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

namespace SeaHaven.DataServices.Implementation
{
    public class WorkOrderMediaDataService : IWorkOrderMediaDataService
    {
        private readonly ApplicationDbContext _context;

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

        public Task<WorkOrder?> GetWorkOrderForMediaAuthAsync(
            int workOrderId,
            int? accountId,
            CancellationToken cancellationToken)
        {
            var query = WorkOrderBoardQueryFilters.ApplyBaseScope(_context.workOrders.AsNoTracking());
            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            return query.FirstOrDefaultAsync(w => w.Id == workOrderId, cancellationToken);
        }

        public Task<WorkOrder?> GetTrackedWorkOrderAsync(
            int workOrderId,
            int? accountId,
            CancellationToken cancellationToken)
        {
            var query = WorkOrderBoardQueryFilters.ApplyBaseScope(_context.workOrders);
            if (accountId.HasValue)
                query = WorkOrderBoardQueryFilters.ApplyAccountScope(query, accountId.Value);

            return query.FirstOrDefaultAsync(w => w.Id == workOrderId, cancellationToken);
        }

        public Task<WorkOrderAttachments?> GetAttachmentForReadAsync(
            int mediaId,
            int workOrderId,
            CancellationToken cancellationToken)
            => _context.workOrderAttachments
                .AsNoTracking()
                .FirstOrDefaultAsync(
                    a => a.Id == mediaId && a.WorkorderId == workOrderId && a.IsDeleted != true,
                    cancellationToken);

        public Task<WorkOrderAttachments?> GetTrackedAttachmentAsync(int mediaId, int workOrderId, CancellationToken cancellationToken)
            => _context.workOrderAttachments.FirstOrDefaultAsync(
                a => a.Id == mediaId && a.WorkorderId == workOrderId && a.IsDeleted != true,
                cancellationToken);

        public void TrackAttachment(WorkOrderAttachments attachment)
            => _context.workOrderAttachments.Add(attachment);

        public async Task<IReadOnlyList<string>> ListActiveAttachmentUrlsAsync(
            int workOrderId,
            CancellationToken cancellationToken)
        {
            var urls = await _context.workOrderAttachments
                .AsNoTracking()
                .Where(a => a.WorkorderId == workOrderId && a.IsDeleted != true && a.Attachments != null)
                .Select(a => a.Attachments!)
                .ToListAsync(cancellationToken);
            return urls;
        }

        public async Task<IReadOnlyList<string>> ListActiveVendorMediaContentTypesAsync(
            int workOrderId,
            CancellationToken cancellationToken)
        {
            // Uplift evidence also records the latest completion id in ReplacesDocumentId, so only
            // a newer completion version supersedes a document.
            return await _context.VendorCompletionDocuments
                .AsNoTracking()
                .Where(document => document.WorkOrderId == workOrderId
                    && (document.IsDeleted == null || document.IsDeleted == false)
                    && !_context.VendorCompletionDocuments.Any(newer =>
                        newer.ReplacesDocumentId == document.Id
                        && newer.Purpose == "Completion"
                        && (newer.IsDeleted == null || newer.IsDeleted == false)))
                .Select(document => document.ContentType)
                .ToListAsync(cancellationToken);
        }

        public void SetExpectedWorkOrderVersion(WorkOrder workOrder, byte[] version)
            => _context.Entry(workOrder).Property(w => w.RowVersion).OriginalValue = version;

        public void MarkWorkOrderModified(WorkOrder workOrder)
        {
            // Force a WO update so the RowVersion concurrency token is enforced when only
            // attachment rows change (category-only Extra mutations).
            var entry = _context.Entry(workOrder);
            if (entry.State == EntityState.Unchanged)
                entry.Property(w => w.Attachments).IsModified = true;
        }

        public Task SaveAsync(CancellationToken cancellationToken)
            => _context.SaveChangesAsync(cancellationToken);
    }
}