// Copyright 2016 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 hugolib

import (
	"fmt"
	"path/filepath"
	"strings"
	"testing"

	"github.com/gohugoio/hugo/identity"

	qt "github.com/frankban/quicktest"
	"github.com/gohugoio/hugo/deps"
	"github.com/gohugoio/hugo/hugofs"
	"github.com/gohugoio/hugo/tpl"

	"github.com/spf13/viper"
)

func TestTemplateLookupOrder(t *testing.T) {
	var (
		fs  *hugofs.Fs
		cfg *viper.Viper
		th  testHelper
	)

	// Variants base templates:
	//   1. <current-path>/<template-name>-baseof.<suffix>, e.g. list-baseof.<suffix>.
	//   2. <current-path>/baseof.<suffix>
	//   3. _default/<template-name>-baseof.<suffix>, e.g. list-baseof.<suffix>.
	//   4. _default/baseof.<suffix>
	for _, this := range []struct {
		name   string
		setup  func(t *testing.T)
		assert func(t *testing.T)
	}{
		{
			"Variant 1",
			func(t *testing.T) {
				writeSource(t, fs, filepath.Join("layouts", "section", "sect1-baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "section", "sect1.html"), `{{define "main"}}sect{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base: sect")
			},
		},
		{
			"Variant 2",
			func(t *testing.T) {
				writeSource(t, fs, filepath.Join("layouts", "baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "index.html"), `{{define "main"}}index{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "index.html"), "Base: index")
			},
		},
		{
			"Variant 3",
			func(t *testing.T) {
				writeSource(t, fs, filepath.Join("layouts", "_default", "list-baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "_default", "list.html"), `{{define "main"}}list{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base: list")
			},
		},
		{
			"Variant 4",
			func(t *testing.T) {
				writeSource(t, fs, filepath.Join("layouts", "_default", "baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "_default", "list.html"), `{{define "main"}}list{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base: list")
			},
		},
		{
			"Variant 1, theme, use site base",
			func(t *testing.T) {
				cfg.Set("theme", "mytheme")
				writeSource(t, fs, filepath.Join("layouts", "section", "sect1-baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "section", "sect-baseof.html"), `Base Theme: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "section", "sect1.html"), `{{define "main"}}sect{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base: sect")
			},
		},
		{
			"Variant 1, theme, use theme base",
			func(t *testing.T) {
				cfg.Set("theme", "mytheme")
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "section", "sect1-baseof.html"), `Base Theme: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "section", "sect1.html"), `{{define "main"}}sect{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base Theme: sect")
			},
		},
		{
			"Variant 4, theme, use site base",
			func(t *testing.T) {
				cfg.Set("theme", "mytheme")
				writeSource(t, fs, filepath.Join("layouts", "_default", "baseof.html"), `Base: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "baseof.html"), `Base Theme: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "list.html"), `{{define "main"}}list{{ end }}`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "index.html"), `{{define "main"}}index{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base: list")
				th.assertFileContent(filepath.Join("public", "index.html"), "Base: index") // Issue #3505
			},
		},
		{
			"Variant 4, theme, use themes base",
			func(t *testing.T) {
				cfg.Set("theme", "mytheme")
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "baseof.html"), `Base Theme: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "list.html"), `{{define "main"}}list{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base Theme: list")
			},
		},
		{
			// Issue #3116
			"Test section list and single template selection",
			func(t *testing.T) {
				cfg.Set("theme", "mytheme")

				writeSource(t, fs, filepath.Join("layouts", "_default", "baseof.html"), `Base: {{block "main" .}}block{{end}}`)

				// Both single and list template in /SECTION/
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "sect1", "list.html"), `sect list`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "list.html"), `default list`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "sect1", "single.html"), `sect single`)
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "_default", "single.html"), `default single`)

