import { useState } from 'react';
import { Plus, Save, Trash2 } from 'lucide-react';
import { useUi } from '../../context/ui-context.jsx';
import { useAuth } from '../../context/auth-context.jsx';
import { useAsync, useAction } from '../../hooks/useAsync.js';
import { listActivitiesByProject, createActivity, getActivity, deleteActivity, reorderActivities } from '../../services/activities.js';
import { listCatalog } from '../../services/catalogs.js';
import { listUsers } from '../../services/users.js';
import { ListView } from '../../components/ListView.jsx';
import { SearchInput } from '../../components/SearchInput.jsx';
import { Button } from '../../components/Button.jsx';
import { Field, FieldRow } from '../../components/Field.jsx';
import { ComboBox } from '../../components/ComboBox.jsx';
import { StatusBadge, ProgressBar, DueBadge } from '../../components/StatusBadge.jsx';
import { dueStatus } from '../../utils/dueStatus.js';
import { DetailPopup } from '../../components/DetailPopup.jsx';
import ActivityDetailPanel from './ActivityDetailPanel.jsx';

const EMPTY_FORM = { name: '', description: '', responsibleUserId: '', priorityId: '', statusId: '', startDate: '', dueDate: '', isMilestone: false };

export default function ProjectActivitiesTab({ projectId }) {
  const { t, pushToast, openDialog } = useUi();
  const { user: currentUser } = useAuth();
  const runAction = useAction();
  const { data: activities, reload } = useAsync(() => listActivitiesByProject(projectId), [projectId]);
  const { data: priorities } = useAsync(() => listCatalog('priorities'), []);
  const { data: statuses } = useAsync(() => listCatalog('activity-statuses'), []);
  const { data: users } = useAsync(listUsers, []);

  const [search, setSearch] = useState('');
  const [creating, setCreating] = useState(false);
  const [form, setForm] = useState(EMPTY_FORM);
  const [selected, setSelected] = useState(null);

  const priorityOptions = (priorities || []).map((p) => ({ value: p.id, label: p.name }));
  const statusOptions = (statuses || []).map((s) => ({ value: s.id, label: s.name }));
  const userOptions = (users || []).map((u) => ({ value: u.id, label: u.name }));

  async function save() {
    if (!form.name.trim() || !form.priorityId || !form.statusId) return;
    await runAction(async () => {
      await createActivity(projectId, { ...form, responsibleUserId: form.responsibleUserId || null });
      setCreating(false);
      setForm(EMPTY_FORM);
      pushToast({ tone: 'success', message: t('common_saved') });
      await reload();
    });
  }

  async function openActivity(row) {
    const full = await getActivity(row.id);
    setSelected(full);
  }

  async function refreshAll() {
    await reload();
    if (selected) setSelected(await getActivity(selected.id));
  }

  async function handleReorder(ids) {
    await reorderActivities(projectId, ids);
    await reload();
  }

  function confirmDelete(row) {
    openDialog({
      tone: 'warning',
      title: t('common_confirm_delete_title'),
      message: t('common_confirm_delete_msg'),
      actions: [
        { label: t('common_cancel'), variant: 'standard' },
        {
          label: t('common_delete'), variant: 'danger',
          onClick: () => runAction(async () => {
            await deleteActivity(row.id);
            await reload();
            pushToast({ tone: 'success', message: t('common_saved') });
          }),
        },
      ],
    });
  }

  const columns = [
    { key: 'code', label: t('activity_code') },
    { key: 'name', label: t('common_name') },
    { key: 'responsible_name', label: t('common_responsible'), render: (r) => r.responsible_name || '—' },
    { key: 'status_name', label: t('common_status'), render: (r) => <StatusBadge name={r.status_name} color={r.status_color} /> },
    { key: 'priority_name', label: t('common_priority'), render: (r) => <StatusBadge name={r.priority_name} color={r.priority_color} /> },
    { key: 'due_date', label: t('activity_due_date'), render: (r) => (
      <div style={{ display: 'flex', alignItems: 'center', gap: 6 }}>
        <span>{r.due_date || '—'}</span>
        <DueBadge status={dueStatus(r.due_date, r.status_is_closed)} />
      </div>
    ) },
    { key: 'progress_pct', label: t('activity_progress'), render: (r) => <div style={{ width: 100 }}><ProgressBar value={Number(r.progress_pct)} /></div> },
    { key: 'updated_at', label: t('activity_updated_at'), render: (r) => <span style={{ whiteSpace: 'nowrap' }}>{String(r.updated_at).slice(0, 16)}</span> },
  ];

