using Microsoft.EntityFrameworkCore.Storage;

namespace GamificationService.Database.Repositories;

public class UnitOfWork : IDisposable
{
    #region  fields
    
    private ApplicationContext _context;
    
    #endregion
    
    
    private IDbContextTransaction _transaction;
    
    public UnitOfWork(ApplicationContext context)
    {
        _context = context;
    }


    #region Properties

    #endregion

    public bool Save()
    {
       return _context.SaveChanges() > 0;
    }

    public async Task<bool> SaveAsync()
    {
       return await _context.SaveChangesAsync() > 0;
    }

    
    private bool disposed = false;

    protected virtual void Dispose(bool disposing)
    {
        if (!this.disposed)
        {
            if (disposing)
            {
                _context.Dispose();
            }
        }
        this.disposed = true;
    }
    public async Task BeginTransactionAsync()
    {
        if (_transaction is not null)
            throw new InvalidOperationException("A transaction has already been started.");
        _transaction = await _context.Database.BeginTransactionAsync();
    }
    public async Task CommitAsync()
    {
        if (_transaction is null)
            throw new InvalidOperationException("A transaction has not been started.");
    
        try
        {
            await _transaction.CommitAsync();
            _transaction.Dispose();
            _transaction = null;
        }
        catch (Exception)
        {
            if (_transaction is not null)
                await _transaction.RollbackAsync();
            throw;
        }
    }
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}