# frozen_string_literal: true

# Redmine plugin for Document Management System "Features"
#
# Karel Pičman <karel.picman@kontron.com>
#
# This file is part of Redmine DMSF plugin.
#
# Redmine DMSF plugin 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 3 of the License, or (at your option) any
# later version.
#
# Redmine DMSF plugin 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 Redmine DMSF plugin. If not, see
# <https://www.gnu.org/licenses/>.

# Query
class DmsfQuery < Query
  attr_accessor :dmsf_folder_id, :deleted, :sub_projects

  self.queried_class = DmsfFolder
  self.view_permission = :view_dmsf_files

  # Standard columns
  self.available_columns = [
    QueryColumn.new(:id, sortable: 'id', caption: +'#'),
    DmsfQueryTitleColumn.new(:title, sortable: 'title', frozen: true, caption: :label_column_title),
    QueryColumn.new(:size, sortable: 'size', caption: :label_column_size),
    DmsfQueryModifiedColumn.new(:modified, sortable: 'updated', caption: :label_column_modified),
    DmsfQueryVersionColumn.new(:version,
                               sortable: %(major_version minor_version patch_version),
                               caption: :label_column_version),
    QueryColumn.new(:workflow, sortable: 'workflow', caption: :label_column_workflow),
    QueryColumn.new(:author, sortable: %(firstname lastname), caption: :label_column_author),
    QueryColumn.new(:description, sortable: 'description', caption: :label_column_description),
    QueryColumn.new(:comment, sortable: 'comment', caption: :label_column_comment)
  ]

  def initialize(attributes = nil, *_args)
    super(attributes)
    self.sort_criteria = []
    self.filters ||= { 'title' => { operator: '~', values: [''] } }
    self.dmsf_folder_id = nil
    self.deleted = false
    self.sub_projects = false
  end

  ######################################################################################################################
  # Inherited
  #

  def available_columns
    unless @available_columns
      @available_columns = self.class.available_columns.dup
      @available_columns += DmsfFileRevisionCustomField.visible.collect do |cf|
        QueryCustomFieldColumn.new(cf)
      end
    end
    @available_columns
  end

  def groupable_columns
    # TODO: Implement grouping, then remove this method.
    []
  end

  def default_columns_names
    unless @default_column_names
      @default_column_names = []
      columns = available_columns
      columns&.each do |column|
        name = if column.is_a?(QueryCustomFieldColumn)
                 column.custom_field.attributes['name']
               else
                 column.name.to_s
               end
        @default_column_names << column.name if DmsfFolder.column_on?(name)
      end
    end
    @default_column_names
  end

  def default_sort_criteria
    [%w[title ASC]]
  end

  def base_scope
    @scope ||= [dmsf_folders_scope, dmsf_folder_links_scope, dmsf_projects_scope, dmsf_files_scope,
                dmsf_file_links_scope, dmsf_url_links_scope].compact.inject(:union_all)
    @scope
  end

  # Returns the count of all items
  def dmsf_count
    # We cannot use this due to the permissions
    # base_scope.where(statement).count
    dmsf_nodes.size
  rescue ::ActiveRecord::StatementInvalid => e
    raise StatementInvalid, e.message
  end

  def initialize_available_filters
    add_available_filter 'author', type: :list, values: -> { author_values }
    add_available_filter 'title', type: :text
    add_available_filter 'updated', type: :date_past
    add_available_filter 'locked', type: :list, values: [[l(:general_text_yes), '1'], [l(:general_text_no), '0']]
    add_available_filter 'workflow', type: :list, values: [
      [l(:title_waiting_for_approval), '1'],
      [l(:title_approved), '2'],
      [l(:title_assigned), '3'],
      [l(:title_rejected), '4'],
      [l(:title_obsolete), '5']
    ]
    add_custom_fields_filters DmsfFileRevisionCustomField.visible
  end

  def statement
    unless @statement
      filters_clauses = []
      filters.each_key do |field|
        v = values_for(field).clone
        next if v.blank?

