"use server";

import Fuse, { type IFuseOptions } from "fuse.js";
import axios, { type AxiosResponse } from "axios";

const SEARCH_URL = "https://music.163.com/api/search/get";
const LYRICS_URL = "https://music.163.com/api/song/lyric";

enum LyricSource {
  GENIUS = "Genius",
  LRCLIB = "lrclib.net",
  NETEASE = "NetEase",
}

export interface InternetProviderLyricSearchResponse {
  artist: string;
  id: string;
  name: string;
  score?: number;
  source: LyricSource;
}

interface InternetProviderLyricResponse {
  artist: string;
  id: string;
  lyrics: string;
  name: string;
  source: LyricSource;
}

interface LyricSearchQuery {
  album?: string;
  artist?: string;
  duration?: number;
  name?: string;
}

interface NetEaseResponse {
  code: number;
  result: Result;
}

interface Result {
  hasMore: boolean;
  songCount: number;
  songs: Song[];
}

interface Song {
  album: Album;
  alias: string[];
  artists: Artist[];
  copyrightId: number;
  duration: number;
  fee: number;
  ftype: number;
  id: number;
  mark: number;
  mvid: number;
  name: string;
  rUrl: null;
  rtype: number;
  status: number;
  transNames?: string[];
}

interface Album {
  artist: Artist;
  copyrightId: number;
  id: number;
  mark: number;
  name: string;
  picId: number;
  publishTime: number;
  size: number;
  status: number;
  transNames?: string[];
}

interface Artist {
  albumSize: number;
  alias: any[];
  fansGroup: null;
  id: number;
  img1v1: number;
  img1v1Url: string;
  name: string;
  picId: number;
  picUrl: null;
  trans: null;
}

export async function getSearchResults(
  params: LyricSearchQuery
): Promise<InternetProviderLyricSearchResponse[] | null> {
  let result: AxiosResponse<NetEaseResponse>;

  const searchQuery = [params.artist, params.name].join(" ");

  if (!searchQuery) {
    return null;
  }

  try {
    result = await axios.get(SEARCH_URL, {
      params: {
        limit: 5,
        offset: 0,
        s: searchQuery,
        type: "1",
      },
    });
  } catch (e) {
    console.error("NetEase search request got an error!", e);
    return null;
  }

  const rawSongsResult = result?.data.result?.songs;

  if (!rawSongsResult) return null;

  const songResults: InternetProviderLyricSearchResponse[] = rawSongsResult.map(
    (song) => {
      const artist = song.artists
        ? song.artists.map((artist) => artist.name).join(", ")
        : "";

      return {
        artist,
        id: String(song.id),
        name: song.name,
        source: LyricSource.NETEASE,
      };
    }
  );

  return orderSearchResults({ params, results: songResults });
}

async function getMatchedLyrics(
  params: LyricSearchQuery
): Promise<Omit<InternetProviderLyricResponse, "lyrics"> | null> {
  const results = await getSearchResults(params);

  const firstMatch = results?.[0];

  if (!firstMatch || (firstMatch?.score && firstMatch.score > 0.5)) {
    return null;
  }

  return firstMatch;
}

export async function getLyricsBySongId(
  songId: string
): Promise<string | null> {
  let result: AxiosResponse<any, any>;
  try {
    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment -- debug
    result = await axios.get(LYRICS_URL, {
      params: {
        id: songId,
        kv: "-1",
        lv: "-1",
      },
    });
  } catch (e) {
    console.error("NetEase lyrics request got an error!", e);
    return null;
  }

  // eslint-disable-next-line @typescript-eslint/no-unsafe-return -- ddd
  return result.data.klyric?.lyric || result.data.lrc?.lyric;
}

export async function query(
  params: LyricSearchQuery
): Promise<InternetProviderLyricResponse | null> {
  const lyricsMatch = await getMatchedLyrics(params);
  if (!lyricsMatch) {
    console.error("Could not find the song on NetEase!");
    return null;
  }

  const lyrics = await getLyricsBySongId(lyricsMatch.id);
  if (!lyrics) {
    console.error("Could not get lyrics on NetEase!");
    return null;
  }

  return {
    artist: lyricsMatch.artist,
    id: lyricsMatch.id,
    lyrics,
    name: lyricsMatch.name,
    source: LyricSource.NETEASE,
  };
}

const orderSearchResults = (args: {
  params: LyricSearchQuery;
  results: InternetProviderLyricSearchResponse[];
}): InternetProviderLyricSearchResponse[] => {
  const { params, results } = args;

  const options: IFuseOptions<InternetProviderLyricSearchResponse> = {
    fieldNormWeight: 1,
    includeScore: true,
    keys: [
      { getFn: (song) => song.name, name: "name", weight: 3 },
      { getFn: (song) => song.artist, name: "artist" },
    ],
    threshold: 1.0,
  };

  const fuse = new Fuse(results, options);

  const searchResults = fuse.search<InternetProviderLyricSearchResponse>({
    ...(params.artist && { artist: params.artist }),
    ...(params.name && { name: params.name }),
  });

  return searchResults.map((result) => ({
    ...result.item,
    score: result.score,
  }));
};