module Avo
  class BaseResource
    extend ActiveSupport::DescendantsTracker

    include ActionView::Helpers::UrlHelper
    include Avo::Concerns::HasItems
    include Avo::Concerns::CanReplaceItems
    include Avo::Concerns::HasControls
    include Avo::Concerns::HasStimulusControllers
    include Avo::Concerns::ModelClassConstantized

    # Avo::Current methods
    delegate :context, to: Avo::Current
    delegate :current_user, to: Avo::Current
    delegate :params, to: Avo::Current
    delegate :request, to: Avo::Current
    delegate :view_context, to: Avo::Current

    # view_context methods
    delegate :simple_format, :content_tag, to: :view_context
    delegate :main_app, to: :view_context
    delegate :avo, to: :view_context
    delegate :resource_path, to: :view_context
    delegate :resources_path, to: :view_context

    # I18n methods
    delegate :t, to: ::I18n

    # class methods
    delegate :class_name, to: :class
    delegate :route_key, to: :class
    delegate :singular_route_key, to: :class

    attr_accessor :view
    attr_accessor :reflection
    attr_accessor :user
    attr_accessor :record

    class_attribute :id, default: :id
    class_attribute :title, default: :id
    class_attribute :description, default: :id
    class_attribute :search_query, default: nil
    class_attribute :search_query_help, default: ""
    class_attribute :search_result_path
    class_attribute :includes, default: []
    class_attribute :authorization_policy
    class_attribute :translation_key
    class_attribute :default_view_type, default: :table
    class_attribute :devise_password_optional, default: false
    class_attribute :actions_loader
    class_attribute :scopes_loader
    class_attribute :filters_loader
    class_attribute :grid_loader
    class_attribute :visible_on_sidebar, default: true
    class_attribute :unscoped_queries_on_index, default: false
    class_attribute :index_query
    class_attribute :find_record_method, default: -> {
      query.find id
    }
    class_attribute :hide_from_global_search, default: false
    class_attribute :after_create_path, default: :show
    class_attribute :after_update_path, default: :show
    class_attribute :record_selector, default: true
    class_attribute :keep_filters_panel_open, default: false
    class_attribute :extra_params
    class_attribute :link_to_child_resource, default: false
    class_attribute :map_view

    # EXTRACT:
    class_attribute :ordering

    class << self
      delegate :t, to: ::I18n
      delegate :context, to: ::Avo::Current

      def grid(&block)
        grid_collector = GridCollector.new
        grid_collector.instance_eval(&block)

        self.grid_loader = grid_collector
      end

      def action(action_class, arguments: {})
        self.actions_loader ||= Avo::Loaders::Loader.new

        action = {class: action_class, arguments: arguments}
        self.actions_loader.use action
      end

      def filter(filter_class, arguments: {})
        self.filters_loader ||= Avo::Loaders::Loader.new

        filter = { class: filter_class , arguments: arguments }
        self.filters_loader.use filter
      end

      # This is the search_query scope
      # This should be removed and passed to the search block
      def scope
        query_scope
      end

      def scopes(*args)
        self.scopes_loader ||= Avo::Loaders::Loader.new

        args.each do |scope_class|
          self.scopes_loader.use scope_class
        end
      end

      # This resolves the scope when doing "where" queries (not find queries)
      def query_scope
        final_scope = if index_query.present?
          Avo::ExecutionContext.new(target: index_query, query: model_class).handle
        else
          model_class
        end

        authorization.apply_policy final_scope
      end

      # This resolves the scope when finding records (not "where" queries)
      def find_scope
        authorization.apply_policy model_class
      end

      def authorization
        Avo::Services::AuthorizationService.new Avo::Current.current_user, model_class, policy_class: authorization_policy
      end

      def get_record_associations(record)
        record._reflections
      end

      def valid_association_name(record, association_name)
        get_record_associations(record).keys.find do |name|
          name == association_name
        end
      end

      def valid_attachment_name(record, association_name)
        association_exists = get_record_associations(record).keys.any? do |name|
          name == "#{association_name}_attachment" || name == "#{association_name}_attachments"
        end
        return association_name if association_exists
      end

