package handler

import (
	"net/http"
	"os"
	"time"

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

	"github.com/wangjia/jiu/backend/internal/model"
)

type PublicHandler struct {
	db *gorm.DB
}

func NewPublicHandler(db *gorm.DB) *PublicHandler {
	return &PublicHandler{db: db}
}

// GetProduct GET /api/v1/public/products/:public_id (no auth)
func (h *PublicHandler) GetProduct(c *gin.Context) {
	publicID := c.Param("public_id")

	var product model.Product
	if err := h.db.Where("public_id = ? AND deleted_at IS NULL", publicID).
		Preload("Images").
		First(&product).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
		return
	}

	// Fetch shop public info
	var shop model.Shop
	shopData := gin.H{}
	if err := h.db.Where("id = ?", product.ShopID).First(&shop).Error; err == nil {
		shopData = gin.H{
			"name":           shop.Name,
			"code":           shop.Code,
			"address":        shop.Address,
			"phone":          shop.Phone,
			"business_hours": shop.BusinessHours,
		}
	}

	// Fetch latest inventory batch for this product
	var inv model.Inventory
	batchData := gin.H(nil)
	if err := h.db.Where("product_id = ? AND quantity > 0 AND deleted_at IS NULL", product.ID).
		Order("created_at DESC").
		First(&inv).Error; err == nil {
		var pdStr *string
		if inv.ProductionDate != nil {
			s := inv.ProductionDate.Time.Format("2006-01-02")
			pdStr = &s
		}
		batchData = gin.H{
			"production_date": pdStr,
			"batch_no":        inv.BatchNo,
			"in_stock_date":   inv.CreatedAt.Format("2006-01-02"),
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"data": gin.H{
			"id":          product.ID,
			"name":        product.Name,
			"series":      product.Series,
			"spec":        product.Spec,
			"brand":       product.Brand,
			"unit":        product.Unit,
			"description": product.Description,
			"images":      product.Images,
			"shop":        shopData,
			"batch":       batchData,
		},
	})
}

// GetRelease GET /api/v1/public/release (no auth)
func (h *PublicHandler) GetRelease(c *gin.Context) {
	version := os.Getenv("APP_VERSION")
	if version == "" {
		version = "1.0.0"
	}
	buildDate := os.Getenv("BUILD_DATE")
	if buildDate == "" {
		buildDate = time.Now().Format("2006-01-02")
	}

	c.JSON(http.StatusOK, gin.H{
		"version":    version,
		"build_date": buildDate,
		"download_urls": gin.H{
			"macos":   os.Getenv("DOWNLOAD_URL_MACOS"),
			"windows": os.Getenv("DOWNLOAD_URL_WINDOWS"),
			"web":     "https://jiu.51yanmei.com/app",
		},
		"changelog": []gin.H{},
	})
}