package classes

import (
	"testing"

	"git.golem15.com/golem15/sm-seo-plugin/models"
)

// TestTemplates: rendering fills the three placeholders, collapses spaces
// and trims separators an empty placeholder leaves; an unknown placeholder
// is refused when the template is saved.
func TestTemplates(t *testing.T) {
	vars := TemplateVars{Title: "Grzyby leśne", Description: "O grzybach", Site: "Atlas"}
	for _, tc := range []struct {
		name, tpl string
		vars      TemplateVars
		want      string
	}{
		{"title and site", "%title% | %site%", vars, "Grzyby leśne | Atlas"},
		{"description", "%description% – %site%", vars, "O grzybach – Atlas"},
		{"every placeholder twice", "%title% %title% %site%", vars, "Grzyby leśne Grzyby leśne Atlas"},
		{"an empty site leaves no separator", "%title% | %site%", TemplateVars{Title: "About"}, "About"},
		{"an empty title leaves no separator", "%title% · %site%", TemplateVars{Site: "Atlas"}, "Atlas"},
		{"separators of every kind are trimmed", "%title% — : , %site%", TemplateVars{Title: "X"}, "X"},
		{"inner separators stay", "%title% | Blog | %site%", TemplateVars{Title: "X", Site: "Y"}, "X | Blog | Y"},
		{"runs of spaces collapse", "  %title%   \t  %site%  ", vars, "Grzyby leśne Atlas"},
		{"an empty template renders nothing", "", vars, ""},
		{"a blank template renders nothing", "   ", vars, ""},
		{"text without placeholders", "Static title", vars, "Static title"},
		{"an unknown placeholder renders as written", "%title% %author%", vars, "Grzyby leśne %author%"},
		{"everything empty", "%title% | %site%", TemplateVars{}, ""},
	} {
		t.Run(tc.name, func(t *testing.T) {
			if got := RenderTemplate(tc.tpl, tc.vars); got != tc.want {
				t.Fatalf("RenderTemplate(%q) = %q, want %q", tc.tpl, got, tc.want)
			}
		})
	}

	for _, tc := range []struct {
		tpl, unknown string
	}{
		{"%title% | %site%", ""},
		{"%description%", ""},
		{"", ""},
		{"100% sure", ""},
		{"%author% | %site%", "%author%"},
		{"%title% %Title%", "%Title%"},
		{"%%", "%%"},
		{"%site_name%", "%site_name%"},
		{"%title% %date% %page%", "%date%"},
	} {
		if got := models.UnknownPlaceholder(tc.tpl); got != tc.unknown {
			t.Errorf("UnknownPlaceholder(%q) = %q, want %q", tc.tpl, got, tc.unknown)
		}
		problems := models.TemplateProblems(tc.tpl)
		if tc.unknown == "" && problems != nil {
			t.Errorf("TemplateProblems(%q) = %+v", tc.tpl, problems)
		}
		if tc.unknown != "" && (len(problems) != 1 || problems[0].Key != "golem15.seo::lang.settings.template_unknown" || problems[0].Params["placeholder"] != tc.unknown) {
			t.Errorf("TemplateProblems(%q) = %+v", tc.tpl, problems)
		}
	}

	refused := models.Settings{TitleTemplate: "%title% | %brand%", HomeTemplate: "%site% %x%"}.Problems()
	if len(refused["title_template"]) != 1 || len(refused["home_template"]) != 1 {
		t.Fatalf("settings problems = %+v", refused)
	}
	if ok := (models.Settings{TitleTemplate: "%title% | %site%", HomeTemplate: "%site%"}).Problems(); len(ok) != 0 {
		t.Fatalf("valid templates refused: %+v", ok)
	}
	if len(models.KnownPlaceholders) != 3 || PlaceholderTitle != models.KnownPlaceholders[0] || PlaceholderDescription != models.KnownPlaceholders[1] || PlaceholderSite != models.KnownPlaceholders[2] {
		t.Fatalf("the rendered and the validated placeholders differ: %v", models.KnownPlaceholders)
	}
}