth.getMonth() === now.getMonth()) {
          if (localStorage.getItem('birthdayage') === 'true') {
            const text = this.language.birthday.split(' ');
            message = `${text[0]} ${nth(this.calculateAge(birth))} ${text[1]}`;
          } else {
            message = this.language.birthday;
          }
        }
      }

      // Set the state to the greeting string
      this.setState({
        greeting: `${message}${name}`
      });
  
      this.getGreeting();
    }, time);
  }

  componentDidMount() {
    EventBus.on('refresh', (data) => {
      if (data === 'greeting' || data === 'timezone') {
        const element = document.querySelector('.greeting');

        if (localStorage.getItem('greeting') === 'false') {
          return element.style.display = 'none';
        }

        this.timer = null;
        this.getGreeting(0);

        element.style.display = 'block';
        element.style.fontSize = `${1.6 * Number((localStorage.getItem('zoomGreeting') || 100) / 100)}em`;
      }
    });

    // this comment can apply to all widget zoom features apart from the general one in the Accessibility section
    // in a nutshell: 1.6 is the current font size and we do "localstorage || 100" so we don't have to try that 4.0 -> 5.0 thing again
    document.querySelector('.greeting').style.fontSize = `${1.6 * Number((localStorage.getItem('zoomGreeting') || 100) / 100)}em`;

    this.getGreeting(0);
  }

  componentWillUnmount() {
    EventBus.off('refresh');
  }

  render() {
    return <h1 className='greeting'>
      {this.state.greeting}
    </h1>;
  }
}
