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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
//
// SPDX-License-Identifier: Apache-2.0

import type { Extension } from "../../deps/esm.sh/mdast-util-from-markdown/mod.ts";
import type { State } from "../../deps/esm.sh/mdast-util-to-hast/mod.ts";
import type * as Hast from "../../deps/esm.sh/hast/types.ts";
import type * as Mdast from "../../deps/esm.sh/mdast/types.ts";

export interface OfmBlockIdentifier extends Mdast.Node {
	type: "ofmBlockIdentifier";

	/**
	 * Identifier name. This does not include the leading caret.
	 */
	value: string;
}

export function ofmBlockIdentifierFromMarkdown(): Extension {
	return {
		enter: {
			ofmBlockIdentifierIdentifier(token) {
				const ident = this.sliceSerialize(token);

				this.enter(
					{
						type: "ofmBlockIdentifier",
						value: ident,
						data: {
							hName: "span",
							hProperties: {
								id: ident,
							},
						},
					} satisfies OfmBlockIdentifier as unknown as Mdast.Nodes,
					token,
				);
			},
		},
		exit: {
			ofmBlockIdentifierIdentifier(token) {
				this.exit(token);
			},
		},
	};
}

export interface OfmBlockIdentifierToHastHandlersOptions {
	/**
	 * A function takes an identifier string and returns value for `id` attribute.
	 */
	id?(identifier: string): string;
}

export function ofmBlockIdentifierToHastHandlers(
	{ id }: OfmBlockIdentifierToHastHandlersOptions = {},
) {
	return {
		ofmBlockIdentifier(_state: State, node: OfmBlockIdentifier): Hast.Nodes {
			return {
				type: "element",
				tagName: "span",
				properties: {
					id: id ? id(node.value) : node.value,
				},
				children: [],
			};
		},
	};
}