using Marco.Pms.DataAccess.Data;
using Marco.Pms.Model.Activities;
using Marco.Pms.Model.Dtos.Attendance;
using Marco.Pms.Model.Employees;
using Marco.Pms.Model.Entitlements;
using Marco.Pms.Model.Expenses;
using Marco.Pms.Model.Projects;
using Marco.Pms.Model.Utilities;
using Marco.Pms.Model.ViewModels.DashBoard;
using Marco.Pms.Services.Service;
using Marco.Pms.Services.Service.ServiceInterfaces;
using MarcoBMS.Services.Helpers;
using MarcoBMS.Services.Service;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System.Globalization;

namespace Marco.Pms.Services.Controllers
{
    [Authorize]
    [Route("api/[controller]")]
    [ApiController]
    public class DashboardController : ControllerBase
    {
        private readonly ApplicationDbContext _context;
        private readonly UserHelper _userHelper;
        private readonly IProjectServices _projectServices;
        private readonly ILoggingService _logger;
        private readonly PermissionServices _permissionServices;
        private readonly IServiceScopeFactory _serviceScopeFactory;
        public static readonly Guid ActiveId = Guid.Parse("b74da4c2-d07e-46f2-9919-e75e49b12731");
        private static readonly Guid Draft = Guid.Parse("297e0d8f-f668-41b5-bfea-e03b354251c8");
        private static readonly Guid Review = Guid.Parse("6537018f-f4e9-4cb3-a210-6c3b2da999d7");
        private static readonly Guid Approve = Guid.Parse("4068007f-c92f-4f37-a907-bc15fe57d4d8");
        private static readonly Guid ProcessPending = Guid.Parse("f18c5cfd-7815-4341-8da2-2c2d65778e27");
        private static readonly Guid Processed = Guid.Parse("61578360-3a49-4c34-8604-7b35a3787b95");
        private static readonly Guid RejectedByReviewer = Guid.Parse("965eda62-7907-4963-b4a1-657fb0b2724b");
        private static readonly Guid RejectedByApprover = Guid.Parse("d1ee5eec-24b6-4364-8673-a8f859c60729");
        private readonly Guid tenantId;

        public DashboardController(ApplicationDbContext context,
            UserHelper userHelper,
            IProjectServices projectServices,
            IServiceScopeFactory serviceScopeFactory,
            ILoggingService logger,
            PermissionServices permissionServices)
        {
            _context = context;
            _userHelper = userHelper;
            _projectServices = projectServices;
            _logger = logger;
            _serviceScopeFactory = serviceScopeFactory;
            _permissionServices = permissionServices;
            tenantId = userHelper.GetTenantId();
        }
        [HttpGet("progression")]
        public async Task<IActionResult> GetGraph([FromQuery] double days, [FromQuery] string FromDate, [FromQuery] Guid? projectId)
        {
            var LoggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

            DateTime fromDate = new DateTime();
            DateTime toDate = new DateTime();
            List<ProjectProgressionVM>? projectProgressionVMs = new List<ProjectProgressionVM>();
            if (FromDate != null && DateTime.TryParse(FromDate, out fromDate) == false)
            {
                return BadRequest(ApiResponse<object>.ErrorResponse("Invalid starting date.", "Invalid starting date.", 400));

            }
            var firstTask = await _context.TaskAllocations.Select(t => new { t.TenantId, t.AssignmentDate }).FirstOrDefaultAsync(t => t.TenantId == tenantId);
            if (FromDate == null) fromDate = DateTime.UtcNow.Date;
            if (firstTask == null) firstTask = new { TenantId = tenantId, AssignmentDate = DateTime.UtcNow };


            if (days >= 0)
            {
                double negativeDays = 0 - days;
                toDate = fromDate.AddDays(negativeDays);

                if (firstTask != null && (firstTask.AssignmentDate.Date >= toDate.Date))
                {
                    toDate = firstTask.AssignmentDate;
                }
                if (projectId == null)
                {
                    List<TaskAllocation> tasks = await _context.TaskAllocations.Where(t => t.AssignmentDate.Date <= fromDate.Date && t.AssignmentDate.Date >= toDate.Date && t.TenantId == tenantId).ToListAsync();

                    double flagDays = 0;
                    while (negativeDays < flagDays)
                    {
                        ProjectProgressionVM ProjectProgressionVM = new ProjectProgressionVM();
                        ProjectProgressionVM.ProjectId = projectId != null ? projectId.Value : Guid.Empty;
                        ProjectProgressionVM.ProjectName = "";
                        var date = fromDate.AddDays(flagDays);
                        if (date >= (firstTask != null ? firstTask.AssignmentDate.Date : null))
                        {
                            var todayTasks = tasks.Where(t => t.AssignmentDate.Date == date.Date).ToList();
                            double plannedTaks = 0;
                            double completedTasks = 0;
                            ProjectProgressionVM.Date = date;

                            foreach (var task in todayTasks)
                            {
                                plannedTaks += task.PlannedTask;
                                completedTasks += task.CompletedTask;
                            }
                            ProjectProgressionVM.PlannedTask = plannedTaks;
                            ProjectProgressionVM.CompletedTask = completedTasks;

