package handlers

import (
	"encoding/json"
	"gestion/db"
	"gestion/services"
	"io"
	"log"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
)

// IPNWebhook - POST /api/v1/webhooks/nowpayments
func IPNWebhook(c *gin.Context) {
	database := c.MustGet("database").(*db.Database)
	npRaw, npExists := c.Get("nowpayments")
	np, ok := npRaw.(*services.NowPaymentsClient)
	if !npExists || !ok || np == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{"error": "paiement crypto non configuré"})
		return
	}

	body, err := io.ReadAll(c.Request.Body)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "impossible de lire le corps"})
		return
	}

	sig := c.GetHeader("x-nowpayments-sig")
	if !np.VerifyIPN(body, sig) {
		log.Printf("[IPN] signature invalide")
		c.JSON(http.StatusUnauthorized, gin.H{"error": "signature invalide"})
		return
	}

	var payload services.IPNPayload
	if err := json.Unmarshal(body, &payload); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "payload invalide"})
		return
	}

	payment, err := database.GetCryptoPaymentByNowPaymentID(payload.PaymentID.String())
	if err != nil || payment == nil {
		log.Printf("[IPN] paiement introuvable: %s", payload.PaymentID.String())
		c.JSON(http.StatusOK, gin.H{"ok": true})
		return
	}

	payAmount, _ := payload.PayAmount.Float64()
	if err := database.UpdateCryptoPaymentStatus(payment.ID, payload.PaymentStatus, payAmount); err != nil {
		log.Printf("[IPN] erreur mise à jour paiement %d: %v", payment.ID, err)
		c.JSON(http.StatusBadRequest, gin.H{"error": "erreur base de données"})
		return
	}

	switch payload.PaymentStatus {
	case "finished", "confirmed":
		if err := database.ActivateCryptoCommand(payment.CommandID); err != nil {
			log.Printf("[IPN] erreur activation commande %d: %v", payment.CommandID, err)
		} else {
			log.Printf("[IPN] commande %d activée (paiement %s confirmé)", payment.CommandID, payload.PaymentID.String())
		}
	case "failed", "expired":
		if err := database.CancelCryptoCommand(payment.CommandID); err != nil {
			log.Printf("[IPN] erreur annulation commande %d: %v", payment.CommandID, err)
		} else {
			log.Printf("[IPN] commande %d annulée (paiement %s)", payment.CommandID, payload.PaymentStatus)
		}
	}

	c.JSON(http.StatusOK, gin.H{"ok": true})
}

// GetCommandPaymentStatus - GET /api/v1/commands/:id/payment-status
// Retourne le statut du paiement crypto d'une commande (polling côté client)
// Effectue un refresh temps réel depuis NowPayments si le paiement est encore en attente
func GetCommandPaymentStatus(c *gin.Context) {
	database := c.MustGet("database").(*db.Database)

	commandID, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "id de commande invalide"})
		return
	}

	payment, err := database.GetCryptoPaymentByCommandID(commandID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "erreur base de données"})
		return
	}
	if payment == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "aucun paiement crypto pour cette commande"})
		return
	}

	// Refresh temps réel depuis NowPayments pour les statuts intermédiaires (comme la référence)
	switch payment.Status {
	case "waiting", "confirming", "confirmed", "sending":
		np, npOk := c.Get("nowpayments")
		if npOk && np != nil {
			npClient := np.(*services.NowPaymentsClient)
			npStatus, err := npClient.GetPaymentStatus(payment.NowPaymentID)
			if err == nil && npStatus.PaymentStatus != payment.Status {
				payAmount, _ := npStatus.PayAmount.Float64()
				if updateErr := database.UpdateCryptoPaymentStatus(payment.ID, npStatus.PaymentStatus, payAmount); updateErr == nil {
					payment.Status = npStatus.PaymentStatus
					payment.PayAmount = payAmount
					log.Printf("[PAYMENT-STATUS] cmd %d: %s → %s (refresh temps réel)", commandID, payment.Status, npStatus.PaymentStatus)
				}
				switch npStatus.PaymentStatus {
				case "finished", "confirmed":
					_ = database.ActivateCryptoCommand(commandID)
				case "failed", "expired":
					_ = database.CancelCryptoCommand(commandID)
				}
			}
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"command_id":     payment.CommandID,
		"payment_status": payment.Status,
		"pay_address":    payment.PayAddress,
		"pay_amount":     payment.PayAmount,
		"pay_currency":   payment.PayCurrency,
		"price_amount":   payment.PriceAmount,
		"price_currency": payment.PriceCurrency,
	})
}