      def get_available_models
        ApplicationRecord.descendants
      end

      def get_model_by_name(model_name)
        get_available_models.find do |m|
          m.to_s == model_name.to_s
        end
      end

      def class_name
        name.demodulize
      end

      def route_key
        class_name.underscore.pluralize
      end

      def singular_route_key
        route_key.singularize
      end
    end

    delegate :context, to: ::Avo::Current

    def initialize
      detect_fields

      unless self.class.model_class.present?
        if model_class.present? && model_class.respond_to?(:base_class)
          self.class.model_class = model_class.base_class
        end
      end
    end

    def detect_fields
      self.items_holder = Avo::Resources::Items::Holder.new

      # Used in testing to replace items
      if temporary_items.present?
        instance_eval(&temporary_items)
      else
        fields
      end

      self
    end

    def fields
      # blank fields method
    end

    def hydrate(record: nil, view: nil, user: nil, params: nil)
      @view = view if view.present?
      @user = user if user.present?
      @params = params if params.present?

      if record.present?
        @record = record

        hydrate_model_with_default_values if @view == :new
      end

      self
    end

    def get_grid_fields
      return if self.class.grid_loader.blank?

      self.class.grid_loader.hydrate(record: @record, view: @view, resource: self)
    end

    def get_filters
      return [] if self.class.filters_loader.blank?

      self.class.filters_loader.bag
    end

    def get_filter_arguments(filter_class)
      filter = get_filters.find { |filter| filter[:class] == filter_class.constantize }

      filter[:arguments]
    end

    def get_actions
      return [] if self.class.actions_loader.blank?

      self.class.actions_loader.bag
    end

    def get_action_arguments(action_class)
      action = get_actions.find { |action| action[:class].to_s == action_class.to_s }

      action[:arguments]
    end

    def get_scopes
      return [] if self.class.scopes_loader.blank?

      self.class.scopes_loader.bag
    end

    def default_panel_name
      return @params[:related_name].capitalize if @params.present? && @params[:related_name].present?

      case @view
      when :show
        record_title
      when :edit
        record_title
      when :new
        t("avo.create_new_item", item: name.downcase).upcase_first
      end
    end

    def model_class
      # get the model class off of the static property
      return self.class.model_class if self.class.model_class.present?

      # get the model class off of the record
      return @record.base_class if @record.present?

      # generate a model class
      class_name.safe_constantize
    end

    def record_title
      return name if @record.nil?

      the_title = @record.send title
      return the_title if the_title.present?

      @record.id
    rescue
      name
    end

    def resource_description
      return instance_exec(&self.class.description) if self.class.description.respond_to? :call

      # Show the description only on the resource index view.
      # If the user wants to conditionally it on all pages, they should use a block.
      if view == :index
        return self.class.description if self.class.description.is_a? String
      end
    end

    def translation_key
      self.class.translation_key || "avo.resource_translations.#{class_name.underscore}"
    end

    def name
      default = class_name.underscore.humanize

      return @name if @name.present?

      if translation_key
        t(translation_key, count: 1, default: default).capitalize
      else
        default
      end
    end

    def singular_name
      name
    end

    def plural_name
      default = name.pluralize

      if translation_key
        t(translation_key, count: 2, default: default).capitalize
      else
        default
      end
    end

    def underscore_name
      return @name if @name.present?

      self.class.name.demodulize.underscore
    end

    def navigation_label
      plural_name.humanize
    end

    def available_view_types
      view_types = [:table]

      view_types << :grid if get_grid_fields.present?
      view_types << :map if map_view.present?

      view_types
    end

    def attached_file_fields
      get_field_definitions.select do |field|
        [Avo::Fields::FileField, Avo::Fields::FilesField].include? field.class
      end
    end

    def fill_record(record, params, extra_params: [])
      # Map the received params to their actual fields
      fields_by_database_id = get_field_definitions
        .reject do |field|
          field.computed
        end
        .map do |field|
          [field.database_id.to_s, field]
        end
        .to_h

      # Write the field values
      params.each do |key, value|
        field = fields_by_database_id[key]

        next unless field.present?

