class CmAdmin::ResourceController

def apply_scopes(records)
  @current_action.scopes.each do |scope|
    records = records.send(scope)
  end
  records
end

def attachment_fields(model_object)
  model_object.reflect_on_all_associations.map {|reflection|
    next if reflection.options[:polymorphic]
    if reflection.class.name.include?('HasOne')
      reflection.name.to_s.gsub('_attachment', '').gsub('rich_text_', '').to_sym
    elsif reflection.class.name.include?('HasMany')
      Hash[reflection.name.to_s.gsub('_attachments', ''), []]
    end
  }.compact
end

def cm_bulk_action(params)
  @model = Model.find_by({ name: controller_name.classify })
  @bulk_action_processor = CmAdmin::BulkActionProcessor.new(@action, @model, params).perform_bulk_action
  respond_to do |format|
    if @bulk_action_processor.invalid_records.empty?
      format.html { redirect_to request.referrer, notice: "#{@action.name.humanize} is successful" }
    else
      error_messages = @bulk_action_processor.invalid_records.map { |invalid_record|
        "<li>#{invalid_record.error_message}</li>"
      }.join
      format.html { redirect_to request.referrer, alert: "<b>#{@action.name.humanize} is unsuccessful</b><br /><ul>#{error_messages}</ul>" }
    end
  end
end

def cm_create(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'new')
  @ar_object = @model.ar_model.name.classify.constantize.new(resource_params(params))
  resource_identifier
  resource_responder
end

def cm_custom_action_modal(params)
  scoped_model = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve
  @ar_object = fetch_ar_object(scoped_model, params[:id])
  if params[:action_name] == 'destroy'
    render partial: '/layouts/destroy_action_modal', locals: { ar_object: @ar_object }
  else
    custom_action = @model.available_actions.select { |x| x.name == params[:action_name].to_s }.first
    render partial: '/layouts/custom_action_modal', locals: { custom_action:, ar_object: @ar_object }
  end
end

def cm_custom_method(params)
  records = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve
  @current_action = @action
  if  @action.parent == 'index'
    records = apply_scopes(records)
    @ar_object = filter_by(params, records, filter_params: @model.filter_params(params))
  else
    resource_identifier
  end
  respond_to do |format|
    if @action.action_type == :custom
      if @action.child_records
        if request.xhr?
          format.html { render partial: '/cm_admin/main/associated_table' }
        else
          format.html { render @action.layout }
        end
      elsif @action.display_type == :page
        data = @action.parent == "index" ? @ar_object.data : @ar_object
        # TODO: To set a default value for @action.layout, Since it is used in render above,
        # Need to check and fix it.
        format.html { render @action.partial, layout: @action.layout || 'cm_admin' }
      else
        begin
          response_object = @action.code_block.call(@response_object)
          if response_object.class == Hash
            format.json { render json: response_object }
          elsif response_object.errors.empty?
            redirect_url = @model.current_action.redirection_url || @action.redirection_url || request.referrer || "/cm_admin/#{@model.ar_model.table_name}/#{@response_object.id}"
            format.html { redirect_to redirect_url, notice: "#{@action.name.titleize} is successful" }
          else
            error_messages = response_object.errors.full_messages.map{|error_message| "<li>#{error_message}</li>"}.join
            format.html { redirect_to request.referrer, alert: "<b>#{@action.name.titleize} is unsuccessful</b><br /><ul>#{error_messages}</ul>" }
          end
        rescue => exception
          format.html { redirect_to request.referrer, alert: "<div><b>#{@action.name.titleize} is unsuccessful</b><br /><ul><li>#{exception.message}</li></ul></div>" }
        end
      end
    end
  end
end

