using DbFirst.Domain.Repositories;
using DbFirst.Domain.Entities;
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using System.Data;

namespace DbFirst.Infrastructure.Repositories;

public class CatalogRepository : ICatalogRepository
{
    private readonly ApplicationDbContext _db;

    public CatalogRepository(ApplicationDbContext db)
    {
        _db = db;
    }

    public async Task<List<VwmyCatalog>> GetAllAsync(CancellationToken cancellationToken = default)
    {
        return await _db.VwmyCatalogs.AsNoTracking().ToListAsync(cancellationToken);
    }

    public async Task<VwmyCatalog?> GetByIdAsync(int id, CancellationToken cancellationToken = default)
    {
        return await _db.VwmyCatalogs.AsNoTracking().FirstOrDefaultAsync(x => x.Guid == id, cancellationToken);
    }

    public async Task<VwmyCatalog> InsertAsync(VwmyCatalog catalog, CancellationToken cancellationToken = default)
    {
        // Platzhalter: Insert-Prozedur folgt.
        // TODO: Replace with dedicated insert stored procedure invocation.
        throw new NotImplementedException("Insert stored procedure not implemented yet.");
    }

    public async Task<VwmyCatalog?> UpdateAsync(int id, VwmyCatalog catalog, CancellationToken cancellationToken = default)
    {
        var exists = await _db.VwmyCatalogs.AsNoTracking().AnyAsync(x => x.Guid == id, cancellationToken);
        if (!exists)
        {
            return null;
        }

        catalog.Guid = id;

        var guidParam = new SqlParameter("@GUID", SqlDbType.Int)
        {
            Direction = ParameterDirection.InputOutput,
            Value = catalog.Guid == 0 ? DBNull.Value : catalog.Guid
        };

        var catTitleParam = new SqlParameter("@CAT_TITLE", catalog.CatTitle);
        var catStringParam = new SqlParameter("@CAT_STRING", catalog.CatString);
        var changedWhoParam = new SqlParameter("@CHANGED_WHO", (object?)catalog.ChangedWho ?? DBNull.Value);

        await _db.Database.ExecuteSqlRawAsync(
            "EXEC dbo.PRTBMY_CATALOG_UPDATE @CAT_TITLE, @CAT_STRING, @CHANGED_WHO, @GUID OUTPUT",
            parameters: new[] { catTitleParam, catStringParam, changedWhoParam, guidParam },
            cancellationToken: cancellationToken);

        if (guidParam.Value == DBNull.Value)
        {
            return null;
        }

        var guid = (int)guidParam.Value;
        return await _db.VwmyCatalogs.AsNoTracking().FirstOrDefaultAsync(x => x.Guid == guid, cancellationToken);
    }

    public async Task<bool> DeleteAsync(int id, CancellationToken cancellationToken = default)
    {
        var exists = await _db.VwmyCatalogs.AsNoTracking().AnyAsync(x => x.Guid == id, cancellationToken);
        if (!exists)
        {
            return false;
        }

        var guidParam = new SqlParameter("@GUID", id);
        await _db.Database.ExecuteSqlRawAsync(
            "EXEC dbo.PRTBMY_CATALOG_DELETE @GUID",
            parameters: new[] { guidParam },
            cancellationToken: cancellationToken);

        return true;
    }
}