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

import actions from '../../../actions'
// import * as alignActions from '../align.actions'

import Waveform from './waveform.component'
import Ticks from './ticks.component'
import Cursor from './cursor.component'
import PlayButton from './playButton.component'
import PlayCursor from './playCursor.component'

import { ZOOM_STEPS } from '../constants'
import { clamp } from '../../../util'

class Timeline extends Component {
  constructor(props){
    super(props)
    this.handleKeydown = this.handleKeydown.bind(this)
    this.handleMouseMove = this.handleMouseMove.bind(this)
    this.handleWheel = this.handleWheel.bind(this)
    this.handleClick = this.handleClick.bind(this)
  }
  componentDidMount() {
    this.bind()
  }
  componentWillUnmount() {
    this.unbind()
  }
  bind() {
    document.addEventListener('keydown', this.handleKeydown)
  }
  unbind() {
    document.removeEventListener('keydown', this.handleKeydown)
  }
  handleKeydown(e) {
    if (document.activeElement !== document.body) {
      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 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 secondsPerPixel = ZOOM_STEPS[zoom] * 0.1 // 0.1 sec / step
    let widthTimeDuration = window.innerHeight * secondsPerPixel // secs per pixel

    start_ts = clamp(start_ts + e.deltaY * ZOOM_STEPS[zoom], 0, Math.max(0, duration - widthTimeDuration / 2))
    if (e.shiftKey) {
      if (Math.abs(e.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.seek(start_ts)
    } else {
      actions.align.setScrollPosition(start_ts)
    }
  }
  handleMouseMove(e) {
    const cursor_ts = positionToTime(e.pageY, this.props.timeline)
    actions.align.setCursor(cursor_ts)
  }
  handleClick(e) {
    const play_ts = positionToTime(e.pageY, this.props.timeline)
    actions.audio.seek(play_ts)
  }
  render() {
    return (
      <div
        className='timeline'
        onWheel={this.handleWheel}
        onMouseMove={this.handleMouseMove}
      >
        <Waveform onClick={this.handleClick} />
        <Ticks timeline={this.props.timeline} />
        <Cursor timeline={this.props.timeline} />
        <PlayCursor />
        <PlayButton />
      </div>
    )
  }
}

const positionToTime = (y, { start_ts, zoom, duration }) => {
  const secondsPerPixel = ZOOM_STEPS[zoom] * 0.1
  const widthTimeDuration = window.innerHeight * secondsPerPixel

  const timeMin = start_ts
  const timeMax = Math.min(start_ts + widthTimeDuration, duration)
  const timeWidth = timeMax - timeMin

  return clamp(y * secondsPerPixel + start_ts, 0, timeMax)
}

const mapStateToProps = state => ({
  timeline: state.align.timeline,
})

const mapDispatchToProps = dispatch => ({
  // alignActions: bindActionCreators({ ...alignActions }, dispatch),
})

export default connect(mapStateToProps, mapDispatchToProps)(Timeline)