using Data.SeaHavenIndustries;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Helpers;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.DataServices.Models;

namespace SeaHaven.DataServices.Implementation
{
    public class WorkOrderDataService : IWorkOrderDataService
    {
        private readonly ApplicationDbContext _context;

        public WorkOrderDataService(ApplicationDbContext context)
        {
            _context = context;
        }

        public async Task<WorkOrder?> GetByIdAsync(int id)
        {
            return await _context.workOrders.FindAsync(id);
        }

        public async Task<WorkOrder?> GetByIdWithDetailsAsync(int id)
        {
            return await _context.workOrders
                .Include(w => w.Locations)
                .Include(w => w.AssignToUser)
                .FirstOrDefaultAsync(w => w.Id == id);
        }

        public async Task<WorkOrder?> GetByInternalNumberAsync(string internalNumber)
        {
            return await _context.workOrders
                .FirstOrDefaultAsync(w => w.InternalWONumber == internalNumber);
        }

        public async Task<IEnumerable<WorkOrder>> GetAllAsync()
        {
            return await _context.workOrders.ToListAsync();
        }

        public async Task<IEnumerable<WorkOrder>> GetByLocationIdAsync(int locationId)
        {
            return await _context.workOrders
                .Where(w => w.LocationId == locationId)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrder>> GetByAssigneeAsync(string assignee)
        {
            return await _context.workOrders
                .Where(w => w.AssignTo == assignee)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrder>> GetByStatusAsync(string status)
        {
            return await _context.workOrders
                .Where(w => w.Status == status)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrder>> GetByPriorityAsync(string priority)
        {
            return await _context.workOrders
                .Where(w => w.Priority == priority)
                .ToListAsync();
        }

        public async Task<(IEnumerable<WorkOrder> Items, int TotalCount)> GetPagedAsync(
            int page,
            int pageSize,
            string? search = null,
            string? status = null,
            string? priority = null)
        {
            var query = _context.workOrders.AsQueryable();

            if (!string.IsNullOrWhiteSpace(search))
            {
                query = query.Where(w =>
                    w.WorkerOrderNumber!.Contains(search) ||
                    w.WorkerOrderTitle!.Contains(search));
            }

            if (!string.IsNullOrWhiteSpace(status))
            {
                query = query.Where(w => w.Status == status);
            }

            if (!string.IsNullOrWhiteSpace(priority))
            {
                query = query.Where(w => w.Priority == priority);
            }

            var totalCount = await query.CountAsync();
            var items = await query
                .OrderByDescending(w => w.CreatedDate)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync();

            return (items, totalCount);
        }

        public async Task<(IEnumerable<WorkOrderListItemReadModel> Items, int TotalCount)> GetWorkOrderListPagedAsync(
            int page,
            int pageSize,
            string? search = null,
            string? status = null,
            string? assignee = null,
            int? locationId = null,
            string? sortBy = "lastUpdated",
            string? sortDir = "desc",
            int? accountId = null)
        {
            search ??= "";

            var query = _context.workOrders
                .Include(w => w.Locations)
                .Include(w => w.AssignToUser)
                .Where(w => w.istemplate != true);

            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            if (locationId.HasValue)
                query = query.Where(w => w.LocationId == locationId.Value);

            if (!string.IsNullOrWhiteSpace(status))
                query = query.Where(w => w.Status == status);

            if (assignee == "__unassigned")
                query = query.Where(w => w.AssignTo == null || w.AssignTo == "");
            else if (!string.IsNullOrWhiteSpace(assignee))
                query = query.Where(w => w.AssignToUser != null && (w.AssignToUser.FirstName + " " + w.AssignToUser.LastName).Contains(assignee));

            if (!string.IsNullOrWhiteSpace(search))
            {
                query = query.Where(w =>
                    (w.InternalWONumber != null && w.InternalWONumber.Contains(search)) ||
                    (w.WorkerOrderNumber != null && w.WorkerOrderNumber.Contains(search)) ||
                    (w.WorkerOrderTitle != null && w.WorkerOrderTitle.Contains(search)) ||
                    (w.Locations != null && w.Locations.Title != null && w.Locations.Title.Contains(search)) ||
                    (w.Locations != null && w.Locations.Name != null && w.Locations.Name.Contains(search))
                );
            }

            var totalCount = await query.CountAsync();

