Add user input database verification

src/userinterface.rs

@@ -12,19 +12,35 @@ use tui_textarea::{Input, Key, TextArea};
 
 use anyhow::Result;
 
-fn validate_user(textarea: &mut TextArea) -> bool {
-    if let Err(_) = textarea.lines()[0].parse::<u64>() {
-        textarea.set_style(Style::default().fg(Color::LightRed));
-        textarea.set_block(
-            Block::default()
-                .borders(Borders::ALL)
-                .title(format!("ERROR: Please enter a valid user number")),
-        );
-        false
-    } else {
-        textarea.set_style(Style::default().fg(Color::LightGreen));
-        textarea.set_block(Block::default().borders(Borders::ALL).title("OK"));
-        true
+use crate::database::Database;
+
+async fn validate_user(textarea: &mut TextArea<'_>, db: &Database) -> bool {
+    match textarea.lines()[0].parse::<u64>() {
+        Err(_) => {
+            textarea.set_style(Style::default().fg(Color::LightRed));
+            textarea.set_block(
+                Block::default()
+                    .borders(Borders::ALL)
+                    .title(format!("ERROR: Please enter a valid user number")),
+            );
+            false
+        }
+        Ok(value) => {
+            let db_user = db.user_exists(value as i64).await.is_ok();
+            if db_user {
+                textarea.set_style(Style::default().fg(Color::LightGreen));
+                textarea.set_block(Block::default().borders(Borders::ALL).title("OK"));
+                true
+            } else {
+                textarea.set_style(Style::default().fg(Color::LightRed));
+                textarea.set_block(
+                    Block::default()
+                        .borders(Borders::ALL)
+                        .title(format!("ERROR: Please enter a valid user number")),
+                );
+                false
+            }
+        }
     }
 }
 
@@ -56,7 +72,7 @@ fn validate_rating(textarea: &mut TextArea) -> bool {
     }
 }
 
-pub fn get_user_rating() -> Result<(String, String)> {
+pub async fn get_user_rating(db: &Database) -> Result<(String, String)> {
     let stdout = io::stdout();
     let mut stdout = stdout.lock();
 
@@ -70,7 +86,7 @@ pub fn get_user_rating() -> Result<(String, String)> {
     textarea.set_placeholder_text("USER: Enter a valid user number (e.g. 156)");
     let layout =
         Layout::default().constraints([Constraint::Length(3), Constraint::Min(1)].as_slice());
-    let mut is_valid = validate_user(&mut textarea);
+    let mut is_valid = validate_user(&mut textarea, db).await;
 
     loop {
         term.draw(|f| {
@@ -95,7 +111,7 @@ pub fn get_user_rating() -> Result<(String, String)> {
             input => {
                 // TextArea::input returns if the input modified its text
                 if textarea.input(input) {
-                    is_valid = validate_user(&mut textarea);
+                    is_valid = validate_user(&mut textarea, db).await;
                 }
             }
         }