'use client';

import { useState } from 'react';
import { useParams } from 'next/navigation';
import { Plus, Archive, Tag as TagIcon, TagsIcon, Trash2 } from 'lucide-react';
import { useMutation, useQueryClient } from '@tanstack/react-query';
import { toast } from 'sonner';

import { Button } from '@/components/ui/button';
import { DataTable } from '@/components/shared/data-table';
import { FilterBar } from '@/components/shared/filter-bar';
import { SavedViewsDropdown } from '@/components/shared/saved-views-dropdown';
import { SaveViewDialog } from '@/components/shared/save-view-dialog';
import { PageHeader } from '@/components/shared/page-header';
import { EmptyState } from '@/components/shared/empty-state';
import { TableSkeleton } from '@/components/shared/loading-skeleton';
import { ArchiveConfirmDialog } from '@/components/shared/archive-confirm-dialog';
import { PermissionGate } from '@/components/shared/permission-gate';
import { TagPicker } from '@/components/shared/tag-picker';
import { BulkHardDeleteDialog } from '@/components/clients/bulk-hard-delete-dialog';
import { BulkArchiveWizard } from '@/components/clients/bulk-archive-wizard';
import { usePermissions } from '@/hooks/use-permissions';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { ClientForm } from '@/components/clients/client-form';
import { clientFilterDefinitions } from '@/components/clients/client-filters';
import { ClientCard } from '@/components/clients/client-card';
import {
  CLIENT_COLUMN_OPTIONS,
  CLIENT_DEFAULT_HIDDEN,
  getClientColumns,
  type ClientRow,
} from '@/components/clients/client-columns';
import { ColumnPicker } from '@/components/shared/column-picker';
import { useCreateFromUrl } from '@/hooks/use-create-from-url';
import { usePaginatedQuery } from '@/hooks/use-paginated-query';
import { useRealtimeInvalidation } from '@/hooks/use-realtime-invalidation';
import { useTablePreferences } from '@/hooks/use-table-preferences';
import { apiFetch } from '@/lib/api/client';

export function ClientList() {
  const params = useParams<{ portSlug: string }>();
  const portSlug = params?.portSlug ?? '';
  const queryClient = useQueryClient();

  const [createOpen, setCreateOpen] = useState(false);
  useCreateFromUrl(() => setCreateOpen(true));
  const [editClient, setEditClient] = useState<ClientRow | null>(null);
  const [archiveClient, setArchiveClient] = useState<ClientRow | null>(null);
  const [tagDialog, setTagDialog] = useState<{ ids: string[]; mode: 'add' | 'remove' } | null>(
    null,
  );
  const [tagChoice, setTagChoice] = useState<string[]>([]);
  const [bulkDeleteIds, setBulkDeleteIds] = useState<string[]>([]);
  const [bulkArchiveIds, setBulkArchiveIds] = useState<string[]>([]);
  const [saveViewOpen, setSaveViewOpen] = useState(false);

  const { can } = usePermissions();
  const canHardDelete = can('admin', 'permanently_delete_clients');
  const canBulkArchive = can('clients', 'delete');
  const canBulkTag = can('clients', 'edit');

  const {
    data,
    pagination,
    isLoading,
    isFetching,
    sort,
    setSort,
    setPage,
    setPageSize,
    filters,
    setFilter,
    clearFilters,
  } = usePaginatedQuery<ClientRow>({
    queryKey: ['clients'],
    endpoint: '/api/v1/clients',
    filterDefinitions: clientFilterDefinitions,
  });

  useRealtimeInvalidation({
    'client:created': [['clients']],
    'client:updated': [['clients']],
    'client:archived': [['clients']],
    'client:restored': [['clients']],
  });

  const archiveMutation = useMutation({
    mutationFn: (id: string) => apiFetch(`/api/v1/clients/${id}`, { method: 'DELETE' }),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['clients'] });
      setArchiveClient(null);
    },
  });

