package cas

import (
	"io"
	"net/http"
	"strings"

	"git.send.nrw/sendnrw/decent-websrv/internal/mesh"
	"git.send.nrw/sendnrw/decent-websrv/internal/security"
)

type MeshFetcher struct {
	Ring     *mesh.Rendezvous
	HTTP     *http.Client
	Verifier *security.MeshVerifier
	Self     mesh.NodeInfo
}

func (f *MeshFetcher) FetchTo(hash string, w http.ResponseWriter) bool {
	owners := f.Ring.Owners(hash, 3)
	if len(owners) == 0 {
		return false
	}
	for _, id := range owners {
		if id == f.Self.NodeID {
			continue
		}
		// resolve id to node
		// In this minimal starter we assume Mesh URL can be derived externally; in a fuller impl, pass a Catalog here.
		// For simplicity, try owner as URL directly if it's already a URL; otherwise skip.
		u := id // If your ring holds IDs, you should map ID->Node (MeshURL); keep simple here.
		if !strings.HasPrefix(u, "http") {
			continue
		}
		path := "/_mesh/cas/" + hash
		req, _ := http.NewRequest(http.MethodGet, strings.TrimRight(u, "/")+path, nil)
		f.Verifier.SignOutgoing(req, "", f.Self.NodeID) // sign GET with empty body-hash
		resp, err := f.HTTP.Do(req)
		if err != nil {
			continue
		}
		if resp.StatusCode == 200 {
			defer resp.Body.Close()
			io.Copy(w, resp.Body)
			return true
		}
		resp.Body.Close()
	}
	return false
}