git ssb

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var h = require('hyperscript')
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var pull = require('pull-stream')
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var paramap = require('pull-paramap')
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var human = require('human-time')
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var plugs = require('../plugs')
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var message_link = plugs.first(exports.message_link = [])
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var message_confirm = plugs.first(exports.message_confirm = [])
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var sbot_links = plugs.first(exports.sbot_links = [])
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var sbot_links2 = plugs.first(exports.sbot_links2 = [])
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var sbot_get = plugs.first(exports.sbot_get = [])
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var getAvatar = require('ssb-avatar')
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var avatar_name = plugs.first(exports.avatar_name = [])
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var markdown = plugs.first(exports.markdown = [])
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var self_id = require('../keys').id
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function shortRefName(ref) {
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  return ref.replace(/^refs\/(heads|tags)\//, '')
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}
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function repoLink(id) {
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  var el = h('a', {href: '#'+id}, id.substr(0, 10) + '…')
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  getAvatar({links: sbot_links}, self_id, id, function (err, avatar) {
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    if(err) return console.error(err)
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    el.textContent = avatar.name
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  })
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  return el
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}
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function getIssueState(id, cb) {
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  pull(
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    sbot_links({dest: id, rel: 'issues', values: true, reverse: true}),
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    pull.map(function (msg) {
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      return msg.value.content.issues
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    }),
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    pull.flatten(),
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    pull.filter(function (issue) {
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      return issue.link === id
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    }),
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    pull.map(function (issue) {
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      return issue.merged ? 'merged' : issue.open ? 'open' : 'closed'
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    }),
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    pull.take(1),
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    pull.collect(function (err, updates) {
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      cb(err, updates && updates[0] || 'open')
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    })
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  )
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}
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//todo: 
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function messageTimestampLink(msg) {
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  var date = new Date(msg.value.timestamp)
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  return h('a.timestamp', {
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    timestamp: msg.value.timestamp,
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    title: date,
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    href: '#'+msg.key
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  }, human(date))
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}
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// a thead+tbody where the thead only is added when the first row is added
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function tableRows(headerRow) {
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  var thead = h('thead'), tbody = h('tbody')
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  var first = true
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  var t = [thead, tbody]
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  t.append = function (row) {
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    if (first) {
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      first = false
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      thead.appendChild(headerRow)
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    }
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    tbody.appendChild(row)
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  }
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  return t
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}
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function repoName(id, link) {
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  var el = link
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    ? h('a', {href: '#'+id}, id.substr(0, 8) + '…')
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    : h('ins', id.substr(0, 8) + '…')
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  getAvatar({links: sbot_links}, self_id, id, function (err, avatar) {
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    if(err) return console.error(err)
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    el.textContent = avatar.name
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  })
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  return el
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}
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function renderIssueEdit(c) {
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  var id = c.issue || c.link
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  return [
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    c.title ? h('p', 'renamed issue ', message_link(id),
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      ' to ', h('ins', c.title)) : null,
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    c.open === false ? h('p', 'closed issue ', message_link(id)) : null,
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    c.open === true ? h('p', 'reopened issue ', message_link(id)) : null]
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}
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exports.message_content = function (msg, sbot) {
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  var c = msg.value.content
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  if(c.type === 'git-repo') {
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    var branchesT, tagsT, openIssuesT, closedIssuesT, openPRsT, closedPRsT
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    var forksT
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    var div = h('div',
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      h('p', 'git repo ', repoName(msg.key)),
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      c.upstream ? h('p', 'fork of ', repoName(c.upstream, true)) : '',
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      h('p', h('code', 'ssb://' + msg.key)),
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      h('div.git-table-wrapper', {style: {'max-height': '12em'}},
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        h('table',
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          branchesT = tableRows(h('tr',
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            h('th', 'branch'),
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            h('th', 'commit'),
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            h('th', 'last update'))),
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          tagsT = tableRows(h('tr',
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            h('th', 'tag'),
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            h('th', 'commit'),
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            h('th', 'last update'))))),
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      h('div.git-table-wrapper', {style: {'max-height': '16em'}},
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        h('table',
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          openIssuesT = tableRows(h('tr',
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            h('th', 'open issues'))),
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          closedIssuesT = tableRows(h('tr',
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            h('th', 'closed issues'))))),
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      h('div.git-table-wrapper', {style: {'max-height': '16em'}},
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        h('table',
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          openPRsT = tableRows(h('tr',
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            h('th', 'open pull requests'))),
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          closedPRsT = tableRows(h('tr',
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            h('th', 'closed pull requests'))))),
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      h('div.git-table-wrapper',
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        h('table',
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          forksT = tableRows(h('tr',
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            h('th', 'forks'))))))
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    // compute refs
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    var refs = {}
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    pull(
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      sbot_links({
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        reverse: true,
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        source: msg.value.author,
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        dest: msg.key,
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        rel: 'repo',
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        values: true
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      }),
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      pull.drain(function (link) {
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        var refUpdates = link.value.content.refs || {}
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        Object.keys(refUpdates).reverse().filter(function (ref) {
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          if (refs[ref]) return
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          refs[ref] = true
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          var rev = refUpdates[ref]
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          if (!rev) return
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          var parts = /^refs\/(heads|tags)\/(.*)$/.exec(ref) || []
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          var t
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          if (parts[1] === 'heads') t = branchesT
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          else if (parts[1] === 'tags') t = tagsT
