import {
  Badge,
  Button,
  Card,
  CardContent,
  Checkbox,
  Command,
  CommandGroup,
  CommandItem,
  CommandList,
  ConfirmDialog,
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  IconSpinner,
  Input,
  Label,
} from '@plunk/ui';
import type {Workflow} from '@plunk/db';
import type {PaginatedResponse} from '@plunk/types';
import {EmptyState} from '@plunk/ui';
import {
  getCoreRowModel,
  useReactTable,
  type ColumnDef,
  type RowSelectionState,
  type SortingState,
  type VisibilityState,
} from '@tanstack/react-table';
import {DashboardLayout} from '../../components/DashboardLayout';
import {
  BulkActionBar,
  DataTable,
  DataTableColumnHeader,
  DataTableFacetedFilter,
  DataTableFilter,
  DataTableViewOptions,
  DataTableViewSwitcher,
  NoResultsState,
  isDataTableView,
  type DataTableColumnMeta,
  type DataTableView,
} from '../../components/data-table';
import {network} from '../../lib/network';
import {formatRelativeTime} from '../../lib/dateUtils';
import {useColumnVisibility} from '../../lib/hooks/useColumnVisibility';
import {usePersistentState} from '../../lib/hooks/usePersistentState';
import {useShiftClickSelection} from '../../lib/hooks/useShiftClickSelection';
import {Calendar, Copy, Edit, Plus, Power, PowerOff, Search, Trash2, Workflow as WorkflowIcon, X, Zap} from 'lucide-react';
import {NextSeo} from 'next-seo';
import Link from 'next/link';
import {useEffect, useMemo, useState} from 'react';
import {toast} from 'sonner';
import useSWR from 'swr';
import {WorkflowSchemas} from '@plunk/shared';
import dayjs from 'dayjs';

type WorkflowRow = Workflow & {_count?: {steps: number; executions: number}};

// Status facet values. Maps onto the API's `?status=active|disabled` filter
// (which the backend resolves to the `enabled` boolean).
type StatusFilter = 'ALL' | 'active' | 'disabled';

const VIEW_STORAGE_KEY = 'plunk:workflows:view';
const COLUMNS_STORAGE_KEY = 'plunk:workflows:columns';

// Fixed-value options for the Status column's faceted filter (table view) and
// the card-view pill row. Single source of truth for both.
const STATUS_OPTIONS: ReadonlyArray<{value: Exclude<StatusFilter, 'ALL'>; label: string}> = [
  {value: 'active', label: 'Active'},
  {value: 'disabled', label: 'Disabled'},
];

// Name + Actions are locked-visible (see lockedColumnIds below). `select` is
// also locked. Everything starts visible.
const DEFAULT_COLUMN_VISIBILITY: VisibilityState = {
  select: true,
  name: true,
  trigger: true,
  status: true,
  steps: true,
  updatedAt: true,
  actions: true,
};

export default function WorkflowsPage() {
  const [page, setPage] = useState(1);
  const [search, setSearch] = useState('');
  const [searchInput, setSearchInput] = useState('');
  const [statusFilter, setStatusFilter] = useState<StatusFilter>('ALL');
  const [showCreateDialog, setShowCreateDialog] = useState(false);
  const [showDeleteDialog, setShowDeleteDialog] = useState(false);
  const [workflowToDelete, setWorkflowToDelete] = useState<string | null>(null);
  const [showBulkDeleteDialog, setShowBulkDeleteDialog] = useState(false);
  const [bulkDeleteStatus, setBulkDeleteStatus] = useState<'idle' | 'loading'>('idle');
  const [view, setView] = usePersistentState<DataTableView>(VIEW_STORAGE_KEY, 'card', isDataTableView);

  // Tanstack table state.
  const [sorting, setSorting] = useState<SortingState>([]);
  const [columnVisibility, setColumnVisibility] = useColumnVisibility(COLUMNS_STORAGE_KEY, DEFAULT_COLUMN_VISIBILITY);
  // Row-selection state drives the BulkActionBar above the table.
  const [rowSelection, setRowSelection] = useState<RowSelectionState>({});

