import { useMemo, useState } from "react";
import { useNavigate } from "react-router";
import EditOutlinedIcon from "@mui/icons-material/EditOutlined";
import VisibilityOutlinedIcon from "@mui/icons-material/VisibilityOutlined";
import { WorkOrderStatusBadge } from "@/components/domain/status-badge";
import {
  Alert,
  Box,
  Button,
  Chip,
  CircularProgress,
  FormControl,
  IconButton,
  InputLabel,
  MenuItem,
  Paper,
  Select,
  Stack,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TablePagination,
  TableRow,
  TextField,
  Tooltip,
  Typography,
} from "@mui/material";
import { useDebounce } from "@/hooks/use-debounce";
import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order";
import {
  useWorkOrderUsers,
  useWorkOrdersList,
} from "@/domain/work-orders/use-cases/use-work-orders-list";

const STATUS_OPTIONS = ["Open", "In Progress", "On Hold", "Done", "Cancelled"] as const;

function formatDateTime(value: string): string {
  if (!value) {
    return "—";
  }

  const normalized = value.endsWith("Z") ? value : `${value}Z`;
  const date = new Date(normalized);

  if (Number.isNaN(date.getTime())) {
    return value;
  }

  const datePart = date.toLocaleDateString("en-CA");
  const timePart = date.toLocaleTimeString(undefined, {
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  });
  const tz = date.toLocaleTimeString(undefined, { timeZoneName: "short" }).split(" ").pop();

  return `${datePart} ${timePart} ${tz ?? ""}`.trim();
}

export default function WorkOrdersListPage() {
  const navigate = useNavigate();
  const [search, setSearch] = useState("");
  const [statusFilter, setStatusFilter] = useState("");
  const [assigneeFilter, setAssigneeFilter] = useState("");
  const [page, setPage] = useState(0);
  const [pageSize, setPageSize] = useState(12);
  const [sortBy, setSortBy] = useState("");
  const [sortDir, setSortDir] = useState<"asc" | "desc" | "">("");

  const debouncedSearch = useDebounce(search, 300);

  const listParams = useMemo(
    () => ({
      search: debouncedSearch,
      page: page + 1,
      pageSize,
      sortBy,
      sortDir,
      status: statusFilter,
      assignee: assigneeFilter,
    }),
    [debouncedSearch, page, pageSize, sortBy, sortDir, statusFilter, assigneeFilter],
  );

  const { data, isLoading, isFetching, error } = useWorkOrdersList(listParams);
  const { data: users = [] } = useWorkOrderUsers();

  const rows = data?.items ?? [];
  const totalCount = data?.totalCount ?? 0;

  const handleSort = (column: string) => {
    if (sortBy === column) {
      setSortDir((current) => (current === "asc" ? "desc" : current === "desc" ? "" : "asc"));
      if (sortDir === "desc") {
        setSortBy("");
      }
      return;
    }

    setSortBy(column);
    setSortDir("asc");
  };

  const sortIndicator = (column: string) => {
    if (sortBy !== column) {
      return "";
    }
    return sortDir === "desc" ? " ↓" : " ↑";
  };

  const handleStatusFilter = (status: string) => {
    setStatusFilter((current) => (current === status ? "" : status));
    setPage(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">
            Work Orders
          </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={(event) => {
              setSearch(event.target.value);
              setPage(0);
            }}
            placeholder="Search..."
            className="min-w-[220px]"
          />
          <Button variant="contained" onClick={() => navigate("/workorders/new")}>
            + New Work Order
          </Button>
        </Stack>
      </Stack>
      <Stack
        direction="row"
        spacing={1}
        useFlexGap
        sx={{
          flexWrap: "wrap",
          alignItems: "center",
        }}
      >
        <Chip
          label="All"
          clickable
          color={statusFilter === "" ? "primary" : "default"}
          variant={statusFilter === "" ? "filled" : "outlined"}
          onClick={() => {
            setStatusFilter("");
            setPage(0);
          }}
        />
        {STATUS_OPTIONS.map((status) => (
          <Chip
            key={status}
            label={status}
            clickable
            color={statusFilter === status ? "primary" : "default"}
            variant={statusFilter === status ? "filled" : "outlined"}
            onClick={() => handleStatusFilter(status)}
          />
        ))}

