using AutoMapper;
using Marco.Pms.DataAccess.Data;
using Marco.Pms.Model.Dtos.Master;
using Marco.Pms.Model.Employees;
using Marco.Pms.Model.Entitlements;
using Marco.Pms.Model.Expenses;
using Marco.Pms.Model.Master;
using Marco.Pms.Model.Utilities;
using Marco.Pms.Model.ViewModels.Master;
using Marco.Pms.Services.Service.ServiceInterfaces;
using MarcoBMS.Services.Service;
using Microsoft.EntityFrameworkCore;

namespace Marco.Pms.Services.Service
{
    public class MasterService : IMasterService
    {
        private readonly ApplicationDbContext _context;
        private readonly ILoggingService _logger;
        private readonly PermissionServices _permission;
        private readonly IMapper _mapper;

        public MasterService(
            ApplicationDbContext context,
            ILoggingService logger,
            PermissionServices permission,
            IMapper mapper)
        {
            _context = context;
            _logger = logger;
            _permission = permission;
            _mapper = mapper;
        }

        #region =================================================================== Expenses Type APIs ===================================================================

        public async Task<ApiResponse<object>> GetExpenseTypeListAsync(Employee loggedInEmployee, Guid tenantId)
        {
            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to fetch the list of expense type from different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }

                // Featching the list of Expenses Type.
                var typeList = await _context.ExpensesTypeMaster.Where(et => et.TenantId == tenantId).ToListAsync();
                var response = _mapper.Map<List<ExpensesTypeMasterVM>>(typeList);

                _logger.LogInfo("{Count} records of expense type have been fetched successfully by employee {EmployeeId}", response.Count, loggedInEmployee.Id);
                return ApiResponse<object>.SuccessResponse(response, $"{response.Count} records of expense type have been fetched successfully.", 200);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error occured while fetching list of expense type list by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(ex), 500);
            }

        }
        public async Task<ApiResponse<object>> CreateExpenseTypeAsync(ExpensesTypeMasterDto model, Employee loggedInEmployee, Guid tenantId)
        {
            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to add new expense type in different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }
                var hasManagePermission = await _permission.HasPermission(PermissionsMaster.ManageMasters, loggedInEmployee.Id);
                if (!hasManagePermission)
                {
                    _logger.LogWarning("Access DENIED for employee {EmployeeId} for managing EXPANSES TYPE MASTER.", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to Upload expenses for this project", 403);
                }
                var expensesType = _mapper.Map<ExpensesTypeMaster>(model);
                expensesType.TenantId = tenantId;

                _context.ExpensesTypeMaster.Add(expensesType);
                await _context.SaveChangesAsync();

                _logger.LogInfo("New Expense Type {ExpensesTypeId} was added by employee {EmployeeId}", expensesType.Id, loggedInEmployee.Id);

                var response = _mapper.Map<ExpensesTypeMasterVM>(expensesType);
                return ApiResponse<object>.SuccessResponse(response, "Expense type craeted Successfully", 201);
            }
            catch (DbUpdateException dbEx)
            {
                _logger.LogError(dbEx, "Database Exception occured while adding new expense type by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(dbEx), 500);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Exception occured while adding new expense type by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(ex), 500);
            }
        }

        #endregion

        #region =================================================================== Expenses Status APIs ===================================================================
        public async Task<ApiResponse<object>> GetExpensesStatusListAsync(Employee loggedInEmployee, Guid tenantId)
        {

            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to fetch the list of expense status from different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }

                // Featching the list of Expenses Status.
                var statusList = await _context.ExpensesStatusMaster.Where(es => es.TenantId == tenantId).ToListAsync();
                var response = _mapper.Map<List<ExpensesStatusMasterVM>>(statusList);

                var statusIds = statusList.Select(s => s.Id).ToList();
                var permissionStatusMapping = await _context.StatusPermissionMapping
                    .Where(ps => statusIds.Contains(ps.StatusId))
                    .GroupBy(ps => ps.StatusId)
                    .Select(g => new
                    {
                        StatusId = g.Key,
                        PermissionIds = g.Select(ps => ps.PermissionId).ToList()
                    }).ToListAsync();

                foreach (var status in response)
                {
                    status.PermissionIds = permissionStatusMapping.Where(ps => ps.StatusId == status.Id).Select(ps => ps.PermissionIds).FirstOrDefault();
                }

                _logger.LogInfo("{Count} records of expense status have been fetched successfully by employee {EmployeeId}", response.Count, loggedInEmployee.Id);
                return ApiResponse<object>.SuccessResponse(response, $"{response.Count} records of expense status have been fetched successfully.", 200);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error occured while fetching list of expense sattus list by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(ex), 500);
            }
        }

        public async Task<ApiResponse<object>> CreateExpensesStatusAsync(ExpensesStatusMasterDto model, Employee loggedInEmployee, Guid tenantId)
        {
            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to add new Expense Status in different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }
                var hasManagePermission = await _permission.HasPermission(PermissionsMaster.ManageMasters, loggedInEmployee.Id);
                if (!hasManagePermission)
                {
                    _logger.LogWarning("Access DENIED for employee {EmployeeId} for managing EXPENSE STATUS MASTER.", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to Upload expenses for this project", 403);

