import { useEffect, useMemo, useRef, useState, type ReactNode } from 'react';

import { ApiError } from '@/api';
import {
  useAccounts,
  useAnalyzeImport,
  useArtists,
  useCreateAccount,
  useCreateVolunteer,
  useDeleteAccount,
  useDeleteVolunteer,
  useEdition,
  useExecuteImport,
  usePositions,
  useReplaceAvailability,
  useUpdateVolunteer,
  useVolunteerAvailability,
  useVolunteers,
} from '@/api/hooks';
import type {
  ArtistRead,
  ImportAnalyzeResponse,
  ImportFieldKey,
  ImportIssue,
  ImportMapping,
  ImportReport,
  PositionRead,
  VolunteerCreate,
  VolunteerRead,
} from '@/api/schema';
import { FieldLabel, HelpTip, TextInput } from '@/components/ui';
import { ErrorNote, Loading } from '@/components/state';
import { t } from '@/i18n';
import { shortDayLabel } from '@/lib/time';
import { cx } from '@/lib/cx';

const MAP_FIELDS: Array<{ key: ImportFieldKey; required: boolean }> = [
  { key: 'first_name', required: true },
  { key: 'last_name', required: true },
  { key: 'email', required: false },
  { key: 'phone', required: false },
  { key: 'comment', required: false },
];

const FIELD_LABEL: Record<ImportFieldKey, string> = {
  first_name: 'config.vol.field.firstName',
  last_name: 'config.vol.field.lastName',
  email: 'config.vol.field.email',
  phone: 'config.vol.field.phone',
  comment: 'config.vol.field.comment',
};

type WishOption = { id: string; label: string; hint?: string };

function artistOptions(artists: ArtistRead[] | undefined): WishOption[] {
  return [...(artists ?? [])]
    .sort(
      (a, b) =>
        a.performance_date.localeCompare(b.performance_date) ||
        a.name.localeCompare(b.name, 'fr'),
    )
    .map((a) => ({
      id: a.id,
      label: a.name,
      hint: shortDayLabel(`${a.performance_date}T12:00`),
    }));
}

function positionOptions(positions: PositionRead[] | undefined): WishOption[] {
  return [...(positions ?? [])]
    .sort((a, b) => a.name.localeCompare(b.name, 'fr'))
    .map((p) => ({ id: p.id, label: p.name, hint: p.location ?? undefined }));
}

/** Les autres bénévoles, pour le vœu de compagnon (jamais soi-même). */
function volunteerOptions(
  volunteers: VolunteerRead[] | undefined,
  excludeId?: string,
): WishOption[] {
  return [...(volunteers ?? [])]
    .filter((v) => v.id !== excludeId)
    .sort(
      (a, b) =>
        a.last_name.localeCompare(b.last_name, 'fr') ||
        a.first_name.localeCompare(b.first_name, 'fr'),
    )
    .map((v) => ({ id: v.id, label: `${v.first_name} ${v.last_name}` }));
}

/**
 * Accès de connexion (lien magique) du bénévole. Ajouter un email sur sa
 * fiche ne crée aucun compte : sans ce geste explicite, `auth/magic-link` ne
 * trouve personne à qui écrire et ne fait rien (par conception, pour ne
 * jamais révéler si un email existe).
 */
function VolunteerAccessSection({
  volunteerId,
  email,
}: {
  volunteerId: string;
  email: string | null;
}) {
  const accounts = useAccounts();
  const createAccount = useCreateAccount();
  const deleteAccount = useDeleteAccount();
  const account = accounts.data?.find((a) => a.volunteer_id === volunteerId);

  return (
    <div>
      <FieldLabel>
        {t('config.vol.access.title')} <HelpTip text={t('config.vol.access.hint')} />
      </FieldLabel>
      {account ? (
        <div className="flex items-center justify-between gap-2 border-2 border-ink bg-cream p-[9px]">
          <span className="min-w-0 truncate font-mono text-[10px]">
            {t('config.vol.access.active', { email: account.email })}
          </span>
          <button
            type="button"
            disabled={deleteAccount.isPending}
            onClick={() => {
              if (window.confirm(t('config.vol.access.revokeConfirm'))) {
                deleteAccount.mutate(account.id);
              }
            }}
            className="flex-none cursor-pointer border-2 border-ink bg-paper px-[8px] py-[5px] font-display text-[9.5px] font-extrabold uppercase tracking-wide hover:bg-orange disabled:opacity-50"
          >
            {t('config.vol.access.revoke')}
          </button>
        </div>
      ) : (
        <button
          type="button"
          disabled={!email || createAccount.isPending}
          onClick={() =>
            email && createAccount.mutate({ email, role: 'VOLUNTEER', volunteer_id: volunteerId })
          }
          className="cursor-pointer border-2 border-ink bg-cream px-[10px] py-[7px] font-display text-[10.5px] font-extrabold uppercase tracking-wide hover:bg-yellow disabled:cursor-not-allowed disabled:opacity-50"
        >
          {createAccount.isPending ? t('app.loading') : t('config.vol.access.grant')}
        </button>
      )}
      {!account && !email ? (
        <div className="mt-1 font-mono text-[9.5px] opacity-60">
          {t('config.vol.access.needEmail')}
        </div>
      ) : null}
      {createAccount.isError ? <ErrorNote error={createAccount.error} /> : null}
      {deleteAccount.isError ? <ErrorNote error={deleteAccount.error} /> : null}
    </div>
  );
}

