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# Redmine - project management software

# Copyright (C) 2006-2014  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.

class ScmFetchError < Exception; end

class Repository < ActiveRecord::Base

  include Redmine::Ciphering

  include Redmine::SafeAttributes

  # Maximum length for repository identifiers

  IDENTIFIER_MAX_LENGTH = 255

  belongs_to :project

  has_many :changesets, :order => "#{Changeset.table_name}.committed_on DESC, #{Changeset.table_name}.id DESC"

  has_many :filechanges, :class_name => 'Change', :through => :changesets

  serialize :extra_info

  before_save :check_default

  # Raw SQL to delete changesets and changes in the database

  # has_many :changesets, :dependent => :destroy is too slow for big repositories

  before_destroy :clear_changesets

  validates_length_of :password, :maximum => 255, :allow_nil => true

  validates_length_of :identifier, :maximum => IDENTIFIER_MAX_LENGTH, :allow_blank => true

  validates_presence_of :identifier, :unless => Proc.new { |r| r.is_default? || r.set_as_default? }

  validates_uniqueness_of :identifier, :scope => :project_id, :allow_blank => true

  validates_exclusion_of :identifier, :in => %w(browse show entry raw changes annotate diff statistics graph revisions revision)

  # donwcase letters, digits, dashes, underscores but not digits only

  validates_format_of :identifier, :with => /\A(?!\d+$)[a-z0-9\-_]*\z/, :allow_blank => true

  # Checks if the SCM is enabled when creating a repository

  validate :repo_create_validation, :on => :create

  safe_attributes 'identifier',

    'login',

    'password',

    'path_encoding',

    'log_encoding',

    'is_external',

    'external_url',

    'is_default'

  safe_attributes 'url',

    :if => lambda {|repository, user| repository.new_record?}

  def repo_create_validation

    unless Setting.enabled_scm.include?(self.class.name.demodulize)

      errors.add(:type, :invalid)

    end

  end

  def self.human_attribute_name(attribute_key_name, *args)

    attr_name = attribute_key_name.to_s

    if attr_name == "log_encoding"

      attr_name = "commit_logs_encoding"

    end

    super(attr_name, *args)

  end

  # Removes leading and trailing whitespace

  def url=(arg)

    write_attribute(:url, arg ? arg.to_s.strip : nil)

  end

  # Removes leading and trailing whitespace

  def root_url=(arg)

    write_attribute(:root_url, arg ? arg.to_s.strip : nil)

  end

  def password

    read_ciphered_attribute(:password)

  end

  def password=(arg)

    write_ciphered_attribute(:password, arg)

  end

  def scm_adapter

    self.class.scm_adapter_class

  end

  def scm

    unless @scm

      @scm = self.scm_adapter.new(url, root_url,

                                  login, password, path_encoding)

      if root_url.blank? && @scm.root_url.present?

        update_attribute(:root_url, @scm.root_url)

      end

    end

    @scm

  end

  def scm_name

    self.class.scm_name

  end

  def name

    if identifier.present?

      identifier

    elsif is_default?

      l(:field_repository_is_default)

    else

      scm_name

    end

  end

  def identifier=(identifier)

    super unless identifier_frozen?

  end

  def identifier_frozen?

    errors[:identifier].blank? && !(new_record? || identifier.blank?)

  end

  def identifier_param

    if is_default?

      nil

    elsif identifier.present?

      identifier

    else

      id.to_s

    end

  end

  def <=>(repository)

    if is_default?

      -1

    elsif repository.is_default?

