From 34c9cf2a0072a6688aeaae6eab63d37c25657d45 Mon Sep 17 00:00:00 2001
From: jyhein <124268211+jyhein@users.noreply.github.com>
Date: Mon, 27 Nov 2023 12:23:02 +0200
Subject: [PATCH] pkp/pkp-lib#7272 Simultaneously Displaying Multilingual
 Metadata on the Article Landing Page

---
 pages/catalog/CatalogBookHandler.php          | 41 ++++++++++
 plugins/themes/default/DefaultThemePlugin.php | 20 +++++
 plugins/themes/default/locale/en/locale.po    |  9 +++
 .../styles/objects/monograph_full.less        |  5 +-
 templates/frontend/objects/monograph_full.tpl | 74 +++++++++++++------
 5 files changed, 124 insertions(+), 25 deletions(-)

diff --git a/pages/catalog/CatalogBookHandler.php b/pages/catalog/CatalogBookHandler.php
index 1e67c74858b..add76a40178 100755
--- a/pages/catalog/CatalogBookHandler.php
+++ b/pages/catalog/CatalogBookHandler.php
@@ -300,6 +300,13 @@ public function book($args, $request)
             $templateMgr->addHeader('canonical', '<link rel="canonical" href="' . $url . '">');
         }
 
+        $templateMgr->assign('pubLocaleData', $this->getPublicationLocaleData(
+            $this->publication,
+            $request->getContext()->getPrimaryLocale(),
+            $templateMgr->getTemplateVars('activeTheme')->getOption('showMultilingualMetadata') ?: [],
+            $templateMgr->getTemplateVars('activeTheme')->getOption('showMetadata') ?: []
+        ));
+
         // Display
         if (!Hook::call('CatalogBookHandler::book', [&$request, &$submission, &$this->publication, &$this->chapter])) {
             $templateMgr->display('frontend/pages/book.tpl');
@@ -611,4 +618,38 @@ protected function getChaptersFirstPublishedDate(Submission $submission, Chapter
 
         return null;
     }
+
+    /**
+     * Format multilingual publication data for template:
+     * Default data at least includes in one language: full title, title, subtitle, keywords, abstract
+     * showMultilingualMetadataOpts adds multilingual metadata: title (by default includes fullTitle and subtitle), keywords, abstract, etc.
+     * showMetadataOpts: additional metadata
+     */
+    protected function getPublicationLocaleData(Publication $publication, string $contextPrimaryLocale, array $showMultilingualMetadataOpts, array $showMetadataOpts): array
+    {
+        $titles = collect([
+            'title' => $publication->getTitles('html'),
+            'subtitle' => $publication->getSubtitles('html'),
+            'fullTitle' => $publication->getFullTitles('html'),
+        ]);
+        $metadataOpts = collect(['keywords', 'abstract'])->concat($showMetadataOpts)->diff($titles->keys())->unique()->values();
+        $multilingualOpts = collect($showMultilingualMetadataOpts)
+            ->when(in_array('title', $showMultilingualMetadataOpts), fn ($m) => $m->concat(['subtitle', 'fullTitle'])->unique()->values());
+        $primaryLocale = isset($titles->get('title')[$contextPrimaryLocale]) ? $contextPrimaryLocale : $publication->getData('locale');
+
+        $getText = fn (array $item, string $opt): array => [
+            $opt => [
+                'text' => ($text = array_filter($item, fn (string $locale) => $multilingualOpts->contains($opt) || $locale === $primaryLocale, ARRAY_FILTER_USE_KEY)),
+                'headingLang' => collect($text)->map(fn ($_, string $locale): string => $locale === $primaryLocale ? $contextPrimaryLocale : $locale)->toArray()
+            ],
+        ];
+
+        $pubLocaleData = $titles->mapWithKeys($getText)
+            ->union($metadataOpts->mapWithKeys(fn (string $opt): array => $getText($publication->getData($opt) ?? [], $opt)));
+        return $pubLocaleData
+            ->put('languages', $pubLocaleData->map(fn (array $item): array => array_keys($item['text']))
+                ->flatten()->sort()->prepend($primaryLocale)->unique()->values())
+            ->put('primaryLocale', $primaryLocale)
+            ->toArray();
+    }
 }
diff --git a/plugins/themes/default/DefaultThemePlugin.php b/plugins/themes/default/DefaultThemePlugin.php
index 49a9c148ac4..4029f48bdb5 100644
--- a/plugins/themes/default/DefaultThemePlugin.php
+++ b/plugins/themes/default/DefaultThemePlugin.php
@@ -126,6 +126,26 @@ public function init()
             'default' => 'none',
         ]);
 
+        $this->addOption('showMultilingualMetadata', 'FieldOptions', [
+            'label' => __('plugins.themes.default.option.metadata.label'),
+            'description' => __('plugins.themes.default.option.metadata.description'),
+            'options' => [
+                [
+                    'value' => 'title',
+                    'label' => __('submission.title'),
+                ],
+                [
+                    'value' => 'keywords',
+                    'label' => __('common.keywords'),
+                ],
+                [
+                    'value' => 'abstract',
+                    'label' => __('submission.synopsis'),
+                ],
+            ],
+            'default' => [],
+        ]);
+
         // Load primary stylesheet
         $this->addStyle('stylesheet', 'styles/index.less');
 
diff --git a/plugins/themes/default/locale/en/locale.po b/plugins/themes/default/locale/en/locale.po
index 92ba3303c69..6247431c25a 100644
--- a/plugins/themes/default/locale/en/locale.po
+++ b/plugins/themes/default/locale/en/locale.po
@@ -101,3 +101,12 @@ msgstr "Next slide"
 
 msgid "plugins.themes.default.prevSlide"
 msgstr "Previous slide"
+
+msgid "plugins.themes.default.option.metadata.label"
+msgstr "Show book metadata on the book landing page"
+
+msgid "plugins.themes.default.option.metadata.description"
+msgstr "Select the book metadata to show in other languages."
+
+msgid "plugins.themes.default.submissionMetadataInLanguage"
+msgstr "Book Metadata in English"
diff --git a/plugins/themes/default/styles/objects/monograph_full.less b/plugins/themes/default/styles/objects/monograph_full.less
index 057bc84e016..2ba0411bc3c 100644
--- a/plugins/themes/default/styles/objects/monograph_full.less
+++ b/plugins/themes/default/styles/objects/monograph_full.less
@@ -24,8 +24,9 @@
 
