package server

import (
	"net/http"
	"path/filepath"
	"strconv"
)

func (s *Server) repoRoot() string {
	if s.cfg != nil && s.cfg.DataDir != "" {
		// DataDir 形如 ./data/dev；工作区路径形如 data/dev/workspaces/...，相对仓库根目录
		return filepath.Clean(filepath.Join(s.cfg.DataDir, "..", ".."))
	}
	return "."
}

// handleListProjectWorkflowDocuments 列出项目工作流受控文档。
func (s *Server) handleListProjectWorkflowDocuments(w http.ResponseWriter, r *http.Request) {
	projectID, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
	if err != nil || projectID <= 0 {
		http.Error(w, "invalid project id", http.StatusBadRequest)
		return
	}
	category := r.URL.Query().Get("category")
	if category != "" && category != "workflow" {
		http.Error(w, "unsupported category", http.StatusBadRequest)
		return
	}

	user, ok := s.requireProjectAccess(w, r, projectID)
	if !ok {
		return
	}

	if s.svc == nil || s.svc.DocGov() == nil {
		http.Error(w, "docgov engine not initialized", http.StatusServiceUnavailable)
		return
	}

	docs, err := s.svc.DocGov().ListWorkflowDocumentsByProject(r.Context(), projectID)
	if err != nil {
		http.Error(w, "list project documents failed: "+err.Error(), http.StatusInternalServerError)
		return
	}
	docs = s.filterWorkflowDocsByStageAccess(r.Context(), projectID, user.ID, docs)
	writeJSONResponse(w, http.StatusOK, docs)
}

// handleDocGovGetDocumentContent 读取受控文档 Markdown 正文。
func (s *Server) handleDocGovGetDocumentContent(w http.ResponseWriter, r *http.Request) {
	docID := r.PathValue("doc_id")
	if docID == "" {
		http.Error(w, "doc_id required", http.StatusBadRequest)
		return
	}

	if s.svc == nil || s.svc.DocGov() == nil {
		http.Error(w, "docgov engine not initialized", http.StatusServiceUnavailable)
		return
	}

	docRec, err := s.svc.DocGov().GetDocument(r.Context(), docID)
	if err != nil || docRec == nil {
		http.Error(w, "document not found", http.StatusNotFound)
		return
	}
	user, ok := s.requireProjectAccess(w, r, docRec.ProjectID)
	if !ok {
		return
	}
	if !s.allowWorkflowDocTaskAccess(r.Context(), docRec.ProjectID, user.ID, docRec.TaskKey) {
		http.Error(w, `{"error":"WORKFLOW_ACCESS_DENIED","message":"无权访问该阶段文档"}`, http.StatusForbidden)
		return
	}

	content, err := s.svc.DocGov().ReadDocumentContent(r.Context(), docID, s.repoRoot())
	if err != nil {
		http.Error(w, "read document content failed: "+err.Error(), http.StatusNotFound)
		return
	}

	if inm := r.Header.Get("If-None-Match"); inm != "" && inm == content.ContentSHA256 {
		w.WriteHeader(http.StatusNotModified)
		return
	}
	w.Header().Set("ETag", content.ContentSHA256)
	writeJSONResponse(w, http.StatusOK, content)
}