package yamlutil

import (
	"os"
	"path/filepath"
	"reflect"
	"testing"

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

func TestLoadYamlFile(t *testing.T) {
	type structA struct {
		A int
		B string
	}

	tests := []struct {
		name string
		body string
		want any
	}{
		{
			name: "empty body",
			body: "",
			want: structA{},
		},
		{
			name: "all comments",
			body: `# foo
			# bar`,
			want: structA{},
		},
		{
			name: "success",
			body: "a: 1\nb: foo\n",
			want: structA{A: 1, B: "foo"},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			var (
				dir   = t.TempDir()
				path  = filepath.Join(dir, "f.yaml")
				intoV = reflect.New(reflect.TypeOf(test.want))
				into  = intoV.Interface()
			)

			require.NoError(t, os.WriteFile(path, []byte(test.body), 0444))
			assert.NoError(t, LoadYamlFile(into, path))
			assert.Equal(t, test.want, intoV.Elem().Interface())
		})
	}
}