using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using MotoresArgentinosV2.Infrastructure.Data;
using MotoresArgentinosV2.Core.Entities;
using MotoresArgentinosV2.Infrastructure.Services;
using MotoresArgentinosV2.Core.Interfaces;
using MotoresArgentinosV2.Core.DTOs;
using Microsoft.AspNetCore.Authorization;

namespace MotoresArgentinosV2.API.Controllers;

[ApiController]
[Route("api/[controller]")]
public class AdsV2Controller : ControllerBase
{
    private readonly MotoresV2DbContext _context;
    private readonly IImageStorageService _imageService;
    private readonly IIdentityService _identityService;

    public AdsV2Controller(MotoresV2DbContext context, IImageStorageService imageService, IIdentityService identityService)
    {
        _context = context;
        _imageService = imageService;
        _identityService = identityService;
    }

    private int GetCurrentUserId()
    {
        return int.Parse(User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value ?? "0");
    }

    private bool IsUserAdmin()
    {
        return User.IsInRole("Admin");
    }

    [HttpGet]
    public async Task<IActionResult> GetAll(
        [FromQuery] string? q,
        [FromQuery] string? c,
        [FromQuery] int? minPrice,
        [FromQuery] int? maxPrice,
        [FromQuery] string? currency,
        [FromQuery] int? minYear,
        [FromQuery] int? maxYear,
        [FromQuery] int? userId,
        [FromQuery] int? brandId,
        [FromQuery] int? modelId,
        [FromQuery] string? fuel,
        [FromQuery] string? transmission,
        [FromQuery] string? color,
        [FromQuery] bool? isFeatured)
    {
        var query = _context.Ads
            .Include(a => a.Photos)
            .Include(a => a.Features)
            .Include(a => a.Brand)
            .Include(a => a.Model)
            .AsQueryable();

        if (isFeatured.HasValue) query = query.Where(a => a.IsFeatured == isFeatured.Value);

        if (brandId.HasValue) query = query.Where(a => a.BrandID == brandId.Value);
        if (modelId.HasValue) query = query.Where(a => a.ModelID == modelId.Value);

        if (!string.IsNullOrEmpty(currency))
        {
            query = query.Where(a => a.Currency == currency);
        }

        if (minPrice.HasValue) query = query.Where(a => a.Price >= minPrice.Value);
        if (maxPrice.HasValue) query = query.Where(a => a.Price <= maxPrice.Value);

        if (!string.IsNullOrEmpty(fuel))
            query = query.Where(a => a.FuelType == fuel || a.Features.Any(f => f.FeatureKey == "Combustible" && f.FeatureValue == fuel));

        if (!string.IsNullOrEmpty(transmission))
            query = query.Where(a => a.Transmission == transmission || a.Features.Any(f => f.FeatureKey == "Transmision" && f.FeatureValue == transmission));

        if (!string.IsNullOrEmpty(color))
            query = query.Where(a => a.Color == color || a.Features.Any(f => f.FeatureKey == "Color" && f.FeatureValue == color));

        if (!string.IsNullOrEmpty(Request.Query["segment"]))
        {
            var segment = Request.Query["segment"].ToString();
            query = query.Where(a => a.Segment == segment);
        }
        if (!string.IsNullOrEmpty(Request.Query["location"]))
        {
            var loc = Request.Query["location"].ToString();
            query = query.Where(a => a.Location != null && a.Location.Contains(loc));
        }
        if (!string.IsNullOrEmpty(Request.Query["condition"]))
        {
            var cond = Request.Query["condition"].ToString();
            query = query.Where(a => a.Condition == cond);
        }

        if (!string.IsNullOrEmpty(Request.Query["steering"]))
        {
            var st = Request.Query["steering"].ToString();
            query = query.Where(a => a.Steering == st);
        }

        if (int.TryParse(Request.Query["doorCount"], out int dc))
        {
            query = query.Where(a => a.DoorCount == dc);
        }

        if (!userId.HasValue)
        {
            var publicStatuses = new[] {
                (int)AdStatusEnum.Active,
                (int)AdStatusEnum.Sold,
                (int)AdStatusEnum.Reserved
            };
            query = query.Where(a => publicStatuses.Contains(a.StatusID));
        }
        else
        {
            query = query.Where(a => a.UserID == userId.Value);
        }

