import { api as api_type } from 'app/types'

// import { format, formatDistance } from 'date-fns'
import format from 'date-fns/format'
import formatDistance from 'date-fns/formatDistance'

export const formatDateTime = dateStr => format(new Date(dateStr), 'd MMM yyyy H:mm')
export const formatDate = dateStr => format(new Date(dateStr), 'd MMM yyyy')
export const formatTime = dateStr => format(new Date(dateStr), 'H:mm')
export const formatAge = dateStr => formatDistance(new Date(), new Date(dateStr)) + ' ago.'
export const toArray = a => Array.from(a)

/* Mobile check */

export const isiPhone = !!((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)))
export const isiPad = !!(navigator.userAgent.match(/iPad/i))
export const isAndroid = !!(navigator.userAgent.match(/Android/i))
export const isMobile = isiPhone || isiPad || isAndroid
export const isHandheld = isiPhone || (isAndroid && window.innerWidth <= 760)
export const isTablet = isMobile && window.innerWidth > 760
export const isDesktop = !isMobile

const htmlClassList = document.body.parentNode.classList
htmlClassList.add(isDesktop ? 'desktop' : 'mobile')

/* Default image dimensions */

export const widths = {
  th: 160,
  sm: 320,
  md: 640,
  lg: 1280,
}

/* Formatting functions */

const acronyms = 'id url cc sa fp md5 sha256'.split(' ').map(s => '_' + s)
const acronymsUpperCase = acronyms.map(s => s.toUpperCase())

export const formatName = s => {
  acronyms.forEach((acronym, i) => s = s.replace(acronym, acronymsUpperCase[i]))
  return s.replace(/_/g, ' ')
}

// Use to pad frame numbers with zeroes
export const pad = (n, m) => {
  let s = String(n || 0)
  while (s.length < m) {
    s = '0' + s
  }
  return s
}

export const courtesyS = (n, s) => n + ' ' + (n === 1 ? s : s + 's')
export const capitalize = s => s.split(' ').map(capitalizeWord).join(' ')
export const capitalizeWord = s => s.substr(0, 1).toUpperCase() + s.substr(1)
export const padSeconds = n => n < 10 ? '0' + n : n

export const timestamp = (n = 0, fps = 1, ms = false, h_label = ':', m_label = ':', s_label = '') => {
  if (n < 0) {
    return '0' + m_label + '00' + s_label
  }
  let s = ''
  n /= fps
  if (ms) {
    const mantissa = Math.floor((n % 1) * 10)
    s = '.' + mantissa
  }
  n = Math.floor(n)
  s = padSeconds(n % 60) + s
  n = Math.floor(n / 60)
  if (n > 60) {
    return Math.floor(n / 60) + h_label + padSeconds(n % 60) + m_label + s + s_label
  }
  return (n % 60) + m_label + s + s_label
}

export const timestampHMS = n => timestamp(n, 1, false, 'h', 'm', 's')

export const timestampToSeconds = time_str => {
  const time_str_parts = (time_str || "").trim().split(":").map(s => parseFloat(s))
  if (time_str_parts.length === 3) {
    return (time_str_parts[0] * 60 + time_str_parts[1]) * 60 + time_str_parts[2]
  }
  if (time_str_parts.length === 2) {
    return time_str_parts[0] * 60 + time_str_parts[1]
  }
  return time_str_parts[0]
}

export const percent = n => (n * 100).toFixed(1) + '%'

export const px = (n, w) => Math.round(n * w) + 'px'

export const clamp = (n, a=0, b=1) => n < a ? a : n < b ? n : b
export const dist = (x1, y1, x2, y2) => Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2))
export const xor = (a,b) => ((!a && !!b) || (!!a && !b))
export const mod = (n, m) => n - (m * Math.floor(n / m))
export const angle = (x1, y1, x2, y2) => Math.atan2(y2 - y1, x2 - x1)
export const lerp = (n,a,b) => (b-a)*n+a
export const floatEQ = (a,b) => ((a*10|0) === (b*10|0))
export const floatLT = (a,b) => ((a*10|0) < (b*10|0))
export const floatLTE = (a,b) => (floatEQ(a,b) || floatLT(a,b))
export const floatGT = (a,b) => ((a*10|0) > (b*10|0))
export const floatGTE = (a,b) => (floatEQ(a,b) || floatGT(a,b))
export const floatInRange = (a,b,c) => floatLTE(a, b) && floatLT(b, c)
export const simpleArraysEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b)

/* forms */
export const mapNameToSelectOption = labels => (
  name => ({
    name,
    label: labels[name] || capitalize(name.replace('_', ' '))
  })
)

/* URLs */

export const sha256_tree = (sha256, branch_size=2, tree_depth=2) => {
  const tree_size = tree_depth * branch_size
  let tree = ""
  for (var i = 0; i < tree_size; i += branch_size) {
    tree += '/' + sha256.substr(i, branch_size)
  }
  return tree
}

export const urlSearchParamsToDict = search => {
  const params = new URLSearchParams(search)
  const dict = {}
  params.forEach((value, key) => { // ???
    dict[key] = value
  })
  return dict
}