				// sect2 with list template in /section
				writeSource(t, fs, filepath.Join("themes", "mytheme", "layouts", "section", "sect2.html"), `sect2 list`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "sect list")
				th.assertFileContent(filepath.Join("public", "sect1", "page1", "index.html"), "sect single")
				th.assertFileContent(filepath.Join("public", "sect2", "index.html"), "sect2 list")
			},
		},
		{
			// Issue #2995
			"Test section list and single template selection with base template",
			func(t *testing.T) {

				writeSource(t, fs, filepath.Join("layouts", "_default", "baseof.html"), `Base Default: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "sect1", "baseof.html"), `Base Sect1: {{block "main" .}}block{{end}}`)
				writeSource(t, fs, filepath.Join("layouts", "section", "sect2-baseof.html"), `Base Sect2: {{block "main" .}}block{{end}}`)

				// Both single and list + base template in /SECTION/
				writeSource(t, fs, filepath.Join("layouts", "sect1", "list.html"), `{{define "main"}}sect1 list{{ end }}`)
				writeSource(t, fs, filepath.Join("layouts", "_default", "list.html"), `{{define "main"}}default list{{ end }}`)
				writeSource(t, fs, filepath.Join("layouts", "sect1", "single.html"), `{{define "main"}}sect single{{ end }}`)
				writeSource(t, fs, filepath.Join("layouts", "_default", "single.html"), `{{define "main"}}default single{{ end }}`)

				// sect2 with list template in /section
				writeSource(t, fs, filepath.Join("layouts", "section", "sect2.html"), `{{define "main"}}sect2 list{{ end }}`)

			},
			func(t *testing.T) {
				th.assertFileContent(filepath.Join("public", "sect1", "index.html"), "Base Sect1", "sect1 list")
				th.assertFileContent(filepath.Join("public", "sect1", "page1", "index.html"), "Base Sect1", "sect single")
				th.assertFileContent(filepath.Join("public", "sect2", "index.html"), "Base Sect2", "sect2 list")

				// Note that this will get the default base template and not the one in /sect2 -- because there are no
				// single template defined in /sect2.
				th.assertFileContent(filepath.Join("public", "sect2", "page2", "index.html"), "Base Default", "default single")
			},
		},
	} {

		this := this
		t.Run(this.name, func(t *testing.T) {
			// TODO(bep) there are some function vars need to pull down here to enable => t.Parallel()
			cfg, fs = newTestCfg()
			th = newTestHelper(cfg, fs, t)

			for i := 1; i <= 3; i++ {
				writeSource(t, fs, filepath.Join("content", fmt.Sprintf("sect%d", i), fmt.Sprintf("page%d.md", i)), `---
title: Template test
---
Some content
`)
			}

			this.setup(t)

			buildSingleSite(t, deps.DepsCfg{Fs: fs, Cfg: cfg}, BuildCfg{})
			//helpers.PrintFs(s.BaseFs.Layouts.Fs, "", os.Stdout)
			this.assert(t)
		})

	}
}

// https://github.com/gohugoio/hugo/issues/4895
func TestTemplateBOM(t *testing.T) {

	b := newTestSitesBuilder(t).WithSimpleConfigFile()
	bom := "\ufeff"

	b.WithTemplatesAdded(
		"_default/baseof.html", bom+`
		Base: {{ block "main" . }}base main{{ end }}`,
		"_default/single.html", bom+`{{ define "main" }}Hi!?{{ end }}`)

	b.WithContent("page.md", `---
title: "Page"
---

Page Content
`)

	b.CreateSites().Build(BuildCfg{})

	b.AssertFileContent("public/page/index.html", "Base: Hi!?")

}

func TestTemplateLateTemplates(t *testing.T) {
	t.Parallel()
	b := newTestSitesBuilder(t).WithSimpleConfigFile().Running()

	numPages := 500 // To get some parallelism
	homeTempl := `
Len RegularPages: {{ len site.RegularPages }}
{{ range site.RegularPages }}
Link: {{ .RelPermalink }} Len Content: {{ len .Content }}
{{ end }}
`
	pageTemplate := `<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>{{ .RelPermalink }}</title>
  <meta name="description" content="The HTML5 Herald">
  <meta name="author" content="SitePoint">
  <link rel="stylesheet" href="css/styles.css?v=1.0">
</head>
<body>
  <h1>{{ .RelPermalink }}</h1>
  <p>Shortcode: {{< shortcode >}}</p>
  <p>Partial: {{ partial "mypartial.html" . }}</p>
  <script src="js/scripts.js"></script>
</body>
</html>
`

	b.WithTemplatesAdded(
		"index.html", homeTempl,
		"partials/mypartial.html", `this my partial`,
	)

