import { useState, useEffect } from "react";
import { useNavigate } from "react-router";
import { toast } from "react-toastify";
import usePaginatedList from "../../../hooks/usePaginatedList";
import { fetchWorkOrdersPaged } from "./api";
import { fetchUsers } from "../api";
import Table from "./Table";
import DeleteModal from "../../../components/DeleteModal";
import "./styles.css";

export default function WorkOrdersList() {
  const navigate = useNavigate();
  const {
    rows, search, setSearch, page, setPage, pageSize, setPageSize,
    totalCount, loading, err, sortBy, setSortBy, sortDir, setSortDir
  } = usePaginatedList(fetchWorkOrdersPaged);

  const [deleteModal, setDeleteModal] = useState({
    isOpen: false,
    item: null,
    loading: false
  });

  const totalPages = Math.max(1, Math.ceil(totalCount / pageSize));

  const handleDeleteClick = (item) => {
    setDeleteModal({ isOpen: true, item, loading: false });
  };

  const handleDeleteConfirm = async () => {
    setDeleteModal((prev) => ({ ...prev, loading: true }));
    try {
      await new Promise((resolve) => setTimeout(resolve, 500));
      toast.success("Work Order deleted successfully!");
      setDeleteModal({ isOpen: false, item: null, loading: false });
    } catch {
      toast.error("Failed to delete work order");
      setDeleteModal((prev) => ({ ...prev, loading: false }));
    }
  };

  const [statusFilter, setStatusFilter] = useState("");
  const [assigneeFilter, setAssigneeFilter] = useState("");
  const [users, setUsers] = useState([]);
  const statuses = ["Open", "In Progress", "On Hold", "Done", "Cancelled"];

  useEffect(() => {
    fetchUsers().then(setUsers).catch(() => {});
  }, []);

  const filteredRows = rows.filter((r) => {
    if (statusFilter && r.status !== statusFilter) return false;
    if (assigneeFilter === "__unassigned" && r.assignedTo) return false;
    if (assigneeFilter && assigneeFilter !== "__unassigned" && r.assignedTo !== assigneeFilter) return false;
    return true;
  });

  const hasFilter = statusFilter || assigneeFilter;

  return (
    <>
      <section className="listPage">
        <div className="woListToolbar">
          <div className="woListToolbarLeft">
            <h2 className="woListTitle">Work Orders</h2>
            <span className="woListCount">
              {hasFilter ? `${filteredRows.length} of ${totalCount}` : `${totalCount} total`}
            </span>
          </div>
          <div className="woListToolbarRight">
            <input
              className="woSearchInput"
              value={search}
              onChange={(e) => { setSearch(e.target.value); setPage(1); }}
              placeholder="Search..."
            />
            <button className="woNewBtn" onClick={() => navigate("/workorders/new")}>
              + New Work Order
            </button>
          </div>
        </div>

        <div className="woFilterBar">
          <button
            className={`woFilterChip ${statusFilter === "" ? "active" : ""}`}
            onClick={() => setStatusFilter("")}
          >
            All
          </button>
          {statuses.map((s) => (
            <button
              key={s}
              className={`woFilterChip ${statusFilter === s ? "active" : ""}`}
              onClick={() => setStatusFilter(statusFilter === s ? "" : s)}
            >
              {s}
            </button>
          ))}
          <span className="woFilterDivider" />
          <select
            className="woFilterSelect"
            value={assigneeFilter}
            onChange={(e) => setAssigneeFilter(e.target.value)}
          >
            <option value="">All Assignees</option>
            <option value="__unassigned">Unassigned</option>
            {users.map((u) => (
              <option key={u.id} value={u.name}>{u.name}</option>
            ))}
          </select>
        </div>

        <Table
          loading={loading}
          error={err}
          rows={filteredRows}
          onEdit={(item) => navigate(`/workorders/${item.id}`)}
          onDelete={handleDeleteClick}
          page={page}
          setPage={setPage}
          pageSize={pageSize}
          setPageSize={setPageSize}
          totalCount={hasFilter ? filteredRows.length : totalCount}
          totalPages={totalPages}
          sortBy={sortBy}
          setSortBy={setSortBy}
          sortDir={sortDir}
          setSortDir={setSortDir}
        />

        <DeleteModal
          isOpen={deleteModal.isOpen}
          onClose={() =>
            setDeleteModal({ isOpen: false, item: null, loading: false })
          }
          onConfirm={handleDeleteConfirm}
          title="Delete Work Order"
          message={`Are you sure you want to delete "${deleteModal.item?.title}"? This action cannot be undone.`}
          loading={deleteModal.loading}
        />
      </section>
    </>
  );
}