                            projectProgressionVMs.Add(ProjectProgressionVM);
                        }
                        flagDays -= 1;
                    }
                    _logger.LogInfo("Project Progression report for all projects fetched successfully by employee {EmployeeId}", LoggedInEmployee.Id);
                }
                else
                {
                    var project = await _context.Projects.FirstOrDefaultAsync(p => p.Id == projectId);
                    List<Building> buildings = await _context.Buildings.Where(b => b.ProjectId == projectId && b.TenantId == tenantId).ToListAsync();
                    List<Guid> idList = buildings.Select(b => b.Id).ToList();

                    List<Floor> floors = await _context.Floor.Where(f => idList.Contains(f.BuildingId) && f.TenantId == tenantId).ToListAsync();
                    idList = floors.Select(f => f.Id).ToList();

                    List<WorkArea> workAreas = await _context.WorkAreas.Where(a => idList.Contains(a.FloorId) && a.TenantId == tenantId).ToListAsync();
                    idList = workAreas.Select(a => a.Id).ToList();

                    List<WorkItem> workItems = await _context.WorkItems.Where(i => idList.Contains(i.WorkAreaId) && i.TenantId == tenantId).ToListAsync();
                    idList = workItems.Select(i => i.Id).ToList();

                    List<TaskAllocation> tasks = await _context.TaskAllocations.Where(t => idList.Contains(t.WorkItemId) && t.AssignmentDate.Date <= fromDate.Date && t.AssignmentDate.Date >= toDate.Date && t.TenantId == tenantId).ToListAsync();
                    if (project != null)
                    {
                        double flagDays = 0;
                        while (negativeDays < flagDays)
                        {
                            ProjectProgressionVM projectProgressionVM = new ProjectProgressionVM();
                            projectProgressionVM.ProjectId = projectId.Value;
                            projectProgressionVM.ProjectName = project.Name;
                            var date = fromDate.AddDays(flagDays);
                            if (date >= (firstTask != null ? firstTask.AssignmentDate.Date : null))
                            {
                                var todayTasks = tasks.Where(t => t.AssignmentDate.Date == date.Date).ToList();
                                double plannedTaks = 0;
                                double completedTasks = 0;
                                projectProgressionVM.Date = date;

                                foreach (var task in todayTasks)
                                {
                                    plannedTaks += task.PlannedTask;
                                    completedTasks += task.CompletedTask;
                                }
                                projectProgressionVM.PlannedTask = plannedTaks;
                                projectProgressionVM.CompletedTask = completedTasks;

                                projectProgressionVMs.Add(projectProgressionVM);
                            }

                            flagDays -= 1;
                        }
                    }
                    _logger.LogInfo("Project Progression  for project {ProjectId} fetched successfully by employee {EmployeeId}", projectId, LoggedInEmployee.Id);
                }
            }
            return Ok(ApiResponse<object>.SuccessResponse(projectProgressionVMs, "Success", 200));
        }

        [HttpGet("projects")]
        public async Task<IActionResult> GetProjectCount()
        {
            var LoggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

            var projects = await _context.Projects.Where(p => p.TenantId == tenantId).ToListAsync();
            var projectStatus = await _context.StatusMasters.Where(s => s.Status == "Active" || s.Status == "In Progress").ToListAsync();
            var projectStatusIds = projectStatus.Select(s => s.Id).ToList();
            var ongoingProjects = projects.Where(p => projectStatusIds.Contains(p.ProjectStatusId)).ToList();

            ProjectDashboardVM projectDashboardVM = new ProjectDashboardVM
            {
                TotalProjects = projects.Count(),
                OngoingProjects = ongoingProjects.Count()
            };
            _logger.LogInfo("Number of total ongoing projects fetched by employee {EmployeeId}", LoggedInEmployee.Id);
            return Ok(ApiResponse<object>.SuccessResponse(projectDashboardVM, "Success", 200));
        }

        /// <summary>
        /// Retrieves a dashboard summary of total employees and today's attendance.
        /// If a projectId is provided, it returns totals for that project; otherwise, for all accessible active projects.
        /// </summary>
        /// <param name="projectId">Optional. The ID of a specific project to get totals for.</param>
        [HttpGet("teams")]
        public async Task<IActionResult> GetTotalEmployees([FromQuery] Guid? projectId)
        {
            try
            {
                var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

                _logger.LogInfo("GetTotalEmployees called by user {UserId} for ProjectId: {ProjectId}", loggedInEmployee.Id, projectId ?? Guid.Empty);

                // --- Step 1: Get the list of projects the user can access ---
                // This query is more efficient as it only selects the IDs needed.
                var projects = await _projectServices.GetMyProjectIdsAsync(tenantId, loggedInEmployee);

                var accessibleActiveProjectIds = await _context.Projects
                    .Where(p => p.ProjectStatusId == ActiveId && projects.Contains(p.Id))
                    .Select(p => p.Id)
                    .ToListAsync();

                if (!accessibleActiveProjectIds.Any())
                {
                    _logger.LogInfo("User {UserId} has no accessible active projects.", loggedInEmployee.Id);
                    return Ok(ApiResponse<TeamDashboardVM>.SuccessResponse(new TeamDashboardVM(), "No accessible active projects found.", 200));
                }

                // --- Step 2: Build the list of project IDs to query against ---
                List<Guid> finalProjectIds;

                if (projectId.HasValue)
                {
                    // Security Check: Ensure the requested project is in the user's accessible list.
                    var hasPermission = await _permissionServices.HasProjectPermission(loggedInEmployee, projectId.Value);
                    if (!hasPermission)
                    {
                        _logger.LogWarning("Access DENIED for user {UserId} on project {ProjectId} (not active or not accessible).", loggedInEmployee.Id, projectId.Value);
                        return StatusCode(403, ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to view this project, or it is not active.", 403));
                    }
                    finalProjectIds = new List<Guid> { projectId.Value };
                }
                else
                {
                    finalProjectIds = accessibleActiveProjectIds;
                }

                // --- Step 3: Run efficient aggregation queries SEQUENTIALLY ---
                // Since we only have one DbContext instance, we await each query one by one.

