package observability

import (
	"os"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestMain(m *testing.M) {
	os.Exit(m.Run())
}
func TestLogIfStateChanged(t *testing.T) {
	tests := map[string]struct {
		initialState bool
		newState     bool
		expectLog    bool
	}{
		"Changed": {
			initialState: true,
			newState:     false,
			expectLog:    true,
		},
		"NotChanged": {
			initialState: true,
			newState:     true,
			expectLog:    false,
		},
	}

	for name, tc := range tests {
		t.Run(name, func(t *testing.T) {
			stateLogger := StateLogger{
				lastState: tc.initialState,
				log:       &spyLogger{},
			}

			stateLogger.LogIfStateChanged(tc.newState)
			assert.Equal(t, tc.newState, stateLogger.lastState)
			logger := stateLogger.log.(*spyLogger)
			assert.Equal(t, tc.expectLog, logger.hasLogged)
		})
	}
}

type spyLogger struct {
	hasLogged bool
}

func (s *spyLogger) Info(_ string, _ ...interface{}) {
	s.hasLogged = true
}