package db

import (
	"encoding/json"
	"errors"
	"fmt"
	"gestion/models"
	"log"
	"slices"
	"strings"
	"time"

	"gorm.io/gorm"
)

// errAlreadyApproved est retournée quand le client tente d'approuver une commande déjà approuvée.
var errAlreadyApproved = errors.New("already_approved")

func sanitizeString(s string) string {
	sanitized := strings.Map(func(r rune) rune {
		if r < 32 || r == 127 {
			return -1
		}
		return r
	}, s)

	if len(sanitized) > 1000 {
		sanitized = sanitized[:1000]
	}

	return strings.TrimSpace(sanitized)
}

func validateAddress(address string) error {
	address = strings.TrimSpace(address)

	if address == "" {
		return fmt.Errorf("adresse vide non autorisée")
	}

	if len(address) > 500 {
		return fmt.Errorf("adresse trop longue (max 500 caractères)")
	}

	if strings.ContainsAny(address, "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x0E\x0F") {
		return fmt.Errorf("adresse contient des caractères de contrôle interdits")
	}

	return nil
}

type basketItem struct {
	ProductID     int     `gorm:"column:product_id"`
	Quantity      float64 `gorm:"column:quantity"`
	Price         float64 `gorm:"column:price"`
	IsReward      bool    `gorm:"column:is_reward"`
	RewardPoolKey string  `gorm:"column:reward_pool_key"`
}

// validateCommandStatus vérifie si le statut est valide
func validateCommandStatus(status string) error {
	validStatuses := map[string]bool{
		"pending":   true,
		"assigned":  true,
		"en_route":  true,
		"arrived":   true,
		"livre":     true,
		"approved":  true,
		"cancelled": true,
		"disabled":  true,
	}

	if !validStatuses[status] {
		return fmt.Errorf("statut invalide: %s", status)
	}

	return nil
}

func (d *Database) CreateCommandWithAddress(username, deliveryAddress string) (*models.Command, error) {
	if err := validateUsername(username); err != nil {
		return nil, err
	}

	if err := validateAddress(deliveryAddress); err != nil {
		return nil, err
	}

	client, err := d.GetClientByUsername(username)
	if err != nil {
		log.Printf("⚠️ Client non trouvé: %v", err)
	}

	clientNom := ""
	clientPrenom := ""
	clientTelephone := ""
	if client != nil {
		clientNom = sanitizeString(client.Nom)
		clientPrenom = sanitizeString(client.Prenom)
		clientTelephone = sanitizeString(client.Telephone)
	}

	var (
		command   *models.Command
		totalPrix float64
	)
	err = d.GDB.Transaction(func(tx *gorm.DB) error {
		// Verrou sur le panier : un double-submit concurrent du même client se
		// bloque ici puis échoue proprement ("panier vide") une fois le premier
		// passage terminé, au lieu de créer une commande fantôme.
		var basketItems []basketItem
		if err := tx.Raw(`SELECT product_id, quantity, price, is_reward, reward_pool_key FROM baskets WHERE username = ? FOR UPDATE`, username).Scan(&basketItems).Error; err != nil {
			return fmt.Errorf("erreur récupération panier: %w", err)
		}
		if len(basketItems) == 0 {
			return fmt.Errorf("le panier est vide")
		}

		for _, item := range basketItems {
			if item.ProductID <= 0 || item.Quantity <= 0 || item.Price < 0 {
				return fmt.Errorf("données panier invalides")
			}
			totalPrix += item.Price
		}

		if totalPrix <= 0 || totalPrix > 100000 {
			return fmt.Errorf("montant de commande invalide: %.2f€", totalPrix)
		}

		var cmdResult struct {
			ID            int       `gorm:"column:id"`
			ClientOrderID int       `gorm:"column:client_order_id"`
			CreatedAt     time.Time `gorm:"column:created_at"`
			UpdatedAt     time.Time `gorm:"column:updated_at"`
		}
		if err := tx.Raw(`
			INSERT INTO commandes (username, status, adresse, total_prix, client_order_id, created_at, updated_at)
			VALUES (?, ?, ?, ?, (SELECT COALESCE(MAX(client_order_id), 0) + 1 FROM commandes WHERE username = ?), CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
			RETURNING id, client_order_id, created_at, updated_at`,
			username, "pending", deliveryAddress, totalPrix, username).Scan(&cmdResult).Error; err != nil {
			return fmt.Errorf("erreur création commande: %w", err)
		}
		commandID := cmdResult.ID

		productIDs2 := make([]int, 0, len(basketItems))
		for _, item := range basketItems {
			productIDs2 = append(productIDs2, item.ProductID)
		}
		productNames2, _ := d.GetProductNamesByIDs(productIDs2)