                // Query 1: Count total distinct employees allocated to the final project list
                int totalEmployees = await _context.ProjectAllocations
                    .Where(pa => pa.TenantId == tenantId &&
                                 finalProjectIds.Contains(pa.ProjectId) &&
                                 pa.IsActive)
                    .Select(pa => pa.EmployeeId)
                    .Distinct()
                    .CountAsync();

                // Query 2: Count total distinct employees who checked in today
                // Use an efficient date range check
                var today = DateTime.UtcNow.Date;
                var tomorrow = today.AddDays(1);

                int inTodays = await _context.Attendes
                    .Where(a => a.InTime >= today && a.InTime < tomorrow &&
                                 finalProjectIds.Contains(a.ProjectID))
                    .Select(a => a.EmployeeId)
                    .Distinct()
                    .CountAsync();

                // --- Step 4: Assemble the response ---
                var teamDashboardVM = new TeamDashboardVM
                {
                    TotalEmployees = totalEmployees,
                    InToday = inTodays
                };

                _logger.LogInfo("Successfully fetched team dashboard for user {UserId}. Total: {TotalEmployees}, InToday: {InToday}",
                    loggedInEmployee.Id, teamDashboardVM.TotalEmployees, teamDashboardVM.InToday);

                return Ok(ApiResponse<TeamDashboardVM>.SuccessResponse(teamDashboardVM, "Dashboard data retrieved successfully.", 200));
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "An unexpected error occurred in GetTotalEmployees for projectId {ProjectId}", projectId ?? Guid.Empty);
                return StatusCode(500, ApiResponse<object>.ErrorResponse("An internal server error occurred.", null, 500));
            }
        }

        /// <summary>
        /// Retrieves a dashboard summary of total planned and completed tasks.
        /// If a projectId is provided, it returns totals for that project; otherwise, for all accessible projects.
        /// </summary>
        /// <param name="projectId">Optional. The ID of a specific project to get totals for.</param>
        /// <returns>An ApiResponse containing the task dashboard summary.</returns>
        [HttpGet("tasks")] // Example route
        public async Task<IActionResult> GetTotalTasks1([FromQuery] Guid? projectId) // Changed to FromQuery as it's optional
        {
            try
            {
                var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

                _logger.LogInfo("GetTotalTasks called by user {UserId} for ProjectId: {ProjectId}", loggedInEmployee.Id, projectId ?? Guid.Empty);

                // --- Step 1: Build the base IQueryable for WorkItems ---
                // This query is NOT executed yet. We will add more filters to it.
                var baseWorkItemQuery = _context.WorkItems.Where(t => t.TenantId == tenantId);

                // --- Step 2: Apply Filters based on the request (Project or All Accessible) ---
                if (projectId.HasValue)
                {
                    // --- Logic for a SINGLE Project ---

                    // 2a. Security Check: Verify permission for the specific project.
                    var hasPermission = await _permissionServices.HasProjectPermission(loggedInEmployee, projectId.Value);
                    if (!hasPermission)
                    {
                        _logger.LogWarning("Access DENIED for user {UserId} on project {ProjectId}.", loggedInEmployee.Id, projectId.Value);
                        return StatusCode(403, ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to view this project.", 403));
                    }

                    // 2b. Add project-specific filter to the base query.
                    // This is more efficient than fetching workAreaIds separately.
                    baseWorkItemQuery = baseWorkItemQuery
                        .Where(wi => wi.WorkArea != null &&
                            wi.WorkArea.Floor != null &&
                            wi.WorkArea.Floor.Building != null &&
                            wi.WorkArea.Floor.Building.ProjectId == projectId.Value);
                }
                else
                {
                    // --- Logic for ALL Accessible Projects ---

                    // 2c. Get a list of all projects the user is allowed to see.
                    var accessibleProjectIds = await _projectServices.GetMyProjectIdsAsync(tenantId, loggedInEmployee);

                    if (!accessibleProjectIds.Any())
                    {
                        _logger.LogInfo("User {UserId} has no accessible projects.", loggedInEmployee.Id);
                        // Return a zeroed-out dashboard if the user has no projects.
                        return Ok(ApiResponse<TasksDashboardVM>.SuccessResponse(new TasksDashboardVM(), "No accessible projects found.", 200));
                    }

                    // 2d. Add a filter to include all work items from all accessible projects.
                    baseWorkItemQuery = baseWorkItemQuery
                        .Where(wi => wi.WorkArea != null &&
                            wi.WorkArea.Floor != null &&
                            wi.WorkArea.Floor.Building != null &&
                            accessibleProjectIds.Contains(wi.WorkArea.Floor.Building.ProjectId));
                }

                // --- Step 3: Execute the Aggregation Query ON THE DATABASE SERVER ---
                // This is the most powerful optimization. The database does all the summing.
                // EF Core translates this into a single, efficient SQL query like:
                // SELECT SUM(PlannedWork), SUM(CompletedWork) FROM WorkItems WHERE ...
                var tasksDashboardVM = await baseWorkItemQuery
                    .GroupBy(x => 1) // Group by a constant to aggregate all rows into one result.
                    .Select(g => new TasksDashboardVM
                    {
                        TotalTasks = g.Sum(wi => wi.PlannedWork),
                        CompletedTasks = g.Sum(wi => wi.CompletedWork)
                    })
                    .FirstOrDefaultAsync(); // Use FirstOrDefaultAsync as GroupBy might return no rows.

