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# Redmine - project management software

# Copyright (C) 2006-2012  Jean-Philippe Lang

# Copyright (C) 2007  Patrick Aljord patcito@ŋmail.com

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'redmine/scm/adapters/git_adapter'

class Repository::Git < Repository

  attr_protected :root_url

  validates_presence_of :url

  def self.human_attribute_name(attribute_key_name, *args)

    attr_name = attribute_key_name.to_s

    if attr_name == "url"

      attr_name = "path_to_repository"

    end

    super(attr_name, *args)

  end

  def self.scm_adapter_class

    Redmine::Scm::Adapters::GitAdapter

  end

  def self.scm_name

    'Git'

  end

  def report_last_commit

    extra_report_last_commit

  end

  def extra_report_last_commit

    return false if extra_info.nil?

    v = extra_info["extra_report_last_commit"]

    return false if v.nil?

    v.to_s != '0'

  end

  def supports_directory_revisions?

    true

  end

  def supports_revision_graph?

    true

  end

  def repo_log_encoding

    'UTF-8'

  end

  # Returns the identifier for the given git changeset

  def self.changeset_identifier(changeset)

    changeset.scmid

  end

  # Returns the readable identifier for the given git changeset

  def self.format_changeset_identifier(changeset)

    changeset.revision[0, 8]

  end

  def branches

    scm.branches

  end

  def tags

    scm.tags

  end

  def default_branch

    scm.default_branch

  rescue Exception => e

    logger.error "git: error during get default branch: #{e.message}"

    nil

  end

  def find_changeset_by_name(name)

    if name.present?

      changesets.where(:revision => name.to_s).first ||

        changesets.where('scmid LIKE ?', "#{name}%").first

    end

  end

  def entries(path=nil, identifier=nil)

    entries = scm.entries(path, identifier, :report_last_commit => extra_report_last_commit)

    load_entries_changesets(entries)

    entries

  end

  # With SCMs that have a sequential commit numbering,

  # such as Subversion and Mercurial,

  # Redmine is able to be clever and only fetch changesets

  # going forward from the most recent one it knows about.

  #

  # However, Git does not have a sequential commit numbering.

  #

  # In order to fetch only new adding revisions,

  # Redmine needs to save "heads".

  #

  # In Git and Mercurial, revisions are not in date order.

  # Redmine Mercurial fixed issues.

  #    * Redmine Takes Too Long On Large Mercurial Repository

  #      http://www.redmine.org/issues/3449

  #    * Sorting for changesets might go wrong on Mercurial repos

  #      http://www.redmine.org/issues/3567

  #

  # Database revision column is text, so Redmine can not sort by revision.

  # Mercurial has revision number, and revision number guarantees revision order.

  # Redmine Mercurial model stored revisions ordered by database id to database.

  # So, Redmine Mercurial model can use correct ordering revisions.

  #

  # Redmine Mercurial adapter uses "hg log -r 0:tip --limit 10"

  # to get limited revisions from old to new.

  # But, Git 1.7.3.4 does not support --reverse with -n or --skip.

  #

  # The repository can still be fully reloaded by calling #clear_changesets

  # before fetching changesets (eg. for offline resync)

  def fetch_changesets

    scm_brs = branches

    return if scm_brs.nil? || scm_brs.empty?

    h1 = extra_info || {}

    h  = h1.dup

    repo_heads = scm_brs.map{ |br| br.scmid }

    h["heads"] ||= []

    prev_db_heads = h["heads"].dup

    if prev_db_heads.empty?

      prev_db_heads += heads_from_branches_hash

    end

    return if prev_db_heads.sort == repo_heads.sort

    h["db_consistent"]  ||= {}

    if changesets.count == 0

      h["db_consistent"]["ordering"] = 1

      merge_extra_info(h)

      self.save

    elsif ! h["db_consistent"].has_key?("ordering")

      h["db_consistent"]["ordering"] = 0

      merge_extra_info(h)

      self.save

    end

    save_revisions(prev_db_heads, repo_heads)

  end

  def save_revisions(prev_db_heads, repo_heads)

    h = {}

    opts = {}

    opts[:reverse]  = true

    opts[:excludes] = prev_db_heads

    opts[:includes] = repo_heads

    revisions = scm.revisions('', nil, nil, opts)

    return if revisions.blank?

    # Make the search for existing revisions in the database in a more sufficient manner

    #

    # Git branch is the reference to the specific revision.

    # Git can *delete* remote branch and *re-push* branch.

    #

    #  $ git push remote :branch

    #  $ git push remote branch

    #

    # After deleting branch, revisions remain in repository until "git gc".

    # On git 1.7.2.3, default pruning date is 2 weeks.

    # So, "git log --not deleted_branch_head_revision" return code is 0.

    #

    # After re-pushing branch, "git log" returns revisions which are saved in database.

    # So, Redmine needs to scan revisions and database every time.

    #

    # This is replacing the one-after-one queries.

    # Find all revisions, that are in the database, and then remove them from the revision array.

    # Then later we won't need any conditions for db existence.

    # Query for several revisions at once, and remove them from the revisions array, if they are there.

    # Do this in chunks, to avoid eventual memory problems (in case of tens of thousands of commits).

    # If there are no revisions (because the original code's algorithm filtered them),

    # then this part will be stepped over.

    # We make queries, just if there is any revision.

    limit = 100

    offset = 0

    revisions_copy = revisions.clone # revisions will change

    while offset < revisions_copy.size

      recent_changesets_slice = changesets.find(

                                     :all,

                                     :conditions => [

                                        'scmid IN (?)',

                                        revisions_copy.slice(offset, limit).map{|x| x.scmid}

                                      ]

                                    )

      # Subtract revisions that redmine already knows about

      recent_revisions = recent_changesets_slice.map{|c| c.scmid}

      revisions.reject!{|r| recent_revisions.include?(r.scmid)}

      offset += limit

    end

    revisions.each do |rev|

      transaction do

        # There is no search in the db for this revision, because above we ensured,

        # that it's not in the db.

        save_revision(rev)

      end

    end

    h["heads"] = repo_heads.dup

    merge_extra_info(h)

    self.save

  end

  private :save_revisions

  def save_revision(rev)

    parents = (rev.parents || []).collect{|rp| find_changeset_by_name(rp)}.compact

    changeset = Changeset.create(

              :repository   => self,

              :revision     => rev.identifier,

              :scmid        => rev.scmid,

              :committer    => rev.author,

              :committed_on => rev.time,

              :comments     => rev.message,

              :parents      => parents

              )

    unless changeset.new_record?

      rev.paths.each { |change| changeset.create_change(change) }

    end

    changeset

  end

  private :save_revision

  def heads_from_branches_hash

    h1 = extra_info || {}

    h  = h1.dup

    h["branches"] ||= {}

    h['branches'].map{|br, hs| hs['last_scmid']}

  end

  def latest_changesets(path,rev,limit=10)

    revisions = scm.revisions(path, nil, rev, :limit => limit, :all => false)

    return [] if revisions.nil? || revisions.empty?

    changesets.find(

      :all,

      :conditions => [

        "scmid IN (?)",

        revisions.map!{|c| c.scmid}

      ],

      :order => 'committed_on DESC'

    )

  end

  def clear_extra_info_of_changesets

    return if extra_info.nil?

    v = extra_info["extra_report_last_commit"]

    write_attribute(:extra_info, nil)

    h = {}

    h["extra_report_last_commit"] = v

    merge_extra_info(h)

    self.save

  end

  private :clear_extra_info_of_changesets

end