        // --- LÓGICA DE BÚSQUEDA POR PALABRAS ---
        if (!string.IsNullOrEmpty(q))
        {
            // 1. Dividimos el término de búsqueda en palabras individuales.
            var keywords = q.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

            // 2. Por cada palabra, agregamos una condición 'Where'.
            //    Esto crea un AND implícito: el aviso debe coincidir con TODAS las palabras.
            foreach (var keyword in keywords)
            {
                var lowerKeyword = keyword.ToLower();
                query = query.Where(a =>
                    (a.Brand != null && a.Brand.Name.ToLower().Contains(lowerKeyword)) ||
                    (a.Model != null && a.Model.Name.ToLower().Contains(lowerKeyword)) ||
                    (a.VersionName != null && a.VersionName.ToLower().Contains(lowerKeyword))
                );
            }
        }

        if (!string.IsNullOrEmpty(c))
        {
            int typeId = c == "EAUTOS" ? 1 : (c == "EMOTOS" ? 2 : 0);
            if (typeId > 0) query = query.Where(a => a.VehicleTypeID == typeId);
        }

        if (minPrice.HasValue) query = query.Where(a => a.Price >= minPrice.Value);
        if (maxPrice.HasValue) query = query.Where(a => a.Price <= maxPrice.Value);
        if (minYear.HasValue) query = query.Where(a => a.Year >= minYear.Value);
        if (maxYear.HasValue) query = query.Where(a => a.Year <= maxYear.Value);

        var results = await query.OrderByDescending(a => a.IsFeatured)
                                 .ThenByDescending(a => a.CreatedAt)
                                 .Select(a => new
                                 {
                                     id = a.AdID,
                                     brandName = a.Brand != null ? a.Brand.Name : null,
                                     versionName = a.VersionName,
                                     price = a.Price,
                                     currency = a.Currency,
                                     year = a.Year,
                                     km = a.KM,
                                     image = a.Photos.OrderBy(p => p.SortOrder).Select(p => p.FilePath).FirstOrDefault(),
                                     isFeatured = a.IsFeatured,
                                     statusId = a.StatusID,
                                     viewsCounter = a.ViewsCounter,

                                     createdAt = a.CreatedAt,
                                     location = a.Location,
                                     fuelType = a.FuelType,
                                     color = a.Color,
                                     segment = a.Segment,
                                     condition = a.Condition,
                                     doorCount = a.DoorCount,
                                     transmission = a.Transmission,
                                     steering = a.Steering
                                 })
                                 .ToListAsync();

        return Ok(results);
    }

    [HttpGet("search-suggestions")]
    public async Task<IActionResult> GetSearchSuggestions([FromQuery] string term)
    {
        if (string.IsNullOrEmpty(term) || term.Length < 2)
        {
            return Ok(new List<string>());
        }

        // Buscar en Marcas
        var brands = await _context.Brands
            .Where(b => b.Name.Contains(term))
            .Select(b => b.Name)
            .ToListAsync();

        // Buscar en Modelos
        var models = await _context.Models
            .Where(m => m.Name.Contains(term))
            .Select(m => m.Name)
            .ToListAsync();

        // Combinar, eliminar duplicados y tomar los primeros 5
        var suggestions = brands.Concat(models)
                                .Distinct()
                                .OrderBy(s => s)
                                .Take(5)
                                .ToList();

        return Ok(suggestions);
    }

    [HttpGet("{id}")]
    public async Task<IActionResult> GetById(int id)
    {
        var ad = await _context.Ads
            .Include(a => a.Photos)
            .Include(a => a.Features)
            .Include(a => a.Brand)
            .Include(a => a.Model)
            .Include(a => a.User)
            .FirstOrDefaultAsync(a => a.AdID == id);

        if (ad == null) return NotFound();

        // 1. SEGURIDAD Y CONTROL DE ACCESO
        // Obtenemos datos del usuario actual
        var userIdStr = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
        int currentUserId = int.TryParse(userIdStr, out int uid) ? uid : 0;
        bool isAdmin = User.IsInRole("Admin");
        bool isOwner = ad.UserID == currentUserId;