                // If the query returned no work items, the result will be null. Default to a zeroed object.
                tasksDashboardVM ??= new TasksDashboardVM();

                _logger.LogInfo("Successfully fetched task dashboard for user {UserId}. Total: {TotalTasks}, Completed: {CompletedTasks}",
                    loggedInEmployee.Id, tasksDashboardVM.TotalTasks, tasksDashboardVM.CompletedTasks);

                return Ok(ApiResponse<TasksDashboardVM>.SuccessResponse(tasksDashboardVM, "Dashboard data retrieved successfully.", 200));
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "An unexpected error occurred in GetTotalTasks for projectId {ProjectId}", projectId ?? Guid.Empty);
                return StatusCode(500, ApiResponse<object>.ErrorResponse("An internal server error occurred.", null, 500));
            }
        }

        [HttpGet("pending-attendance")]
        public async Task<IActionResult> GetPendingAttendance()
        {
            var LoggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

            var attendance = await _context.Attendes.Where(a => a.EmployeeId == LoggedInEmployee.Id && a.TenantId == tenantId).ToListAsync();
            if (attendance.Any())
            {
                var pendingRegularization = attendance.Where(a => a.Activity == ATTENDANCE_MARK_TYPE.REQUEST_REGULARIZE).ToList().Count;
                var pendingCheckOut = attendance.Where(a => a.OutTime == null).ToList().Count;
                var response = new
                {
                    PendingRegularization = pendingRegularization,
                    PendingCheckOut = pendingCheckOut
                };
                _logger.LogInfo("Number of pending regularization and pending check-out are fetched successfully for employee {EmployeeId}", LoggedInEmployee.Id);
                return Ok(ApiResponse<object>.SuccessResponse(response, "Pending regularization and pending check-out are fetched successfully", 200));
            }
            _logger.LogWarning("No attendance entry was found for employee {EmployeeId}", LoggedInEmployee.Id);
            return NotFound(ApiResponse<object>.ErrorResponse("No attendance entry was found for this employee", "No attendance entry was found for this employee", 404));
        }

        [HttpGet("project-attendance/{projectId}")]
        public async Task<IActionResult> GetProjectAttendance(Guid projectId, [FromQuery] string? date)
        {
            var LoggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

            DateTime currentDate = DateTime.UtcNow;
            List<ProjectProgressionVM>? projectProgressionVMs = new List<ProjectProgressionVM>();
            if (date != null && DateTime.TryParse(date, out currentDate) == false)
            {
                _logger.LogWarning($"user send invalid date");
                return BadRequest(ApiResponse<object>.ErrorResponse("Invalid date.", "Invalid date.", 400));

            }
            Project? project = await _context.Projects.FirstOrDefaultAsync(p => p.Id == projectId);
            if (project == null)
            {
                _logger.LogWarning("Employee {EmployeeId} was attempted to get project attendance for date {Date}, but project not found in database", LoggedInEmployee.Id, currentDate);
                return NotFound(ApiResponse<object>.ErrorResponse("Project not found", "Project not found", 404));
            }
            List<ProjectAllocation>? projectAllocation = await _context.ProjectAllocations.Where(p => p.ProjectId == projectId && p.IsActive && p.TenantId == tenantId).ToListAsync();
            var employeeIds = projectAllocation.Select(p => p.EmployeeId).Distinct().ToList();
            List<Employee>? employees = await _context.Employees.Where(e => employeeIds.Contains(e.Id)).ToListAsync();

            var attendances = await _context.Attendes.Where(a => employeeIds.Contains(a.EmployeeId) && a.ProjectID == projectId && a.InTime.HasValue && a.InTime.Value.Date == currentDate.Date).ToListAsync();
            List<EmployeeAttendanceVM> employeeAttendanceVMs = new List<EmployeeAttendanceVM>();
            foreach (var attendance in attendances)
            {

                Employee? employee = employees.FirstOrDefault(e => e.Id == attendance.EmployeeId);
                if (employee != null)
                {
                    EmployeeAttendanceVM employeeAttendanceVM = new EmployeeAttendanceVM
                    {
                        FirstName = employee.FirstName,
                        LastName = employee.LastName,
                        MiddleName = employee.MiddleName,
                        Comment = attendance.Comment,
                        InTime = attendance.InTime,
                        OutTime = attendance.OutTime
                    };

                    employeeAttendanceVMs.Add(employeeAttendanceVM);
                }
            }
            ProjectAttendanceVM projectAttendanceVM = new ProjectAttendanceVM();
            projectAttendanceVM.AttendanceTable = employeeAttendanceVMs;
            projectAttendanceVM.CheckedInEmployee = attendances.Count;
            projectAttendanceVM.AssignedEmployee = employeeIds.Count;

            _logger.LogInfo($"Attendance record for project {projectId} for date {currentDate.Date} by employee {LoggedInEmployee.Id}");
            return Ok(ApiResponse<object>.SuccessResponse(projectAttendanceVM, $"Attendance record for project {project.Name} for date {currentDate.Date}", 200));
        }

