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

namespace SeaHaven.DataServices.Implementation
{
    public class ServicesRegistryDataService : IServicesRegistryDataService
    {
        private readonly ApplicationDbContext _context;

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

        public async Task<IReadOnlyList<ServiceRegistryRow>> GetServiceRowsAsync(bool? isActive, WorkOrderType? workOrderType, CancellationToken cancellationToken)
        {
            var query = _context.Services
                .AsNoTracking()
                .Where(s => s.IsDeleted != true);

            if (isActive.HasValue)
                query = query.Where(s => s.IsActive == isActive.Value);

            if (workOrderType.HasValue)
                query = query.Where(s => s.SupportedWorkOrderTypes.Any(t => t.WorkOrderType == workOrderType.Value));

            var rows = await query
                .OrderBy(s => s.Name)
                .Select(s => new ServiceRegistryRow
                {
                    Id = s.Id,
                    Name = s.Name,
                    Trade = s.Trade,
                    IconKey = s.IconKey,
                    RequiresCompletionDocument = s.RequiresCompletionDocument,
                    IsActive = s.IsActive,
                    CompletionDocTemplateId = s.CompletionDocTemplateId,
                    CompletionDocTemplateName = s.CompletionDocTemplate != null ? s.CompletionDocTemplate.Name : null,
                    SupportedWorkOrderTypes = s.SupportedWorkOrderTypes.Select(t => t.WorkOrderType).ToList()
                })
                .ToListAsync(cancellationToken);
            return rows;
        }

        public async Task<ServiceRegistryRow?> GetServiceRowByIdAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.Services.AsNoTracking()
                .Where(s => s.Id == id && s.IsDeleted != true)
                .Select(s => new ServiceRegistryRow
                {
                    Id = s.Id,
                    Name = s.Name,
                    Trade = s.Trade,
                    IconKey = s.IconKey,
                    RequiresCompletionDocument = s.RequiresCompletionDocument,
                    IsActive = s.IsActive,
                    CompletionDocTemplateId = s.CompletionDocTemplateId,
                    CompletionDocTemplateName = s.CompletionDocTemplate != null ? s.CompletionDocTemplate.Name : null,
                    SupportedWorkOrderTypes = s.SupportedWorkOrderTypes.Select(t => t.WorkOrderType).ToList()
                })
                .FirstOrDefaultAsync(cancellationToken);
        }

        public async Task<Service?> GetServiceForUpdateAsync(int id, CancellationToken cancellationToken)
        {
            return await _context.Services
                .Include(s => s.SupportedWorkOrderTypes)
                .FirstOrDefaultAsync(s => s.Id == id && s.IsDeleted != true, cancellationToken);
        }

        public async Task<bool> NormalizedNameExistsAsync(string normalizedName, int? excludeServiceId, CancellationToken cancellationToken)
        {
            return await _context.Services
                .AnyAsync(s => s.IsDeleted != true
                               && s.NormalizedName == normalizedName
                               && (excludeServiceId == null || s.Id != excludeServiceId),
                    cancellationToken);
        }

        public async Task<LinkedTemplateSummary?> GetActiveTemplateSummaryAsync(int templateId, CancellationToken cancellationToken)
        {
            return await _context.CompletionDocTemplates
                .Where(t => t.Id == templateId && t.IsActive && t.IsDeleted != true)
                .Select(t => new LinkedTemplateSummary { Id = t.Id, Name = t.Name })
                .FirstOrDefaultAsync(cancellationToken);
        }

        public async Task<Service> AddServiceAsync(Service service, CancellationToken cancellationToken)
        {
            await _context.Services.AddAsync(service, cancellationToken);
            await _context.SaveChangesAsync(cancellationToken);
            return service;
        }

        public async Task SaveServiceAsync(Service service, IReadOnlyCollection<WorkOrderType> supportedWorkOrderTypes, CancellationToken cancellationToken)
        {
            var desired = supportedWorkOrderTypes.Distinct().ToList();
            var current = service.SupportedWorkOrderTypes ?? new List<ServiceWorkOrderType>();

            var stale = current.Where(t => !desired.Contains(t.WorkOrderType)).ToList();
            _context.ServiceWorkOrderTypes.RemoveRange(stale);

            var existingTypes = current.Select(t => t.WorkOrderType).ToHashSet();
            foreach (var type in desired.Where(t => !existingTypes.Contains(t)))
            {
                _context.ServiceWorkOrderTypes.Add(new ServiceWorkOrderType
                {
                    ServiceId = service.Id,
                    WorkOrderType = type
                });
            }

            await _context.SaveChangesAsync(cancellationToken);
        }

        public async Task<bool> DeactivateServiceAsync(int id, CancellationToken cancellationToken)
        {
            var service = await _context.Services
                .FirstOrDefaultAsync(s => s.Id == id && s.IsDeleted != true, cancellationToken);
            if (service == null)
                return false;

            service.IsActive = false;
            await _context.SaveChangesAsync(cancellationToken);
            return true;
        }
    }
}