        // Definimos qué estados son visibles para todo el mundo
        var publicStatuses = new[] {
            (int)AdStatusEnum.Active,
            (int)AdStatusEnum.Reserved,
            (int)AdStatusEnum.Sold
        };

        bool isPublic = publicStatuses.Contains(ad.StatusID);

        // REGLA A: Si está ELIMINADO (9), nadie lo ve por URL pública (solo admin podría en dashboard)
        if (ad.StatusID == (int)AdStatusEnum.Deleted && !isAdmin)
        {
            return NotFound();
        }

        // REGLA B: Si NO es público (ej: Vencido, Borrador, Pausado) y NO es dueño ni admin -> 404
        if (!isPublic && !isOwner && !isAdmin)
        {
            return NotFound();
        }

        // 2. LÓGICA DE CONTEO
        try
        {
            // REGLA: Solo contamos si NO es el dueño (isOwner ya calculado arriba)
            if (!isOwner)
            {
                var userIp = HttpContext.Connection.RemoteIpAddress?.ToString() ?? "0.0.0.0";
                var cutoffDate = DateTime.UtcNow.AddHours(-24);

                // Verificamos si esta IP ya vio este aviso en las últimas 24hs
                var alreadyViewed = await _context.AdViewLogs
                    .AnyAsync(v => v.AdID == id && v.IPAddress == userIp && v.ViewDate > cutoffDate);

                if (!alreadyViewed)
                {
                    // A. Registrar Log
                    _context.AdViewLogs.Add(new AdViewLog
                    {
                        AdID = id,
                        IPAddress = userIp,
                        ViewDate = DateTime.UtcNow
                    });

                    // B. Incrementar Contador
                    await _context.Ads
                        .Where(a => a.AdID == id)
                        .ExecuteUpdateAsync(s => s.SetProperty(a => a.ViewsCounter, a => a.ViewsCounter + 1));

                    await _context.SaveChangesAsync();
                }
            }
        }
        catch (Exception)
        {
            // Ignoramos errores de conteo para no bloquear la visualización
        }

        // 3. RESPUESTA
        return Ok(new
        {
            adID = ad.AdID,
            userID = ad.UserID,
            ownerUserType = ad.User?.UserType,
            vehicleTypeID = ad.VehicleTypeID,
            brandID = ad.BrandID,
            modelID = ad.ModelID,
            versionName = ad.VersionName,
            brandName = ad.Brand?.Name,

            year = ad.Year,
            km = ad.KM,
            price = ad.Price,
            currency = ad.Currency,
            description = ad.Description,
            isFeatured = ad.IsFeatured,
            statusID = ad.StatusID,
            createdAt = ad.CreatedAt,
            publishedAt = ad.PublishedAt,
            expiresAt = ad.ExpiresAt,
            legacyAdID = ad.LegacyAdID,
            viewsCounter = ad.ViewsCounter,
            fuelType = ad.FuelType,
            color = ad.Color,
            segment = ad.Segment,
            location = ad.Location,
            condition = ad.Condition,
            doorCount = ad.DoorCount,
            transmission = ad.Transmission,
            steering = ad.Steering,
            contactPhone = ad.ContactPhone,
            contactEmail = ad.ContactEmail,
            displayContactInfo = ad.DisplayContactInfo,
            photos = ad.Photos.Select(p => new { p.PhotoID, p.FilePath, p.IsCover, p.SortOrder }),
            features = ad.Features.Select(f => new { f.FeatureKey, f.FeatureValue }),
            brand = ad.Brand != null ? new { id = ad.Brand.BrandID, name = ad.Brand.Name } : null,
            model = ad.Model != null ? new { id = ad.Model.ModelID, name = ad.Model.Name } : null
        });
    }

    [HttpPost]
    public async Task<IActionResult> Create([FromBody] CreateAdRequestDto request)
    {
        var currentUserId = int.Parse(User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value ?? "0");
        var userRole = User.FindFirst(System.Security.Claims.ClaimTypes.Role)?.Value;
        bool isAdmin = userRole == "Admin";

        int finalUserId = currentUserId;

        if (isAdmin)
        {
            if (request.TargetUserID.HasValue)
            {
                finalUserId = request.TargetUserID.Value;
            }
            else if (!string.IsNullOrEmpty(request.GhostUserEmail))
            {
                // Pasamos nombre y apellido por separado
                var ghost = await _identityService.CreateGhostUserAsync(
                    request.GhostUserEmail,
                    request.GhostFirstName ?? "Usuario",
                    request.GhostLastName ?? "",
                    request.GhostUserPhone ?? ""
                );
                finalUserId = ghost.UserID;
            }
        }

