package engine

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"
)

// The engine's REAL reply, copied from a running instance. The point of this
// test is the `"frozen": false` inside `paths`: Health.Paths was
// map[string]string, so decoding failed on that one bool, and because a failed
// decode fails the whole document a working engine was reported unreachable -
// red tray, and a heartbeat carrying neither the model nor the cameras, so head
// office showed "0 of 0 cameras" for a site that was watching one.
const realHealthBody = `{"status":"ok","recognition_model":"w600k_r50",
"paths":{"frozen":false,"install_root":"/opt/behavision","state_root":"/var/behavision",
"config":"/var/behavision/config/default.yaml","data_dir":"/var/behavision/data",
"models_dir":"/var/behavision/models"},"cameras":{"cam1":true},"uptime_seconds":42.5}`

func TestHealthDecodesWhatTheEngineActuallySends(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(realHealthBody))
	}))
	defer srv.Close()

	s := New(Options{HealthURL: srv.URL})
	h, err := s.Health(context.Background())
	if err != nil {
		t.Fatalf("the engine's own reply did not decode: %v", err)
	}
	if h.RecognitionModel != "w600k_r50" {
		t.Errorf("model = %q", h.RecognitionModel)
	}
	// The two fields the heartbeat carries. Losing these is what made a
	// working site look empty at head office.
	if up, ok := h.Cameras["cam1"]; !ok || !up {
		t.Errorf("cameras = %v, want cam1 connected", h.Cameras)
	}
	if h.Paths.StateRoot != "/var/behavision" || h.Paths.Frozen {
		t.Errorf("paths = %+v", h.Paths)
	}
}