import { HandlerContext, Handlers } from "$fresh/server.ts";
import {
  createDocument,
  getDocument,
  transformDocument,
} from "@lib/documents.ts";
import { fileExtension } from "https://deno.land/x/file_extension@v2.1.0/mod.ts";
import * as tmdb from "@lib/tmdb.ts";
import { parse, stringify } from "https://deno.land/std@0.194.0/yaml/mod.ts";
import { formatDate, safeFileName } from "@lib/string.ts";
import { json } from "@lib/helpers.ts";
import {
  AccessDeniedError,
  BadRequestError,
  NotFoundError,
} from "@lib/errors.ts";
import { getSeries, Series } from "@lib/resource/series.ts";

async function updateSeriesMetadata(
  name: string,
  metadata: Partial<Series["meta"]>,
) {
  const docId = `Media/series/${name}.md`;

  console.log({ docId, metadata });

  let currentDoc = await getDocument(docId);
  if (!currentDoc) {
    throw new NotFoundError();
  }

  if (!currentDoc.startsWith("---\n---\n")) {
    currentDoc = `---\n---\n\n${currentDoc}`;
  }

  const newDoc = transformDocument(currentDoc, (root) => {
    const frontmatterNode = root.children.find((c) => c.type === "yaml");

    const frontmatter = frontmatterNode?.value as string;

    const value = parse(frontmatter) as Series["meta"];

    const newValue = {
      ...metadata,
      date: formatDate(metadata.date),
      ...value,
    };

    frontmatterNode.value = stringify(newValue);

    return root;
  });

  console.log(newDoc);

  return createDocument(docId, newDoc);
}

const POST = async (
  req: Request,
  ctx: HandlerContext,
): Promise<Response> => {
  const session = ctx.state.session;
  if (!session) {
    throw new AccessDeniedError();
  }

  const body = await req.json();
  const name = ctx.params.name;
  const { tmdbId } = body;
  if (!name || !tmdbId) {
    throw new BadRequestError();
  }

  const series = await getSeries(ctx.params.name);
  if (!series) {
    throw new NotFoundError();
  }

  const seriesDetails = await tmdb.getSeries(tmdbId);
  const seriesCredits = !series.meta.author &&
    await tmdb.getSeriesCredits(tmdbId);

  const releaseDate = seriesDetails.first_air_date;
  const posterPath = seriesDetails.poster_path;
  const director = seriesCredits &&
    seriesCredits.crew?.filter?.((person) => person.job === "Director")[0];

  let finalPath = "";
  if (posterPath && !series.meta.image) {
    const poster = await tmdb.getMoviePoster(posterPath);
    const extension = fileExtension(posterPath);

    finalPath = `Media/series/images/${safeFileName(name)}_cover.${extension}`;
    await createDocument(finalPath, poster);
  }

  const metadata = {} as Series["meta"];
  if (releaseDate) {
    metadata.date = new Date(releaseDate);
  }
  if (finalPath) {
    metadata.image = finalPath;
  }
  if (director && director.name) {
    metadata.author = director.name;
  }

  await updateSeriesMetadata(name, metadata);

  return json(seriesCredits);
};

export const handler: Handlers = {
  POST,
};