		batchItems := make([]commandItemFull, 0, len(basketItems))
		for _, item := range basketItems {
			productName := productNames2[item.ProductID]
			if productName == "" {
				productName = fmt.Sprintf("Produit #%d", item.ProductID)
			}
			batchItems = append(batchItems, commandItemFull{
				CommandID:       commandID,
				Produit:         productName,
				ProductID:       item.ProductID,
				Quantite:        item.Quantity,
				Prix:            item.Price,
				IsReward:        item.IsReward,
				RewardPoolKey:   item.RewardPoolKey,
				ClientUsername:  username,
				ClientNom:       clientNom,
				ClientPrenom:    clientPrenom,
				ClientTelephone: clientTelephone,
				DeliveryAddress: deliveryAddress,
				Status:          "pending",
			})
		}
		if err := tx.Create(&batchItems).Error; err != nil {
			return fmt.Errorf("erreur insertion items: %w", err)
		}

		// Les articles récompense (payés en points) restent des produits physiques
		// réellement distribués : le stock doit être décrémenté comme pour un
		// article payant.
		for _, item := range basketItems {
			var currentStock float64
			if err := tx.Raw(`SELECT stock FROM products WHERE id = ? FOR UPDATE`, item.ProductID).Scan(&currentStock).Error; err != nil {
				return fmt.Errorf("erreur lecture stock produit %d: %w", item.ProductID, err)
			}
			if currentStock < item.Quantity {
				return fmt.Errorf("stock insuffisant pour le produit %d", item.ProductID)
			}
			if err := tx.Exec(`UPDATE products SET stock = stock - ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?`, item.Quantity, item.ProductID).Error; err != nil {
				return fmt.Errorf("erreur décrémentation stock produit %d: %w", item.ProductID, err)
			}
		}
		if err := tx.Exec(`DELETE FROM baskets WHERE username = ?`, username).Error; err != nil {
			return err
		}

		command = &models.Command{
			ID:              commandID,
			ClientOrderID:   cmdResult.ClientOrderID,
			Username:        username,
			Status:          "pending",
			Total:           totalPrix,
			DeliveryAddress: deliveryAddress,
			CreatedAt:       cmdResult.CreatedAt,
			UpdatedAt:       cmdResult.UpdatedAt,
		}
		return nil
	})
	if err != nil {
		log.Printf("❌ Erreur création commande: %v", err)
		return nil, err
	}

	sanitizedAddress := sanitizeLogMessage(deliveryAddress)
	d.AddCommandLog(command.ID, "created",
		fmt.Sprintf("Commande créée - Adresse: %s - Total: %.2f€ - Client: %s %s",
			sanitizedAddress, totalPrix, sanitizeLogMessage(clientNom), sanitizeLogMessage(clientPrenom)),
		username)

	return command, nil
}

func (d *Database) GetApprovedCommands() ([]models.Command, error) {
	var commands []models.Command
	err := d.GDB.Where("status = ?", "approved").Order("created_at DESC").Find(&commands).Error
	return commands, err
}

func (d *Database) GetAllCommands(status, username string) ([]map[string]any, error) {
	if username != "" {
		if err := validateUsername(username); err != nil {
			return nil, err
		}
	}

	if status != "" {
		if err := validateCommandStatus(status); err != nil {
			return nil, err
		}
	}

	var rows []struct {
		ID                    int       `gorm:"column:id"`
		Username              string    `gorm:"column:username"`
		Status                string    `gorm:"column:status"`
		Adresse               string    `gorm:"column:adresse"`
		TotalPrix             float64   `gorm:"column:total_prix"`
		LivreurAssign         *string   `gorm:"column:livreur_assign"`
		CreatedAt             time.Time `gorm:"column:created_at"`
		UpdatedAt             time.Time `gorm:"column:updated_at"`
		ProposedAddress       *string   `gorm:"column:proposed_address"`
		AddressProposalStatus string    `gorm:"column:address_proposal_status"`
		ClientOrderNumber     int       `gorm:"column:client_order_number"`
		ReferralUsed          float64   `gorm:"column:referral_used"`
		CancelReason          string    `gorm:"column:cancel_reason"`
	}

	gdb := d.GDB.Table("commandes c").
		Select(`c.id, c.username, c.status, c.adresse, c.total_prix,
		        c.livreur_assign, c.created_at, c.updated_at,
		        c.proposed_address, c.address_proposal_status,
		        c.client_order_id AS client_order_number,
		        COALESCE(c.referral_used, 0) AS referral_used,
		        COALESCE(c.cancel_reason, '') AS cancel_reason`)

	if status == "" {
		gdb = gdb.Where("c.status IN ?", []string{"pending", "assigned", "en_route", "arrived", "livre"})
	} else {
		gdb = gdb.Where("c.status = ?", status)
	}

