git ssb

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var pull = require('pull-stream')
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var paramap = require('pull-paramap')
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var cat = require('pull-cat')
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var many = require('pull-many')
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var multicb = require('multicb')
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var GitRepo = require('pull-git-repo')
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var u = require('../../lib/util')
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var markdown = require('../../lib/markdown')
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var forms = require('../../lib/forms')
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var ssbRef = require('ssb-ref')
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module.exports = function (repoRoutes, web) {
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  return new RepoPullReqRoutes(repoRoutes, web)
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}
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function RepoPullReqRoutes(repoRoutes, web) {
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  this.repo = repoRoutes
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  this.web = web
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}
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var P = RepoPullReqRoutes.prototype
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/* Pull Request */
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P.serveRepoPullReq = function (req, repo, pr, path, postId) {
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  var self = this
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  var headRepo, authorLink
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  var page = path[0] || 'activity'
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  var title = u.escape(pr.title) + ' · %{author}/%{repo}'
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  return self.repo.renderRepoPage(req, repo, 'pulls', null, title, cat([
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    pull.once('<div class="pull-request">' +
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      '<h3>' + u.link([pr.id], pr.title) + '</h3>' +
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      '<code>' + pr.id + '</code>'),
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    u.readOnce(function (cb) {
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      var done = multicb({ pluck: 1, spread: true })
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      var gotHeadRepo = done()
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      self.web.about.getName(pr.author, done())
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      var sameRepo = (pr.headRepo == pr.baseRepo)
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      self.web.getRepo(pr.headRepo, function (err, headRepo) {
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        if (err) return cb(err)
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        self.web.getRepoName(headRepo.feed, headRepo.id, done())
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        self.web.about.getName(headRepo.feed, done())
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        gotHeadRepo(null, GitRepo(headRepo))
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      })
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      done(function (err, _headRepo, issueAuthorName,
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          headRepoName, headRepoAuthorName) {
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        if (err) return cb(err)
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        headRepo = _headRepo
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        authorLink = u.link([pr.author], issueAuthorName)
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        var repoLink = u.link([pr.headRepo], headRepoName)
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        var headRepoAuthorLink = u.link([headRepo.feed], headRepoAuthorName)
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        var headRepoLink = u.link([headRepo.id], headRepoName)
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        var headBranchLink = u.link([headRepo.id, 'tree', pr.headBranch])
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        var baseBranchLink = u.link([repo.id, 'tree', pr.baseBranch])
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        cb(null, '<section class="collapse">' +
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          '<strong class="issue-status ' +
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          (pr.open ? 'open' : 'closed') + '">' +
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          req._t(pr.open ? 'issue.state.Open' : 'issue.state.Closed') +
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          '</strong> ' +
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          req._t('pullRequest.WantToMerge', {
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            name: authorLink,
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            base: '<code>' + baseBranchLink + '</code>',
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            head: (sameRepo ?
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              '<code>' + headBranchLink + '</code>' :
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              '<code class="bgslash">' +
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                headRepoAuthorLink + ' / ' +
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                headRepoLink + ' / ' +
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                headBranchLink + '</code>')
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          }) + '</section>')
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      })
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    }),
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    pull.once(
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      u.nav([
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        [[pr.id], req._t('Discussion'), 'activity'],
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        [[pr.id, 'commits'], req._t('Commits'), 'commits'],
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        [[pr.id, 'files'], req._t('Files'), 'files']
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      ], page)),
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    u.readNext(function (cb) {
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      if (page == 'commits')
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        self.renderPullReqCommits(req, pr, repo, headRepo, cb)
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      else if (page == 'files')
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        self.renderPullReqFiles(req, pr, repo, headRepo, cb)
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      else cb(null,
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        self.renderPullReqActivity(req, pr, repo, headRepo, authorLink, postId))
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    })
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  ]))
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}
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P.renderPullReqCommits = function (req, pr, baseRepo, headRepo, cb) {
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  var self = this
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  self.web.pullReqs.getRevs(pr.id, function (err, revs) {
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    if (err) return cb(null, self.web.renderError(err))
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    cb(null, cat([
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      pull.once('<section>'),
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      self.renderCommitLog(req, baseRepo, revs.base, headRepo, revs.head),
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      pull.once('</section>')
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    ]))
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  })
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}
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P.renderPullReqFiles = function (req, pr, baseRepo, headRepo, cb) {
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  var self = this
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  self.web.pullReqs.getRevs(pr.id, function (err, revs) {
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    if (err) return cb(null, self.web.renderError(err))
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    cb(null, cat([
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      pull.once('<section>'),
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      self.repo.renderDiffStat(req,
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        [baseRepo, headRepo], [revs.base, revs.head]),
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      pull.once('</section>')
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    ]))
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  })
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}
