package handler

import (
	"net/http"
	"strconv"

	"cyberstrike-ai/internal/database"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// VulnerabilityHandler 漏洞处理器
type VulnerabilityHandler struct {
	db     *database.DB
	logger *zap.Logger
}

// NewVulnerabilityHandler 创建新的漏洞处理器
func NewVulnerabilityHandler(db *database.DB, logger *zap.Logger) *VulnerabilityHandler {
	return &VulnerabilityHandler{
		db:     db,
		logger: logger,
	}
}

// CreateVulnerabilityRequest 创建漏洞请求
type CreateVulnerabilityRequest struct {
	ConversationID string `json:"conversation_id" binding:"required"`
	Title           string `json:"title" binding:"required"`
	Description     string `json:"description"`
	Severity        string `json:"severity" binding:"required"`
	Status          string `json:"status"`
	Type            string `json:"type"`
	Target          string `json:"target"`
	Proof           string `json:"proof"`
	Impact          string `json:"impact"`
	Recommendation  string `json:"recommendation"`
}

// CreateVulnerability 创建漏洞
func (h *VulnerabilityHandler) CreateVulnerability(c *gin.Context) {
	var req CreateVulnerabilityRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	vuln := &database.Vulnerability{
		ConversationID: req.ConversationID,
		Title:          req.Title,
		Description:    req.Description,
		Severity:       req.Severity,
		Status:         req.Status,
		Type:           req.Type,
		Target:         req.Target,
		Proof:          req.Proof,
		Impact:         req.Impact,
		Recommendation: req.Recommendation,
	}

	created, err := h.db.CreateVulnerability(vuln)
	if err != nil {
		h.logger.Error("创建漏洞失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, created)
}

// GetVulnerability 获取漏洞
func (h *VulnerabilityHandler) GetVulnerability(c *gin.Context) {
	id := c.Param("id")

	vuln, err := h.db.GetVulnerability(id)
	if err != nil {
		h.logger.Error("获取漏洞失败", zap.Error(err))
		c.JSON(http.StatusNotFound, gin.H{"error": "漏洞不存在"})
		return
	}

	c.JSON(http.StatusOK, vuln)
}

// ListVulnerabilitiesResponse 漏洞列表响应
type ListVulnerabilitiesResponse struct {
	Vulnerabilities []*database.Vulnerability `json:"vulnerabilities"`
	Total           int                       `json:"total"`
	Page            int                       `json:"page"`
	PageSize        int                       `json:"page_size"`
	TotalPages      int                       `json:"total_pages"`
}

// ListVulnerabilities 列出漏洞
func (h *VulnerabilityHandler) ListVulnerabilities(c *gin.Context) {
	limitStr := c.DefaultQuery("limit", "20")
	offsetStr := c.DefaultQuery("offset", "0")
	pageStr := c.Query("page")
	id := c.Query("id")
	conversationID := c.Query("conversation_id")
	severity := c.Query("severity")
	status := c.Query("status")

	limit, _ := strconv.Atoi(limitStr)
	offset, _ := strconv.Atoi(offsetStr)
	page := 1

	// 如果提供了page参数，优先使用page计算offset
	if pageStr != "" {
		if p, err := strconv.Atoi(pageStr); err == nil && p > 0 {
			page = p
			offset = (page - 1) * limit
		}
	}

	if limit <= 0 || limit > 100 {
		limit = 20
	}
	if offset < 0 {
		offset = 0
	}

	// 获取总数
	total, err := h.db.CountVulnerabilities(id, conversationID, severity, status)
	if err != nil {
		h.logger.Error("获取漏洞总数失败", zap.Error(err))
		// 继续执行，使用0作为总数
		total = 0
	}

	// 获取漏洞列表
	vulnerabilities, err := h.db.ListVulnerabilities(limit, offset, id, conversationID, severity, status)
	if err != nil {
		h.logger.Error("获取漏洞列表失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// 计算总页数
	totalPages := (total + limit - 1) / limit
	if totalPages == 0 {
		totalPages = 1
	}

	// 如果使用offset计算page，需要重新计算
	if pageStr == "" {
		page = (offset / limit) + 1
	}

	response := ListVulnerabilitiesResponse{
		Vulnerabilities: vulnerabilities,
		Total:           total,
		Page:            page,
		PageSize:        limit,
		TotalPages:      totalPages,
	}

	c.JSON(http.StatusOK, response)
}

// UpdateVulnerabilityRequest 更新漏洞请求
type UpdateVulnerabilityRequest struct {
	Title          string `json:"title"`
	Description    string `json:"description"`
	Severity       string `json:"severity"`
	Status         string `json:"status"`
	Type           string `json:"type"`
	Target         string `json:"target"`
	Proof          string `json:"proof"`
	Impact         string `json:"impact"`
	Recommendation string `json:"recommendation"`
}

// UpdateVulnerability 更新漏洞
func (h *VulnerabilityHandler) UpdateVulnerability(c *gin.Context) {
	id := c.Param("id")

	var req UpdateVulnerabilityRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取现有漏洞
	existing, err := h.db.GetVulnerability(id)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "漏洞不存在"})
		return
	}

	// 更新字段
	if req.Title != "" {
		existing.Title = req.Title
	}
	if req.Description != "" {
		existing.Description = req.Description
	}
	if req.Severity != "" {
		existing.Severity = req.Severity
	}
	if req.Status != "" {
		existing.Status = req.Status
	}
	if req.Type != "" {
		existing.Type = req.Type
	}
	if req.Target != "" {
		existing.Target = req.Target
	}
	if req.Proof != "" {
		existing.Proof = req.Proof
	}
	if req.Impact != "" {
		existing.Impact = req.Impact
	}
	if req.Recommendation != "" {
		existing.Recommendation = req.Recommendation
	}

	if err := h.db.UpdateVulnerability(id, existing); err != nil {
		h.logger.Error("更新漏洞失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// 返回更新后的漏洞
	updated, err := h.db.GetVulnerability(id)
	if err != nil {
		h.logger.Error("获取更新后的漏洞失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, updated)
}

// DeleteVulnerability 删除漏洞
func (h *VulnerabilityHandler) DeleteVulnerability(c *gin.Context) {
	id := c.Param("id")

	if err := h.db.DeleteVulnerability(id); err != nil {
		h.logger.Error("删除漏洞失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "删除成功"})
}

// GetVulnerabilityStats 获取漏洞统计
func (h *VulnerabilityHandler) GetVulnerabilityStats(c *gin.Context) {
	conversationID := c.Query("conversation_id")

	stats, err := h.db.GetVulnerabilityStats(conversationID)
	if err != nil {
		h.logger.Error("获取漏洞统计失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, stats)
}