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

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<object> 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")
        {
            search ??= "";

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

            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))
            {
                var s = search.ToLower();
                query = query.Where(w =>
                    (w.InternalWONumber ?? "").ToLower().Contains(s) ||
                    (w.WorkerOrderNumber ?? "").ToLower().Contains(s) ||
                    (w.WorkerOrderTitle ?? "").ToLower().Contains(s) ||
                    (w.Locations.Title ?? "").ToLower().Contains(s) ||
                    (w.Locations.Name ?? "").ToLower().Contains(s)
                );
            }

            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
                {
                    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.Now;
            await _context.workOrders.AddAsync(workOrder);
            await _context.SaveChangesAsync();
            return workOrder;
        }

        public async Task UpdateAsync(WorkOrder workOrder)
        {
            workOrder.LastModificationTime = DateTime.Now;
            _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<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> CountByLocationAsync(int locationId)
        {
            return await _context.workOrders.CountAsync(w => w.LocationId == locationId);
        }
    }
}