import React, { Component } from 'react'
import { Route } from 'react-router-dom'
import { bindActionCreators } from 'redux'
import { connect } from 'react-redux'

import { floatLT, floatLTE } from 'app/utils'
import actions from 'app/actions'
import ParagraphForm from '../components/paragraph.form'

const MEDIA_TYPES = new Set([
  'image', 'gallery', 'vitrine',
  'video',
])

class ParagraphList extends Component {
  state = {
    paragraphs: [],
    currentParagraph: -1,
    currentAnnotation: -1,
  }
  
  componentDidMount() {
    this.build()
  }

  componentDidUpdate(prevProps) {
    if (this.props.paragraph !== prevProps.paragraph) {
      this.build()
    }
    if (this.props.audio.play_ts === prevProps.audio.play_ts) return
    this.setCurrentParagraph()
  }

  setCurrentParagraph() {
    const { play_ts } = this.props.audio
    const insideParagraph = this.state.paragraphs.some(paragraph => {
      if (floatLTE(paragraph.start_ts, play_ts) && floatLT(play_ts, paragraph.end_ts)) {
        this.setCurrentAnnotation(paragraph, play_ts)
        return true
      }
      return false
    })
    if (!insideParagraph) {
      this.setState({
        currentParagraph: -1,
        currentAnnotation: -1,
      })
    }
  }

  setCurrentAnnotation(paragraph, play_ts) {
    const { id: currentParagraph, annotations } = paragraph
    let currentAnnotation
    let annotation
    let i = 0
    let len = annotations.length
    for (let i = 0; i < len - 1; i++) {
      if (floatLT(play_ts, annotations[i+1].start_ts)) {
        currentAnnotation = annotations[i].id
        break
      }
    }
    if (!currentAnnotation) {
      currentAnnotation = annotations[len-1].id
    }
    this.setState({ currentParagraph, currentAnnotation })
  }

  build() {
    const { order: annotationOrder, lookup: annotationLookup } = this.props.annotation
    const { lookup: paragraphLookup } = this.props.paragraph
    let currentParagraph = {}
    const paragraphs = []
    // loop over the annotations in time order
    annotationOrder.forEach((annotation_id, i) => {
      const annotation = annotationLookup[annotation_id]
      const paragraph = paragraphLookup[annotation.paragraph_id]
      // if this annotation is media, insert it after the current paragraph
      if (MEDIA_TYPES.has(annotation.type)) {
        paragraphs.push({
          id: ('index_' + i),
          type: annotation.type,
          start_ts: annotation.start_ts,
          end_ts: 0,
          annotations: [annotation],
        })
        return
      }
      // if this annotation is from a different paragraph, make a new paragraph
      if (annotation.paragraph_id !== currentParagraph.id) {
        const paragraph_type = getParagraphType(annotation, paragraph)
        currentParagraph = {
          id: annotation.paragraph_id || ('index_' + i),
          type: paragraph_type,
          start_ts: annotation.start_ts,
          end_ts: 0,
          annotations: [],
        }
        paragraphs.push(currentParagraph)
      }
      // if this annotation is a paragraph_end, set the end timestamp
      if (annotation.type === 'paragraph_end') {
        currentParagraph.end_ts = annotation.start_ts
      }
      // otherwise, just append this annotation to the paragraph
      else {
        currentParagraph.annotations.push(annotation)
      }
    })
    for (let i = 0; i < (paragraphs.length - 1); i++) {
      if (!paragraphs[i].end_ts) {
        paragraphs[i].end_ts = paragraphs[i+1].start_ts - 0.1
      }
    }
    this.setState({ paragraphs })
  }

  render() {
    const {
      media, paragraphElementLookup, selectedParagraph,
      onAnnotationClick, onParagraphDoubleClick
    } = this.props
    const { paragraphs, currentParagraph, currentAnnotation } = this.state
    return paragraphs.map(paragraph => {
      if (selectedParagraph && selectedParagraph.id === paragraph.id) {
        paragraph = selectedParagraph
      }
      if (paragraph.type in paragraphElementLookup) {
        const ParagraphElement = paragraphElementLookup[paragraph.type]
        return (
          <ParagraphElement
            key={paragraph.id}
            paragraph={paragraph}
            media={media}
            currentParagraph={paragraph.id === currentParagraph}
            currentAnnotation={paragraph.id === currentParagraph && currentAnnotation}
            onAnnotationClick={onAnnotationClick}
            onDoubleClick={onParagraphDoubleClick}
          />
        )
      } else {
        return <div key={paragraph.id}>{'(waiting to implement' + paragraph.type + ')'}</div>
      }
    })
  }
}

const getParagraphType = (annotation, paragraph) => {
  if (!paragraph) {
    return annotation.type
  }
  return paragraph.type
}

const mapStateToProps = state => ({
  paragraph: state.paragraph.index,
  annotation: state.annotation.index,
  audio: state.audio,
  media: state.media.index,
})

const mapDispatchToProps = dispatch => ({
})

export default connect(mapStateToProps, mapDispatchToProps)(ParagraphList)