import { resources } from "@lib/resources.ts";
import fuzzysort from "npm:fuzzysort";
import { GenericResource } from "@lib/types.ts";
import { extractHashTags } from "@lib/string.ts";
import { getAllMovies, Movie } from "@lib/resource/movies.ts";
import { Article, getAllArticles } from "@lib/resource/articles.ts";
import { getAllRecipes, Recipe } from "@lib/resource/recipes.ts";
import { getAllSeries, Series } from "@lib/resource/series.ts";

type ResourceType = keyof typeof resources;

type SearchParams = {
  q: string;
  types?: string[];
  tags?: string[];
  rating?: number;
  authors?: string[];
};

export function parseResourceUrl(_url: string | URL): SearchParams | undefined {
  try {
    const url = typeof _url === "string" ? new URL(_url) : _url;
    let query = url.searchParams.get("q") || "*";
    if (!query) {
      return undefined;
    }
    query = decodeURIComponent(query);

    const hashTags = extractHashTags(query);

    for (const tag of hashTags) {
      query = query.replace("#" + tag, "");
    }

    return {
      q: query,
      types: url.searchParams.get("type")?.split(",") as ResourceType[] ||
        undefined,
      tags: hashTags,
      rating: url.searchParams.has("rating")
        ? parseInt(url.searchParams.get("rating")!)
        : undefined,
    };
  } catch (_err) {
    return undefined;
  }
}

const isResource = (
  item: Movie | Series | Article | Recipe | boolean,
): item is Movie | Series | Article | Recipe => {
  return !!item;
};

export async function searchResource(
  { q, tags = [], types, rating }: SearchParams,
): Promise<GenericResource[]> {
  const resources = (await Promise.all([
    (!types || types.includes("movie")) && getAllMovies(),
    (!types || types.includes("series")) && getAllSeries(),
    (!types || types.includes("article")) && getAllArticles(),
    (!types || types.includes("recipe")) && getAllRecipes(),
  ])).flat().filter(isResource);

  const results: Record<string, GenericResource> = {};

  for (const resource of resources) {
    if (
      !(resource.id in results) &&
      tags?.length && resource.tags.length &&
      tags.every((t) => resource.tags.includes(t))
    ) {
      results[resource.id] = resource;
    }

    if (
      !(resource.id in results) &&
      rating && resource?.meta?.rating && resource.meta.rating >= rating
    ) {
      results[resource.id] = resource;
    }
  }

  if (q.length && q !== "*") {
    const fuzzyResult = fuzzysort.go(q, resources, {
      keys: ["content", "name", "description", "meta.author"],
      threshold: 0.3,
    });
    for (const result of fuzzyResult) {
      results[result.obj.id] = result.obj;
    }
  }

  return Object.values(results);
}