        operator = operator_for(field)
        case field
        when 'author'
          v.push(User.current.id.to_s) if v.delete('me')
        when 'title'
          next if (operator == '~') && v.join.empty?
        end
        if field =~ /cf_(\d+)$/
          # custom field
          available_filters # Initialize available filters #1380
          sql_cf = +sql_for_custom_field(field, operator, v, Regexp.last_match(1))
          # This is what we get
          #  SELECT ct.id FROM dmsf_folders ct LEFT OUTER JOIN custom_values ON custom_values.customized_type='DmsfFolder' AND custom_values.customized_id=ct.id AND custom_values.custom_field_id=78 WHERE dmsf_folders.id = ct.id AND   (custom_values.value IN ('A')) AND (1=1))
          # This is what we need
          #  SELECT customized_id FROM custom_values WHERE customized_type=dmsf_folder.customized_type AND custom_values.customized_id=dmsf_folders.customized_id AND custom_field_id=78 AND custom_values.value IN ('A')))
          sql_cf.gsub! ' AND (1=1)', ''
          sql_cf.gsub!(
            "SELECT ct.id FROM dmsf_folders ct LEFT OUTER JOIN custom_values ON custom_values.customized_type='DmsfFolder' AND custom_values.customized_id=ct.id AND custom_values.custom_field_id=",
            'SELECT custom_values.customized_id FROM custom_values WHERE custom_values.customized_type=dmsf_folders.customized_type AND custom_values.customized_id=dmsf_folders.customized_id AND custom_values.custom_field_id='
          )
          sql_cf.gsub! 'WHERE dmsf_folders.id = ct.id AND   (', 'AND '
          sql_cf.gsub!(/\)$/, '')
          filters_clauses << sql_cf
        else
          filters_clauses << "(#{sql_for_field(field, operator, v, queried_table_name, field)})"
        end
      end
      filters_clauses.compact_blank!
      @statement = filters_clauses.any? ? filters_clauses.join(' AND ') : nil
    end
    @statement
  end

  def validate_query_filters
    # Skip validation for empty title (default filter)
    filter = filters.delete('title')
    super
    # Add it back
    filters['title'] = filter if filter
  end

  def columns
    cols = super
    # Just move the optional column Id to the beginning as it isn't frozen
    id_index = cols.index { |col| col.name == :id }
    if id_index == 1
      id_col = cols.delete_at(id_index)
      cols.insert 0, id_col
    end
    cols
  end

  ######################################################################################################################
  # New

  def dmsf_nodes(options = {})
    order_option = ['sort', group_by_sort_order, options[:order] || sort_clause&.first].flatten.compact_blank
    if order_option.size > 1
      DmsfFileRevisionCustomField.visible.pluck(:id).each do |id|
        order_option[1].gsub! "cf_#{id}.value", "cf_#{id}"
      end
      if order_option[1] =~ /^(firstname|major_version),? (lastname|minor_version)( patch_version)? (DESC|ASC)$/
        order_option[1] = if Regexp.last_match(3).present?
                            "#{Regexp.last_match(1)} #{Regexp.last_match(4)}, #{Regexp.last_match(2)}
                             #{Regexp.last_match(4)}, #{Regexp.last_match(3)} #{Regexp.last_match(4)}"
                          else
                            "#{Regexp.last_match(1)} #{Regexp.last_match(4)}, #{Regexp.last_match(2)}
                             #{Regexp.last_match(4)}"
                          end
      end
    end
    items = case ActiveRecord::Base.connection.adapter_name.downcase
            when /sqlserver/i
              # This is just a workaround for #1352.
              # limit and offset cause an error in case of MS SQL
              base_scope.where(statement).order order_option
            else
              base_scope.where(statement).order(order_option).limit(options[:limit]).offset options[:offset]
            end.to_a
    fo = filters_on?
    items.delete_if do |item|
      case item.type
      when 'project'
        prj = Project.find_by(id: item.id)
        !prj&.dmsf_available?
      when 'folder'
        dmsf_folder = DmsfFolder.find_by(id: item.id)
        !DmsfFolder.permissions?(dmsf_folder, allow_system: false)
      when 'file'
        if fo
          dmsf_file = DmsfFile.find_by(id: item.id)
          if dmsf_file.dmsf_folder
            !DmsfFolder.permissions?(dmsf_file.dmsf_folder, allow_system: false)
          else
            !dmsf_file.project.dmsf_available?
          end
        else
          false
        end
      when /link$/
        if fo
          dmsf_link = DmsfLink.find_by(id: item.id)
          if dmsf_link.dmsf_folder
            !dmsf_link.dmsf_folder.visible? || !DmsfFolder.permissions?(dmsf_link.dmsf_folder, allow_system: false)
          else
            !dmsf_link.project&.dmsf_available?
          end
        else
          false
        end
      end
    end
    items
  end

