import React from 'react'
import PropTypes from 'prop-types'
import data from '../data'

import { getData, getSanitizedData, unifiedToNative } from '../utils'

const SHEET_COLUMNS = 52

const _getPosition = (props) => {
  var { sheet_x, sheet_y } = _getData(props),
    multiply = 100 / (SHEET_COLUMNS - 1)

  return `${multiply * sheet_x}% ${multiply * sheet_y}%`
}

const _getData = (props) => {
  var { emoji, skin, set } = props
  return getData(emoji, skin, set)
}

const _getSanitizedData = (props) => {
  var { emoji, skin, set } = props
  return getSanitizedData(emoji, skin, set)
}

const _handleClick = (e, props) => {
  if (!props.onClick) {
    return
  }
  var { onClick } = props,
    emoji = _getSanitizedData(props)

  onClick(emoji, e)
}

const _handleOver = (e, props) => {
  if (!props.onOver) {
    return
  }
  var { onOver } = props,
    emoji = _getSanitizedData(props)

  onOver(emoji, e)
}

const _handleLeave = (e, props) => {
  if (!props.onLeave) {
    return
  }
  var { onLeave } = props,
    emoji = _getSanitizedData(props)

  onLeave(emoji, e)
}

const _isNumeric = (value) => {
  return !isNaN(value - parseFloat(value))
}

const _convertStyleToCSS = (style) => {
  let div = document.createElement('div')

  for (let key in style) {
    let value = style[key]

    if (_isNumeric(value)) {
      value += 'px'
    }

    div.style[key] = value
  }

  return div.getAttribute('style')
}

const Emoji = (props) => {
  for (let k in Emoji.defaultProps) {
    if (props[k] == undefined && Emoji.defaultProps[k] != undefined) {
      props[k] = Emoji.defaultProps[k]
    }
  }

  let data = _getData(props)
  if (!data) {
    return null
  }

  let { unified, custom, short_names, imageUrl } = data,
    style = {},
    children = props.children,
    className = 'emoji-mart-emoji',
    title = null

  if (!unified && !custom) {
    return null
  }

  if (props.tooltip) {
    title = short_names[0]
  }

  if (props.native && unified) {
    className += ' emoji-mart-emoji-native'
    style = { fontSize: props.size }
    children = unifiedToNative(unified)

    if (props.forceSize) {
      style.display = 'inline-block'
      style.width = props.size
      style.height = props.size
    }
  } else if (custom) {
    className += ' emoji-mart-emoji-custom'
    style = {
      width: props.size,
      height: props.size,
      display: 'inline-block',
      backgroundImage: `url(${imageUrl})`,
      backgroundSize: 'contain',
    }
  } else {
    let setHasEmoji = _getData(props)[`has_img_${props.set}`]

    if (!setHasEmoji) {
      if (props.fallback) {
        return props.fallback(data)
      } else {
        return null
      }
    } else {
      style = {
        width: props.size,
        height: props.size,
        display: 'inline-block',
        backgroundImage: `url(${props.backgroundImageFn(
          props.set,
          props.sheetSize,
        )})`,
        backgroundSize: `${100 * SHEET_COLUMNS}%`,
        backgroundPosition: _getPosition(props),
      }
    }
  }

  if (props.html) {
    style = _convertStyleToCSS(style)
    return `<span style='${style}' ${
      title ? `title='${title}'` : ''
    } class='${className}'>${children || ''}</span>`
  } else {
    return (
      <span
        key={props.emoji.id || props.emoji}
        onClick={(e) => _handleClick(e, props)}
        onMouseEnter={(e) => _handleOver(e, props)}
        onMouseLeave={(e) => _handleLeave(e, props)}
        title={title}
        className={className}
      >
        <span style={style}>{children}</span>
      </span>
    )
  }
}

Emoji.propTypes = {
  onOver: PropTypes.func,
  onLeave: PropTypes.func,
  onClick: PropTypes.func,
  fallback: PropTypes.func,
  backgroundImageFn: PropTypes.func,
  native: PropTypes.bool,
  forceSize: PropTypes.bool,
  tooltip: PropTypes.bool,
  skin: PropTypes.oneOf([1, 2, 3, 4, 5, 6]),
  sheetSize: PropTypes.oneOf([16, 20, 32, 64]),
  set: PropTypes.oneOf([
    'apple',
    'google',
    'twitter',
    'emojione',
    'messenger',
    'facebook',
  ]),
  size: PropTypes.number.isRequired,
  emoji: PropTypes.oneOfType([PropTypes.string, PropTypes.object]).isRequired,
}

Emoji.defaultProps = {
  skin: 1,
  set: 'apple',
  sheetSize: 64,
  native: false,
  forceSize: false,
  tooltip: false,
  backgroundImageFn: (set, sheetSize) =>
    `https://unpkg.com/emoji-datasource-${set}@${EMOJI_DATASOURCE_VERSION}/img/${set}/sheets-256/${sheetSize}.png`,
  onOver: () => {},
  onLeave: () => {},
  onClick: () => {},
}

export default Emoji