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# Redmine - project management software

# Copyright (C) 2006-2011  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)

    attr_name = attribute_key_name

    if attr_name == "url"

      attr_name = "path_to_repository"

    end

    super(attr_name)

  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)

    return nil if name.nil? || name.empty?

    e = changesets.find(:first, :conditions => ['revision = ?', name.to_s])

    return e if e

    changesets.find(:first, :conditions => ['scmid LIKE ?', "#{name}%"])

  end

  def entries(path=nil, identifier=nil)

    scm.entries(path,

                identifier,

                options = {:report_last_commit => extra_report_last_commit})

  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 parse revisions per branch.

  # Branch "last_scmid" is for this requirement.

  #

  # 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

    h["branches"]       ||= {}

    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

    scm_brs.each do |br1|

      br = br1.to_s

      from_scmid = nil

      from_scmid = h["branches"][br]["last_scmid"] if h["branches"][br]

      h["branches"][br] ||= {}

      scm.revisions('', from_scmid, br, {:reverse => true}) do |rev|

        db_rev = find_changeset_by_name(rev.revision)

        transaction do

          if db_rev.nil?

            db_saved_rev = save_revision(rev)

            parents = {}

            parents[db_saved_rev] = rev.parents unless rev.parents.nil?

            parents.each do |ch, chparents|

              ch.parents = chparents.collect{|rp| find_changeset_by_name(rp)}.compact

            end

          end

          h["branches"][br]["last_scmid"] = rev.scmid

          merge_extra_info(h)

          self.save

        end

      end

    end

  end

  def save_revision(rev)

    changeset = Changeset.new(

              :repository   => self,

              :revision     => rev.identifier,

              :scmid        => rev.scmid,

              :committer    => rev.author,

              :committed_on => rev.time,

              :comments     => rev.message

              )

    if changeset.save

      rev.paths.each do |file|

        Change.create(

                  :changeset => changeset,

                  :action    => file[:action],

                  :path      => file[:path])

      end

    end

    changeset

  end

  private :save_revision

  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

end