git ssb

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const h = require('../h')
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const fs = require('fs')
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const { Value, when, computed } = require('@mmckegg/mutant')
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const u = require('../util')
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const pull = require('pull-stream')
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const Scroller = require('pull-scroll')
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const TextNodeSearcher = require('text-node-searcher')
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exports.needs = {
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  build_scroller: 'first',
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  message_render: 'first',
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  sbot_log: 'first',
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  sbot_fulltext_search: 'first'
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}
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exports.gives = {
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  screen_view: true,
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  mcss: true
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}
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var whitespace = /\s+/
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function andSearch(terms, inputs) {
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  for(var i = 0; i < terms.length; i++) {
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    var match = false
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    for(var j = 0; j < inputs.length; j++) {
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      if(terms[i].test(inputs[j])) match = true
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    }
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    //if a term was not matched by anything, filter this one
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    if(!match) return false
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  }
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  return true
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}
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function searchFilter(terms) {
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  return function (msg) {
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    var c = msg && msg.value && msg.value.content
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    return c && (
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      msg.key == terms[0] ||
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      andSearch(terms.map(function (term) {
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        return new RegExp('\\b'+term+'\\b', 'i')
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      }), [c.text, c.name, c.title])
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    )
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  }
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}
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function createOrRegExp(ary) {
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  return new RegExp(ary.map(function (e) {
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    return '\\b'+e+'\\b'
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  }).join('|'), 'i')
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}
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function highlight(el, query) {
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  var searcher = new TextNodeSearcher({container: el})
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  searcher.query = query
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  searcher.highlight()
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  return el
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}
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function fallback(reader) {
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  var fallbackRead
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  return function (read) {
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    return function (abort, cb) {
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      read(abort, function next(end, data) {
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        if (end && reader && (fallbackRead = reader(end))) {
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          reader = null
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          read = fallbackRead
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          read(abort, next)
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        } else {
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          cb(end, data)
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        }
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      })
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    }
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  }
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}
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exports.create = function (api) {
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  return {
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    screen_view,
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    mcss: () => fs.readFileSync(__filename.replace(/js$/, 'mcss'), 'utf8')
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  }
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  function screen_view (path) {
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    if (path[0] !== '?') return
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    var queryStr = path.substr(1).trim()
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    var query = queryStr.split(whitespace)
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    var matchesQuery = searchFilter(query)
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    const isLinearSearch = Value(false)
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    const isFulltextSearchDone = Value(false)
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    const searched = Value(0)
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    const matches = Value(0)
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    const hasNoFulltextMatches = computed([isFulltextSearchDone, matches],
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      (done, matches) => done && matches === 0)
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    const searchHeader = h('Search', [
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      h('header', h('h1', query.join(' '))),
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      when(isLinearSearch, 
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        h('section.details', [ 
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          h('div.searched', ['Searched: ', searched]),
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          h('div.matches', [matches, ' matches']) 
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        ]),
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        when(hasNoFulltextMatches,
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          h('section.details', [
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            h('div.matches', 'No matches')
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          ])
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        )
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      )
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    ])
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    var { container, content } = api.build_scroller({ prepend: searchHeader })
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    container.id = path // helps tabs find this tab
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    function renderMsg(msg) {
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      var el = api.message_render(msg)
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      highlight(el, createOrRegExp(query))
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      return el
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    }
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    pull(
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      api.sbot_log({old: false}),
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      pull.filter(matchesQuery),
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      Scroller(container, content, renderMsg, true, false)
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    )
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    pull(
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      u.next(api.sbot_fulltext_search, {query: queryStr, reverse: true, limit: 500, live: false}),
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      fallback((err) => {
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        if (err === true) {
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          isFulltextSearchDone.set(true)
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        } else if (/^no source/.test(err.message)) {
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          isLinearSearch.set(true)
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          return pull(
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            u.next(api.sbot_log, {reverse: true, limit: 500, live: false}),
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            pull.through(() => searched.set(searched()+1)),
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            pull.filter(matchesQuery)
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          )
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        }
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      }),
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      pull.through(() => matches.set(matches()+1)),
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      Scroller(container, content, renderMsg, false, false)
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    )
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    return container
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  }
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}
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