def cm_destroy(params)
  @ar_object = fetch_ar_object(@model.ar_model.name.classify.constantize, params[:id])
  redirect_url = request.referrer || cm_admin.send("#{@model.name.underscore}_index_path")
  respond_to do |format|
    if @ar_object.destroy
      format.html { redirect_back fallback_location: redirect_url, notice: "#{action_name.titleize} #{@ar_object.class.name.downcase} is successful" }
    else
      format.html { redirect_back fallback_location: redirect_url, notice: "#{action_name.titleize} #{@ar_object.class.name.downcase} is unsuccessful" }
    end
  end
end

def cm_edit(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'edit')
  @ar_object = fetch_ar_object(@model.ar_model.name.classify.constantize, params[:id])
  resource_identifier
  respond_to do |format|
    format.html { render '/cm_admin/main/' + action_name }
  end
end

def cm_history(_params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'history')
  resource_identifier
  respond_to do |format|
    format.html { render '/cm_admin/main/history' }
  end
end

def cm_index(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'index')
  # Based on the params the filter and pagination object to be set
  records = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve
  records = apply_scopes(records)
  if (['table', 'card'].include?(params[:view_type]) || [:table, :card].include?(@current_action.view_type))
    @ar_object = filter_by(params, records, filter_params: @model.filter_params(params))
  elsif (request.xhr? && params[:view_type] == 'kanban') || @current_action.view_type == :kanban
    @ar_object = kanban_filter_by(params, records, @model.filter_params(params))
  else
    @ar_object = filter_by(params, records, filter_params: @model.filter_params(params))
  end
  respond_to do |format|
    if request.xhr? && (params[:view_type] == 'kanban' || @current_action.view_type == :kanban)
      format.json { render json: @ar_object }
    elsif request.xhr?
      format.html { render partial: '/cm_admin/main/table' }
    else
      format.html { render '/cm_admin/main/' + action_name }
    end
  end
end

def cm_new(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'new')
  @ar_object = @model.ar_model.new
  resource_identifier
  respond_to do |format|
    format.html { render '/cm_admin/main/' + action_name }
  end
end

def cm_show(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'show')
  scoped_model = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve
  @ar_object = fetch_ar_object(scoped_model, params[:id])
  resource_identifier
  respond_to do |format|
    if request.xhr?
      format.html { render partial: '/cm_admin/main/show_content', locals: { via_xhr: true } }
    else
      format.html { render '/cm_admin/main/' + action_name }
    end
    format.json { render json: @ar_object.to_builder.target! }
  end
end

def cm_update(params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: 'edit')
  @ar_object = fetch_ar_object(@model.ar_model.name.classify.constantize, params[:id])
  @ar_object.assign_attributes(resource_params(params))
  resource_identifier
  resource_responder
end

def custom_controller_action(action_name, params)
  @current_action = CmAdmin::Models::Action.find_by(@model, name: action_name.to_s)
  return unless @current_action
  @ar_object = fetch_ar_object(@model.ar_model.name.classify.constantize, params[:id])
  return @ar_object unless @current_action.child_records
  child_records = @ar_object.send(@current_action.child_records)
  child_records = apply_scopes(child_records)
  @reflection = @model.ar_model.reflect_on_association(@current_action.child_records)
  @associated_model = if @reflection.klass.column_names.include?('type')
                        CmAdmin::Model.find_by(name: @reflection.plural_name.classify)
                      else
                        CmAdmin::Model.find_by(name: @reflection.klass.name)
                      end
  @associated_ar_object = if child_records.is_a? ActiveRecord::Relation
                            filter_by(params, child_records, parent_record: @ar_object, filter_params: @associated_model.filter_params(params))
                          else
                            child_records
                          end
  return @ar_object, @associated_model, @associated_ar_object
end

def fetch_ar_object(model_object, id)
  return model_object.friendly.find(id) if model_object.respond_to?(:friendly)
  model_object.find(id)
end

