Mpp cdk cli (#743)

* refactor: Extract user input logic into a helper function

* feat: get multiple quotes (hacky)

* refactor: cdk-cli

* refactor: cdk-cli

* feat: refactor balances

crates/cdk-cli/src/utils.rs

@@ -0,0 +1,83 @@
+use std::io::{self, Write};
+use std::str::FromStr;
+
+use anyhow::{bail, Result};
+use cdk::mint_url::MintUrl;
+use cdk::nuts::CurrencyUnit;
+use cdk::wallet::multi_mint_wallet::MultiMintWallet;
+use cdk::wallet::types::WalletKey;
+use cdk::Amount;
+
+/// Helper function to get user input with a prompt
+pub fn get_user_input(prompt: &str) -> Result<String> {
+    println!("{}", prompt);
+    let mut user_input = String::new();
+    io::stdout().flush()?;
+    io::stdin().read_line(&mut user_input)?;
+    Ok(user_input.trim().to_string())
+}
+
+/// Helper function to get a number from user input with a prompt
+pub fn get_number_input<T>(prompt: &str) -> Result<T>
+where
+    T: FromStr,
+    T::Err: std::error::Error + Send + Sync + 'static,
+{
+    let input = get_user_input(prompt)?;
+    let number = input.parse::<T>()?;
+    Ok(number)
+}
+
+/// Helper function to validate a mint number against available mints
+pub fn validate_mint_number(mint_number: usize, mint_count: usize) -> Result<()> {
+    if mint_number >= mint_count {
+        bail!("Invalid mint number");
+    }
+    Ok(())
+}
+
+/// Helper function to check if there are enough funds for an operation
+pub fn check_sufficient_funds(available: Amount, required: Amount) -> Result<()> {
+    if required.gt(&available) {
+        bail!("Not enough funds");
+    }
+    Ok(())
+}
+
+/// Helper function to get a wallet from the multi-mint wallet
+pub async fn get_wallet_by_index(
+    multi_mint_wallet: &MultiMintWallet,
+    mint_amounts: &[(MintUrl, Amount)],
+    mint_number: usize,
+    unit: CurrencyUnit,
+) -> Result<cdk::wallet::Wallet> {
+    validate_mint_number(mint_number, mint_amounts.len())?;
+
+    let wallet_key = WalletKey::new(mint_amounts[mint_number].0.clone(), unit);
+    let wallet = multi_mint_wallet
+        .get_wallet(&wallet_key)
+        .await
+        .ok_or_else(|| anyhow::anyhow!("Wallet not found"))?;
+
+    Ok(wallet.clone())
+}
+
+/// Helper function to create or get a wallet
+pub async fn get_or_create_wallet(
+    multi_mint_wallet: &MultiMintWallet,
+    mint_url: &MintUrl,
+    unit: CurrencyUnit,
+) -> Result<cdk::wallet::Wallet> {
+    match multi_mint_wallet
+        .get_wallet(&WalletKey::new(mint_url.clone(), unit.clone()))
+        .await
+    {
+        Some(wallet) => Ok(wallet.clone()),
+        None => {
+            tracing::debug!("Wallet does not exist creating..");
+            multi_mint_wallet
+                .create_and_add_wallet(&mint_url.to_string(), unit, None)
+                .await
+        }
+    }
+}