      1

    else

      identifier.to_s <=> repository.identifier.to_s

    end

  end

  def self.find_by_identifier_param(param)

    if param.to_s =~ /^\d+$/

      find_by_id(param)

    else

      find_by_identifier(param)

    end

  end

  # TODO: should return an empty hash instead of nil to avoid many ||{}

  def extra_info

    h = read_attribute(:extra_info)

    h.is_a?(Hash) ? h : nil

  end

  def merge_extra_info(arg)

    h = extra_info || {}

    return h if arg.nil?

    h.merge!(arg)

    write_attribute(:extra_info, h)

  end

  def report_last_commit

    true

  end

  def supports_cat?

    scm.supports_cat?

  end

  def supports_annotate?

    scm.supports_annotate?

  end

  def supports_all_revisions?

    true

  end

  def supports_directory_revisions?

    false

  end

  def supports_revision_graph?

    false

  end

  def entry(path=nil, identifier=nil)

    scm.entry(path, identifier)

  end

  def scm_entries(path=nil, identifier=nil)

    scm.entries(path, identifier)

  end

  protected :scm_entries

  def entries(path=nil, identifier=nil)

    entries = scm_entries(path, identifier)

    load_entries_changesets(entries)

    entries

  end

  def branches

    scm.branches

  end

  def tags

    scm.tags

  end

  def default_branch

    nil

  end

  def properties(path, identifier=nil)

    scm.properties(path, identifier)

  end

  def cat(path, identifier=nil)

    scm.cat(path, identifier)

  end

  def diff(path, rev, rev_to)

    scm.diff(path, rev, rev_to)

  end

  def diff_format_revisions(cs, cs_to, sep=':')

    text = ""

    text << cs_to.format_identifier + sep if cs_to

    text << cs.format_identifier if cs

    text

  end

  # Returns a path relative to the url of the repository

  def relative_path(path)

    path

  end

  # Finds and returns a revision with a number or the beginning of a hash

  def find_changeset_by_name(name)

    return nil if name.blank?

    s = name.to_s

    if s.match(/^\d*$/)

      changesets.where("revision = ?", s).first

    else

      changesets.where("revision LIKE ?", s + '%').first

    end

  end

  def latest_changeset

    @latest_changeset ||= changesets.first

  end

  # Returns the latest changesets for +path+

  # Default behaviour is to search in cached changesets

  def latest_changesets(path, rev, limit=10)

    if path.blank?

      changesets.

        reorder("#{Changeset.table_name}.committed_on DESC, #{Changeset.table_name}.id DESC").

        limit(limit).

        preload(:user).

        all

    else

      filechanges.

        where("path = ?", path.with_leading_slash).

        reorder("#{Changeset.table_name}.committed_on DESC, #{Changeset.table_name}.id DESC").

        limit(limit).

        preload(:changeset => :user).

        collect(&:changeset)

    end

  end

  def scan_changesets_for_issue_ids

    self.changesets.each(&:scan_comment_for_issue_ids)

  end

  # Returns an array of committers usernames and associated user_id

  def committers

    @committers ||= Changeset.connection.select_rows(

         "SELECT DISTINCT committer, user_id FROM #{Changeset.table_name} WHERE repository_id = #{id}")

  end

  # Maps committers username to a user ids

  def committer_ids=(h)

    if h.is_a?(Hash)

      committers.each do |committer, user_id|

        new_user_id = h[committer]

        if new_user_id && (new_user_id.to_i != user_id.to_i)

          new_user_id = (new_user_id.to_i > 0 ? new_user_id.to_i : nil)

          Changeset.where(["repository_id = ? AND committer = ?", id, committer]).

            update_all("user_id = #{new_user_id.nil? ? 'NULL' : new_user_id}")

        end

      end

      @committers            = nil

      @found_committer_users = nil

      true

    else

      false

    end

  end

  # Returns the Redmine User corresponding to the given +committer+

  # It will return nil if the committer is not yet mapped and if no User

  # with the same username or email was found

  def find_committer_user(committer)

    unless committer.blank?

