require 'rails_admin/i18n_support'

module RailsAdmin
  module ApplicationHelper

    include RailsAdmin::I18nSupport

    def authorized?(action, abstract_model = nil, object = nil)
      object = nil if object.try :new_record?
      @authorization_adapter.nil? || @authorization_adapter.authorized?(action, abstract_model, object)
    end

    def current_action?(action, abstract_model = @abstract_model, object = @object)
      @action.custom_key == action.custom_key &&
      abstract_model.try(:to_param) == @abstract_model.try(:to_param) &&
      (@object.try(:persisted?) ? @object.id == object.try(:id) : !object.try(:persisted?))
    end

    def action(key, abstract_model = nil, object = nil)
      RailsAdmin::Config::Actions.find(key, { :controller => self.controller, :abstract_model => abstract_model, :object => object })
    end

    def actions(scope = :all, abstract_model = nil, object = nil)
      RailsAdmin::Config::Actions.all(scope, { :controller => self.controller, :abstract_model => abstract_model, :object => object })
    end

    def edit_user_link
      return nil unless authorized?(:edit, _current_user.class, _current_user) && _current_user.respond_to?(:email)
      return nil unless abstract_model = RailsAdmin.config(_current_user.class).abstract_model
      return nil unless edit_action = RailsAdmin::Config::Actions.find(:edit, {:controller => self.controller, :abstract_model => abstract_model, :object => _current_user })
      link_to _current_user.email, url_for(:action => edit_action.action_name, :model_name => abstract_model.to_param, :id => _current_user.id, :controller => 'rails_admin/main')
    end

    def logout_path
      if defined?(Devise)
        scope = Devise::Mapping.find_scope!(_current_user)
        main_app.send("destroy_#{scope}_session_path") rescue false
      end
    end

    def wording_for(label, action = @action, abstract_model = @abstract_model, object = @object)
      model_config = abstract_model.try(:config)
      object = abstract_model && object.is_a?(abstract_model.model) ? object : nil
      action = RailsAdmin::Config::Actions.find(action.to_sym) if (action.is_a?(Symbol) || action.is_a?(String))

      I18n.t("admin.actions.#{action.i18n_key}.#{label}",
        :model_label => model_config.try(:label),
        :model_label_plural => model_config.try(:label_plural),
        :object_label => model_config && object.try(model_config.object_label_method)
      )
    end

    def main_navigation
      nodes_stack = RailsAdmin::Config.visible_models(:controller => self.controller)
      node_model_names = nodes_stack.map{ |c| c.abstract_model.model_name }

      nodes_stack.group_by(&:navigation_label).map do |navigation_label, nodes|

        nodes = nodes.select{ |n| n.parent.nil? || !n.parent.to_s.in?(node_model_names) }
        li_stack = navigation nodes_stack, nodes

        label = navigation_label || t('admin.misc.navigation')
        %{<li class='nav-header'>#{label}</li>#{li_stack}} if li_stack.present?
      end.join.html_safe
    end

    def static_navigation
      li_stack = RailsAdmin::Config.navigation_static_links.map do |title, url|
        content_tag(:li, link_to(title.to_s, url, :target => '_blank'))
      end.join

      label = RailsAdmin::Config.navigation_static_label || t('admin.misc.navigation_static_label')
      li_stack = %{<li class='nav-header'>#{label}</li>#{li_stack}}.html_safe if li_stack.present?
      li_stack
    end

    def navigation nodes_stack, nodes, level=0
      nodes.map do |node|
        model_param = node.abstract_model.to_param
        url         = url_for(:action => :index, :controller => 'rails_admin/main', :model_name => model_param)
        level_class = " nav-level-#{level}" if level > 0
        nav_icon = node.navigation_icon ? %{<i class="#{node.navigation_icon}"></i>}.html_safe : ''

        li = content_tag :li, "data-model"=>model_param do
          link_to nav_icon + node.label_plural, url, :class => "pjax#{level_class}"
        end
        li + navigation(nodes_stack, nodes_stack.select{ |n| n.parent.to_s == node.abstract_model.model_name}, level+1)
      end.join.html_safe
    end

    def breadcrumb action = @action, acc = []
      begin
        (parent_actions ||= []) << action
      end while action.breadcrumb_parent && (action = action(*action.breadcrumb_parent))

      content_tag(:ul, :class => "breadcrumb") do
        parent_actions.map do |a|
          am = a.send(:eval, 'bindings[:abstract_model]')
          o = a.send(:eval, 'bindings[:object]')
          content_tag(:li, :class => current_action?(a, am, o) && "active") do
            crumb = if a.http_methods.include?(:get)
              link_to url_for(:action => a.action_name, :controller => 'rails_admin/main', :model_name => am.try(:to_param), :id => (o.try(:persisted?) && o.try(:id) || nil)), :class => 'pjax' do
                wording_for(:breadcrumb, a, am, o)
              end
            else
              content_tag(:span, wording_for(:breadcrumb, a, am, o))
            end
            crumb+= content_tag(:span, '/', :class => 'divider') unless current_action?(a, am, o)
            crumb
          end
        end.reverse.join().html_safe
      end
    end

    # parent => :root, :collection, :member
    def menu_for(parent, abstract_model = nil, object = nil, only_icon = false) # perf matters here (no action view trickery)
      actions = actions(parent, abstract_model, object).select{ |a| a.http_methods.include?(:get) }
      actions.map do |action|
        wording = wording_for(:menu, action)
        %{
          <li title="#{wording if only_icon}" rel="#{'tooltip' if only_icon}" class="icon #{action.key}_#{parent}_link #{'active' if current_action?(action)}">
            <a class="#{action.pjax? ? 'pjax' : ''}" href="#{url_for({ :action => action.action_name, :controller => 'rails_admin/main', :model_name => abstract_model.try(:to_param), :id => (object.try(:persisted?) && object.try(:id) || nil) })}">
              <i class="#{action.link_icon}"></i>
              <span#{only_icon ? " style='display:none'" : ""}>#{wording}</span>
            </a>
          </li>
        }
      end.join.html_safe
    end

    def bulk_menu abstract_model = @abstract_model
      actions = actions(:bulkable, abstract_model)
      return '' if actions.empty?
      content_tag :li, { :class => 'dropdown', :style => 'float:right' } do
        content_tag(:a, { :class => 'dropdown-toggle', :'data-toggle' => "dropdown", :href => '#' }) { t('admin.misc.bulk_menu_title').html_safe + '<b class="caret"></b>'.html_safe } +
        content_tag(:ul, :class => 'dropdown-menu', :style => 'left:auto; right:0;') do
          actions.map do |action|
            content_tag :li do
              link_to wording_for(:bulk_link, action), '#', :onclick => "jQuery('#bulk_action').val('#{action.action_name}'); jQuery('#bulk_form').submit(); return false;"
            end
          end.join.html_safe
        end
      end.html_safe
    end

  end
end