  // Build the sort query string from tanstack state. The backend is
  // authoritative (`?sort=<field>&dir=asc|desc`); without those params it falls
  // back to its default order. manualSorting is on, so the client only mirrors.
  const sortParam = sorting[0]?.id ?? '';
  const dirParam = sorting[0] ? (sorting[0].desc ? 'desc' : 'asc') : '';

  const {data, mutate, isLoading} = useSWR<PaginatedResponse<WorkflowRow>>(
    `/workflows?page=${page}&pageSize=20${search ? `&search=${encodeURIComponent(search)}` : ''}${
      statusFilter !== 'ALL' ? `&status=${statusFilter}` : ''
    }${sortParam ? `&sort=${sortParam}&dir=${dirParam}` : ''}`,
    {revalidateOnFocus: false},
  );

  useEffect(() => {
    const timer = setTimeout(() => {
      setSearch(searchInput);
      setPage(1);
    }, 350);
    return () => clearTimeout(timer);
  }, [searchInput]);

  // Clear row selection whenever the visible data set changes (page, search).
  // Selections only make sense for currently-visible rows — keeping a stale
  // selection across pagination would let the user bulk-delete workflows they
  // can no longer see.
  useEffect(() => {
    setRowSelection({});
  }, [page, search, statusFilter]);

  const handleDelete = async () => {
    if (!workflowToDelete) return;

    try {
      await network.fetch('DELETE', `/workflows/${workflowToDelete}`);
      toast.success('Workflow deleted successfully');
      void mutate();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : 'Failed to delete workflow');
    } finally {
      setWorkflowToDelete(null);
    }
  };

  const handleDuplicate = async (workflowId: string) => {
    try {
      await network.fetch('POST', `/workflows/${workflowId}/duplicate`);
      toast.success('Workflow duplicated successfully');
      void mutate();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : 'Failed to duplicate workflow');
    }
  };

  const handleToggleEnabled = async (workflowId: string, currentlyEnabled: boolean) => {
    try {
      await network.fetch<Workflow, typeof WorkflowSchemas.update>('PATCH', `/workflows/${workflowId}`, {
        enabled: !currentlyEnabled,
      });
      toast.success(`Workflow ${!currentlyEnabled ? 'enabled' : 'disabled'} successfully`);
      void mutate();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : 'Failed to toggle workflow');
    }
  };

  const selectedIds = useMemo(() => Object.keys(rowSelection).filter(id => rowSelection[id]), [rowSelection]);

  const handleBulkDelete = async () => {
    if (selectedIds.length === 0) return;
    setBulkDeleteStatus('loading');
    try {
      const result = await network.fetch<{deleted?: number}, typeof WorkflowSchemas.bulkUpdate>(
        'POST',
        '/workflows/bulk-update',
        {
          ids: selectedIds,
          delete: true,
        },
      );
      const count = result?.deleted ?? selectedIds.length;
      toast.success(`${count} workflow${count === 1 ? '' : 's'} deleted`);
      setRowSelection({});
      void mutate();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : 'Failed to delete workflows');
    } finally {
      // ConfirmDialog closes itself after onConfirm resolves.
      setBulkDeleteStatus('idle');
    }
  };

  const triggerEventName = (workflow: WorkflowRow): string | null =>
    workflow.triggerConfig && typeof workflow.triggerConfig === 'object' && 'eventName' in workflow.triggerConfig
      ? String(workflow.triggerConfig.eventName)
      : null;