function WishPicker({
  label,
  options,
  selected,
  onChange,
  emptyLabel,
  addLabel,
}: {
  label: ReactNode;
  options: WishOption[];
  selected: string[];
  onChange: (ids: string[]) => void;
  emptyLabel: string;
  addLabel: string;
}) {
  const byId = new Map(options.map((o) => [o.id, o]));
  const available = options.filter((o) => !selected.includes(o.id));
  return (
    <div>
      <FieldLabel>{label}</FieldLabel>
      <div className="mb-2 flex flex-wrap gap-[6px]">
        {selected.map((id) => (
          <button
            key={id}
            type="button"
            onClick={() => onChange(selected.filter((x) => x !== id))}
            className="cursor-pointer border-2 border-ink bg-blue px-2 py-[5px] font-mono text-[10px] font-semibold hover:bg-orange"
          >
            {byId.get(id)?.label ?? id} ✕
          </button>
        ))}
        {selected.length === 0 ? (
          <span className="font-mono text-[10px] opacity-55">{emptyLabel}</span>
        ) : null}
      </div>
      <select
        value=""
        onChange={(e) => {
          if (e.target.value) onChange([...selected, e.target.value]);
        }}
        disabled={available.length === 0}
        className="w-full border-2 border-ink bg-cream p-[7px] font-mono text-[11px] disabled:opacity-50"
      >
        <option value="">{addLabel}</option>
        {available.map((o) => (
          <option key={o.id} value={o.id}>
            {o.hint ? `${o.hint} · ${o.label}` : o.label}
          </option>
        ))}
      </select>
    </div>
  );
}

type Mode = 'list' | 'add' | 'import';

/** Retire les paramètres nuls avant traduction (`t` n'accepte pas `null`). */
function issueParams(issue: ImportIssue): Record<string, string | number> {
  const out: Record<string, string | number> = {};
  for (const [k, v] of Object.entries(issue.params)) {
    if (v != null) out[k] = v;
  }
  return out;
}

export function ConfigVolunteers() {
  const volunteers = useVolunteers();
  const artists = useArtists();
  const positions = usePositions();
  const updateVolunteer = useUpdateVolunteer();
  const deleteVolunteer = useDeleteVolunteer();

  const [mode, setMode] = useState<Mode>('list');
  const [selectedId, setSelectedId] = useState<string | null>(null);
  const [search, setSearch] = useState('');

  const artistOpts = useMemo(() => artistOptions(artists.data), [artists.data]);
  const positionOpts = useMemo(() => positionOptions(positions.data), [positions.data]);
  const companionOpts = useMemo(
    () => volunteerOptions(volunteers.data, selectedId ?? undefined),
    [volunteers.data, selectedId],
  );

  const filtered = useMemo(() => {
    const needle = search.trim().toLowerCase();
    const list = [...(volunteers.data ?? [])];
    if (!needle) return list;
    return list.filter((v) =>
      `${v.first_name} ${v.last_name} ${v.email ?? ''}`.toLowerCase().includes(needle),
    );
  }, [volunteers.data, search]);

  const selected = useMemo(() => {
    const list = volunteers.data ?? [];
    return list.find((v) => v.id === selectedId) ?? null;
  }, [volunteers.data, selectedId]);

  if (volunteers.isLoading) return <Loading />;
  if (volunteers.error) return <ErrorNote error={volunteers.error} />;

  const total = volunteers.data?.length ?? 0;
  const rows = filtered.slice(0, 60);
  const patch = (body: Parameters<typeof updateVolunteer.mutate>[0]['body']) =>
    selected && updateVolunteer.mutate({ id: selected.id, body });

  if (mode === 'add') {
    return <AddVolunteerForm onClose={() => setMode('list')} />;
  }
  if (mode === 'import') {
    return <ImportWizard onClose={() => setMode('list')} />;
  }

