using AutoMapper;
using Marco.Pms.DataAccess.Data;
using Marco.Pms.Model.Dtos.ServiceProject;
using Marco.Pms.Model.Employees;
using Marco.Pms.Model.Entitlements;
using Marco.Pms.Model.ServiceProject;
using Marco.Pms.Model.Utilities;
using Marco.Pms.Model.ViewModels.Activities;
using Marco.Pms.Model.ViewModels.Expanses;
using Marco.Pms.Model.ViewModels.Master;
using Marco.Pms.Model.ViewModels.Projects;
using Marco.Pms.Model.ViewModels.ServiceProject;
using Marco.Pms.Services.Helpers;
using Marco.Pms.Services.Service.ServiceInterfaces;
using MarcoBMS.Services.Service;
using Microsoft.EntityFrameworkCore;

namespace Marco.Pms.Services.Service
{
    public class ServiceProjectService : IServiceProject
    {

        private readonly IDbContextFactory<ApplicationDbContext> _dbContextFactory;
        private readonly IServiceScopeFactory _serviceScopeFactory;
        private readonly ApplicationDbContext _context; // Keeping this for direct scoped context use where appropriate
        private readonly ILoggingService _logger;
        private readonly CacheUpdateHelper _cache;
        private readonly IMapper _mapper;

        public ServiceProjectService(IDbContextFactory<ApplicationDbContext> dbContextFactory,IServiceScopeFactory serviceScopeFactory, ApplicationDbContext context, ILoggingService logger, CacheUpdateHelper cache, IMapper mapper)
        {
            _serviceScopeFactory = serviceScopeFactory;
            _context = context;
            _logger = logger;
            _cache = cache;
            _mapper = mapper;
            _dbContextFactory = dbContextFactory;
        }


        public async Task<ApiResponse<object>> CreateServiceProject(ServiceProjectDto model, Guid tenantId, Employee loggedInEmployee)
        {
            using var scope = _serviceScopeFactory.CreateScope(); 
            var _firebase = scope.ServiceProvider.GetService<IFirebaseService>();

            var tenant = await _context.Tenants.FirstOrDefaultAsync(t => t.Id == tenantId && t.OrganizationId == loggedInEmployee.OrganizationId);

            if (tenant == null)
            {
                _logger.LogWarning("Access DENIED (OrgId:{OrgId}) by Employee {EmployeeId} for tenantId={TenantId}.",
                    loggedInEmployee.OrganizationId, loggedInEmployee.Id, tenantId);
                return ApiResponse<object>.ErrorResponse("Access Denied", "You do not have permission to create a service project for this tenant.", 403);
            }

            var serviceProject = _mapper.Map<ServiceProject>(model);
            serviceProject.Id = Guid.NewGuid();
            serviceProject.CreatedById = loggedInEmployee.Id;
            serviceProject.CreatedAt = DateTime.UtcNow;
            serviceProject.TenantId = tenantId;
            serviceProject.IsActive = true;

            var projectServiceMapping = model.ServiceIds.Select(serviceId => new ServiceProjectServiceMapping
            {
                ServiceId = serviceId,
                ProjectId = serviceProject.Id,
                TenantId = tenantId
            });
            try
            {
                _context.ServiceProjects.Add(serviceProject);
                _context.ServiceProjectServiceMapping.AddRange(projectServiceMapping);
                await _context.SaveChangesAsync();
                _logger.LogInfo("Service Project {ProjectId} created successfully for TenantId={TenantId}, by Employee {EmployeeId}.",
                  serviceProject.Id, tenantId, loggedInEmployee);

                var serviceProjectVm = _mapper.Map<ServiceProjectVm>(serviceProject);
                var services = await _context.ServiceMasters.Where(t => model.ServiceIds.Contains(t.Id) && t.TenantId == tenantId && t.IsActive).ToListAsync();

                serviceProjectVm.Services = _mapper.Map<List<ServiceMasterVM>>(services);

                serviceProjectVm.CreatedBy = _mapper.Map<BasicEmployeeVM>(loggedInEmployee);
                serviceProjectVm.CreatedAt = DateTime.UtcNow;
                return  ApiResponse<object>.SuccessResponse(serviceProjectVm, "An Successfullly occurred while saving the project.", 201);

            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "DB Failure: Service Project creation failed for TenantId={TenantId}. Rolling back.", tenantId);
                return ApiResponse<object>.ErrorResponse("An error occurred while saving the project.", ex.Message, 500);
            }


        }

        public async Task<ApiResponse<object>> GetServiceProjectList(Guid tenantId, Employee loggedInEmployee)
        {
            try
            {

                var serviceProjects = await _context.ServiceProjects.Include(sp=>sp.CreatedBy).Where(sp=>sp.TenantId == tenantId && sp.IsActive).ToListAsync();
                List<ServiceProjectList> serviceProjectLists = _mapper.Map<List<ServiceProjectList>>(serviceProjects);
                _logger.LogInfo("Successfully retrieved a total of {ProjectCount} projects.", serviceProjectLists.Count);
                return ApiResponse<object>.SuccessResponse(serviceProjectLists, "Projects retrieved successfully.", 200);

            }
            catch (Exception ex)
            {
                // --- Step 5: Graceful Error Handling ---
                _logger.LogError(ex, "An unexpected error occurred in GetAllProjects for tenant {TenantId}.", tenantId);
                return ApiResponse<object>.ErrorResponse("An internal server error occurred. Please try again later.", null, 500);
            }

        }


        public async Task<ApiResponse<object>> UpdateServiceProject(Guid id, ServiceProjectDto model, Guid tenantId, Employee loggedInEmployee)
        {
            try
            {

                var serviceProject = await _context.ServiceProjects.Where(sp => sp.Id == id && sp.TenantId == tenantId).FirstOrDefaultAsync(); 

                if(serviceProject == null)
                {
                    _logger.LogWarning("Attempt to update non-existent Service project with ID {ProjectId} by user {UserId}.", id, loggedInEmployee.Id);
                    return ApiResponse<object>.ErrorResponse("Project not found.", $"No project found with ID {id}.", 404);
                }



                _mapper.Map(model, serviceProject);


                serviceProject.UpdatedAt = DateTime.UtcNow;
                serviceProject.UpdatedById = loggedInEmployee.Id;
                await _context.SaveChangesAsync();

                
                 serviceProject = await _context.ServiceProjects.Include(sp => sp.UpdatedBy).Where(sp => sp.Id == id && sp.TenantId == tenantId).FirstOrDefaultAsync();

                var services = await _context.ServiceProjectServiceMapping.Include(t => t.Service).Where(t => t.ProjectId == serviceProject!.Id && t.Service != null && t.TenantId == tenantId).Select(t => t.Service!).ToListAsync();


                ServiceProjectVm serviceProjectVm = _mapper.Map<ServiceProjectVm>(serviceProject);

                serviceProjectVm.Services = _mapper.Map<List<ServiceMasterVM>>(services);

                return ApiResponse<object>.SuccessResponse(serviceProjectVm, "Service Project updated successfully.", 200);

            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "An unexpected error occurred in Updating Service Project for tenant {TenantId}.", tenantId);
                return ApiResponse<object>.ErrorResponse("An internal server error occurred. Please try again later.", null, 500);
            }

        }





    }
}