                }
                // Mapping the DTO to ExpensesStatusMaster Model
                var expensesStatus = _mapper.Map<ExpensesStatusMaster>(model);
                expensesStatus.TenantId = tenantId;

                _context.ExpensesStatusMaster.Add(expensesStatus);

                if (model.PermissionIds?.Any() ?? false)
                {
                    var permissionStatusMappings = model.PermissionIds.Select(p => new StatusPermissionMapping
                    {
                        PermissionId = p,
                        StatusId = expensesStatus.Id,
                        TenantId = tenantId
                    }).ToList();

                    _context.StatusPermissionMapping.AddRange(permissionStatusMappings);
                }
                await _context.SaveChangesAsync();

                _logger.LogInfo("New Expense Status {ExpensesStatusId} was added by employee {EmployeeId}", expensesStatus.Id, loggedInEmployee.Id);

                // Mapping the ExpensesStatusMaster Model to View Model
                var response = _mapper.Map<ExpensesStatusMasterVM>(expensesStatus);
                return ApiResponse<object>.SuccessResponse(response, "Expense Status craeted Successfully", 201);
            }
            catch (DbUpdateException dbEx)
            {
                _logger.LogError(dbEx, "Database Exception occured while adding new Expense Status by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(dbEx), 500);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Exception occured while adding new Expense Status by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(ex), 500);
            }
        }

        #endregion

        #region =================================================================== Payment mode APIs ===================================================================
        public async Task<ApiResponse<object>> GetPaymentModeListAsync(Employee loggedInEmployee, Guid tenantId)
        {
            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to fetch the list of payment modes from different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }

                // Featching the list of Payment Modes.
                var paymentModes = await _context.PaymentModeMatser.Where(pm => pm.TenantId == tenantId).ToListAsync();
                var response = _mapper.Map<List<PaymentModeMatserVM>>(paymentModes);

                _logger.LogInfo("{Count} records of payment modes have been fetched successfully by employee {EmployeeId}", response.Count, loggedInEmployee.Id);
                return ApiResponse<object>.SuccessResponse(response, $"{response.Count} records of payment modes have been fetched successfully.", 200);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error occured while featching list of payment modes list by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured while featching list of payment modes list", ExceptionMapper(ex), 500);
            }
        }
        public async Task<ApiResponse<object>> CreatePaymentModeAsync(PaymentModeMatserDto model, Employee loggedInEmployee, Guid tenantId)
        {
            try
            {
                // Validation if employee is taking action in same tenant
                if (tenantId != loggedInEmployee.TenantId)
                {
                    _logger.LogWarning("Employee {EmployeeId} attempted to add new payment mode in different tenant", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied", "User do not have access for this information", 403);
                }
                var hasManagePermission = await _permission.HasPermission(PermissionsMaster.ManageMasters, loggedInEmployee.Id);
                if (!hasManagePermission)
                {
                    _logger.LogWarning("Access DENIED for employee {EmployeeId} for managing PAYMENT MODE MASTER.", loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to Upload expenses for this project", 403);

                }
                // Mapping the DTO to PaymentModeMatser Model
                var paymentMode = _mapper.Map<PaymentModeMatser>(model);
                paymentMode.TenantId = tenantId;

                _context.PaymentModeMatser.Add(paymentMode);
                await _context.SaveChangesAsync();

                _logger.LogInfo("New Payment Mode {PaymentModeId} was added by employee {EmployeeId}", paymentMode.Id, loggedInEmployee.Id);

                // Mapping the PaymentModeMatser Model to View Model
                var response = _mapper.Map<PaymentModeMatserVM>(paymentMode);
                return ApiResponse<object>.SuccessResponse(response, "Payment Mode craeted Successfully", 201);
            }
            catch (DbUpdateException dbEx)
            {
                _logger.LogError(dbEx, "Database Exception occured while adding new payment mode by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(dbEx), 500);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Exception occured while adding new payment mode by employee {EmployeeId}", loggedInEmployee.Id);
                return ApiResponse<object>.ErrorResponse("Internal Error occured", ExceptionMapper(ex), 500);
            }
        }

        #endregion

        #region =================================================================== Helper Function ===================================================================
        private static object ExceptionMapper(Exception ex)
        {
            return new
            {
                Message = ex.Message,
                StackTrace = ex.StackTrace,
                Source = ex.Source,
                InnerException = new
                {
                    Message = ex.InnerException?.Message,
                    StackTrace = ex.InnerException?.StackTrace,
                    Source = ex.InnerException?.Source,
                }
            };
        }


        #endregion
    }
}