  return (
    <div className="flex min-h-0 flex-1 items-stretch">
      <div className="max-h-[calc(100vh-118px)] min-w-0 flex-1 overflow-auto p-4">
        <div className="mb-[14px] flex flex-wrap items-stretch gap-3">
          <div className="flex flex-1 flex-col justify-center gap-[10px] border-[3px] border-ink bg-paper p-[14px] shadow-brutal-lg">
            <div>
              <span className="flex items-center gap-[7px] font-display text-[15px] font-black">
                {t('config.vol.importTitle')}
                <HelpTip text={t('config.vol.importHint')} side="bottom" />
              </span>
            </div>
            <div className="flex flex-wrap gap-[10px]">
              <button
                type="button"
                onClick={() => setMode('add')}
                className="cursor-pointer border-[3px] border-ink bg-yellow px-[14px] py-3 font-display text-[12px] font-black uppercase tracking-wide shadow-brutal hover:bg-green hover:text-white"
              >
                + {t('config.vol.addButton')}
              </button>
              <button
                type="button"
                onClick={() => setMode('import')}
                className="cursor-pointer border-[3px] border-ink bg-cream px-[14px] py-3 font-display text-[12px] font-black uppercase tracking-wide shadow-brutal hover:bg-yellow"
              >
                ↓ {t('config.vol.importButton2')}
              </button>
            </div>
          </div>
          <div className="flex-none border-[3px] border-ink bg-paper px-[14px] py-3 shadow-brutal-lg">
            <div className="font-mono text-[24px] font-bold">{total}</div>
            <div className="mt-1 font-display text-[9px] font-extrabold uppercase tracking-wide">
              {t('config.vol.profiles')}
            </div>
          </div>
        </div>

        <div className="mb-[10px]">
          <input
            value={search}
            onChange={(e) => setSearch(e.target.value)}
            placeholder={t('config.vol.search')}
            className="w-full border-2 border-ink bg-cream p-[9px] font-mono text-[12px]"
          />
        </div>

        {total === 0 ? (
          <div className="border-[3px] border-dashed border-ink bg-paper p-[22px] font-display text-[13px] font-extrabold">
            {t('config.vol.emptyList')}
          </div>
        ) : rows.length === 0 ? (
          <div className="border-[3px] border-dashed border-ink bg-paper p-[22px] font-display text-[13px] font-extrabold">
            {t('config.vol.noMatch')}
          </div>
        ) : (
          <div className="border-[3px] border-ink bg-paper shadow-brutal-lg">
            <div
              className="grid gap-[10px] bg-ink px-[10px] py-[7px] font-display text-[9.5px] font-extrabold uppercase tracking-wide text-cream"
              style={{ gridTemplateColumns: 'minmax(0,2fr) minmax(0,1.4fr) minmax(0,2fr) minmax(0,1.4fr)' }}
            >
              <span>{t('config.vol.colName')}</span>
              <span>{t('config.vol.colPhone')}</span>
              <span>{t('config.vol.colEmail')}</span>
              <span>{t('config.vol.colWishes')}</span>
            </div>
            {rows.map((volunteer) => {
              const active = volunteer.id === selected?.id;
              return (
                <button
                  key={volunteer.id}
                  type="button"
                  onClick={() => setSelectedId(volunteer.id)}
                  className={cx(
                    'grid w-full items-center gap-[10px] border-b border-sand-line px-[10px] py-[7px] text-left',
                    active ? 'bg-yellow' : 'hover:bg-cream',
                  )}
                  style={{ gridTemplateColumns: 'minmax(0,2fr) minmax(0,1.4fr) minmax(0,2fr) minmax(0,1.4fr)' }}
                >
                  <span className="flex min-w-0 items-center gap-[7px]">
                    <span className="flex h-6 w-6 flex-none items-center justify-center border-2 border-ink bg-paper font-display text-[9.5px] font-extrabold">
                      {volunteer.first_name[0]}
                      {volunteer.last_name[0]}
                    </span>
                    <span className="truncate font-display text-[12.5px] font-bold">
                      {volunteer.first_name} {volunteer.last_name}
                    </span>
                  </span>
                  <span className="truncate font-mono text-[11px] opacity-80">
                    {volunteer.phone ?? '—'}
                  </span>
                  <span className="truncate font-mono text-[10.5px] opacity-70">
                    {volunteer.email ?? '—'}
                  </span>
                  <span className="truncate font-mono text-[10px] opacity-70">
                    {t('config.vol.wishesCount', {
                      count:
                        volunteer.artist_ids.length +
                        volunteer.wished_position_ids.length +
                        volunteer.wished_companion_ids.length,
                    })}
                  </span>
                </button>
              );
            })}
            {filtered.length > rows.length ? (
              <div className="px-[10px] py-[7px] font-mono text-[10px] opacity-60">
                {t('config.vol.count', { count: filtered.length })}
              </div>
            ) : null}
          </div>
        )}
      </div>

      {selected ? (
        <aside className="max-h-[calc(100vh-118px)] w-[360px] flex-none overflow-auto border-l-[3px] border-ink bg-paper">
          <div className="bg-ink px-[13px] py-[11px] text-cream">
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-[6px] font-mono text-[10px] text-yellow">
                {t('config.vol.ficheKicker')}
                <HelpTip text={t('config.vol.note')} side="bottom" />
              </div>
              <button
                type="button"
                onClick={() => setSelectedId(null)}
                className="cursor-pointer font-mono text-[11px] text-cream/70 hover:text-cream"
              >
                ✕
              </button>
            </div>
            <div className="mt-[7px] flex items-center gap-[9px]">
              <span className="flex h-[34px] w-[34px] flex-none items-center justify-center border-2 border-cream bg-yellow font-display text-[13px] font-extrabold text-ink">
                {selected.first_name[0]}
                {selected.last_name[0]}
              </span>
              <span className="font-display text-[18px] font-black tracking-tight">
                {selected.first_name} {selected.last_name}
              </span>
            </div>
          </div>

