From f7eb6cc95d6fa7c52b0a1e6117cc51c333ef6e03 Mon Sep 17 00:00:00 2001
From: Michal Vanko <mklakakilli@gmail.com>
Date: Sun, 24 Nov 2024 14:56:54 +0100
Subject: [PATCH] Logic for recommended articles

---
 src/pages/blog_post_page.rs | 67 ++++++++++++++++++++++++++++---------
 templates/blog_post.html    | 15 ++++++++-
 2 files changed, 65 insertions(+), 17 deletions(-)

diff --git a/src/pages/blog_post_page.rs b/src/pages/blog_post_page.rs
index c101e8c..f425008 100644
--- a/src/pages/blog_post_page.rs
+++ b/src/pages/blog_post_page.rs
@@ -3,7 +3,9 @@ use axum::extract::OriginalUri;
 use axum::{extract::Path, http::StatusCode};
 use chrono::{DateTime, Utc};
 
-use crate::blog_posts::blog_post_model::BLOG_POST_PATH;
+use crate::blog_posts::blog_post_model::{Segment, BLOG_POST_PATH};
+use crate::post_utils::post_listing::get_post_list;
+use crate::post_utils::post_parser::ParseResult;
 use crate::{
     blog_posts::blog_post_model::BlogPostMetadata, components::site_header::Link, filters,
     post_utils::post_parser::parse_post,
@@ -18,10 +20,11 @@ pub struct BlogPostTemplate {
     pub body: String,
     pub date: DateTime<Utc>,
     pub tags: Vec<String>,
-    pub segment: String,
+    pub segment: Segment,
     pub header_props: HeaderProps,
     pub slug: String,
     pub thumbnail: Option<String>,
+    pub recommended_posts: Vec<ParseResult<BlogPostMetadata>>,
 }
 
 pub async fn render_blog_post(
@@ -29,22 +32,27 @@ pub async fn render_blog_post(
     OriginalUri(original_uri): OriginalUri,
 ) -> Result<BlogPostTemplate, StatusCode> {
     let path = format!("{}/{}.md", BLOG_POST_PATH, post_id);
-    let parse_post = parse_post::<BlogPostMetadata>(&path);
-    let parsed = parse_post.await?;
+    let post = parse_post::<BlogPostMetadata>(&path).await?;
     let segment = if original_uri.to_string().starts_with("/blog") {
-        "blog"
+        Segment::Blog
     } else if original_uri.to_string().starts_with("/broadcasts") {
-        "broadcasts"
+        Segment::Broadcasts
     } else {
-        "blog"
+        Segment::Blog
     };
 
+    let mut recommended_posts = get_recommended_posts(&segment, &post.metadata.tags).await?;
+    recommended_posts.retain(|post| post.slug != post_id);
+    recommended_posts.sort_by_key(|post| post.slug.to_string());
+    recommended_posts.reverse();
+    let recommended_posts = recommended_posts.into_iter().take(2).collect::<Vec<_>>();
+
     let header_props = match segment {
-        "blog" => HeaderProps::with_back_link(Link {
+        Segment::Blog => HeaderProps::with_back_link(Link {
             href: "/blog".to_string(),
             label: "All posts".to_string(),
         }),
-        "broadcasts" => HeaderProps::with_back_link(Link {
+        Segment::Broadcasts => HeaderProps::with_back_link(Link {
             href: "/broadcasts".to_string(),
             label: "All broadcasts".to_string(),
         }),
@@ -52,13 +60,40 @@ pub async fn render_blog_post(
     };
 
     Ok(BlogPostTemplate {
-        title: parsed.metadata.title,
-        date: parsed.metadata.date,
-        tags: parsed.metadata.tags,
-        body: parsed.body,
-        slug: parsed.slug,
-        segment: segment.to_string(),
-        thumbnail: parsed.metadata.thumbnail,
+        title: post.metadata.title,
+        date: post.metadata.date,
+        tags: post.metadata.tags,
+        body: post.body,
+        slug: post.slug,
+        segment,
+        thumbnail: post.metadata.thumbnail,
         header_props,
+        recommended_posts,
     })
 }
+
+async fn get_recommended_posts(
+    segment: &Segment,
+    tags: &[String],
+) -> Result<Vec<ParseResult<BlogPostMetadata>>, StatusCode> {
+    let posts = get_post_list::<BlogPostMetadata>(BLOG_POST_PATH).await?;
+
+    let recommended_posts = posts
+        .into_iter()
+        .filter(|post| {
+            let is_same_segment = post
+                .metadata
+                .segments
+                .iter()
+                .any(|post_segment| post_segment == segment);
+            let has_same_tags = post
+                .metadata
+                .tags
+                .iter()
+                .any(|post_tag| tags.contains(post_tag));
+            is_same_segment && has_same_tags
+        })
+        .collect::<Vec<_>>();
+
+    Ok(recommended_posts)
+}
diff --git a/templates/blog_post.html b/templates/blog_post.html
index 72b55fd..6651f0c 100644
--- a/templates/blog_post.html
+++ b/templates/blog_post.html
@@ -33,7 +33,20 @@
 </article>
 
 <!-- TODO: Next recommendations for reading -->
-<!-- TODO: Bact to all posts -->
+<!-- TODO: Back to all posts -->
 
 {# footer #}
+<footer>
+    <hr class="border-slate-300 m-5 md:my-8">
+
+    <ul class="mx-5">
+      {% for post in recommended_posts %}
+      <li>
+        {% include "components/blog_post_preview.html" %}
+        <!-- TODO hidden block media -->
+        <hr class="border-slate-300 my-5 md:my-8 hidden lg:block">
+      </li>
+      {% endfor %}
+    </ul>
+</footer>
 {% endblock %}