	if username != "" {
		gdb = gdb.Where("c.username = ?", username)
	}

	if err := gdb.Order("c.created_at DESC").Limit(1000).Scan(&rows).Error; err != nil {
		return nil, fmt.Errorf("erreur lors de la récupération des commandes: %w", err)
	}

	commands := make([]map[string]any, 0, len(rows))
	for _, row := range rows {
		command := map[string]any{
			"id":                      row.ID,
			"username":                row.Username,
			"status":                  row.Status,
			"adresse":                 sanitizeString(row.Adresse),
			"total_prix":              row.TotalPrix,
			"created_at":              row.CreatedAt,
			"updated_at":              row.UpdatedAt,
			"address_proposal_status": row.AddressProposalStatus,
			"client_order_number":     row.ClientOrderNumber,
			"referral_used":           row.ReferralUsed,
			"cancel_reason":           row.CancelReason,
		}

		if row.LivreurAssign != nil {
			command["livreur_assign"] = *row.LivreurAssign
		} else {
			command["livreur_assign"] = nil
		}

		if row.ProposedAddress != nil {
			command["proposed_address"] = *row.ProposedAddress
		} else {
			command["proposed_address"] = nil
		}

		commands = append(commands, command)
	}

	return commands, nil
}

func (d *Database) SetCommandReferralUsed(commandID int, amount float64) error {
	return d.GDB.Exec(`UPDATE commandes SET referral_used = ? WHERE id = ?`, amount, commandID).Error
}

func (d *Database) GetCommandByID(id int) (map[string]any, error) {
	var row struct {
		ID                    int       `gorm:"column:id"`
		Username              string    `gorm:"column:username"`
		Status                string    `gorm:"column:status"`
		Adresse               string    `gorm:"column:adresse"`
		TotalPrix             float64   `gorm:"column:total_prix"`
		LivreurAssign         *string   `gorm:"column:livreur_assign"`
		CreatedAt             time.Time `gorm:"column:created_at"`
		UpdatedAt             time.Time `gorm:"column:updated_at"`
		ProposedAddress       *string   `gorm:"column:proposed_address"`
		AddressProposalStatus string    `gorm:"column:address_proposal_status"`
		ReferralUsed          float64   `gorm:"column:referral_used"`
		ClientOrderNumber     int       `gorm:"column:client_order_number"`
		CancelReason          string    `gorm:"column:cancel_reason"`
		DestLatitude          float64   `gorm:"column:dest_latitude"`
		DestLongitude         float64   `gorm:"column:dest_longitude"`
	}

	if err := d.GDB.Table("commandes c").
		Select(`c.id, c.username, c.status, c.adresse, c.total_prix, c.livreur_assign,
            c.created_at, c.updated_at, c.proposed_address, c.address_proposal_status,
            c.referral_used, c.client_order_id AS client_order_number,
            COALESCE(c.cancel_reason, '') AS cancel_reason,
            COALESCE(c.dest_latitude, 0) AS dest_latitude,
            COALESCE(c.dest_longitude, 0) AS dest_longitude`).
		Where("c.id = ?", id).
		First(&row).Error; err != nil {
		return nil, fmt.Errorf("erreur lors de la récupération de la commande: %w", err)
	}
	if row.ID == 0 {
		return nil, fmt.Errorf("commande non trouvée")
	}

	command := map[string]any{
		"id":                      row.ID,
		"username":                row.Username,
		"status":                  row.Status,
		"adresse":                 row.Adresse,
		"total_prix":              row.TotalPrix,
		"created_at":              row.CreatedAt,
		"updated_at":              row.UpdatedAt,
		"address_proposal_status": row.AddressProposalStatus,
		"referral_used":           row.ReferralUsed,
		"client_order_number":     row.ClientOrderNumber,
		"cancel_reason":           row.CancelReason,
		"dest_latitude":           row.DestLatitude,
		"dest_longitude":          row.DestLongitude,
	}

	if row.LivreurAssign != nil {
		command["livreur_assign"] = *row.LivreurAssign
	} else {
		command["livreur_assign"] = nil
	}

	if row.ProposedAddress != nil {
		command["proposed_address"] = *row.ProposedAddress
	} else {
		command["proposed_address"] = nil
	}

	return command, nil
}

const lastDeliveryCoordsCacheTTL = 5 * time.Minute

func lastDeliveryCoordsCacheKey(livreurUsername string) string {
	return fmt.Sprintf("livreur:last_delivery_coords:%s", livreurUsername)
}