        [HttpGet("activities/{projectId}")]
        public async Task<IActionResult> GetActivities(Guid projectId, [FromQuery] string? date)
        {
            var LoggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();

            DateTime currentDate = DateTime.UtcNow;
            if (date != null && DateTime.TryParse(date, out currentDate) == false)
            {
                _logger.LogWarning($"user send invalid date");
                return BadRequest(ApiResponse<object>.ErrorResponse("Invalid date.", "Invalid date.", 400));

            }
            Project? project = await _context.Projects.FirstOrDefaultAsync(p => p.Id == projectId);
            if (project == null)
            {
                _logger.LogWarning("Employee {EmployeeId} was attempted to get activities performed for date {Date}, but project not found in database", LoggedInEmployee.Id, currentDate);
                return NotFound(ApiResponse<object>.ErrorResponse("Project not found", "Project not found", 404));
            }

            var buildings = await _context.Buildings.Where(b => b.ProjectId == project.Id).ToListAsync();
            var buildingIds = buildings.Select(b => b.Id).Distinct().ToList();

            var floors = await _context.Floor.Where(f => buildingIds.Contains(f.BuildingId)).ToListAsync();
            var floorIds = floors.Select(f => f.Id).Distinct().ToList();

            var areas = await _context.WorkAreas.Where(a => floorIds.Contains(a.FloorId)).ToListAsync();
            var areaIds = areas.Select(a => a.Id).Distinct().ToList();

            var workItems = await _context.WorkItems.Include(i => i.ActivityMaster).Where(i => areaIds.Contains(i.WorkAreaId)).ToListAsync();
            var itemIds = workItems.Select(i => i.Id).Distinct().ToList();

            var tasks = await _context.TaskAllocations.Where(t => itemIds.Contains(t.WorkItemId) && t.AssignmentDate.Date == currentDate.Date).ToListAsync();
            double totalPlannedTask = 0;
            double totalCompletedTask = 0;
            List<PerformedActivites> performedActivites = new List<PerformedActivites>();

            foreach (var task in tasks)
            {
                totalPlannedTask += task.PlannedTask;
                totalCompletedTask += task.CompletedTask;

                WorkItem workItem = workItems.FirstOrDefault(i => i.Id == task.WorkItemId) ?? new WorkItem();
                string activityName = (workItem.ActivityMaster != null ? workItem.ActivityMaster.ActivityName : "") ?? "";

                WorkArea workArea = areas.FirstOrDefault(a => a.Id == workItem.WorkAreaId) ?? new WorkArea();
                string areaName = workArea.AreaName ?? "";

                Floor floor = floors.FirstOrDefault(f => f.Id == workArea.FloorId) ?? new Floor();
                string floorName = floor.FloorName ?? "";

                Building building = buildings.FirstOrDefault(b => b.Id == floor.BuildingId) ?? new Building();
                string buildingName = building.Name ?? "";

                PerformedActivites performedTask = new PerformedActivites
                {
                    ActivityName = activityName,
                    BuldingName = buildingName,
                    FloorName = floorName,
                    WorkAreaName = areaName,
                    AssignedToday = task.PlannedTask,
                    CompletedToday = task.CompletedTask,
                };
                performedActivites.Add(performedTask);
            }
            var pendingReport = tasks.Where(t => t.ReportedDate == null).ToList().Count;

            ActivityReport report = new ActivityReport
            {
                PerformedActivites = performedActivites,
                TotalCompletedWork = totalCompletedTask,
                TotalPlannedWork = totalPlannedTask,
                ReportPending = pendingReport,
                TodaysAssigned = tasks.Count
            };
            _logger.LogInfo($"Record of performed activities for project {projectId} for date {currentDate.Date} by employee {LoggedInEmployee.Id}");
            return Ok(ApiResponse<object>.SuccessResponse(report, $"Record of performed activities for project {project.Name} for date {currentDate.Date}", 200));
        }

        [HttpGet("attendance-overview/{projectId}")]
        public async Task<IActionResult> GetAttendanceOverView(Guid projectId, [FromQuery] string days)
        {
            _logger.LogInfo("GetAttendanceOverView called for ProjectId: {ProjectId}, Days: {Days}", projectId, days);

            // Step 1: Validate project existence
            var project = await _context.Projects.AsNoTracking().FirstOrDefaultAsync(p => p.Id == projectId);
            if (project == null)
            {
                _logger.LogWarning("Project not found for ProjectId: {ProjectId}", projectId);
                return BadRequest(ApiResponse<object>.ErrorResponse("Project not found", "Project not found", 400));
            }

            // Step 2: Permission check
            var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();
            bool hasAssigned = await _permissionServices.HasProjectPermission(loggedInEmployee, projectId);

            if (!hasAssigned)
            {
                _logger.LogWarning("Unauthorized access attempt. EmployeeId: {EmployeeId}, ProjectId: {ProjectId}", loggedInEmployee.Id, projectId);
                return StatusCode(403, ApiResponse<object>.ErrorResponse(
                    "You don't have permission to access this feature",
                    "You don't have permission to access this feature", 403));
            }

            // Step 3: Validate and parse days input
            if (!int.TryParse(days, out int dayCount) || dayCount <= 0)
            {
                _logger.LogWarning("Invalid days input received: {Days}", days);
                return BadRequest(ApiResponse<object>.ErrorResponse("Invalid number of days", "Days must be a positive integer", 400));
            }

