using System;
using System.Collections.Generic;

namespace HanvonF710XAttendanceService
{
    /// <summary>
    /// Lightweight unit tests for DB_TO_DEVICE planning logic (no MSTest dependency).
    /// </summary>
    internal static class DbToDevicePlanningTests
    {
        public static int RunAll()
        {
            int failed = 0;
            failed += Run("1 DB_TO_DEVICE ignores source device", TestDbToDeviceIgnoresSource);
            failed += Run("2 DEVICE_TO_DB requires source device", TestDeviceToDbRequiresSource);
            failed += Run("3 DB_TO_DEVICE allows empty SourceIp planning", TestDbToDeviceAllowsEmptySourceIp);
            failed += Run("4 EmpIds only selection", TestEmpIdsFilter);
            failed += Run("5 DepartmentIds selection", TestDepartmentIdsFallback);
            failed += Run("6 empty EmpIds uses registered employees", TestEmptyEmpIdsUsesRegistered);
            failed += Run("7 normalize employee ids", TestNormalizeEmployeeIds);
            failed += Run("8 DEVICE_TO_DEVICE requires source device", TestDeviceToDeviceRequiresSource);
            failed += Run("9 template load batches for 673 employees", TestTemplateLoadBatchCount673);
            return failed;
        }

        private static int Run(string name, Func<bool> test)
        {
            try
            {
                if (!test())
                {
                    Console.WriteLine("FAIL: " + name);
                    return 1;
                }
                Console.WriteLine("PASS: " + name);
                return 0;
            }
            catch (Exception ex)
            {
                Console.WriteLine("FAIL: " + name + " err=" + ex.Message);
                return 1;
            }
        }

        private static bool TestDbToDeviceIgnoresSource()
        {
            return DbToDevicePlanning.ShouldIgnoreSourceDevice(TemplateTransferMode.DB_TO_DEVICE);
        }

        private static bool TestDeviceToDbRequiresSource()
        {
            return !DbToDevicePlanning.ShouldIgnoreSourceDevice(TemplateTransferMode.DEVICE_TO_DB);
        }

        private static bool TestDeviceToDeviceRequiresSource()
        {
            return !DbToDevicePlanning.ShouldIgnoreSourceDevice(TemplateTransferMode.DEVICE_TO_DEVICE);
        }

        private static bool TestDbToDeviceAllowsEmptySourceIp()
        {
            var job = new TemplateTransferJob("1", true, "", new List<string> { "192.168.90.223" },
                new List<string> { "5" }, null);
            var ids = DbToDevicePlanning.ResolveEmployeeIds(job, _ => new List<string>(), () => new List<string> { "5" });
            return ids.Count == 1 && ids[0] == "5";
        }

        private static bool TestOtherModesRequireSource()
        {
            return TestDeviceToDbRequiresSource() && TestDeviceToDeviceRequiresSource();
        }

        private static bool TestEmpIdsFilter()
        {
            var job = new TemplateTransferJob("1", true, "10.0.1.3", new List<string> { "192.168.90.223" },
                new List<string> { "5", "55", "96" }, null);

            var ids = DbToDevicePlanning.ResolveEmployeeIds(
                job,
                _ => new List<string> { "999" },
                () => new List<string> { "999" });

            return ids.Count == 3
                && ids.Contains("5")
                && ids.Contains("55")
                && ids.Contains("96");
        }

        private static bool TestDepartmentIdsFallback()
        {
            var job = new TemplateTransferJob("1", true, "", new List<string> { "192.168.90.223" },
                null, new List<string> { "10", "20" });

            bool deptCalled = false;
            var ids = DbToDevicePlanning.ResolveEmployeeIds(
                job,
                departmentIds =>
                {
                    deptCalled = true;
                    return new List<string> { "100", "200" };
                },
                () => new List<string> { "300" });

            return deptCalled && ids.Count == 2 && ids.Contains("100") && ids.Contains("200");
        }

        private static bool TestEmptyEmpIdsUsesRegistered()
        {
            var job = new TemplateTransferJob("1", true, "", new List<string> { "192.168.90.223" },
                null, null);

            var ids = DbToDevicePlanning.ResolveEmployeeIds(
                job,
                _ => new List<string>(),
                () => new List<string> { "5", "55" });

            return ids.Count == 2 && ids.Contains("5") && ids.Contains("55");
        }

        private static bool TestNormalizeEmployeeIds()
        {
            var ids = DbToDevicePlanning.NormalizeEmployeeIds(new[] { " 5 ", "5", "", null, "96" });
            return ids.Count == 2 && ids[0] == "5" && ids[1] == "96";
        }

        private static bool TestTemplateLoadBatchCount673()
        {
            return DbToDevicePlanning.ComputeTemplateLoadBatchCount(673) == 14
                && DbToDevicePlanning.ComputeLastTemplateLoadBatchSize(673) == 23;
        }
    }
}