  def extra_columns
    []
  end

  def self.default(project = nil, user = User.current)
    # User's default
    if user&.logged? && (query_id = user.pref.default_dmsf_query).present?
      query = find_by(id: query_id)
      return query if query&.visible?
    end

    # Project's default
    project = project[:project] if project.is_a?(Hash)
    query = project&.default_dmsf_query
    return query if query&.visibility == VISIBILITY_PUBLIC

    # Global default
    query = find_by(id: RedmineDmsf.dmsf_default_query)
    return query if query&.visibility == VISIBILITY_PUBLIC

    nil
  end

  private

  def filters_on?
    filters.each_key do |field|
      return true if values_for(field).any?(&:present?)
    end
    false
  end

  def sub_query
    case ActiveRecord::Base.connection.adapter_name.downcase
    when /sqlserver/i
      'dmsf_file_revisions.id = (SELECT TOP 1 r.id FROM dmsf_file_revisions r
       WHERE r.created_at = (SELECT MAX(created_at) FROM dmsf_file_revisions rr WHERE rr.dmsf_file_id = dmsf_files.id)
       AND r.dmsf_file_id = dmsf_files.id ORDER BY id DESC)'
    else
      'dmsf_file_revisions.id = (SELECT r.id FROM dmsf_file_revisions r WHERE r.created_at = (SELECT MAX(created_at)
       FROM dmsf_file_revisions rr WHERE rr.dmsf_file_id = dmsf_files.id) AND r.dmsf_file_id = dmsf_files.id ORDER BY id
       DESC LIMIT 1)'
    end
  end

  def integer_type
    if Redmine::Database.mysql?
      ActiveRecord::Base.connection.type_to_sql(:signed)
    else
      ActiveRecord::Base.connection.type_to_sql(:integer)
    end
  end

  def now
    case ActiveRecord::Base.connection.adapter_name.downcase
    when /sqlserver/i
      'GETDATE()'
    when /sqlite/i
      "datetime('now')"
    else
      'NOW()'
    end
  end

  def get_cf_query(id, type, table)
    aggr_func = Redmine::Database.mysql? || Redmine::Database.sqlite? ? 'GROUP_CONCAT(value)' : "STRING_AGG(value, ',')"
    ",(SELECT #{aggr_func} FROM custom_values WHERE custom_field_id = #{id} AND customized_type = '#{type}' AND
     customized_id = #{table}.id GROUP BY custom_field_id) AS cf_#{id}"
  end