  const columns = useMemo<Array<ColumnDef<WorkflowRow, unknown>>>(
    () => [
      {
        id: 'select',
        enableSorting: false,
        enableHiding: false, // Selection column is locked-visible.
        meta: {label: 'Select', headClassName: 'w-10', cellClassName: 'w-10'} satisfies DataTableColumnMeta,
        header: ({table}) => (
          <Checkbox
            aria-label="Select all rows on this page"
            checked={
              table.getIsAllPageRowsSelected()
                ? true
                : table.getIsSomePageRowsSelected()
                  ? 'indeterminate'
                  : false
            }
            onCheckedChange={value => table.toggleAllPageRowsSelected(!!value)}
          />
        ),
        cell: ({row}) => (
          <Checkbox
            aria-label={`Select ${row.original.name}`}
            checked={row.getIsSelected()}
            // Capture shift-key state before the toggle, then apply range
            // selection on change (see useShiftClickSelection below).
            onClick={e => {
              e.stopPropagation();
              shiftSelect.onClick(e);
            }}
            onCheckedChange={value => shiftSelect.onCheckedChange(row, value)}
          />
        ),
      },
      {
        id: 'name',
        accessorKey: 'name',
        enableHiding: false, // Name column is locked-visible.
        meta: {label: 'Name'} satisfies DataTableColumnMeta,
        header: ({column}) => <DataTableColumnHeader column={column}>Name</DataTableColumnHeader>,
        cell: ({row}) => (
          <Link
            href={`/workflows/${row.original.id}`}
            className="text-sm font-medium text-neutral-900 hover:text-neutral-700 focus-visible:outline-none focus-visible:underline"
          >
            {row.original.name}
          </Link>
        ),
      },
      {
        id: 'trigger',
        enableSorting: false, // No backend sort field for trigger.
        meta: {label: 'Trigger'} satisfies DataTableColumnMeta,
        header: ({column}) => <DataTableColumnHeader column={column}>Trigger</DataTableColumnHeader>,
        cell: ({row}) => {
          const eventName = triggerEventName(row.original);
          return eventName ? (
            <span className="inline-flex items-center gap-1.5 text-xs text-neutral-500">
              <Zap className="h-3 w-3 shrink-0" />
              <code className="font-mono bg-neutral-100 px-1.5 py-0.5 rounded text-neutral-700">{eventName}</code>
            </span>
          ) : (
            <span className="text-sm text-neutral-400">—</span>
          );
        },
      },
      {
        id: 'status',
        enableSorting: false, // Status is faceted-filtered, not sorted.
        meta: {label: 'Status'} satisfies DataTableColumnMeta,
        header: ({column}) => (
          <DataTableColumnHeader
            column={column}
            // Single-select facet — mirrors the API's `?status=active|disabled`
            // filter (Prisma `enabled` boolean). Matches the campaigns Status facet.
            filter={
              <DataTableFacetedFilter
                title="Status"
                multiple={false}
                options={STATUS_OPTIONS.map(s => ({value: s.value, label: s.label}))}
                selected={statusFilter === 'ALL' ? [] : [statusFilter]}
                onChange={next => {
                  setStatusFilter((next[0] as StatusFilter) ?? 'ALL');
                  setPage(1);
                }}
              />
            }
          >
            Status
          </DataTableColumnHeader>
        ),
        cell: ({row}) => (
          <Badge variant={row.original.enabled ? 'success' : 'neutral'} className="shrink-0">
            {row.original.enabled ? (
              <>
                <Power className="h-3 w-3 mr-1" />
                Active
              </>
            ) : (
              <>
                <PowerOff className="h-3 w-3 mr-1" />
                Disabled
              </>
            )}
          </Badge>
        ),
      },
      {
        id: 'steps',
        // Sorts by the related step count. The backend maps `?sort=steps` onto
        // Prisma's `orderBy: {steps: {_count}}`. Larger counts feel more natural
        // on the first click, so flip to descending first.
        enableSorting: true,
        sortDescFirst: true,
        meta: {label: 'Steps'} satisfies DataTableColumnMeta,
        header: ({column}) => <DataTableColumnHeader column={column}>Steps</DataTableColumnHeader>,
        cell: ({row}) => (
          <span className="text-sm text-neutral-700">
            <strong className="font-semibold text-neutral-900">{row.original._count?.steps ?? 0}</strong>
            <span className="text-neutral-400 ml-1 text-xs">steps</span>
          </span>
        ),
      },
      {
        id: 'updatedAt',
        accessorKey: 'updatedAt',
        // ISO-string values sort ascending on first click by default; flip so
        // the first click on "Updated" surfaces the most recently edited rows.
        sortDescFirst: true,
        meta: {label: 'Updated'} satisfies DataTableColumnMeta,
        header: ({column}) => <DataTableColumnHeader column={column}>Updated</DataTableColumnHeader>,
        cell: ({row}) => (
          <div className="group relative inline-block cursor-help text-sm text-neutral-500 whitespace-nowrap">
            {formatRelativeTime(row.original.updatedAt)}
            <div className="hidden group-hover:block absolute z-10 w-48 p-2 bg-neutral-900 text-white text-xs rounded shadow-md bottom-full left-1/2 transform -translate-x-1/2 mb-1 whitespace-nowrap">
              {dayjs(row.original.updatedAt).format('DD MMMM YYYY, hh:mm')}
            </div>
          </div>
        ),
      },
      {
        id: 'actions',
        enableSorting: false,
        enableHiding: false, // Actions column is locked-visible.
        meta: {label: 'Actions', headClassName: 'text-right', cellClassName: 'text-right'} satisfies DataTableColumnMeta,
        header: () => <span className="flex justify-end">Actions</span>,
        cell: ({row}) => (
          <div className="flex items-center justify-end gap-1">
            <Button
              variant="ghost"
              size="sm"
              title={row.original.enabled ? 'Disable workflow' : 'Enable workflow'}
              aria-label={row.original.enabled ? 'Disable workflow' : 'Enable workflow'}
              onClick={() => handleToggleEnabled(row.original.id, row.original.enabled)}
            >
              {row.original.enabled ? <PowerOff className="h-4 w-4" /> : <Power className="h-4 w-4" />}
            </Button>
            <Button asChild variant="ghost" size="sm" title="Edit workflow">
              <Link href={`/workflows/${row.original.id}`} aria-label="Edit workflow">
                <Edit className="h-4 w-4" />
              </Link>
            </Button>
            <Button
              variant="ghost"
              size="sm"
              title="Duplicate workflow"
              aria-label="Duplicate workflow"
              onClick={() => handleDuplicate(row.original.id)}
            >
              <Copy className="h-4 w-4" />
            </Button>
            <Button
              variant="ghost"
              size="sm"
              title="Delete workflow"
              aria-label="Delete workflow"
              onClick={() => {
                setWorkflowToDelete(row.original.id);
                setShowDeleteDialog(true);
              }}
            >
              <Trash2 className="h-4 w-4" />
            </Button>
          </div>
        ),
      },
    ],
    // Re-creating columns on every render is cheap and avoids stale-closure bugs
    // for the toggle/delete/duplicate handlers and the status-facet state.
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [statusFilter],
  );

