import { useRef, useState, type DragEvent } from 'react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';

import {
  SOUND_EVENTS,
  SOUND_LIMIT_PER_KIND,
  SOUND_MAX_BYTES,
  deleteGuildSound,
  fetchGuildSounds,
  guildSoundsQueryKey,
  isAllowedSoundType,
  isValidSoundName,
  renameGuildSound,
  uploadGuildSound,
  type GuildSound,
  type SoundEvent,
  type SoundKind,
} from '@/api/sounds';
import { ErrorNotice } from '@/components/ui/ErrorNotice';
import { Field } from '@/components/ui/Field';
import { Modal } from '@/components/ui/Modal';
import { Badge, Button } from '@/components/ui/primitives';
import { SkeletonLines } from '@/components/ui/Skeleton';
import { formatBytes } from '@/lib/format';
import { useSessionStore } from '@/stores/session';
import { SettingsSection } from '@/pages/settings/SettingsSection';

interface GuildSoundsSectionProps {
  guildId: string;
}

/**
 * Локальная ошибка проверки: текст показываем сразу, на сервер не ходим.
 * Ключ перевода — как у серверных ошибок (`errors.<code>`).
 */
type LocalError =
  | { kind: 'file.too_large' }
  | { kind: 'sound.invalid_type' }
  | { kind: 'sound.invalid_name' }
  | { kind: 'sounds.event_required' };

/** Названия событий палитры: подписи берём из локалей. */
function eventLabelKey(event: SoundEvent): string {
  return `settings.servers.sounds.events.${event}`;
}

/**
 * «Звуки»: саундборд и звуковая палитра сервера (AGENT.md 7.13, право
 * MANAGE_SOUNDS). Список читается по REST, а снапшот обновляется точечно —
 * и загрузкой, и событием шлюза `GUILD_SOUNDS_UPDATE`.
 */
export function GuildSoundsSection({ guildId }: GuildSoundsSectionProps) {
  const { t, i18n } = useTranslation();
  const queryClient = useQueryClient();
  const [kind, setKind] = useState<SoundKind>('soundboard');
  const [name, setName] = useState('');
  const [emoji, setEmoji] = useState('');
  const [event, setEvent] = useState<SoundEvent>('member_join');
  const [file, setFile] = useState<File | null>(null);
  const [localError, setLocalError] = useState<LocalError | null>(null);
  const [dragging, setDragging] = useState(false);
  const [renaming, setRenaming] = useState<GuildSound | null>(null);
  const [renameValue, setRenameValue] = useState('');
  const [removing, setRemoving] = useState<GuildSound | null>(null);
  const fileInputRef = useRef<HTMLInputElement | null>(null);

  const list = useQuery({
    queryKey: guildSoundsQueryKey(guildId),
    queryFn: ({ signal }) => fetchGuildSounds(guildId, undefined, signal),
    retry: 0,
  });

  const sounds = list.data ?? [];
  const soundboard = sounds.filter((sound) => sound.kind === 'soundboard');
  const palette = sounds.filter((sound) => sound.kind === 'ui');
  const current = kind === 'soundboard' ? soundboard : palette;
  const full = current.length >= SOUND_LIMIT_PER_KIND;

  /** Инвалидация кэша: снапшот придёт событием шлюза либо правкой стора. */
  const refresh = (): void => {
    void queryClient.invalidateQueries({ queryKey: guildSoundsQueryKey(guildId) });
  };

  const upload = useMutation({
    mutationFn: (input: {
      name: string;
      file: File;
      kind: SoundKind;
      event?: SoundEvent;
      emoji?: string;
    }) => uploadGuildSound(guildId, input.kind, input),
    onSuccess: (sound) => {
      if (sound !== null) {
        useSessionStore.getState().upsertGuildSound(guildId, sound);
      }
      setName('');
      setEmoji('');
      setFile(null);
      setLocalError(null);
      refresh();
    },
  });

  const rename = useMutation({
    mutationFn: (input: { soundId: string; name: string; emoji?: string }) =>
      renameGuildSound(guildId, input.soundId, {
        name: input.name,
        ...(input.emoji === undefined || input.emoji === '' ? {} : { emoji: input.emoji }),
      }),
    onSuccess: (sound) => {
      if (sound !== null) {
        useSessionStore.getState().upsertGuildSound(guildId, sound);
      }
      setRenaming(null);
      refresh();
    },
  });

  const remove = useMutation({
    mutationFn: (soundId: string) => deleteGuildSound(guildId, soundId),
    onSuccess: (_result, soundId) => {
      useSessionStore.getState().removeGuildSound(guildId, soundId);
      setRemoving(null);
      refresh();
    },
  });

