package server

import (
	"bytes"
	"errors"
	"fmt"
	"os"
	"testing"
	"time"

	"git.ctrlz.es/mgdelacroix/birthdaybot/model"
	"github.com/stretchr/testify/require"
)

func TestNotify(t *testing.T) {
	th := SetupTestHelper(t)
	defer th.TearDown()
	t.Run("should correctly use the notification services to notify", func(t *testing.T) {
		birthday := th.srv.birthdays[0]
		th.mockNotificationService.
			EXPECT().
			Notify(birthday, nil).
			Return(nil).
			Times(1)

		err := th.srv.Notify(birthday)
		require.NoError(t, err)
	})

	t.Run("should return an error if a service fails", func(t *testing.T) {
		mockErr := errors.New("failed to notify")
		birthday := th.srv.birthdays[0]
		th.mockNotificationService.
			EXPECT().
			Notify(birthday, nil).
			Return(mockErr).
			Times(1)

		err := th.srv.Notify(birthday)
		require.ErrorIs(t, err, mockErr)
	})
}

func TestTemplate(t *testing.T) {
	t.Run("template should work with birthday data", func(t *testing.T) {
		// create a template file and populate it
		f, err := os.CreateTemp("", "birthdaybot-config-")
		require.NoError(t, err)
		_, werr := fmt.Fprint(f, "My name is {{.Name}}")
		require.NoError(t, werr)
		require.NoError(t, f.Close())

		// create a test config and set the template
		config := testConfig(t)
		config.Birthdays.Template = f.Name()

		// create the test helper with the custom config
		th := SetupTestHelper(t, WithConfig(config))
		defer th.TearDown()

		birthday := &model.Birthday{Name: "Jane Doe"}
		expectedString := "My name is Jane Doe"

		var stringBuffer bytes.Buffer
		require.NoError(t, th.srv.tmpl.Execute(&stringBuffer, birthday))
		require.Equal(t, expectedString, stringBuffer.String())
	})

	t.Run("template should work with custom functions", func(t *testing.T) {
		// create a template file and populate it
		f, err := os.CreateTemp("", "birthdaybot-config-")
		require.NoError(t, err)
		_, werr := fmt.Fprint(f, "I'm getting {{getYearsOld .YearOfBirth}} years old")
		require.NoError(t, werr)
		require.NoError(t, f.Close())

		// create a test config and set the template
		config := testConfig(t)
		config.Birthdays.Template = f.Name()

		// create the test helper with the custom config
		th := SetupTestHelper(t, WithConfig(config))
		defer th.TearDown()

		birthday := &model.Birthday{YearOfBirth: 1980}
		expectedString := fmt.Sprintf("I'm getting %d years old", time.Now().Year()-birthday.YearOfBirth)

		var stringBuffer bytes.Buffer
		require.NoError(t, th.srv.tmpl.Execute(&stringBuffer, birthday))
		require.Equal(t, expectedString, stringBuffer.String())
	})
}