// GetLastDeliveryCoords retourne les coordonnées GPS de la dernière livraison terminée d'un livreur.
// Utilisé comme fallback quand le GPS temps réel est indisponible. Mis en cache quelques minutes
// car appelé à chaque calcul d'ETA et la dernière livraison ne change pas souvent.
func (d *Database) GetLastDeliveryCoords(livreurUsername string) (float64, float64, error) {
	cacheKey := lastDeliveryCoordsCacheKey(livreurUsername)

	if cached, err := Redis.Get(RedisCtx, cacheKey).Result(); err == nil {
		var coords struct {
			Lat float64 `json:"lat"`
			Lon float64 `json:"lon"`
		}
		if jsonErr := json.Unmarshal([]byte(cached), &coords); jsonErr == nil {
			return coords.Lat, coords.Lon, nil
		}
	}

	var result struct {
		DestLatitude  float64 `gorm:"column:dest_latitude"`
		DestLongitude float64 `gorm:"column:dest_longitude"`
	}

	if err := d.GDB.Table("commandes").
		Select("dest_latitude, dest_longitude").
		Where("livreur_assign = ? AND status IN (?, ?, ?) AND dest_latitude IS NOT NULL AND dest_latitude != 0 AND dest_longitude IS NOT NULL AND dest_longitude != 0",
			livreurUsername, "livre", "delivered", "approved").
		Order("updated_at DESC").
		Limit(1).
		Scan(&result).Error; err != nil {
		return 0, 0, fmt.Errorf("aucune livraison précédente pour %s: %w", livreurUsername, err)
	}

	if result.DestLatitude == 0 || result.DestLongitude == 0 {
		return 0, 0, fmt.Errorf("coordonnées introuvables pour dernière livraison de %s", livreurUsername)
	}

	if coordsJSON, err := json.Marshal(map[string]float64{"lat": result.DestLatitude, "lon": result.DestLongitude}); err == nil {
		Redis.Set(RedisCtx, cacheKey, coordsJSON, lastDeliveryCoordsCacheTTL)
	}

	return result.DestLatitude, result.DestLongitude, nil
}

// GetClientOrderID retourne le client_order_id (numéro perso du client) pour un commandID global.
// Retourne commandID en fallback si introuvable.
func (d *Database) GetClientOrderID(commandID int) int {
	var result struct {
		ClientOrderID int `gorm:"column:client_order_id"`
	}
	if err := d.GDB.Model(&models.Command{}).Select("client_order_id").Where("id = ?", commandID).First(&result).Error; err != nil || result.ClientOrderID == 0 {
		return commandID
	}
	return result.ClientOrderID
}

func (d *Database) UpdateCommandAddress(commandID int, deliveryAddress string) error {
	if len(deliveryAddress) > 500 {
		return fmt.Errorf("adresse trop longue (max 500 caractères)")
	}
	if strings.TrimSpace(deliveryAddress) == "" {
		return fmt.Errorf("adresse vide non autorisée")
	}

	result := d.GDB.Model(&models.Command{}).Where("id = ?", commandID).Updates(map[string]any{
		"adresse":    deliveryAddress,
		"updated_at": time.Now(),
	})
	if result.Error != nil {
		return fmt.Errorf("erreur lors de la mise à jour de l'adresse: %w", result.Error)
	}
	if result.RowsAffected == 0 {
		return fmt.Errorf("commande non trouvée")
	}

	log.Printf("✅ Adresse commande %d mise à jour", commandID)
	return nil
}

// UpdateOwnCommandAddress permet à un client de corriger l'adresse de SA
// PROPRE commande, tant qu'elle n'est pas encore prise en charge par un
// livreur (statut "en_route") ni terminée. La vérification d'appartenance et
// de statut se fait dans la clause WHERE, atomiquement : impossible de
// modifier la commande d'un autre client ou une commande déjà en route.
func (d *Database) UpdateOwnCommandAddress(commandID int, clientUsername, deliveryAddress string) error {
	if err := validateAddress(deliveryAddress); err != nil {
		return err
	}

	result := d.GDB.Exec(`
		UPDATE commandes
		SET adresse = ?, updated_at = CURRENT_TIMESTAMP
		WHERE id = ? AND username = ? AND status IN ('pending', 'assigned')`,
		deliveryAddress, commandID, clientUsername)
	if result.Error != nil {
		return fmt.Errorf("erreur lors de la mise à jour de l'adresse: %w", result.Error)
	}
	if result.RowsAffected == 0 {
		return fmt.Errorf("commande introuvable, non modifiable (déjà en livraison ou terminée), ou n'appartenant pas à ce client")
	}

	d.AddCommandLog(commandID, "address_updated",
		fmt.Sprintf("Adresse corrigée par le client %s", clientUsername),
		clientUsername)

	log.Printf("✅ [UPD_OWN_ADDR] Adresse commande %d corrigée par %s", commandID, clientUsername)
	return nil
}

