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# Redmine - project management software

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

#

# 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/darcs_adapter'

class Repository::Darcs < Repository

  validates_presence_of :url, :log_encoding

  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::DarcsAdapter

  end

  def self.scm_name

    'Darcs'

  end

  def supports_directory_revisions?

    true

  end

  def entry(path=nil, identifier=nil)

    patch = identifier.nil? ? nil : changesets.find_by_revision(identifier)

    scm.entry(path, patch.nil? ? nil : patch.scmid)

  end

  def entries(path=nil, identifier=nil)

    patch = nil

    if ! identifier.nil?

      patch = changesets.find_by_revision(identifier)

      return nil if patch.nil?

    end

    entries = scm.entries(path, patch.nil? ? nil : patch.scmid)

    if entries

      entries.each do |entry|

        # Search the DB for the entry's last change

        if entry.lastrev && !entry.lastrev.scmid.blank?

          changeset = changesets.find_by_scmid(entry.lastrev.scmid)

        end

        if changeset

          entry.lastrev.identifier = changeset.revision

          entry.lastrev.name       = changeset.revision

          entry.lastrev.time       = changeset.committed_on

          entry.lastrev.author     = changeset.committer

        end

      end

    end

    load_entries_changesets(entries)

    entries

  end

  def cat(path, identifier=nil)

    patch = identifier.nil? ? nil : changesets.find_by_revision(identifier.to_s)

    scm.cat(path, patch.nil? ? nil : patch.scmid)

  end

  def diff(path, rev, rev_to)

    patch_from = changesets.find_by_revision(rev)

    return nil if patch_from.nil?

    patch_to = changesets.find_by_revision(rev_to) if rev_to

    if path.blank?

      path = patch_from.filechanges.collect{|change| change.path}.join(' ')

    end

    patch_from ? scm.diff(path, patch_from.scmid, patch_to ? patch_to.scmid : nil) : nil

  end

  def fetch_changesets

    scm_info = scm.info

    if scm_info

      db_last_id = latest_changeset ? latest_changeset.scmid : nil

      next_rev   = latest_changeset ? latest_changeset.revision.to_i + 1 : 1

      # latest revision in the repository

      scm_revision = scm_info.lastrev.scmid

      unless changesets.find_by_scmid(scm_revision)

        revisions = scm.revisions('', db_last_id, nil, :with_path => true)

        transaction do

          revisions.reverse_each do |revision|

            changeset = Changeset.create(:repository   => self,

                                         :revision     => next_rev,

                                         :scmid        => revision.scmid,

                                         :committer    => revision.author,

                                         :committed_on => revision.time,

                                         :comments     => revision.message)

            revision.paths.each do |change|

              changeset.create_change(change)

            end

            next_rev += 1

          end if revisions

        end

      end

    end

  end

end