  const bulkMutation = useMutation({
    mutationFn: async (
      payload:
        | { action: 'archive'; ids: string[] }
        | { action: 'add_tag'; ids: string[]; tagId: string }
        | { action: 'remove_tag'; ids: string[]; tagId: string },
    ) =>
      apiFetch<{ data: { summary: { total: number; succeeded: number; failed: number } } }>(
        '/api/v1/clients/bulk',
        { method: 'POST', body: payload },
      ),
    onSuccess: (res) => {
      queryClient.invalidateQueries({ queryKey: ['clients'] });
      const s = res.data.summary;
      if (s.failed > 0) {
        toast.warning(`${s.succeeded} of ${s.total} succeeded. ${s.failed} failed.`);
      } else if (s.succeeded > 0) {
        toast.success(`${s.succeeded} client${s.succeeded === 1 ? '' : 's'} updated.`);
      }
    },
    onError: (err: unknown) => {
      toast.error(err instanceof Error ? err.message : 'Bulk action failed');
    },
  });

  const columns = getClientColumns({
    portSlug,
    onEdit: (client) => setEditClient(client),
    onArchive: (client) => setArchiveClient(client),
  });

  // Per-user column visibility, persisted into user_profiles.preferences
  // via /api/v1/me. Hidden IDs are the source of truth — `actions` and
  // `select` columns aren't user-toggleable so they're never in the
  // hidden set. New columns surface for existing users by default.
  const { hidden, setHidden } = useTablePreferences('clients', CLIENT_DEFAULT_HIDDEN);
  const columnVisibility = Object.fromEntries(hidden.map((id) => [id, false]));

  return (
    <div className="space-y-4">
      <PageHeader
        title="Clients"
        description="Manage your client records"
        variant="gradient"
      />

      <div className="flex flex-wrap items-center gap-2">
        <FilterBar
          filters={clientFilterDefinitions}
          values={filters}
          onChange={setFilter}
          onClear={clearFilters}
        />
        <SavedViewsDropdown
          entityType="clients"
          onApplyView={(savedFilters, _savedSort) => {
            clearFilters();
            Object.entries(savedFilters).forEach(([key, val]) => setFilter(key, val));
          }}
        />
        <ColumnPicker
          columns={CLIENT_COLUMN_OPTIONS}
          hidden={hidden}
          onChange={setHidden}
          onSaveView={() => setSaveViewOpen(true)}
        />
        {/* New Client moved out of PageHeader actions and into the
            filter row. Saves a row on mobile (no more dedicated
            actions strip). ml-auto keeps the primary action at the
            far-right edge, which is where reps look first. */}
        <PermissionGate resource="clients" action="create">
          <Button size="sm" className="ml-auto" onClick={() => setCreateOpen(true)}>
            <Plus className="mr-1.5 h-4 w-4" />
            New Client
          </Button>
        </PermissionGate>
      </div>

      <SaveViewDialog
        open={saveViewOpen}
        onOpenChange={setSaveViewOpen}
        entityType="clients"
        currentFilters={filters}
        currentSort={sort}
      />

      {isLoading ? (
        <TableSkeleton />
      ) : (
        <DataTable
          columns={columns}
          columnVisibility={columnVisibility}
          data={data}
          pagination={pagination}
          onPaginationChange={(p, ps) => {
            setPage(p);
            setPageSize(ps);
          }}
          sort={sort}
          onSortChange={setSort}
          isLoading={isFetching && !isLoading}
          getRowId={(row) => row.id}
          bulkActions={[
            ...(canBulkTag
              ? [
                  {
                    label: 'Add tag',
                    icon: TagIcon,
                    onClick: (ids: string[]) => {
                      if (ids.length === 0) return;
                      setTagChoice([]);
                      setTagDialog({ ids, mode: 'add' });
                    },
                  },
                  {
                    label: 'Remove tag',
                    icon: TagsIcon,
                    onClick: (ids: string[]) => {
                      if (ids.length === 0) return;
                      setTagChoice([]);
                      setTagDialog({ ids, mode: 'remove' });
                    },
                  },
                ]
              : []),
            ...(canBulkArchive
              ? [
                  {
                    label: 'Archive',
                    icon: Archive,
                    variant: 'destructive' as const,
                    onClick: (ids: string[]) => {
                      if (ids.length === 0) return;
                      setBulkArchiveIds(ids);
                    },
                  },
                ]
              : []),
            ...(canHardDelete
              ? [
                  {
                    label: 'Permanently delete (archived only)',
                    icon: Trash2,
                    variant: 'destructive' as const,
                    onClick: (ids: string[]) => {
                      if (ids.length === 0) return;
                      setBulkDeleteIds(ids);
                    },
                  },
                ]
              : []),
          ]}
          cardRender={(row) => (
            <ClientCard
              client={row.original}
              portSlug={portSlug}
              onEdit={setEditClient}
              onArchive={setArchiveClient}
            />
          )}
          emptyState={
            <EmptyState
              title="No clients found"
              description="Get started by adding your first client."
              action={{ label: 'New Client', onClick: () => setCreateOpen(true) }}
            />
          }
        />
      )}