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P.renderPullReqActivity = function (req, pr, repo, headRepo, authorLink, postId) {
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  var self = this
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  var msgTimeLink = u.link([pr.id],
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    new Date(pr.created_at).toLocaleString(req._locale))
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  var newestMsg = {key: pr.id, value: {timestamp: pr.created_at}}
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  var isAuthor = (self.web.myId == pr.author) || (self.web.myId == repo.feed)
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  return cat([
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    u.readOnce(function (cb) {
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      cb(null,
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        '<section class="collapse">' +
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          authorLink + ' &middot; ' + msgTimeLink +
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          markdown(pr.text, repo) + '</section>')
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    }),
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    // render posts, edits, and updates
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    pull(
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      many([
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        self.web.ssb.links({
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          dest: pr.id,
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          values: true
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        }),
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        u.readNext(function (cb) {
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          cb(null, pull(
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            self.web.ssb.links({
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              dest: headRepo.id,
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              source: headRepo.feed,
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              rel: 'repo',
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              values: true,
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              reverse: true
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            }),
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            pull.take(function (link) {
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              return link.value.timestamp > pr.created_at
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            }),
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            pull.filter(function (link) {
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              return link.value.content.type == 'git-update'
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                && ('refs/heads/' + pr.headBranch) in link.value.content.refs
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            })
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          ))
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        })
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      ]),
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      self.web.addAuthorName(),
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      pull.unique('key'),
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      pull.through(function (msg) {
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        if (msg.value.timestamp > newestMsg.value.timestamp)
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          newestMsg = msg
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      }),
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      u.sortMsgs(),
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      pull.map(function (item) {
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        if (item.value.content.type == 'git-update')
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          return self.renderBranchUpdate(req, pr, item)
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        return self.repo.issues.renderIssueActivityMsg(req, repo, pr,
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          req._t('pull request'), postId, item)
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      })
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    ),
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    !self.web.isPublic && isAuthor && pr.open && pull.once(
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      '<section class="merge-instructions">' +
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      '<input type="checkbox" class="toggle" id="merge-instructions"/>' +
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      '<h4><label for="merge-instructions" class="toggle-link"><a>' +
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      req._t('mergeInstructions.MergeViaCmdLine') +
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      '</a></label></h4>' +
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      '<div class="contents">' +
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      '<p>' + req._t('mergeInstructions.CheckOut') + '</p>' +
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      '<pre>' +
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      'git fetch ssb://' + u.escape(pr.headRepo) + ' ' +
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        u.escape(pr.headBranch) + '\n' +
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      'git checkout -b ' + u.escape(pr.headBranch) + ' FETCH_HEAD' +
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      '</pre>' +
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      '<p>' + req._t('mergeInstructions.MergeAndPush') + '</p>' +
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      '<pre>' +
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      'git checkout ' + u.escape(pr.baseBranch) + '\n' +
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      'git merge ' + u.escape(pr.headBranch) + '\n' +
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      'git push ssb ' + u.escape(pr.baseBranch) +
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      '</pre>' +
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      '</div></section>'),
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    !self.web.isPublic && u.readOnce(function (cb) {
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      cb(null, forms.issueComment(req, pr, repo, newestMsg.key,
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				isAuthor, req._t('pull request')))
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    })
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  ])
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}
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P.renderBranchUpdate = function (req, pr, msg) {
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  var authorLink = u.link([msg.value.author], msg.authorName)
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  var msgLink = u.link([msg.key],
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    new Date(msg.value.timestamp).toLocaleString(req._locale))
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  var rev = msg.value.content.refs['refs/heads/' + pr.headBranch]
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  if (!rev)
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    return '<section class="collapse">' +
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      req._t('NameDeletedBranch', {
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        name: authorLink,
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        branch: '<code>' + pr.headBranch + '</code>'
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      }) + ' &middot; ' + msgLink +
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      '</section>'
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  var revLink = u.link([pr.headRepo, 'commit', rev], rev.substr(0, 8))
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  return '<section class="collapse">' +
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    req._t('NameUpdatedBranch', {
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      name: authorLink,
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      rev: '<code>' + revLink + '</code>'
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    }) + ' &middot; ' + msgLink +
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    '</section>'
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}
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/* Compare changes */
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P.branchMenu = function (repo, name, currentName) {
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  return cat([
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    pull.once('<select name="' + name + '">'),
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    pull(
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      repo.refs(),
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      pull.map(function (ref) {
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        var m = ref.name.match(/^refs\/([^\/]*)\/(.*)$/) || [,, ref.name]
