Rapidly implement widgets with KentiCopilot

# Featured article widget

## Selection

The widget allows marketers to choose between displaying the most recent published article page, or selecting a specific page to display.
The selector for articles should only be available when a marketer chooses to display a specific page, and should be hidden when they choose the most recent article.

## Presentation options

- Date: Toggle to show or hide the date (`ArticlePagePublishDate`)
- Summary: Toggle to show or hide the article summary (`ArticlePageSummary`)
- Call to action text: Determine the text of the CTA link

## Content retrieval 

- Retrieve the relevant Article columns (`ArticleTitle`, `ArticlePageTeaser`, `ArticlePagePublishDate`, `ArticlePageSummary`) 
- Use the IncludeUrlPath property in RetrievePagesParameters
- Include the linked teaser item
- Use the correct Xperience by Kentico APIs for webpage content retrieval and caching
    - When retrieving pages based on a `ContentItemReference`, do not use `RetrievePagesByGuids`, which requires WebPageItemGuid instead of ContentItemGuid. Instead, use `RetrievePages` with a where condition to specify `ContentItemGuid`, which you can get from the `ContentItemReference`.
- Generate the URL of the linked article
    - Set `IncludeUrlPath` property of `RetrievePagesParameters` to `true`.
    - Include columns required for URL generation with the `UrlPathColumns` extension method

## Styling

- Use the existing Site.css styles to match the design of other components on the site
- Ensure the teaser image fills the full width of the widget's container

## Error handling 

- Missing articles: If selected articles are missing from the database, display a message to the marketer only (not visible in live mode)
- Missing images: If articles have no linked image, display a placeholder image

## Technical requirements

- Use proper caching mechanisms
- Use correct APIs for webpage content retrieval
- Generate URLs correctly for articles and assets
- Follow Xperience by Kentico best practices

/widget-create-research.prompt.md

For the requirements described in featured-article-widget/requirements.md\

/widget-create-implementation.prompt.md

Follow instructions in: CREATION.instructions.md

The widget's error message currently only displays if page builder is in edit mode. It doesn't seem to account for page builder's read-only mode or preview mode.

Could you please make it so the error also displays in preview mode and read-only mode for page builder?

The data retrieval methods here are missing the columns specified in .github/featured-article-widget/requirements.md.

Can you please make sure the ContentRetriever queries also include those ArticlePage columns?

@using DancingGoat.Widgets
@using Kentico.PageBuilder.Web.Mvc

@model DancingGoat.Widgets.FeaturedArticleWidgetViewModel

@{
    var pageBuilderMode = Context.Kentico().PageBuilder().GetMode();
    var isInPreviewMode = Context.Kentico().Preview().Enabled;
    var shouldShowErrorMessage = (pageBuilderMode == PageBuilderMode.Edit 
                                  || pageBuilderMode == PageBuilderMode.ReadOnly 
                                  || isInPreviewMode) 
                                  && !string.IsNullOrEmpty(Model.ErrorMessage);
}

<div class="featured-article-widget">
    @if (shouldShowErrorMessage)
    {
        <div class="alert alert-warning">
            @Model.ErrorMessage
        </div>
    }

    @if (!string.IsNullOrEmpty(Model.ArticleTitle))
    {
        <div class="featured-article-image">
            <img src="@Url.Content(Model.TeaserImageUrl)" alt="@Model.ArticleTitle" style="width: 100%; display: block;" />
        </div>

        <div class="featured-article-content">
            <h2 class="featured-article-title">
                <a href="@Url.Content(Model.ArticleUrl)">@Model.ArticleTitle</a>
            </h2>

            @if (Model.PublishDate.HasValue)
            {
                <div class="featured-article-date">
                    @Model.PublishDate.Value.ToString("MMMM dd, yyyy")
                </div>
            }

            @if (!string.IsNullOrEmpty(Model.Summary))
            {
                <div class="featured-article-summary">
                    @Model.Summary
                </div>
            }

            <div class="featured-article-cta">
                <a href="@Url.Content(Model.ArticleUrl)" class="btn btn-primary">@Model.CallToActionText</a>
            </div>
        </div>
    }
</div>

using System;
using System.Collections.Generic;
using System.ComponentModel;

using CMS.ContentEngine;

using DancingGoat.Models;

using Kentico.PageBuilder.Web.Mvc;
using Kentico.Xperience.Admin.Base.FormAnnotations;

namespace DancingGoat.Widgets
{
    /// <summary>
    /// Featured article widget properties.
    /// </summary>
    public class FeaturedArticleWidgetProperties : IWidgetProperties
    {
        /// <summary>
        /// Article selection mode.
        /// </summary>
        [DropDownComponent(
            Label = "{$dancinggoat.featuredarticlewidget.selectionmode.label$}",
            ExplanationText = "{$dancinggoat.featuredarticlewidget.selectionmode.explanation$}",
            Order = 1,
            Options = "MostRecent;{$dancinggoat.featuredarticlewidget.selectionmode.option.mostrecent$}\nSpecific;{$dancinggoat.featuredarticlewidget.selectionmode.option.specific$}")]
        public string ArticleSelectionMode { get; set; } = nameof(ArticleSelectionModeEnum.MostRecent);