  const table = useReactTable<WorkflowRow>({
    data: data?.data ?? [],
    columns,
    state: {sorting, columnVisibility, rowSelection},
    onSortingChange: setSorting,
    onColumnVisibilityChange: setColumnVisibility,
    onRowSelectionChange: setRowSelection,
    enableRowSelection: true,
    enableMultiSort: false,
    manualSorting: true, // Backend handles sorting; client just exposes ?sort=&dir=.
    getCoreRowModel: getCoreRowModel(),
    getRowId: row => row.id,
  });

  // Range (shift-click) selection for the checkbox column.
  const shiftSelect = useShiftClickSelection(table);

  const hasData = data && data.data.length > 0;

  // Whether any search/facet filter is currently narrowing the list. Drives the
  // "no results vs first-run empty" distinction below.
  const hasActiveFilters = search !== '' || statusFilter !== 'ALL';

  // Reset everything that can hide rows (search + status + pagination) so the
  // user can recover from a filter combination that matched nothing.
  const clearFilters = () => {
    setSearchInput('');
    setSearch('');
    setStatusFilter('ALL');
    setPage(1);
  };

  return (
    <>
      <NextSeo title="Workflows" />
      <DashboardLayout>
        <div className="space-y-6">
          {/* Header */}
          <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
            <div className="flex-1 min-w-0">
              <h1 className="text-2xl sm:text-3xl font-bold text-neutral-900">Workflows</h1>
              <p className="text-neutral-500 mt-2 text-sm sm:text-base">
                Automate your email campaigns with powerful workflows.{' '}
                {data?.total ? `${data.total} total workflows` : ''}
              </p>
            </div>
            <Button onClick={() => setShowCreateDialog(true)} className="w-full sm:w-auto">
              <Plus className="h-4 w-4" />
              <span className="hidden sm:inline">Create Workflow</span>
              <span className="sm:hidden">Create</span>
            </Button>
          </div>