// ProposeAddressChange propose une nouvelle adresse (admin/cabine) en attente de validation client
func (d *Database) ProposeAddressChange(commandID int, proposedAddress, proposedBy string) error {
	if err := validateAddress(proposedAddress); err != nil {
		return err
	}

	result := d.GDB.Model(&models.Command{}).Where("id = ?", commandID).Updates(map[string]any{
		"proposed_address":        proposedAddress,
		"address_proposal_status": "pending",
		"updated_at":              time.Now(),
	})
	if result.Error != nil {
		return fmt.Errorf("erreur proposition adresse: %w", result.Error)
	}
	if result.RowsAffected == 0 {
		return fmt.Errorf("commande non trouvée")
	}

	d.AddCommandLog(commandID, "address_proposed",
		fmt.Sprintf("Nouvelle adresse proposée par %s: %s", proposedBy, proposedAddress),
		proposedBy)

	log.Printf("✅ Adresse proposée pour commande %d par %s", commandID, proposedBy)
	return nil
}

// RespondToAddressProposal accepte ou refuse la proposition d'adresse
func (d *Database) RespondToAddressProposal(commandID int, clientUsername string, accepted bool) error {
	var query string
	if accepted {
		query = `UPDATE commandes
		         SET adresse = proposed_address, proposed_address = NULL,
		             address_proposal_status = 'accepted', updated_at = CURRENT_TIMESTAMP
		         WHERE id = ? AND username = ? AND address_proposal_status = 'pending'`
	} else {
		query = `UPDATE commandes
		         SET proposed_address = NULL, address_proposal_status = 'rejected',
		             updated_at = CURRENT_TIMESTAMP
		         WHERE id = ? AND username = ? AND address_proposal_status = 'pending'`
	}

	result := d.GDB.Exec(query, commandID, clientUsername)
	if result.Error != nil {
		return fmt.Errorf("erreur réponse proposition adresse: %w", result.Error)
	}
	if result.RowsAffected == 0 {
		return fmt.Errorf("aucune proposition en attente pour cette commande")
	}

	action := "refusée"
	if accepted {
		action = "acceptée"
	}
	d.AddCommandLog(commandID, "address_proposal_"+action,
		fmt.Sprintf("Proposition d'adresse %s par le client %s", action, clientUsername),
		clientUsername)

	log.Printf("✅ Proposition adresse %s pour commande %d", action, commandID)
	return nil
}

// UpdateCommandStatus met à jour le statut d'une commande
func (d *Database) UpdateCommandStatus(commandID int, status string) error {
	if err := validateCommandStatus(status); err != nil {
		return err
	}

	result := d.GDB.Model(&models.Command{}).Where("id = ?", commandID).Updates(map[string]any{
		"status":     status,
		"updated_at": time.Now(),
	})
	if result.Error != nil {
		return fmt.Errorf("erreur lors de la mise à jour du statut: %w", result.Error)
	}
	if result.RowsAffected == 0 {
		return fmt.Errorf("commande non trouvée")
	}

	return nil
}

func (d *Database) AddCommandLog(commandID int, status, message, author string) error {
	sanitizedMessage := sanitizeLogMessage(message)
	sanitizedAuthor := sanitizeLogMessage(author)

	if err := d.GDB.Create(&models.CommandLog{
		CommandID: commandID,
		Status:    status,
		Message:   sanitizedMessage,
		Author:    sanitizedAuthor,
	}).Error; err != nil {
		log.Printf("⚠️  Avertissement: impossible d'ajouter le log (table command_logs peut-être manquante): %v", err)
		return nil
	}

	return nil
}

// GetCommandLogs récupère tous les logs d'une commande
func (d *Database) GetCommandLogs(commandID int) ([]map[string]any, error) {
	var rows []models.CommandLog

	if err := d.GDB.Where("command_id = ?", commandID).Order("created_at ASC").Find(&rows).Error; err != nil {
		log.Printf("⚠️  Avertissement: impossible de récupérer les logs: %v", err)
		return []map[string]any{}, nil
	}

	logs := make([]map[string]any, 0, len(rows))
	for _, row := range rows {
		logs = append(logs, map[string]any{
			"id":         row.ID,
			"command_id": row.CommandID,
			"status":     row.Status,
			"message":    row.Message,
			"author":     row.Author,
			"created_at": row.CreatedAt,
		})
	}

	return logs, nil
}

func sanitizeLogMessage(message string) string {
	sanitized := strings.Map(func(r rune) rune {
		if r < 32 || r == 127 {
			return -1
		}
		return r
	}, message)

	if len(sanitized) > 1000 {
		sanitized = sanitized[:1000]
	}

	return sanitized
}

func (d *Database) ValidateDeliveryAtomic(commandID int, adminUsername string) (int, error) {
	var totalPoints int
	var cmdUsernameOut string
	var livreurAssignOut string

