package golden

import (
	"flag"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"

	"github.com/gruntwork-io/terratest/modules/helm"
)

var update = flag.Bool("update", false, "update golden test output files")

func TestHelmRender(t *testing.T) {
	files, err := os.ReadDir("./ci")
	if err != nil {
		t.Fatal(err)
	}

	for _, f := range files {
		if !f.IsDir() && strings.HasSuffix(f.Name(), ".yaml") && !strings.HasSuffix(f.Name(), ".golden.yaml") {
			// Render this values.yaml file
			output := helm.RenderTemplate(t,
				&helm.Options{
					ValuesFiles: []string{"ci/" + f.Name()},
				},
				"../dragonfly",
				"test",
				nil,
			)

			goldenFile := "ci/" + strings.TrimSuffix(f.Name(), filepath.Ext(".yaml")) + ".golden.yaml"
			regex := regexp.MustCompile(`\s+helm.sh/chart:\s+.*`)
			bytes := regex.ReplaceAll([]byte(output), []byte(""))

			output = fmt.Sprintf("%s\n", string(bytes))

			if *update {
				err := ioutil.WriteFile(goldenFile, []byte(output), 0644)
				if err != nil {
					t.Fatal(err)
				}
			}

			expected, err := ioutil.ReadFile(goldenFile)
			if err != nil {
				t.Fatal(err)
			}

			if string(expected) != output {
				t.Fatalf("Expected %s, but got %s\n. Update golden files by running `go test -v ./... -update`", string(expected), output)
			}
		}

	}
}