          <div className="flex flex-col gap-3 p-[13px]">
            <div className="grid grid-cols-2 gap-2">
              <label className="block">
                <FieldLabel>{t('config.vol.field.firstName')}</FieldLabel>
                <TextInput value={selected.first_name} onChange={(v) => patch({ first_name: v })} />
              </label>
              <label className="block">
                <FieldLabel>{t('config.vol.field.lastName')}</FieldLabel>
                <TextInput value={selected.last_name} onChange={(v) => patch({ last_name: v })} />
              </label>
            </div>
            <label className="block">
              <FieldLabel>{t('config.vol.field.phone')}</FieldLabel>
              <TextInput mono value={selected.phone ?? ''} onChange={(v) => patch({ phone: v || null })} />
            </label>
            <label className="block">
              <FieldLabel>{t('config.vol.field.email')}</FieldLabel>
              <TextInput mono value={selected.email ?? ''} onChange={(v) => patch({ email: v || null })} />
            </label>
            <label className="block">
              <FieldLabel>{t('config.vol.field.comment')}</FieldLabel>
              <textarea
                value={selected.comment ?? ''}
                onChange={(e) => patch({ comment: e.target.value || null })}
                rows={2}
                className="w-full border-2 border-ink bg-cream p-[9px] font-display text-[13px] font-bold"
              />
            </label>

            <VolunteerAccessSection volunteerId={selected.id} email={selected.email} />

            <WishPicker
              label={t('config.vol.field.artists')}
              options={artistOpts}
              selected={selected.artist_ids}
              onChange={(ids) => patch({ artist_ids: ids })}
              emptyLabel={t('config.vol.noArtists')}
              addLabel={t('config.vol.pickArtist')}
            />
            <WishPicker
              label={t('config.vol.field.positions')}
              options={positionOpts}
              selected={selected.wished_position_ids}
              onChange={(ids) => patch({ wished_position_ids: ids })}
              emptyLabel={t('config.vol.noPositions')}
              addLabel={t('config.vol.pickPosition')}
            />
            <WishPicker
              label={
                <>
                  {t('config.vol.field.companions')}{' '}
                  <HelpTip text={t('config.vol.companionsHint')} />
                </>
              }
              options={companionOpts}
              selected={selected.wished_companion_ids}
              onChange={(ids) => patch({ wished_companion_ids: ids })}
              emptyLabel={t('config.vol.noCompanions')}
              addLabel={t('config.vol.pickCompanion')}
            />

            <AvailabilityEditor volunteerId={selected.id} />

            <button
              type="button"
              onClick={() => {
                if (window.confirm(t('config.vol.deleteConfirm'))) {
                  deleteVolunteer.mutate(selected.id);
                  setSelectedId(null);
                }
              }}
              className="mt-2 cursor-pointer border-[3px] border-ink bg-cream p-[10px] font-display text-[11px] font-extrabold uppercase tracking-wide shadow-brutal hover:bg-orange"
            >
              {t('config.vol.delete')}
            </button>
          </div>
        </aside>
      ) : null}
    </div>
  );
}

// --------------------------------------------------------------------------- //
// Ajout manuel                                                                 //
// --------------------------------------------------------------------------- //
function AddVolunteerForm({ onClose }: { onClose: () => void }) {
  const createVolunteer = useCreateVolunteer();
  const artists = useArtists();
  const positions = usePositions();
  const volunteers = useVolunteers();
  const [form, setForm] = useState<VolunteerCreate>({ first_name: '', last_name: '' });
  const [artistIds, setArtistIds] = useState<string[]>([]);
  const [wishedPositionIds, setWishedPositionIds] = useState<string[]>([]);
  const [wishedCompanionIds, setWishedCompanionIds] = useState<string[]>([]);
  const [localError, setLocalError] = useState<string | null>(null);

  const artistOpts = useMemo(() => artistOptions(artists.data), [artists.data]);
  const positionOpts = useMemo(() => positionOptions(positions.data), [positions.data]);
  const companionOpts = useMemo(() => volunteerOptions(volunteers.data), [volunteers.data]);

  const set = <K extends keyof VolunteerCreate>(key: K, value: VolunteerCreate[K]) =>
    setForm((f) => ({ ...f, [key]: value }));

  const submit = async () => {
    setLocalError(null);
    if (!form.first_name.trim() || !form.last_name.trim()) {
      setLocalError(t('config.vol.requiredNames'));
      return;
    }
    try {
      await createVolunteer.mutateAsync({
        first_name: form.first_name.trim(),
        last_name: form.last_name.trim(),
        email: form.email?.trim() || null,
        phone: form.phone?.trim() || null,
        comment: form.comment?.trim() || null,
        artist_ids: artistIds,
        wished_position_ids: wishedPositionIds,
        wished_companion_ids: wishedCompanionIds,
      });
      onClose();
    } catch (err) {
      setLocalError(err instanceof ApiError ? t(err.code) : t('error.generic'));
    }
  };