          {/* Control row. One aligned cluster of 32px-tall controls:
              - Search input: always present (both views).
              - Status filter: CARD VIEW ONLY, as a toolbar dropdown matching the
                Columns selector. In table view the Status filter lives in the
                column header facet instead (same shared menu body).
              - Columns selector: TABLE VIEW ONLY.
              - A hairline divider separates the data controls (filter/columns)
                from the layout control (view switcher). */}
          <div className="flex flex-col sm:flex-row sm:items-center gap-3">
            <div className="relative flex-1">
              <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-neutral-400" />
              <Input
                type="text"
                placeholder="Search workflows..."
                value={searchInput}
                onChange={e => setSearchInput(e.target.value)}
                className="pl-10 pr-10 h-8 text-xs"
              />
              {searchInput && (
                <button
                  type="button"
                  aria-label="Clear search"
                  onClick={() => {
                    setSearchInput('');
                    setSearch('');
                    setPage(1);
                  }}
                  className="absolute right-3 top-1/2 -translate-y-1/2 text-neutral-400 hover:text-neutral-600 transition-colors"
                >
                  <X className="h-4 w-4" />
                </button>
              )}
            </div>
            <div className="flex items-center gap-2 shrink-0">
              {view === 'card' && (
                <DataTableFilter
                  title="Status"
                  multiple={false}
                  options={STATUS_OPTIONS.map(s => ({value: s.value, label: s.label}))}
                  selected={statusFilter === 'ALL' ? [] : [statusFilter]}
                  onChange={next => {
                    setStatusFilter((next[0] as StatusFilter) ?? 'ALL');
                    setPage(1);
                  }}
                />
              )}
              {view === 'table' && (
                <DataTableViewOptions table={table} lockedColumnIds={['select', 'name', 'actions']} />
              )}
              <span className="hidden sm:block h-5 w-px bg-neutral-200" aria-hidden="true" />
              <DataTableViewSwitcher view={view} onChange={setView} />
            </div>
          </div>

          {/* Bulk action bar — table view only (the selection column lives
              there). Wires the delete action; the children slot stays open for
              future bulk operations. */}
          {view === 'table' && (
            <BulkActionBar selectedCount={selectedIds.length} itemNoun="workflow" onClear={() => setRowSelection({})}>
              <Button
                type="button"
                variant="destructive"
                size="sm"
                onClick={() => setShowBulkDeleteDialog(true)}
                disabled={bulkDeleteStatus === 'loading'}
              >
                <Trash2 className="h-4 w-4" />
                Delete selected
              </Button>
            </BulkActionBar>
          )}

