import {
  Button,
  Container,
  Dialog,
  DialogActions,
  DialogContent,
  DialogTitle,
  IconButton,
  List,
  ListItem,
  ListItemButton,
  ListItemText,
  MenuItem,
  Stack,
  TextField,
  Typography,
} from '@mui/material';
import { Delete, Edit } from '@mui/icons-material';
import { format } from 'date-fns';
import { useMemo, useState } from 'react';
import { Link as RouterLink } from 'react-router-dom';
import { usePickLists, useAreas } from '../hooks/dataHooks';
import { useDatabase } from '../context/DBProvider';
import { PickList } from '../models/PickList';

export const PickListsScreen = () => {
  const lists = usePickLists();
  const areas = useAreas();
  const db = useDatabase();
  const [editingList, setEditingList] = useState<PickList | null>(null);
  const [areaId, setAreaId] = useState('');
  const [notes, setNotes] = useState('');

  const sortedLists = useMemo(() => {
    return [...lists].sort((a, b) => a.created_at - b.created_at);
  }, [lists]);

  const getAreaName = (areaId: string) => areas.find((a) => a.id === areaId)?.name ?? 'Unknown area';

  const openEdit = (list: PickList) => {
    setEditingList(list);
    setAreaId(list.area_id);
    setNotes(list.notes ?? '');
  };

  const closeEdit = () => {
    setEditingList(null);
    setAreaId('');
    setNotes('');
  };

  const saveEdit = async () => {
    if (!editingList || !areaId) return;
    await db.pickLists.update(editingList.id, {
      area_id: areaId,
      notes: notes.trim() || undefined,
    });
    closeEdit();
  };

  const deleteList = async (list: PickList) => {
    const confirmed = window.confirm('Remove this pick list and its items?');
    if (!confirmed) return;
    await db.pickItems.where('pick_list_id').equals(list.id).delete();
    await db.pickLists.delete(list.id);
  };

  return (
    <Container sx={{ py: 4 }}>
      <Typography variant="h5" gutterBottom>
        Pick Lists
      </Typography>
      <Button component={RouterLink} to="/start" variant="contained" sx={{ mb: 2 }}>
        Add Pick List
      </Button>
      <List>
        {sortedLists.map((list) => (
          <ListItem key={list.id} divider secondaryAction={
            <Stack direction="row" spacing={1}>
              <IconButton
                edge="end"
                aria-label="Edit"
                onClick={(event) => {
                  event.stopPropagation();
                  event.preventDefault();
                  openEdit(list);
                }}
              >
                <Edit />
              </IconButton>
              <IconButton
                edge="end"
                aria-label="Delete"
                onClick={(event) => {
                  event.stopPropagation();
                  event.preventDefault();
                  deleteList(list);
                }}
              >
                <Delete />
              </IconButton>
            </Stack>
          }>
            <ListItemButton component={RouterLink} to={`/pick-lists/${list.id}`}>
              <ListItemText
                primary={getAreaName(list.area_id)}
                secondary={
                  <Stack spacing={0.5}>
                    {list.notes ? <span>{list.notes}</span> : null}
                    <Typography variant="caption" color="text.secondary">
                      Created {format(list.created_at, 'PPpp')}
                    </Typography>
                  </Stack>
                }
              />
            </ListItemButton>
          </ListItem>
        ))}
      </List>

      <Dialog open={Boolean(editingList)} onClose={closeEdit} fullWidth>
        <DialogTitle>Edit Pick List</DialogTitle>
        <DialogContent sx={{ pt: 1 }}>
          <Stack spacing={2} mt={1}>
            <TextField
              select
              fullWidth
              label="Area"
              value={areaId}
              onChange={(event) => setAreaId(event.target.value)}
            >
              {areas.map((area) => (
                <MenuItem key={area.id} value={area.id}>
                  {area.name}
                </MenuItem>
              ))}
            </TextField>
            <TextField
              label="Notes"
              value={notes}
              onChange={(event) => setNotes(event.target.value)}
              multiline
              minRows={2}
            />
          </Stack>
        </DialogContent>
        <DialogActions>
          <Button onClick={closeEdit}>Cancel</Button>
          <Button variant="contained" onClick={saveEdit} disabled={!areaId}>
            Save Changes
          </Button>
        </DialogActions>
      </Dialog>
    </Container>
  );
};