const nest = require('depnest')
const { h, computed, when } = require('mutant')
const get = require('lodash/get')
const path = require('path')

exports.gives = nest('app.html.header')

exports.needs = nest('keys.sync.id', 'first')

const SETTINGS_PAGES = [
  'settings',
  'userEdit',
]

exports.create = (api) => {
  return nest('app.html.header', (nav) => {
    const { location, push } = nav

    const loc = computed(location, location => {
      if (typeof location != 'object') return {}

      return location || {}
    })

    const isSettings = computed(loc, loc => {
      return SETTINGS_PAGES.includes(loc.page)
    })

    const isFeed = computed([isSettings], isSettings => !isSettings)

    return h('Header', [
      h('nav', [
        h('img.feed', { 
          src: when(isFeed, assetPath('feed_on.png'), assetPath('feed.png')),
          'ev-click': () => push({page: 'blogIndex'}),
        }),
        h('img.feed', { 
          src: when(isSettings, assetPath('settings_on.png'), assetPath('settings.png')),
          'ev-click': () => push({page: 'settings'})
        }),
      ]),
    ])
  })
}

function assetPath (name) {
  return path.join(__dirname, '../../assets', name)
}