          {/* Workflows */}
          <div>
            {isLoading ? (
              <Card>
                <CardContent className="pt-6">
                  <div className="flex items-center justify-center py-12">
                    <IconSpinner />
                  </div>
                </CardContent>
              </Card>
            ) : !hasData ? (
              <Card>
                <CardContent>
                  {hasActiveFilters ? (
                    // Items exist, but the active search/status filters matched
                    // none — offer a one-click recovery.
                    <NoResultsState icon={WorkflowIcon} itemNoun="workflows" onClear={clearFilters} />
                  ) : (
                    // Genuinely empty project — first-run state.
                    <EmptyState
                      icon={WorkflowIcon}
                      title="No workflows yet"
                      description="Automate emails triggered by contact events."
                      action={
                        <Button onClick={() => setShowCreateDialog(true)}>
                          <Plus className="h-4 w-4" />
                          Create Workflow
                        </Button>
                      }
                    />
                  )}
                </CardContent>
              </Card>
            ) : view === 'card' ? (
              <>
                {/* Card Grid View — unchanged from before. */}
                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  {data?.data.map(workflow => (
                    <Card key={workflow.id} className="transition-colors hover:border-neutral-300 flex flex-col [&:has([data-card-link]:focus-visible)]:ring-2 [&:has([data-card-link]:focus-visible)]:ring-ring [&:has([data-card-link]:focus-visible)]:ring-offset-2">
                      <Link
                        href={`/workflows/${workflow.id}`}
                        data-card-link=""
                        className="flex-1 block p-6 pb-4 hover:bg-neutral-50/50 transition-colors rounded-t-xl focus-visible:outline-none"
                        aria-label={`Open ${workflow.name}`}
                      >
                        <div className="flex items-start justify-between gap-3 mb-3">
                          <h3 className="font-semibold text-neutral-900 leading-snug">{workflow.name}</h3>
                          <Badge variant={workflow.enabled ? 'success' : 'neutral'} className="shrink-0 mt-0.5">
                            {workflow.enabled ? (
                              <><Power className="h-3 w-3 mr-1" />Active</>
                            ) : (
                              <><PowerOff className="h-3 w-3 mr-1" />Disabled</>
                            )}
                          </Badge>
                        </div>
                        {workflow.triggerConfig &&
                          typeof workflow.triggerConfig === 'object' &&
                          'eventName' in workflow.triggerConfig && (
                            <div className="flex items-center gap-1.5 text-xs text-neutral-500 mb-3">
                              <Zap className="h-3 w-3 shrink-0" />
                              <span>Triggers on</span>
                              <code className="font-mono bg-neutral-100 px-1.5 py-0.5 rounded text-neutral-700">
                                {String(workflow.triggerConfig.eventName)}
                              </code>
                            </div>
                          )}
                        <div className="flex items-center gap-4 text-sm">
                          <span>
                            <strong className="font-semibold text-neutral-900">{workflow._count?.steps ?? 0}</strong>
                            <span className="text-neutral-400 ml-1 text-xs">steps</span>
                          </span>
                          <span className="h-3 w-px bg-neutral-200" />
                          <span>
                            <strong className="font-semibold text-neutral-900">{workflow._count?.executions ?? 0}</strong>
                            <span className="text-neutral-400 ml-1 text-xs">executions</span>
                          </span>
                        </div>
                      </Link>
                      <div className="px-6 py-3 border-t border-neutral-100 flex items-center justify-between">
                        <div className="flex items-center gap-1.5 text-xs text-neutral-400">
                          <Calendar className="h-3 w-3" />
                          <div className="group relative inline-block cursor-help">
                            <span>Updated {formatRelativeTime(workflow.updatedAt)}</span>
                            <div className="hidden group-hover:block absolute z-10 w-48 p-2 bg-neutral-900 text-white text-xs rounded shadow-md bottom-full left-0 mb-1 whitespace-nowrap">
                              {dayjs(workflow.updatedAt).format('DD MMMM YYYY, hh:mm')}
                            </div>
                          </div>
                        </div>
                        <div className="flex items-center gap-1">
                          <Button
                            variant="ghost"
                            size="sm"
                            title={workflow.enabled ? 'Disable workflow' : 'Enable workflow'}
                            onClick={() => handleToggleEnabled(workflow.id, workflow.enabled)}
                          >
                            {workflow.enabled ? <PowerOff className="h-4 w-4" /> : <Power className="h-4 w-4" />}
                          </Button>
                          <Button asChild variant="ghost" size="sm" title="Edit workflow">
                            <Link href={`/workflows/${workflow.id}`} aria-label="Edit workflow"><Edit className="h-4 w-4" /></Link>
                          </Button>
                          <Button
                            variant="ghost"
                            size="sm"
                            title="Duplicate workflow"
                            onClick={() => handleDuplicate(workflow.id)}
                          >
                            <Copy className="h-4 w-4" />
                          </Button>
                          <Button
                            variant="ghost"
                            size="sm"
                            title="Delete workflow"
                            onClick={() => {
                              setWorkflowToDelete(workflow.id);
                              setShowDeleteDialog(true);
                            }}
                          >
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        </div>
                      </div>
                    </Card>
                  ))}
                </div>

