package handlers

import (
	"net/http"
	"strconv"
	"strings"

	"ezops/internal/models"

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

// ==================== 区域管理（Region）====================

// RegionHandler 区域处理器
type RegionHandler struct {
	db *gorm.DB
}

func NewRegionHandler(db *gorm.DB) *RegionHandler {
	return &RegionHandler{db: db}
}

// regionRequest 区域创建/更新请求
type regionRequest struct {
	Name     string `json:"name"`
	Code     string `json:"code"`
	Provider string `json:"provider"`
	Location string `json:"location"`
	Status   string `json:"status"`
	Endpoint string `json:"endpoint"`
}

// ListRegions 获取区域列表
func (h *RegionHandler) ListRegions(c *gin.Context) {
	var regions []models.Region
	h.db.Find(&regions)

	c.JSON(http.StatusOK, models.Response{
		Code:    200,
		Message: "success",
		Data: models.ListResponse{
			List:  regions,
			Total: int64(len(regions)),
		},
	})
}

// CreateRegion 创建区域
func (h *RegionHandler) CreateRegion(c *gin.Context) {
	var req regionRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "请求参数错误: " + err.Error()})
		return
	}
	if strings.TrimSpace(req.Name) == "" || strings.TrimSpace(req.Code) == "" {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "区域名称和编码不能为空"})
		return
	}

	status := strings.TrimSpace(req.Status)
	if status == "" {
		status = "active"
	}

	region := models.Region{
		Name:     strings.TrimSpace(req.Name),
		Code:     strings.TrimSpace(req.Code),
		Provider: strings.TrimSpace(req.Provider),
		Location: req.Location,
		Status:   status,
		Endpoint: req.Endpoint,
	}
	if err := h.db.Create(&region).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "创建失败，编码可能已存在"})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "创建成功", Data: region})
}

// UpdateRegion 更新区域
func (h *RegionHandler) UpdateRegion(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	var req regionRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "请求参数错误: " + err.Error()})
		return
	}

	var region models.Region
	if err := h.db.First(&region, id).Error; err != nil {
		c.JSON(http.StatusNotFound, models.Response{Code: 404, Message: "区域不存在"})
		return
	}

	if strings.TrimSpace(req.Name) != "" {
		region.Name = strings.TrimSpace(req.Name)
	}
	if strings.TrimSpace(req.Code) != "" {
		region.Code = strings.TrimSpace(req.Code)
	}
	if strings.TrimSpace(req.Provider) != "" {
		region.Provider = strings.TrimSpace(req.Provider)
	}
	region.Location = req.Location
	if strings.TrimSpace(req.Status) != "" {
		region.Status = strings.TrimSpace(req.Status)
	}
	region.Endpoint = req.Endpoint

	if err := h.db.Save(&region).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "更新失败"})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "更新成功", Data: region})
}

// DeleteRegion 删除区域
func (h *RegionHandler) DeleteRegion(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if err := h.db.Delete(&models.Region{}, id).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "删除失败"})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "删除成功"})
}

// BatchDeleteRegions 批量删除区域 // Logan.Li
// @Summary 批量删除区域
// @Description 批量删除区域
// @Tags 云区域
// @Accept json
// @Produce json
// @Security Bearer
// @Param request body models.IDsRequest true "删除请求"
// @Success 200 {object} models.Response
// @Router /regions/batch-delete [delete]
func (h *RegionHandler) BatchDeleteRegions(c *gin.Context) {
	var req models.IDsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "请求参数错误"})
		return
	}

	if err := h.db.Delete(&models.Region{}, req.IDs).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "删除失败"})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "删除成功"})
}