#if NET48
using System.Data.Entity;
#else
using Microsoft.EntityFrameworkCore;
#endif
using ECMJobRunner.Application.Common.Interfaces;
using ECMJobRunner.Infrastructure.Data;
using System.Threading;
using System.Threading.Tasks;
using System.Linq;

namespace ECMJobRunner.Infrastructure.Services
{
    /// <summary>
    /// Entity Framework implementation of ISQLExecutor
    /// Executes raw SQL queries and maps results to DTOs
    /// </summary>
    public class SQLExecutor : ISQLExecutor
    {
        private readonly JobRunnerDbContext _context;

        /// <summary>
        /// Initializes a new instance of SQLExecutor
        /// </summary>
        /// <param name="context">The database context</param>
        public SQLExecutor(JobRunnerDbContext context)
        {
            _context = context;
        }

        /// <summary>
        /// Executes a SQL query and maps the result to the specified type
        /// </summary>
        /// <typeparam name="TResult">The type to map the query result to</typeparam>
        /// <param name="sql">The SQL query to execute</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>The mapped result or null if no result</returns>
        public async Task<TResult?> ExecuteQueryAsync<TResult>(string sql, CancellationToken cancellationToken = default)
        {
#if NET48
            // Entity Framework 6 implementation
            var result = await _context.Database
                .SqlQuery<TResult>(sql)
                .ToListAsync(cancellationToken);

            return result.FirstOrDefault();
#else
            // Entity Framework Core implementation
            var result = await _context.Database
                .SqlQueryRaw<TResult>(sql)
                .ToListAsync(cancellationToken);
            
            return result.FirstOrDefault();
#endif
        }
    }
}