	err := d.GDB.Transaction(func(tx *gorm.DB) error {
		var cmd struct {
			Status        string  `gorm:"column:status"`
			Username      string  `gorm:"column:username"`
			LivreurAssign string  `gorm:"column:livreur_assign"`
			TotalPrix     float64 `gorm:"column:total_prix"`
		}
		if err := tx.Raw(`
			SELECT status, username, COALESCE(livreur_assign, '') as livreur_assign, total_prix
			FROM commandes WHERE id = ? FOR UPDATE`, commandID).Scan(&cmd).Error; err != nil {
			log.Printf("❌ [ValidateAtomic] Erreur SELECT: %v", err)
			return fmt.Errorf("erreur lecture commande: %w", err)
		}
		if cmd.Username == "" {
			log.Printf("❌ [ValidateAtomic] Commande %d non trouvée", commandID)
			return fmt.Errorf("commande non trouvée")
		}

		log.Printf("📋 [ValidateAtomic] Commande trouvée - status=%s, client=%s, livreur=%s",
			cmd.Status, cmd.Username, cmd.LivreurAssign)

		validStatuses := []string{"assigned", "en_route", "pending", "livre"}
		if !slices.Contains(validStatuses, cmd.Status) {
			log.Printf("❌ [ValidateAtomic] Statut invalide pour validation: %s", cmd.Status)
			return fmt.Errorf("statut invalide pour validation: %s", cmd.Status)
		}

		if cmd.Status == "approved" {
			log.Printf("⚠️ [ValidateAtomic] Commande %d déjà approuvée", commandID)
			return fmt.Errorf("commande déjà approuvée")
		}

		result := tx.Exec(`
			UPDATE commandes SET status = 'approved', updated_at = CURRENT_TIMESTAMP
			WHERE id = ? AND status = ?`, commandID, cmd.Status)
		if result.Error != nil {
			log.Printf("❌ [ValidateAtomic] Erreur UPDATE: %v", result.Error)
			return fmt.Errorf("erreur mise à jour statut: %w", result.Error)
		}
		if result.RowsAffected == 0 {
			log.Printf("❌ [ValidateAtomic] Commande %d déjà modifiée (race condition évitée)", commandID)
			return fmt.Errorf("commande déjà modifiée par une autre requête")
		}

		if cmd.Username != "" {
			log.Printf("🔍 [ValidateAtomic] Calcul points pour client: %s", cmd.Username)

			points, _, err := d.CalculateAndAddPointsForCommandTx(tx, commandID, cmd.Username)
			if err != nil {
				log.Printf("❌ [ValidateAtomic] Erreur calcul/ajout points: %v", err)
				return fmt.Errorf("erreur attribution points: %w", err)
			}
			totalPoints = points

			log.Printf("✅ [ValidateAtomic] %d points attribués à %s", totalPoints, cmd.Username)

			if err := tx.Exec(`
				UPDATE clients SET command = command + 1, updated_at = CURRENT_TIMESTAMP
				WHERE username = ?`, cmd.Username).Error; err != nil {
				log.Printf("⚠️ [ValidateAtomic] Erreur incrémentation compteur: %v", err)
			} else {
				log.Printf("✅ [ValidateAtomic] Compteur commandes incrémenté pour %s", cmd.Username)
			}
		}

		if err := tx.Exec(`
			INSERT INTO command_logs (command_id, status, message, author, created_at)
			VALUES (?, ?, ?, ?, CURRENT_TIMESTAMP)`,
			commandID, "approved",
			fmt.Sprintf("Livraison validée par admin %s - %d points attribués", adminUsername, totalPoints),
			adminUsername).Error; err != nil {
			log.Printf("⚠️ [ValidateAtomic] Erreur ajout log: %v", err)
		}

		cmdUsernameOut = cmd.Username
		livreurAssignOut = cmd.LivreurAssign
		return nil
	})

	if err != nil {
		return 0, err
	}

	log.Printf("🎉 [ValidateAtomic] SUCCÈS - Commande %d validée, %d points attribués",
		commandID, totalPoints)

	if livreurAssignOut != "" {
		log.Printf("📦 [ValidateAtomic] Optimisation queue pour livreur: %s", livreurAssignOut)
		go func() {
			if err := d.CompleteDeliveryAndProcessNext(livreurAssignOut, commandID); err != nil {
				log.Printf("⚠️ [ValidateAtomic] Erreur optimisation queue: %v", err)
			}
		}()
	}

	go func() {
		commandCacheKey := fmt.Sprintf("command:%d", commandID)
		Redis.Del(RedisCtx, commandCacheKey)

		if cmdUsernameOut != "" {
			clientCacheKey := fmt.Sprintf("client:%s", cmdUsernameOut)
			Redis.Del(RedisCtx, clientCacheKey)

			clientCommandsCacheKey := fmt.Sprintf("client:%s:commands", cmdUsernameOut)
			Redis.Del(RedisCtx, clientCommandsCacheKey)
		}