        /// <summary>
        /// Selected article.
        /// </summary>
        [ContentItemSelectorComponent(
            ArticlePage.CONTENT_TYPE_NAME,
            Label = "{$dancinggoat.featuredarticlewidget.selectedarticle.label$}",
            ExplanationText = "{$dancinggoat.featuredarticlewidget.selectedarticle.explanation$}",
            MaximumItems = 1,
            Order = 2)]
        [VisibleIfEqualTo(nameof(ArticleSelectionMode), nameof(ArticleSelectionModeEnum.Specific), StringComparison.OrdinalIgnoreCase)]
        public IEnumerable<ContentItemReference> SelectedArticle { get; set; } = new List<ContentItemReference>();


        /// <summary>
        /// Show article publish date.
        /// </summary>
        [CheckBoxComponent(
            Label = "{$dancinggoat.featuredarticlewidget.showdate.label$}",
            ExplanationText = "{$dancinggoat.featuredarticlewidget.showdate.explanation$}",
            Order = 3)]
        public bool ShowDate { get; set; } = true;


        /// <summary>
        /// Show article summary.
        /// </summary>
        [CheckBoxComponent(
            Label = "{$dancinggoat.featuredarticlewidget.showsummary.label$}",
            ExplanationText = "{$dancinggoat.featuredarticlewidget.showsummary.explanation$}",
            Order = 4)]
        public bool ShowSummary { get; set; } = true;


        /// <summary>
        /// Call to action text.
        /// </summary>
        [TextInputComponent(
            Label = "{$dancinggoat.featuredarticlewidget.ctatext.label$}",
            ExplanationText = "{$dancinggoat.featuredarticlewidget.ctatext.explanation$}",
            Order = 5)]
        public string CallToActionText { get; set; } = "Read more";
    }


    /// <summary>
    /// Article selection mode enum.
    /// </summary>
    public enum ArticleSelectionModeEnum
    {
        /// <summary>
        /// Most recent article.
        /// </summary>
        [Description("Most recent article")]
        MostRecent,


        /// <summary>
        /// Specific article.
        /// </summary>
        [Description("Specific article")]
        Specific
    }
}

using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

using CMS.ContentEngine;
using CMS.DataEngine;
using CMS.Websites;

using DancingGoat.Models;
using DancingGoat.Widgets;

using Kentico.Content.Web.Mvc;
using Kentico.PageBuilder.Web.Mvc;

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ViewComponents;

[assembly: RegisterWidget(
    FeaturedArticleWidgetViewComponent.IDENTIFIER,
    typeof(FeaturedArticleWidgetViewComponent),
    "{$dancinggoat.featuredarticlewidget.title$}",
    typeof(FeaturedArticleWidgetProperties),
    Description = "{$dancinggoat.featuredarticlewidget.description$}",
    IconClass = "icon-newspaper")]

namespace DancingGoat.Widgets
{
    /// <summary>
    /// Controller for featured article widget.
    /// </summary>
    public class FeaturedArticleWidgetViewComponent : ViewComponent
    {
        /// <summary>
        /// Widget identifier.
        /// </summary>
        public const string IDENTIFIER = "DancingGoat.General.FeaturedArticleWidget";

        private const string PLACEHOLDER_IMAGE_PATH = "/Content/Images/404.jpg";

        private readonly IContentRetriever contentRetriever;


        /// <summary>
        /// Creates an instance of <see cref="FeaturedArticleWidgetViewComponent"/> class.
        /// </summary>
        /// <param name="contentRetriever">Content retriever.</param>
        public FeaturedArticleWidgetViewComponent(IContentRetriever contentRetriever)
        {
            this.contentRetriever = contentRetriever;
        }


        public async Task<ViewViewComponentResult> InvokeAsync(FeaturedArticleWidgetProperties properties, CancellationToken cancellationToken)
        {
            ArticlePage article = null;
            string errorMessage = null;