	// Make sure we get some parallelism.
	for i := 0; i < numPages; i++ {
		b.WithContent(fmt.Sprintf("page%d.html", i+1), pageTemplate)
	}

	b.Build(BuildCfg{})

	b.AssertFileContent("public/index.html", fmt.Sprintf(`
Len RegularPages: %d
Link: /page3/ Len Content: 0
Link: /page22/ Len Content: 0
`, numPages))

	for i := 0; i < numPages; i++ {
		b.AssertFileContent(fmt.Sprintf("public/page%d/index.html", i+1),
			fmt.Sprintf(`<title>/page%d/</title>`, i+1),
			`<p>Shortcode: Shortcode: Hello</p>`,
			"<p>Partial: this my partial</p>",
		)
	}

	b.EditFiles(
		"layouts/partials/mypartial.html", `this my changed partial`,
		"layouts/index.html", (homeTempl + "CHANGED"),
	)
	for i := 0; i < 5; i++ {
		b.EditFiles(fmt.Sprintf("content/page%d.html", i+1), pageTemplate+"CHANGED")
	}

	b.Build(BuildCfg{})
	b.AssertFileContent("public/index.html", fmt.Sprintf(`
Len RegularPages: %d
Link: /page3/ Len Content: 0
Link: /page2/ Len Content: 0
CHANGED
`, numPages))
	for i := 0; i < 5; i++ {
		b.AssertFileContent(fmt.Sprintf("public/page%d/index.html", i+1),
			fmt.Sprintf(`<title>/page%d/</title>`, i+1),
			`<p>Shortcode: Shortcode: Hello</p>`,
			"<p>Partial: this my changed partial</p>",
			"CHANGED",
		)
	}

}

func TestTemplateManyBaseTemplates(t *testing.T) {
	t.Parallel()
	b := newTestSitesBuilder(t).WithSimpleConfigFile()

	numPages := 100 // To get some parallelism

	pageTemplate := `---
title: "Page %d"
layout: "layout%d"
---

Content.
`

	singleTemplate := `
{{ define "main" }}%d{{ end }}
`
	baseTemplate := `
Base %d: {{ block "main" . }}FOO{{ end }}
`

	for i := 0; i < numPages; i++ {
		id := i + 1
		b.WithContent(fmt.Sprintf("page%d.md", id), fmt.Sprintf(pageTemplate, id, id))
		b.WithTemplates(fmt.Sprintf("_default/layout%d.html", id), fmt.Sprintf(singleTemplate, id))
		b.WithTemplates(fmt.Sprintf("_default/layout%d-baseof.html", id), fmt.Sprintf(baseTemplate, id))
	}

	b.Build(BuildCfg{})
	for i := 0; i < numPages; i++ {
		id := i + 1
		b.AssertFileContent(fmt.Sprintf("public/page%d/index.html", id), fmt.Sprintf(`Base %d: %d`, id, id))
	}

}

// https://github.com/gohugoio/hugo/issues/6790
func TestTemplateNoBasePlease(t *testing.T) {
	t.Parallel()
	b := newTestSitesBuilder(t).WithSimpleConfigFile()

	b.WithTemplates("_default/list.html", `
	{{ define "main" }}
	  Bonjour
	{{ end }}

	{{ printf "list" }}


	`)

	b.WithTemplates(
		"_default/single.html", `
{{ printf "single" }}
{{ define "main" }}
  Bonjour
{{ end }}


`)

	b.WithContent("blog/p1.md", `---
title: The Page
---
`)

	b.Build(BuildCfg{})

	b.AssertFileContent("public/blog/p1/index.html", `single`)
	b.AssertFileContent("public/blog/index.html", `list`)

}

// https://github.com/gohugoio/hugo/issues/6816
func TestTemplateBaseWithComment(t *testing.T) {
	t.Parallel()
	b := newTestSitesBuilder(t).WithSimpleConfigFile()
	b.WithTemplatesAdded(
		"baseof.html", `Base: {{ block "main" . }}{{ end }}`,
		"index.html", `
	{{/*  A comment */}}
	{{ define "main" }}
	  Bonjour
	{{ end }}


