// Copyright 2025 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 collections_test

import (
	"context"
	"fmt"
	"strings"
	"testing"

	"github.com/gohugoio/hugo/hugolib"
	"github.com/gohugoio/hugo/resources/page"
	"github.com/gohugoio/hugo/tpl/collections"
)

// Issue 9585
func TestApplyWithContext(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
baseURL = 'http://example.com/'
-- layouts/home.html --
{{ apply (seq 3) "partial" "foo.html"}}
-- layouts/_partials/foo.html --
{{ return "foo"}}
  `

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", `
	[foo foo foo]
`)
}

func TestApplyBuiltInIssue13418(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
baseURL = 'http://example.com/'
-- layouts/home.html --
len: {{ apply (slice "hello") "len" "." }}
not: {{ apply (slice "hello") "not" "." }}
`
	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", "len: [5]", "not: [false]")
}

// Issue 9865
func TestSortStable(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
-- layouts/home.html --
{{ $values := slice (dict "a" 1 "b" 2) (dict "a" 3 "b" 1) (dict "a" 2 "b" 0) (dict "a" 1 "b" 0) (dict "a" 3 "b" 1) (dict "a" 2 "b" 2) (dict "a" 2 "b" 1) (dict "a" 0 "b" 3) (dict "a" 3 "b" 3) (dict "a" 0 "b" 0) (dict "a" 0 "b" 0) (dict "a" 2 "b" 0) (dict "a" 1 "b" 2) (dict "a" 1 "b" 1) (dict "a" 3 "b" 0) (dict "a" 2 "b" 0) (dict "a" 3 "b" 0) (dict "a" 3 "b" 0) (dict "a" 3 "b" 0) (dict "a" 3 "b" 1) }}
Asc:  {{ sort (sort $values "b" "asc") "a" "asc" }}
Desc: {{ sort (sort $values "b" "desc") "a" "desc" }}

  `

	for range 4 {

		b := hugolib.Test(t, files)

		b.AssertFileContent("public/index.html", `
Asc:  [map[a:0 b:0] map[a:0 b:0] map[a:0 b:3] map[a:1 b:0] map[a:1 b:1] map[a:1 b:2] map[a:1 b:2] map[a:2 b:0] map[a:2 b:0] map[a:2 b:0] map[a:2 b:1] map[a:2 b:2] map[a:3 b:0] map[a:3 b:0] map[a:3 b:0] map[a:3 b:0] map[a:3 b:1] map[a:3 b:1] map[a:3 b:1] map[a:3 b:3]]
Desc: [map[a:3 b:3] map[a:3 b:1] map[a:3 b:1] map[a:3 b:1] map[a:3 b:0] map[a:3 b:0] map[a:3 b:0] map[a:3 b:0] map[a:2 b:2] map[a:2 b:1] map[a:2 b:0] map[a:2 b:0] map[a:2 b:0] map[a:1 b:2] map[a:1 b:2] map[a:1 b:1] map[a:1 b:0] map[a:0 b:3] map[a:0 b:0] map[a:0 b:0]]
`)

	}
}

// Issue #11004.
func TestAppendSliceToASliceOfSlices(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
-- layouts/home.html --
{{ $obj := slice (slice "a") }}
{{ $obj = $obj | append (slice "b") }}
{{ $obj = $obj | append (slice "c") }}

{{ $obj }}

  `

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", "[[a] [b] [c]]")
}

func TestAppendNilToSlice(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
-- layouts/home.html --
{{ $obj := (slice "a") }}
{{ $obj = $obj | append nil }}

{{ $obj }}


  `

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", "[a &lt;nil&gt;]")
}

func TestAppendNilsToSliceWithNils(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
-- layouts/home.html --
{{ $obj := (slice "a" nil "c") }}
{{ $obj = $obj | append nil }}

{{ $obj }}


  `

	for range 4 {

		b := hugolib.Test(t, files)

		b.AssertFileContent("public/index.html", "[a &lt;nil&gt; c &lt;nil&gt;]")

	}
}

// Issue 11234.
func TestWhereWithWordCount(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
baseURL = 'http://example.com/'
-- layouts/home.html --
Home: {{ range where site.RegularPages "WordCount" "gt" 50 }}{{ .Title }}|{{ end }}
-- layouts/_shortcodes/lorem.html --
{{ "ipsum " | strings.Repeat (.Get 0 | int) }}

-- content/p1.md --
---
title: "p1"
---
{{< lorem 100 >}}
-- content/p2.md --
---
title: "p2"
---
{{< lorem 20 >}}
-- content/p3.md --
---
title: "p3"
---
{{< lorem 60 >}}
  `