            var isAsc = sortDir?.ToLower() == "asc";
            IOrderedQueryable<WorkOrder> ordered = (sortBy?.ToLower()) switch
            {
                "number" => isAsc ? query.OrderBy(w => w.InternalWONumber) : query.OrderByDescending(w => w.InternalWONumber),
                "title" => isAsc ? query.OrderBy(w => w.WorkerOrderTitle) : query.OrderByDescending(w => w.WorkerOrderTitle),
                "location" => isAsc ? query.OrderBy(w => w.Locations != null ? w.Locations.Name : "") : query.OrderByDescending(w => w.Locations != null ? w.Locations.Name : ""),
                "priority" => isAsc ? query.OrderBy(w => w.Priority) : query.OrderByDescending(w => w.Priority),
                "status" => isAsc ? query.OrderBy(w => w.Status) : query.OrderByDescending(w => w.Status),
                "createddate" => isAsc ? query.OrderBy(w => w.CreatedDate) : query.OrderByDescending(w => w.CreatedDate),
                "assignedto" => isAsc ? query.OrderBy(w => w.AssignToUser != null ? w.AssignToUser.FirstName : "") : query.OrderByDescending(w => w.AssignToUser != null ? w.AssignToUser.FirstName : ""),
                "lastupdated" => isAsc ? query.OrderBy(w => w.LastModificationTime) : query.OrderByDescending(w => w.LastModificationTime),
                _ => query.OrderByDescending(w => w.Id)
            };

            var data = await ordered
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .Select(w => new WorkOrderListItemReadModel
                {
                    Id = w.Id,
                    InternalWONumber = w.InternalWONumber,
                    WorkOrderNumber = w.WorkerOrderNumber,
                    Number = w.InternalWONumber ?? w.WorkerOrderNumber,
                    Title = w.WorkerOrderTitle,
                    Location = w.Locations != null ? w.Locations.Name : "",
                    LocationName = w.Locations != null ? w.Locations.Name : "",
                    Priority = w.Priority,
                    Status = w.Status,
                    CreatedDate = w.CreatedDate,
                    DueDate = w.DueDate,
                    AssignedTo = w.AssignToUser != null ? w.AssignToUser.FirstName + " " + w.AssignToUser.LastName : "",
                    EmployeeName = w.AssignToUser != null ? w.AssignToUser.FirstName + " " + w.AssignToUser.LastName : "",
                    LastUpdated = new[] {
                        w.LastModificationTime,
                        w.Comments!.Max(c => (DateTime?)c.CreatedDate),
                        _context.WorkOrderAuditLogs.Where(a => a.WorkOrderId == w.Id).Max(a => (DateTime?)a.CreatedAt)
                    }.Where(d => d.HasValue).Max()
                })
                .ToListAsync();

            return (data, totalCount);
        }

        public async Task<WorkOrder> AddAsync(WorkOrder workOrder)
        {
            workOrder.CreatedDate ??= DateTime.UtcNow;
            await _context.workOrders.AddAsync(workOrder);
            await _context.SaveChangesAsync();
            return workOrder;
        }

        public async Task UpdateAsync(WorkOrder workOrder)
        {
            workOrder.LastModificationTime = DateTime.UtcNow;
            _context.workOrders.Update(workOrder);
            await _context.SaveChangesAsync();
        }

        public async Task DeleteAsync(int id)
        {
            var entity = await GetByIdAsync(id);
            if (entity != null)
            {
                _context.workOrders.Remove(entity);
                await _context.SaveChangesAsync();
            }
        }

        public async Task<IEnumerable<WorkOrderContacts>> GetWorkOrderContactsAsync(int workOrderId)
        {
            return await _context.WorkOrderContacts
                .Where(wc => wc.WorkorderId == workOrderId)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrderCategories>> GetWorkOrderCategoriesAsync(int workOrderId)
        {
            return await _context.workOrderCategories
                .Where(wc => wc.WorkorderId == workOrderId)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrderAttachments>> GetWorkOrderAttachmentsAsync(int workOrderId)
        {
            return await _context.workOrderAttachments
                .Where(wa => wa.WorkorderId == workOrderId)
                .ToListAsync();
        }

        public async Task<IEnumerable<Comments>> GetWorkOrderCommentsAsync(int workOrderId)
        {
            return await _context.Comments
                .Where(c => c.WorkerOrderId == workOrderId)
                .ToListAsync();
        }

        public async Task<IEnumerable<WorkOrderAuditLog>> GetWorkOrderAuditLogsAsync(int workOrderId)
        {
            return await _context.WorkOrderAuditLogs
                .Where(a => a.WorkOrderId == workOrderId)
                .OrderByDescending(a => a.CreatedAt)
                .ToListAsync();
        }

        public async Task AddWorkOrderContactsAsync(int workOrderId, IEnumerable<int> contactIds)
        {
            var contacts = contactIds.Select(cid => new WorkOrderContacts
            {
                WorkorderId = workOrderId,
                ContactId = cid
            });

            await _context.WorkOrderContacts.AddRangeAsync(contacts);
            await _context.SaveChangesAsync();
        }

        public async Task AddWorkOrderCategoriesAsync(int workOrderId, IEnumerable<int> categoryIds)
        {
            var categories = categoryIds.Select(catId => new WorkOrderCategories
            {
                WorkorderId = workOrderId,
                CategoryId = catId
            });

