'use client';

import isEqual from 'lodash/isEqual';
import { useState, useCallback } from 'react';
// @mui
import { alpha } from '@mui/material/styles';
import Tab from '@mui/material/Tab';
import Tabs from '@mui/material/Tabs';
import Card from '@mui/material/Card';
import Table from '@mui/material/Table';
import Button from '@mui/material/Button';
import Container from '@mui/material/Container';
import TableBody from '@mui/material/TableBody';
import TableContainer from '@mui/material/TableContainer';
// routes
import { paths } from 'src/routes/paths';
import { RouterLink } from 'src/routes/components';
// hooks
import { useBoolean } from 'src/hooks/use-boolean';
// components
import Label from 'src/components/label';
import Iconify from 'src/components/iconify';
import Scrollbar from 'src/components/scrollbar';
import { useSettingsContext } from 'src/components/settings';
import CustomBreadcrumbs from 'src/components/custom-breadcrumbs';
import {
  useTable,
  getComparator,
  emptyRows,
  TableNoData,
  TableEmptyRows,
  TableHeadCustom,
  TablePaginationCustom,
} from 'src/components/table';
// types
import { Employee, EmployeeTableFilters, EmployeeTableFilterValue } from 'src/schemas';
//
import { useGetEmployees } from 'src/api/employee';
import EmployeeTableRow from '../employee-table-row';
import EmployeeTableFiltersResult from '../employee-table-filters-result';

const STATUS_OPTIONS = [
  { value: 'all', label: 'All' },
  { value: 'active', label: 'Active' },
  { value: 'inactive', label: 'Inactive' },
];

const TABLE_HEAD = [
  { id: 'name', label: 'Name' },
  { id: 'email', label: 'Email' },
  { id: 'project', label: 'Project' },
  { id: 'status', label: 'Status', width: 100 },
  { id: '', width: 88 },
];

const defaultFilters: EmployeeTableFilters = {
  name: '',
  status: 'all',
};

export default function EmployeeListView() {
  const table = useTable({ defaultDense: true });
  const settings = useSettingsContext();
  const { employees } = useGetEmployees();
  const [filters, setFilters] = useState(defaultFilters);

  const dataFiltered = applyFilter({
    inputData: employees,
    comparator: getComparator(table.order, table.orderBy),
    filters,
  });

  const dataInPage = dataFiltered.slice(
    table.page * table.rowsPerPage,
    table.page * table.rowsPerPage + table.rowsPerPage
  );

  const denseHeight = table.dense ? 52 : 72;

  const canReset = !isEqual(defaultFilters, filters);

  const notFound = (!dataFiltered.length && canReset) || !dataFiltered.length;

  const handleFilters = useCallback(
    (name: string, value: EmployeeTableFilterValue) => {
      table.onResetPage();
      setFilters((prevState: EmployeeTableFilters) => ({
        ...prevState,
        [name]: value,
      }));
    },
    [table]
  );

  const handleFilterStatus = useCallback(
    (event: React.SyntheticEvent, newValue: string) => {
      handleFilters('status', newValue);
    },
    [handleFilters]
  );

  const handleResetFilters = useCallback(() => {
    setFilters(defaultFilters);
  }, []);

  return (
    <>
      <Container maxWidth={settings.themeStretch ? false : 'lg'}>
        <CustomBreadcrumbs
          heading="List"
          links={[
            { name: 'Dashboard', href: paths.dashboard.root },
            { name: 'Employee', href: paths.dashboard.employee.list },
            { name: 'List' },
          ]}
          action={
            <Button
              component={RouterLink}
              href={paths.dashboard.employee.new}
              variant="contained"
              startIcon={<Iconify icon="mingcute:add-line" />}
            >
              New Employee
            </Button>
          }
          sx={{
            mb: { xs: 3, md: 5 },
          }}
        />

        <Card>
          <Tabs
            value={filters.status}
            onChange={handleFilterStatus}
            sx={{
              px: 2.5,
              boxShadow: (theme) => `inset 0 -2px 0 0 ${alpha(theme.palette.grey[500], 0.08)}`,
            }}
          >
            {STATUS_OPTIONS.map((tab) => (
              <Tab
                key={tab.value}
                iconPosition="end"
                value={tab.value}
                label={tab.label}
                icon={
                  <Label
                    variant={
                      ((tab.value === 'all' || tab.value === filters.status) && 'filled') || 'soft'
                    }
                    color={
                      (tab.value === 'active' && 'success') ||
                      (tab.value === 'inactive' && 'warning') ||
                      'default'
                    }
                  >
                    {tab.value === 'all' && employees.length}
                    {tab.value === 'active' &&
                      employees.filter((employee) => employee.status === 'active').length}
                    {tab.value === 'inactive' &&
                      employees.filter((employee) => employee.status === 'inactive').length}
                  </Label>
                }
              />
            ))}
          </Tabs>

          {canReset && (
            <EmployeeTableFiltersResult
              filters={filters}
              onFilters={handleFilters}
              onResetFilters={handleResetFilters}
              results={dataFiltered.length}
              sx={{ p: 2.5, pt: 0 }}
            />
          )}

          <TableContainer sx={{ position: 'relative', overflow: 'unset' }}>
            <Scrollbar>
              <Table size={table.dense ? 'small' : 'medium'} sx={{ minWidth: 960 }}>
                <TableHeadCustom
                  order={table.order}
                  orderBy={table.orderBy}
                  headLabel={TABLE_HEAD}
                  rowCount={employees.length}
                  numSelected={table.selected.length}
                  onSort={table.onSort}
                />

                <TableBody>
                  {dataFiltered
                    .slice(
                      table.page * table.rowsPerPage,
                      table.page * table.rowsPerPage + table.rowsPerPage
                    )
                    .map((row) => (
                      <EmployeeTableRow
                        key={row.id}
                        row={row}
                        selected={table.selected.includes(row.id!)}
                        onEditRow={() => {}}
                      />
                    ))}

                  <TableEmptyRows
                    height={denseHeight}
                    emptyRows={emptyRows(table.page, table.rowsPerPage, employees.length)}
                  />

                  <TableNoData notFound={notFound} />
                </TableBody>
              </Table>
            </Scrollbar>
          </TableContainer>

          <TablePaginationCustom
            count={dataFiltered.length}
            page={table.page}
            rowsPerPage={table.rowsPerPage}
            onPageChange={table.onChangePage}
            onRowsPerPageChange={table.onChangeRowsPerPage}
            dense={table.dense}
            onChangeDense={table.onChangeDense}
          />
        </Card>
      </Container>
    </>
  );
}

// ----------------------------------------------------------------------

function applyFilter({
  inputData,
  comparator,
  filters,
}: {
  inputData: Employee[];
  comparator: (a: any, b: any) => number;
  filters: EmployeeTableFilters;
}) {
  const { name, status } = filters;

  const stabilizedThis = inputData.map((el, index) => [el, index] as const);

  stabilizedThis.sort((a, b) => {
    const order = comparator(a[0], b[0]);
    if (order !== 0) return order;
    return a[1] - b[1];
  });

  inputData = stabilizedThis.map((el) => el[0]);

  if (name) {
    inputData = inputData.filter(
      (employee) => employee.name.toLowerCase().indexOf(name.toLowerCase()) !== -1
    );
  }

  if (status !== 'all') {
    inputData = inputData.filter((employee) => employee.status === status);
  }

  return inputData;
}