From 4f09648a34a9bb91ba487ff5f345278ce2e66f46 Mon Sep 17 00:00:00 2001
From: Lumither Tao <lumither@outlook.com>
Date: Sat, 4 May 2024 21:06:01 +0800
Subject: [PATCH] feat(backend/api/get/post/<post_id>) implement api

---
 backend/post.sql                |  6 ++-
 backend/src/api/get/get_post.rs | 67 ++++++++++++++++++++++++++++++---
 backend/tag.sql                 |  6 ++-
 3 files changed, 72 insertions(+), 7 deletions(-)

diff --git a/backend/post.sql b/backend/post.sql
index 120e885..b27b701 100644
--- a/backend/post.sql
+++ b/backend/post.sql
@@ -17,4 +17,8 @@ ON CONFLICT (post_id)
                   summary      = excluded.summary,
                   content      = excluded.content,
                   last_update  = excluded.last_update,
-                  first_update = excluded.first_update
+                  first_update = excluded.first_update;
+
+SELECT *
+FROM Post
+WHERE post_id = $1;
diff --git a/backend/src/api/get/get_post.rs b/backend/src/api/get/get_post.rs
index c3b4526..4ea0991 100644
--- a/backend/src/api/get/get_post.rs
+++ b/backend/src/api/get/get_post.rs
@@ -1,12 +1,69 @@
+use std::str::FromStr;
+
 use axum::extract::{Path, State};
 use axum::Json;
-use serde_json::Value;
-use sqlx::PgPool;
+use chrono::NaiveDateTime;
+use serde_json::{json, Map, Value};
+use sqlx::{PgPool, query, Row};
+use uuid::Uuid;
 
 pub async fn get_post(
-    State(_db_connection): State<PgPool>,
+    State(db_connection): State<PgPool>,
     Path(post_id): Path<String>,
 ) -> Result<Json<Value>, Json<Value>> {
-    dbg!(&post_id);
-    todo!()
+    let meta = query(
+        r#"
+SELECT *
+FROM Post
+WHERE post_id = $1;
+    "#,
+    )
+        .bind(Uuid::from_str(post_id.as_str()).expect("Failed to parse UUID"))
+        .fetch_one(&db_connection)
+        .await
+        .expect("Failed to execute db query");
+
+    let tags = query(
+        r#"
+SELECT tag FROM Tag WHERE post_id = $1;
+    "#,
+    )
+        .bind(Uuid::from_str(post_id.as_str()).expect("Failed to parse UUID"))
+        .fetch_all(&db_connection)
+        .await
+        .expect("Failed to execute db query");
+
+    let mut res = Map::new();
+
+    res.insert(
+        "title".to_string(),
+        json!(meta.get::<String, &str>("title")),
+    );
+    res.insert(
+        "summary".to_string(),
+        json!(meta.get::<String, &str>("summary")),
+    );
+    res.insert(
+        "content".to_string(),
+        json!(meta.get::<String, &str>("content")),
+    );
+    res.insert(
+        "last_update".to_string(),
+        json!(meta.get::<NaiveDateTime, &str>("last_update")),
+    );
+    res.insert(
+        "first_update".to_string(),
+        json!(meta.get::<NaiveDateTime, &str>("first_update")),
+    );
+
+    let tags: Vec<String> = tags
+        .iter()
+        .map(|tag| {
+            let tag: String = tag.get("tag");
+            tag
+        })
+        .collect();
+    res.insert("tags".to_string(), Value::from(tags));
+
+    Ok(Json::from(Value::from(res)))
 }
diff --git a/backend/tag.sql b/backend/tag.sql
index be061aa..80699c4 100644
--- a/backend/tag.sql
+++ b/backend/tag.sql
@@ -5,4 +5,8 @@ CREATE TABLE IF NOT EXISTS Tag
 );
 
 INSERT INTO Tag
-VALUES ($1, $2);
\ No newline at end of file
+VALUES ($1, $2);
+
+SELECT *
+FROM Tag
+WHERE post_id = $1;