            // Step 4: Define date range
            DateTime today = DateTime.UtcNow.Date;
            DateTime startDate = today.AddDays(-dayCount);

            // Step 5: Load project allocations and related job roles
            var allocations = await _context.ProjectAllocations
                .Where(pa => pa.ProjectId == projectId)
                .ToListAsync();

            if (!allocations.Any())
            {
                _logger.LogInfo("No employee allocations found for project: {ProjectId}", projectId);
                return Ok(ApiResponse<object>.SuccessResponse(new List<AttendanceOverviewVM>(), "No allocations found", 200));
            }

            var jobRoleIds = allocations.Select(pa => pa.JobRoleId).Distinct().ToList();

            var jobRoles = await _context.JobRoles
                .Where(jr => jobRoleIds.Contains(jr.Id))
                .ToListAsync();

            // Step 6: Load attendance records for given date range
            var attendances = await _context.Attendes
                .Where(a =>
                    a.ProjectID == projectId &&
                    a.InTime.HasValue &&
                    a.InTime.Value.Date >= startDate &&
                    a.InTime.Value.Date <= today)
                .ToListAsync();

            var overviewList = new List<AttendanceOverviewVM>();

            // Step 7: Process attendance per date per role
            for (DateTime date = today; date > startDate; date = date.AddDays(-1))
            {
                foreach (var jobRole in jobRoles)
                {
                    var employeeIds = allocations
                        .Where(pa => pa.JobRoleId == jobRole.Id)
                        .Select(pa => pa.EmployeeId)
                        .ToList();

                    int presentCount = attendances
                        .Count(a => employeeIds.Contains(a.EmployeeId) && a.InTime!.Value.Date == date);

                    overviewList.Add(new AttendanceOverviewVM
                    {
                        Role = jobRole.Name,
                        Date = date.ToString("yyyy-MM-dd"),
                        Present = presentCount
                    });
                }
            }

            // Step 8: Order result for consistent presentation
            var sortedResult = overviewList
                .OrderByDescending(r => r.Date)
                .ThenByDescending(r => r.Present)
                .ToList();

            _logger.LogInfo("Attendance overview fetched. ProjectId: {ProjectId}, Records: {Count}", projectId, sortedResult.Count);

            return Ok(ApiResponse<object>.SuccessResponse(sortedResult, $"{sortedResult.Count} records fetched for attendance overview", 200));
        }

        [HttpGet("expense/monthly")]
        public async Task<IActionResult> GetExpenseReportByProjectsAsync([FromQuery] Guid? projectId, [FromQuery] Guid? categoryId, [FromQuery] int months)
        {

            try
            {
                // Read-only base filter with tenant scope and non-draft
                var baseQuery = _context.Expenses
                    .AsNoTracking()
                    .Where(e =>
                        e.TenantId == tenantId
                        && e.IsActive
                        && e.StatusId != Draft); // [Server Filters]

                if (months != 0)
                {
                    months = 0 - months;
                    var end = DateTime.UtcNow.Date;
                    var start = end.AddMonths(months); // inclusive EOD
                    baseQuery = baseQuery.Where(e => e.TransactionDate >= start
                        && e.TransactionDate <= end);
                }

                if (projectId.HasValue)
                    baseQuery = baseQuery.Where(e => e.ProjectId == projectId);

                if (categoryId.HasValue)
                    baseQuery = baseQuery.Where(e => e.ExpensesTypeId == categoryId);

                // Single server-side group/aggregate by project
                var report = await baseQuery
                     .AsNoTracking()
                     .GroupBy(e => new { e.TransactionDate.Year, e.TransactionDate.Month })
                     .Select(g => new
                     {
                         Year = g.Key.Year,
                         Month = g.Key.Month,
                         Total = g.Sum(x => x.Amount),
                         Count = g.Count()
                     })
                     .OrderBy(x => x.Year).ThenBy(x => x.Month)
                     .ToListAsync();

                var culture = CultureInfo.GetCultureInfo("en-IN"); // pick desired locale

                var response = report
                    .Select(x => new
                    {
                        MonthName = culture.DateTimeFormat.GetMonthName(x.Month), // e.g., "January"
                        Year = x.Year,
                        Total = x.Total,
                        Count = x.Count
                    }).ToList();

                _logger.LogInfo(
                    "GetExpenseReportByProjects completed. TenantId={TenantId}, Rows={Rows}",
                    tenantId, report.Count); // [Completion Log]

                return Ok(ApiResponse<object>.SuccessResponse(response, "Expense report by project fetched successfully", 200)); // [Success Response]
            }
            catch (OperationCanceledException)
            {
                _logger.LogWarning("GetExpenseReportByProjects canceled by client. TenantId={TenantId}", tenantId); // [Cancel Log]
                return StatusCode(499, ApiResponse<object>.ErrorResponse("Client has canceled the opration", "Client has canceled the opration", 499)); // [Cancel Response]
            }
            catch (Exception ex)
            {
                _logger.LogError(ex,
                    "GetExpenseReportByProjects failed. TenantId={TenantId}",
                    tenantId); // [Error Log]
                return StatusCode(500,
                    ApiResponse<object>.ErrorResponse("An error occurred while fetching the expense report.", 500)); // [Error Response]
            }
        }

