import { useState, useMemo, useEffect } from 'react'
import { useQuery } from '@tanstack/react-query'
import { getRouteApi } from '@tanstack/react-router'
import {
  flexRender,
  getCoreRowModel,
  useReactTable,
  getExpandedRowModel,
  type SortingState,
  type VisibilityState,
  type ExpandedState,
  type Row,
} from '@tanstack/react-table'
import { useDebounce, useMediaQuery } from '@/hooks'
import { useTranslation } from 'react-i18next'
import { cn } from '@/lib/utils'
import { useTableUrlState } from '@/hooks/use-table-url-state'
import { Input } from '@/components/ui/input'
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table'
import {
  DataTableToolbar,
  TableSkeleton,
  TableEmpty,
  MobileCardList,
} from '@/components/data-table'
import { DataTablePagination } from '@/components/data-table/pagination'
import { PageFooterPortal } from '@/components/layout'
import { getChannels, searchChannels, getGroups } from '../api'
import {
  DEFAULT_PAGE_SIZE,
  CHANNEL_STATUS,
  CHANNEL_STATUS_OPTIONS,
  CHANNEL_TYPE_OPTIONS,
} from '../constants'
import {
  channelsQueryKeys,
  aggregateChannelsByTag,
  isTagAggregateRow,
} from '../lib'
import type { Channel } from '../types'
import { useChannelsColumns } from './channels-columns'
import { useChannels } from './channels-provider'
import { DataTableBulkActions } from './data-table-bulk-actions'

const route = getRouteApi('/_authenticated/channels/')

function isDisabledChannelRow(channel: Channel) {
  return !isTagAggregateRow(channel) && channel.status !== CHANNEL_STATUS.ENABLED
}

export function ChannelsTable() {
  const { t } = useTranslation()
  const { enableTagMode, idSort } = useChannels()
  const isMobile = useMediaQuery('(max-width: 640px)')

  // Table state
  const [sorting, setSorting] = useState<SortingState>([])
  const [columnVisibility, setColumnVisibility] = useState<VisibilityState>({
    models: false,
    tag: false,
  })
  const [rowSelection, setRowSelection] = useState({})
  const [expanded, setExpanded] = useState<ExpandedState>({})

  // URL state management
  const {
    globalFilter,
    onGlobalFilterChange,
    columnFilters,
    onColumnFiltersChange,
    pagination,
    onPaginationChange,
    ensurePageInRange,
  } = useTableUrlState({
    search: route.useSearch(),
    navigate: route.useNavigate(),
    pagination: { defaultPage: 1, defaultPageSize: DEFAULT_PAGE_SIZE },
    globalFilter: { enabled: true, key: 'filter' },
    columnFilters: [
      { columnId: 'status', searchKey: 'status', type: 'array' },
      { columnId: 'type', searchKey: 'type', type: 'array' },
      { columnId: 'group', searchKey: 'group', type: 'array' },
      { columnId: 'model', searchKey: 'model', type: 'string' },
    ],
  })

  // Extract filters from column filters
  const statusFilter =
    (columnFilters.find((f) => f.id === 'status')?.value as string[]) || []
  const typeFilter =
    (columnFilters.find((f) => f.id === 'type')?.value as string[]) || []
  const groupFilter =
    (columnFilters.find((f) => f.id === 'group')?.value as string[]) || []
  const modelFilterFromUrl =
    (columnFilters.find((f) => f.id === 'model')?.value as string) || ''

  // Local state for immediate input feedback
  const [modelFilterInput, setModelFilterInput] = useState(modelFilterFromUrl)
  const debouncedModelFilter = useDebounce(modelFilterInput, 500)

  // Sync local input with URL when URL changes (e.g., from back/forward navigation)
  useEffect(() => {
    setModelFilterInput(modelFilterFromUrl)
  }, [modelFilterFromUrl])

  // Update URL when debounced value changes
  useEffect(() => {
    if (debouncedModelFilter !== modelFilterFromUrl) {
      onColumnFiltersChange((prev) => {
        const filtered = prev.filter((f) => f.id !== 'model')
        return debouncedModelFilter
          ? [...filtered, { id: 'model', value: debouncedModelFilter }]
          : filtered
      })
    }
  }, [debouncedModelFilter, modelFilterFromUrl, onColumnFiltersChange])

  const modelFilter = modelFilterFromUrl

  // Determine whether to use search or regular list API
  const shouldSearch = Boolean(globalFilter?.trim() || modelFilter.trim())