  def dmsf_projects_scope
    return nil unless sub_projects

    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << ",NULL AS cf_#{id}"
    end
    scope = Project.select(%{
        projects.id AS id,
        projects.id AS project_id,
        CAST(NULL AS #{integer_type}) AS revision_id,
        projects.name AS title,
        projects.identifier AS filename,
        CAST(NULL AS #{integer_type}) AS size,
        projects.updated_on AS updated,
        CAST(NULL AS #{integer_type}) AS major_version,
        CAST(NULL AS #{integer_type}) AS minor_version,
        CAST(NULL AS #{integer_type}) AS patch_version,
        CAST(NULL AS #{integer_type}) AS workflow,
        CAST(NULL AS #{integer_type}) AS workflow_id,
        '' AS firstname,
        '' AS lastname,
        CAST(NULL AS #{integer_type}) AS author,
        'project' AS type,
        CAST(0 AS #{integer_type}) AS deleted,
        '' AS customized_type,
        0 AS customized_id,
        projects.description AS description,
        '' AS comment,
        0 AS locked,
        0 AS "system",
        0 AS sort#{cf_columns}}).visible
    if dmsf_folder_id || deleted
      scope.none
    else
      scope = scope.non_templates if scope.respond_to?(:non_templates)
      if project.nil? && filters_on?
        scope
      else
        scope.where projects: { parent_id: project&.id }
      end
    end
  end

  def dmsf_folders_scope
    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << get_cf_query(id, 'DmsfFolder', 'dmsf_folders')
    end
    scope = DmsfFolder.select(%{
        dmsf_folders.id AS id,
        dmsf_folders.project_id AS project_id,
        CAST(NULL AS #{integer_type}) AS revision_id,
        dmsf_folders.title AS title,
        NULL AS filename,
        CAST(NULL AS #{integer_type}) AS size,
        dmsf_folders.updated_at AS updated,
        CAST(NULL AS #{integer_type}) AS major_version,
        CAST(NULL AS #{integer_type}) AS minor_version,
        CAST(NULL AS #{integer_type}) AS patch_version,
        CAST(NULL AS #{integer_type}) AS workflow,
        CAST(NULL AS #{integer_type}) AS workflow_id,
        users.firstname AS firstname,
        users.lastname AS lastname,
        users.id AS author,
        'folder' AS type,
        dmsf_folders.deleted AS deleted,
        'DmsfFolder' AS customized_type,
        dmsf_folders.id AS customized_id,
        dmsf_folders.description AS description,
        '' AS comment,
        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
        (CASE WHEN (dmsf_folders.system = #{ActiveRecord::Base.connection.quoted_true}) THEN 1 ELSE 0 END) AS "system",
        1 AS sort#{cf_columns}})
                      .joins('LEFT JOIN users ON dmsf_folders.user_id = users.id')
                      .joins("LEFT JOIN dmsf_locks ON dmsf_folders.id = dmsf_locks.entity_id AND
                              dmsf_locks.entity_type = 1 AND (dmsf_locks.expires_at IS NULL
                              OR dmsf_locks.expires_at > #{now})")
    scope = deleted ? scope.deleted : scope.visible
    if dmsf_folder_id
      scope.where dmsf_folders: { dmsf_folder_id: dmsf_folder_id }
    elsif project.nil? && filters_on?
      scope
    elsif statement.present? || deleted
      scope.where dmsf_folders: { project_id: project&.id }
    else
      scope.where dmsf_folders: { project_id: project&.id, dmsf_folder_id: nil }
    end
  end

