import { store, history, dispatch } from 'app/store'
import {
  TEXT_ANNOTATION_TYPES,
  MEDIA_ANNOTATION_TYPES,
  UTILITY_ANNOTATION_TYPES,
} from 'app/constants'

export const buildParagraphs = annotationOrder => {
  const state = store.getState()
  const { lookup: annotationLookup } = state.annotation.index
  const { lookup: paragraphLookup } = state.paragraph.index
  let currentParagraph = {}
  let sectionCount = 0
  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 a utility (curtain, gallery instructions), then skip it
    if (UTILITY_ANNOTATION_TYPES.has(annotation.type)) {
      return
    }
    // if this annotation is media, then insert it after the current paragraph
    if (MEDIA_ANNOTATION_TYPES.has(annotation.type)) {
      // add option to hide the citation from the transcript
      if (!annotation.settings.hideCitation) {
        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.type === 'section_heading' || annotation.type === 'heading_text' || 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: [],
      }
      if (annotation.type === 'section_heading') {
        currentParagraph.sectionIndex = sectionCount++
        currentParagraph.id = 'section_' + currentParagraph.sectionIndex
      }
      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)
    }
  })
  // finally, go over the paragraphs and update their end_ts, if none is set
  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
    }
  }
  return paragraphs
}

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