import React, { useEffect } from 'react'
import { useStyles } from './styled';

import Table from '@material-ui/core/Table';
import TableBody from '@material-ui/core/TableBody';
import TableCell from '@material-ui/core/TableCell';
import TableContainer from '@material-ui/core/TableContainer';
import TableHead from '@material-ui/core/TableHead';
import TablePagination from '@material-ui/core/TablePagination';
import TableRow from '@material-ui/core/TableRow';
import TableSortLabel from '@material-ui/core/TableSortLabel';
import Toolbar from '@material-ui/core/Toolbar';
import Paper from '@material-ui/core/Paper';
import Checkbox from '@material-ui/core/Checkbox';
import IconButton from '@material-ui/core/IconButton';
import Tooltip from '@material-ui/core/Tooltip';
import StarRateRoundedIcon from '@material-ui/icons/StarRateRounded';
import MoreHorizIcon from '@material-ui/icons/MoreHoriz';
import { CSSProperties } from 'react';
import { useSelector } from 'react-redux';
import { activeInstance } from '../../../redux/clientSlice';
import { useMutation, useQuery, useQueryClient } from 'react-query';
import { ErrorInfo, MapInfo } from '../../../client';
import Client from '../../../client';
import ActionChooser, { ActionType } from '../action-chooser';
import ActionDispatcher from '../action-dispatcher';
import { Button, InputBase, Link } from '@material-ui/core';
import SearchIcon from '@material-ui/icons/Search';
import moment from 'moment'
import { Filter, LabelFilter } from '..';
import { FormattedMessage, useIntl } from 'react-intl';
import { DeleteOutlined, LabelTwoTone } from '@material-ui/icons';
import Alert from '@material-ui/lab/Alert';


function descendingComparator<T>(a: T, b: T, orderBy: keyof T) {
  if (b[orderBy] < a[orderBy]) {
    return -1;
  }
  if (b[orderBy] > a[orderBy]) {
    return 1;
  }
  return 0;
}

type Order = 'asc' | 'desc';

function getComparator<Key extends keyof any>(
  order: Order,
  orderBy: Key,
): (a: { [key in Key]: number | string | boolean | number[] | undefined }, b: { [key in Key]: number | string | number[] | boolean }) => number {
  return order === 'desc'
    ? (a, b) => descendingComparator(a, b, orderBy)
    : (a, b) => -descendingComparator(a, b, orderBy);
}

function stableSort<T>(array: T[], comparator: (a: T, b: T) => number) {
  const stabilizedThis = array.map((el, index) => [el, index] as [T, number]);
  stabilizedThis.sort((a, b) => {
    const order = comparator(a[0], b[0]);
    if (order !== 0) return order;
    return a[1] - b[1];
  });
  return stabilizedThis.map((el) => el[0]);
}

interface HeadCell {
  id: keyof MapInfo;
  label?: string;
  numeric: boolean;
  style?: CSSProperties;
}


interface EnhancedTableProps {
  classes: ReturnType<typeof useStyles>;
  numSelected: number;
  onRequestSort: (event: React.MouseEvent<unknown>, property: keyof MapInfo) => void;
  onSelectAllClick: (event: React.ChangeEvent<HTMLInputElement>) => void;
  order: Order;
  orderBy: string;
  rowCount: number;
}

function EnhancedTableHead(props: EnhancedTableProps) {
  const intl = useIntl();

  const { classes, onSelectAllClick, order, orderBy, numSelected, rowCount, onRequestSort } = props;

  const createSortHandler = (property: keyof MapInfo) => (event: React.MouseEvent<unknown>) => {
    onRequestSort(event, property);
  };

  const headCells: HeadCell[] = [
    { id: 'title', numeric: false, label: intl.formatMessage({ id: 'map.name', defaultMessage: 'Name' }) },
    { id: 'labels', numeric: false },
    { id: 'createdBy', numeric: false, label: intl.formatMessage({ id: 'map.creator', defaultMessage: 'Creator' }), style: { width: '70px', whiteSpace: 'nowrap' } },
    { id: 'lastModificationTime', numeric: true, label: intl.formatMessage({ id: 'map.last-update', defaultMessage: 'Last Update' }), style: { width: '70px', whiteSpace: 'nowrap' } }
  ];

  return (
    <TableHead>
      <TableRow>
        <TableCell padding='checkbox' key='select' style={{ width: '20px' }} className={classes.headerCell}>
          <Checkbox
            indeterminate={numSelected > 0 && numSelected < rowCount}
            checked={rowCount > 0 && numSelected === rowCount}
            onChange={onSelectAllClick}
            size='small'
            inputProps={{ 'aria-label': 'select all desserts' }}
          />
        </TableCell>

