// Mock dependencies
jest.mock("../../Users/Users", () => ({
    __esModule: true,
    default: {
        users: {
            findOne: jest.fn(),
        },
        getUserFullName: jest.fn(),
    },
}));

jest.mock("../../Companies/Companies", () => ({
    __esModule: true,
    default: {
        companies: {
            findOne: jest.fn(),
        },
    },
}));

jest.mock("../../Services/Service", () => ({
    __esModule: true,
    default: {
        services: {
            find: jest.fn(),
            findOne: jest.fn(),
        },
    },
}));

jest.mock("../../Notifications/Notifications", () => ({
    __esModule: true,
    NotificationsManager: {
        sendSystemNotification: jest.fn(),
    },
}));

jest.mock("../../Employees/Employee", () => {
    const mockFindOne = jest.fn();
    const mockFind = jest.fn();
    const mockFindById = jest.fn();
    return {
        __esModule: true,
        default: {
            employees: {
                findOne: mockFindOne,
                find: mockFind,
                employeeList: {
                    findOne: mockFindOne,
                    find: mockFind,
                },
            },
            findById: mockFindById,
            checkPermission: jest.fn().mockResolvedValue(true),
            _mocks: { findOne: mockFindOne, find: mockFind, findById: mockFindById },
        },
    };
});

import EmployeesServicesList from "../EmployeesServices";
import EmployeesList from "../../Employees/Employee";

describe("EmployeesServices.findByService — removed employee exclusion", () => {
    let mockEmployeesFindOne: jest.Mock;
    let mockEmployeesFindById: jest.Mock;
    let originalEmployeesServicesAdapter: any;

    beforeEach(() => {
        jest.clearAllMocks();

        mockEmployeesFindOne = (EmployeesList as any)._mocks.findOne;
        mockEmployeesFindById = (EmployeesList as any)._mocks.findById;

        // Save and replace the employeesServices adapter
        originalEmployeesServicesAdapter = EmployeesServicesList.employeesServices;

        const mockESFindOne = jest.fn();
        const mockESFind = jest.fn();
        (EmployeesServicesList as any).employeesServices = {
            findOne: mockESFindOne,
            find: mockESFind,
            create: jest.fn(),
            delete: jest.fn(),
            update: jest.fn(),
            paginate: jest.fn(),
            employeesServicesList: {
                findOne: mockESFindOne,
                find: mockESFind,
                deleteMany: jest.fn(),
            },
        };
    });

    afterEach(() => {
        (EmployeesServicesList as any).employeesServices = originalEmployeesServicesAdapter;
    });

    it("excludes removed employees from findByService results", async () => {
        // Service assignments include one for an active employee and one for a removed employee
        const activeServiceAssignment = {
            _id: "es-001",
            employeeId: "emp-active",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const removedServiceAssignment = {
            _id: "es-002",
            employeeId: "emp-removed",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const activeEmployeeDoc = {
            _id: "emp-active",
            id: "emp-active",
            companyId: "company-001",
            userId: "user-active",
            removed: false,
        };

        const removedEmployeeDoc = {
            _id: "emp-removed",
            id: "emp-removed",
            companyId: "company-001",
            userId: "user-removed",
            removed: true,
        };

        // employeesServices.find returns both assignments
        const mockESFind = (EmployeesServicesList as any).employeesServices.find;
        mockESFind.mockResolvedValue([activeServiceAssignment, removedServiceAssignment]);

        // EmployeesList.employees.findOne returns the employee docs
        mockEmployeesFindOne
            .mockResolvedValueOnce(activeEmployeeDoc)
            .mockResolvedValueOnce(removedEmployeeDoc);

        // EmployeesList.findById for the active employee
        mockEmployeesFindById.mockResolvedValue({
            id: "emp-active",
            fullName: "Active User",
            avatar: "",
        });

        const result = await EmployeesServicesList.findByService({
            serviceId: "svc-001",
        });

        // Only the active employee should appear in results
        expect(result).toHaveLength(1);
        expect(result[0].id).toBe("emp-active");
        expect(result[0].name).toBe("Active User");
    });

    it("returns empty when all assigned employees are removed", async () => {
        const removedServiceAssignment = {
            _id: "es-001",
            employeeId: "emp-removed",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const removedEmployeeDoc = {
            _id: "emp-removed",
            id: "emp-removed",
            companyId: "company-001",
            userId: "user-removed",
            removed: true,
        };

        const mockESFind = (EmployeesServicesList as any).employeesServices.find;
        mockESFind.mockResolvedValue([removedServiceAssignment]);

        mockEmployeesFindOne.mockResolvedValueOnce(removedEmployeeDoc);