        <FormControl size="small" className="min-w-[180px]">
          <InputLabel id="assignee-filter-label">Assignee</InputLabel>
          <Select
            labelId="assignee-filter-label"
            label="Assignee"
            value={assigneeFilter}
            onChange={(event) => {
              setAssigneeFilter(event.target.value);
              setPage(0);
            }}
          >
            <MenuItem value="">All Assignees</MenuItem>
            <MenuItem value="__unassigned">Unassigned</MenuItem>
            {users.map((user) => (
              <MenuItem key={String(user.id)} value={user.name}>
                {user.name}
              </MenuItem>
            ))}
          </Select>
        </FormControl>
      </Stack>
      {error && (
        <Alert severity="error">
          {error instanceof Error ? error.message : "Failed to load work orders"}
        </Alert>
      )}
      <TableContainer component={Paper} variant="outlined">
        <Table size="small">
          <TableHead>
            <TableRow>
              <TableCell
                className="cursor-pointer whitespace-nowrap font-semibold"
                onClick={() => handleSort("number")}
              >
                WO #{sortIndicator("number")}
              </TableCell>
              <TableCell
                className="cursor-pointer font-semibold"
                onClick={() => handleSort("title")}
              >
                Title{sortIndicator("title")}
              </TableCell>
              <TableCell className="font-semibold">Location</TableCell>
              <TableCell className="font-semibold">Priority</TableCell>
              <TableCell className="font-semibold">Status</TableCell>
              <TableCell className="font-semibold">Created</TableCell>
              <TableCell className="font-semibold">Assigned To</TableCell>
              <TableCell className="font-semibold">Last Updated</TableCell>
              <TableCell align="right" className="font-semibold">
                Actions
              </TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {isLoading ? (
              <TableRow>
                <TableCell colSpan={9} align="center" className="py-10">
                  <CircularProgress size={28} />
                </TableCell>
              </TableRow>
            ) : rows.length === 0 ? (
              <TableRow>
                <TableCell colSpan={9} align="center" className="py-10">
                  <Typography
                    sx={{
                      color: "text.secondary",
                    }}
                  >
                    No work orders found
                  </Typography>
                </TableCell>
              </TableRow>
            ) : (
              rows.map((row: WorkOrderTableRow) => (
                <TableRow key={String(row.id)} hover>
                  <TableCell>
                    <Button
                      variant="text"
                      size="small"
                      className="font-semibold"
                      onClick={() => navigate(`/workorders/${row.id}`)}
                    >
                      {row.woNumber || row.id}
                    </Button>
                  </TableCell>
                  <TableCell>{row.title}</TableCell>
                  <TableCell>{row.location}</TableCell>
                  <TableCell>{row.priority}</TableCell>
                  <TableCell>
                    <WorkOrderStatusBadge status={row.status || "Open"} />
                  </TableCell>
                  <TableCell className="whitespace-nowrap">
                    {formatDateTime(row.scheduledOn)}
                  </TableCell>
                  <TableCell>{row.tech || "Unassigned"}</TableCell>
                  <TableCell className="whitespace-nowrap">{formatDateTime(row.dueDate)}</TableCell>
                  <TableCell align="right">
                    <Tooltip title="View">
                      <IconButton
                        size="small"
                        aria-label="View work order"
                        onClick={() => navigate(`/workorders/${row.id}`)}
                      >
                        <VisibilityOutlinedIcon fontSize="small" />
                      </IconButton>
                    </Tooltip>
                    <Tooltip title="Edit">
                      <IconButton
                        size="small"
                        aria-label="Edit work order"
                        onClick={() => navigate(`/workorders/edit/${row.id}`)}
                      >
                        <EditOutlinedIcon fontSize="small" />
                      </IconButton>
                    </Tooltip>
                  </TableCell>
                </TableRow>
              ))
            )}
          </TableBody>
        </Table>
      </TableContainer>
      <TablePagination
        component="div"
        count={totalCount}
        page={page}
        onPageChange={(_event, nextPage) => setPage(nextPage)}
        rowsPerPage={pageSize}
        onRowsPerPageChange={(event) => {
          setPageSize(Number(event.target.value));
          setPage(0);
        }}
        rowsPerPageOptions={[12, 24, 48]}
      />
    </Box>
  );
}