package http

import (
	"net/http"
	"strconv"

	"auroragolang/internal/domain/model"
	"auroragolang/internal/usecase"

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

type UserHandler struct {
	service *usecase.UserService
}

type ErrorResponse struct {
	Error string `json:"error"`
}

func NewUserHandler(service *usecase.UserService) *UserHandler {
	return &UserHandler{service: service}
}

// ListUsers godoc
// @Summary      获取用户列表
// @Description  返回所有用户
// @Tags         users
// @Produce      json
// @Success      200  {array}   model.User
// @Failure      500  {object}  ErrorResponse
// @Router       /api/v1/users [get]
func (h *UserHandler) ListUsers(c *gin.Context) {
	users, err := h.service.ListUsers()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, users)
}

// GetUser godoc
// @Summary      获取指定用户
// @Description  根据用户 ID 获取详情
// @Tags         users
// @Produce      json
// @Param        id   path      int  true  "用户 ID"
// @Success      200  {object}  model.User
// @Failure      400  {object}  ErrorResponse
// @Failure      404  {object}  ErrorResponse
// @Router       /api/v1/users/{id} [get]
func (h *UserHandler) GetUser(c *gin.Context) {
	idParam := c.Param("id")
	id, err := strconv.Atoi(idParam)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的用户ID"})
		return
	}

	user, err := h.service.GetUser(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, user)
}

// CreateUser godoc
// @Summary      创建用户
// @Description  创建新的用户记录
// @Tags         users
// @Accept       json
// @Produce      json
// @Param        user  body      model.User  true  "用户数据"
// @Success      201   {object}  model.User
// @Failure      400   {object}  ErrorResponse
// @Failure      500   {object}  ErrorResponse
// @Router       /api/v1/users [post]
func (h *UserHandler) CreateUser(c *gin.Context) {
	var payload model.User
	if err := c.ShouldBindJSON(&payload); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if err := h.service.CreateUser(&payload); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusCreated, payload)
}