 	.main_entry {
 
-		.item {
-			padding: 30px 0;
+		.item,
+		.metadata {
+			padding: @double 0;
 
 			&:first-child {
 				padding-top: 0;
diff --git a/templates/frontend/objects/monograph_full.tpl b/templates/frontend/objects/monograph_full.tpl
index 0999f472097..e0605307aee 100644
--- a/templates/frontend/objects/monograph_full.tpl
+++ b/templates/frontend/objects/monograph_full.tpl
@@ -71,6 +71,7 @@
  * @uses $licenseUrl string The URL which provides license information.
  * @uses $ccLicenseBadge string An HTML string containing a CC license image and
  *       text. Only appears when license URL matches a known CC license.
+ * @uses $pubLocaleData array Array of formatted publication locale metadata: titles, abstracts, keywords,
  *}
 <div class="obj_monograph_full">
 
@@ -93,8 +94,8 @@
 		</div>
 	{/if}
 
-	<h1 class="title">
-		{$publication->getLocalizedFullTitle(null, 'html')|strip_unsafe_html}
+	<h1 class="title" lang="{$pubLocaleData.primaryLocale|replace:"_":"-"}">
+		{$pubLocaleData.fullTitle.text[$pubLocaleData.primaryLocale]|strip_unsafe_html}
 	</h1>
 
 	<div class="row">
@@ -119,30 +120,57 @@
 				</div>
 			{/if}
 
-			{* Keywords *}
-			{if !empty($publication->getLocalizedData('keywords'))}
-				<div class="item keywords">
-					<h2 class="label">
-						{capture assign=translatedKeywords}{translate key="common.keywords"}{/capture}
-						{translate key="semicolon" label=$translatedKeywords}
+			{*
+			 * Show article keywords and abstract in ui, or submission, language by default.
+			 * Show optional multilingual metadata: titles, keywords, abstracts.
+			 *}
+			{foreach from=$pubLocaleData.languages item=lang}
+				<div class="metadata">
+				{assign "hLvl" "2"}
+				{* Multilingual metadata title *}
+				{if $lang !== $pubLocaleData.primaryLocale}
+					{assign "hLvl" "3"}
+					<h2 class="label page_metadata_title" lang={$lang|replace:"_":"-"}>
+						{translate key="plugins.themes.default.submissionMetadataInLanguage" locale=$lang}
 					</h2>
-					<span class="value">
-					{foreach name="keywords" from=$publication->getLocalizedData('keywords') item=keyword}
-						{$keyword|escape}{if !$smarty.foreach.keywords.last}, {/if}
-					{/foreach}
-				</span>
-				</div>
-			{/if}
+					{* Titles in other language *}
+					{if isset($pubLocaleData.fullTitle.text[$lang])}
+						<div class="item page_locale_title">
+							<h{$hLvl} class="label" lang="{$pubLocaleData.fullTitle.headingLang[$lang]|replace:"_":"-"}">
+								{translate key="submission.title" locale=$pubLocaleData.fullTitle.headingLang[$lang]}
+							</h{$hLvl}>
+							<p lang="{$lang|replace:"_":"-"}">
+								{$pubLocaleData.fullTitle.text[$lang]|strip_tags}
+							</p>
+						</div>
+					{/if}
+				{/if}
 
-			{* Abstract *}
-			<div class="item abstract">
-				<h2 class="label">
-					{translate key="submission.synopsis"}
-				</h2>
-				<div class="value">
-					{$publication->getLocalizedData('abstract')|strip_unsafe_html}
+				{* Keywords *}
+				{if isset($pubLocaleData.keywords.text[$lang])}
+					<div class="item keywords">
+						<h{$hLvl} class="label" lang="{$pubLocaleData.keywords.headingLang[$lang]|replace:"_":"-"}">
+							{translate key="common.keywords" locale=$pubLocaleData.keywords.headingLang[$lang]}
+						</h{$hLvl}>
+						<p class="value" lang="{$lang|replace:"_":"-"}">
+						{foreach from=$pubLocaleData.keywords.text[$lang] item="keyword"}
+							{$keyword|escape}{if !$keyword@last}{translate key="common.commaListSeparator" locale=$pubLocaleData.keywords.headingLang[$lang]}{/if}
+						{/foreach}
+						</p>
+					</div>
+				{/if}
+
+				{* Abstract *}
+				{if isset($pubLocaleData.abstract.text[$lang])}
+					<div class="item abstract">
+						<h{$hLvl} class="label" lang="{$pubLocaleData.abstract.headingLang[$lang]|replace:"_":"-"}">
+							{translate key="submission.synopsis" locale=$pubLocaleData.abstract.headingLang[$lang]}
+						</h{$hLvl}>
+						<p lang="{$lang|replace:"_":"-"}">{$pubLocaleData.abstract.text[$lang]|strip_tags}</p>
+					</div>
+				{/if}
 				</div>
-			</div>
+			{/foreach}
 
 			{* Chapters *}
 			{if $chapters|@count}