package banner_test

import (
	"bytes"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/webhooker/internal/banner"
)

// TestCredentials_IsFindableByEye pins the properties that make the
// block worth having: rules above and below it, the two fields on
// their own lines, and blank lines separating it from whatever the
// surrounding log wrote.
func TestCredentials_IsFindableByEye(t *testing.T) {
	t.Parallel()

	var out bytes.Buffer

	require.NoError(t, banner.Credentials(
		&out, "HEADLINE", "admin", "s3cret", "NOTE",
	))

	got := out.String()
	lines := strings.Split(strings.Trim(got, "\n"), "\n")

	require.GreaterOrEqual(t, len(lines), 3)
	assert.Equal(t, lines[0], lines[len(lines)-1], "rules must match")
	assert.Greater(
		t, len(lines[0]), 40, "the rule must be visible at a glance",
	)
	assert.Equal(t, strings.Repeat("=", len(lines[0])), lines[0])

	assert.Contains(t, got, "\n    username: admin\n")
	assert.Contains(t, got, "\n    password: s3cret\n")
	assert.Contains(t, got, "HEADLINE")
	assert.Contains(t, got, "NOTE")
	assert.True(t, strings.HasPrefix(got, "\n"))
}

// failingWriter reports the write error a banner must not swallow: it
// is the one copy of a password that will never be shown again.
type failingWriter struct{}

func (failingWriter) Write([]byte) (int, error) {
	return 0, assert.AnError
}

func TestCredentials_ReportsAWriteFailure(t *testing.T) {
	t.Parallel()

	err := banner.Credentials(
		failingWriter{}, "HEADLINE", "admin", "s3cret", "NOTE",
	)

	require.ErrorIs(t, err, assert.AnError)
}