        // 🟢 LÓGICA DE MODELO DINÁMICO
        int finalModelId = request.ModelID;

        // Si el front manda 0 (modelo nuevo escrito a mano)
        if (finalModelId == 0 && !string.IsNullOrEmpty(request.VersionName))
        {
            // Intentamos extraer el nombre del modelo desde el VersionName
            var brand = await _context.Brands.FindAsync(request.BrandID);
            string modelNameCandidate = request.VersionName;

            // Si el nombre de versión empieza con la marca (ej: "Fiat 600"), quitamos la marca
            if (brand != null && modelNameCandidate.StartsWith(brand.Name, StringComparison.OrdinalIgnoreCase))
            {
                modelNameCandidate = modelNameCandidate.Substring(brand.Name.Length).Trim();
            }

            // Si quedó vacío o es muy genérico, usar un default
            if (string.IsNullOrWhiteSpace(modelNameCandidate)) modelNameCandidate = "Modelo Desconocido";

            // Opcional: Tomar solo la primera palabra como nombre del modelo para agrupar mejor
            // var firstWord = modelNameCandidate.Split(' ')[0];
            // if (firstWord.Length > 2) modelNameCandidate = firstWord;

            // Buscar si ya existe este modelo para esta marca
            var existingModel = await _context.Models
                .FirstOrDefaultAsync(m => m.BrandID == request.BrandID && m.Name == modelNameCandidate);

            if (existingModel != null)
            {
                finalModelId = existingModel.ModelID;
            }
            else
            {
                // Crear Nuevo Modelo
                var newModel = new Model
                {
                    BrandID = request.BrandID,
                    Name = modelNameCandidate
                };
                _context.Models.Add(newModel);
                await _context.SaveChangesAsync(); // Guardar para obtener ID
                finalModelId = newModel.ModelID;
            }
        }

        var ad = new Ad
        {
            UserID = finalUserId,
            VehicleTypeID = request.VehicleTypeID,
            BrandID = request.BrandID,
            ModelID = finalModelId, // Usamos el ID resuelto
            VersionName = request.VersionName,
            Year = request.Year,
            KM = request.KM,
            Price = request.Price,
            Currency = request.Currency,
            Description = request.Description,
            IsFeatured = request.IsFeatured,

            FuelType = request.FuelType,
            Color = request.Color,
            Segment = request.Segment,
            Location = request.Location,
            Condition = request.Condition,
            DoorCount = request.DoorCount,
            Transmission = request.Transmission,
            Steering = request.Steering,

            ContactPhone = request.ContactPhone,
            ContactEmail = request.ContactEmail,
            DisplayContactInfo = request.DisplayContactInfo,

            CreatedAt = DateTime.UtcNow
        };

        if (isAdmin)
        {
            ad.StatusID = (int)AdStatusEnum.Active;
            ad.PublishedAt = DateTime.UtcNow;
            ad.ExpiresAt = DateTime.UtcNow.AddDays(30);
        }
        else
        {
            ad.StatusID = (int)AdStatusEnum.Draft;
        }

        _context.Ads.Add(ad);
        await _context.SaveChangesAsync();

        // 📝 AUDITORÍA
        var brandName = (await _context.Brands.FindAsync(ad.BrandID))?.Name ?? "";
        _context.AuditLogs.Add(new AuditLog
        {
            Action = "AD_CREATED",
            Entity = "Ad",
            EntityID = ad.AdID,
            UserID = currentUserId,
            Details = $"Aviso '{brandName} {ad.VersionName}' creado. Estado inicial: {ad.StatusID}"
        });
        await _context.SaveChangesAsync();

        return CreatedAtAction(nameof(GetById), new { id = ad.AdID }, ad);
    }

    [HttpGet("brands/{vehicleTypeId}")]
    public async Task<IActionResult> GetBrands(int vehicleTypeId)
    {
        var brands = await _context.Set<Brand>()
            .Where(b => b.VehicleTypeID == vehicleTypeId)
            .Select(b => new { id = b.BrandID, name = b.Name })
            .ToListAsync();
        return Ok(brands);
    }

