import React, { Component } from 'react';
import {
  ScrollView,
  StyleSheet,
  TouchableOpacity,
  Image,
  View,
  RefreshControl,
} from 'react-native';

import HTMLView from 'react-native-htmlview'
import htmlStyles from '../components/htmlStyles'

import ClearText from '../components/text'
import Heading from '../components/heading'
import Definition from '../components/definition'
import Close from '../components/close'

export default class TimelineFull extends Component {
  constructor() {
    super()
    this.onRefresh = this.onRefresh.bind(this)
    this.onPickTag = this.onPickTag.bind(this)
  }
  onRefresh() {
    this.props.onClose()
  }
  onPickTag(tag) {
    this.props.onFilter(tag)
  }
  render() {
    const item = this.props.item
    let image, links;
    if (! item) {
      return ( <View></View> )
    }
    
    if (item.image) {
      const caption = item.credit ? (
        <ClearText style={styles.caption}>{item.credit}</ClearText>
      ) : (
        <View></View>
      )
      const originalWidth = Number(item.image.width)
      const originalHeight = Number(item.image.height)
      const height = originalHeight > 450 ? 450 : originalHeight
      const width = originalWidth * height / originalHeight
      image = (
        <View style={styles.imageContainer}>
          <View style={styles.imageWrapper}>
            <img src={item.image.uri}
              style={[styles.image, {
                width: width,
                height: height,
              }]} />
          </View>
          {caption}
        </View>
      )
    } else {
      image = ( <View></View> )
    }
    
    if (item.links.length) {
      const linkItems = item.links.map((link, i) => {
        const url = link.uri
        let name = link.text
        if (! name || name.match(/Link Text/i)) {
          name = linkTextFromUrl(url)
        }
        return (
          <TouchableOpacity key={'link_' + i} onPress={() => this.props.onLinkPress(url)}>
            <ClearText style={styles.link}>{name}</ClearText>
          </TouchableOpacity>
        )
      })
      links = (
        <Definition label='Links' contentIsView={true}>{linkItems}</Definition>
      )
    }
    
    const tags = item.keywords.map((tag, i) => {
      return `<a href='${tag}'>${tag}</a>`
    }).join(', ')
    
    const description = '<p>' + item.description + '</p>'

    return (
      <View style={styles.container}>
        <ScrollView
          contentContainerStyle={styles.item}
          horizontal={false}
          showsHorizontalScrollIndicator={false}
        >
          {image}
          <Heading style={styles.title}>{item.title}</Heading>
          <View style={styles.contentContainer}>
            <View style={styles.bodyContainer}>
              <HTMLView value={description} style={styles.description} stylesheet={htmlStyles} onLinkPress={this.props.onLinkPress} />
            </View>
            <View style={styles.metadataContainer}>
              <Definition label='Date'>{item.date}</Definition>
              <Definition label='Medium'>{item.medium}</Definition>
              <Definition label='Category' contentIsView={true}>
                <TouchableOpacity onPress={() => this.onPickTag(item.category)}>
                  <ClearText style={styles.link}>{item.category}</ClearText>
                </TouchableOpacity>
              </Definition>
              <Definition label='Tags' contentIsView={true}>
                <HTMLView value={'<p>' + tags + '</p>'} stylesheet={tagHTMLStyles} onLinkPress={this.onPickTag} />
              </Definition>
              {links}
            </View>
          </View>
        </ScrollView>
        <Close onPress={this.props.onClose} />
      </View>
    )
  }
}


function linkTextFromUrl (url) {
  const url_parts = url.split('/')
  const domain = url_parts[2]
  const terms = domain.split('.')
  const len = terms.length
  let term = (len > 2 && terms[len-1].length == 2) ? terms[len-3] : terms[len-2]
  if (term == 'wikipedia') {
    term += url_parts[4].replace(/\#.*/,'').replace('_', ' ')
  }
  return capitalize(term)
}
function capitalize (s){
  return s.charAt(0).toUpperCase() + s.slice(1)
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  scrollView: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
    backgroundColor: 'black',
  },
  item: {
    maxWidth: 1000,
    padding: 40,
  },
  imageContainer: {
    width: '100%',
    marginBottom: 10,
    alignItems: 'center',
  },
  imageWrapper: {
    width: '100%',
    marginBottom: 5,
    alignItems: 'center',
  },
  caption: {
    fontSize: 12,
  },

  bodyContainer: {
    left: '0%',
    width: '60%',
    paddingRight: 50,
  },
  metadataContainer: {
    position: 'absolute',
    left: '60%',
    width: '40%',
  },
  title: {
    textAlign: 'left',
    fontWeight: 'bold',
    fontSize: 18,
  },
  date: {
    textAlign: 'left',
  },
  description: {
    flex: 1,
    flexDirection: 'column',
  },
  link: {
    textDecorationLine: 'underline',
    textAlign: 'left',
  },
  tag: {
    marginRight: 5,
  },
})

const tagHTMLStyles = StyleSheet.create({
  p: {
    color: 'white',  
    fontFamily: 'Futura-Medium',
    textAlign: 'justify',
    fontSize: 16,
    lineHeight: 30,
  },
  b: {
    fontFamily: 'Futura-MediumItalic',
    color: 'white',
    fontSize: 16,
    lineHeight: 30,
  },
  i: {
    fontFamily: 'Futura-MediumItalic',
    color: 'white',
    fontSize: 16,
    lineHeight: 30,
  },
  a: {
    color: 'white',
    fontFamily: 'Futura-Medium',
    textDecorationLine: 'underline',
    fontSize: 16,
    lineHeight: 30,
  },
})