        [HttpGet("expense/type")]
        public async Task<IActionResult> GetExpenseReportByExpenseTypeAsync([FromQuery] Guid? projectId, [FromQuery] DateTime startDate, [FromQuery] DateTime endDate)
        {
            // Structured log: entering action with filters
            _logger.LogDebug(
                "GetExpenseReportByExpenseType started. TenantId={TenantId}, ProjectId={ProjectId}, StartDate={StartDate}, EndDate={EndDate}",
                tenantId, projectId ?? Guid.Empty, startDate, endDate); // [Start Log] [memory:4][memory:1]


            try
            {
                // Compose base query: push filters to DB, avoid client evaluation
                IQueryable<Expenses> baseQuery = _context.Expenses
                    .AsNoTracking() // Reduce tracking overhead for read-only endpoint
                    .Where(e => e.TenantId == tenantId
                                && e.IsActive
                                && e.StatusId != Draft
                                && e.TransactionDate >= startDate
                                && e.TransactionDate <= endDate.AddDays(1).AddTicks(-1));

                if (projectId.HasValue)
                    baseQuery = baseQuery.Where(e => e.ProjectId == projectId.Value); // [Filter] [memory:7]

                // Project to a minimal shape before grouping to avoid loading navigation graphs
                // Group by expense type name; adjust to the correct key if ExpensesCategory is an enum or navigation
                var query = baseQuery
                    .Where(e => e.ExpensesType != null)
                    .Select(e => new
                    {
                        ExpenseTypeName = e.ExpensesType!.Name, // If enum, use e.ExpensesCategory.ToString()
                        Amount = e.Amount,
                        StatusId = e.StatusId
                    })
                    .GroupBy(x => x.ExpenseTypeName)
                    .Select(g => new
                    {
                        ProjectName = g.Key, // Original code used g.Key!.Name; here the grouping key is already a string
                        TotalApprovedAmount = g.Where(x => x.StatusId == Processed
                                                         || x.StatusId == ProcessPending).Sum(x => x.Amount),
                        TotalPendingAmount = g.Where(x => x.StatusId != Processed
                                                       && x.StatusId != RejectedByReviewer
                                                       && x.StatusId != RejectedByApprover)
                                              .Sum(x => x.Amount),
                        TotalRejectedAmount = g.Where(x => x.StatusId == RejectedByReviewer
                                                        || x.StatusId == RejectedByApprover)
                                               .Sum(x => x.Amount),
                        TotalProcessedAmount = g.Where(x => x.StatusId == Processed)
                                                .Sum(x => x.Amount)
                    })
                    .OrderBy(r => r.ProjectName); // Server-side order [memory:7]

                var report = await query.ToListAsync(); // Single round-trip [memory:7]

                var response = new
                {
                    Report = report,
                    TotalAmount = report.Sum(r => r.TotalApprovedAmount)
                };

                _logger.LogInfo(
                    "GetExpenseReportByExpenseType completed. TenantId={TenantId}, Filters: ProjectId={ProjectId}, StartDate={StartDate}, EndDate={EndDate}, Rows={RowCount}, TotalAmount={TotalAmount}",
                    tenantId, projectId ?? Guid.Empty, startDate, endDate, report.Count, response.TotalAmount); // [Completion Log] [memory:4]

                return Ok(ApiResponse<object>.SuccessResponse(response, "Expense report by expense type fetched successfully", 200)); // [Success Response] [memory:1]
            }
            catch (OperationCanceledException)
            {
                _logger.LogWarning("GetExpenseReportByExpenseType canceled by client. TenantId={TenantId}", tenantId); // [Cancel Log] [memory:4]
                return StatusCode(499, ApiResponse<object>.ErrorResponse("Client has canceled the opration", "Client has canceled the opration", 499)); // [Cancel Response] [memory:1]
            }
            catch (Exception ex)
            {
                _logger.LogError(ex,
                    "GetExpenseReportByExpenseType failed. TenantId={TenantId}, ProjectId={ProjectId}, StartDate={StartDate}, EndDate={EndDate}",
                    tenantId, projectId ?? Guid.Empty, startDate, endDate); // [Error Log] [memory:4]
                return StatusCode(StatusCodes.Status500InternalServerError,
                    ApiResponse<object>.ErrorResponse("An error occurred while fetching the expense report.", 500)); // [Error Response] [memory:1]
            }
        }

        [HttpGet("expense/pendings")]
        public async Task<IActionResult> GetPendingExpenseListAsync([FromQuery] Guid? projectId)
        {
            // Start log with correlation fields
            _logger.LogDebug(
                "GetPendingExpenseListAsync started. Project={ProjectId} TenantId={TenantId}", projectId ?? Guid.Empty, tenantId); // [Start Log]

            try
            {
                // Resolve current employee once; avoid using scoped services inside Task.Run
                var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync(); // [User Context]

                // Resolve permission service from current scope once
                using var scope = _serviceScopeFactory.CreateScope();