      {/* Bulk tag add/remove */}
      <Dialog open={!!tagDialog} onOpenChange={(o) => !o && setTagDialog(null)}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>{tagDialog?.mode === 'add' ? 'Add tag' : 'Remove tag'}</DialogTitle>
            <DialogDescription>
              {tagDialog?.mode === 'add'
                ? `Add a tag to ${tagDialog?.ids.length ?? 0} selected client${tagDialog?.ids.length === 1 ? '' : 's'}.`
                : `Remove a tag from ${tagDialog?.ids.length ?? 0} selected client${tagDialog?.ids.length === 1 ? '' : 's'}. Clients without the tag are unchanged.`}
            </DialogDescription>
          </DialogHeader>
          <div className="py-2">
            <TagPicker
              selectedIds={tagChoice}
              onChange={(ids) => setTagChoice(ids.slice(-1))}
              placeholder="Pick one tag…"
            />
            <p className="text-xs text-muted-foreground mt-2">
              Pick a single tag. To apply multiple tags, run the action once per tag.
            </p>
          </div>
          <DialogFooter>
            <Button variant="outline" onClick={() => setTagDialog(null)}>
              Cancel
            </Button>
            <Button
              disabled={bulkMutation.isPending || tagChoice.length === 0}
              onClick={() => {
                if (!tagDialog || tagChoice.length === 0) return;
                const tagId = tagChoice[0];
                if (!tagId) return;
                bulkMutation.mutate(
                  {
                    action: tagDialog.mode === 'add' ? 'add_tag' : 'remove_tag',
                    ids: tagDialog.ids,
                    tagId,
                  },
                  { onSettled: () => setTagDialog(null) },
                );
              }}
            >
              Apply
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>

      <ClientForm open={createOpen} onOpenChange={setCreateOpen} />

      {editClient && (
        <ClientForm
          open={!!editClient}
          onOpenChange={(open) => !open && setEditClient(null)}
          client={editClient as unknown as NonNullable<Parameters<typeof ClientForm>[0]['client']>}
        />
      )}

      <ArchiveConfirmDialog
        open={!!archiveClient}
        onOpenChange={(open) => !open && setArchiveClient(null)}
        entityName={archiveClient?.fullName ?? ''}
        entityType="Client"
        isArchived={false}
        onConfirm={() => archiveClient && archiveMutation.mutate(archiveClient.id)}
        isLoading={archiveMutation.isPending}
      />

      <BulkHardDeleteDialog
        open={bulkDeleteIds.length > 0}
        onOpenChange={(open) => !open && setBulkDeleteIds([])}
        clientIds={bulkDeleteIds}
        onDeleted={() => setBulkDeleteIds([])}
      />

      <BulkArchiveWizard
        open={bulkArchiveIds.length > 0}
        onOpenChange={(open) => !open && setBulkArchiveIds([])}
        clientIds={bulkArchiveIds}
        onSuccess={() => setBulkArchiveIds([])}
      />
    </div>
  );
}