import type { components } from '@pipu/api-client';
import { unwrap } from '@pipu/core';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { useNavigate } from '@tanstack/react-router';
import { useId, useState, type FormEvent } from 'react';
import { useTranslation } from 'react-i18next';

import { useSession, useUser } from '../../app/session';
import { GeniusPanel } from './GeniusPanel';
import { useErrorText, useFieldError } from '../../shared/lib/errors';
import { addIcon, chevronRightIcon, folderIcon, moreIcon, refreshIcon } from '../../shared/ui/icons';
import { Button, Dialog, EmptyState, Field, FormError, Icon, Menu, Segmented, type MenuItem } from '../../shared/ui/ui';
import s from '../page.module.css';
import l from './library.module.css';
import { ScanLine, StatusBadge } from './ScanStatus';

type Source = components['schemas']['Source'];
type TestResult = components['schemas']['SourceTestResult'];

const SCAN_POLL_MS = 2000;

export function SourcesPage() {
	const user = useUser();
  const { t } = useTranslation(['admin', 'common']);
  const session = useSession();
  const errorText = useErrorText();
  const [editing, setEditing] = useState<Source | 'new' | null>(null);

  const sources = useQuery({
    queryKey: ['sources'],
    queryFn: async () => unwrap(await session.client.GET('/api/v1/admin/sources')).items,
    // Пока идёт скан — опрашиваем прогресс.
    refetchInterval: (q) => (q.state.data?.some((x) => x.scan?.running) ? SCAN_POLL_MS : false),
  });

  return (
    <div className={s.page}>
      <div className={s.head}>
        <div>
          <h1>{t('sources.title')}</h1>
          <p className={s.subtitle}>{t('sources.subtitle')}</p>
        </div>
        <Button variant="primary" icon={addIcon} onClick={() => setEditing('new')}>
          {t('sources.add')}
        </Button>
      </div>
      <FormError>{sources.error ? errorText(sources.error) : null}</FormError>
      {user.role === 'admin' && <GeniusPanel />}
      {sources.isSuccess && sources.data.length === 0 && (
        <EmptyState icon={folderIcon} action={<Button variant="primary" onClick={() => setEditing('new')}>{t('sources.add')}</Button>}>
          {t('sources.empty')}
        </EmptyState>
      )}
      <div className={l.list}>
        {sources.data?.map((src) => (
          <SourceCard key={src.id} source={src} onEdit={() => setEditing(src)} />
        ))}
      </div>
      {editing && <SourceDialog source={editing === 'new' ? null : editing} onClose={() => setEditing(null)} />}
    </div>
  );
}

function location(src: Source): string {
  if (src.type === 'nfs') return `${src.nfs_server ?? ''}:${src.nfs_export ?? ''}`;
  return `LIBRARY_HOST/${src.local_path ?? ''}`;
}

function SourceCard({ source, onEdit }: { source: Source; onEdit: () => void }) {
  const { t } = useTranslation(['admin', 'common']);
  const session = useSession();
  const queryClient = useQueryClient();
  const navigate = useNavigate();
  const errorText = useErrorText();
  const [test, setTest] = useState<TestResult | null>(null);
  const [confirmDelete, setConfirmDelete] = useState(false);
  const id = source.id;
  const covers = useQuery({
    queryKey: ['source-cover-stats', id],
    queryFn: async () => unwrap(await session.client.GET('/api/v1/admin/sources/{id}/cover-stats', { params: { path: { id } } })),
    refetchInterval: 10000,
  });
  const refresh = () => queryClient.invalidateQueries({ queryKey: ['sources'] });