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", `
Home: p1|p3|
`)
}

// Issue #11279
func TestWhereLikeOperator(t *testing.T) {
	t.Parallel()
	files := `
-- content/p1.md --
---
title: P1
foo: ab
---
-- content/p2.md --
---
title: P2
foo: abc
---
-- content/p3.md --
---
title: P3
foo: bc
---
-- layouts/home.html --
<ul>
  {{- range where site.RegularPages "Params.foo" "like" "^ab" -}}
    <li>{{ .Title }}</li>
  {{- end -}}
</ul>
  `
	b := hugolib.Test(t, files)
	b.AssertFileContent("public/index.html", "<ul><li>P1</li><li>P2</li></ul>")
}

func TestTermEntriesCollectionsIssue12254(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
capitalizeListTitles = false
disableKinds = ['rss','sitemap']
-- content/p1.md --
---
title: p1
categories: [cat-a]
tags: ['tag-b','tag-a','tag-c']
---
-- content/p2.md --
---
title: p2
categories: [cat-a]
tags: ['tag-b','tag-a']
---
-- content/p3.md --
---
title: p3
categories: [cat-a]
tags: ['tag-b']
---
-- layouts/term.html --
{{ $list1 := .Pages }}
{{ range $i, $e := site.Taxonomies.tags.ByCount }}
{{ $list2 := .Pages }}
{{ $i }}: List1: {{ len $list1 }}|
{{ $i }}: List2: {{ len $list2 }}|
{{ $i }}: Intersect: {{ intersect $.Pages .Pages | len }}|
{{ $i }}: Union: {{ union $.Pages .Pages | len }}|
{{ $i }}: SymDiff: {{ symdiff $.Pages .Pages | len }}|
{{ $i }}: Uniq: {{ append $.Pages .Pages | uniq | len }}|
{{ end }}


`
	b := hugolib.Test(t, files)

	b.AssertFileContent("public/categories/cat-a/index.html",
		"0: List1: 3|\n0: List2: 3|\n0: Intersect: 3|\n0: Union: 3|\n0: SymDiff: 0|\n0: Uniq: 3|\n\n\n1: List1: 3|",
		"1: List2: 2|\n1: Intersect: 2|\n1: Union: 3|\n1: SymDiff: 1|\n1: Uniq: 3|\n\n\n2: List1: 3|\n2: List2: 1|",
		"2: Intersect: 1|\n2: Union: 3|\n2: SymDiff: 2|\n2: Uniq: 3|",
	)
}

// Issue #13181
func TestUnionResourcesMatch(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ['rss','sitemap', 'taxonomy', 'term', 'page']
-- layouts/home.html --
{{ $a := resources.Match "*a*" }}
{{ $b := resources.Match "*b*" }}
{{ $union := $a | union $b }}
{{ range $i, $e := $union }}
{{ $i }}: {{ .Name }}
{{ end }}$
-- assets/a1.html --
<div>file1</div>
-- assets/a2.html --
<div>file2</div>
-- assets/a3_b1.html --
<div>file3</div>
-- assets/b2.html --
<div>file4</div>
`

	b := hugolib.Test(t, files)

	b.AssertFileContentExact("public/index.html", "0: /a3_b1.html\n\n1: /b2.html\n\n2: /a1.html\n\n3: /a2.html\n$")
}

// Issue 13621.
func TestWhereNotInEmptySlice(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
-- layouts/home.html --
{{- $pages := where site.RegularPages "Kind" "not in" (slice) -}}
Len: {{  $pages | len }}|
-- layouts/all.html --
All|{{ .Title }}|
-- content/p1.md --

`

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html", "Len: 1|")
}

func TestD(t *testing.T) {
	t.Parallel()
	files := `
-- hugo.toml --
-- layouts/home.html --
{{ $p := site.RegularPages }}
5 random pages: {{ range collections.D 42 5 ($p | len) }}{{ with (index $p .) }}{{ .RelPermalink }}|{{ end }}{{ end }}$
-- content/a.md --
-- content/b.md --
-- content/c.md --
-- content/d.md --
-- content/e.md --
-- content/f.md --
-- content/g.md --
-- content/h.md --
-- content/i.md --
-- content/j.md --
-- content/k.md --
-- content/l.md --
-- content/m.md --
-- content/n.md --
-- content/o.md --
-- content/p.md --

