import React, { useState, useEffect } from "react";
import Avatar from "../../common/Avatar";
import { useDebounce } from "../../../utils/appUtils";
import { useSelectedProject } from "../../../slices/apiDataManager";
import { useOrganizationEmployees } from "../../../hooks/useOrganization";
import {
  useEmployeesByProjectAllocated,
  useManageProjectAllocation,
} from "../../../hooks/useProjects";
import useMaster, { useServices } from "../../../hooks/masterHook/useMaster";
import showToast from "../../../services/toastService";

const TeamEmployeeList = ({ organizationId, searchTerm, closeModal }) => {
  const selectedProject = useSelectedProject();
  const debounceSearchTerm = useDebounce(searchTerm, 500);

  const {
    data: employeesData = [],
    isLoading,
    isError,
    error,
  } = useOrganizationEmployees(
    selectedProject,
    organizationId,
    debounceSearchTerm
  );

  const { projectEmployees, loading: employeeLodaing } =
    useEmployeesByProjectAllocated(selectedProject, null);

  const { data: jobRoles } = useMaster();
  const { data: services } = useServices();

  const [employees, setEmployees] = useState([]);

  const { mutate: handleAssignEmployee, isPending } =
    useManageProjectAllocation({
      onSuccessCallback: () => {
        closeModal();
      },
      onErrorCallback: () => {
        closeModal();
      },
    });

  useEffect(() => {
    if (employeesData?.data?.length > 0) {
      const available = employeesData.data.filter((emp) => {
        const projEmp = projectEmployees.find((pe) => pe.employeeId === emp.id);
        return !projEmp || projEmp.isActive === false;
      });

      setEmployees(
        available.map((emp) => ({
          ...emp,
          isChecked: false,
          jobRole: emp?.jobRoleId || null,
          serviceId: "",
          errors: {},
        }))
      );
    }
  }, [employeesData, projectEmployees, organizationId]);

  const handleCheckboxChange = (index) => {
    setEmployees((prev) => {
      const newArr = [...prev];
      newArr[index].isChecked = !newArr[index].isChecked;
      newArr[index].errors = {};
      return newArr;
    });
  };

  const handleSelectChange = (index, field, value) => {
    setEmployees((prev) => {
      const newArr = [...prev];
      newArr[index][field] = value;
      newArr[index].errors[field] = "";
      return newArr;
    });
  };

  const onSubmit = () => {
    const checkedEmployees = employees.filter((emp) => emp.isChecked);

    setEmployees((prev) => prev.map((emp) => ({ ...emp, errors: {} })));

    if (checkedEmployees.length === 0) {
      showToast("Select at least one employee", "info");
      return;
    }

    let hasError = false;
    const newEmployees = employees.map((emp) => {
      const empErrors = {};
      if (emp.isChecked) {
        if (!emp.jobRole) {
          empErrors.jobRole = "Job role is required";
          hasError = true;
        }
        if (!emp.serviceId) {
          empErrors.serviceId = "Service is required";
          hasError = true;
        }
      }
      return { ...emp, errors: empErrors };
    });

    setEmployees(newEmployees);

    if (hasError) return; // stop submit if validation fails

    const payload = checkedEmployees.map((emp) => ({
      employeeId: emp.id,
      jobRoleId: emp.jobRole,
      serviceId: emp.serviceId,
      projectId: selectedProject,
      status: true,
    }));

    handleAssignEmployee({ payload,actionType:"assign"} );

    setEmployees((prev) =>
      prev.map((emp) => ({
        ...emp,
        isChecked: false,
        jobRole: "",
        serviceId: "",
        errors: {},
      }))
    );
  };

if (isLoading) {
  return (   <div className="page-min-h d-flex justify-content-center align-items-center "><p className="text-muted">Loading employees...</p></div>) ;
}

if (isError) {
  return (
    <div className="page-min-h d-flex justify-content-center align-items-center ">
  {error?.status === 400 ? (
    <p className="m-0">Enter employee you want to find.</p>
  ) : (
    <p className="m-0 dange-text">Something went wrong. Please try again later.</p>
  )}
</div>

  );
}

if (employees.length === 0) {
  return(<div className="page-min-h d-flex justify-content-center align-items-center "><p className="text-muted">No available employees to assign.</p></div>) ;
}


  return (
    <div className=" position-relative">
      <table className="table" style={{ maxHeight: "80px", overflowY: "auto" }}>
        <thead className=" position-sticky top-0">
          <tr>
            <th>Employee</th>
            <th>Service</th>
            <th>Job Role</th>
            <th>Select</th>
          </tr>
        </thead>
        <tbody>
          {employees.map((emp, index) => (
            <tr key={emp.id}>
              <td>
                <div className="d-flex align-items-center">
                  <Avatar firstName={emp.firstName} lastName={emp.lastName} />
                  <span className="ms-2 fw-semibold">
                    {emp.firstName} {emp.lastName}
                  </span>
                </div>
              </td>
              <td>
                <select
                  value={emp.serviceId}
                  disabled={!emp.isChecked}
                  onChange={(e) =>
                    handleSelectChange(index, "serviceId", e.target.value)
                  }
                  className={`form-select form-select-sm w-auto border-none rounded-0 py-1 px-auto ${
                    emp.errors.serviceId ? "is-invalid" : ""
                  }`}
                >
                  <option value="">Select Service</option>
                  {services?.data?.map((s) => (
                    <option key={s.id} value={s.id}>
                      {s.name}
                    </option>
                  ))}
                </select>
                {emp.errors.serviceId && (
                  <div className="danger-text">{emp.errors.serviceId}</div>
                )}
              </td>
              <td>
                <select
                  value={emp.jobRole}
                  disabled={!emp.isChecked}
                  onChange={(e) =>
                    handleSelectChange(index, "jobRole", e.target.value)
                  }
                  className={`form-select form-select-sm w-auto border-none rounded-0 py-1 px-auto ${
                    emp.errors.jobRole ? "is-invalid" : ""
                  }`}
                >
                  <option value="">Select Job Role</option>
                  {jobRoles?.map((r) => (
                    <option key={r.id} value={r.id}>
                      {r.name}
                    </option>
                  ))}
                </select>
                {emp.errors.jobRole && (
                  <div className="danger-text">{emp.errors.jobRole}</div>
                )}
              </td>
              <td>
                <input
                  type="checkbox"
                  className="form-check-input"
                  checked={emp.isChecked}
                  onChange={() => handleCheckboxChange(index)}
                />
              </td>
            </tr>
          ))}
        </tbody>
      </table>
      <div className="position-sticky bottom-0 bg-white  d-flex justify-content-end gap-3 z-25 ">
        <button
          type="button"
          className="btn btn-sm btn-label-secondary"
          onClick={() => closeModal()}
        >
          Cancel
        </button>
        <button onClick={onSubmit} className="btn btn-primary">
          {isPending ? "Please Wait..." : "Assign to Project"}
        </button>
      </div>
    </div>
  );
};

export default TeamEmployeeList;