def filter_by(params, records, parent_record: nil, filter_params: {}, sort_params: {})
  filtered_result = OpenStruct.new
  cm_model = @associated_model || @model
  db_columns = cm_model.ar_model&.columns&.map{|x| x.name.to_sym}
  if db_columns.include?(@current_action.sort_column)
    sort_column = @current_action.sort_column
  else
    sort_column = 'created_at'
  end
  records = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve if records.nil?
  records = records.order("#{sort_column} #{@current_action.sort_direction}")
  final_data = CmAdmin::Models::Filter.filtered_data(filter_params, records, cm_model.filters)
  pagy, records = pagy(final_data)
  filtered_result.data = records
  filtered_result.pagy = pagy
  filtered_result.parent_record = parent_record
  filtered_result.associated_model = @associated_model.name if @associated_model
  # filtered_result.ar_model =
  # filtered_result.facets = paginate(page, raw_data.size)
  # filtered_result.sort = sort_params
  # filtered_result.facets.sort = sort_params
  return filtered_result
end

def generate_nested_params(nested_table_field)
  if nested_table_field.parent_field
    ar_model = nested_table_field.parent_field.to_s.classify.constantize
    table_name = ar_model.reflections[nested_table_field.field_name.to_s].klass.table_name
  else
    table_name = @model.ar_model.reflections[nested_table_field.field_name.to_s].klass.table_name
  end
  column_names = table_name.to_s.classify.constantize.column_names
  column_names = column_names.map {|column_name| column_name.gsub('_cents', '') }
  column_names = column_names.reject { |column_name| CmAdmin::REJECTABLE_FIELDS.include?(column_name) }.map(&:to_sym) + [:id, :_destroy]
  if nested_table_field.associated_fields
    nested_table_field.associated_fields.each do |associated_field|
      column_names << generate_nested_params(associated_field)
    end
  end
  column_names += attachment_fields(table_name.to_s.classify.constantize)
  Hash[
    "#{table_name}_attributes",
    column_names
  ]
end

def get_nested_table_fields(fields)
  nested_table_fields = []
  fields.each do |field|
    if field.class == CmAdmin::Models::Row
      nested_table_fields += field.sections.map(&:nested_table_fields).flatten
    elsif field.class == CmAdmin::Models::Section
      nested_table_fields += field.nested_table_fields.flatten
    end
  end
  nested_table_fields.flatten
end

def import
  @model = Model.find_by({name: controller_name.classify})
  allowed_params = params.permit(file_import: [:associated_model_name, :import_file]).to_h
  file_import = ::FileImport.new(allowed_params[:file_import])
  file_import.added_by = Current.user
  respond_to do |format|
    if file_import.save!
      format.html { redirect_back fallback_location: cm_admin.send("#{@model.name.underscore}_index_path"), notice: "Your import is successfully queued." }
    end
  end
end

def import_form
  @model = Model.find_by({name: controller_name.classify})
  respond_to do |format|
    format.html { render '/cm_admin/main/import_form' }
  end
end

def kanban_filter_by(params, records, filter_params={}, sort_params={})
  filtered_result = OpenStruct.new
  cm_model = @associated_model || @model
  db_columns = cm_model.ar_model&.columns&.map{|x| x.name.to_sym}
  if db_columns.include?(@current_action.sort_column)
    sort_column = @current_action.sort_column
  else
    sort_column = 'created_at'
  end
  records = "CmAdmin::#{@model.name}Policy::Scope".constantize.new(Current.user, @model.name.constantize).resolve if records.nil?
  # records = records.order("#{sort_column} #{@current_action.sort_direction}")
  final_data = CmAdmin::Models::Filter.filtered_data(filter_params, records, cm_model.filters)
  filtered_result.data = {}
  filtered_result.paging = {}
  filtered_result.paging['next_page'] = true
  group_record_count = final_data.group(params[:kanban_column_name] || @current_action.kanban_attr[:column_name]).count
  per_page = params[:per_page] || 20
  page = params[:page] || 1
  max_page = (group_record_count.values.max.to_i / per_page.to_f).ceil
  filtered_result.paging['next_page'] = (page.to_i < max_page)
  filtered_result.column_count = group_record_count.reject {|key, value| key.blank? }
  column_names = @model.ar_model.send(params[:kanban_column_name]&.pluralize || @current_action.kanban_attr[:column_name].pluralize).keys
  if @current_action.kanban_attr[:only].present?
    column_names &= @current_action.kanban_attr[:only]
  elsif @current_action.kanban_attr[:exclude].present?
    column_names -= @current_action.kanban_attr[:exclude]
  end
  column_names.each do |column|
    total_count = group_record_count[column]
    filtered_result.data[column] = ''
    next if page.to_i > (total_count.to_i / per_page.to_f).ceil
    pagy, records = pagy(final_data.send(column), items: per_page.to_i)
    filtered_result.data[column] = render_to_string partial: 'cm_admin/main/kanban_card', locals: { ar_collection: records}
  end
  filtered_result
end