      @found_committer_users ||= {}

      return @found_committer_users[committer] if @found_committer_users.has_key?(committer)

      user = nil

      c = changesets.where(:committer => committer).includes(:user).first

      if c && c.user

        user = c.user

      elsif committer.strip =~ /^([^<]+)(<(.*)>)?$/

        username, email = $1.strip, $3

        u = User.find_by_login(username)

        if u.nil?

          if email.blank?

            if username.strip =~ /^([^ ]+) ([^ ]+)$/

              first, last = $1, $2

              uu = User.where(:firstname => first, :lastname => last)

              if uu.empty? 

                logger.warn "find_committer_user: found no user with name matching #{username}, ignoring"

              elsif uu.length == 1

                u = uu.first

              else

                logger.warn "find_committer_user: found more than one (#{uu.length}) results for user named #{username}, ignoring"

              end

            end

          else

            u = User.find_by_mail(email)

          end

        end

        user = u

      end

      @found_committer_users[committer] = user

      user

    end

  end

  def repo_log_encoding

    encoding = log_encoding.to_s.strip

    encoding.blank? ? 'UTF-8' : encoding

  end

  # Fetches new changesets for all repositories of active projects

  # Can be called periodically by an external script

  # eg. ruby script/runner "Repository.fetch_changesets"

  def self.fetch_changesets

    Project.active.has_module(:repository).all.each do |project|

      project.repositories.each do |repository|

        begin

          repository.fetch_changesets

        rescue Redmine::Scm::Adapters::CommandFailed => e

          logger.error "scm: error during fetching changesets: #{e.message}"

        end

      end

    end

  end

  # scan changeset comments to find related and fixed issues for all repositories

  def self.scan_changesets_for_issue_ids

    all.each(&:scan_changesets_for_issue_ids)

  end

  def self.scm_name

    'Abstract'

  end

  def self.available_scm

    subclasses.collect {|klass| [klass.scm_name, klass.name]}

  end

  def self.factory(klass_name, *args)

    klass = "Repository::#{klass_name}".constantize

    klass.new(*args)

  rescue

    nil

  end

  def clear_cache

    clear_changesets

  end

  def self.scm_adapter_class

    nil

  end

  def self.scm_command

    ret = ""

    begin

      ret = self.scm_adapter_class.client_command if self.scm_adapter_class

    rescue Exception => e

      logger.error "scm: error during get command: #{e.message}"

    end

    ret

  end

  def self.scm_version_string

    ret = ""

    begin

      ret = self.scm_adapter_class.client_version_string if self.scm_adapter_class

    rescue Exception => e

      logger.error "scm: error during get version string: #{e.message}"

    end

    ret

  end

  def self.scm_available

    ret = false

    begin

      ret = self.scm_adapter_class.client_available if self.scm_adapter_class

    rescue Exception => e

      logger.error "scm: error during get scm available: #{e.message}"

    end

    ret

  end

  def set_as_default?

    new_record? && project && Repository.where(:project_id => project.id).empty?

  end

  protected

  def check_default

    if !is_default? && set_as_default?

      self.is_default = true

    end

    if is_default? && is_default_changed?

      Repository.where(["project_id = ?", project_id]).update_all(["is_default = ?", false])

    end

  end

  def load_entries_changesets(entries)

    if entries

      entries.each do |entry|

        if entry.lastrev && entry.lastrev.identifier

          entry.changeset = find_changeset_by_name(entry.lastrev.identifier)

        end

      end

    end

  end

  private

  # Deletes repository data

  def clear_changesets

    cs = Changeset.table_name

    ch = Change.table_name

    ci = "#{table_name_prefix}changesets_issues#{table_name_suffix}"

    cp = "#{table_name_prefix}changeset_parents#{table_name_suffix}"

    connection.delete("DELETE FROM #{ch} WHERE #{ch}.changeset_id IN (SELECT #{cs}.id FROM #{cs} WHERE #{cs}.repository_id = #{id})")

    connection.delete("DELETE FROM #{ci} WHERE #{ci}.changeset_id IN (SELECT #{cs}.id FROM #{cs} WHERE #{cs}.repository_id = #{id})")

    connection.delete("DELETE FROM #{cp} WHERE #{cp}.changeset_id IN (SELECT #{cs}.id FROM #{cs} WHERE #{cs}.repository_id = #{id})")

    connection.delete("DELETE FROM #{cs} WHERE #{cs}.repository_id = #{id}")

    clear_extra_info_of_changesets

  end

  def clear_extra_info_of_changesets

  end

end