controllers/voucher_controller.go

package controllers

import (
	"net/http"
	"service-warungpos-go/config"
	"service-warungpos-go/models"
	"strconv"

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

// List Vouchers
func GetVouchers(c *gin.Context) {
	userVal, _ := c.Get("user")
	user := userVal.(*models.User)

	var vouchers []models.Voucher
	query := config.DB.Where("company_id = ?", *user.CompanyID)

	// Filter by branch_id if provided
	branchIDStr := c.Query("branch_id")
	if branchIDStr != "" {
		if bID, err := strconv.Atoi(branchIDStr); err == nil {
			// Jika voucher memiliki branch_id spesifik, atau branch_id null (berlaku semua cabang)
			query = query.Where("branch_id = ? OR branch_id IS NULL", bID)
		}
	}

	if err := query.Order("created_at desc").Find(&vouchers).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal mengambil data voucher"})
		return
	}

	c.JSON(http.StatusOK, vouchers)
}

// Create Voucher
type CreateVoucherRequest struct {
	Name          string `json:"name" binding:"required"`
	DiscountValue int    `json:"discount_value" binding:"required,gt=0"`
	PointCost     int    `json:"point_cost" binding:"required,gt=0"`
	MinPurchase   int    `json:"min_purchase"`
	BranchID      *uint  `json:"branch_id"`
	IsActive      *bool  `json:"is_active"`
}

func CreateVoucher(c *gin.Context) {
	userVal, _ := c.Get("user")
	user := userVal.(*models.User)

	if user.Role != "owner" {
		c.JSON(http.StatusForbidden, gin.H{"detail": "Akses ditolak"})
		return
	}

	var req CreateVoucherRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": "Data tidak valid"})
		return
	}

	isActive := true
	if req.IsActive != nil {
		isActive = *req.IsActive
	}

	voucher := models.Voucher{
		CompanyID:     *user.CompanyID,
		Name:          req.Name,
		DiscountValue: req.DiscountValue,
		PointCost:     req.PointCost,
		MinPurchase:   req.MinPurchase,
		BranchID:      req.BranchID,
		IsActive:      isActive,
	}

	if err := config.DB.Create(&voucher).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal menyimpan voucher"})
		return
	}

	c.JSON(http.StatusCreated, voucher)
}

// Update Voucher
func UpdateVoucher(c *gin.Context) {
	userVal, _ := c.Get("user")
	user := userVal.(*models.User)

	if user.Role != "owner" {
		c.JSON(http.StatusForbidden, gin.H{"detail": "Akses ditolak"})
		return
	}

	id := c.Param("id")
	var voucher models.Voucher
	if err := config.DB.Where("id = ? AND company_id = ?", id, *user.CompanyID).First(&voucher).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Voucher tidak ditemukan"})
		return
	}

	var req CreateVoucherRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": "Data tidak valid"})
		return
	}

	voucher.Name = req.Name
	voucher.DiscountValue = req.DiscountValue
	voucher.PointCost = req.PointCost
	voucher.MinPurchase = req.MinPurchase
	voucher.BranchID = req.BranchID
	if req.IsActive != nil {
		voucher.IsActive = *req.IsActive
	}

	if err := config.DB.Save(&voucher).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal mengupdate voucher"})
		return
	}

	c.JSON(http.StatusOK, voucher)
}

// Delete Voucher
func DeleteVoucher(c *gin.Context) {
	userVal, _ := c.Get("user")
	user := userVal.(*models.User)

	if user.Role != "owner" {
		c.JSON(http.StatusForbidden, gin.H{"detail": "Akses ditolak"})
		return
	}

	id := c.Param("id")
	if err := config.DB.Where("id = ? AND company_id = ?", id, *user.CompanyID).Delete(&models.Voucher{}).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"detail": "Gagal menghapus voucher"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"detail": "Voucher berhasil dihapus"})
}