    [HttpGet("models/{brandId}")]
    public async Task<IActionResult> GetModels(int brandId)
    {
        var models = await _context.Set<Model>()
            .Where(m => m.BrandID == brandId)
            .Select(m => new { id = m.ModelID, name = m.Name })
            .ToListAsync();
        return Ok(models);
    }

    [HttpGet("models/search")]
    public async Task<IActionResult> SearchModels([FromQuery] int brandId, [FromQuery] string query)
    {
        if (string.IsNullOrEmpty(query) || query.Length < 2) return Ok(new List<object>());

        var models = await _context.Models
            .Where(m => m.BrandID == brandId && m.Name.Contains(query))
            .OrderBy(m => m.Name)
            .Take(20)
            .Select(m => new { id = m.ModelID, name = m.Name })
            .ToListAsync();

        return Ok(models);
    }

    [HttpPost("{id}/upload-photos")]
    public async Task<IActionResult> UploadPhotos(int id, [FromForm] IFormFileCollection files)
    {
        if (files == null || files.Count == 0) return BadRequest("No se recibieron archivos en la petición.");

        var ad = await _context.Ads.Include(a => a.Photos).FirstOrDefaultAsync(a => a.AdID == id);
        if (ad == null) return NotFound("Aviso no encontrado.");

        // 🛡️ SEGURIDAD: Verificar propiedad o ser admin
        var currentUserId = GetCurrentUserId();
        if (ad.UserID != currentUserId && !IsUserAdmin()) return Forbid();

        int currentCount = ad.Photos.Count;
        int availableSlots = 5 - currentCount;

        if (availableSlots <= 0)
        {
            return BadRequest($"Límite de 5 fotos alcanzado. Espacios disponibles: 0. Fotos actuales: {currentCount}");
        }

        var filesToProcess = files.Take(availableSlots).ToList();
        var uploadedCount = 0;
        var errors = new List<string>();

        foreach (var file in filesToProcess)
        {
            if (file.Length > 0)
            {
                try
                {
                    var relativePath = await _imageService.SaveAdImageAsync(id, file);

                    _context.AdPhotos.Add(new AdPhoto
                    {
                        AdID = id,
                        FilePath = relativePath,
                        IsCover = !_context.AdPhotos.Any(p => p.AdID == id) && uploadedCount == 0,
                        SortOrder = currentCount + uploadedCount
                    });

                    uploadedCount++;
                }
                catch (Exception ex)
                {
                    errors.Add($"{file.FileName}: {ex.Message}");
                }
            }
        }

        if (uploadedCount > 0)
        {
            await _context.SaveChangesAsync();
            return Ok(new
            {
                message = $"{uploadedCount} fotos procesadas.",
                errors = errors.Any() ? errors : null
            });
        }

        return BadRequest(new
        {
            message = "No se pudieron procesar las imágenes.",
            details = errors
        });
    }

    [HttpDelete("photos/{photoId}")]
    public async Task<IActionResult> DeletePhoto(int photoId)
    {
        var photo = await _context.AdPhotos.Include(p => p.Ad).FirstOrDefaultAsync(p => p.PhotoID == photoId);
        if (photo == null) return NotFound();

        // 🛡️ SEGURIDAD: Verificar propiedad o ser admin
        var currentUserId = GetCurrentUserId();
        if (photo.Ad.UserID != currentUserId && !IsUserAdmin()) return Forbid();

        // Eliminar del disco
        _imageService.DeleteAdImage(photo.FilePath);

        // Eliminar de la base de datos
        _context.AdPhotos.Remove(photo);
        await _context.SaveChangesAsync();

        return NoContent();
    }

    [HttpPut("{id}")]
    [Authorize]
    public async Task<IActionResult> Update(int id, [FromBody] CreateAdRequestDto updatedAdDto)
    {
        var ad = await _context.Ads.FindAsync(id);
        if (ad == null) return NotFound();

        var userId = GetCurrentUserId();

        if (ad.UserID != userId && !IsUserAdmin())
        {
            return Forbid();
        }