  return (
    <div className="max-h-[calc(100vh-118px)] min-h-0 flex-1 overflow-auto p-4">
      <div className="mx-auto max-w-[560px] border-[3px] border-ink bg-paper shadow-brutal-lg">
        <div className="flex items-center justify-between bg-ink px-[14px] py-[11px] text-cream">
          <span className="flex items-center gap-[7px] font-display text-[14px] font-black">
            {t('config.vol.addTitle')}
            <HelpTip text={t('config.vol.addAvailabilityHint')} side="bottom" />
          </span>
          <button
            type="button"
            onClick={onClose}
            className="cursor-pointer font-mono text-[12px] text-cream/70 hover:text-cream"
          >
            ✕
          </button>
        </div>
        <form
          onSubmit={(e) => {
            e.preventDefault();
            void submit();
          }}
          className="flex flex-col gap-3 p-[14px]"
        >
          <div className="grid grid-cols-2 gap-2">
            <label className="block">
              <FieldLabel>{t('config.vol.field.firstName')} *</FieldLabel>
              <TextInput value={form.first_name} onChange={(v) => set('first_name', v)} />
            </label>
            <label className="block">
              <FieldLabel>{t('config.vol.field.lastName')} *</FieldLabel>
              <TextInput value={form.last_name} onChange={(v) => set('last_name', v)} />
            </label>
          </div>
          <label className="block">
            <FieldLabel>
              {t('config.vol.field.email')} <HelpTip text={t('config.vol.addHint')} />
            </FieldLabel>
            <TextInput mono value={form.email ?? ''} onChange={(v) => set('email', v)} />
          </label>
          <label className="block">
            <FieldLabel>{t('config.vol.field.phone')}</FieldLabel>
            <TextInput mono value={form.phone ?? ''} onChange={(v) => set('phone', v)} />
          </label>
          <label className="block">
            <FieldLabel>{t('config.vol.field.comment')}</FieldLabel>
            <textarea
              value={form.comment ?? ''}
              onChange={(e) => set('comment', e.target.value)}
              rows={2}
              className="w-full border-2 border-ink bg-cream p-[9px] font-display text-[13px] font-bold"
            />
          </label>

          <WishPicker
            label={t('config.vol.field.artists')}
            options={artistOpts}
            selected={artistIds}
            onChange={setArtistIds}
            emptyLabel={t('config.vol.noArtists')}
            addLabel={t('config.vol.pickArtist')}
          />
          <WishPicker
            label={t('config.vol.field.positions')}
            options={positionOpts}
            selected={wishedPositionIds}
            onChange={setWishedPositionIds}
            emptyLabel={t('config.vol.noPositions')}
            addLabel={t('config.vol.pickPosition')}
          />
          <WishPicker
            label={
              <>
                {t('config.vol.field.companions')}{' '}
                <HelpTip text={t('config.vol.companionsHint')} />
              </>
            }
            options={companionOpts}
            selected={wishedCompanionIds}
            onChange={setWishedCompanionIds}
            emptyLabel={t('config.vol.noCompanions')}
            addLabel={t('config.vol.pickCompanion')}
          />

          {localError ? (
            <div className="border-2 border-ink bg-orange p-[9px] font-display text-[11px] font-bold">
              {localError}
            </div>
          ) : null}

          <div className="flex gap-2">
            <button
              type="submit"
              disabled={createVolunteer.isPending}
              className="flex-1 cursor-pointer border-[3px] border-ink bg-yellow p-[11px] font-display text-[12px] font-black uppercase tracking-wide shadow-brutal hover:bg-green hover:text-white disabled:opacity-60"
            >
              {t('config.vol.create')}
            </button>
            <button
              type="button"
              onClick={onClose}
              className="cursor-pointer border-[3px] border-ink bg-cream px-[14px] font-display text-[11px] font-extrabold uppercase tracking-wide hover:bg-orange"
            >
              {t('config.vol.cancel')}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}

