package service

import (
	"testing"

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

func TestDecodeBase64FileDataPreservesDeclaredMimeType(t *testing.T) {
	mimeType, payload, err := DecodeBase64FileData("data:application/pdf;base64,SGVsbG8=")

	require.NoError(t, err)
	require.Equal(t, "application/pdf", mimeType)
	require.Equal(t, "SGVsbG8=", payload)
}

func TestDecodeBase64ImageDataRejectsEmptyAndMalformedData(t *testing.T) {
	_, _, _, err := DecodeBase64ImageData("")
	require.Error(t, err)

	_, _, _, err = DecodeBase64ImageData("data:image/png;base64,not-base64")
	require.Error(t, err)
}

func TestDecodeBase64ImageDataParsesPNGDataURL(t *testing.T) {
	const pngBase64 = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIHWP4z8DwHwAFgAI/ScLxZQAAAABJRU5ErkJggg=="

	config, format, payload, err := DecodeBase64ImageData("data:image/png;base64," + pngBase64)

	require.NoError(t, err)
	require.Equal(t, 1, config.Width)
	require.Equal(t, 1, config.Height)
	require.Equal(t, "png", format)
	require.Equal(t, pngBase64, payload)

	mimeType, inferredPayload, err := DecodeBase64FileData(pngBase64)
	require.NoError(t, err)
	require.Equal(t, "image/png", mimeType)
	require.Equal(t, pngBase64, inferredPayload)
}

func TestDecodeBase64FileDataFallsBackToImageDetectionForBareData(t *testing.T) {
	_, _, err := DecodeBase64FileData("not-base64")
	require.Error(t, err)
}