  const scan = useMutation({
    mutationFn: async (full: boolean) =>
      unwrap(await session.client.POST('/api/v1/admin/sources/{id}/scan', { params: { path: { id } }, body: { full } })),
    onSuccess: refresh,
  });
  const check = useMutation({
    mutationFn: async () =>
      unwrap(await session.client.POST('/api/v1/admin/sources/{id}/test', { params: { path: { id } } })),
    onSuccess: setTest,
  });
  const patch = useMutation({
    mutationFn: async (enabled: boolean) =>
      unwrap(await session.client.PATCH('/api/v1/admin/sources/{id}', { params: { path: { id } }, body: { enabled } })),
    onSuccess: refresh,
  });
  const remove = useMutation({
    mutationFn: async () =>
      unwrap(await session.client.DELETE('/api/v1/admin/sources/{id}', { params: { path: { id } } })),
    onSuccess: refresh,
  });
  const error = scan.error ?? check.error ?? patch.error ?? remove.error;
  const running = source.scan?.running ?? false;
  const disabled = source.status === 'disabled';

  const menu: MenuItem[] = [
    { label: t('sources.full_scan'), icon: refreshIcon, onSelect: () => scan.mutate(true) },
    { label: t('sources.edit'), onSelect: onEdit },
    disabled
      ? { label: t('sources.enable'), onSelect: () => patch.mutate(true) }
      : { label: t('sources.disable'), onSelect: () => patch.mutate(false) },
    { label: t('sources.delete'), danger: true, onSelect: () => setConfirmDelete(true) },
  ];

  return (
    <article className={l.card} aria-label={source.name}>
      <div className={l.cardHead}>
        <div className={l.cardTitle}>
          {source.name}
          <span className={l.typeBadge}>{t(`sources.type_${source.type}`)}</span>
          <StatusBadge status={source.status} />
          {source.accepts_uploads && <span className={l.typeBadge}>{t('write_template.badge')}</span>}
        </div>
        <span className={l.location}>{location(source)}</span>
        {!!source.excluded_dirs?.length && <span className={s.note}>{t('sources.excluded_count', { count: source.excluded_dirs.length })}</span>}
        {source.status === 'error' && source.status_message && (
          <span className={l.message}>{source.status_message}</span>
        )}
      </div>
      <div className={l.cardActions}>
        <Button
          variant="primary"
          busy={scan.isPending}
          disabled={running || source.status !== 'mounted'}
          onClick={() => scan.mutate(false)}
        >
          {t('sources.scan')}
        </Button>
        <Button busy={check.isPending} onClick={() => check.mutate()}>
          {t('sources.test')}
        </Button>
        <Button onClick={() => void navigate({ to: '/admin/sources/$id/patterns', params: { id } })}>
          {t('sources.patterns')}
        </Button>
        <Menu label={t('users.actions', { username: source.name })} trigger={<Icon src={moreIcon} />} items={menu} />
      </div>
      <div className={l.cardFoot}>
        <ScanLine scan={source.scan} lastScanAt={source.last_scan_at} />
        {covers.data && <span className={s.note} role="status">
          {t('sources.cover_files', { count: covers.data.files_with_cover, total: covers.data.files_total })}
          {covers.data.albums_pending > 0 && ` · ${t('sources.cover_pending', { count: covers.data.albums_pending })}`}
        </span>}
        <FormError>{covers.error ? errorText(covers.error) : null}</FormError>
        {test && (
          <span className={`${l.test} ${test.ok ? l.testOk : l.testFail}`} role="status">
            {test.ok ? t('sources.test_ok', { count: test.audio_files }) : t('sources.test_fail', { message: test.message })}
          </span>
        )}
        {test && test.write_ok !== null && test.write_ok !== undefined && (
          <span className={`${l.test} ${test.write_ok ? l.testOk : l.testFail}`} role="status">
            {test.write_ok ? t('write_template.write_ok') : t('write_template.write_fail', { message: test.write_message ?? '' })}
          </span>
        )}
        <FormError>{error ? errorText(error) : null}</FormError>
      </div>
      {confirmDelete && (
        <Dialog
          title={t('sources.delete')}
          onClose={() => setConfirmDelete(false)}
          footer={
            <>
              <Button variant="ghost" onClick={() => setConfirmDelete(false)}>
                {t('common:form.cancel')}
              </Button>
              <Button
                variant="danger"
                onClick={() => {
                  setConfirmDelete(false);
                  remove.mutate();
                }}
              >
                {t('users.confirm')}
              </Button>
            </>
          }
        >
          <p className={s.note}>{t('sources.delete_confirm', { name: source.name })}</p>
        </Dialog>
      )}
    </article>
  );
}