// --------------------------------------------------------------------------- //
// Import de fichier (assistant en 3 étapes)                                    //
// --------------------------------------------------------------------------- //
function ImportWizard({ onClose }: { onClose: () => void }) {
  const analyze = useAnalyzeImport();
  const execute = useExecuteImport();

  const [file, setFile] = useState<File | null>(null);
  const [analysis, setAnalysis] = useState<ImportAnalyzeResponse | null>(null);
  const [colMap, setColMap] = useState<Partial<Record<ImportFieldKey, string>>>({});
  const [report, setReport] = useState<ImportReport | null>(null);
  const [mapError, setMapError] = useState<string | null>(null);
  const fileInput = useRef<HTMLInputElement>(null);

  const step: 1 | 2 | 3 = report ? 3 : analysis ? 2 : 1;

  const pickFile = async (f: File) => {
    setFile(f);
    setAnalysis(null);
    setReport(null);
    setMapError(null);
    try {
      const res = await analyze.mutateAsync(f);
      setAnalysis(res);
      setColMap({ ...res.suggested_mapping });
    } catch {
      /* l'erreur est portée par analyze.error */
    }
  };

  const buildMapping = (dryRun: boolean): ImportMapping => ({
    dry_run: dryRun,
    columns: {
      first_name: colMap.first_name ?? '',
      last_name: colMap.last_name ?? '',
      email: colMap.email || null,
      phone: colMap.phone || null,
      comment: colMap.comment || null,
    },
  });

  const run = async (dryRun: boolean) => {
    if (!file) return;
    setMapError(null);
    if (!colMap.first_name || !colMap.last_name) {
      setMapError(t('config.vol.wiz.mapMissing'));
      return;
    }
    try {
      const res = await execute.mutateAsync({ file, mapping: buildMapping(dryRun) });
      setReport(res);
    } catch {
      /* l'erreur est portée par execute.error */
    }
  };

  const restart = () => {
    setReport(null);
  };

  return (
    <div className="max-h-[calc(100vh-118px)] min-h-0 flex-1 overflow-auto p-4">
      <div className="mx-auto max-w-[820px] border-[3px] border-ink bg-paper shadow-brutal-lg">
        <div className="flex items-center justify-between bg-ink px-[14px] py-[11px] text-cream">
          <span className="flex items-center gap-[7px] font-display text-[14px] font-black">
            {t('config.vol.wiz.title')}
            {step === 1 ? <HelpTip text={t('config.vol.wiz.fileHint')} side="bottom" /> : null}
          </span>
          <button
            type="button"
            onClick={onClose}
            className="cursor-pointer font-mono text-[12px] text-cream/70 hover:text-cream"
          >
            ✕
          </button>
        </div>

        <div className="flex gap-[6px] border-b-[3px] border-ink bg-sand px-[14px] py-[8px] font-display text-[9.5px] font-extrabold uppercase tracking-wide">
          {[
            ['config.vol.wiz.step1', 1],
            ['config.vol.wiz.step2', 2],
            ['config.vol.wiz.step3', 3],
          ].map(([key, n]) => (
            <span
              key={n as number}
              className={cx(
                'border-2 border-ink px-[8px] py-[4px]',
                step === n ? 'bg-ink text-cream' : 'bg-cream text-ink opacity-70',
              )}
            >
              {t(key as string)}
            </span>
          ))}
        </div>

        <div className="flex flex-col gap-[14px] p-[14px]">
          {/* Étape 1 : fichier */}
          {step === 1 ? (
            <>
              <input
                ref={fileInput}
                type="file"
                accept=".csv,text/csv,.xlsx,.xls,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
                className="hidden"
                onChange={(e) => {
                  const f = e.target.files?.[0];
                  if (f) void pickFile(f);
                }}
              />
              <button
                type="button"
                onClick={() => fileInput.current?.click()}
                className="cursor-pointer border-[3px] border-dashed border-ink bg-cream p-[22px] font-display text-[13px] font-black uppercase tracking-wide hover:bg-yellow"
              >
                {analyze.isPending ? t('config.vol.wiz.analyzing') : t('config.vol.wiz.pickFile')}
              </button>
              {file ? (
                <div className="font-mono text-[11px] opacity-70">{file.name}</div>
              ) : null}
              {analyze.error ? <ErrorNote error={analyze.error} /> : null}
            </>
          ) : null}

          {/* Étape 2 : colonnes */}
          {step === 2 && analysis ? (
            <>
              <div className="font-mono text-[11px] font-bold">
                {t('config.vol.wiz.detected', {
                  rows: analysis.row_count,
                  cols: analysis.headers.length,
                })}
              </div>

              <div>
                <FieldLabel>
                  {t('config.vol.wiz.mapTitle')} <HelpTip text={t('config.vol.wiz.mapHint')} />
                </FieldLabel>
                <div className="grid gap-2 sm:grid-cols-2">
                  {MAP_FIELDS.map(({ key, required }) => (
                    <label key={key} className="block">
                      <span className="mb-[4px] block font-display text-[10px] font-bold">
                        {t(FIELD_LABEL[key])}
                        {required ? ' *' : ''}
                      </span>
                      <select
                        value={colMap[key] ?? ''}
                        onChange={(e) =>
                          setColMap((m) => ({ ...m, [key]: e.target.value || undefined }))
                        }
                        className="w-full border-2 border-ink bg-cream p-[7px] font-mono text-[11px]"
                      >
                        <option value="">{t('config.vol.wiz.ignore')}</option>
                        {analysis.headers.map((h) => (
                          <option key={h} value={h}>
                            {h}
                          </option>
                        ))}
                      </select>
                    </label>
                  ))}
                </div>
              </div>