`
	b := hugolib.Test(t, files)

	b.AssertFileContentExact("public/index.html", "5 random pages: /b/|/g/|/j/|/k/|/l/|$")
}

func TestGroup(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ["rss", "sitemap", "taxonomy", "term"]
-- layouts/home.html --
{{ $cool := .Site.RegularPages | group "cool" }}
{{ $cool.Key }}: {{ len $cool.Pages }}
-- content/page1.md --
-- content/page2.md --
 `

	hugolib.Test(t, files).AssertFileContent("public/index.html", "cool: 2")
}

func TestSlice(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ["rss", "sitemap"]
baseURL = "http://example.com/"
-- layouts/home.html --
{{ $cool := .Site.RegularPages | group "cool" }}
{{ $cool.Key }}: {{ len $cool.Pages }}
-- content/page1.md --
---
title: "Page 1"
tags: ["blue", "green"]
tags_weight: 10
---
-- content/page2.md --
---
title: "Page 2"
tags: ["blue", "green"]
tags_weight: 20
---
-- layouts/home.html --
{{ $cool := first 1 .Site.RegularPages | group "cool" }}
{{ $blue := after 1 .Site.RegularPages | group "blue" }}
{{ $weightedPages := index (index .Site.Taxonomies "tags") "blue" }}

{{ $p1 := index .Site.RegularPages 0 }}{{ $p2 := index .Site.RegularPages 1 }}
{{ $wp1 := index $weightedPages 0 }}{{ $wp2 := index $weightedPages 1 }}

{{ $pages := slice $p1 $p2 }}
{{ $pageGroups := slice $cool $blue }}
{{ $weighted := slice $wp1 $wp2 }}

{{ printf "pages:%d:%T:%s|%s" (len $pages) $pages (index $pages 0).Path (index $pages 1).Path }}
{{ printf "pageGroups:%d:%T:%s|%s" (len $pageGroups) $pageGroups (index (index $pageGroups 0).Pages 0).Path (index (index $pageGroups 1).Pages 0).Path}}
{{ printf "weightedPages:%d:%T" (len $weighted) $weighted | safeHTML }}
 `

	hugolib.Test(t, files).AssertFileContent("public/index.html",
		"pages:2:page.Pages:/page1|/page2",
		"pageGroups:2:page.PagesGroup:/page1|/page2",
		`weightedPages:2:page.WeightedPages`)
}

func TestUnion(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ["rss", "sitemap"]
baseURL = "http://example.com/"
-- layouts/home.html --
{{ $cool := .Site.RegularPages | group "cool" }}
{{ $cool.Key }}: {{ len $cool.Pages }}
-- content/page1.md --
---
title: "Page 1"
tags: ["blue", "green"]
tags_weight: 10
---
-- content/page2.md --
---
title: "Page 2"
tags: ["blue", "green"]
tags_weight: 20
---
-- content/page3.md --
---
title: "Page 3"
tags: ["blue", "green"]
tags_weight: 30
---
-- layouts/home.html --
{{ $unionPages := first 2 .Site.RegularPages | union .Site.RegularPages  }}
{{ $unionWeightedPages := .Site.Taxonomies.tags.blue | union .Site.Taxonomies.tags.green }}
{{ printf "unionPages: %T %d" $unionPages (len $unionPages) }} 
{{ printf "unionWeightedPages: %T %d" $unionWeightedPages (len $unionWeightedPages) }}
 `

	hugolib.Test(t, files).AssertFileContent("public/index.html",
		"unionPages: page.Pages 3",
		"unionWeightedPages: page.WeightedPages 6",
	)
}

func TestCollectionsFuncs(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ["rss", "sitemap"]
baseURL = "http://example.com/"
-- layouts/home.html --
{{ $cool := .Site.RegularPages | group "cool" }}
{{ $cool.Key }}: {{ len $cool.Pages }}
-- content/page1.md --
---
title: "Page 1"
tags: ["blue", "green"]
tags_weight: 10
---
-- content/page2.md --
---
title: "Page 2"
tags: ["blue", "green"]
tags_weight: 20
---
-- content/page3.md --
---
title: "Page 3"
tags: ["blue", "green"]
tags_weight: 30
---
-- layouts/home.html --
{{ $uniqPages := first 2 .Site.RegularPages | append .Site.RegularPages | uniq  }}
{{ $inTrue := in .Site.RegularPages (index .Site.RegularPages 1)  }}
{{ $inFalse := in .Site.RegularPages (.Site.Home)  }}