const INTERVALS = [0, 60, 360, 1440];

export function SourceDialog({ source, onClose }: { source: Source | null; onClose: () => void }) {
  const { t } = useTranslation(['admin', 'common']);
  const session = useSession();
  const queryClient = useQueryClient();
  const errorText = useErrorText();
  const fieldError = useFieldError();
  const [type, setType] = useState<'local' | 'nfs'>(source?.type ?? 'local');
  const [name, setName] = useState(source?.name ?? '');
  const [localPath, setLocalPath] = useState(source?.local_path ?? '');
  const [server, setServer] = useState(source?.nfs_server ?? '');
  const [exportPath, setExportPath] = useState(source?.nfs_export ?? '');
  const [options, setOptions] = useState(source?.nfs_options ?? 'nfsvers=4.1,soft,timeo=150,retrans=3');
  const [priority, setPriority] = useState<'tags_first' | 'path_first'>(source?.tag_priority ?? 'tags_first');
  const [interval, setIntervalMin] = useState(source?.scan_interval_minutes ?? 0);
  const [excludedDirs, setExcludedDirs] = useState((source?.excluded_dirs ?? []).join('\n'));
  const excludedDirsId = useId();

  const save = useMutation({
    mutationFn: async () => {
      const common = {
        name: name.trim(),
        tag_priority: priority,
        excluded_dirs: excludedDirs.split(/\r?\n/).map((dir) => dir.trim()).filter(Boolean),
        ...(type === 'local'
          ? { local_path: localPath }
          : { nfs_server: server.trim(), nfs_export: exportPath.trim(), nfs_options: options.trim() }),
      };
      if (source)
        return unwrap(
          await session.client.PATCH('/api/v1/admin/sources/{id}', {
            params: { path: { id: source.id } },
            body: { ...common, scan_interval_minutes: interval },
          }),
        );
      return unwrap(
        await session.client.POST('/api/v1/admin/sources', {
          body: { ...common, type, scan_interval_minutes: interval || null },
        }),
      );
    },
    onSuccess: async () => {
      await queryClient.invalidateQueries({ queryKey: ['sources'] });
      for (const key of ['library-status', 'library-errors', 'analysis-errors']) {
        void queryClient.invalidateQueries({ queryKey: [key] });
      }
      onClose();
    },
  });
  const err = save.error;
  const fields = ['name', 'local_path', 'nfs_server', 'nfs_export', 'nfs_options', 'excluded_dirs'];
  const general = err && !fields.some((f) => fieldError(err, f)) ? errorText(err) : null;

  const submit = (e: FormEvent) => {
    e.preventDefault();
    save.mutate();
  };