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        return m[1] == 'heads' && m[2]
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      }),
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      pull.filter(Boolean),
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      u.pullSort(),
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      pull.map(this.repo.formatRevOptions(currentName))
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    ),
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    pull.once('</select>')
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  ])
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}
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P.serveRepoCompare = function (req, repo) {
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  var self = this
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  var query = req._u.query
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  var base
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  var count = 0
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  var title = req._t('CompareChanges') + ' · %{author}/%{repo}'
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  return self.repo.renderRepoPage(req, repo, 'pulls', null, title, cat([
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    pull.once('<h3>' + req._t('CompareChanges') + '</h3>' +
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      '<form action="' + u.encodeLink(repo.id) + '/comparing" method="get">' +
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      '<section>'),
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    pull.once(req._t('BaseBranch') + ': '),
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    u.readNext(function (cb) {
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      if (query.base) gotBase(null, query.base)
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      else repo.getSymRef('HEAD', true, gotBase)
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      function gotBase(err, ref) {
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        if (err) return cb(err)
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        cb(null, self.branchMenu(repo, 'base', base = ref || 'HEAD'))
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      }
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    }),
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    pull.once('<br/>' + req._t('ComparisonRepoBranch') + ':'),
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    pull(
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      self.repo.getForks(repo, true),
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      pull.asyncMap(function (msg, cb) {
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        self.web.getRepo(msg.key, function (err, repo) {
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          if (err) return cb(err)
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          cb(null, {
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            msg: msg,
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            repo: repo
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          })
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        })
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      }),
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      pull.map(renderFork),
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      pull.flatten()
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    ),
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    pull.once('<div class="bgslash">' +
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      '<input type="radio" name="head" value="other" id="other-radio"> ' +
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      '<label for="other-radio">other</label>: ' +
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      '<input name="other_repo" placeholder="repo id"> / ' +
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      '<input name="other_branch" placeholder="branch"></div>'),
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    pull.once('</section>'),
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    u.readOnce(function (cb) {
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      cb(null,
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        '<button type="submit" class="btn">' +
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        req._t('Compare') + '</button>')
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    }),
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    pull.once('</form>')
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  ]))
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  function renderFork(fork) {
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    return pull(
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      fork.repo.refs({inherited: false}),
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      pull.map(function (ref) {
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        var m = /^refs\/([^\/]*)\/(.*)$/.exec(ref.name) || [,ref.name]
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        return {
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          type: m[1],
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          name: m[2],
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          value: ref.value
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        }
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      }),
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      pull.filter(function (ref) {
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        return ref.type == 'heads'
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          && !(ref.name == base && fork.msg.key == repo.id)
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      }),
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      pull.map(function (ref) {
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        var branchLink = u.link([fork.msg.key, 'tree', ref.name], ref.name)
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        var authorLink = u.link([fork.msg.value.author], fork.msg.authorName)
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        var repoLink = u.link([fork.msg.key], fork.msg.repoName)
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        var value = fork.msg.key + ':' + ref.name
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        return '<div class="bgslash">' +
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          '<input type="radio" name="head"' +
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          ' value="' + u.escape(value) + '"' +
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          (query.head == value ? ' checked="checked"' : '') + '> ' +
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          authorLink + ' / ' + repoLink + ' / ' + branchLink + '</div>'
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      })
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    )
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  }
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}
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P.serveRepoComparing = function (req, repo) {
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  var self = this
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  var query = req._u.query
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  var baseBranch = query.base
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  var headRepoId, headBranch
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  if (query.head === 'other') {
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    headRepoId = String(query.other_repo).replace(/^ssb:\/*/, '')
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    headBranch = String(query.other_branch)
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  } else if (query.head) {
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    var s = String(query.head).split(':')
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    headRepoId = s[0]
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    headBranch = s[1]
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  }
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  if (!baseBranch)
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    return self.web.serveRedirect(req, u.encodeLink([repo.id, 'compare']))
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  if (!ssbRef.isMsgId(headRepoId))
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    return self.web.serveError(req, new Error('bad repo id'), 400)
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  var baseLink = u.link([repo.id, 'tree', baseBranch])
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  var headBranchLink = u.link([headRepoId, 'tree', headBranch])
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  var backHref = u.encodeLink([repo.id, 'compare']) + req._u.search
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  var title = req._t(query.expand ? 'OpenPullRequest': 'ComparingChanges')
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  var pageTitle = title + ' · %{author}/%{repo}'
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  return self.repo.renderRepoPage(req, repo, 'pulls', null, pageTitle, cat([
