// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package output

import (
	"testing"

	"github.com/spf13/hugo/media"

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

var ampType = Format{
	Name:      "AMP",
	MediaType: media.HTMLType,
	BaseName:  "index",
}

func TestLayout(t *testing.T) {

	for _, this := range []struct {
		name           string
		d              LayoutDescriptor
		hasTheme       bool
		layoutOverride string
		tp             Format
		expect         []string
	}{
		{"Home", LayoutDescriptor{Kind: "home"}, true, "", ampType,
			[]string{"index.amp.html", "index.html", "_default/list.amp.html", "_default/list.html", "theme/index.amp.html", "theme/index.html"}},
		{"Section", LayoutDescriptor{Kind: "section", Section: "sect1"}, false, "", ampType,
			[]string{"section/sect1.amp.html", "section/sect1.html"}},
		{"Taxonomy", LayoutDescriptor{Kind: "taxonomy", Section: "tag"}, false, "", ampType,
			[]string{"taxonomy/tag.amp.html", "taxonomy/tag.html"}},
		{"Taxonomy term", LayoutDescriptor{Kind: "taxonomyTerm", Section: "categories"}, false, "", ampType,
			[]string{"taxonomy/categories.terms.amp.html", "taxonomy/categories.terms.html", "_default/terms.amp.html"}},
		{"Page", LayoutDescriptor{Kind: "page"}, true, "", ampType,
			[]string{"_default/single.amp.html", "_default/single.html", "theme/_default/single.amp.html"}},
		{"Page with layout", LayoutDescriptor{Kind: "page", Layout: "mylayout"}, false, "", ampType,
			[]string{"_default/mylayout.amp.html", "_default/mylayout.html"}},
		{"Page with layout and type", LayoutDescriptor{Kind: "page", Layout: "mylayout", Type: "myttype"}, false, "", ampType,
			[]string{"myttype/mylayout.amp.html", "myttype/mylayout.html", "_default/mylayout.amp.html"}},
		{"Page with layout and type with subtype", LayoutDescriptor{Kind: "page", Layout: "mylayout", Type: "myttype/mysubtype"}, false, "", ampType,
			[]string{"myttype/mysubtype/mylayout.amp.html", "myttype/mysubtype/mylayout.html", "myttype/mylayout.amp.html"}},
		{"Page with overridden layout", LayoutDescriptor{Kind: "page", Layout: "mylayout", Type: "myttype"}, false, "myotherlayout", ampType,
			[]string{"myttype/myotherlayout.amp.html", "myttype/myotherlayout.html"}},
		// RSS
		{"RSS Home with theme", LayoutDescriptor{Kind: "home"}, true, "", RSSFormat,
			[]string{"rss.xml", "_default/rss.xml", "theme/rss.xml", "theme/_default/rss.xml", "_internal/_default/rss.xml"}},
		{"RSS Section", LayoutDescriptor{Kind: "section", Section: "sect1"}, false, "", RSSFormat,
			[]string{"section/sect1.rss.xml", "_default/rss.xml", "rss.xml", "_internal/_default/rss.xml"}},
		{"RSS Taxonomy", LayoutDescriptor{Kind: "taxonomy", Section: "tag"}, false, "", RSSFormat,
			[]string{"taxonomy/tag.rss.xml", "_default/rss.xml", "rss.xml", "_internal/_default/rss.xml"}},
		{"RSS Taxonomy term", LayoutDescriptor{Kind: "taxonomyTerm", Section: "tag"}, false, "", RSSFormat,
			[]string{"taxonomy/tag.terms.rss.xml", "_default/rss.xml", "rss.xml", "_internal/_default/rss.xml"}},
	} {
		t.Run(this.name, func(t *testing.T) {
			l := NewLayoutHandler(this.hasTheme)

			layouts, err := l.For(this.d, this.layoutOverride, this.tp)

			require.NoError(t, err)
			require.NotNil(t, layouts)
			require.True(t, len(layouts) >= len(this.expect))
			// Not checking the complete list for now ...
			require.Equal(t, this.expect, layouts[:len(this.expect)])

			if !this.hasTheme {
				for _, layout := range layouts {
					require.NotContains(t, layout, "theme")
				}
			}
		})
	}

	l := NewLayoutHandler(false)
	_, err := l.For(LayoutDescriptor{Kind: "taxonomyTerm", Section: "tag"}, "override", RSSFormat)
	require.Error(t, err)

}

func BenchmarkLayout(b *testing.B) {
	descriptor := LayoutDescriptor{Kind: "taxonomyTerm", Section: "categories"}
	l := NewLayoutHandler(false)

	for i := 0; i < b.N; i++ {
		layouts, err := l.For(descriptor, "", HTMLFormat)
		require.NoError(b, err)
		require.NotEmpty(b, layouts)
	}
}