{{ printf "uniqPages: %T %d" $uniqPages (len $uniqPages) }}
{{ printf "inTrue: %t" $inTrue }}
{{ printf "inFalse: %t" $inFalse  }}
-- layouts/single.html --
{{ $related := .Site.RegularPages.Related . }}
{{ $symdiff := $related | symdiff .Site.RegularPages }}
Related: {{ range $related }}{{ .RelPermalink }}|{{ end }}
Symdiff: {{ range $symdiff }}{{ .RelPermalink }}|{{ end }}
 `

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html",
		"uniqPages: page.Pages 3",
		"inTrue: true",
		"inFalse: false",
	)

	b.AssertFileContent("public/page1/index.html", `Related: /page2/|/page3/|`, `Symdiff: /page1/|`)
}

func TestAppend(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ["rss", "sitemap"]
baseURL = "http://example.com/"
-- layouts/home.html --
{{ $cool := .Site.RegularPages | group "cool" }}
{{ $cool.Key }}: {{ len $cool.Pages }}
-- content/page1.md --
---
title: "Page 1"
tags: ["blue", "green"]
tags_weight: 10
---
-- content/page2.md --
---
title: "Page 2"
tags: ["blue", "green"]
tags_weight: 20
---
-- layouts/home.html --
{{ $p1 := index .Site.RegularPages 0 }}{{ $p2 := index .Site.RegularPages 1 }}

{{ $pages := slice }}

{{ if true }}
	{{ $pages = $pages | append $p2 $p1 }}
{{ end }}
{{ $appendPages := .Site.Pages | append .Site.RegularPages }}
{{ $appendStrings := slice "a" "b" | append "c" "d" "e" }}
{{ $appendStringsSlice := slice "a" "b" "c" | append (slice "c" "d") }}

{{ printf "pages:%d:%T:%s|%s" (len $pages) $pages (index $pages 0).Path (index $pages 1).Path  }}
{{ printf "appendPages:%d:%T:%v/%v" (len $appendPages) $appendPages (index $appendPages 0).Kind (index $appendPages 8).Kind  }}
{{ printf "appendStrings:%T:%v"  $appendStrings $appendStrings  }}
{{ printf "appendStringsSlice:%T:%v"  $appendStringsSlice $appendStringsSlice }}

{{/* add some slightly related funcs to check what types we get */}}
{{ $u :=  $appendStrings | union $appendStringsSlice }}
{{ $i :=  $appendStrings | intersect $appendStringsSlice }}
{{ printf "union:%T:%v" $u $u  }}
{{ printf "intersect:%T:%v" $i $i }}
 `

	hugolib.Test(t, files).AssertFileContent("public/index.html",
		"pages:2:page.Pages:/page2|/page1",
		"appendPages:9:page.Pages:home/page",
		"appendStrings:[]string:[a b c d e]",
		"appendStringsSlice:[]string:[a b c c d]",
		"union:[]string:[a b c d e]",
		"intersect:[]string:[a b c d]",
	)
}

func BenchmarkWhereAndSortPages(b *testing.B) {
	pageTemplate := `
-- content/page%04d.md --
---
title: Page%04d
---
`

	var files strings.Builder
	files.WriteString(`
-- hugo.toml --
-- layouts/all.html --
All.
`)

	for i := range 500 {
		files.WriteString(fmt.Sprintf(pageTemplate, i, i))
	}

	bb := hugolib.Test(b, files.String(), hugolib.TestOptWithConfig(func(conf *hugolib.IntegrationTestConfig) {
		conf.BuildCfg = hugolib.BuildCfg{
			SkipRender: true,
		}
	}))

	s := bb.H.Sites[0]
	seq := s.RegularPages()
	ns := s.TemplateStore.GetTemplateFuncsNamespace("collections").(*collections.Namespace)

	b.ResetTimer()

	b.Run("Where", func(b *testing.B) {
		for b.Loop() {
			v, err := ns.Where(context.Background(), seq, "Title", "ge", "Page0480")
			if err != nil {
				b.Fatal(err)
			}
			res := v.(page.Pages)
			if len(res) != 20 {
				b.Fatalf("Where didn't return an expected result, got %d", len(res))
			}
		}
	})

	b.Run("Sort", func(b *testing.B) {
		for b.Loop() {
			v, err := ns.Sort(context.Background(), s.RegularPages(), "Title", "desc")
			if err != nil {
				b.Fatal(err)
			}
			res := v.(page.Pages)
			if len(res) != 500 {
				b.Fatalf("Sort didn't return an expected result, got %d", len(res))
			}
		}
	})
}
