import type {
  // TODO ref backend fetching!!
  Reference,
  Block,
  Inline,
  Media as MediaType,
  ExternalContent,
} from "@/types/trill";
import Icon from "@/components/Icon";
import type { PostProps } from "./Post";
import Media from "./Media";
import JSONContent, { YoutubeSnippet } from "./External";
import { useLocation } from "wouter";
import Quote from "./Quote";
import PostData from "./Loader";
import Card from "./Card.tsx";
import type { Ship } from "@/types/urbit.ts";

function Body(props: PostProps) {
  const text = props.poast.contents.filter((c) => {
    return (
      "paragraph" in c ||
      "blockquote" in c ||
      "heading" in c ||
      "codeblock" in c ||
      "list" in c
    );
  });

  const media: MediaType[] = props.poast.contents.filter(
    (c): c is MediaType => "media" in c,
  );

  const refs = props.poast.contents.filter((c): c is Reference => "ref" in c);
  const json = props.poast.contents.filter(
    (c): c is ExternalContent => "json" in c,
  );

  return (
    <div className="trill-post-body body">
      <div className="body-text">
        {text.map((b, i) => (
          <TextBlock key={JSON.stringify(b) + i} block={b} />
        ))}
      </div>
      {media.length > 0 && <Media media={media} />}
      {refs.map((r, i) => (
        <Ref r={r} nest={props.nest || 0} key={JSON.stringify(r) + i} />
      ))}
      <JSONContent content={json} />
    </div>
  );
}
export default Body;

function TextBlock({ block }: { block: Block }) {
  const key = JSON.stringify(block);
  return "paragraph" in block ? (
    <div className="trill-post-paragraph">
      {block.paragraph.map((i, ind) => (
        <Inlin key={key + ind} i={i} />
      ))}
    </div>
  ) : "blockquote" in block ? (
    <blockquote>
      {block.blockquote.map((i, ind) => (
        <Inlin key={key + ind} i={i} />
      ))}
    </blockquote>
  ) : "heading" in block ? (
    <Heading string={block.heading.text} num={block.heading.num} />
  ) : "codeblock" in block ? (
    <pre>
      <code className={`language-${block.codeblock.lang}`}>
        {block.codeblock.code}
      </code>
    </pre>
  ) : "list" in block ? (
    block.list.ordered ? (
      <ol>
        {block.list.text.map((i, ind) => (
          <li key={JSON.stringify(i) + ind}>
            <Inlin key={key + ind} i={i} />
          </li>
        ))}
      </ol>
    ) : (
      <ul>
        {block.list.text.map((i, ind) => (
          <li key={JSON.stringify(i) + ind}>
            <Inlin key={JSON.stringify(i) + ind} i={i} />
          </li>
        ))}
      </ul>
    )
  ) : null;
}
function Inlin({ i }: { i: Inline }) {
  const [_, navigate] = useLocation();
  function gotoShip(e: React.MouseEvent, ship: Ship) {
    e.stopPropagation();
    navigate(`/feed/${ship}`);
  }
  return "text" in i ? (
    <span>{i.text}</span>
  ) : "italic" in i ? (
    <i>{i.italic}</i>
  ) : "bold" in i ? (
    <strong>{i.bold}</strong>
  ) : "strike" in i ? (
    <span>{i.strike}</span>
  ) : "underline" in i ? (
    <span>{i.underline}</span>
  ) : "sup" in i ? (
    <sup>{i.sup}</sup>
  ) : "sub" in i ? (
    <sub>{i.sub}</sub>
  ) : "ship" in i ? (
    <span
      className="mention"
      role="link"
      onMouseUp={(e) => gotoShip(e, i.ship)}
    >
      {i.ship}
    </span>
  ) : "codespan" in i ? (
    <code>{i.codespan}</code>
  ) : "link" in i ? (
    <LinkParser {...i.link} />
  ) : "break" in i ? (
    <br />
  ) : null;
}

function LinkParser({ href, show }: { href: string; show: string }) {
  const YOUTUBE_REGEX_1 = /(youtube\.com\/watch\?v=)(\w+)/;
  const YOUTUBE_REGEX_2 = /(youtu\.be\/)([a-zA-Z0-9-_]+)/;
  const m1 = href.match(YOUTUBE_REGEX_1);
  const m2 = href.match(YOUTUBE_REGEX_2);
  const ytb = m1 && m1[2] ? m1[2] : m2 && m2[2] ? m2[2] : "";
  return ytb ? (
    <YoutubeSnippet href={href} id={ytb} />
  ) : (
    <a href={href}>{show}</a>
  );
}
function Heading({ string, num }: { string: string; num: number }) {
  return num === 1 ? (
    <h1>{string}</h1>
  ) : num === 2 ? (
    <h2>{string}</h2>
  ) : num === 3 ? (
    <h3>{string}</h3>
  ) : num === 4 ? (
    <h4>{string}</h4>
  ) : num === 5 ? (
    <h5>{string}</h5>
  ) : num === 6 ? (
    <h6>{string}</h6>
  ) : null;
}

function Ref({ r, nest }: { r: Reference; nest: number }) {
  if (r.ref.type === "nostril") {
    const comp = PostData({
      host: r.ref.ship,
      id: r.ref.path.slice(1),
      nest: nest + 1,
      className: "quote-in-post",
    })(Quote);
    return <Card logo="crow">{comp}</Card>;
  }
  return <></>;
}