package api

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

// handleSchemaGet returns the per-field schema, folded from counters the write
// path keeps exact (see schema.Indexer).
func (s *Server) handleSchemaGet(w http.ResponseWriter, r *http.Request) {
	if s.schemaIndexer == nil {
		http.Error(w, "schema indexer not running", http.StatusServiceUnavailable)
		return
	}
	snap, err := s.schemaIndexer.Snapshot(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/json")
	_ = json.NewEncoder(w).Encode(snap)
}

// handleSchemaRescan rebuilds the schema counters from a full read of the
// records and returns the result. The counters are exact by construction, so
// this is a repair tool, not routine: it runs as one write transaction, and
// every other write waits for it (minutes on a large store).
func (s *Server) handleSchemaRescan(w http.ResponseWriter, r *http.Request) {
	if s.schemaIndexer == nil {
		http.Error(w, "schema indexer not running", http.StatusServiceUnavailable)
		return
	}
	if err := s.storage.RebuildCounters(); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	snap, err := s.schemaIndexer.Snapshot(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	snap.Source = "rescan"
	w.Header().Set("Content-Type", "application/json")
	_ = json.NewEncoder(w).Encode(map[string]any{
		"published_events": 0,
		"schema":           snap,
	})
}