namespace EgwCoreLib.Lux.Data.Repository.Job
{
    public class JobTaskRepository : BaseRepository, IJobTaskRepository
    {
        #region Public Constructors

        public JobTaskRepository(IDbContextFactory<DataLayerContext> ctxFactory) : base(ctxFactory)
        {
        }

        #endregion Public Constructors

        #region Public Methods

        /// <inheritdoc />
        public async Task<bool> AddAsync(JobTaskModel entity)
        {
            await using var dbCtx = await CreateContextAsync();
            await dbCtx.DbSetJobTask.AddAsync(entity);
            return await dbCtx.SaveChangesAsync() > 0;
        }

        /// <inheritdoc />
        public async Task<bool> DeleteAsync(JobTaskModel rec2del)
        {
            // Add validation for null entity
            if (rec2del == null) return false;

            await using var dbCtx = await CreateContextAsync();

            // Wrap in transaction for atomicity (multi-row update + delete)
            await using var tx = await dbCtx.Database.BeginTransactionAsync();
            try
            {
                var dbResult = await dbCtx.DbSetJobTask
                    .FirstOrDefaultAsync(x => x.JobID == rec2del.JobID);

                if (dbResult == null)
                    return false;

                var list2Move = await dbCtx.DbSetJobTask
                                        .Where(x => x.JobID == rec2del.JobID && x.Index > dbResult.Index)
                                        .ToListAsync();

                foreach (var item in list2Move)
                {
                    item.Index--;
                    dbCtx.Entry(item).State = EntityState.Modified;
                }

                dbCtx.DbSetJobTask.Remove(dbResult);

                bool done = await dbCtx.SaveChangesAsync() > 0;

                if (done)
                    await tx.CommitAsync();

                return done;
            }
            catch
            {
                await tx.RollbackAsync();
                throw;
            }
        }

        /// <inheritdoc />
        public async Task<List<JobTaskModel>> GetAllAsync()
        {
            await using var dbCtx = await CreateContextAsync();
            return await dbCtx.DbSetJobTask
                            .Include(c => c.TagNav)
                            .Include(c => c.JobStepNav)
                            .AsNoTracking()
                            .ToListAsync();
        }

        /// <inheritdoc />
        public async Task<JobTaskModel?> GetByIdAsync(int recId)
        {
            await using var dbCtx = await CreateContextAsync();
            return await dbCtx.DbSetJobTask.FirstOrDefaultAsync(x => x.JobID == recId);
        }

        /// <inheritdoc />
        public async Task<bool> MergeTagsAsync(int JobID, List<string> reqTagList)
        {
            await using var dbCtx = await CreateContextAsync();

            // Wrap in transaction for atomicity (multi-row add + multi-row remove)
            await using var tx = await dbCtx.Database.BeginTransactionAsync();
            try
            {
                var currRec = await dbCtx.DbSetJobTask
                                        .Where(x => x.JobID == JobID)
                                        .Include(t => t.TagNav)
                                        .FirstOrDefaultAsync();

                if (currRec == null)
                    return false;

                var currentTags = currRec.TagNav.Select(t => t.CodTag).ToList();

                // calcolo modifiche
                var toAdd = reqTagList.Except(currentTags).ToList();
                var toRemove = currentTags.Except(reqTagList).ToList();

                // aggiunte
                foreach (var tag in toAdd)
                {
                    currRec.TagNav.Add(new JobTaskTagModel
                    {
                        JobID = JobID,
                        CodTag = tag
                    });
                }
                // rimozioni
                foreach (var tag in toRemove)
                {
                    var entity = currRec.TagNav.FirstOrDefault(t => t.CodTag == tag);
                    if (entity != null)
                        dbCtx.Remove(entity);
                }

                dbCtx.Entry(currRec).State = EntityState.Modified;

                bool done = await dbCtx.SaveChangesAsync() > 0;

                if (done)
                    await tx.CommitAsync();

                return done;
            }
            catch
            {
                await tx.RollbackAsync();
                throw;
            }
        }

        /// <inheritdoc />
        public async Task<bool> MoveAsync(JobTaskModel selRec, bool moveUp)
        {
            // Add validation for null entity
            if (selRec == null) return false;

            await using var dbCtx = await CreateContextAsync();

            // Wrap in transaction for atomicity (multi-row update)
            await using var tx = await dbCtx.Database.BeginTransactionAsync();
            try
            {
                var currRec = await dbCtx.DbSetJobTask
                    .FirstOrDefaultAsync(x => x.JobID == selRec.JobID);

                if (currRec == null)
                    return false;

                int numRec = await dbCtx.DbSetJobTask
                                        .CountAsync();

                int newPos = moveUp ? currRec.Index - 1 : currRec.Index + 1;

                bool canMove = moveUp ? newPos > 0 : newPos <= numRec;
                if (!canMove)
                    return false;

                var otherRec = await dbCtx.DbSetJobTask
                    .FirstOrDefaultAsync(x => x.JobID == selRec.JobID && x.Index == newPos);

                if (otherRec == null)
                    return false;

                otherRec.Index = currRec.Index;
                currRec.Index = newPos;

                dbCtx.Entry(otherRec).State = EntityState.Modified;
                dbCtx.Entry(currRec).State = EntityState.Modified;

                bool done = await dbCtx.SaveChangesAsync() > 0;

                if (done)
                    await tx.CommitAsync();

                return done;
            }
            catch
            {
                await tx.RollbackAsync();
                throw;
            }
        }

        /// <inheritdoc />
        public async Task<bool> UpdateAsync(JobTaskModel entity)
        {
            await using var dbCtx = await CreateContextAsync();
            var trackedEntity = await dbCtx.DbSetJobTask.FirstOrDefaultAsync(x => x.JobID == entity.JobID);

            if (trackedEntity != null)
            {
                dbCtx.Entry(trackedEntity).CurrentValues.SetValues(entity);
            }
            else
            {
                dbCtx.DbSetJobTask.Update(entity);
            }
            return await dbCtx.SaveChangesAsync() > 0;
        }

        #endregion Public Methods
    }
}