def resource_identifier
  @ar_object, @associated_model, @associated_ar_object = custom_controller_action(action_name, params.permit!) if !@ar_object.present? && params[:id].present?
  authorize @ar_object, policy_class: "CmAdmin::#{controller_name.classify}Policy".constantize if defined? "CmAdmin::#{controller_name.classify}Policy".constantize
  aar_model = request.url.split('/')[-2].classify.constantize  if params[:aar_id]
  @associated_ar_object = fetch_ar_object(aar_model, params[:aar_id]) if params[:aar_id]
  nested_fields = get_nested_table_fields(@model.available_fields[:new])
  nested_fields += get_nested_table_fields(@model.available_fields[:edit])
  @reflections = @model.ar_model.reflect_on_all_associations
  nested_fields.each do |nested_field|
    table_name = nested_field.field_name
    reflection = @reflections.select {|x| x if x.name == table_name}.first
    if reflection.macro == :has_many
      @ar_object.send(table_name).build if action_name == "new" || action_name == "edit"
    elsif action_name == "new"
      @ar_object.send(('build_' + table_name.to_s).to_sym)
    end
  end
end

def resource_params(params)
  columns = @model.ar_model.columns_hash.map {|key, ar_adapter|
    ar_adapter.sql_type_metadata.sql_type.ends_with?('[]') ? Hash[ar_adapter.name, []] : ar_adapter.name.to_sym
  }
  columns += @model.ar_model.stored_attributes.values.flatten
  permittable_fields = @model.additional_permitted_fields + columns.reject { |i| CmAdmin::REJECTABLE_FIELDS.include?(i) }
  permittable_fields += attachment_fields(@model.ar_model.name.constantize)
  nested_table_fields = get_nested_table_fields(@model.available_fields[:new])
  nested_table_fields += get_nested_table_fields(@model.available_fields[:edit])
  nested_fields = nested_table_fields.uniq.map {|nested_table_field|
    generate_nested_params(nested_table_field)
  }
  permittable_fields += nested_fields
  @model.ar_model.columns.map { |col| permittable_fields << col.name.split('_cents') if col.name.include?('_cents') }
  params.require(@model.name.underscore.to_sym).permit(*permittable_fields)
end

def resource_responder
  respond_to do |format|
    if @ar_object.save
      redirect_url = if params['referrer']
                       params['referrer']
                     elsif @current_action.redirect_to.present?
                       @current_action.redirect_to.call(@ar_object)
                     else
                       cm_admin.send("#{@model.name.underscore}_show_path", @ar_object)
                     end
      if params['attachment_destroy_ids'].present?
        ActiveStorage::Attachment.where(id: params['attachment_destroy_ids']).destroy_all
      end
      format.html { redirect_to redirect_url, allow_other_host: true, notice: "#{action_name.titleize} #{@ar_object.class.name.downcase} is successful" }
    else
      format.html { render '/cm_admin/main/new', notice: "#{action_name.titleize} #{@ar_object.class.name.downcase} is unsuccessful" }
    end
  end
end