  def dmsf_folder_links_scope
    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << get_cf_query(id, 'DmsfFolder', 'dmsf_folders')
    end
    scope = DmsfLink.select(%{
        dmsf_links.id AS id,
        dmsf_links.target_project_id AS project_id,
        dmsf_links.target_id AS revision_id,
        dmsf_links.name AS title,
        dmsf_folders.title AS filename,
        CAST(NULL AS #{integer_type}) AS size,
        COALESCE(dmsf_folders.updated_at, dmsf_links.updated_at) AS updated,
        CAST(NULL AS #{integer_type}) AS major_version,
        CAST(NULL AS #{integer_type}) AS minor_version,
        CAST(NULL AS #{integer_type}) AS patch_version,
        CAST(NULL AS #{integer_type}) AS workflow,
        CAST(NULL AS #{integer_type}) AS workflow_id,
        users.firstname AS firstname,
        users.lastname AS lastname,
        users.id AS author,
        'folder-link' AS type,
        dmsf_links.deleted AS deleted,
        'DmsfFolder' AS customized_type,
        dmsf_folders.id AS customized_id,
        dmsf_folders.description AS description,
        '' AS comment,
        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
        0 AS "system",
        1 AS sort#{cf_columns}})
                    .joins('LEFT JOIN dmsf_folders ON dmsf_links.target_id = dmsf_folders.id')
                    .joins('LEFT JOIN users ON users.id = COALESCE(dmsf_folders.user_id, dmsf_links.user_id)')
                    .joins("LEFT JOIN dmsf_locks ON dmsf_folders.id = dmsf_locks.entity_id AND
                            dmsf_locks.entity_type = 1 AND (dmsf_locks.expires_at IS NULL OR
                            dmsf_locks.expires_at > #{now})")
    scope = deleted ? scope.deleted : scope.visible
    if dmsf_folder_id
      scope.where dmsf_links: { target_type: 'DmsfFolder', dmsf_folder_id: dmsf_folder_id }
    elsif project.nil? && filters_on?
      scope
    elsif statement.present? || deleted
      scope.where dmsf_links: { target_type: 'DmsfFolder', project_id: project&.id }
    else
      scope.where dmsf_links: { target_type: 'DmsfFolder', project_id: project&.id, dmsf_folder_id: nil }
    end
  end

  def dmsf_files_scope
    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << get_cf_query(id, 'DmsfFileRevision', 'dmsf_file_revisions')
    end
    scope = DmsfFile.select(%{
        dmsf_files.id AS id,
        dmsf_files.project_id AS project_id,
        dmsf_file_revisions.id AS revision_id,
        dmsf_file_revisions.title AS title,
        dmsf_file_revisions.name AS filename,
        dmsf_file_revisions.size AS size,
        dmsf_file_revisions.updated_at AS updated,
        dmsf_file_revisions.major_version AS major_version,
        dmsf_file_revisions.minor_version AS minor_version,
        dmsf_file_revisions.patch_version AS patch_version,
        dmsf_file_revisions.workflow AS workflow,
        dmsf_file_revisions.dmsf_workflow_id AS workflow_id,
        users.firstname AS firstname,
        users.lastname AS lastname,
        users.id AS author,
        'file' AS type,
        dmsf_files.deleted AS deleted,
        'DmsfFileRevision' AS customized_type,
        dmsf_file_revisions.id AS customized_id,
        dmsf_file_revisions.description AS description,
        dmsf_file_revisions.comment AS comment,
        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
        0 AS "system",
        2 AS sort#{cf_columns}})
                    .joins(:dmsf_file_revisions)
                    .joins('LEFT JOIN users ON dmsf_file_revisions.user_id = users.id ')
                    .joins("LEFT JOIN dmsf_locks ON dmsf_files.id = dmsf_locks.entity_id AND dmsf_locks.entity_type = 0
                            AND (dmsf_locks.expires_at IS NULL OR dmsf_locks.expires_at > #{now})")
                    .where(sub_query)
    scope = deleted ? scope.deleted : scope.visible
    if dmsf_folder_id
      scope.where dmsf_files: { dmsf_folder_id: dmsf_folder_id }
    elsif project.nil? && filters_on?
      scope
    elsif statement.present? || deleted
      scope.where dmsf_files: { project_id: project&.id }
    else
      scope.where(dmsf_files: { project_id: project&.id, dmsf_folder_id: nil })
    end
  end