        <TableCell padding='checkbox' key='starred' className={classes.headerCell}></TableCell>

        {headCells.map((headCell) => {
          return (<TableCell
            key={headCell.id}
            sortDirection={orderBy === headCell.id ? order : false}
            style={headCell.style}
            className={classes.headerCell}
          >
            <TableSortLabel
              active={orderBy === headCell.id}
              direction={orderBy === headCell.id ? order : 'asc'}
              onClick={createSortHandler(headCell.id)}>
              {headCell.label}

              {orderBy === headCell.id && (
                <span className={classes.visuallyHidden}>
                  {order === 'desc' ? 'sorted descending' : 'sorted ascending'}
                </span>
              )}

            </TableSortLabel>
          </TableCell>)
        })}

        <TableCell padding='checkbox' key='action' className={classes.headerCell}></TableCell>

      </TableRow>
    </TableHead>
  );
}

type ActionPanelState = {
  el: HTMLElement | undefined,
  mapId: number
}

interface MapsListProps {
  filter: Filter
}

const mapsFilter = (filter: Filter, search: string): ((mapInfo: MapInfo) => boolean) => {
  return (mapInfo: MapInfo) => {

    // Check for filter condition
    let result = false;
    switch (filter.type) {
      case 'all':
        result = true;
        break;
      case 'starred':
        result = mapInfo.starred;
        break;
      case 'owned':
        result = mapInfo.role == 'owner';
        break;
      case 'shared':
        result = mapInfo.role != 'owner';
        break;
      case 'label':
        result = !mapInfo.labels || mapInfo.labels.includes((filter as LabelFilter).label.id)
        break;
      case 'public':
        result = mapInfo.isPublic;
        break;
      default:
        result = false;
    }

    // Does it match search filter criteria...
    if (search && result) {
      result = mapInfo.title.toLowerCase().indexOf(search.toLowerCase()) != -1;
    }

    return result;
  }
}

export const MapsList = (props: MapsListProps) => {
  const classes = useStyles();
  const [order, setOrder] = React.useState<Order>('asc');
  const [filter, setFilter] = React.useState<Filter>({ type: 'all' });

  const [orderBy, setOrderBy] = React.useState<keyof MapInfo>('lastModificationTime');
  const [selected, setSelected] = React.useState<number[]>([]);
  const [searchCondition, setSearchCondition] = React.useState<string>('');

  const [page, setPage] = React.useState(0);
  const [rowsPerPage, setRowsPerPage] = React.useState(10);
  const client: Client = useSelector(activeInstance);
  const intl = useIntl();

  const queryClient = useQueryClient();


  useEffect(() => {
    setSelected([]);
    setPage(0);
    setFilter(props.filter)
  }, [props.filter.type, (props.filter as LabelFilter).label]);


  const { isLoading, error, data } = useQuery<unknown, ErrorInfo, MapInfo[]>('maps', async () => {
    return await client.fetchAllMaps();
  });
  const mapsInfo: MapInfo[] = data ? data.filter(mapsFilter(filter, searchCondition)) : [];

  const [activeRowAction, setActiveRowAction] = React.useState<ActionPanelState | undefined>(undefined);
  type ActiveDialog = {
    actionType: ActionType;
    mapsId: number[];
  };

  const [activeDialog, setActiveDialog] = React.useState<ActiveDialog | undefined>(undefined);
  const handleRequestSort = (event: React.MouseEvent<unknown>, property: keyof MapInfo) => {
    const isAsc = orderBy === property && order === 'asc';
    setOrder(isAsc ? 'desc' : 'asc');
    setOrderBy(property);
  };