                {/* Pagination */}
                {data && data.totalPages > 1 && (
                  <div className="flex items-center justify-between mt-6">
                    <p className="text-sm text-neutral-500">
                      Showing {(page - 1) * data.pageSize + 1} to {Math.min(page * data.pageSize, data.total)} of{' '}
                      {data.total} workflows
                    </p>
                    <div className="flex items-center gap-2">
                      <Button variant="outline" size="sm" onClick={() => setPage(p => p - 1)} disabled={page === 1}>
                        Previous
                      </Button>
                      <span className="text-sm text-neutral-700">
                        Page {page} of {data.totalPages}
                      </span>
                      <Button
                        variant="outline"
                        size="sm"
                        onClick={() => setPage(p => p + 1)}
                        disabled={page === data.totalPages}
                      >
                        Next
                      </Button>
                    </div>
                  </div>
                )}
              </>
            ) : (
              <>
                {/* Table View (tanstack-driven) */}
                <Card>
                  <CardContent className="p-0">
                    <DataTable table={table} />
                  </CardContent>
                </Card>

                {/* Pagination */}
                {data && data.totalPages > 1 && (
                  <div className="flex items-center justify-between mt-6">
                    <p className="text-sm text-neutral-500">
                      Showing {(page - 1) * data.pageSize + 1} to {Math.min(page * data.pageSize, data.total)} of{' '}
                      {data.total} workflows
                    </p>
                    <div className="flex items-center gap-2">
                      <Button variant="outline" size="sm" onClick={() => setPage(p => p - 1)} disabled={page === 1}>
                        Previous
                      </Button>
                      <span className="text-sm text-neutral-700">
                        Page {page} of {data.totalPages}
                      </span>
                      <Button
                        variant="outline"
                        size="sm"
                        onClick={() => setPage(p => p + 1)}
                        disabled={page === data.totalPages}
                      >
                        Next
                      </Button>
                    </div>
                  </div>
                )}
              </>
            )}
          </div>
        </div>

        {/* Create Workflow Dialog */}
        <CreateWorkflowDialog open={showCreateDialog} onOpenChange={setShowCreateDialog} onSuccess={() => mutate()} />

        <ConfirmDialog
          open={showDeleteDialog}
          onOpenChange={setShowDeleteDialog}
          onConfirm={handleDelete}
          title="Delete Workflow"
          description="Are you sure you want to delete this workflow? This action cannot be undone."
          confirmText="Delete"
          variant="destructive"
        />

        <ConfirmDialog
          open={showBulkDeleteDialog}
          onOpenChange={setShowBulkDeleteDialog}
          onConfirm={handleBulkDelete}
          title={`Delete ${selectedIds.length} workflow${selectedIds.length === 1 ? '' : 's'}`}
          description="Are you sure you want to delete the selected workflows? This action cannot be undone. Workflows with active executions will block the operation."
          confirmText="Delete"
          variant="destructive"
          status={bulkDeleteStatus}
        />
      </DashboardLayout>
    </>
  );
}

interface CreateWorkflowDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSuccess: () => void;
}

function CreateWorkflowDialog({open, onOpenChange, onSuccess}: CreateWorkflowDialogProps) {
  const [name, setName] = useState('');
  const [description, setDescription] = useState('');
  const [eventName, setEventName] = useState('');
  const [eventPopoverOpen, setEventPopoverOpen] = useState(false);
  const [allowReentry, setAllowReentry] = useState(false);
  const [isSubmitting, setIsSubmitting] = useState(false);

  // Fetch available event names
  const {data: eventNamesData} = useSWR<{eventNames: string[]}>(open ? '/events/names' : null, {
    revalidateOnFocus: false,
  });

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsSubmitting(true);

    try {
      const workflow = await network.fetch<Workflow, typeof WorkflowSchemas.create>('POST', '/workflows', {
        name,
        description: description || undefined,
        eventName: eventName.trim(),
        allowReentry,
        enabled: false,
      });

      toast.success('Workflow created successfully');
      setName('');
      setDescription('');
      setEventName('');
      setAllowReentry(false);
      onOpenChange(false);
      onSuccess();