            await _context.workOrderCategories.AddRangeAsync(categories);
            await _context.SaveChangesAsync();
        }

        public async Task AddWorkOrderAttachmentAsync(WorkOrderAttachments attachment)
        {
            await _context.workOrderAttachments.AddAsync(attachment);
            await _context.SaveChangesAsync();
        }

        public async Task AddAuditLogAsync(WorkOrderAuditLog auditLog)
        {
            await _context.WorkOrderAuditLogs.AddAsync(auditLog);
            await _context.SaveChangesAsync();
        }

        public async Task AddAuditLogsAsync(IReadOnlyCollection<WorkOrderAuditLog> auditLogs)
        {
            if (auditLogs.Count == 0)
                return;

            await _context.WorkOrderAuditLogs.AddRangeAsync(auditLogs);
            await _context.SaveChangesAsync();
        }

        public async Task DeleteWorkOrderContactsAsync(int workOrderId)
        {
            var contacts = await _context.WorkOrderContacts
                .Where(wc => wc.WorkorderId == workOrderId)
                .ToListAsync();

            if (contacts.Any())
            {
                _context.WorkOrderContacts.RemoveRange(contacts);
                await _context.SaveChangesAsync();
            }
        }

        public async Task DeleteWorkOrderCategoriesAsync(int workOrderId)
        {
            var categories = await _context.workOrderCategories
                .Where(wc => wc.WorkorderId == workOrderId)
                .ToListAsync();

            if (categories.Any())
            {
                _context.workOrderCategories.RemoveRange(categories);
                await _context.SaveChangesAsync();
            }
        }

        public async Task DeleteWorkOrderAttachmentsAsync(int workOrderId)
        {
            var attachments = await _context.workOrderAttachments
                .Where(wa => wa.WorkorderId == workOrderId)
                .ToListAsync();

            if (attachments.Any())
            {
                _context.workOrderAttachments.RemoveRange(attachments);
                await _context.SaveChangesAsync();
            }
        }

        public async Task<bool> ExistsAsync(int id)
        {
            return await _context.workOrders.AnyAsync(w => w.Id == id);
        }

        public async Task<bool> InternalNumberExistsAsync(string internalNumber, int? excludeId = null)
        {
            return await _context.workOrders.AnyAsync(w =>
                w.InternalWONumber == internalNumber &&
                (excludeId == null || w.Id != excludeId));
        }

        public async Task<string> GenerateNextInternalWONumberAsync()
        {
            return await Task.FromResult($"WO-{DateTime.Now:yyyyMMdd}-{new Random().Next(1000, 9999)}");
        }

        public async Task<int> CountAsync()
        {
            return await _context.workOrders.CountAsync();
        }

        public async Task<int> CountByStatusAsync(string status)
        {
            return await _context.workOrders.CountAsync(w => w.Status == status);
        }

        public async Task<int> CountByPriorityAsync(string priority)
        {
            return await _context.workOrders.CountAsync(w => w.Priority == priority);
        }

        public async Task<int> CountByLocationAsync(int locationId)
        {
            return await _context.workOrders.CountAsync(w => w.LocationId == locationId);
        }

        public async Task<IEnumerable<WorkOrder>> GetAllWithDetailsAsync(int? accountId = null)
        {
            IQueryable<WorkOrder> query = _context.workOrders
                .Where(w => w.istemplate != true);

            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            return await query
                .Include(w => w.Locations)
                .Include(w => w.AssignToUser)
                .AsSplitQuery()
                .ToListAsync();
        }

        public async Task<IReadOnlyList<WorkOrder>> GetByRequestedIdsWithDetailsAsync(
            IReadOnlyCollection<int> ids,
            CancellationToken cancellationToken)
        {
            var orderedIds = ids.Distinct().ToList();
            if (orderedIds.Count == 0)
                return Array.Empty<WorkOrder>();

            var loaded = await _context.workOrders
                .AsNoTracking()
                .Where(w => orderedIds.Contains(w.Id) && w.istemplate != true)
                .Include(w => w.Locations)
                .ToListAsync(cancellationToken);

            var byId = loaded.ToDictionary(w => w.Id);
            var ordered = new List<WorkOrder>(orderedIds.Count);
            foreach (var id in orderedIds)
            {
                if (byId.TryGetValue(id, out var workOrder))
                    ordered.Add(workOrder);
            }

            return ordered;
        }

        public async Task<WorkOrderDetailReadModel?> GetWorkOrderDetailAsync(int id, int? accountId = null)
        {
            var query = _context.workOrders
                .AsNoTracking()
                .Where(w => w.Id == id);

