import {cached} from '../util/core'

const decode = decodeURIComponent
const encode = encodeURIComponent

export function parseQuery(query) {
  const res = {}

  query = query.trim().replace(/^(\?|#|&)/, '')

  if (!query) {
    return res
  }

  // Simple parse
  query.split('&').forEach(function (param) {
    const parts = param.replace(/\+/g, ' ').split('=')

    res[parts[0]] = parts[1] && decode(parts[1])
  })

  return res
}

export function stringifyQuery(obj, ignores = []) {
  const qs = []

  for (const key in obj) {
    if (ignores.indexOf(key) > -1) {
      continue
    }
    qs.push(
      obj[key] ?
        `${encode(key)}=${encode(obj[key])}`.toLowerCase() :
        encode(key)
    )
  }

  return qs.length ? `?${qs.join('&')}` : ''
}

export const isAbsolutePath = cached(path => {
  return /(:|(\/{2}))/g.test(path)
})

export const getParentPath = cached(path => {
  return /\/$/g.test(path) ?
    path :
    (path = path.match(/(\S*\/)[^/]+$/)) ? path[1] : ''
})

export const cleanPath = cached(path => {
  return path.replace(/^\/+/, '/').replace(/([^:])\/{2,}/g, '$1/')
})

export function getPath(...args) {
  return cleanPath(args.join('/'))
}

export const replaceSlug = cached(path => {
  return path.replace('#', '?id=')
})