  const handleSelectAllClick = (event: React.ChangeEvent<HTMLInputElement>): void => {
    if (event.target.checked) {
      const newSelecteds = mapsInfo.map((n) => n.id);
      setSelected(newSelecteds);
      return;
    }
    setSelected([]);
  };

  const handleRowClick = (event: React.MouseEvent<unknown>, id: number): void => {
    const selectedIndex = selected.indexOf(id);
    let newSelected: number[] = [];

    if (selectedIndex === -1) {
      newSelected = newSelected.concat(selected, id);
    } else if (selectedIndex === 0) {
      newSelected = newSelected.concat(selected.slice(1));
    } else if (selectedIndex === selected.length - 1) {
      newSelected = newSelected.concat(selected.slice(0, -1));
    } else if (selectedIndex > 0) {
      newSelected = newSelected.concat(
        selected.slice(0, selectedIndex),
        selected.slice(selectedIndex + 1),
      );
    }

    setSelected(newSelected);
  };

  const handleChangePage = (event: unknown, newPage: number) => {
    setPage(newPage);
  };

  const handleChangeRowsPerPage = (event: React.ChangeEvent<HTMLInputElement>) => {
    setRowsPerPage(parseInt(event.target.value, 10));
    setPage(0);
  };

  const handleActionClick = (mapId: number): ((event: any) => void) => {
    return (event: any): void => {
      setActiveRowAction(
        {
          mapId: mapId,
          el: event.currentTarget
        }
      );
      event.stopPropagation();
    };
  };


  const starredMultation = useMutation<void, ErrorInfo, number>((id: number) => {
    const map = mapsInfo.find(m => m.id == id);
    return client.changeStarred(id, !Boolean(map?.starred));
  },
    {
      onSuccess: () => {
        queryClient.invalidateQueries('maps');
      },
      onError: (error) => {
        // setError(error);
      }
    }
  );

  const handleStarred = (event: React.MouseEvent<HTMLButtonElement, MouseEvent>, id: number) => {
    event.stopPropagation();
    starredMultation.mutate(id);
  }

  const handleActionMenuClose = (action: ActionType): void => {
    if (action) {
      const mapId = activeRowAction?.mapId;

      setActiveDialog({
        actionType: action as ActionType,
        mapsId: [mapId] as number[]
      });
    }
    setActiveRowAction(undefined);
  };

  const handleOnSearchChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    setSearchCondition(e.target.value);
  }

  const handleDeleteClick = (event: React.MouseEvent<HTMLButtonElement>) => {
      setActiveDialog({
        actionType: 'delete',
        mapsId: selected
      });
  }

  const isSelected = (id: number) => selected.indexOf(id) !== -1;
  return (
    <div className={classes.root}>
      <ActionChooser anchor={activeRowAction?.el} onClose={handleActionMenuClose} mapId={activeRowAction?.mapId} />

      <Paper className={classes.paper} elevation={0}>
        <Toolbar className={classes.toolbar} variant="dense">

          <div className={classes.toolbarActions}>
            {selected.length > 0 &&
              <Tooltip title="Delete selected">
                <Button
                  color="primary"
                  size="medium"
                  variant="outlined"
                  type="button"
                  disableElevation={true}
                  onClick={handleDeleteClick}
                  startIcon={<DeleteOutlined
                  />}>
                  <FormattedMessage id="action.delete" defaultMessage="Delete" />
                </Button>
              </Tooltip>
            }

            {selected.length > 0 &&
              <Tooltip title="Add label to selected">
                <Button
                  color="primary"
                  size="medium"
                  variant="outlined"
                  type="button"
                  style={{ marginLeft: "10px" }}
                  disableElevation={true}
                  startIcon={<LabelTwoTone />}>
                  <FormattedMessage id="action.label" defaultMessage="Add Label" />
                </Button>
              </Tooltip>
            }
          </div>

