import React, { Component } from 'react'
// import { Link } from 'react-router-dom'
import { connect } from 'react-redux'

import actions from 'app/actions'

import Annotations from 'app/views/editor/align/containers/annotations.container'
import Waveform from 'app/views/editor/align/components/timeline/waveform.component'
import Ticks from 'app/views/editor/align/components/timeline/ticks.component'
import Cursor from 'app/views/editor/align/components/timeline/cursor.component'
import PlayCursor from 'app/views/editor/align/components/timeline/playCursor.component'
import CursorRegion from 'app/views/editor/align/components/timeline/cursorRegion.component'

import { WAVEFORM_SIZE, ZOOM_STEPS, INNER_HEIGHT } from 'app/constants'
import { clamp } from 'app/utils'
import { positionToTime } from 'app/utils/align.utils'

class Timeline extends Component {
  state = {
    dragging: false,
    a_ts: -1,
  }
  constructor(props){
    super(props)
    this.handleKeydown = this.handleKeydown.bind(this)
    this.handleMouseMove = this.handleMouseMove.bind(this)
    this.handleWheel = this.handleWheel.bind(this)
    this.handleContainerClick = this.handleContainerClick.bind(this)
    this.handleTimelineMouseDown = this.handleTimelineMouseDown.bind(this)
    this.handleTimelineMouseUp = this.handleTimelineMouseUp.bind(this)
  }
  componentDidMount() {
    this.bind()
  }
  componentWillUnmount() {
    this.unbind()
  }
  shouldComponentUpdate(nextProps) {
    return (
      nextProps.timeline !== this.props.timeline ||
      nextProps.annotation !== this.props.annotation
    )
  }
  bind() {
    document.addEventListener('keydown', this.handleKeydown)
  }
  unbind() {
    document.removeEventListener('keydown', this.handleKeydown)
  }
  handleKeydown(e) {
    if (document.activeElement !== document.body) {
      return
    }
    console.log(e.keyCode)
    if (e.metaKey && this.props.selectedAnnotation.id) {
      const { selectedAnnotation } = this.props
      switch (e.keyCode) {
        case 38: // up
          e.preventDefault()
          selectedAnnotation.start_ts = Math.max(selectedAnnotation.start_ts - (e.shiftKey ? 1 : 0.1), 0)
          actions.align.updateSelectedAnnotation(selectedAnnotation)
          actions.audio.seek(selectedAnnotation.start_ts)
          actions.align.setCursor(selectedAnnotation.start_ts)
          break
        case 40: // down
          e.preventDefault()
          selectedAnnotation.start_ts += e.shiftKey ? 1 : 0.1
          actions.align.updateSelectedAnnotation(selectedAnnotation)
          actions.audio.seek(selectedAnnotation.start_ts)
          actions.align.setCursor(selectedAnnotation.start_ts)
          break
        case 68: // D
          e.preventDefault()
          actions.align.cloneSelectedAnnotation(selectedAnnotation)
      }
      return
    }
    if (e.shiftKey) {
      switch (e.keyCode) {
        case 187: // plus
          actions.align.setZoom(this.props.timeline.zoom - 1)
          break
        case 189: // minus
          actions.align.setZoom(this.props.timeline.zoom + 1)
          break
      }
    } else {
      // console.log(e.keyCode)
      switch (e.keyCode) {
        case 27: // escape
          actions.align.hideAnnotationForm()
          break
        case 65: // A - add
          e.preventDefault()
          actions.align.showNewAnnotationForm(this.props.audio.play_ts, this.props.text)
          break
        case 32: // spacebar
          actions.audio.toggle()
          break
        case 38: // up
          actions.audio.jump(- ZOOM_STEPS[this.props.timeline.zoom] * 0.1)
          break
        case 40: // down
          actions.audio.jump(ZOOM_STEPS[this.props.timeline.zoom] * 0.1)
          break
      }
    }
  }
  handleWheel(e) {
    let { start_ts, zoom, duration } = this.props.timeline
    let { deltaY } = e
    let secondsPerPixel = ZOOM_STEPS[zoom] * 0.1 // 0.1 sec / step
    let widthTimeDuration = INNER_HEIGHT * secondsPerPixel // secs per pixel
    start_ts += Math.round((deltaY) * ZOOM_STEPS[zoom])
    start_ts = clamp(start_ts, 0, Math.max(0, duration - widthTimeDuration / 2))
    if (e.shiftKey) {
      if (Math.abs(deltaY) < 2) return
      if (e.deltaY > 0) {
        actions.align.throttledSetZoom(this.props.timeline.zoom + 1)
      } else {
        actions.align.throttledSetZoom(this.props.timeline.zoom - 1)
      }
    } else if (e.altKey) {
      actions.audio.jump(e.deltaY * ZOOM_STEPS[zoom])
    } else {
      actions.align.setScrollPosition(start_ts)
    }
  }
  handleContainerClick(e) {
    actions.align.clearSelectedAnnotation()
    actions.align.clearSelectedParagraph()
  }
  handleTimelineMouseDown(e) {
    const cursor_ts = positionToTime(e.pageY, this.props.timeline)
    actions.align.clearCursorRegion()
    actions.align.setCursor(cursor_ts)
    this.setState({
      dragging: true,
      a_ts: cursor_ts,
    })
  }
  handleMouseMove(e) {
    const cursor_ts = positionToTime(e.pageY, this.props.timeline)
    if (this.state.dragging) {
      actions.align.setCursorRegion(
        Math.min(this.state.a_ts, cursor_ts),
        Math.max(this.state.a_ts, cursor_ts),
      )
    } else {
      actions.align.setCursor(cursor_ts)
    }
  }
  handleTimelineMouseUp(e) {
    this.setState({ dragging: false })
    const play_ts = positionToTime(e.pageY, this.props.timeline)
    if (e.metaKey) {
      actions.align.spliceTime(play_ts)
    } else if (e.pageX < WAVEFORM_SIZE * 0.67) {
      actions.audio.seek(play_ts)      
    } else {
      actions.align.showNewAnnotationForm(play_ts, this.props.text)
    }
  }
  render() {
    return (
      <div
        className='timeline'
        onClick={this.handleContainerClick}
        onWheel={this.handleWheel}
        onMouseMove={this.handleMouseMove}
      >
        <div className='timelineColumn'>
          <Waveform
            onMouseDown={this.handleTimelineMouseDown}
            onMouseUp={this.handleTimelineMouseUp}
          />
          <Ticks timeline={this.props.timeline} />
          <Cursor timeline={this.props.timeline} annotation={this.props.annotation} />
          <CursorRegion timeline={this.props.timeline} />
        </div>
        <Annotations timeline={this.props.timeline} />
        <PlayCursor />
      </div>
    )
  }
}

const mapStateToProps = state => ({
  timeline: state.align.timeline,
  annotation: state.align.annotation,
  selectedAnnotation: state.align.selectedAnnotation,
  audio: state.audio,
  text: state.site.text,
})

export default connect(mapStateToProps)(Timeline)