            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            return await query
                .Select(s => new WorkOrderDetailReadModel
                {
                    Id = s.Id,
                    InternalWONumber = s.InternalWONumber,
                    WorkerOrderNumber = s.WorkerOrderNumber,
                    Title = s.WorkerOrderTitle,
                    Description = s.Description,
                    CreatedDate = s.CreatedDate,
                    DueDate = s.DueDate,
                    ScheduledDate = s.ScheduledDate,
                    CompletedDate = s.CompletedDate,
                    Status = s.Status,
                    Assignee = s.AssignToUser != null ? s.AssignToUser.FirstName : "",
                    Location = s.Locations != null ? s.Locations.Name : "",
                    LocationId = s.LocationId,
                    LocationZip = s.Locations != null ? (s.Locations.Zip ?? ExtractZip(s.Locations.Address1)) : "",
                    Priority = s.Priority,
                    Problem = s.Problem,
                    Trade = s.Trade,
                    SubTrade = s.SubTrade,
                    VendorNTE = s.VendorNTE,
                    Source = s.Source,
                    PO = s.PO,
                    TT = s.TT,
                    Poc = s.WorkOrderContacts!.Select(c => new ContactReadModel
                    {
                        Id = c.Id,
                        Name = c.POC != null ? (c.POC.FirstName + " " + c.POC.LastName).Trim() : "",
                        Email = c.POC != null ? c.POC.Email : "",
                        Phone = c.POC != null ? c.POC.PhoneNumber : ""
                    }).ToList(),
                    Category = s.WorkOrderCategories!.Select(c => new CategoryReadModel
                    {
                        Id = c.Id,
                        Name = c.Category != null ? c.Category.Name : ""
                    }).ToList(),
                    Attachments = s.workOrderAttachments!.Select(a => new AttachmentReadModel
                    {
                        Id = a.Id,
                        Attachment = a.Attachments
                    }).ToList(),
                    BeforPhotoIssue = s.BeforPhotoIssue,
                    BeforPhotoAttachment = s.BeforPhotoAttachment,
                    AfterPhotoIssue = s.AfterPhotoIssue,
                    AfterPhotoAttachment = s.AfterPhotoAttachment,
                    SignOffName = s.SignOffName,
                    SignOffAttachment = s.SignOffAttachment,
                    SignOffSignature = s.SignOffSignature,
                    Comments = s.Comments!.Select(c => new CommentReadModel
                    {
                        Id = c.Id,
                        CreatedDate = c.CreatedDate,
                        Commenttext = c.Commenttext,
                        Commenter = c.Commenter,
                        RecordType = c.RecordType,
                        CommentType = c.CommentType,
                        Documents = c.Documents,
                        UserName = c.ApplicationUser != null ? c.ApplicationUser.FirstName : ""
                    }).ToList(),
                    Quotes = s.Quotes!.Select(q => new QuoteRefReadModel
                    {
                        Code = q.QuotId,
                        Id = q.Id
                    }).ToList(),
                    AuditLog = _context.WorkOrderAuditLogs
                        .Where(a => a.WorkOrderId == s.Id)
                        .OrderByDescending(a => a.CreatedAt)
                        .Select(a => new AuditLogReadModel
                        {
                            Id = a.Id,
                            FieldName = a.FieldName,
                            OldValue = a.OldValue,
                            NewValue = a.NewValue,
                            Action = a.Action,
                            CreatedAt = a.CreatedAt,
                            UserName = a.User != null ? a.User.FirstName + " " + a.User.LastName : ""
                        }).ToList(),
                    Dispatches = s.Dispatches!.Select(d => new DispatchReadModel
                    {
                        Id = d.Id,
                        DispatchNumber = d.DispatchNumber,
                        PONumber = d.PONumber,
                        NTEAmount = d.NTEAmount,
                        Description = d.Description,
                        Status = d.Status,
                        ScheduledDate = d.ScheduledDate,
                        CompletedDate = d.CompletedDate,
                        DispatchedAt = d.DispatchedAt,
                        EmailSent = d.EmailSent,
                        VendorName = d.Vendor != null ? d.Vendor.CompanyName : "",
                        VendorEmail = d.Vendor != null ? d.Vendor.Email : "",
                        VendorId = d.VendorId
                    }).ToList()
                }).FirstOrDefaultAsync();
        }

        public async Task<List<WorkOrder>> GetNonTemplateWorkOrdersWithLocationsAsync(int? accountId = null)
        {
            IQueryable<WorkOrder> query = _context.workOrders
                .Where(w => w.istemplate != true);

            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            return await query
                .Include(w => w.Locations)
                .ToListAsync();
        }

        private static string? ExtractZip(string? address)
        {
            if (string.IsNullOrWhiteSpace(address)) return null;
            var match = System.Text.RegularExpressions.Regex.Match(address, @"\b(\d{5})(?:-\d{4})?\b");
            return match.Success ? match.Groups[1].Value : null;
        }
    }
}