feat: Implement student notes functionality for lessons, including API endpoints, database schema, and frontend UI.

services/lms-service/src/handlers_notes.rs

@@ -0,0 +1,53 @@
+use axum::{
+    Json,
+    extract::{Path, State},
+    http::StatusCode,
+};
+use common::auth::Claims;
+use common::models::{SaveNotePayload, StudentNote};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+pub async fn get_note(
+    claims: Claims,
+    Path(lesson_id): Path<Uuid>,
+    State(pool): State<PgPool>,
+) -> Result<Json<Option<StudentNote>>, (StatusCode, String)> {
+    let note = sqlx::query_as::<_, StudentNote>(
+        "SELECT * FROM student_notes WHERE user_id = $1 AND lesson_id = $2",
+    )
+    .bind(claims.sub)
+    .bind(lesson_id)
+    .fetch_optional(&pool)
+    .await
+    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+
+    Ok(Json(note))
+}
+
+pub async fn save_note(
+    claims: Claims,
+    Path(lesson_id): Path<Uuid>,
+    State(pool): State<PgPool>,
+    Json(payload): Json<SaveNotePayload>,
+) -> Result<Json<StudentNote>, (StatusCode, String)> {
+    let note = sqlx::query_as::<_, StudentNote>(
+        r#"
+        INSERT INTO student_notes (user_id, lesson_id, content)
+        VALUES ($1, $2, $3)
+        ON CONFLICT (user_id, lesson_id) 
+        DO UPDATE SET 
+            content = EXCLUDED.content,
+            updated_at = NOW()
+        RETURNING *
+        "#,
+    )
+    .bind(claims.sub)
+    .bind(lesson_id)
+    .bind(payload.content)
+    .fetch_one(&pool)
+    .await
+    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+
+    Ok(Json(note))
+}