import { useMemo, useState } from "react";
import { useNavigate } from "react-router";
import DeleteOutlineIcon from "@mui/icons-material/DeleteOutlined";
import EditOutlinedIcon from "@mui/icons-material/EditOutlined";
import {
  Alert,
  Box,
  Button,
  CircularProgress,
  Dialog,
  DialogActions,
  DialogContent,
  DialogContentText,
  DialogTitle,
  IconButton,
  Paper,
  Stack,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TablePagination,
  TableRow,
  TextField,
  Tooltip,
  Typography,
} from "@mui/material";
import type { ContactListItem } from "@/domain/contacts/types/contact";
import { useContactsList } from "@/domain/contacts/use-cases/use-contacts-list";
import { useDeleteContact } from "@/domain/contacts/use-cases/use-delete-contact";
import { useDebounce } from "@/hooks/use-debounce";

export default function ContactsListPage() {
  const navigate = useNavigate();
  const [search, setSearch] = useState("");
  const [page, setPage] = useState(0);
  const [pageSize, setPageSize] = useState(12);
  const [deleteTarget, setDeleteTarget] = useState<ContactListItem | null>(null);

  const debouncedSearch = useDebounce(search, 300);
  const deleteContact = useDeleteContact();

  const listParams = useMemo(
    () => ({ search: debouncedSearch, page: page + 1, pageSize }),
    [debouncedSearch, page, pageSize],
  );

  const { data, isLoading, isFetching, error } = useContactsList(listParams);
  const rows = data?.items ?? [];
  const totalCount = data?.totalCount ?? 0;

  return (
    <Box className="flex flex-col gap-4 p-4">
      <Stack
        direction={{ xs: "column", md: "row" }}
        spacing={2}
        sx={{
          alignItems: { xs: "stretch", md: "center" },
          justifyContent: "space-between",
        }}
      >
        <Stack
          direction="row"
          spacing={2}
          sx={{
            alignItems: "baseline",
          }}
        >
          <Typography variant="h5" component="h1">
            Contacts
          </Typography>
          <Typography
            variant="body2"
            sx={{
              color: "text.secondary",
            }}
          >
            {totalCount} total
          </Typography>
          {isFetching && !isLoading && <CircularProgress size={16} />}
        </Stack>

        <Stack
          direction={{ xs: "column", sm: "row" }}
          spacing={2}
          sx={{
            alignItems: "center",
          }}
        >
          <TextField
            size="small"
            value={search}
            onChange={(e) => {
              setSearch(e.target.value);
              setPage(0);
            }}
            placeholder="Search contacts..."
            className="min-w-sidebar"
          />
          <Button variant="contained" onClick={() => navigate("/contacts/new")}>
            + New Contact
          </Button>
        </Stack>
      </Stack>
      {Boolean(error) && (
        <Alert severity="error">
          {error instanceof Error ? error.message : "Failed to load contacts"}
        </Alert>
      )}
      <TableContainer component={Paper} variant="outlined">
        <Table size="small">
          <TableHead>
            <TableRow>
              <TableCell className="font-semibold">Name</TableCell>
              <TableCell className="font-semibold">Account</TableCell>
              <TableCell className="font-semibold">Title</TableCell>
              <TableCell className="font-semibold">Email</TableCell>
              <TableCell className="font-semibold">Phone</TableCell>
              <TableCell className="font-semibold">Owner</TableCell>
              <TableCell align="right" className="font-semibold">
                Actions
              </TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {isLoading ? (
              <TableRow>
                <TableCell colSpan={7} align="center" className="py-10">
                  <CircularProgress size={28} />
                </TableCell>
              </TableRow>
            ) : rows.length === 0 ? (
              <TableRow>
                <TableCell colSpan={7} align="center" className="py-10">
                  <Typography
                    sx={{
                      color: "text.secondary",
                    }}
                  >
                    No contacts found
                  </Typography>
                </TableCell>
              </TableRow>
            ) : (
              rows.map((row) => (
                <TableRow key={String(row.id)} hover>
                  <TableCell>
                    <Button
                      variant="text"
                      size="small"
                      className="font-semibold"
                      onClick={() => navigate(`/contacts/edit/${row.id}`)}
                    >
                      {row.name || "—"}
                    </Button>
                  </TableCell>
                  <TableCell>{row.account || "—"}</TableCell>
                  <TableCell>{row.title || "—"}</TableCell>
                  <TableCell>{row.email || "—"}</TableCell>
                  <TableCell>{row.phoneNumber || "—"}</TableCell>
                  <TableCell>{row.owner || "—"}</TableCell>
                  <TableCell align="right">
                    <Tooltip title="Edit">
                      <IconButton size="small" onClick={() => navigate(`/contacts/edit/${row.id}`)}>
                        <EditOutlinedIcon fontSize="small" />
                      </IconButton>
                    </Tooltip>
                    <Tooltip title="Delete">
                      <IconButton size="small" onClick={() => setDeleteTarget(row)}>
                        <DeleteOutlineIcon fontSize="small" />
                      </IconButton>
                    </Tooltip>
                  </TableCell>
                </TableRow>
              ))
            )}
          </TableBody>
        </Table>
      </TableContainer>
      <TablePagination
        component="div"
        count={totalCount}
        page={page}
        onPageChange={(_e, nextPage) => setPage(nextPage)}
        rowsPerPage={pageSize}
        onRowsPerPageChange={(e) => {
          setPageSize(Number(e.target.value));
          setPage(0);
        }}
        rowsPerPageOptions={[12, 24, 48]}
      />
      <Dialog open={Boolean(deleteTarget)} onClose={() => setDeleteTarget(null)}>
        <DialogTitle>Delete Contact</DialogTitle>
        <DialogContent>
          <DialogContentText>
            Are you sure you want to delete &quot;{deleteTarget?.name}&quot;?
          </DialogContentText>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setDeleteTarget(null)} disabled={deleteContact.isPending}>
            Cancel
          </Button>
          <Button
            color="error"
            variant="contained"
            disabled={deleteContact.isPending}
            onClick={() => {
              if (!deleteTarget) return;
              deleteContact.mutate(deleteTarget.id, {
                onSuccess: () => setDeleteTarget(null),
              });
            }}
          >
            Delete
          </Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
}