import * as yaml from "@std/yaml";
import { Command } from "@cliffy/command";

import { Hsh } from "../hsh.ts";
import { ensureSuffix } from "../utils.ts";
import { toSnakeCase } from "@std/text/to-snake-case";
import { format } from "@std/datetime/format";

function register(cmd: Command, hsh: Hsh) {
  cmd
    .command("bookmark", "add a bookmark")
    .alias("book")
    .description("manage bookmarks")
    .arguments("<url:string> [path:string]")
    .option("--skip-fetch", "do not fetch the page")
    .action(async ({ skipFetch }, url, path) => {
      const p = path != null ? hsh.parse(path) : hsh.getNotebook().newPath();

      let md = "";
      let title: string | undefined;

      if (!skipFetch) {
        const { Readability } = await import("@mozilla/readability");
        const { DOMParser } = await import("@b-fuze/deno-dom");
        const { default: TurndownService } = await import("turndown");

        const u = new URL(url);
        const content = await (await fetch(u)).text();
        const dom = new DOMParser().parseFromString(content, "text/html");
        const readable = new Readability(dom);
        const parsed = readable.parse();
        if (parsed == null) {
          console.error("WARNING: could not parse the upstream HTML page");
        } else {
          md = new TurndownService().turndown(parsed.content);
          title = dom.title;
        }
      }

      const frontMatter = {
        title,
        type: "bookmark",
        url,
      };

      p.entry = ensureSuffix(
        toSnakeCase(title ?? format(new Date(), "yyyyMMddHHmmss")),
        ".bookmark.md",
      );
      p.write(`---\n${yaml.stringify(frontMatter)}---\n\n${md}`);
      await hsh.emitNotebookChanged?.(p.notebook, `[hsh]: Bookmarked ${url}`);
    });
}

export default { register };