module CmAdmin::ViewHelpers::FormHelper

def create_row_inside_section(resource, form_obj, rows)
  rows.each do |row|
    concat(content_tag(:div, class: 'row') do
      row.row_fields.each do |field|
        if field.is_a?(CmAdmin::Models::Section)
          concat set_nested_section_form_fields(resource, form_obj, Array(field))
        else
          concat set_form_field(resource, form_obj, field)
        end
      end
    end)
  end
  nil
end

def create_rows(resource, form_obj, row)
  content_tag :div, class: 'row', **row.html_attrs do
    row.sections.each do |section|
      next unless section.display_if.call(form_obj.object)
      concat create_sections(resource, form_obj, section)
    end
  end
end

def create_sections(resource, form_obj, section)
  content_tag :div, class: 'col form-container' do
    concat content_tag(:p, section.section_name, class: 'form-title') unless section.parent_section.present?
    concat set_form_for_fields(resource, form_obj, section)
  end
end

def extract_query_params(url)
  query_params = {}
  return unless params[:polymorphic_name].present? || params[:associated_id].present? && params[:associated_class].present?
  query_params[:polymorphic_name] = params[:polymorphic_name]
  query_params[:associated_id] = params[:associated_id]
  query_params[:associated_class] = params[:associated_class]
  query_params[:referrer] = params[:referrer] if params[:referrer].present?
  url + '?' + query_params.to_query unless query_params.empty?
end

def form_with_all_fields(resource, method)
  columns = resource.class.columns.dup
  table_name = resource.model_name.collection
  columns.reject! { |i| REJECTABLE.include?(i.name) }
  url = CmAdmin::Engine.mount_path + "/#{table_name}/#{resource.id}"
  set_form_for_fields(resource, columns, url, method)
end

def form_with_mentioned_fields(resource, entities, method)
  # columns = resource.class.columns.select { |i| available_fields.map(&:field_name).include?(i.name.to_sym) }
  table_name = resource.model_name.collection
  # columns.reject! { |i| REJECTABLE.include?(i.name) }
  url = CmAdmin::Engine.mount_path + "/#{table_name}/#{resource.id}"
  set_form_with_sections(resource, entities, url, method)
end

def generate_form(resource, cm_model)
  if resource.new_record?
    action = :new
    method = :post
  else
    action = :edit
    method = :patch
  end
  return form_with_all_fields(resource, method) if cm_model.available_fields[action].empty?
  form_with_mentioned_fields(resource, cm_model.available_fields[action], method)
end

def is_field_presence_validated?(form_obj, field)
  associated_field = form_obj.object.class.reflect_on_all_associations(:belongs_to).reject do |association|
    association.options[:optional] || "#{association.name}_id" != field.field_name.to_s
  end
  form_obj.object._validators[field.field_name].map(&:kind).include?(:presence) || associated_field.present?
end

def set_form_field(resource, form_obj, field)
  return unless field.display_if.call(form_obj.object)
  return create_alert(field, form_obj.object) if field.is_a?(CmAdmin::Models::Alert)
  is_required = is_field_presence_validated?(form_obj, field)
  content_tag(:div, class: field.col_size ? "col-#{field.col_size}" : 'col') do
    if field.input_type.eql?(:hidden)
      concat input_field_for_column(form_obj, field, is_required:)
    else
      concat(content_tag(:div, class: "form-field #{field.disabled ? 'disabled' : ''}") do
        if field.label && %i[check_box switch].exclude?(field.input_type)
          concat form_obj.label field.label, field.label, class: "field-label #{is_required ? 'required-label' : ''}"
          concat tag.br
        end
        concat input_field_for_column(form_obj, field, is_required:)
        concat tag.small field.helper_text, class: 'form-text text-muted' if field.helper_text.present?
        concat tag.p resource.errors[field.field_name].first if resource.errors[field.field_name].present?
      end)
    end
  end
end

def set_form_fields(resource, form_obj, fields)
  fields.each do |field|
    concat(content_tag(:div, class: 'row') do
      concat set_form_field(resource, form_obj, field)
    end)
  end
  nil
end

def set_form_for_fields(resource, form_obj, section)
  content_tag(:div, class: "form-container__inner #{section.parent_section.present? ? 'nested_section' : ''} #{section.html_attrs[:class]}", **section.html_attrs.except(:class)) do
    concat content_tag(:h6, section.section_name, class: 'nested-form-title') if section.parent_section.present?
    concat create_row_inside_section(resource, form_obj, section.rows) if section.rows.present?
    concat set_form_fields(resource, form_obj, section.section_fields)
    concat set_nested_section_form_fields(resource, form_obj, section.nested_sections)
    concat set_nested_form_fields(form_obj, section)
  end
end

def set_form_with_sections(resource, entities, url, method)
  url_with_query_params = extract_query_params(url)
  form_for(resource, url: url_with_query_params || url, method: method, html: { class: "cm_#{resource.class.name.downcase}_form" }) do |form_obj|
    concat form_obj.text_field 'referrer', class: 'normal-input', hidden: true, value: params[:referrer], name: 'referrer' if params[:referrer]
    if params[:polymorphic_name].present?
      concat form_obj.text_field params[:polymorphic_name] + '_type', class: 'normal-input', hidden: true, value: params[:associated_class].classify
      concat form_obj.text_field params[:polymorphic_name] + '_id', class: 'normal-input', hidden: true, value: params[:associated_id]
    elsif params[:associated_class] && params[:associated_id]
      concat form_obj.text_field params[:associated_class] + '_id', class: 'normal-input', hidden: true, value: params[:associated_id]
    end
    concat split_form_into_section(resource, form_obj, entities)
    concat tag.br
    concat form_obj.submit 'Save', class: 'btn-cta', data: { behaviour: 'form_submit', form_class: "cm_#{form_obj.object.class.name.downcase}_form" }
  end
end

def set_nested_form_fields(form_obj, section)
  content_tag(:div) do
    section.nested_table_fields.each do |nested_table_field|
      concat(render(partial: '/cm_admin/main/nested_table_form', locals: { f: form_obj, nested_table_field: nested_table_field }))
    end
  end
end

def set_nested_section_form_fields(resource, form_obj, nested_sections)
  return if nested_sections.blank?
  nested_sections.each do |nested_section|
    next unless nested_section.display_if.call(form_obj.object)
    concat create_sections(resource, form_obj, nested_section)
  end
  nil
end

def split_form_into_section(resource, form_obj, entities)
  content_tag :div do
    entities.each do |entity|
      if entity.class == CmAdmin::Models::Row
        concat create_rows(resource, form_obj, entity)
      elsif entity.class == CmAdmin::Models::Section
        next unless entity.display_if.call(form_obj.object)
        concat(content_tag(:div, class: 'row', **entity.html_attrs) do
          concat create_sections(resource, form_obj, entity)
        end)
      end
    end
  end
end