package handler

import (
	"net/http"
	"strconv"

	"evanpage-backend/internal/service"
	"github.com/gin-gonic/gin"
)

type AdminHandler struct {
	userService *service.UserService
}

func NewAdminHandler(userService *service.UserService) *AdminHandler {
	return &AdminHandler{userService: userService}
}

func (h *AdminHandler) ListUsers(c *gin.Context) {
	users, err := h.userService.ListUsers()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"users": users})
}

func (h *AdminHandler) CreateUser(c *gin.Context) {
	var req struct {
		Username string `json:"username" binding:"required"`
		Email    string `json:"email" binding:"required,email"`
		Password string `json:"password" binding:"required,min=6"`
		Role     string `json:"role" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	user, err := h.userService.Register(req.Username, req.Email, req.Password, req.Role)
	if err != nil {
		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":       user.ID,
		"username": user.Username,
		"email":    user.Email,
		"role":     user.Role,
	})
}

func (h *AdminHandler) DeleteUser(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}

	if err := h.userService.DeleteUser(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "user deleted"})
}