using AutoMapper;
using Marco.Pms.DataAccess.Data;
using Marco.Pms.Model.Dtos.Expenses;
using Marco.Pms.Model.Entitlements;
using Marco.Pms.Model.Expenses;
using Marco.Pms.Model.Utilities;
using Marco.Pms.Model.ViewModels.Expanses;
using Marco.Pms.Model.ViewModels.Master;
using Marco.Pms.Services.Service;
using MarcoBMS.Services.Helpers;
using MarcoBMS.Services.Service;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Document = Marco.Pms.Model.DocumentManager.Document;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace Marco.Pms.Services.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    [Authorize]
    public class ExpenseController : ControllerBase
    {
        private readonly ApplicationDbContext _context;
        private readonly UserHelper _userHelper;
        private readonly PermissionServices _permission;
        private readonly ILoggingService _logger;
        private readonly S3UploadService _s3Service;
        private readonly IMapper _mapper;
        private readonly Guid tenantId;
        public ExpenseController(
            ApplicationDbContext context,
            UserHelper userHelper,
            PermissionServices permission,
            ILoggingService logger,
            S3UploadService s3Service,
            IMapper mapper)
        {
            _context = context;
            _userHelper = userHelper;
            _permission = permission;
            _logger = logger;
            _s3Service = s3Service;
            _mapper = mapper;
            tenantId = userHelper.GetTenantId();
        }

        [HttpGet("list")]
        public async Task<IActionResult> GetExpensesList()
        {
            var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();
            var loggedInEmployeeId = loggedInEmployee.Id;

            List<Expenses>? expensesList = null;
            var expensesListQuery = _context.Expenses
                .Include(e => e.ExpensesType)
                .Include(e => e.Project)
                .Include(e => e.PaidBy)
                    .ThenInclude(e => e!.JobRole)
                .Include(e => e.PaymentMode)
                .Include(e => e.Status)
                .Include(e => e.CreatedBy)
                .Where(e => e.TenantId == tenantId);

            var HasViewAllPermission = await _permission.HasPermission(PermissionsMaster.ExpenseViewAll, loggedInEmployeeId);
            var HasViewSelfPermission = await _permission.HasPermission(PermissionsMaster.ExpenseViewSelf, loggedInEmployeeId);

            if (HasViewAllPermission)
            {
                expensesList = await expensesListQuery.ToListAsync();
            }
            else if (HasViewSelfPermission)
            {
                expensesList = await expensesListQuery.Where(e => e.CreatedById == loggedInEmployeeId).ToListAsync();
            }

            if (expensesList == null)
            {
                _logger.LogInfo("No Expense found for employee {EmployeeId}", loggedInEmployeeId);
                return Ok(ApiResponse<object>.SuccessResponse(new List<ExpenseList>(), "No Expense found for current user", 200));
            }

            //ImageFilter? imageFilter = null;
            //if (!string.IsNullOrWhiteSpace(filter))
            //{
            //    try
            //    {
            //        var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
            //        //string unescapedJsonString = JsonSerializer.Deserialize<string>(filter, options) ?? "";
            //        //imageFilter = JsonSerializer.Deserialize<ImageFilter>(unescapedJsonString, options);
            //        imageFilter = JsonSerializer.Deserialize<ImageFilter>(filter, options);
            //    }
            //    catch (Exception ex)
            //    {
            //        _logger.LogWarning("[GetImageList] Failed to parse filter: {Message}", ex.Message);
            //    }
            //}


            var response = _mapper.Map<List<ExpenseList>>(expensesList);

            var statusIds = expensesList.Select(e => e.StatusId).ToList();

            var statusMappings = await _context.ExpensesStatusMapping
                .Include(sm => sm.NextStatus)
                .Where(sm => statusIds.Contains(sm.StatusId))
                .ToListAsync();

            foreach (var expense in response)
            {
                var statusMapping = statusMappings.Where(sm => sm.StatusId == expense.Status?.Id).Select(sm => _mapper.Map<ExpensesStatusMasterVM>(sm.NextStatus)).ToList();
                expense.NextStatus = statusMapping;

            }
            return StatusCode(200, ApiResponse<object>.SuccessResponse(response, $"{response.Count} records of expenses for you fetched successfully", 200));
        }

        [HttpGet("details/{id}")]
        public string Get(int id)
        {
            return "value";
        }