  if (!activities) return <div className="text-muted">{t('common_loading')}</div>;

  return (
    <div>
      <div className="toolbar">
        <SearchInput value={search} onChange={setSearch} />
        <Button variant="accent" icon={Plus} onClick={() => setCreating(true)}>{t('activity_new')}</Button>
      </div>

      <ListView
        columns={columns}
        rows={activities}
        searchValue={search}
        getSearchHaystack={(a) => `${a.code} ${a.name} ${a.responsible_name || ''}`}
        getRowKey={(a) => a.id}
        onRowClick={openActivity}
        onReorder={currentUser?.roleCode !== 'viewer' ? handleReorder : undefined}
        rowActions={currentUser?.roleCode !== 'viewer' ? (a) => [
          { label: t('common_delete'), icon: Trash2, danger: true, onClick: () => confirmDelete(a) },
        ] : undefined}
      />

      <DetailPopup open={creating} title={t('activity_new')} onClose={() => setCreating(false)} width={640} height={560}>
        <Field label={t('common_name')}>
          <input className="input" value={form.name} onChange={(e) => setForm((f) => ({ ...f, name: e.target.value }))} autoFocus />
        </Field>
        <Field label={t('common_description')}>
          <textarea className="textarea" value={form.description} onChange={(e) => setForm((f) => ({ ...f, description: e.target.value }))} />
        </Field>
        <FieldRow>
          <Field label={t('common_responsible')}>
            <ComboBox options={[{ value: '', label: '—' }, ...userOptions]} value={form.responsibleUserId} onChange={(v) => setForm((f) => ({ ...f, responsibleUserId: v }))} />
          </Field>
          <Field label={t('common_priority')}>
            <ComboBox options={priorityOptions} value={form.priorityId} onChange={(v) => setForm((f) => ({ ...f, priorityId: v }))} />
          </Field>
          <Field label={t('common_status')}>
            <ComboBox options={statusOptions} value={form.statusId} onChange={(v) => setForm((f) => ({ ...f, statusId: v }))} />
          </Field>
        </FieldRow>
        <FieldRow>
          <Field label={t('activity_start_date')}>
            <input className="input" type="date" value={form.startDate} onChange={(e) => setForm((f) => ({ ...f, startDate: e.target.value }))} />
          </Field>
          <Field label={t('activity_due_date')}>
            <input className="input" type="date" value={form.dueDate} onChange={(e) => setForm((f) => ({ ...f, dueDate: e.target.value }))} />
          </Field>
          <Field label={t('activity_milestone')}>
            <label className="checkbox-row">
              <input type="checkbox" checked={form.isMilestone} onChange={(e) => setForm((f) => ({ ...f, isMilestone: e.target.checked }))} />
              {t('activity_milestone')}
            </label>
          </Field>
        </FieldRow>
        <div style={{ display: 'flex', gap: 8 }}>
          <Button variant="accent" icon={Save} onClick={save}>{t('common_save')}</Button>
          <Button variant="standard" onClick={() => setCreating(false)}>{t('common_cancel')}</Button>
        </div>
      </DetailPopup>

      <DetailPopup open={!!selected} title={selected ? `${selected.code} — ${selected.name}` : ''} onClose={() => setSelected(null)} width={720} height={680}>
        {selected && (
          <ActivityDetailPanel
            activity={selected}
            projectId={projectId}
            siblingActivities={activities}
            onChanged={refreshAll}
          />
        )}
      </DetailPopup>
    </div>
  );
}