  /** Проверки на клиенте: формат, размер и имя — до запроса на сервер. */
  const pickFile = (next: File | undefined): void => {
    if (next === undefined) {
      return;
    }
    upload.reset();
    if (!isAllowedSoundType(next)) {
      setFile(null);
      setLocalError({ kind: 'sound.invalid_type' });
      return;
    }
    if (next.size > SOUND_MAX_BYTES) {
      setFile(null);
      setLocalError({ kind: 'file.too_large' });
      return;
    }
    setLocalError(null);
    setFile(next);
  };

  const submit = (): void => {
    if (file === null) {
      setLocalError({ kind: 'sound.invalid_type' });
      return;
    }
    if (!isValidSoundName(name)) {
      setLocalError({ kind: 'sound.invalid_name' });
      return;
    }
    setLocalError(null);
    upload.mutate({
      name,
      file,
      kind,
      ...(kind === 'ui' ? { event } : {}),
      ...(emoji.trim() === '' ? {} : { emoji: emoji.trim() }),
    });
  };

  const onDrop = (event_: DragEvent<HTMLDivElement>): void => {
    event_.preventDefault();
    setDragging(false);
    pickFile(event_.dataTransfer.files[0]);
  };

  /** Строка списка: имя, событие, эмодзи, переименование и удаление. */
  const renderRow = (sound: GuildSound) => (
    <li
      key={sound.id}
      data-testid={`guild-sound-${sound.id}`}
      className="flex items-center gap-3 rounded-[var(--radius-md)] px-2 py-1.5 transition-colors duration-[var(--duration-fast)] hover:bg-surface-2"
    >
      <span aria-hidden="true" className="w-6 shrink-0 text-center">
        {sound.emoji ?? '🎵'}
      </span>
      <span className="min-w-0 flex-1 truncate text-sm">{sound.name}</span>
      {sound.event === undefined ? null : <Badge>{t(eventLabelKey(sound.event))}</Badge>}
      <Button
        variant="ghost"
        aria-label={t('settings.servers.sounds.renameLabel', { name: sound.name })}
        onClick={() => {
          rename.reset();
          setRenameValue(sound.name);
          setRenaming(sound);
        }}
      >
        {t('settings.servers.sounds.rename')}
      </Button>
      <Button
        variant="ghost"
        className="border-danger/50 text-danger"
        aria-label={t('settings.servers.sounds.deleteLabel', { name: sound.name })}
        onClick={() => {
          remove.reset();
          setRemoving(sound);
        }}
      >
        {t('settings.servers.sounds.delete')}
      </Button>
    </li>
  );

  return (
    <SettingsSection
      title={t('settings.servers.sounds.title')}
      description={t('settings.servers.sounds.description', { limit: SOUND_LIMIT_PER_KIND })}
    >
      <div className="mt-3 flex flex-wrap items-center gap-2">
        {(['soundboard', 'ui'] as SoundKind[]).map((item) => (
          <button
            key={item}
            type="button"
            aria-pressed={kind === item}
            data-testid={`guild-sounds-tab-${item}`}
            onClick={() => setKind(item)}
            className={`rounded-[var(--radius-sm)] px-2 py-1 text-sm transition-colors duration-[var(--duration-fast)] ${
              kind === item
                ? 'bg-surface-3 text-fg'
                : 'text-fg-muted hover:bg-surface-2 hover:text-fg'
            }`}
          >
            {/* Счётчик вида прямо в переключателе: «Саундборд · 2 из 30». */}
            {t(`settings.servers.sounds.kinds.${item}`)}
            {' · '}
            {t('settings.servers.sounds.counter', {
              count: item === 'soundboard' ? soundboard.length : palette.length,
              limit: SOUND_LIMIT_PER_KIND,
            })}
          </button>
        ))}
      </div>

      <p className="mt-2 text-sm text-fg-muted" data-testid="guild-sounds-counter">
        {t('settings.servers.sounds.counter', {
          count: current.length,
          limit: SOUND_LIMIT_PER_KIND,
        })}
      </p>

      {list.isPending ? (
        <SkeletonLines className="mt-4" rows={3} />
      ) : list.isError ? (
        <ErrorNotice className="mt-4" error={list.error} onRetry={() => void list.refetch()} />
      ) : current.length === 0 ? (
        <p className="mt-4 text-sm text-fg-muted">{t('settings.servers.sounds.empty')}</p>
      ) : (
        <ul className="gl-stagger mt-4 flex flex-col gap-1" data-testid="guild-sounds">
          {current.map(renderRow)}
        </ul>
      )}

      {remove.isError ? <ErrorNotice className="mt-3" error={remove.error} /> : null}

      <div className="mt-5 flex flex-col gap-3 border-t border-border/40 pt-4">
        <h3 className="text-sm font-semibold">{t('settings.servers.sounds.uploadTitle')}</h3>
        <p className="text-xs text-fg-muted">
          {t('settings.servers.sounds.uploadHint', {
            limit: formatBytes(SOUND_MAX_BYTES, i18n.language),
          })}
        </p>
        {full ? <p className="text-xs text-warning">{t('errors.sounds.limit_reached')}</p> : null}

        <Field
          label={t('settings.servers.sounds.name')}
          name="sound_name"
          value={name}
          maxLength={32}
          placeholder={t('settings.servers.sounds.namePlaceholder')}
          hint={t('settings.servers.sounds.nameHint')}
          onChange={(event_) => setName(event_.target.value)}
        />

