git ssb

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var { h, computed, when, map, send } = require('mutant')
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var nest = require('depnest')
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var extend = require('xtend')
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var moment = require('moment-timezone')
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var localTimezone = moment.tz.guess()
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exports.needs = nest({
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  'message.html.markdown': 'first',
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  'message.html.layout': 'first',
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  'message.html.decorate': 'reduce',
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  'message.async.publish': 'first',
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  'keys.sync.id': 'first',
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  'about.html.image': 'first',
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  'about.obs.latestValue': 'first',
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  'about.obs.groupedValues': 'first',
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  'about.obs.valueFrom': 'first',
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  'about.obs.name': 'first',
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  'contact.obs.following': 'first',
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  'blob.sync.url': 'first',
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  'gathering.sheet.edit': 'first'
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})
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exports.gives = nest('message.html', {
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  canRender: true,
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  render: true
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})
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exports.create = function (api) {
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  var following = null
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  return nest('message.html', {
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    canRender: isRenderable,
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    render: function (msg, opts) {
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      if (!isRenderable(msg)) return
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      var yourId = api.keys.sync.id()
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      // allow override of resolved about messages for preview in modules/gathering/sheet/edit.js
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      var about = msg.key ? extend({
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        hidden: api.about.obs.valueFrom(msg.key, 'hidden', yourId),
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        image: api.about.obs.latestValue(msg.key, 'image'),
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        title: api.about.obs.latestValue(msg.key, 'title'),
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        description: api.about.obs.latestValue(msg.key, 'description'),
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        location: api.about.obs.latestValue(msg.key, 'location'),
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        startDateTime: api.about.obs.latestValue(msg.key, 'startDateTime')
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      }, msg.previewAbout) : msg.previewAbout
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      var attendees = msg.key ? computed([api.about.obs.groupedValues(msg.key, 'attendee')], getAttendees) : []
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      var disableActions = !!msg.previewAbout
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      if (!following) {
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        following = api.contact.obs.following(yourId)
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      }
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      var imageUrl = computed(about.image, (id) => api.blob.sync.url(id))
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      var imageId = computed(about.image, (link) => (link && link.link) || link)
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      var content = h('GatheringCard', [
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        h('div.title', [
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          h('a', {
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            href: msg.key
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          }, about.title),
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          h('button', {
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            disabled: disableActions,
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            'ev-click': send(api.gathering.sheet.edit, msg.key)
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          }, 'Edit Details')
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        ]),
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        h('div.time', computed(about.startDateTime, formatTime)),
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        when(about.image, h('a.image', {
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          href: imageId,
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          style: {
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            'background-image': computed(imageUrl, (url) => `url(${url})`)
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          }
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        })),
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        h('div.attending', [
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          h('div.title', ['Attendees', ' (', computed([attendees], (x) => x.length), ')']),
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          h('div.attendees', [
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            map(attendees, (attendee) => {
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              return h('a.attendee', {
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                href: attendee,
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                title: nameAndFollowWarning(attendee)
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              }, api.about.html.image(attendee))
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            })
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          ]),
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          h('div.actions', [
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            h('button -attend', {
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              disabled: disableActions,
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              'ev-click': send(publishAttending, msg.key)
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            }, `Attending`),
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            h('button -attend', {
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              disabled: disableActions,
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              'ev-click': send(publishNotAttending, msg.key)
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            }, `Can't Attend`)
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          ])
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        ]),
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        h('div.location', markdown(about.location)),
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        when(about.description, h('div.description', markdown(about.description)))
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      ])
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      var editPreview = msg.previewAbout && msg.key
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      var element = api.message.html.layout(msg, extend({
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        content,
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        miniContent: editPreview ? 'Edited a gathering' : 'Added a gathering',
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        actions: !msg.previewAbout,
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        layout: 'mini'
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      }, opts))
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      // hide if no title set or hidden
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      var visible = computed([about.title, about.hidden], (title, hidden) => {
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        return title && !hidden
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      })
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      return when(visible, api.message.html.decorate(element, {
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        msg
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      }))
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    }
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  })
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  function publishAttending (id) {
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    var yourId = api.keys.sync.id()
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    // publish with confirm
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    api.message.async.publish({
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      type: 'about',
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      about: id,
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      attendee: {
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        link: yourId
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      }
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    })
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  }
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  function publishNotAttending (id) {
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    var yourId = api.keys.sync.id()
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    // publish with confirm
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    api.message.async.publish({
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      type: 'about',
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      about: id,
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      attendee: {
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        link: yourId,
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        remove: true
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      }
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    })
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  }
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  function nameAndFollowWarning (id) {
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    var yourId = api.keys.sync.id()
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    return computed([api.about.obs.name(id), id, following], function nameAndFollowWarning (name, id, following) {
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      if (id === yourId) {
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        return `${name} (you)`
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      } else if (following.includes(id)) {
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        return `${name}`
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      } else {
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        return `${name} (not following)`
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      }
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    })
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  }
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  function markdown (obs) {
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    return computed(obs, (text) => {
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      if (typeof text === 'string') return api.message.html.markdown(text)
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    })
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  }
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}
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function formatTime (time) {
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  if (time && time.epoch) {
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    return moment(time.epoch).tz(localTimezone).format('LLLL zz')
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  }
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}
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function getAttendees (lookup) {
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  return Object.keys(lookup)
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}
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function isRenderable (msg) {
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  return (msg.value.content.type === 'gathering') ? true : undefined
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}
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