package admin_test

import (
	"encoding/json"
	"strings"
	"testing"

	"git.wntrmute.dev/kyle/crossbar/internal/store"
)

// An empty usage table is an empty JSON array, not null: clients iterate it.
func TestUsageEmptyIsAnArray(t *testing.T) {
	r := newRig(t)
	for _, q := range []string{"/_crossbar/usage", "/_crossbar/usage?by=host", "/_crossbar/usage?by=model&since=1h"} {
		rec := r.do(t, "GET", q, "")
		if rec.Code != 200 {
			t.Fatalf("%s: %d", q, rec.Code)
		}
		if strings.TrimSpace(rec.Body.String()) != "[]" {
			t.Errorf("%s: body %q, want []", q, rec.Body.String())
		}
		var rows []store.UsageRow
		if err := json.Unmarshal(rec.Body.Bytes(), &rows); err != nil || rows == nil || len(rows) != 0 {
			t.Errorf("%s: decoded %v %v, want an empty non-nil slice", q, rows, err)
		}
	}
	rec := r.do(t, "GET", "/_crossbar/usage?by=route", "", "Accept", "text/plain")
	if rec.Code != 200 || !strings.Contains(rec.Body.String(), "key") {
		t.Errorf("text form with no rows must still print the header: %d %q", rec.Code, rec.Body.String())
	}
}