package handlers

import (
	"ezops/internal/models"
	"net/http"
	"strconv"

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

// SNMPHandler SNMP 设备管理 handler // Logan.Li
type SNMPHandler struct {
	db *gorm.DB
}

// NewSNMPHandler 创建 SNMP handler
func NewSNMPHandler(db *gorm.DB) *SNMPHandler {
	return &SNMPHandler{db: db}
}

// ========== SNMP Device CRUD ==========

// ListDevices 列出 SNMP 设备
// GET /api/v1/snmp/devices?page=1&page_size=20&keyword=
func (h *SNMPHandler) ListDevices(c *gin.Context) {
	var devices []models.SNMPDevice
	q := h.db.Model(&models.SNMPDevice{})

	if kw := c.Query("keyword"); kw != "" {
		q = q.Where("name LIKE ? OR ip LIKE ?", "%"+kw+"%", "%"+kw+"%")
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	var total int64
	q.Count(&total)
	q.Offset((page - 1) * pageSize).Limit(pageSize).Order("name ASC").Find(&devices)

	if devices == nil {
		devices = []models.SNMPDevice{}
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: gin.H{"list": devices, "total": total}})
}

// CreateDevice 创建 SNMP 设备
// POST /api/v1/snmp/devices
func (h *SNMPHandler) CreateDevice(c *gin.Context) {
	var device models.SNMPDevice
	if err := c.ShouldBindJSON(&device); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: err.Error()})
		return
	}
	if err := h.db.Create(&device).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: device, Message: "创建成功"})
}

// UpdateDevice 更新 SNMP 设备
// PUT /api/v1/snmp/devices/:id
func (h *SNMPHandler) UpdateDevice(c *gin.Context) {
	id := c.Param("id")
	var device models.SNMPDevice
	if err := h.db.First(&device, id).Error; err != nil {
		c.JSON(http.StatusNotFound, models.Response{Code: 404, Message: "设备不存在"})
		return
	}
	if err := c.ShouldBindJSON(&device); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: err.Error()})
		return
	}
	h.db.Save(&device)
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: device, Message: "更新成功"})
}

// DeleteDevice 删除 SNMP 设备
// DELETE /api/v1/snmp/devices/:id
func (h *SNMPHandler) DeleteDevice(c *gin.Context) {
	id := c.Param("id")
	if err := h.db.Delete(&models.SNMPDevice{}, id).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "删除成功"})
}

// BatchDeleteDevices 批量删除
// DELETE /api/v1/snmp/devices/batch-delete
func (h *SNMPHandler) BatchDeleteDevices(c *gin.Context) {
	var req models.IDsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: err.Error()})
		return
	}
	h.db.Where("id IN ?", req.IDs).Delete(&models.SNMPDevice{})
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "批量删除成功"})
}

// ========== SNMP Template CRUD ==========

// ListTemplates 列出 OID 模板
// GET /api/v1/snmp/templates
func (h *SNMPHandler) ListTemplates(c *gin.Context) {
	var templates []models.SNMPTemplate
	h.db.Order("name ASC").Find(&templates)
	if templates == nil {
		templates = []models.SNMPTemplate{}
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: templates})
}

// CreateTemplate 创建 OID 模板
// POST /api/v1/snmp/templates
func (h *SNMPHandler) CreateTemplate(c *gin.Context) {
	var template models.SNMPTemplate
	if err := c.ShouldBindJSON(&template); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: err.Error()})
		return
	}
	if err := h.db.Create(&template).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: template, Message: "创建成功"})
}

// ========== SNMP Statistics ==========

// GetSNMPStats 获取 SNMP 概览统计
// GET /api/v1/snmp/stats
func (h *SNMPHandler) GetSNMPStats(c *gin.Context) {
	var total, online int64
	h.db.Model(&models.SNMPDevice{}).Count(&total)
	h.db.Model(&models.SNMPDevice{}).Where("status = ?", "online").Count(&online)

	c.JSON(http.StatusOK, models.Response{Code: 200, Data: gin.H{
		"total":  total,
		"online": online,
		"abnormal": total - online,
	}})
}