		log.Printf("✅ [ValidateAtomic] Caches invalidés pour cmd %d", commandID)
	}()

	return totalPoints, nil
}

// ApproveDeliveryAtomic - Version atomique pour approbation client
func (d *Database) ApproveDeliveryAtomic(commandID int, username string) (int, string, error) {
	log.Printf("🔒 [ApproveAtomic] START - cmd=%d, client=%s", commandID, username)

	var totalPoints int
	var pointCategory string
	var livreurAssignOut string

	err := d.GDB.Transaction(func(tx *gorm.DB) error {
		var cmd struct {
			Status        string `gorm:"column:status"`
			Username      string `gorm:"column:username"`
			LivreurAssign string `gorm:"column:livreur_assign"`
		}
		if err := tx.Raw(`
			SELECT status, username, COALESCE(livreur_assign, '') as livreur_assign
			FROM commandes WHERE id = ? FOR UPDATE`, commandID).Scan(&cmd).Error; err != nil {
			log.Printf("❌ [ApproveAtomic] Erreur SELECT: %v", err)
			return fmt.Errorf("erreur lecture commande: %w", err)
		}
		if cmd.Username == "" {
			log.Printf("❌ [ApproveAtomic] Commande %d non trouvée", commandID)
			return fmt.Errorf("commande non trouvée")
		}

		log.Printf("📋 [ApproveAtomic] Commande trouvée - status=%s, owner=%s", cmd.Status, cmd.Username)

		if cmd.Username != username {
			log.Printf("❌ [ApproveAtomic] Commande n'appartient pas à %s (propriétaire: %s)",
				username, cmd.Username)
			return fmt.Errorf("cette commande ne vous appartient pas")
		}

		if cmd.Status == "approved" {
			log.Printf("ℹ️  [ApproveAtomic] Commande %d déjà approuvée — réponse idempotente", commandID)
			return errAlreadyApproved
		}

		if cmd.Status != "livre" {
			log.Printf("❌ [ApproveAtomic] Statut invalide: %s (attendu: livre)", cmd.Status)
			return fmt.Errorf("commande doit être en statut 'livre' (statut actuel: %s)", cmd.Status)
		}

		result := tx.Exec(`
			UPDATE commandes SET status = 'approved', updated_at = CURRENT_TIMESTAMP
			WHERE id = ? AND status = 'livre' AND username = ?`, commandID, username)
		if result.Error != nil {
			log.Printf("❌ [ApproveAtomic] Erreur UPDATE: %v", result.Error)
			return fmt.Errorf("erreur mise à jour statut: %w", result.Error)
		}
		if result.RowsAffected == 0 {
			log.Printf("❌ [ApproveAtomic] Commande %d déjà modifiée (race condition évitée)", commandID)
			return fmt.Errorf("commande déjà approuvée ou modifiée")
		}

		log.Printf("✅ [ApproveAtomic] Statut mis à jour: livre → approved")

		pts, cat, err := d.CalculateAndAddPointsForCommandTx(tx, commandID, username)
		if err != nil {
			log.Printf("❌ [ApproveAtomic] Erreur calcul points: %v", err)
			return fmt.Errorf("erreur attribution points: %w", err)
		}
		totalPoints = pts
		pointCategory = cat

		log.Printf("✅ [ApproveAtomic] %d points [%s] attribués à %s", totalPoints, pointCategory, username)

		if err := tx.Exec(`
			UPDATE clients SET command = command + 1, updated_at = CURRENT_TIMESTAMP
			WHERE username = ?`, username).Error; err != nil {
			log.Printf("⚠️ [ApproveAtomic] Erreur incrémentation compteur: %v", err)
		}

		if err := tx.Exec(`
			INSERT INTO command_logs (command_id, status, message, author, created_at)
			VALUES (?, ?, ?, ?, CURRENT_TIMESTAMP)`,
			commandID, "approved",
			fmt.Sprintf("Livraison confirmée par le client %s - %d points [%s] attribués", username, totalPoints, pointCategory),
			username).Error; err != nil {
			log.Printf("⚠️ [ApproveAtomic] Erreur ajout log: %v", err)
		}

		livreurAssignOut = cmd.LivreurAssign
		return nil
	})

	if err != nil {
		if errors.Is(err, errAlreadyApproved) {
			return 0, "", nil
		}
		return 0, "", err
	}

	log.Printf("🎉 [ApproveAtomic] SUCCÈS - Commande %d approuvée, %d points [%s] attribués",
		commandID, totalPoints, pointCategory)

	if livreurAssignOut != "" {
		log.Printf("📦 [ApproveAtomic] Optimisation queue pour livreur: %s", livreurAssignOut)
		go func() {
			if err := d.CompleteDeliveryAndProcessNext(livreurAssignOut, commandID); err != nil {
				log.Printf("⚠️ [ApproveAtomic] Erreur optimisation queue: %v", err)
			}
		}()
	}