	`)

	b.Build(BuildCfg{})
	b.AssertFileContent("public/index.html", `Base:
Bonjour`)

}

func TestTemplateLookupSite(t *testing.T) {
	t.Run("basic", func(t *testing.T) {
		t.Parallel()
		b := newTestSitesBuilder(t).WithSimpleConfigFile()
		b.WithTemplates(
			"_default/single.html", `Single: {{ .Title }}`,
			"_default/list.html", `List: {{ .Title }}`,
		)

		createContent := func(title string) string {
			return fmt.Sprintf(`---
title: %s
---`, title)
		}

		b.WithContent(
			"_index.md", createContent("Home Sweet Home"),
			"p1.md", createContent("P1"))

		b.CreateSites().Build(BuildCfg{})
		b.AssertFileContent("public/index.html", `List: Home Sweet Home`)
		b.AssertFileContent("public/p1/index.html", `Single: P1`)
	})

	t.Run("baseof", func(t *testing.T) {
		t.Parallel()
		b := newTestSitesBuilder(t).WithDefaultMultiSiteConfig()

		b.WithTemplatesAdded(
			"index.html", `{{ define "main" }}Main Home En{{ end }}`,
			"index.fr.html", `{{ define "main" }}Main Home Fr{{ end }}`,
			"baseof.html", `Baseof en: {{ block "main" . }}main block{{ end }}`,
			"baseof.fr.html", `Baseof fr: {{ block "main" . }}main block{{ end }}`,
			"mysection/baseof.html", `Baseof mysection: {{ block "main" .  }}mysection block{{ end }}`,
			"_default/single.html", `{{ define "main" }}Main Default Single{{ end }}`,
			"_default/list.html", `{{ define "main" }}Main Default List{{ end }}`,
		)

		b.WithContent("mysection/p1.md", `---
title: My Page
---

`)

		b.CreateSites().Build(BuildCfg{})

		b.AssertFileContent("public/en/index.html", `Baseof en: Main Home En`)
		b.AssertFileContent("public/fr/index.html", `Baseof fr: Main Home Fr`)
		b.AssertFileContent("public/en/mysection/index.html", `Baseof mysection: Main Default List`)
		b.AssertFileContent("public/en/mysection/p1/index.html", `Baseof mysection: Main Default Single`)

	})

}

func TestTemplateFuncs(t *testing.T) {

	b := newTestSitesBuilder(t).WithDefaultMultiSiteConfig()

	homeTpl := `Site: {{ site.Language.Lang }} / {{ .Site.Language.Lang }} / {{ site.BaseURL }}
Sites: {{ site.Sites.First.Home.Language.Lang }}
Hugo: {{ hugo.Generator }}
`

	b.WithTemplatesAdded(
		"index.html", homeTpl,
		"index.fr.html", homeTpl,
	)

	b.CreateSites().Build(BuildCfg{})

	b.AssertFileContent("public/en/index.html",
		"Site: en / en / http://example.com/blog",
		"Sites: en",
		"Hugo: <meta name=\"generator\" content=\"Hugo")
	b.AssertFileContent("public/fr/index.html",
		"Site: fr / fr / http://example.com/blog",
		"Sites: en",
		"Hugo: <meta name=\"generator\" content=\"Hugo",
	)

}

func TestPartialWithReturn(t *testing.T) {

	b := newTestSitesBuilder(t).WithSimpleConfigFile()

	b.WithTemplatesAdded(
		"index.html", `
Test Partials With Return Values:

add42: 50: {{ partial "add42.tpl" 8 }}
dollarContext: 60: {{ partial "dollarContext.tpl" 18 }}
adder: 70: {{ partial "dict.tpl" (dict "adder" 28) }}
complex: 80: {{ partial "complex.tpl" 38 }}
`,
		"partials/add42.tpl", `
		{{ $v := add . 42 }}
		{{ return $v }}
		`,
		"partials/dollarContext.tpl", `
{{ $v := add $ 42 }}
{{ return $v }}
`,
		"partials/dict.tpl", `
{{ $v := add $.adder 42 }}
{{ return $v }}
`,
		"partials/complex.tpl", `
{{ return add . 42 }}
`,
	)

	b.CreateSites().Build(BuildCfg{})

	b.AssertFileContent("public/index.html",
		"add42: 50: 50",
		"dollarContext: 60: 60",
		"adder: 70: 70",
		"complex: 80: 80",
	)

