import { BlockNoteEditor } from "../../editor/BlockNoteEditor.js";
import {
  BlockFromConfig,
  createBlockConfig,
  createBlockSpec,
} from "../../schema/index.js";
import { defaultProps, parseDefaultProps } from "../defaultProps.js";
import { parseFigureElement } from "../File/helpers/parse/parseFigureElement.js";
import { createResizableFileBlockWrapper } from "../File/helpers/render/createResizableFileBlockWrapper.js";
import { createFigureWithCaption } from "../File/helpers/toExternalHTML/createFigureWithCaption.js";
import { createLinkWithCaption } from "../File/helpers/toExternalHTML/createLinkWithCaption.js";
import { parseImageElement } from "./parseImageElement.js";

export const FILE_IMAGE_ICON_SVG =
  '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M5 11.1005L7 9.1005L12.5 14.6005L16 11.1005L19 14.1005V5H5V11.1005ZM4 3H20C20.5523 3 21 3.44772 21 4V20C21 20.5523 20.5523 21 20 21H4C3.44772 21 3 20.5523 3 20V4C3 3.44772 3.44772 3 4 3ZM15.5 10C14.6716 10 14 9.32843 14 8.5C14 7.67157 14.6716 7 15.5 7C16.3284 7 17 7.67157 17 8.5C17 9.32843 16.3284 10 15.5 10Z"></path></svg>';

export interface ImageOptions {
  icon?: string;
}

export type ImageBlockConfig = ReturnType<typeof createImageBlockConfig>;

export const createImageBlockConfig = createBlockConfig(
  (_ctx: ImageOptions = {}) =>
    ({
      type: "image" as const,
      propSchema: {
        textAlignment: defaultProps.textAlignment,
        backgroundColor: defaultProps.backgroundColor,
        // File name.
        name: {
          default: "" as const,
        },
        // File url.
        url: {
          default: "" as const,
        },
        // File caption.
        caption: {
          default: "" as const,
        },

        showPreview: {
          default: true,
        },
        // File preview width in px.
        previewWidth: {
          default: undefined,
          type: "number" as const,
        },
      },
      content: "none" as const,
    }) as const,
);

export const imageParse =
  (_config: ImageOptions = {}) =>
  (element: HTMLElement) => {
    if (element.tagName === "IMG") {
      // Ignore if parent figure has already been parsed.
      if (element.closest("figure")) {
        return undefined;
      }

      const { backgroundColor } = parseDefaultProps(element);

      return {
        ...parseImageElement(element as HTMLImageElement),
        backgroundColor,
      };
    }

    if (element.tagName === "FIGURE") {
      const parsedFigure = parseFigureElement(element, "img");
      if (!parsedFigure) {
        return undefined;
      }

      const { targetElement, caption } = parsedFigure;

      const { backgroundColor } = parseDefaultProps(element);

      return {
        ...parseImageElement(targetElement as HTMLImageElement),
        backgroundColor,
        caption,
      };
    }

    return undefined;
  };

export const imageRender =
  (config: ImageOptions = {}) =>
  (
    block: BlockFromConfig<ReturnType<typeof createImageBlockConfig>, any, any>,
    editor: BlockNoteEditor<
      Record<"image", ReturnType<typeof createImageBlockConfig>>,
      any,
      any
    >,
  ) => {
    const icon = document.createElement("div");
    icon.innerHTML = config.icon ?? FILE_IMAGE_ICON_SVG;

    const imageWrapper = document.createElement("div");
    imageWrapper.className = "bn-visual-media-wrapper";

    const image = document.createElement("img");
    image.className = "bn-visual-media";
    if (editor.resolveFileUrl) {
      void editor.resolveFileUrl(block.props.url).then((downloadUrl) => {
        image.src = downloadUrl;
      });
    } else {
      image.src = block.props.url;
    }

    // alt describes image content (per WCAG H86); figcaption (when present)
    // is the contextual caption. Fall back to "" so unlabelled images are
    // marked decorative rather than getting a noisy generic fallback.
    image.alt = block.props.name || "";
    image.contentEditable = "false";
    image.draggable = false;
    if (block.props.previewWidth) {
      image.width = block.props.previewWidth;
    }
    imageWrapper.appendChild(image);

    return createResizableFileBlockWrapper(
      block,
      editor,
      { dom: imageWrapper },
      imageWrapper,
      icon.firstElementChild as HTMLElement,
    );
  };

export const imageToExternalHTML =
  (_config: ImageOptions = {}) =>
  (
    block: BlockFromConfig<ReturnType<typeof createImageBlockConfig>, any, any>,
    _editor: BlockNoteEditor<
      Record<"image", ReturnType<typeof createImageBlockConfig>>,
      any,
      any
    >,
  ) => {
    if (!block.props.url) {
      return {
        dom: document.createElement("img"),
      };
    }

    let image;
    if (block.props.showPreview) {
      image = document.createElement("img");
      image.src = block.props.url;
      image.alt = block.props.name || "";
      if (block.props.previewWidth) {
        image.width = block.props.previewWidth;
      }
    } else {
      image = document.createElement("a");
      image.href = block.props.url;
      image.textContent = block.props.name || block.props.url;
    }

    if (block.props.caption) {
      if (block.props.showPreview) {
        return createFigureWithCaption(image, block.props.caption);
      } else {
        return createLinkWithCaption(image, block.props.caption);
      }
    }

    return {
      dom: image,
    };
  };

export const createImageBlockSpec = createBlockSpec(
  createImageBlockConfig,
  (config) => ({
    meta: {
      fileBlockAccept: ["image/*"],
    },
    parse: imageParse(config),
    render: imageRender(config),
    toExternalHTML: imageToExternalHTML(config),
    runsBefore: ["file"],
  }),
);