	go func() {
		commandCacheKey := fmt.Sprintf("command:%d", commandID)
		Redis.Del(RedisCtx, commandCacheKey)

		clientCacheKey := fmt.Sprintf("client:%s", username)
		Redis.Del(RedisCtx, clientCacheKey)

		clientCommandsCacheKey := fmt.Sprintf("client:%s:commands", username)
		Redis.Del(RedisCtx, clientCommandsCacheKey)

		log.Printf("✅ [ApproveAtomic] Caches invalidés")
	}()

	return totalPoints, pointCategory, nil
}

// ApproveDeliveryAtomicByStaff - Confirmation de réception par admin ou cabine à la place du client
func (d *Database) ApproveDeliveryAtomicByStaff(commandID int, staffUsername string) (int, string, string, error) {
	log.Printf("🔒 [ApproveAtomicStaff] START - cmd=%d, staff=%s", commandID, staffUsername)

	var totalPoints int
	var pointCategory string
	var clientUsernameOut string
	var livreurAssignOut string

	err := d.GDB.Transaction(func(tx *gorm.DB) error {
		var cmd struct {
			Status        string `gorm:"column:status"`
			Username      string `gorm:"column:username"`
			LivreurAssign string `gorm:"column:livreur_assign"`
		}
		if err := tx.Raw(`
			SELECT status, username, COALESCE(livreur_assign, '') as livreur_assign
			FROM commandes WHERE id = ? FOR UPDATE`, commandID).Scan(&cmd).Error; err != nil {
			return fmt.Errorf("erreur lecture commande: %w", err)
		}
		if cmd.Username == "" {
			return fmt.Errorf("commande non trouvée")
		}

		if cmd.Status != "livre" {
			return fmt.Errorf("commande doit être en statut 'livre' (statut actuel: %s)", cmd.Status)
		}

		result := tx.Exec(`
			UPDATE commandes SET status = 'approved', updated_at = CURRENT_TIMESTAMP
			WHERE id = ? AND status = 'livre'`, commandID)
		if result.Error != nil {
			return fmt.Errorf("erreur mise à jour statut: %w", result.Error)
		}
		if result.RowsAffected == 0 {
			return fmt.Errorf("commande déjà approuvée ou modifiée")
		}

		pts, cat, err := d.CalculateAndAddPointsForCommandTx(tx, commandID, cmd.Username)
		if err != nil {
			return fmt.Errorf("erreur attribution points: %w", err)
		}
		totalPoints = pts
		pointCategory = cat

		if err := tx.Exec(`
			UPDATE clients SET command = command + 1, updated_at = CURRENT_TIMESTAMP
			WHERE username = ?`, cmd.Username).Error; err != nil {
			log.Printf("⚠️ [ApproveAtomicStaff] Erreur incrémentation compteur: %v", err)
		}

		if err := tx.Exec(`
			INSERT INTO command_logs (command_id, status, message, author, created_at)
			VALUES (?, ?, ?, ?, CURRENT_TIMESTAMP)`,
			commandID, "approved",
			fmt.Sprintf("Réception confirmée par %s au nom du client %s - %d points attribués", staffUsername, cmd.Username, totalPoints),
			staffUsername).Error; err != nil {
			log.Printf("⚠️ [ApproveAtomicStaff] Erreur log: %v", err)
		}

		clientUsernameOut = cmd.Username
		livreurAssignOut = cmd.LivreurAssign
		return nil
	})

	if err != nil {
		return 0, "", "", err
	}

	log.Printf("🎉 [ApproveAtomicStaff] SUCCÈS - cmd=%d approuvée par %s, %d points → client %s",
		commandID, staffUsername, totalPoints, clientUsernameOut)

	if livreurAssignOut != "" {
		go func() {
			if err := d.CompleteDeliveryAndProcessNext(livreurAssignOut, commandID); err != nil {
				log.Printf("⚠️ [ApproveAtomicStaff] Erreur queue: %v", err)
			}
		}()
	}

	go func() {
		Redis.Del(RedisCtx, fmt.Sprintf("command:%d", commandID))
		Redis.Del(RedisCtx, fmt.Sprintf("client:%s", clientUsernameOut))
		Redis.Del(RedisCtx, fmt.Sprintf("client:%s:commands", clientUsernameOut))
	}()

	return totalPoints, pointCategory, clientUsernameOut, nil
}

func (d *Database) SetCommandCancelReason(commandID int, reason string) error {
	if len(reason) > 500 {
		reason = reason[:500]
	}
	return d.GDB.Exec(
		`UPDATE commandes SET cancel_reason = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?`,
		reason, commandID,
	).Error
}