                // Fire permission checks concurrently without Task.Run; these are async I/O methods

                var hasReviewPermissionTask = Task.Run(async () =>
                {
                    var _permission = scope.ServiceProvider.GetRequiredService<PermissionServices>();
                    return await _permission.HasPermission(PermissionsMaster.ExpenseReview, loggedInEmployee.Id);
                });

                var hasApprovePermissionTask = Task.Run(async () =>
                {
                    var _permission = scope.ServiceProvider.GetRequiredService<PermissionServices>();
                    return await _permission.HasPermission(PermissionsMaster.ExpenseApprove, loggedInEmployee.Id);
                });

                var hasProcessPermissionTask = Task.Run(async () =>
                {
                    var _permission = scope.ServiceProvider.GetRequiredService<PermissionServices>();
                    return await _permission.HasPermission(PermissionsMaster.ExpenseProcess, loggedInEmployee.Id);
                });

                var hasManagePermissionTask = Task.Run(async () =>
                {
                    var _permission = scope.ServiceProvider.GetRequiredService<PermissionServices>();
                    return await _permission.HasPermission(PermissionsMaster.ExpenseManage, loggedInEmployee.Id);
                });

                await Task.WhenAll(hasReviewPermissionTask, hasApprovePermissionTask, hasProcessPermissionTask, hasManagePermissionTask); // [Parallel Await]

                var hasReviewPermission = hasReviewPermissionTask.Result;
                var hasApprovePermission = hasApprovePermissionTask.Result;
                var hasProcessPermission = hasProcessPermissionTask.Result;
                var hasManagePermission = hasManagePermissionTask.Result;

                _logger.LogInfo(
                    "Permissions resolved: Review={Review}, Approve={Approve}, Process={Process}",
                    hasReviewPermission, hasApprovePermission, hasProcessPermission); // [Permissions Log]

                // Build base query: read-only, tenant-scoped
                var baseQuery = _context.Expenses
                    .Include(e => e.Status)
                    .AsNoTracking() // Reduce tracking overhead for read-only list
                    .Where(e => e.IsActive && e.TenantId == tenantId && e.StatusId != Processed && e.Status != null); // [Base Filter]

                // Project to DTO in SQL to avoid heavy Include graph.
                if (projectId.HasValue)
                    baseQuery = baseQuery.Where(e => e.ProjectId == projectId);

                // Prefer ProjectTo when profiles exist; otherwise project minimal fields
                var expenses = await baseQuery
                    .ToListAsync(); // Single round-trip; no Include needed for this shape

                var draftExpenses = expenses.Where(e => e.StatusId == Draft && e.CreatedById == loggedInEmployee.Id).ToList();
                var reviewExpenses = expenses.Where(e => (hasReviewPermission || e.CreatedById == loggedInEmployee.Id) && e.StatusId == Review).ToList();
                var approveExpenses = expenses.Where(e => (hasApprovePermission || e.CreatedById == loggedInEmployee.Id) && e.StatusId == Approve).ToList();
                var processPendingExpenses = expenses.Where(e => (hasProcessPermission || e.CreatedById == loggedInEmployee.Id) && e.StatusId == ProcessPending).ToList();
                var submitedExpenses = expenses.Where(e => e.StatusId != Draft && e.CreatedById == loggedInEmployee.Id).ToList();
                var totalAmount = expenses.Where(e => e.StatusId != Draft).Sum(e => e.Amount);

                if (hasManagePermission)
                {
                    var response = new
                    {
                        Draft = new
                        {
                            Count = draftExpenses.Count,
                            TotalAmount = draftExpenses.Sum(e => e.Amount)
                        },
                        ReviewPending = new
                        {
                            Count = reviewExpenses.Count,
                            TotalAmount = reviewExpenses.Sum(e => e.Amount)
                        },
                        ApprovePending = new
                        {
                            Count = approveExpenses.Count,
                            TotalAmount = approveExpenses.Sum(e => e.Amount)
                        },
                        ProcessPending = new
                        {
                            Count = processPendingExpenses.Count,
                            TotalAmount = processPendingExpenses.Sum(e => e.Amount)
                        },
                        Submited = new
                        {
                            Count = submitedExpenses.Count,
                            TotalAmount = submitedExpenses.Sum(e => e.Amount)
                        },
                        TotalAmount = totalAmount
                    };
                    _logger.LogInfo(
                        "GetPendingExpenseListAsync completed. TenantId={TenantId}",
                        tenantId); // [Completion Log]

                    return Ok(ApiResponse<object>.SuccessResponse(response, "Pending Expenses fetched successfully", 200)); // [Success Response]
                }
                else
                {
                    var response = new
                    {
                        Draft = new
                        {
                            Count = draftExpenses.Count
                        },
                        ReviewPending = new
                        {
                            Count = reviewExpenses.Count
                        },
                        ApprovePending = new
                        {
                            Count = approveExpenses.Count
                        },
                        ProcessPending = new
                        {
                            Count = processPendingExpenses.Count
                        },
                        Submited = new
                        {
                            Count = submitedExpenses.Count
                        },
                        TotalAmount = totalAmount
                    };
                    _logger.LogInfo(
                        "GetPendingExpenseListAsync completed. TenantId={TenantId}",
                        tenantId); // [Completion Log]

                    return Ok(ApiResponse<object>.SuccessResponse(response, "Pending Expenses fetched successfully", 200)); // [Success Response]
                }
            }
            catch (OperationCanceledException)
            {
                _logger.LogWarning("GetPendingExpenseListAsync canceled by client. TenantId={TenantId}", tenantId); // [Cancel Log]
                return StatusCode(499, ApiResponse<object>.ErrorResponse("Client has canceled the opration", "Client has canceled the opration", 499)); // [Cancel Response]
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "GetPendingExpenseListAsync failed. TenantId={TenantId}", tenantId); // [Error Log]
                return StatusCode(500,
                    ApiResponse<object>.ErrorResponse("An error occurred while fetching pending expenses.", "An error occurred while fetching pending expenses.", 500)); // [Error Response]
            }
        }

    }
}