package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/skip2/go-qrcode"
	"gorm.io/gorm"

	"github.com/wangjia/pay/internal/model"
	"github.com/wangjia/pay/internal/util"
)

type PageHandler struct {
	db      *gorm.DB
	webDir  string
}

func NewPageHandler(db *gorm.DB, webDir string) *PageHandler {
	return &PageHandler{db: db, webDir: webDir}
}

// ResultPage GET /result —— 支付结果页（return_url 落地）。
func (h *PageHandler) ResultPage(c *gin.Context) {
	c.File(h.webDir + "/result.html")
}

// QRCode GET /qrcode?text=xxx —— 把任意字符串渲染成二维码 PNG（用于展示支付宝扫码码串）。
func (h *PageHandler) QRCode(c *gin.Context) {
	text := c.Query("text")
	if text == "" {
		util.RespondError(c, http.StatusBadRequest, "bad_request", "缺少 text 参数")
		return
	}
	png, err := qrcode.Encode(text, qrcode.Medium, 256)
	if err != nil {
		util.RespondError(c, http.StatusInternalServerError, "qr_failed", err.Error())
		return
	}
	c.Data(http.StatusOK, "image/png", png)
}

// ListProducts GET /api/v1/products —— 上架套餐列表（金额来自服务端）。
func (h *PageHandler) ListProducts(c *gin.Context) {
	var products []model.Product
	if err := h.db.Where("active = ?", true).Order("sort asc, id asc").Find(&products).Error; err != nil {
		util.RespondError(c, http.StatusInternalServerError, "list_failed", err.Error())
		return
	}
	out := make([]gin.H, 0, len(products))
	for _, p := range products {
		out = append(out, gin.H{
			"id":          p.ID,
			"name":        p.Name,
			"description": p.Description,
			"price":       p.Price,
			"biz_code":    p.BizCode, // 业务方按 biz_code 查 product_id
		})
	}
	util.RespondSuccess(c, out)
}