  // Fetch groups for filter
  const { data: groupsData } = useQuery({
    queryKey: ['groups'],
    queryFn: getGroups,
  })

  const groupOptions = useMemo(
    () =>
      (groupsData?.data || []).map((g) => ({
        label: g,
        value: g,
      })),
    [groupsData]
  )

  // Fetch channels data
  // eslint-disable-next-line @tanstack/query/exhaustive-deps
  const { data, isLoading, isFetching } = useQuery({
    queryKey: channelsQueryKeys.list({
      keyword: globalFilter,
      model: modelFilter,
      group:
        groupFilter.length > 0 && !groupFilter.includes('all')
          ? groupFilter[0]
          : undefined,
      status:
        statusFilter.length > 0 && !statusFilter.includes('all')
          ? statusFilter[0]
          : undefined,
      type:
        typeFilter.length > 0 && !typeFilter.includes('all')
          ? Number(typeFilter[0])
          : undefined,
      tag_mode: enableTagMode,
      id_sort: idSort,
      p: pagination.pageIndex + 1,
      page_size: pagination.pageSize,
    }),
    queryFn: async () => {
      if (shouldSearch) {
        return searchChannels({
          keyword: globalFilter,
          model: modelFilter,
          group:
            groupFilter.length > 0 && !groupFilter.includes('all')
              ? groupFilter[0]
              : undefined,
          status:
            statusFilter.length > 0 && !statusFilter.includes('all')
              ? statusFilter[0]
              : undefined,
          type:
            typeFilter.length > 0 && !typeFilter.includes('all')
              ? Number(typeFilter[0])
              : undefined,
          tag_mode: enableTagMode,
          id_sort: idSort,
          p: pagination.pageIndex + 1,
          page_size: pagination.pageSize,
        })
      } else {
        return getChannels({
          group:
            groupFilter.length > 0 && !groupFilter.includes('all')
              ? groupFilter[0]
              : undefined,
          status:
            statusFilter.length > 0 && !statusFilter.includes('all')
              ? statusFilter[0]
              : undefined,
          type:
            typeFilter.length > 0 && !typeFilter.includes('all')
              ? Number(typeFilter[0])
              : undefined,
          tag_mode: enableTagMode,
          id_sort: idSort,
          p: pagination.pageIndex + 1,
          page_size: pagination.pageSize,
        })
      }
    },
    placeholderData: (previousData) => previousData,
  })

  // Apply tag aggregation if tag mode is enabled
  const channels = useMemo(() => {
    const rawChannels = data?.data?.items || []

    if (enableTagMode && rawChannels.length > 0) {
      return aggregateChannelsByTag(rawChannels)
    }

    return rawChannels
  }, [data, enableTagMode])

  const totalCount = data?.data?.total || 0
  const typeCounts = data?.data?.type_counts

  // Columns configuration
  const columns = useChannelsColumns()

  // React Table instance
  const table = useReactTable({
    data: channels,
    columns,
    pageCount: Math.ceil(totalCount / pagination.pageSize),
    state: {
      sorting,
      columnFilters,
      columnVisibility,
      rowSelection,
      pagination,
      expanded,
      globalFilter,
    },
    enableRowSelection: (row: Row<Channel>) => !isTagAggregateRow(row.original),
    onRowSelectionChange: setRowSelection,
    onSortingChange: setSorting,
    onColumnFiltersChange,
    onColumnVisibilityChange: setColumnVisibility,
    onPaginationChange,
    onExpandedChange: setExpanded,
    onGlobalFilterChange,
    getCoreRowModel: getCoreRowModel(),
    getExpandedRowModel: getExpandedRowModel(),
    getSubRows: (row: Channel & { children?: Channel[] }) => row.children,
    manualPagination: true,
    manualSorting: true,
    manualFiltering: true,
  })

  // Ensure page is in range when total count changes
  const pageCount = table.getPageCount()
  useEffect(() => {
    ensurePageInRange(pageCount)
  }, [pageCount, ensurePageInRange])