  def dmsf_file_links_scope
    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << get_cf_query(id, 'DmsfFileRevision', 'dmsf_file_revisions')
    end
    scope = DmsfLink.select(%{
        dmsf_links.id AS id,
        dmsf_files.project_id AS project_id,
        dmsf_files.id AS revision_id,
        dmsf_links.name AS title,
        dmsf_file_revisions.name AS filename,
        dmsf_file_revisions.size AS size,
        dmsf_file_revisions.updated_at AS updated,
        dmsf_file_revisions.major_version AS major_version,
        dmsf_file_revisions.minor_version AS minor_version,
        dmsf_file_revisions.patch_version AS patch_version,
        dmsf_file_revisions.workflow AS workflow,
        dmsf_file_revisions.dmsf_workflow_id AS workflow_id,
        users.firstname AS firstname,
        users.lastname AS lastname,
        users.id AS author,
        'file-link' AS type,
        dmsf_links.deleted AS deleted,
        'DmsfFileRevision' AS customized_type,
        dmsf_file_revisions.id AS customized_id,
        dmsf_file_revisions.description AS description,
        dmsf_file_revisions.comment AS comment,
        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
        0 AS "system",
        2 AS sort#{cf_columns}})
                    .joins('JOIN dmsf_files ON dmsf_files.id = dmsf_links.target_id')
                    .joins('JOIN dmsf_file_revisions ON dmsf_file_revisions.dmsf_file_id = dmsf_files.id')
                    .joins('LEFT JOIN users ON dmsf_file_revisions.user_id = users.id ')
                    .joins("LEFT JOIN dmsf_locks ON dmsf_files.id = dmsf_locks.entity_id AND dmsf_locks.entity_type = 0
                            AND (dmsf_locks.expires_at IS NULL OR dmsf_locks.expires_at > #{now})")
                    .where(sub_query)
    scope = deleted ? scope.deleted : scope.visible
    if dmsf_folder_id
      scope.where dmsf_links: { target_type: 'DmsfFile', dmsf_folder_id: dmsf_folder_id }
    elsif project.nil? && filters_on?
      scope
    elsif statement.present? || deleted
      scope.where dmsf_links: { target_type: 'DmsfFile', project_id: project&.id }
    else
      scope.where dmsf_links: { target_type: 'DmsfFile', project_id: project&.id, dmsf_folder_id: nil }
    end
  end

  def dmsf_url_links_scope
    cf_columns = +''
    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
      cf_columns << ",NULL AS cf_#{id}"
    end
    scope = DmsfLink.select(%{
        dmsf_links.id AS id,
        dmsf_links.project_id AS project_id,
        CAST(NULL AS #{integer_type}) AS revision_id,
        dmsf_links.name AS title,
        dmsf_links.external_url AS filename,
        CAST(NULL AS #{integer_type}) AS size,
        dmsf_links.updated_at AS updated,
        CAST(NULL AS #{integer_type}) AS major_version,
        CAST(NULL AS #{integer_type}) AS minor_version,
        CAST(NULL AS #{integer_type}) AS patch_version,
        CAST(NULL AS #{integer_type}) AS workflow,
        CAST(NULL AS #{integer_type}) AS workflow_id,
        users.firstname AS firstname,
        users.lastname AS lastname,
        users.id AS author,
        'url-link' AS type,
        dmsf_links.deleted AS deleted,
        '' AS customized_type,
        0 AS customized_id,
        '' AS description,
        '' AS comment,
        0 AS locked,
        0 AS "system",
        2 AS sort#{cf_columns}})
                    .joins('LEFT JOIN users ON dmsf_links.user_id = users.id ')
    scope = deleted ? scope.deleted : scope.visible
    if dmsf_folder_id
      scope.where dmsf_links: { target_type: 'DmsfUrl', dmsf_folder_id: dmsf_folder_id }
    elsif project.nil? && filters_on?
      scope
    elsif statement.present? || deleted
      scope.where dmsf_links: { target_type: 'DmsfUrl', project_id: project&.id }
    else
      scope.where dmsf_links: { target_type: 'DmsfUrl', project_id: project&.id, dmsf_folder_id: nil }
    end
  end
end