        // Si está en moderación, no se puede editar (salvo Admin)
        if (!IsUserAdmin() && ad.StatusID == (int)AdStatusEnum.ModerationPending)
        {
            return BadRequest("No puedes editar un aviso que está en proceso de revisión.");
        }

        // --- Lógica de Modelo Dinámico (Si edita a un modelo nuevo) ---
        int finalModelId = updatedAdDto.ModelID;
        if (finalModelId == 0 && !string.IsNullOrEmpty(updatedAdDto.VersionName))
        {
            var brand = await _context.Brands.FindAsync(updatedAdDto.BrandID);
            string modelNameCandidate = updatedAdDto.VersionName;
            if (brand != null && modelNameCandidate.StartsWith(brand.Name, StringComparison.OrdinalIgnoreCase))
            {
                modelNameCandidate = modelNameCandidate.Substring(brand.Name.Length).Trim();
            }
            if (string.IsNullOrWhiteSpace(modelNameCandidate)) modelNameCandidate = "Modelo Desconocido";

            var existingModel = await _context.Models
               .FirstOrDefaultAsync(m => m.BrandID == updatedAdDto.BrandID && m.Name == modelNameCandidate);

            if (existingModel != null)
            {
                finalModelId = existingModel.ModelID;
            }
            else
            {
                var newModel = new Model { BrandID = updatedAdDto.BrandID, Name = modelNameCandidate };
                _context.Models.Add(newModel);
                await _context.SaveChangesAsync();
                finalModelId = newModel.ModelID;
            }
        }

        // --- Mapeo manual desde el DTO a la Entidad ---
        ad.BrandID = updatedAdDto.BrandID;
        ad.ModelID = finalModelId; // Usar el ID resuelto
        ad.VersionName = updatedAdDto.VersionName;
        ad.Year = updatedAdDto.Year;
        ad.KM = updatedAdDto.KM;
        ad.Price = updatedAdDto.Price;
        ad.Currency = updatedAdDto.Currency;
        ad.Description = updatedAdDto.Description;

        ad.FuelType = updatedAdDto.FuelType;
        ad.Color = updatedAdDto.Color;
        ad.Segment = updatedAdDto.Segment;
        ad.Location = updatedAdDto.Location;
        ad.Condition = updatedAdDto.Condition;
        ad.DoorCount = updatedAdDto.DoorCount;
        ad.Transmission = updatedAdDto.Transmission;
        ad.Steering = updatedAdDto.Steering;
        ad.ContactPhone = updatedAdDto.ContactPhone;
        ad.ContactEmail = updatedAdDto.ContactEmail;
        ad.DisplayContactInfo = updatedAdDto.DisplayContactInfo;
        // Nota: IsFeatured y otros campos sensibles se manejan por separado (pago/admin)

        // 📝 AUDITORÍA
        var adBrandName = (await _context.Brands.FindAsync(ad.BrandID))?.Name ?? "";
        _context.AuditLogs.Add(new AuditLog
        {
            Action = "AD_UPDATED",
            Entity = "Ad",
            EntityID = ad.AdID,
            UserID = userId,
            Details = $"Aviso ID {ad.AdID} ({adBrandName} {ad.VersionName}) actualizado por el propietario/admin."
        });

        await _context.SaveChangesAsync();
        return Ok(ad);
    }

    [HttpDelete("{id}")]
    [Authorize]
    public async Task<IActionResult> Delete(int id)
    {
        var ad = await _context.Ads.FindAsync(id);
        if (ad == null) return NotFound();

        var userId = GetCurrentUserId();

        if (ad.UserID != userId && !IsUserAdmin())
        {
            return Forbid();
        }

        ad.StatusID = (int)AdStatusEnum.Deleted;
        ad.DeletedAt = DateTime.UtcNow;