  // Prepare filter options (option.label are i18n keys; faceted-filter uses t(option.label))
  const typeFilterOptions = [
    {
      label: `${t('All Types')}${typeCounts?.all ? ` (${typeCounts.all})` : ''}`,
      value: 'all',
    },
    ...CHANNEL_TYPE_OPTIONS.map((option) => ({
      label: `${t(option.label)}${typeCounts?.[option.value] ? ` (${typeCounts[option.value]})` : ''}`,
      value: String(option.value),
    })),
  ]

  const groupFilterOptions = [
    { label: t('All Groups'), value: 'all' },
    ...groupOptions,
  ]

  return (
    <>
      <div className='space-y-4'>
        <DataTableToolbar
          table={table}
          searchPlaceholder={t('Filter by name, ID, or key...')}
          additionalSearch={
            <Input
              placeholder={t('Filter by model...')}
              value={modelFilterInput}
              onChange={(e) => setModelFilterInput(e.target.value)}
              className='h-8 w-full sm:w-[150px] lg:w-[200px]'
            />
          }
          filters={[
            {
              columnId: 'status',
              title: t('Status'),
              options: [...CHANNEL_STATUS_OPTIONS],
              singleSelect: true,
            },
            {
              columnId: 'type',
              title: t('Type'),
              options: typeFilterOptions,
              singleSelect: true,
            },
            {
              columnId: 'group',
              title: t('Group'),
              options: groupFilterOptions,
              singleSelect: true,
            },
          ]}
        />

        {isMobile ? (
          <MobileCardList
            table={table}
            isLoading={isLoading}
            emptyTitle='No Channels Found'
            emptyDescription='No channels available. Create your first channel to get started.'
            getRowClassName={(row) =>
              isDisabledChannelRow(row.original)
                ? 'border-l-4 border-l-muted-foreground/35 bg-muted/85 dark:border-l-zinc-300/70 dark:bg-zinc-700/55'
                : undefined
            }
          />
        ) : (
          <>
            <div
              className={cn(
                'overflow-hidden rounded-md border transition-opacity duration-150',
                isFetching && !isLoading && 'pointer-events-none opacity-50'
              )}
            >
              <Table>
                <TableHeader>
                  {table.getHeaderGroups().map((headerGroup) => (
                    <TableRow key={headerGroup.id}>
                      {headerGroup.headers.map((header) => (
                        <TableHead
                          key={header.id}
                          style={{ width: header.getSize() }}
                        >
                          {header.isPlaceholder
                            ? null
                            : flexRender(
                                header.column.columnDef.header,
                                header.getContext()
                              )}
                        </TableHead>
                      ))}
                    </TableRow>
                  ))}
                </TableHeader>
                <TableBody>
                  {isLoading ? (
                    <TableSkeleton table={table} keyPrefix='channel-skeleton' />
                  ) : table.getRowModel().rows.length === 0 ? (
                    <TableEmpty
                      colSpan={columns.length}
                      title={t('No Channels Found')}
                      description={t(
                        'No channels available. Create your first channel to get started.'
                      )}
                    />
                  ) : (
                    table.getRowModel().rows.map((row) => (
                      <TableRow
                        key={row.id}
                        data-state={row.getIsSelected() && 'selected'}
                        className={cn(
                          isDisabledChannelRow(row.original) &&
                            'bg-muted/85 hover:bg-muted dark:bg-zinc-700/55 dark:hover:bg-zinc-700/70 [&>td:first-child]:border-l-4 [&>td:first-child]:border-l-muted-foreground/35 [&>td:first-child]:pl-1 dark:[&>td:first-child]:border-l-zinc-300/70'
                        )}
                      >
                        {row.getVisibleCells().map((cell) => (
                          <TableCell key={cell.id}>
                            {flexRender(
                              cell.column.columnDef.cell,
                              cell.getContext()
                            )}
                          </TableCell>
                        ))}
                      </TableRow>
                    ))
                  )}
                </TableBody>
              </Table>
            </div>

            <DataTableBulkActions table={table} />
          </>
        )}
      </div>
      <PageFooterPortal>
        <DataTablePagination table={table} />
      </PageFooterPortal>
    </>
  )
}