            // Determine which article to retrieve based on selection mode
            if (properties.ArticleSelectionMode == nameof(ArticleSelectionModeEnum.Specific))
            {
                var selectedArticle = properties.SelectedArticle?.FirstOrDefault();
                if (selectedArticle != null)
                {
                    article = await GetArticleByGuid(selectedArticle.Identifier, cancellationToken);
                    if (article == null)
                    {
                        errorMessage = "The selected article could not be found.";
                    }
                }
                else
                {
                    errorMessage = "Please select an article to display.";
                }
            }
            else
            {
                article = await GetMostRecentArticle(cancellationToken);
                if (article == null)
                {
                    errorMessage = "No articles are available to display.";
                }
            }

            var model = BuildViewModel(article, properties, errorMessage);

            return View("~/Components/Widgets/FeaturedArticleWidget/_FeaturedArticleWidget.cshtml", model);
        }


        private async Task<ArticlePage> GetArticleByGuid(Guid contentItemGuid, CancellationToken cancellationToken)
        {
            var articles = await contentRetriever.RetrievePages<ArticlePage>(
                new RetrievePagesParameters
                {
                    IncludeUrlPath = true,
                    LinkedItemsMaxLevel = 1
                },
                query => query
                    .Where(where => where.WhereEquals(nameof(IContentQueryDataContainer.ContentItemGUID), contentItemGuid))
                    .Columns(
                        nameof(ArticlePage.ArticleTitle),
                        nameof(ArticlePage.ArticlePageTeaser),
                        nameof(ArticlePage.ArticlePagePublishDate),
                        nameof(ArticlePage.ArticlePageSummary))
                    .UrlPathColumns(),
                new RetrievalCacheSettings($"WhereEquals_{nameof(IContentQueryDataContainer.ContentItemGUID)}_{contentItemGuid}"),
                cancellationToken
            );

            return articles.FirstOrDefault();
        }


        private async Task<ArticlePage> GetMostRecentArticle(CancellationToken cancellationToken)
        {
            var articles = await contentRetriever.RetrievePages<ArticlePage>(
                new RetrievePagesParameters
                {
                    IncludeUrlPath = true,
                    LinkedItemsMaxLevel = 1
                },
                query => query
                    .OrderBy(OrderByColumn.Desc(nameof(ArticlePage.ArticlePagePublishDate)))
                    .TopN(1)
                    .Columns(
                        nameof(ArticlePage.ArticleTitle),
                        nameof(ArticlePage.ArticlePageTeaser),
                        nameof(ArticlePage.ArticlePagePublishDate),
                        nameof(ArticlePage.ArticlePageSummary))
                    .UrlPathColumns(),
                new RetrievalCacheSettings($"OrderBy_{nameof(ArticlePage.ArticlePagePublishDate)}_{nameof(OrderByColumn.Desc)}_TopN_1"),
                cancellationToken
            );

            return articles.FirstOrDefault();
        }


        private FeaturedArticleWidgetViewModel BuildViewModel(
            ArticlePage article,
            FeaturedArticleWidgetProperties properties,
            string errorMessage)
        {
            var model = new FeaturedArticleWidgetViewModel
            {
                ErrorMessage = errorMessage,
                CallToActionText = !string.IsNullOrWhiteSpace(properties.CallToActionText)
                    ? properties.CallToActionText
                    : "Read more"
            };

            if (article != null)
            {
                model.ArticleTitle = article.ArticleTitle;
                model.ArticleUrl = article.GetUrl()?.RelativePath ?? string.Empty;

                // Get teaser image or use placeholder
                var teaserImage = article.ArticlePageTeaser?.FirstOrDefault();
                model.TeaserImageUrl = teaserImage?.ImageFile?.Url ?? PLACEHOLDER_IMAGE_PATH;

                // Conditionally include date and summary based on widget properties
                if (properties.ShowDate)
                {
                    model.PublishDate = article.ArticlePagePublishDate;
                }

                if (properties.ShowSummary)
                {
                    model.Summary = article.ArticlePageSummary;
                }
            }

            return model;
        }
    }
}

using System;

namespace DancingGoat.Widgets
{
    /// <summary>
    /// View model for featured article widget.
    /// </summary>
    public class FeaturedArticleWidgetViewModel
    {
        /// <summary>
        /// Article title.
        /// </summary>
        public string ArticleTitle { get; set; }


        /// <summary>
        /// Article URL.
        /// </summary>
        public string ArticleUrl { get; set; }


        /// <summary>
        /// Teaser image URL.
        /// </summary>
        public string TeaserImageUrl { get; set; }


        /// <summary>
        /// Article publish date (null if ShowDate is false).
        /// </summary>
        public DateTime? PublishDate { get; set; }


        /// <summary>
        /// Article summary (null/empty if ShowSummary is false).
        /// </summary>
        public string Summary { get; set; }


        /// <summary>
        /// Call to action text.
        /// </summary>
        public string CallToActionText { get; set; }


        /// <summary>
        /// Error message to display in edit mode.
        /// </summary>
        public string ErrorMessage { get; set; }
    }
}