      // Redirect to the workflow editor
      window.location.href = `/workflows/${workflow.id}`;
    } catch (error) {
      toast.error(error instanceof Error ? error.message : 'Failed to create workflow');
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle>Create New Workflow</DialogTitle>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div className="space-y-1.5">
            <Label htmlFor="name">Name *</Label>
            <Input
              id="name"
              type="text"
              value={name}
              onChange={e => setName(e.target.value)}
              required
              placeholder="Welcome Email Sequence"
            />
          </div>

          <div className="space-y-1.5">
            <Label htmlFor="description">Description</Label>
            <textarea
              id="description"
              value={description}
              onChange={e => setDescription(e.target.value)}
              placeholder="Send a series of welcome emails to new subscribers"
              className="w-full px-3 py-2 border border-neutral-200 rounded-md text-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
              rows={3}
            />
          </div>

          <div className="space-y-1.5">
            <Label htmlFor="createEventName">Trigger Event *</Label>
            {/* Combobox: 可自由輸入 event name，同時提供已追蹤 event 的下拉建議 */}
            <div className="relative">
              <Input
                id="createEventName"
                type="text"
                value={eventName}
                onChange={e => {
                  setEventName(e.target.value);
                  setEventPopoverOpen(true);
                }}
                onFocus={() => setEventPopoverOpen(true)}
                onBlur={() => {
                  // 延遲關閉，讓 CommandItem 的 onSelect 有時間觸發
                  setTimeout(() => setEventPopoverOpen(false), 150);
                }}
                placeholder="e.g., contact.created, email.opened"
                required
                autoComplete="off"
              />
              {eventPopoverOpen && ((eventNamesData?.eventNames?.length ?? 0) > 0 || eventName?.trim()) && (
                <div className="absolute z-50 w-full mt-1 rounded-md border border-neutral-200 bg-white shadow-md">
                  <Command>
                    <CommandList>
                      <CommandGroup>
                        {eventNamesData?.eventNames
                          ?.filter(n => !eventName || n.toLowerCase().includes(eventName.toLowerCase()))
                          .map(n => (
                            <CommandItem
                              key={n}
                              value={n}
                              onSelect={() => {
                                setEventName(n);
                                setEventPopoverOpen(false);
                              }}
                            >
                              {n}
                            </CommandItem>
                          ))}
                        {eventName?.trim() && !eventNamesData?.eventNames?.some(n => n === eventName.trim()) && (
                          <CommandItem
                            key="__custom__"
                            value={eventName.trim()}
                            onSelect={() => {
                              setEventName(eventName.trim());
                              setEventPopoverOpen(false);
                            }}
                          >
                            Use &ldquo;{eventName.trim()}&rdquo;
                          </CommandItem>
                        )}
                      </CommandGroup>
                    </CommandList>
                  </Command>
                </div>
              )}
            </div>
            <p className="text-xs text-neutral-500 mt-1">
              The event that triggers this workflow to start for a contact
            </p>
          </div>

          <div className="flex items-start gap-3">
            <input
              id="allowReentry"
              type="checkbox"
              checked={allowReentry}
              onChange={e => setAllowReentry(e.target.checked)}
              className="mt-0.5 h-4 w-4 text-neutral-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 border-neutral-300 rounded"
            />
            <div className="flex-1">
              <Label htmlFor="allowReentry" className="font-medium cursor-pointer">
                Allow Re-entry
              </Label>
              <p className="text-xs text-neutral-500 mt-0.5">
                When enabled, contacts can enter this workflow multiple times.
              </p>
            </div>
          </div>

          <DialogFooter className="flex-col sm:flex-row gap-2">
            <Button
              type="button"
              variant="outline"
              onClick={() => onOpenChange(false)}
              disabled={isSubmitting}
              className="w-full sm:w-auto"
            >
              Cancel
            </Button>
            <Button type="submit" disabled={isSubmitting} className="w-full sm:w-auto">
              {isSubmitting ? 'Creating...' : 'Create Workflow'}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}