        record = field.fill_field record, key, value, params
      end

      # Write the user configured extra params to the record
      if extra_params.present?
        # Let Rails fill in the rest of the params
        record.assign_attributes params.permit(extra_params)
      end

      record
    end

    def authorization(user: nil)
      current_user = user || Avo::Current.current_user
      Avo::Services::AuthorizationService.new(current_user, record || model_class, policy_class: authorization_policy)
    end

    def file_hash
      content_to_be_hashed = ""

      # resource file hash
      resource_path = Rails.root.join("app", "avo", "resources", "#{self.class.name.underscore}.rb").to_s
      if File.file? resource_path
        content_to_be_hashed += File.read(resource_path)
      end

      # policy file hash
      policy_path = Rails.root.join("app", "policies", "#{self.class.name.underscore.gsub("_resource", "")}_policy.rb").to_s
      if File.file? policy_path
        content_to_be_hashed += File.read(policy_path)
      end

      Digest::MD5.hexdigest(content_to_be_hashed)
    end

    def cache_hash(parent_record)
      if parent_record.present?
        [record, file_hash, parent_record]
      else
        [record, file_hash]
      end
    end

    # We will not overwrite any attributes that come pre-filled in the record.
    def hydrate_model_with_default_values
      default_values = get_fields
        .select do |field|
          !field.computed
        end
        .map do |field|
          id = field.id
          value = field.value

          if field.type == "belongs_to"
            id = field.foreign_key.to_sym

            reflection = @record._reflections[@params[:via_relation]]

            if field.polymorphic_as.present? && field.types.map(&:to_s).include?(@params[:via_relation_class])
              # set the value to the actual record
              via_resource = Avo::App.resources.get_resource_by_model_class(@params[:via_relation_class])
              value = via_resource.find_record(@params[:via_record_id])
            elsif reflection.present? && reflection.foreign_key.present? && field.id.to_s == @params[:via_relation].to_s
              resource = Avo::App.resources.get_resource_by_model_class params[:via_relation_class]
              record = resource.find_record @params[:via_record_id], params: params
              id_param = reflection.options[:primary_key] || :id

              value = record.send(id_param)
            end
          end

          [id, value]
        end
        .to_h
        .select do |id, value|
          value.present?
        end

      default_values.each do |id, value|
        if @record.send(id).nil?
          @record.send("#{id}=", value)
        end
      end
    end

    # This is used as the model class ID
    # We use this instead of the route_key to maintain compatibility with uncountable models
    # With uncountable models route key appends an _index suffix (Fish->fish_index)
    # Example: User->users, MediaItem->media_items, Fish->fish
    def model_key
      model_class.model_name.plural
    end

    def model_name
      model_class.model_name
    end

    def singular_model_key
      model_class.model_name.singular
    end

    def record_path
      resource_path(record: record, resource: self)
    end

    def records_path
      resources_path(resource: self)
    end

    def label_field
      get_field_definitions.find do |field|
        field.as_label.present?
      end
    rescue
      nil
    end

    def label
      label_field&.value || record_title
    end

    def avatar_field
      get_field_definitions.find do |field|
        field.as_avatar.present?
      end
    rescue
      nil
    end

    def avatar
      return avatar_field.to_image if avatar_field.respond_to? :to_image

      return avatar_field.value.variant(resize_to_limit: [480, 480]) if avatar_field.type == "file"

      avatar_field.value
    rescue
      nil
    end

    def avatar_type
      avatar_field.as_avatar
    rescue
      nil
    end

    def description_field
      get_field_definitions.find do |field|
        field.as_description.present?
      end
    rescue
      nil
    end

    def description
      description_field&.value
    end

    def form_scope
      model_class.base_class.to_s.underscore.downcase
    end

    def has_record_id?
      record.present? && record_id.present?
    end

    def find_record(id, query: nil, params: nil)
      Avo::ExecutionContext.new(
        target: self.class.find_record_method,
        query: query || self.class.find_scope,
        id: id,
        params: params
      ).handle
    end

    def id_attribute
      :id
    end

    def record_id
      record.send(id_attribute)
    end
  end
end