package main

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestReadHostPubLine(t *testing.T) {
	dir := t.TempDir()
	p := dir + "/k.pub"
	if err := writeFileAtomic(p, []byte("ecdsa-sha2-nistp256 AAAAB3Nz root@fleet\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	line, err := readHostPubLine(p)
	if err != nil {
		t.Fatal(err)
	}
	if line != "ecdsa-sha2-nistp256 AAAAB3Nz root@fleet" {
		t.Errorf("got %q", line)
	}
	if err := writeFileAtomic(p, []byte("garbage\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := readHostPubLine(p); err == nil {
		t.Error("expected error on malformed key")
	}
}

func TestSplitPrincipals(t *testing.T) {
	got := splitPrincipals(" a, b ,,c ")
	if len(got) != 3 || got[0] != "a" || got[1] != "b" || got[2] != "c" {
		t.Errorf("got %v", got)
	}
	if len(splitPrincipals("")) != 0 {
		t.Error("empty string should yield no principals")
	}
}

func TestParseHandle(t *testing.T) {
	h, err := parseHandle("0x81000100")
	if err != nil || uint32(h) != 0x81000100 {
		t.Fatalf("h=%#x err=%v", uint32(h), err)
	}
	if _, err := parseHandle("nothex"); err == nil {
		t.Error("expected error")
	}
}

func TestRequestHostCert(t *testing.T) {
	const certLine = "ecdsa-sha2-nistp256-cert-v01@openssh.com AAAAcert host.fleet.lab"
	var gotReq hostCertRequest
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer r.Body.Close()
		raw, _ := io.ReadAll(r.Body)
		_ = json.Unmarshal(raw, &gotReq)
		writeJSON(w, http.StatusOK, hostCertResponse{Cert: certLine})
	}))
	defer srv.Close()

	got, err := requestHostCert(srv.Client(), srv.URL, "ecdsa-sha2-nistp256 AAAA host", []string{"host", "host.fleet.lab"}, "host.fleet.lab")
	if err != nil {
		t.Fatalf("requestHostCert: %v", err)
	}
	if got != certLine {
		t.Errorf("cert = %q", got)
	}
	if gotReq.PublicKey != "ecdsa-sha2-nistp256 AAAA host" || gotReq.KeyID != "host.fleet.lab" || len(gotReq.Principals) != 2 {
		t.Errorf("broker received unexpected request: %+v", gotReq)
	}
}

func TestRequestHostCertErrorBody(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		writeJSON(w, http.StatusForbidden, hostCertResponse{Error: "not enrolled"})
	}))
	defer srv.Close()
	if _, err := requestHostCert(srv.Client(), srv.URL, "ecdsa-sha2-nistp256 AAAA host", []string{"host"}, "host"); err == nil || !strings.Contains(err.Error(), "not enrolled") {
		t.Errorf("want error carrying broker message, got %v", err)
	}
}

// writeJSON mirrors the broker's small JSON helper for the test server.
func writeJSON(w http.ResponseWriter, code int, v any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(code)
	_ = json.NewEncoder(w).Encode(v)
}