              <div className="overflow-x-auto border-2 border-ink">
                <table className="w-full border-collapse font-mono text-[10px]">
                  <thead>
                    <tr className="bg-ink text-cream">
                      {analysis.headers.map((h) => (
                        <th key={h} className="border border-cream/30 px-[6px] py-[4px] text-left">
                          {h}
                        </th>
                      ))}
                    </tr>
                  </thead>
                  <tbody>
                    {analysis.preview.map((r) => (
                      <tr key={r.line}>
                        {analysis.headers.map((h) => (
                          <td key={h} className="border border-sand-line px-[6px] py-[3px]">
                            {r.values[h] ?? ''}
                          </td>
                        ))}
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>

              {mapError ? (
                <div className="border-2 border-ink bg-orange p-[9px] font-display text-[11px] font-bold">
                  {mapError}
                </div>
              ) : null}
              {execute.error ? <ErrorNote error={execute.error} /> : null}

              <div className="flex flex-wrap gap-2">
                <button
                  type="button"
                  onClick={() => void run(true)}
                  disabled={execute.isPending}
                  className="cursor-pointer border-[3px] border-ink bg-yellow px-[14px] py-[10px] font-display text-[12px] font-black uppercase tracking-wide shadow-brutal hover:bg-green hover:text-white disabled:opacity-60"
                >
                  {t('config.vol.wiz.simulate')}
                </button>
                <button
                  type="button"
                  onClick={() => {
                    setAnalysis(null);
                    setFile(null);
                  }}
                  className="cursor-pointer border-[3px] border-ink bg-cream px-[14px] font-display text-[11px] font-extrabold uppercase tracking-wide hover:bg-orange"
                >
                  {t('config.vol.wiz.back')}
                </button>
              </div>
            </>
          ) : null}

          {/* Étape 3 : rapport */}
          {step === 3 && report ? (
            <>
              <div
                className={cx(
                  'border-2 border-ink p-[10px] font-display text-[12px] font-black uppercase tracking-wide',
                  report.dry_run ? 'bg-yellow-soft' : 'bg-green text-white',
                )}
              >
                {report.dry_run ? t('config.vol.wiz.dryRunTitle') : t('config.vol.wiz.doneTitle')}
              </div>

              <div className="flex flex-wrap gap-2 font-mono text-[11px]">
                <span className="border-2 border-ink bg-paper px-[8px] py-[4px]">
                  {t('config.vol.wiz.created', { count: report.created })}
                </span>
                <span className="border-2 border-ink bg-paper px-[8px] py-[4px]">
                  {t('config.vol.wiz.updated', { count: report.updated })}
                </span>
                <span className="border-2 border-ink bg-paper px-[8px] py-[4px]">
                  {t('config.vol.wiz.skipped', { count: report.skipped })}
                </span>
              </div>

              {(() => {
                const flagged = report.rows.filter((r) => r.issues.length > 0);
                if (flagged.length === 0) {
                  return (
                    <div className="font-mono text-[11px] opacity-70">
                      {t('config.vol.wiz.noIssues')}
                    </div>
                  );
                }
                return (
                  <div>
                    <FieldLabel>{t('config.vol.wiz.rowsWithIssues')}</FieldLabel>
                    <div className="flex max-h-[280px] flex-col gap-[6px] overflow-auto border-2 border-ink p-[8px]">
                      {flagged.map((r) => (
                        <div key={r.line} className="font-mono text-[10.5px]">
                          <span className="font-bold">{t('config.vol.wiz.line', { line: r.line })}</span>{' '}
                          <span className="opacity-60">· {r.action}</span>
                          <ul className="ml-3 list-disc">
                            {r.issues.map((issue, k) => (
                              <li
                                key={k}
                                className={cx(
                                  issue.severity === 'ERROR' && 'font-bold text-orange-dark',
                                )}
                              >
                                {t(issue.code, issueParams(issue))}
                              </li>
                            ))}
                          </ul>
                        </div>
                      ))}
                    </div>
                  </div>
                );
              })()}

              {execute.error ? <ErrorNote error={execute.error} /> : null}

              <div className="flex flex-wrap gap-2">
                {report.dry_run ? (
                  <>
                    <button
                      type="button"
                      onClick={() => void run(false)}
                      disabled={execute.isPending}
                      className="cursor-pointer border-[3px] border-ink bg-green px-[14px] py-[10px] font-display text-[12px] font-black uppercase tracking-wide text-white shadow-brutal hover:bg-ink disabled:opacity-60"
                    >
                      {t('config.vol.wiz.runImport')}
                    </button>
                    <button
                      type="button"
                      onClick={restart}
                      className="cursor-pointer border-[3px] border-ink bg-cream px-[14px] font-display text-[11px] font-extrabold uppercase tracking-wide hover:bg-orange"
                    >
                      {t('config.vol.wiz.back')}
                    </button>
                  </>
                ) : (
                  <button
                    type="button"
                    onClick={onClose}
                    className="cursor-pointer border-[3px] border-ink bg-yellow px-[14px] py-[10px] font-display text-[12px] font-black uppercase tracking-wide shadow-brutal hover:bg-green hover:text-white"
                  >
                    {t('config.vol.wiz.close')}
                  </button>
                )}
              </div>
            </>
          ) : null}
        </div>
      </div>
    </div>
  );
}

