import { useMemo, useState, type ReactElement } from 'react';
import {
  flexRender,
  getCoreRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  useReactTable,
  type SortingState,
} from '@tanstack/react-table';
import { Pagination } from '@/components/common/index.js';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table.js';
import {
  LedgerRecordsTableFieldsFragmentDoc,
  type LedgerRecordsTableFieldsFragment,
} from '@/gql/graphql.js';
import { getFragmentData, type FragmentType } from '@/gql/index.js';
import { EMPTY_UUID } from '@/helpers/consts.js';
import { columns } from './columns.js';

// eslint-disable-next-line @typescript-eslint/no-unused-expressions -- used by codegen
/* GraphQL */ `
  fragment LedgerRecordsTableFields on LedgerRecord {
    id
    creditAccount1 {
      __typename
      id
      name
    }
    creditAccount2 {
      __typename
      id
      name
    }
    debitAccount1 {
      __typename
      id
      name
    }
    debitAccount2 {
      __typename
      id
      name
    }
    creditAmount1 {
      formatted
      currency
    }
    creditAmount2 {
      formatted
      currency
    }
    debitAmount1 {
      formatted
      currency
    }
    debitAmount2 {
      formatted
      currency
    }
    localCurrencyCreditAmount1 {
      formatted
      raw
    }
    localCurrencyCreditAmount2 {
      formatted
      raw
    }
    localCurrencyDebitAmount1 {
      formatted
      raw
    }
    localCurrencyDebitAmount2 {
      formatted
      raw
    }
    invoiceDate
    valueDate
    description
    reference
  }
`;

function getRowColorByStatus(status?: 'New' | 'Diff' | 'Deleted'): string {
  let rowStyle = '';
  switch (status) {
    case 'New':
      rowStyle = 'bg-green-100/30';
      break;
    case 'Deleted':
      rowStyle = 'bg-red-100/30';
      break;
    case 'Diff':
      rowStyle = 'bg-yellow-100/30';
      break;
  }
  return rowStyle;
}

export type LedgerRecordRow = LedgerRecordsTableFieldsFragment & {
  matchingStatus?: 'New' | 'Diff' | 'Deleted';
  diff?: LedgerRecordsTableFieldsFragment;
};

type Props = {
  ledgerRecordsData: FragmentType<typeof LedgerRecordsTableFieldsFragmentDoc>[];
  ledgerDiffData?: FragmentType<typeof LedgerRecordsTableFieldsFragmentDoc>[];
  matches?: string[];
};

export const LedgerTable = ({
  ledgerRecordsData,
  ledgerDiffData,
  matches,
}: Props): ReactElement => {
  const [sorting, setSorting] = useState<SortingState>([]);

  const data = useMemo(() => {
    const records = ledgerRecordsData.map(recordData =>
      getFragmentData(LedgerRecordsTableFieldsFragmentDoc, recordData),
    );
    const differences = ledgerDiffData?.map(recordData =>
      getFragmentData(LedgerRecordsTableFieldsFragmentDoc, recordData),
    );

    const currentRecords: LedgerRecordRow[] = records.map(record => {
      const diff = differences?.find(diffRecord => diffRecord.id === record.id);
      return {
        ...record,
        matchingStatus:
          !matches || matches?.includes(record.id) ? undefined : diff ? 'Diff' : 'Deleted',
        diff,
      };
    });
    const newRecords: LedgerRecordRow[] =
      differences
        ?.filter(record => record.id === EMPTY_UUID)
        .map(record => ({
          ...record,
          matchingStatus: 'New',
        })) ?? [];
    currentRecords.push(...newRecords);
    return currentRecords;
  }, [ledgerRecordsData, ledgerDiffData, matches]);

  const table = useReactTable({
    data,
    columns,
    getCoreRowModel: getCoreRowModel(),
    onSortingChange: setSorting,
    getSortedRowModel: getSortedRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    state: {
      sorting,
    },
    initialState: {
      pagination: {
        pageIndex: 0,
        pageSize: 100,
      },
      sorting: [
        {
          id: 'invoiceDate',
          desc: true,
        },
      ],
    },
  });

  return (
    <>
      <Table>
        <TableHeader>
          {table.getHeaderGroups().map(headerGroup => (
            <TableRow key={headerGroup.id}>
              {headerGroup.headers.map(header => (
                <TableHead className="text-center" key={header.id} colSpan={header.colSpan}>
                  {header.isPlaceholder
                    ? null
                    : flexRender(header.column.columnDef.header, header.getContext())}
                </TableHead>
              ))}
            </TableRow>
          ))}
        </TableHeader>
        <TableBody>
          {table.getRowModel().rows?.length ? (
            table.getRowModel().rows.map(row => (
              <TableRow
                key={row.id}
                data-state={row.getIsSelected() && 'selected'}
                className={getRowColorByStatus(row.original.matchingStatus)}
              >
                {row.getVisibleCells().map(cell => (
                  <TableCell key={cell.id}>
                    {flexRender(cell.column.columnDef.cell, cell.getContext())}
                  </TableCell>
                ))}
              </TableRow>
            ))
          ) : (
            <TableRow>
              <TableCell colSpan={columns.length} className="h-24 text-center">
                No results.
              </TableCell>
            </TableRow>
          )}
        </TableBody>
      </Table>
      <div className="flex items-center justify-end space-x-2 py-4">
        <Pagination
          currentPageIndex={table.getState().pagination.pageIndex}
          totalPages={table.getPageCount()}
          onChange={page => table.setPageIndex(page)}
        />
      </div>
    </>
  );
};