import { Mark } from "@tiptap/core";
import { ParseRule } from "@tiptap/pm/model";
import {
  addStyleAttributes,
  createInternalStyleSpec,
  stylePropsToAttributes,
} from "./internal";
import { StyleConfig, StyleSpec } from "./types";
import {UnreachableCaseError} from "../../util/typescript";

export type CustomStyleImplementation<T extends StyleConfig> = {
  render: T["propSchema"] extends "boolean"
    ? () => {
        dom: HTMLElement;
        contentDOM?: HTMLElement;
      }
    : (value: string) => {
        dom: HTMLElement;
        contentDOM?: HTMLElement;
      };
};

// TODO: support serialization

export function getStyleParseRules(config: StyleConfig): ParseRule[] {
  return [
    {
      tag: `[data-style-type="${config.type}"]`,
      contentElement: (element) => {
        const htmlElement = element as HTMLElement;

        if (htmlElement.matches("[data-editable]")) {
          return htmlElement;
        }

        return htmlElement.querySelector("[data-editable]") || htmlElement;
      },
    },
  ];
}

export function createStyleSpec<T extends StyleConfig>(
  styleConfig: T,
  styleImplementation: CustomStyleImplementation<T>
): StyleSpec<T> {
  const mark = Mark.create({
    name: styleConfig.type,

    addAttributes() {
      return stylePropsToAttributes(styleConfig.propSchema);
    },

    parseHTML() {
      return getStyleParseRules(styleConfig);
    },

    renderHTML({ mark }) {
      let renderResult: {
        dom: HTMLElement;
        contentDOM?: HTMLElement;
      };

      if (styleConfig.propSchema === "boolean") {
        // @ts-ignore not sure why this is complaining
        renderResult = styleImplementation.render();
      } else if (styleConfig.propSchema === "string") {
        renderResult = styleImplementation.render(mark.attrs.stringValue);
      } else {
        throw new UnreachableCaseError(styleConfig.propSchema);
      }

      // const renderResult = styleImplementation.render();
      return addStyleAttributes(
        renderResult,
        styleConfig.type,
        mark.attrs.stringValue,
        styleConfig.propSchema
      );
    },
  });

  return createInternalStyleSpec(styleConfig, {
    mark,
  });
}