        // 📝 AUDITORÍA
        var delBrandName = (await _context.Brands.FindAsync(ad.BrandID))?.Name ?? "";
        _context.AuditLogs.Add(new AuditLog
        {
            Action = "AD_DELETED_SOFT",
            Entity = "Ad",
            EntityID = ad.AdID,
            UserID = userId,
            Details = $"Aviso ID {ad.AdID} ({delBrandName} {ad.VersionName}) marcado como eliminado (borrado lógico)."
        });

        await _context.SaveChangesAsync();
        return NoContent();
    }

    [HttpPost("favorites")]
    public async Task<IActionResult> AddFavorite([FromBody] Favorite fav)
    {
        if (await _context.Favorites.AnyAsync(f => f.UserID == fav.UserID && f.AdID == fav.AdID))
            return BadRequest("Ya es favorito");

        _context.Favorites.Add(fav);
        await _context.SaveChangesAsync();
        return Ok();
    }

    [HttpDelete("favorites")]
    public async Task<IActionResult> RemoveFavorite([FromQuery] int userId, [FromQuery] int adId)
    {
        var fav = await _context.Favorites.FindAsync(userId, adId);
        if (fav == null) return NotFound();

        _context.Favorites.Remove(fav);
        await _context.SaveChangesAsync();
        return NoContent();
    }

    [HttpGet("favorites/{userId}")]
    public async Task<IActionResult> GetFavorites(int userId)
    {
        var ads = await _context.Favorites
            .Where(f => f.UserID == userId)
            .Join(_context.Ads, f => f.AdID, a => a.AdID, (f, a) => a)
            .Include(a => a.Photos)
            .Select(a => new
            {
                id = a.AdID,
                BrandName = a.Brand != null ? a.Brand.Name : null,
                VersionName = a.VersionName,
                price = a.Price,
                currency = a.Currency,
                year = a.Year,
                km = a.KM,
                image = a.Photos.OrderBy(p => p.SortOrder).Select(p => p.FilePath).FirstOrDefault()
            })
            .ToListAsync();

        return Ok(ads);
    }

    [HttpPatch("{id}/status")]
    public async Task<IActionResult> ChangeStatus(int id, [FromBody] int newStatus)
    {
        var ad = await _context.Ads.FindAsync(id);
        if (ad == null) return NotFound();

        var userId = int.Parse(User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value ?? "0");
        var userRole = User.FindFirst(System.Security.Claims.ClaimTypes.Role)?.Value;
        bool isAdmin = userRole == "Admin";

        if (ad.UserID != userId && !isAdmin) return Forbid();

        // 🛡️ VALIDACIONES DE ESTADO
        if (!isAdmin)
        {
            // 1. No activar borradores sin pagar
            if (ad.StatusID == (int)AdStatusEnum.Draft || ad.StatusID == (int)AdStatusEnum.PaymentPending)
            {
                return BadRequest("Debes completar el pago para activar este aviso.");
            }

            // 2. NUEVO: No tocar si está en moderación
            if (ad.StatusID == (int)AdStatusEnum.ModerationPending)
            {
                return BadRequest("El aviso está en revisión. Espera la aprobación del administrador.");
            }
        }

        // Validar estados destino permitidos para el usuario
        var allowedUserStatuses = new[] { 4, 6, 7, 9, 10 };
        if (!isAdmin && !allowedUserStatuses.Contains(newStatus))
        {
            return BadRequest("Estado destino no permitido.");
        }

        int oldStatus = ad.StatusID;
        ad.StatusID = newStatus;

        // 📝 AUDITORÍA
        var statusBrandName = (await _context.Brands.FindAsync(ad.BrandID))?.Name ?? "";
        _context.AuditLogs.Add(new AuditLog
        {
            Action = "AD_STATUS_CHANGED",
            Entity = "Ad",
            EntityID = ad.AdID,
            UserID = userId,
            Details = $"Estado de aviso ({statusBrandName} {ad.VersionName}) cambiado de {oldStatus} a {newStatus}."
        });

        await _context.SaveChangesAsync();

        return Ok(new { message = "Estado actualizado" });
    }

    [HttpGet("payment-methods")]
    public async Task<IActionResult> GetPaymentMethods()
    {
        var methods = await _context.PaymentMethods
            .OrderBy(p => p.PaymentMethodID)
            .Select(p => new { id = p.PaymentMethodID, mediodepago = p.Name })
            .ToListAsync();

        return Ok(methods);
    }
}