          <div className={classes.toolbarListActions}>
            <TablePagination
              style={{ float: 'right', border: "0", paddingBottom: "5px" }}
              count={mapsInfo.length}
              rowsPerPageOptions={[]}
              rowsPerPage={rowsPerPage}
              page={page}
              onChangePage={handleChangePage}
              onChangeRowsPerPage={handleChangeRowsPerPage}
              component="div"
            />
            <div className={classes.search}>
              <div className={classes.searchIcon}>
                <SearchIcon />
              </div>
              <InputBase
                placeholder="Search…"
                classes={{
                  root: classes.searchInputRoot,
                  input: classes.searchInputInput,
                }}
                inputProps={{ 'aria-label': 'search' }}
                onChange={handleOnSearchChange}
              />
            </div>
          </div>

        </Toolbar>

        <TableContainer>
          <Table
            className={classes.table}
            size="small"
            stickyHeader
          >
            <EnhancedTableHead
              classes={classes}
              numSelected={selected.length}
              order={order}
              orderBy={orderBy}
              onSelectAllClick={handleSelectAllClick}
              onRequestSort={handleRequestSort}
              rowCount={mapsInfo.length}
            />

            <TableBody>
              {isLoading ? (
                <TableRow><TableCell colSpan={6}>Loading ...</TableCell></TableRow>) :
                (mapsInfo.length == 0 ?
                  (<TableRow><TableCell colSpan={6} style={{ textAlign: 'center' }}><FormattedMessage id="maps.empty-result" defaultMessage="No matching record found with the current filter criteria." /></TableCell></TableRow>) :
                  stableSort(mapsInfo, getComparator(order, orderBy))
                    .slice(page * rowsPerPage, page * rowsPerPage + rowsPerPage)
                    .map((row: MapInfo) => {
                      const isItemSelected = isSelected(row.id);
                      const labelId = row.id;

                      return (
                        <TableRow
                          hover
                          onClick={(event: any) => handleRowClick(event, row.id)}
                          role="checkbox"
                          aria-checked={isItemSelected}
                          tabIndex={-1}
                          key={row.id}
                          selected={isItemSelected}
                          style={{ border: "0" }}
                        >
                          <TableCell
                            padding="checkbox"
                            className={classes.bodyCell}>
                            <Checkbox
                              checked={isItemSelected}
                              inputProps={{ 'aria-labelledby': String(labelId) }}
                              size="small" />
                          </TableCell>

                          <TableCell
                            padding="checkbox"
                            className={classes.bodyCell}>
                            <Tooltip title="Starred">
                              <IconButton aria-label="Starred" size="small" onClick={(e) => handleStarred(e, row.id)}>
                                <StarRateRoundedIcon color="action" style={{ color: row.starred ? 'yellow' : 'gray' }} />
                              </IconButton>
                            </Tooltip>
                          </TableCell>

                          <TableCell className={classes.bodyCell}>
                            <Tooltip title="Open for edition" placement="bottom-start">
                              <Link href={`/c/maps/${row.id}/edit`} color="textPrimary" underline="always" onClick={(e) => e.stopPropagation()}>
                                {row.title}
                              </Link>
                            </Tooltip>
                          </TableCell>

                          <TableCell className={classes.bodyCell}>
                            {row.labels}
                          </TableCell>

                          <TableCell className={classes.bodyCell}>
                            {row.createdBy}
                          </TableCell>

                          <TableCell className={classes.bodyCell}>
                            <Tooltip title={
                              `Modified by ${row.lastModificationBy} on ${moment(row.lastModificationTime).format("lll")}`
                            } placement="bottom-start">
                              <span>{moment(row.lastModificationTime).fromNow()}</span>
                            </Tooltip>
                          </TableCell>

                          <TableCell className={classes.bodyCell}>
                            <Tooltip title={intl.formatMessage({ id: 'map.more-actions', defaultMessage: 'More Actions' })}>
                              <IconButton aria-label="Others" size="small" onClick={handleActionClick(row.id)}>
                                <MoreHorizIcon color="action" />
                              </IconButton>
                            </Tooltip>
                          </TableCell>
                        </TableRow>
                      );
                    }))}
            </TableBody>
          </Table>
        </TableContainer>

      </Paper>

      <ActionDispatcher action={activeDialog?.actionType} onClose={() => setActiveDialog(undefined)} mapsId={activeDialog ? activeDialog.mapsId : []} />
    </div >
  );
}

const ErrorDialog = (props) => {

  return (<Alert severity="error">This is an error alert — check it out!</Alert>);

}