        <Field
          label={t('settings.servers.sounds.emoji')}
          name="sound_emoji"
          value={emoji}
          maxLength={8}
          placeholder={t('settings.servers.sounds.emojiPlaceholder')}
          hint={t('settings.servers.sounds.emojiHint')}
          onChange={(event_) => setEmoji(event_.target.value)}
        />

        {kind !== 'ui' ? null : (
          <label className="flex flex-col gap-1">
            <span className="text-xs font-semibold uppercase text-fg-muted">
              {t('settings.servers.sounds.event')}
            </span>
            <select
              value={event}
              aria-label={t('settings.servers.sounds.event')}
              data-testid="guild-sounds-event"
              onChange={(event_) => setEvent(event_.target.value as SoundEvent)}
              className="rounded-[var(--radius-sm)] border border-border/60 bg-surface-1 px-2 py-1.5 text-sm"
            >
              {SOUND_EVENTS.map((item) => (
                <option key={item} value={item}>
                  {t(eventLabelKey(item))}
                </option>
              ))}
            </select>
          </label>
        )}

        <div
          onDragOver={(event_) => {
            event_.preventDefault();
            setDragging(true);
          }}
          onDragLeave={() => setDragging(false)}
          onDrop={onDrop}
          className={`flex flex-wrap items-center gap-3 rounded-[var(--radius-md)] border border-dashed px-3 py-2 text-sm transition-colors duration-[var(--duration-fast)] ${
            dragging ? 'border-accent bg-accent/10' : 'border-border/60 bg-surface-2/40'
          }`}
          data-testid="sound-dropzone"
        >
          <span className="text-fg-muted">{t('settings.servers.sounds.dropHint')}</span>
          <input
            ref={fileInputRef}
            type="file"
            hidden
            accept="audio/mpeg,audio/ogg,audio/wav,audio/webm,audio/mp4,.mp3,.ogg,.wav,.webm,.m4a"
            aria-label={t('settings.servers.sounds.file')}
            onChange={(event_) => {
              pickFile(event_.target.files?.[0]);
              event_.target.value = '';
            }}
          />
          <Button variant="ghost" onClick={() => fileInputRef.current?.click()}>
            {t('settings.servers.sounds.chooseFile')}
          </Button>
          {file === null ? null : (
            <span className="text-xs text-fg-muted">
              {t('settings.servers.sounds.fileSelected', {
                name: file.name,
                size: formatBytes(file.size, i18n.language),
              })}
            </span>
          )}
        </div>

        {localError === null ? null : (
          <p role="alert" className="text-xs text-danger">
            {t(`errors.${localError.kind}`)}
          </p>
        )}
        {upload.isError ? <ErrorNotice error={upload.error} /> : null}

        <div className="flex justify-end">
          <Button
            disabled={upload.isPending || file === null || name.trim() === '' || full}
            onClick={submit}
          >
            {t(
              upload.isPending
                ? 'settings.servers.sounds.uploading'
                : 'settings.servers.sounds.upload',
            )}
          </Button>
        </div>
      </div>

      <Modal
        open={renaming !== null}
        title={t('settings.servers.sounds.renameTitle')}
        onClose={() => setRenaming(null)}
        footer={
          <>
            <Button variant="ghost" onClick={() => setRenaming(null)}>
              {t('common.cancel')}
            </Button>
            <Button
              disabled={rename.isPending || !isValidSoundName(renameValue.trim())}
              onClick={() => {
                if (renaming !== null) {
                  rename.mutate({ soundId: renaming.id, name: renameValue.trim() });
                }
              }}
            >
              {t(rename.isPending ? 'common.saving' : 'common.save')}
            </Button>
          </>
        }
      >
        <Field
          label={t('settings.servers.sounds.name')}
          name="sound_rename"
          value={renameValue}
          maxLength={32}
          hint={t('settings.servers.sounds.nameHint')}
          onChange={(event_) => setRenameValue(event_.target.value)}
        />
        {rename.isError ? <ErrorNotice className="mt-3" error={rename.error} /> : null}
      </Modal>

      <Modal
        open={removing !== null}
        title={t('settings.servers.sounds.deleteConfirmTitle')}
        onClose={() => setRemoving(null)}
        footer={
          <>
            <Button variant="ghost" onClick={() => setRemoving(null)}>
              {t('common.cancel')}
            </Button>
            <Button
              variant="ghost"
              className="border-danger/50 text-danger"
              disabled={remove.isPending}
              onClick={() => {
                if (removing !== null) {
                  remove.mutate(removing.id);
                }
              }}
            >
              {t('settings.servers.sounds.deleteConfirm')}
            </Button>
          </>
        }
      >
        <p className="text-sm text-fg-muted">
          {t('settings.servers.sounds.deleteConfirmBody', { name: removing?.name ?? '' })}
        </p>
      </Modal>
    </SettingsSection>
  );
}