// --------------------------------------------------------------------------- //
// Éditeur de disponibilités (fiche bénévole)                                   //
// --------------------------------------------------------------------------- //
type WindowRow = { date: string; start: string; end: string };

function editionDays(start: string, end: string): string[] {
  const out: string[] = [];
  for (
    let d = Date.parse(`${start}T00:00:00Z`);
    d <= Date.parse(`${end}T00:00:00Z`);
    d += 86_400_000
  ) {
    out.push(new Date(d).toISOString().slice(0, 10));
  }
  return out;
}

function AvailabilityEditor({ volunteerId }: { volunteerId: string }) {
  const edition = useEdition();
  const windows = useVolunteerAvailability(volunteerId);
  const replace = useReplaceAvailability();

  const [rows, setRows] = useState<WindowRow[]>([]);
  const [dirty, setDirty] = useState(false);

  const serverRows = useMemo<WindowRow[]>(
    () =>
      (windows.data ?? []).map((w) => ({
        date: w.date,
        start: w.start_time.slice(0, 5),
        end: w.end_time.slice(0, 5),
      })),
    [windows.data],
  );

  // Recharge depuis le serveur tant que l'utilisateur n'a rien modifié.
  useEffect(() => {
    if (!dirty) setRows(serverRows);
  }, [serverRows, dirty]);

  // Repart de zéro quand on change de bénévole.
  useEffect(() => {
    setDirty(false);
  }, [volunteerId]);

  const days = edition.data
    ? editionDays(edition.data.start_date, edition.data.end_date)
    : [];

  const patch = (i: number, next: Partial<WindowRow>) => {
    setDirty(true);
    setRows((rs) => rs.map((r, j) => (j === i ? { ...r, ...next } : r)));
  };

  const save = () => {
    replace.mutate(
      {
        volunteerId,
        body: {
          windows: rows.map((r) => ({
            date: r.date,
            start_time: `${r.start}:00`,
            end_time: `${r.end}:00`,
          })),
        },
      },
      { onSuccess: () => setDirty(false) },
    );
  };

  return (
    <div>
      <FieldLabel>
        {t('config.vol.avail.title')} <HelpTip text={t('config.vol.avail.hint')} />
      </FieldLabel>
      <div className="flex flex-col gap-[6px]">
        {rows.map((row, i) => (
          <div key={i} className="flex flex-wrap items-center gap-1">
            <select
              value={row.date}
              onChange={(e) => patch(i, { date: e.target.value })}
              className="min-w-0 flex-1 border-2 border-ink bg-cream p-[6px] font-mono text-[11px]"
            >
              {days.map((d) => (
                <option key={d} value={d}>
                  {shortDayLabel(`${d}T12:00`)}
                </option>
              ))}
            </select>
            <input
              type="time"
              value={row.start}
              onChange={(e) => patch(i, { start: e.target.value })}
              className="border-2 border-ink bg-cream p-[5px] font-mono text-[11px]"
            />
            <input
              type="time"
              value={row.end}
              onChange={(e) => patch(i, { end: e.target.value })}
              className="border-2 border-ink bg-cream p-[5px] font-mono text-[11px]"
            />
            <button
              type="button"
              onClick={() => {
                setDirty(true);
                setRows((rs) => rs.filter((_, j) => j !== i));
              }}
              aria-label={t('action.remove')}
              className="h-[26px] w-[26px] flex-none cursor-pointer border-2 border-ink bg-cream font-display text-[11px] font-bold hover:bg-orange"
            >
              ✕
            </button>
          </div>
        ))}
        {rows.length === 0 ? (
          <span className="font-mono text-[10px] opacity-55">{t('config.vol.avail.none')}</span>
        ) : null}
      </div>

      <div className="mt-2 flex gap-2">
        <button
          type="button"
          disabled={days.length === 0}
          onClick={() => {
            setDirty(true);
            setRows((rs) => [...rs, { date: days[0], start: '08:00', end: '18:00' }]);
          }}
          className="cursor-pointer border-2 border-ink bg-cream px-3 py-[6px] font-display text-[10px] font-extrabold uppercase hover:bg-yellow disabled:opacity-50"
        >
          + {t('config.vol.avail.add')}
        </button>
        <button
          type="button"
          disabled={!dirty || replace.isPending}
          onClick={save}
          className="cursor-pointer border-2 border-ink bg-yellow px-3 py-[6px] font-display text-[10px] font-extrabold uppercase hover:bg-green hover:text-white disabled:opacity-50"
        >
          {t('config.vol.avail.save')}
        </button>
      </div>
      {replace.isError ? <ErrorNote error={replace.error} /> : null}
    </div>
  );
}