package handler

import (
	"sort"
	"strconv"

	"affiliate_dash/internal/middleware"
	"affiliate_dash/internal/pkg/response"
	"affiliate_dash/internal/service"

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

// MerchantHandler 提供商户后台与平台管理员的多租户管理能力。
type MerchantHandler struct {
	merchantSvc    *service.MerchantService
	fulfillmentSvc *service.FulfillmentService
	callbackSvc    *service.CallbackService
	deliverySvc    *service.DeliveryService
	rechargeSvc    *service.RechargeService
}

func NewMerchantHandler(merchantSvc *service.MerchantService, fulfillmentSvc *service.FulfillmentService, callbackSvc *service.CallbackService, deliverySvc *service.DeliveryService, rechargeSvc *service.RechargeService) *MerchantHandler {
	return &MerchantHandler{
		merchantSvc:    merchantSvc,
		fulfillmentSvc: fulfillmentSvc,
		callbackSvc:    callbackSvc,
		deliverySvc:    deliverySvc,
		rechargeSvc:    rechargeSvc,
	}
}

func (h *MerchantHandler) Current(c *gin.Context) {
	merchant, err := h.merchantSvc.GetMerchant(middleware.GetMerchantID(c))
	if err != nil {
		response.NotFound(c, err.Error())
		return
	}
	response.OK(c, gin.H{
		"merchant":    merchant,
		"role":        middleware.GetMerchantRole(c),
		"permissions": mapKeys(middleware.GetMerchantPermissions(c)),
	})
}

func mapKeys(values map[string]struct{}) []string {
	keys := make([]string, 0, len(values))
	for key := range values {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	return keys
}

func pageParams(c *gin.Context) (int, int) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
	return page, size
}