package templtest

import (
	_ "embed"
	"errors"
	"regexp"
	"strings"
	"testing"

	"git.buddy.wtf/lib/tmpl"
	"github.com/google/go-cmp/cmp"
	"github.com/stretchr/testify/assert"
)

//go:embed expect/index-simple.html
var expectdIndexHTML string

func TestHTML(t *testing.T) {
	type testcase struct {
		Name string
		tmpl.Templates
		Expected string
		Template string
		Data     interface{}
		Err      bool
	}

	tt := []testcase{
		{
			Name:     "get template by name",
			Expected: expectdIndexHTML,
			Template: "index",
			Data:     "test",
			Templates: tmpl.Templates{
				FS:     data,
				Root:   "data",
				Suffix: "html.tmpl",
				Funcs: map[string]interface{}{
					"upper": strings.ToUpper,
				},
			},
		},

		{
			Name:      "error on invalid template",
			Err:       true,
			Template:  "borked",
			Templates: tmpl.Templates{FS: data, Suffix: "invalid"},
		},

		{
			Name:     "error calling invalid template",
			Template: "borked",
			Templates: tmpl.Templates{
				FS:     data,
				Suffix: "template",
				Funcs: map[string]interface{}{
					"return_error": func() (string, error) {
						return "invalid", errors.New("error running template")
					},
				},
			},
		},
	}

	for _, tc := range tt {
		tc := tc
		t.Run(tc.Name, func(t *testing.T) {
			t.Parallel()
			a := assert.New(t)
			template, err := tc.Templates.HTML(tc.Template)
			if tc.Err {
				a.Error(err)
				return
			} else {
				a.NoError(err)
			}
			actual := tmpl.String(template, tc.Data)
			a.Empty(cmp.Diff(singlespace(actual), singlespace(tc.Expected)))
		})
	}
}

var spacesRegex = regexp.MustCompile(`\s+`)

func singlespace(in string) string {
	return strings.Join(spacesRegex.Split(in, -1), " ")
}