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    pull.once('<h3>' + title + '</h3>'),
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    u.readNext(function (cb) {
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      self.web.getRepo(headRepoId, function (err, headRepo) {
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        if (err) return cb(err)
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        self.web.getRepoFullName(headRepo.feed, headRepo.id,
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          function (err, repoName, authorName) {
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            if (err) return cb(err)
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            cb(null, renderRepoInfo(GitRepo(headRepo), repoName, authorName))
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          }
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        )
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      })
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    })
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  ]))
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  function renderRepoInfo(headRepo, headRepoName, headRepoAuthorName) {
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    var authorLink = u.link([headRepo.feed], headRepoAuthorName)
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    var repoLink = u.link([headRepoId], headRepoName)
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    return cat([
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      pull.once('<section>' +
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        req._t('Base') + ': ' + baseLink + '<br/>' +
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        req._t('Head') + ': ' +
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        '<span class="bgslash">' + authorLink + ' / ' + repoLink +
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        ' / ' + headBranchLink + '</span>' +
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        '</section>' +
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        (query.expand ? '<section><form method="post" action="">' +
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          u.hiddenInputs({
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            action: 'new-pull',
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            branch: baseBranch,
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            head_repo: headRepoId,
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            head_branch: headBranch
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          }) +
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          forms.post(req, repo, null, 8) +
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          '<button type="submit" class="btn open">' +
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            req._t('Create') + '</button>' +
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          '</form></section>'
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        : self.web.isPublic ? ''
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        : '<section><form method="get" action="">' +
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          u.hiddenInputs({
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            base: baseBranch,
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            head: query.head,
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            other_repo: query.other_repo,
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            other_branch: query.other_branch,
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          }) +
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          '<button class="btn open" type="submit" name="expand" value="1">' +
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            '<i>⎇</i> ' + req._t('CreatePullRequest') + '</button> ' +
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          '<a href="' + backHref + '">' + req._t('Back') + '</a>' +
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          '</form></section>') +
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        '<div id="commits"></div>' +
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        '<div class="tab-links">' +
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          '<a href="#" id="files-link">' + req._t('FilesChanged') + '</a> ' +
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          '<a href="#commits" id="commits-link">' +
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            req._t('Commits') + '</a>' +
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        '</div>'),
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      u.readNext(function (cb) {
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        GitRepo.getMergeBase(repo, baseBranch, headRepo, headBranch,
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          function (err, concestor) {
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            if (err) return cb(err)
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            cb(null, cat([
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              pull.once('<section id="files-tab">'),
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              self.repo.renderDiffStat(req, [repo, headRepo],
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                [concestor, headBranch]),
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              pull.once('</section>' +
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                '<section id="commits-tab">'),
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              self.renderCommitLog(req, repo, concestor, headRepo, headBranch),
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              pull.once('</section>')
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            ]))
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          }
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        )
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      })
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    ])
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  }
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}
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P.renderCommitLog = function (req, baseRepo, baseBranch, headRepo, headBranch) {
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  return cat([
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    pull.once('<table class="compare-commits">'),
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    u.readNext(function (cb) {
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      baseRepo.resolveRef(baseBranch, function (err, baseBranchRev) {
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        if (err) return cb(err)
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        var currentDay
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        return cb(null, pull(
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          headRepo.readLog(headBranch),
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          pull.take(function (rev) { return rev != baseBranchRev }),
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          u.pullReverse(),
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          paramap(headRepo.getCommitParsed.bind(headRepo), 8),
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          pull.map(function (commit) {
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            var commitPath = [headRepo.id, 'commit', commit.id]
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            var commitIdShort = '<tt>' + commit.id.substr(0, 8) + '</tt>'
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            var day = Math.floor(commit.author.date / 86400000)
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            var dateRow = day == currentDay ? '' :
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              '<tr><th colspan=3 class="date-info">' +
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              commit.author.date.toLocaleDateString(req._locale) +
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              '</th><tr>'
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            currentDay = day
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            return dateRow + '<tr>' +
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              '<td>' + u.escape(commit.author.name) + '</td>' +
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              '<td>' + u.link(commitPath, commit.title) + '</td>' +
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              '<td>' + u.link(commitPath, commitIdShort, true) + '</td>' +
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              '</tr>'
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          })
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        ))
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      })
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    }),
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    pull.once('</table>')
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  ])
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}
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