}

func TestPartialCached(t *testing.T) {
	b := newTestSitesBuilder(t)

	b.WithTemplatesAdded(
		"index.html", `
{{ $key1 := (dict "a" "av" ) }}
{{ $key2 := (dict "a" "av2" ) }}
Partial cached1: {{ partialCached "p1" "input1" $key1 }}
Partial cached2: {{ partialCached "p1" "input2" $key1 }}
Partial cached3: {{ partialCached "p1" "input3" $key2 }}
`,

		"partials/p1.html", `partial: {{ . }}`,
	)

	b.Build(BuildCfg{})

	b.AssertFileContent("public/index.html", `
 Partial cached1: partial: input1
 Partial cached2: partial: input1
 Partial cached3: partial: input3
`)
}

// https://github.com/gohugoio/hugo/issues/6615
func TestTemplateTruth(t *testing.T) {
	b := newTestSitesBuilder(t)
	b.WithTemplatesAdded("index.html", `
{{ $p := index site.RegularPages 0 }}
{{ $zero := $p.ExpiryDate }}
{{ $notZero := time.Now }}

if: Zero: {{ if $zero }}FAIL{{ else }}OK{{ end }}
if: Not Zero: {{ if $notZero }}OK{{ else }}Fail{{ end }}
not: Zero: {{ if not $zero }}OK{{ else }}FAIL{{ end }}
not: Not Zero: {{ if not $notZero }}FAIL{{ else }}OK{{ end }}

with: Zero {{ with $zero }}FAIL{{ else }}OK{{ end }}

`)

	b.Build(BuildCfg{})

	b.AssertFileContent("public/index.html", `
if: Zero: OK
if: Not Zero: OK
not: Zero: OK
not: Not Zero: OK
with: Zero OK
`)
}

func TestTemplateDependencies(t *testing.T) {
	b := newTestSitesBuilder(t).Running()

	b.WithTemplates("index.html", `
{{ $p := site.GetPage "p1" }}
{{ partial "p1.html"  $p }}
{{ partialCached "p2.html" "foo" }}
{{ partials.Include "p3.html" "data" }}
{{ partials.IncludeCached "p4.html" "foo" }}
{{ $p := partial "p5" }}
{{ partial "sub/p6.html" }}
{{ partial "P7.html" }}
{{ template "_default/foo.html" }}
Partial nested: {{ partial "p10" }}

`,
		"partials/p1.html", `ps: {{ .Render "li" }}`,
		"partials/p2.html", `p2`,
		"partials/p3.html", `p3`,
		"partials/p4.html", `p4`,
		"partials/p5.html", `p5`,
		"partials/sub/p6.html", `p6`,
		"partials/P7.html", `p7`,
		"partials/p8.html", `p8 {{ partial "p9.html" }}`,
		"partials/p9.html", `p9`,
		"partials/p10.html", `p10 {{ partial "p11.html" }}`,
		"partials/p11.html", `p11`,
		"_default/foo.html", `foo`,
		"_default/li.html", `li {{ partial "p8.html" }}`,
	)

	b.WithContent("p1.md", `---
title: P1
---


`)

	b.Build(BuildCfg{})

	s := b.H.Sites[0]

	templ, found := s.lookupTemplate("index.html")
	b.Assert(found, qt.Equals, true)

	idset := make(map[identity.Identity]bool)
	collectIdentities(idset, templ.(tpl.Info))
	b.Assert(idset, qt.HasLen, 10)

}

func collectIdentities(set map[identity.Identity]bool, provider identity.Provider) {
	if ids, ok := provider.(identity.IdentitiesProvider); ok {
		for _, id := range ids.GetIdentities() {
			collectIdentities(set, id)
		}
	} else {
		set[provider.GetIdentity()] = true
	}
}

func ident(level int) string {
	return strings.Repeat(" ", level)
}