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          if (t) t.append(h('tr',
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            h('td', parts[2]),
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            h('td', h('code', rev)),
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            h('td', messageTimestampLink(link))))
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        })
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      }, function (err) {
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        if (err) console.error(err)
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      })
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    )
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    // list issues and pull requests
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    pull(
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      sbot_links({
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        reverse: true,
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        dest: msg.key,
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        rel: 'project',
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        values: true
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      }),
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      paramap(function (link, cb) {
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        getIssueState(link.key, function (err, state) {
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          if(err) return cb(err)
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          link.state = state
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          cb(null, link)
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        })
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      }),
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      pull.drain(function (link) {
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        var c = link.value.content
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        var title = c.title || (c.text ? c.text.length > 70
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          ? c.text.substr(0, 70) + '…'
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          : c.text : link.key)
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        var author = link.value.author
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        var t = c.type === 'pull-request'
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          ? link.state === 'open' ? openPRsT : closedPRsT
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          : link.state === 'open' ? openIssuesT : closedIssuesT
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        t.append(h('tr',
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          h('td',
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            h('a', {href: '#'+link.key}, title), h('br'),
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            h('small',
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              'opened ', messageTimestampLink(link),
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              ' by ', h('a', {href: '#'+author}, avatar_name(author))))))
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      }, function (err) {
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        if (err) console.error(err)
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      })
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    )
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    // list forks
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    pull(
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      sbot_links({
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        reverse: true,
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        dest: msg.key,
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        rel: 'upstream'
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      }),
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      pull.drain(function (link) {
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        forksT.append(h('tr', h('td',
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          repoName(link.key, true),
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          ' by ', h('a', {href: '#'+link.source}, avatar_name(link.source)))))
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      }, function (err) {
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        if (err) console.error(err)
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      })
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    )
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    return div
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  }
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  if(c.type === 'git-update') {
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    return h('p',
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      'pushed to ',
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      repoLink(c.repo),
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      c.refs ? h('ul', Object.keys(c.refs).map(function (ref) {
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        var rev = c.refs[ref]
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        return h('li',
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          shortRefName(ref) + ': ',
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          rev ? h('code', rev) : h('em', 'deleted'))
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      })) : null,
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      Array.isArray(c.issues) ? c.issues.map(function (issue) {
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        if (issue.merged === true)
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          return ['Merged ', message_link(issue.link), ' in ',
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            h('code', issue.object), ' ', h('q', issue.label)]
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        if (issue.open === false)
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          return ['Closed ', message_link(issue.link), ' in ',
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            h('code', issue.object), ' ', h('q', issue.label)]
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      }) : null
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    )
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  }
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  if(c.type === 'issue-edit') {
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    return h('div',
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      c.issue ? renderIssueEdit(c) : null,
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      c.issues ? c.issues.map(renderIssueEdit) : null)
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  }
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  if(c.type === 'issue') {
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    return h('div',
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      h('p', 'opened issue on ', repoLink(c.project)),
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      c.title ? h('h4', c.title) : '',
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      markdown(c)
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    )
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  }
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  if(c.type === 'pull-request') {
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    return h('div',
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      h('p', 'opened pull-request ',
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        'to ', repoLink(c.repo), ':', c.branch, ' ',
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        'from ', repoLink(c.head_repo), ':', c.head_branch),
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      c.title ? h('h4', c.title) : '',
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      markdown(c)
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    )
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  }
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}
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exports.message_meta = function (msg, sbot) {
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  var type = msg.value.content.type
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  if (type === 'issue' || type === 'pull-request') {
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    var el = h('em', '...')
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    // TODO: update if issue is changed
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    getIssueState(msg.key, function (err, state) {
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      if (err) return console.error(err)
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      el.textContent = state
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    })
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    return el
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  }
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}
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exports.message_action = function (msg, sbot) {
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  var c = msg.value.content
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  if(c.type === 'issue' || c.type === 'pull-request') {
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    var isOpen
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    var a = h('a', {href: '#', onclick: function () {
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      message_confirm({
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        type: 'issue-edit',
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        root: msg.key,
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        issues: [{
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          link: msg.key,
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          open: !isOpen
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        }]
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      }, function (err, msg) {
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        if(err) return alert(err)
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        if(!msg) return
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        isOpen = msg.value.content.open
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        update()
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      })
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    }})
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    getIssueState(msg.key, function (err, state) {
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      if (err) return console.error(err)
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      isOpen = state === 'open'
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      update()
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    })
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    function update() {
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      a.textContent = c.type === 'pull-request'
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        ? isOpen ? 'Close Pull Request' : 'Reopen Pull Request'
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        : isOpen ? 'Close Issue' : 'Reopen Issue'
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    }
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    return a
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  }
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}
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