        const result = await EmployeesServicesList.findByService({
            serviceId: "svc-001",
        });

        expect(result).toEqual([]);
        expect(result).toHaveLength(0);
        // Prove the guard stopped processing: employee was found but removed,
        // so findById should NEVER have been called for enrichment.
        expect((EmployeesList as any)._mocks.findById).not.toHaveBeenCalled();
    });

    it("excludes employees whose Employee document is null (hard-deleted User)", async () => {
        // Scenario: service assignment exists but the Employee record was hard-deleted
        // (e.g. cascade cleanup). findByService must skip gracefully.
        const activeServiceAssignment = {
            _id: "es-001",
            employeeId: "emp-active",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const orphanServiceAssignment = {
            _id: "es-002",
            employeeId: "emp-orphan",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const activeEmployeeDoc = {
            _id: "emp-active",
            id: "emp-active",
            companyId: "company-001",
            userId: "user-active",
            removed: false,
        };

        const mockESFind = (EmployeesServicesList as any).employeesServices.find;
        mockESFind.mockResolvedValue([activeServiceAssignment, orphanServiceAssignment]);

        // First findOne: active employee → found; second: orphan → null (deleted)
        mockEmployeesFindOne
            .mockResolvedValueOnce(activeEmployeeDoc)
            .mockResolvedValueOnce(null);

        mockEmployeesFindById.mockResolvedValue({
            id: "emp-active",
            fullName: "Active User",
            avatar: "",
        });

        const result = await EmployeesServicesList.findByService({
            serviceId: "svc-001",
        });

        // Only the active employee should appear
        expect(result).toHaveLength(1);
        expect(result[0].id).toBe("emp-active");
        // findById was called once for the active employee only
        expect(mockEmployeesFindById).toHaveBeenCalledTimes(1);
        expect(mockEmployeesFindById).toHaveBeenCalledWith({ id: "emp-active" });
    });

    it("does not call findById for removed employees, only for active ones", async () => {
        // Proves the continue guard prevents enrichment calls for removed employees.
        const activeAssignment = {
            _id: "es-001",
            employeeId: "emp-active",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const removedAssignment = {
            _id: "es-002",
            employeeId: "emp-removed",
            serviceId: "svc-001",
            companyId: "company-001",
        };

        const activeDoc = {
            _id: "emp-active",
            id: "emp-active",
            removed: false,
        };

        const removedDoc = {
            _id: "emp-removed",
            id: "emp-removed",
            removed: true,
        };

        const mockESFind = (EmployeesServicesList as any).employeesServices.find;
        mockESFind.mockResolvedValue([activeAssignment, removedAssignment]);

        mockEmployeesFindOne
            .mockResolvedValueOnce(activeDoc)
            .mockResolvedValueOnce(removedDoc);

        mockEmployeesFindById.mockResolvedValue({
            id: "emp-active",
            fullName: "Active User",
            avatar: "",
        });

        const result = await EmployeesServicesList.findByService({
            serviceId: "svc-001",
        });

        // findById called ONCE (active only), never for the removed employee
        expect(mockEmployeesFindById).toHaveBeenCalledTimes(1);
        expect(mockEmployeesFindById).toHaveBeenCalledWith({ id: "emp-active" });
        expect(result).toHaveLength(1);
    });
});

// ─────────────────────────────────────────────────────────────────────────────
// Public Booking Path — Limitation Documentation
// ─────────────────────────────────────────────────────────────────────────────
//
// The actual public booking flow for collaborator resolution is:
//
//   Frontend (Appointment.tsx)
//     → POST /employees/employees-by-service
//       → FindEmployeesByServiceController.findEmployeesByService()
//         → new EmployeesService().findByService(requestBody)    [thin wrapper: connect() + delegate]
//           → EmployeesServicesList.findByService(data)          [model — tested above]
//
// The model layer (EmployeesServicesManager.findByService) is the GATEKEEPER
// that applies the `removed` guard. The controller and service classes are thin
// pass-through wrappers with no additional filtering logic.
//
// Full-path integration testing (controller → service → model → DB) is not
// practically unit-testable because:
//   1. The service layer calls mongoose.connect() which requires a real DB
//   2. The controller instantiates the service class internally
//   3. 5+ collections would need seeding (Employees, EmployeesServices, Users, Companies)
//
// The model-level tests above provide the STRONGEST feasible coverage because:
//   - They exercise the exact `removed` guard logic (line 444 of EmployeesServices.ts)
//   - They prove findById enrichment is skipped for removed/null employees
//   - They prove the correct filter is applied to service assignment queries
//   - The controller/service layers add no filtering — they are pure delegation
// ─────────────────────────────────────────────────────────────────────────────