package server

import (
	"encoding/json"
	"net/http"

	"git.mchus.pro/mchus/logpile/internal/exporter"
	"git.mchus.pro/mchus/logpile/internal/models"
	"git.mchus.pro/mchus/logpile/internal/topology"
)

func currentTopologyDocument(result *models.AnalysisResult) (*models.TopologyDocument, error) {
	if result == nil || result.Hardware == nil {
		return &models.TopologyDocument{Version: topology.ContractVersion}, nil
	}
	snapshot, err := exporter.ConvertToReanimator(result)
	if err != nil {
		return nil, err
	}
	return topology.Build(snapshot, result.TopologyEvidence), nil
}

func (s *Server) handleTopologyCurrent(w http.ResponseWriter, r *http.Request) {
	doc, err := currentTopologyDocument(s.GetResult())
	if err != nil {
		s.htmlError(w, "failed to build topology", http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	_, _ = w.Write(topology.RenderHTML(doc))
}

func (s *Server) handleGetTopology(w http.ResponseWriter, r *http.Request) {
	doc, err := currentTopologyDocument(s.GetResult())
	if err != nil {
		jsonError(w, "Failed to build topology", http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	enc := json.NewEncoder(w)
	enc.SetIndent("", "  ")
	_ = enc.Encode(doc)
}