import { h, Component } from 'preact'
import { isMobile } from '../util'
import db from '../db'
import { Lethargy } from 'lethargy'

export default class App extends Component {
  constructor() {
    super()
    this.state = {
      index: 0,
      data: db.backupDB,
    }
    this.lastScroll = Date.now()
    this.onScroll = this.onScroll.bind(this)
    this.lethargy = new Lethargy(8, 100, 1.1, 1000)
    db.fetch( data => {
      document.body.parentNode.classList.remove('loading')
      this.setState({ data }) 
    })
//     document.body.addEventListener('mousewheel', this.onScroll)
//     document.body.addEventListener('DOMMouseScroll', this.onScroll)
    document.body.addEventListener('wheel', this.onScroll)
  }
  onScroll(e) {
    e.preventDefault()
    e.stopPropagation()
    const scrollDirection = this.lethargy.check(e)
    const now = Date.now()
    if (scrollDirection !== false && now - this.lastScroll > 500) {
      this.lastScroll = now
      const cellCount = this.state.data.painting.length
      const index = (this.state.index + cellCount - scrollDirection) % cellCount
      this.setState({ index })
    }
  }
  render() {
    const paintings = this.state.data.painting.map( (painting, i) => {
      return (
        <div class='cell' key={i}>
          <div class='painting'>
            <div class='image' style={'background-image: url(' + painting.image.uri + ')'} />
          </div>
          <div class='about'>
            {painting.title}<br/>
            {painting.medium}<br/>
            {painting.date}<br/>
            {painting.image.caption}<br/>
          </div>
        </div>
      )
    })
    const about = this.state.data.page[0]
    const body = (about.body || '').replace(/\n/g,'<br>')
    const page = (
      <div class='cell'>
        <div class='painting'>
          <div class='image' style={'background-image: url(' + about.image.uri + ')'} />
        </div>
        <div class='about' dangerouslySetInnerHTML={{ __html: body }}>
        </div>
      </div>
    )
    const scrollPercentage = this.state.index * -100
    return (
      <div>
        <div class='header'>Procedural Paintings by Pepper</div>
        <div class='scroller'
             style={'transform:translateY(' + scrollPercentage + 'vh)'}
        >
          {paintings}
          {page}
        </div>
      </div>
    )
  }
}
