package handler

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

	"cyberstrike-ai/internal/database"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// ProjectHandler 项目管理处理器。
type ProjectHandler struct {
	db     *database.DB
	logger *zap.Logger
}

// NewProjectHandler 创建项目管理处理器。
func NewProjectHandler(db *database.DB, logger *zap.Logger) *ProjectHandler {
	return &ProjectHandler{db: db, logger: logger}
}

type createProjectRequest struct {
	Name        string `json:"name" binding:"required"`
	Description string `json:"description"`
	ScopeJSON   string `json:"scope_json"`
	Status      string `json:"status"`
}

type updateProjectRequest struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	ScopeJSON   string `json:"scope_json"`
	Status      string `json:"status"`
	Pinned      *bool  `json:"pinned"`
}

// CreateProject POST /api/projects
func (h *ProjectHandler) CreateProject(c *gin.Context) {
	var req createProjectRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	p := &database.Project{
		Name:        strings.TrimSpace(req.Name),
		Description: req.Description,
		ScopeJSON:   req.ScopeJSON,
		Status:      strings.TrimSpace(req.Status),
	}
	created, err := h.db.CreateProject(p)
	if err != nil {
		h.logger.Error("创建项目失败", zap.Error(err))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, created)
}

// ListProjects GET /api/projects
func (h *ProjectHandler) ListProjects(c *gin.Context) {
	status := c.Query("status")
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "200"))
	offset, _ := strconv.Atoi(c.Query("offset"))
	list, err := h.db.ListProjects(status, limit, offset)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	if list == nil {
		list = []*database.Project{}
	}
	c.JSON(http.StatusOK, list)
}

// GetProject GET /api/projects/:id
func (h *ProjectHandler) GetProject(c *gin.Context) {
	p, err := h.db.GetProject(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "项目不存在"})
		return
	}
	c.JSON(http.StatusOK, p)
}

// UpdateProject PUT /api/projects/:id
func (h *ProjectHandler) UpdateProject(c *gin.Context) {
	id := c.Param("id")
	p, err := h.db.GetProject(id)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "项目不存在"})
		return
	}
	var req updateProjectRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if s := strings.TrimSpace(req.Name); s != "" {
		p.Name = s
	}
	if req.Description != "" || c.Request.ContentLength > 0 {
		p.Description = req.Description
	}
	if req.ScopeJSON != "" || c.GetHeader("Content-Type") != "" {
		p.ScopeJSON = req.ScopeJSON
	}
	if s := strings.TrimSpace(req.Status); s != "" {
		p.Status = s
	}
	if req.Pinned != nil {
		p.Pinned = *req.Pinned
	}
	if err := h.db.UpdateProject(p); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, p)
}

// DeleteProject DELETE /api/projects/:id
func (h *ProjectHandler) DeleteProject(c *gin.Context) {
	if err := h.db.DeleteProject(c.Param("id")); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true})
}

type upsertFactRequest struct {
	FactKey                string `json:"fact_key" binding:"required"`
	Category               string `json:"category"`
	Summary                string `json:"summary" binding:"required"`
	Body                   string `json:"body"`
	Confidence             string `json:"confidence"`
	Pinned                 bool   `json:"pinned"`
	RelatedVulnerabilityID string `json:"related_vulnerability_id"`
}

// ListFacts GET /api/projects/:id/facts （fact_key 查询参数可获取单条详情）
func (h *ProjectHandler) ListFacts(c *gin.Context) {
	projectID := c.Param("id")
	if key := strings.TrimSpace(c.Query("fact_key")); key != "" {
		f, err := h.db.GetProjectFactByKey(projectID, key)
		if err != nil {
			c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
			return
		}
		c.JSON(http.StatusOK, f)
		return
	}
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "100"))
	offset, _ := strconv.Atoi(c.Query("offset"))
	filter := database.ProjectFactListFilter{
		Category:   c.Query("category"),
		Confidence: c.Query("confidence"),
		Search:     c.Query("search"),
	}
	list, err := h.db.ListProjectFacts(projectID, filter, limit, offset)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	if list == nil {
		list = []*database.ProjectFact{}
	}
	c.JSON(http.StatusOK, list)
}

// CreateFact POST /api/projects/:id/facts
func (h *ProjectHandler) CreateFact(c *gin.Context) {
	var req upsertFactRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	f := &database.ProjectFact{
		ProjectID:              c.Param("id"),
		FactKey:                req.FactKey,
		Category:               req.Category,
		Summary:                req.Summary,
		Body:                   req.Body,
		Confidence:             req.Confidence,
		Pinned:                 req.Pinned,
		RelatedVulnerabilityID: req.RelatedVulnerabilityID,
	}
	created, err := h.db.UpsertProjectFact(f)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, created)
}

// UpdateFact PUT /api/projects/:id/facts/:factId
func (h *ProjectHandler) UpdateFact(c *gin.Context) {
	existing, err := h.db.GetProjectFact(c.Param("factId"))
	if err != nil || existing.ProjectID != c.Param("id") {
		c.JSON(http.StatusNotFound, gin.H{"error": "事实不存在"})
		return
	}
	var req upsertFactRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if k := strings.TrimSpace(req.FactKey); k != "" {
		existing.FactKey = k
	}
	if req.Category != "" {
		existing.Category = req.Category
	}
	if req.Summary != "" {
		existing.Summary = req.Summary
	}
	existing.Body = req.Body
	if req.Confidence != "" {
		existing.Confidence = req.Confidence
	}
	existing.Pinned = req.Pinned
	existing.RelatedVulnerabilityID = req.RelatedVulnerabilityID
	updated, err := h.db.UpsertProjectFact(existing)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, updated)
}

// DeleteFact DELETE /api/projects/:id/facts/:factId
func (h *ProjectHandler) DeleteFact(c *gin.Context) {
	existing, err := h.db.GetProjectFact(c.Param("factId"))
	if err != nil || existing.ProjectID != c.Param("id") {
		c.JSON(http.StatusNotFound, gin.H{"error": "事实不存在"})
		return
	}
	if err := h.db.DeleteProjectFact(existing.ID); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true})
}

type deprecateFactRequest struct {
	FactKey string `json:"fact_key" binding:"required"`
}

// DeprecateFact POST /api/projects/:id/facts/deprecate
func (h *ProjectHandler) DeprecateFact(c *gin.Context) {
	var req deprecateFactRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if err := h.db.DeprecateProjectFact(c.Param("id"), req.FactKey); err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true})
}