/* AJAX */

let cachedAuth = null
let token = ''
let username = ''

export const post = (dispatch, type=api_type, tag, url, data) => {
  let headers
  if (data instanceof FormData) {
    headers = {
      Accept: 'application/json',
    }
  } else if (data) {
    headers = {
      Accept: 'application/json',
      'Content-Type': 'application/json; charset=utf-8',
    }
    data = JSON.stringify(data)
  }

  dispatch({
    type: type.loading,
    tag,
  })
  return fetch(url, {
    method: 'POST',
    body: data,
    headers,
  })
  .then(res => res.json())
  .then(res => {
    dispatch({
      type: type.loaded,
      tag,
      data: res,
    })
    return res
  })
  .catch(err => {
    dispatch({
      type: type.error,
      tag,
      err,
    })
    return err
  })
}

export const api = (dispatch, type=api_type, tag, url, data) => {
  dispatch({
    type: type.loading,
    tag,
  })
  if (url.indexOf('http') !== 0) {
    url = window.location.origin + url
  }
  url = new URL(url)
  if (data) {
    url.search = new URLSearchParams(data).toString()
  }
  let req = fetch(url, {
    method: 'GET',
    // mode: 'cors',
  })
  // console.log(tag)
  if (tag === 'text') {
    req = req.then(res => res.text())
  } else {
    req = req.then(res => res.json())
  }
  req = req.then(res => {
    dispatch({
      type: type.loaded,
      tag,
      data: res,
    })
    return res
  })
  .catch(err => dispatch({
    type: type.error,
    tag,
    err,
  }))
  return req
}

/* sorting */

export const numericSort = {
  asc: (a,b) => a[0] - b[0],
  desc: (a,b) => b[0] - a[0],
}
export const stringSort = {
  asc: (a,b) => a[0].localeCompare(b[0]),
  desc: (a,b) => b[0].localeCompare(a[0]),
}
export const orderByFn = (s='name asc') => {
  const [field='name', direction='asc'] = s.split(' ')
  let mapFn, sortFn
  switch (field) {
    case 'id':
      mapFn = a => [parseInt(a.id) || 0, a]
      sortFn = numericSort[direction]
      break
    case 'epoch':
      mapFn = a => [parseInt(a.epoch || a.epochs) || 0, a]
      sortFn = numericSort[direction]
      break
    case 'size':
      mapFn = a => [parseInt(a.size) || 0, a]
      sortFn = numericSort[direction]
      break
    case 'start_ts':
      mapFn = a => [parseFloat(a.start_ts) || 0, a]
      sortFn = numericSort[direction]
      break
    case 'date':
      mapFn = a => [+new Date(a.date || a.created_at), a]
      sortFn = numericSort[direction]
      break
    case 'updated_at':
      mapFn = a => [+new Date(a.updated_at), a]
      sortFn = numericSort[direction]
      break
    case 'priority':
      mapFn = a => [parseInt(a.priority) || parseInt(a.id) || 1000, a]
      sortFn = numericSort[direction]
      break
    case 'title':
      mapFn = a => [a.title || "", a]
      sortFn = stringSort[direction]
      break
    case 'author':
      mapFn = a => {
        let author = (a.author || "").split(' and ')[0].split(' ')
        author.unshift(author.pop())
        author = author.join(' ')
        return [author, a]
      }
      sortFn = stringSort[direction]
      break
    case 'name':
    default:
      mapFn = a => [a.name || "", a]
      sortFn = stringSort[direction]
      break
  }
  return { mapFn, sortFn }
}
export const getOrderedIds = (objects, sort, prepend) => {
  if (!prepend) {
    prepend = []
  }
  const { mapFn, sortFn } = orderByFn(sort)
  return prepend.concat(objects.map(mapFn).sort(sortFn).map(a => a[1].id))
}
export const getOrderedIdsFromLookup = (lookup, sort) => {
  return getOrderedIds(Object.keys(lookup).map(key => lookup[key]), sort)
}

/* parallel promises */

export const allProgress = (promises, progress_cb) => {
  let d = 0
  progress_cb(0, 0, promises.length)
  promises.forEach((p) => {
    p.then((s) => {
      d += 1
      progress_cb(Math.floor((d * 100) / promises.length), d, promises.length)
      return s
    })
  })
  return Promise.all(promises)
}

/* Clipboard */

export function writeToClipboard(str) {
  return new Promise((resolve, reject) => {
    let success = false
    function listener(e) {
      e.clipboardData.setData("text/plain", str)
      e.preventDefault()
      success = true
    }
    document.addEventListener("copy", listener)
    document.execCommand("copy")
    document.removeEventListener("copy", listener)
    if (success) {
      resolve()
    } else {
      reject()
    }
  })
}