package eshop

import (
	"encoding/json"
	"fmt"
	"net/http"

	"fotbal-club/internal/config"
	"fotbal-club/internal/models"
	"fotbal-club/internal/services"
	"fotbal-club/pkg/database"

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

type ShippingController struct {
	Config         *config.Config
	PacketaService *services.PacketaService
}

func NewShippingController(cfg *config.Config) *ShippingController {
	return &ShippingController{
		Config:         cfg,
		PacketaService: services.NewPacketaService(cfg),
	}
}

// GetPacketaWidgetConfig returns the configuration for the Packeta widget
func (c *ShippingController) GetPacketaWidgetConfig(ctx *gin.Context) {
	ctx.JSON(http.StatusOK, gin.H{
		"api_key": c.Config.PacketaWidgetAPIKey,
		"env":     c.Config.PacketaEnv,
	})
}

// DownloadLabel handles the download of a shipping label PDF
// GET /api/v1/eshop/shipping/labels/:packet_id
func (c *ShippingController) DownloadLabel(ctx *gin.Context) {
	packetID := ctx.Param("packet_id")
	if packetID == "" {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Missing packet ID"})
		return
	}

	// In MVP, we might not have label download implemented in service yet
	// pdfData, err := c.PacketaService.GetPacketLabel(packetID)
	// Placeholder
	pdfData, err := c.PacketaService.GetPacketLabel(packetID)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to download label"})
		return
	}

	ctx.Header("Content-Type", "application/pdf")
	ctx.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="label_%s.pdf"`, packetID))
	ctx.Data(http.StatusOK, "application/pdf", pdfData)
}

// CreatePacket creates a shipment in Packeta system from an order
func (c *ShippingController) CreatePacket(ctx *gin.Context) {
	id := ctx.Param("id")

	// Use a new DB connection or pass it via struct if possible.
	// For now, InitDB (cached instance)
	db, _ := database.InitDB()

	var order models.EshopOrder
	if err := db.First(&order, id).Error; err != nil {
		ctx.JSON(http.StatusNotFound, gin.H{"error": "Order not found"})
		return
	}

	if order.ShippingMethod != "packeta" {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Not a Packeta order"})
		return
	}

	// Parse shipping address JSON to get point ID
	// Format: {"id":"123", "name":"Z-Point..."}
	var pointData struct {
		ID interface{} `json:"id"`
	}
	if err := json.Unmarshal([]byte(order.ShippingAddressJSON), &pointData); err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to parse shipping address"})
		return
	}

	addressID := fmt.Sprintf("%v", pointData.ID)
	if addressID == "" {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Missing Packeta point ID"})
		return
	}

	packetID, err := c.PacketaService.CreatePacket(&order, addressID)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Packeta API error: " + err.Error()})
		return
	}

	// Create Label record
	label := models.EshopShippingLabel{
		OrderID:         order.ID,
		PacketaPacketID: packetID,
		Carrier:         "packeta",
		Status:          "created",
	}
	db.Create(&label)

	// Update order status
	order.Status = "ready_to_ship"
	db.Save(&order)

	ctx.JSON(http.StatusOK, gin.H{
		"packet_id": packetID,
		"status":    "created",
	})
}

// Background job
func (c *ShippingController) UpdatePacketStatuses(db *gorm.DB) {
	var labels []models.EshopShippingLabel
	// Check active shipments
	if err := db.Where("status NOT IN ?", []string{"delivered", "cancelled", "returned"}).Find(&labels).Error; err != nil {
		return
	}

	for _, label := range labels {
		status, err := c.PacketaService.GetPacketStatus(label.PacketaPacketID)
		if err != nil {
			continue
		}

		if label.Status != status {
			// Update label status
			label.Status = status
			if err := db.Save(&label).Error; err != nil {
				continue
			}

			// Update order status based on shipping status
			c.updateOrderStatusFromShipping(db, label.OrderID, status)
		}
	}
}

// updateOrderStatusFromShipping updates order status based on shipping status
func (c *ShippingController) updateOrderStatusFromShipping(db *gorm.DB, orderID uint, shippingStatus string) {
	var newOrderStatus string

	switch shippingStatus {
	case "ready_to_ship", "collected":
		newOrderStatus = "processing"
	case "in_transit", "out_for_delivery":
		newOrderStatus = "shipped"
	case "delivered":
		newOrderStatus = "completed"
	case "cancelled", "returned":
		newOrderStatus = shippingStatus
	default:
		return // No status change needed
	}

	if err := db.Model(&models.EshopOrder{}).
		Where("id = ?", orderID).
		Update("status", newOrderStatus).Error; err != nil {
		// Log error but don't fail the entire process
		return
	}
}