import { useCallback, useEffect, useState } from 'react';
import { Center, Group } from '@mantine/core';
import { AnimatePresence, motion } from 'framer-motion';
import { ErrorBoundary } from 'react-error-boundary';
import { RiInformationFill } from 'react-icons/ri';
import styled from 'styled-components';
import { useSongLyricsByRemoteId, useSongLyricsBySong } from './queries/lyric-query';
import { SynchronizedLyrics } from './synchronized-lyrics';
import { Spinner, TextTitle } from '/@/renderer/components';
import { ErrorFallback } from '/@/renderer/features/action-required';
import { UnsynchronizedLyrics } from '/@/renderer/features/lyrics/unsynchronized-lyrics';
import { getServerById, useCurrentSong, usePlayerStore } from '/@/renderer/store';
import {
  FullLyricsMetadata,
  LyricsOverride,
  SynchronizedLyricMetadata,
  UnsynchronizedLyricMetadata,
} from '/@/renderer/api/types';
import { LyricsActions } from '/@/renderer/features/lyrics/lyrics-actions';

const ActionsContainer = styled.div`
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 50;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  width: 100%;
  opacity: 0;
  transition: opacity 0.2s ease-in-out;

  &:hover {
    opacity: 1 !important;
  }

  &:focus-within {
    opacity: 1 !important;
  }
`;

const LyricsContainer = styled.div`
  position: relative;
  display: flex;
  width: 100%;
  height: 100%;

  &:hover {
    ${ActionsContainer} {
      opacity: 0.6;
    }
  }
`;

const ScrollContainer = styled(motion.div)`
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  text-align: center;

  mask-image: linear-gradient(
    180deg,
    transparent 5%,
    rgba(0, 0, 0, 100%) 20%,
    rgba(0, 0, 0, 100%) 85%,
    transparent 95%
  );

  &.mantine-ScrollArea-root {
    width: 100%;
    height: 100%;
  }

  & .mantine-ScrollArea-viewport {
    height: 100% !important;
  }

  & .mantine-ScrollArea-viewport > div {
    height: 100%;
  }
`;

function isSynchronized(
  data: Partial<FullLyricsMetadata> | undefined,
): data is SynchronizedLyricMetadata {
  // Type magic. The only difference between Synchronized and Unsynchhronized is
  // the datatype of lyrics. This makes Typescript happier later...
  if (!data) return false;
  return Array.isArray(data.lyrics);
}

export const Lyrics = () => {
  const currentSong = useCurrentSong();
  const currentServer = getServerById(currentSong?.serverId);

  const [clear, setClear] = useState(false);

  const { data, isInitialLoading } = useSongLyricsBySong(
    {
      query: { songId: currentSong?.id || '' },
      serverId: currentServer?.id,
    },
    currentSong,
  );

  const [override, setOverride] = useState<LyricsOverride | undefined>(undefined);

  const handleOnSearchOverride = useCallback((params: LyricsOverride) => {
    setOverride(params);
    setClear(false);
  }, []);

  const { data: overrideLyrics, isInitialLoading: isOverrideLoading } = useSongLyricsByRemoteId({
    options: {
      enabled: !!override,
    },
    query: {
      remoteSongId: override?.id,
      remoteSource: override?.source,
    },
    serverId: currentServer?.id,
  });

  useEffect(() => {
    const unsubSongChange = usePlayerStore.subscribe(
      (state) => state.current.song,
      () => {
        setOverride(undefined);
        setClear(false);
      },
      { equalityFn: (a, b) => a?.id === b?.id },
    );

    return () => {
      unsubSongChange();
    };
  }, []);

  const isLoadingLyrics = isInitialLoading || isOverrideLoading;

  const hasNoLyrics = (!data?.lyrics && !overrideLyrics) || clear;

  const lyricsMetadata:
    | Partial<SynchronizedLyricMetadata>
    | Partial<UnsynchronizedLyricMetadata>
    | undefined = overrideLyrics
    ? {
        artist: override?.artist,
        lyrics: overrideLyrics,
        name: override?.name,
        remote: true,
        source: override?.source,
      }
    : data;

  const isSynchronizedLyrics = isSynchronized(lyricsMetadata);

  return (
    <ErrorBoundary FallbackComponent={ErrorFallback}>
      <LyricsContainer>
        {isLoadingLyrics ? (
          <Spinner
            container
            size={25}
          />
        ) : (
          <AnimatePresence mode="sync">
            {hasNoLyrics ? (
              <Center w="100%">
                <Group>
                  <RiInformationFill size="2rem" />
                  <TextTitle
                    order={3}
                    weight={700}
                  >
                    No lyrics found
                  </TextTitle>
                </Group>
              </Center>
            ) : (
              <ScrollContainer
                animate={{ opacity: 1 }}
                initial={{ opacity: 0 }}
                transition={{ duration: 0.5 }}
              >
                {isSynchronizedLyrics ? (
                  <SynchronizedLyrics {...lyricsMetadata} />
                ) : (
                  <UnsynchronizedLyrics {...(lyricsMetadata as UnsynchronizedLyricMetadata)} />
                )}
              </ScrollContainer>
            )}
          </AnimatePresence>
        )}
        <ActionsContainer>
          <LyricsActions
            onRemoveLyric={() => setClear(true)}
            onSearchOverride={handleOnSearchOverride}
          />
        </ActionsContainer>
      </LyricsContainer>
    </ErrorBoundary>
  );
};