  return (
    <Dialog
      title={t(source ? 'sources.form_title_edit' : 'sources.form_title_new')}
      onClose={onClose}
      footer={
        <>
          <Button variant="ghost" onClick={onClose}>
            {t('common:form.cancel')}
          </Button>
          <Button type="submit" form="source-form" variant="primary" busy={save.isPending} disabled={!name.trim()}>
            {t('sources.save')}
          </Button>
        </>
      }
    >
      <form id="source-form" onSubmit={submit} noValidate className={s.sessions}>
        <Field label={t('sources.name')} value={name} onChange={setName} maxLength={100} error={fieldError(err, 'name')} />
        {!source && (
          <div className={l.field}>
            <span className={l.label}>{t('sources.type')}</span>
            <Segmented
              label={t('sources.type')}
              value={type}
              onChange={setType}
              options={[
                { value: 'local', label: t('sources.type_local') },
                { value: 'nfs', label: t('sources.type_nfs') },
              ]}
            />
          </div>
        )}
        {type === 'local' ? (
          <FolderPicker value={localPath} onChange={setLocalPath} error={fieldError(err, 'local_path')} />
        ) : (
          <>
            <Field
              label={t('sources.nfs_server')}
              value={server}
              onChange={setServer}
              hint={t('sources.nfs_server_hint')}
              error={fieldError(err, 'nfs_server')}
              mono
            />
            <Field
              label={t('sources.nfs_export')}
              value={exportPath}
              onChange={setExportPath}
              hint={t('sources.nfs_export_hint')}
              error={fieldError(err, 'nfs_export')}
              mono
            />
            <Field
              label={t('sources.nfs_options')}
              value={options}
              onChange={setOptions}
              hint={t('sources.nfs_options_hint')}
              error={fieldError(err, 'nfs_options')}
              mono
            />
          </>
        )}
        <div className={l.field}>
          <label htmlFor={excludedDirsId} className={l.label}>{t('sources.excluded_dirs')}</label>
          <textarea id={excludedDirsId} className={l.excludedDirs} rows={5}
            value={excludedDirs} onChange={(event) => setExcludedDirs(event.target.value)}
            disabled={source?.scan?.running ?? false}
            placeholder="Downloads_PumpEars"
            aria-invalid={!!fieldError(err, 'excluded_dirs')}
            aria-describedby={`${excludedDirsId}-hint`} />
          <span id={`${excludedDirsId}-hint`} className={s.note}>
            {fieldError(err, 'excluded_dirs') ?? t(source?.scan?.running ? 'sources.excluded_running' : 'sources.excluded_hint')}
          </span>
        </div>
        <div className={l.field}>
          <span className={l.label}>{t('sources.tag_priority')}</span>
          <Segmented
            label={t('sources.tag_priority')}
            value={priority}
            onChange={setPriority}
            options={[
              { value: 'tags_first', label: t('sources.tags_first') },
              { value: 'path_first', label: t('sources.path_first') },
            ]}
          />
        </div>
        <label className={l.field}>
          <span className={l.label}>{t('sources.interval')}</span>
          <select className={s.select} value={interval} onChange={(e) => setIntervalMin(Number(e.target.value))}>
            {[...new Set([...INTERVALS, interval])].map((m) => (
              <option key={m} value={m}>
                {m === 0 ? t('sources.interval_off') : t('sources.interval_hours', { count: Math.round(m / 60) })}
              </option>
            ))}
          </select>
        </label>
        <FormError>{general}</FormError>
      </form>
    </Dialog>
  );
}

/** Выбор подпапки LIBRARY_HOST: хлебные крошки и список вложенных папок. */
function FolderPicker({ value, onChange, error }: { value: string; onChange: (v: string) => void; error?: string }) {
  const { t } = useTranslation('admin');
  const session = useSession();
  const dirs = useQuery({
    queryKey: ['host-dirs', value],
    queryFn: async () =>
      unwrap(await session.client.GET('/api/v1/admin/library/host-dirs', { params: { query: { path: value } } })),
  });
  const parts = value ? value.split('/') : [];
  return (
    <div className={l.field}>
      <span className={l.label}>{t('sources.folder')}</span>
      <div className={l.picker}>
        <div className={l.crumbs}>
          <button type="button" className={l.dir} onClick={() => onChange('')}>
            LIBRARY_HOST
          </button>
          {parts.map((p, i) => (
            <span key={i} className={l.crumbs}>
              <Icon src={chevronRightIcon} size={14} />
              <button type="button" className={l.dir} onClick={() => onChange(parts.slice(0, i + 1).join('/'))}>
                {p}
              </button>
            </span>
          ))}
        </div>
        {dirs.data?.dirs.map((d) => (
          <button key={d} type="button" className={l.dir} onClick={() => onChange(value ? `${value}/${d}` : d)}>
            <Icon src={folderIcon} size={18} className={l.dirIcon} />
            {d}
          </button>
        ))}
      </div>
      <span className={s.note}>{error ?? (value ? value : t('sources.folder_root'))}</span>
    </div>
  );
}