        [HttpPost("create")]
        public async Task<IActionResult> Post([FromBody] CreateExpensesDto dto)
        {
            var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();
            var hasUploadPermission = await _permission.HasPermission(PermissionsMaster.ExpenseUpload, loggedInEmployee.Id);
            var hasProjectPermission = await _permission.HasProjectPermission(loggedInEmployee, dto.ProjectId);
            if (!hasUploadPermission || !hasProjectPermission)
            {
                _logger.LogWarning("Access DENIED for employee {EmployeeId} for uploading expense on project {ProjectId}.", loggedInEmployee.Id, dto.ProjectId);
                return StatusCode(403, ApiResponse<object>.ErrorResponse("Access Denied.", "You do not have permission to Upload expenses for this project", 403));
            }
            var isExpensesTypeExist = await _context.ExpensesTypeMaster.AnyAsync(et => et.Id == dto.ExpensesTypeId);
            if (!isExpensesTypeExist)
            {
                _logger.LogWarning("Expenses type not for ID: {ExpensesTypeId} when creating new expense", dto.ExpensesTypeId);
                return NotFound(ApiResponse<object>.ErrorResponse("Expanses Type not found", "Expanses Type not found", 404));
            }
            var isPaymentModeExist = await _context.PaymentModeMatser.AnyAsync(et => et.Id == dto.PaymentModeId);
            if (!isPaymentModeExist)
            {
                _logger.LogWarning("Payment Mode not for ID: {PaymentModeId} when creating new expense", dto.PaymentModeId);
                return NotFound(ApiResponse<object>.ErrorResponse("Payment Mode not found", "Payment Mode not found", 404));
            }
            var isStatusExist = await _context.ExpensesStatusMaster.AnyAsync(et => et.Id == dto.StatusId);
            if (!isStatusExist)
            {
                _logger.LogWarning("Status not for ID: {PaymentModeId} when creating new expense", dto.PaymentModeId);
                return NotFound(ApiResponse<object>.ErrorResponse("Status not found", "Status not found", 404));
            }
            var expense = new Expenses
            {
                ProjectId = dto.ProjectId,
                ExpensesTypeId = dto.ExpensesTypeId,
                PaymentModeId = dto.PaymentModeId,
                PaidById = dto.PaidById,
                CreatedById = loggedInEmployee.Id,
                TransactionDate = dto.TransactionDate,
                CreatedAt = DateTime.UtcNow,
                TransactionId = dto.TransactionId,
                Description = dto.Description,
                Location = dto.Location,
                GSTNumber = dto.GSTNumber,
                SupplerName = dto.SupplerName,
                Amount = dto.Amount,
                NoOfPersons = dto.NoOfPersons,
                StatusId = dto.StatusId,
                PreApproved = dto.PreApproved,
                IsActive = true,
                TenantId = tenantId
            };
            _context.Expenses.Add(expense);


            Guid batchId = Guid.NewGuid();
            foreach (var attachment in dto.BillAttachments)
            {
                //if (!_s3Service.IsBase64String(attachment.Base64Data))
                //{
                //    _logger.LogWarning("Image upload failed: Base64 data is missing While creating new expense entity for project {ProjectId} by employee {EmployeeId}", expense.ProjectId, expense.PaidById);
                //    return BadRequest(ApiResponse<object>.ErrorResponse("Base64 data is missing", "Base64 data is missing", 400));
                //}
                var base64 = attachment.Base64Data!.Contains(',')
                        ? attachment.Base64Data[(attachment.Base64Data.IndexOf(",") + 1)..]
                        : attachment.Base64Data;

                var fileType = _s3Service.GetContentTypeFromBase64(base64);
                var fileName = _s3Service.GenerateFileName(fileType, expense.Id, "Expense");
                var objectKey = $"tenant-{tenantId}/project-{expense.ProjectId}/Expenses/{fileName}";
                try
                {
                    await _s3Service.UploadFileAsync(base64, fileType, objectKey);
                    _logger.LogInfo("Image uploaded to S3 with key: {ObjectKey}", objectKey);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Error occured while saving image to S3");
                    //return BadRequest(ApiResponse<object>.ErrorResponse("Cannot upload attachment to S3", new
                    //{
                    //    message = ex.Message,
                    //    innerexcption = ex.InnerException?.Message,
                    //    stackTrace = ex.StackTrace,
                    //    source = ex.Source
                    //}, 400));
                }

                var document = new Document
                {
                    BatchId = batchId,
                    UploadedById = loggedInEmployee.Id,
                    FileName = attachment.FileName ?? "",
                    ContentType = attachment.ContentType ?? "",
                    S3Key = objectKey,
                    //Base64Data = attachment.Base64Data,
                    FileSize = attachment.FileSize,
                    UploadedAt = DateTime.UtcNow,
                    TenantId = tenantId
                };
                _context.Documents.Add(document);

                var billAttachement = new BillAttachments
                {
                    DocumentId = document.Id,
                    ExpensesId = expense.Id,
                    TenantId = tenantId
                };
                _context.BillAttachments.Add(billAttachement);
            }
            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateException dbEx)
            {
                _logger.LogError(dbEx, "Error occured while saving Expense, Document and bill attachment entity");
                return BadRequest(ApiResponse<object>.ErrorResponse("Databsae Exception", new
                {
                    Message = dbEx.Message,
                    StackTrace = dbEx.StackTrace,
                    Source = dbEx.Source,
                    innerexcption = new
                    {
                        Message = dbEx.InnerException?.Message,
                        StackTrace = dbEx.InnerException?.StackTrace,
                        Source = dbEx.InnerException?.Source,
                    }
                }, 400));
            }
            _logger.LogInfo("Documents and attachments saved for Expense: {ExpenseId}", expense.Id);

            return StatusCode(201, ApiResponse<object>.SuccessResponse(expense, "Expense created Successfully", 201));
        }


        [HttpPut("edit/{id}")]
        public void Put(int id, [FromBody] string value)
        {
        }

        [HttpDelete("delete/{id}")]
        public void Delete(int id)
        {
        }
    }
}