import type { Page as CmsPage } from "../types/cms/Page";
import type { HTMLSkeleton } from "../types/cms/Html";
import type { MarkdownSkeleton } from "../types/cms/Markdown";
import type { ComponentIframeSkeleton } from "../types/cms/Iframe";
import type { ImageGallerySkeleton } from "../types/cms/ImageGallery";
import type { ComponentImageSkeleton } from "../types/cms/Image";
import type { QuoteSkeleton } from "../types/cms/Quote";
import type { ComponentYoutubeVideoSkeleton } from "../types/cms/YoutubeVideo";
import type { ComponentHeadlineSkeleton } from "../types/cms/Headline";
import type { Page, ContentItem, ContentRow } from "../types/page";
import { ContentType } from "../types/cms/ContentType.enum";

type ContentEntry =
  | HTMLSkeleton
  | MarkdownSkeleton
  | ComponentIframeSkeleton
  | ImageGallerySkeleton
  | ComponentImageSkeleton
  | QuoteSkeleton
  | ComponentYoutubeVideoSkeleton
  | ComponentHeadlineSkeleton;

/**
 * Mapper für Page-Transformationen
 * Konvertiert CMS-Typen zu unseren Domain-Typen
 */
export class PageMapper {
  /**
   * Strategy Pattern: Map mit Mapper-Funktionen für jeden Content-Type
   */
  private static contentMappers = new Map<
    ContentType,
    (entry: ContentEntry) => ContentItem | null
  >([
    [
      ContentType.html,
      (entry) => {
        const htmlEntry = entry as HTMLSkeleton;
        return {
          type: "html",
          name: htmlEntry.fields.id || "",
          html: htmlEntry.fields.html,
          layout: htmlEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.markdown,
      (entry) => {
        const markdownEntry = entry as MarkdownSkeleton;
        return {
          type: "markdown",
          name: markdownEntry.fields.name,
          content: markdownEntry.fields.content,
          layout: markdownEntry.fields.layout,
          alignment: markdownEntry.fields.alignment,
        };
      },
    ],
    [
      ContentType.iframe,
      (entry) => {
        const iframeEntry = entry as ComponentIframeSkeleton;
        return {
          type: "iframe",
          name: iframeEntry.fields.name,
          content: iframeEntry.fields.content,
          iframe: iframeEntry.fields.iframe,
          overlayImageUrl: iframeEntry.fields.overlayImage?.fields.file.url,
          layout: iframeEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.imgGallery,
      (entry) => {
        const galleryEntry = entry as ImageGallerySkeleton;
        return {
          type: "imageGallery",
          name: galleryEntry.fields.name,
          images: galleryEntry.fields.images.map((img) => ({
            url: img.fields.file.url,
            title: img.fields.title,
            description: img.fields.description,
          })),
          description: galleryEntry.fields.description,
          layout: galleryEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.image,
      (entry) => {
        const imageEntry = entry as ComponentImageSkeleton;
        return {
          type: "image",
          name: imageEntry.fields.name,
          imageUrl: imageEntry.fields.image.fields.file.url,
          caption: imageEntry.fields.caption,
          maxWidth: imageEntry.fields.maxWidth,
          aspectRatio: imageEntry.fields.aspectRatio,
          layout: imageEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.quote,
      (entry) => {
        const quoteEntry = entry as QuoteSkeleton;
        return {
          type: "quote",
          quote: quoteEntry.fields.quote,
          author: quoteEntry.fields.author,
          variant: quoteEntry.fields.variant,
          layout: quoteEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.youtubeVideo,
      (entry) => {
        const videoEntry = entry as ComponentYoutubeVideoSkeleton;
        return {
          type: "youtubeVideo",
          id: videoEntry.fields.id,
          youtubeId: videoEntry.fields.youtubeId,
          params: videoEntry.fields.params,
          title: videoEntry.fields.title,
          description: videoEntry.fields.description,
          layout: videoEntry.fields.layout,
        };
      },
    ],
    [
      ContentType.headline,
      (entry) => {
        const headlineEntry = entry as ComponentHeadlineSkeleton;
        return {
          type: "headline",
          internal: headlineEntry.fields.internal,
          text: headlineEntry.fields.text,
          tag: headlineEntry.fields.tag,
          align: headlineEntry.fields.align,
          layout: headlineEntry.fields.layout,
        };
      },
    ],
  ]);

  /**
   * Mappt ein Contentful Content-Item zu unserem ContentItem
   * Verwendet Strategy Pattern für wartbaren Code
   */
  private static mapContentItem(entry: ContentEntry): ContentItem | null {
    if (!entry.contentTypeId || !entry.fields) {
      return null;
    }

    const mapper = this.contentMappers.get(entry.contentTypeId);
    if (!mapper) {
      return null;
    }

    return mapper(entry);
  }

  /**
   * Mappt eine CMS Content-Row zu unserer ContentRow
   */
  private static mapContentRow(
    content: ContentEntry[],
    justifyContent: string,
    alignItems: string
  ): ContentRow | undefined {
    if (!content || content.length === 0) {
      return undefined;
    }

    const mappedContent = content
      .map((entry) => this.mapContentItem(entry))
      .filter((item): item is ContentItem => item !== null);

    if (mappedContent.length === 0) {
      return undefined;
    }

    return {
      justifyContent: justifyContent as ContentRow["justifyContent"],
      alignItems: alignItems as ContentRow["alignItems"],
      content: mappedContent,
    };
  }

  static fromCms(cmsPage: CmsPage): Page {
    return {
      slug: cmsPage.slug,
      name: cmsPage.name,
      linkName: cmsPage.linkName,
      headline: cmsPage.headline,
      subheadline: cmsPage.subheadline,
      seoTitle: cmsPage.seoTitle,
      seoMetaRobots: cmsPage.seoMetaRobots,
      seoDescription: cmsPage.seoDescription,
      topFullwidthBanner: cmsPage.topFullwidthBanner
        ? {
            name: cmsPage.topFullwidthBanner.fields.name,
            variant: cmsPage.topFullwidthBanner.fields.variant,
            headline: cmsPage.topFullwidthBanner.fields.headline,
            subheadline: cmsPage.topFullwidthBanner.fields.subheadline,
            text: cmsPage.topFullwidthBanner.fields.text,
            imageUrl: cmsPage.topFullwidthBanner.fields.img.fields.file.url,
          }
        : undefined,
      row1: this.mapContentRow(
        cmsPage.row1Content,
        cmsPage.row1JustifyContent,
        cmsPage.row1AlignItems
      ),
      row2: this.mapContentRow(
        cmsPage.row2Content,
        cmsPage.row2JustifyContent,
        cmsPage.row2AlignItems
      ),
      row3: this.mapContentRow(
        cmsPage.row3Content,
        cmsPage.row3JustifyContent,
        cmsPage.row3AlignItems
      ),
    };
  }

  static fromCmsArray(cmsPages: CmsPage[]): Page[] {
    return cmsPages.map((page) => this.fromCms(page));
  }
}