Merge pull request #24 from coding-kelps/16-add-default_language-re-prompt-if-not-found-for-a-given-problem

16 add default language re prompt if not found for a given problem

Author: dfayd0

src/leetcode_api_runner.rs

@@ -23,12 +23,22 @@ pub struct LeetcodeApiRunner {
 }
 
 impl LeetcodeApiRunner {
-    pub async fn new(rcs: &RuntimeConfigSetup) -> Self {
-        let api = UserApi::new(&rcs.config.leetcode_token).await.unwrap();
-        LeetcodeApiRunner {
+    pub async fn new(rcs: &RuntimeConfigSetup) -> Result<Self, io::Error> {
+        Ok(LeetcodeApiRunner {
             rcs: rcs.clone(),
-            api,
-        }
+            api: UserApi::new(&rcs.config.leetcode_token).await.map_err(
+                |_| {
+                    io::Error::new(
+                        io::ErrorKind::NotConnected,
+                        format!(
+                            "An error occurred while creating the API client. \
+                             Check your token in your configuration file: {}",
+                            rcs.config_file.display()
+                        ),
+                    )
+                },
+            )?,
+        })
     }
 
     pub async fn get_problem_info(&self, id: u32) -> io::Result<String> {
@@ -46,6 +56,26 @@ impl LeetcodeApiRunner {
         Ok(format!("{} {}: {}\n{}", id, difficulty, title, description))
     }
 
+    /// Fetches the problem name by its ID.
+    pub async fn get_problem_name(&self, id: u32) -> io::Result<String> {
+        let pb = self.api.set_problem_by_id(id).await.unwrap();
+        Ok(pb.description().unwrap().name.clone())
+    }
+
+    /// Fetches the available languages for a given problem ID.
+    pub async fn get_available_languages(
+        &self, id: &u32,
+    ) -> io::Result<Vec<String>> {
+        let problem = self.api.set_problem_by_id(*id).await?;
+
+        Ok(problem
+            .code_snippets()
+            .expect("No code snippets found.")
+            .iter()
+            .map(|snippet| snippet.langSlug.clone())
+            .collect::<Vec<_>>())
+    }
+
     pub async fn start_problem(
         &self, id: u32, language: ProgrammingLanguage,
     ) -> io::Result<String> {

src/main.rs

@@ -2,6 +2,7 @@ use clap::Parser;
 use leetcode_cli::{
     utils::{
         parse_programming_language,
+        prompt_for_language,
         spin_the_spinner,
     },
     Cli,
@@ -15,7 +16,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let cli = Cli::parse();
     let mut rcs = RuntimeConfigSetup::new();
     rcs.status()?;
-    let api_runner = LeetcodeApiRunner::new(&rcs).await;
+    let api_runner = LeetcodeApiRunner::new(&rcs).await?;
 
     match &cli.command {
         Commands::Info {
@@ -33,11 +34,29 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             id,
             language,
         } => {
-            let default = &rcs.config.default_language.unwrap();
-            let lang = match language {
-                Some(lang) => parse_programming_language(lang)?,
-                None => parse_programming_language(default)?,
+            let default_lang = rcs
+                .config
+                .default_language
+                .clone()
+                .unwrap_or_else(|| "not found".to_string());
+            let mut lang = match language {
+                Some(lang) => parse_programming_language(lang),
+                None => parse_programming_language(&default_lang),
             };
+            let mut spin = spin_the_spinner("Gathering problem info...");
+            let problem_name = api_runner.get_problem_name(*id).await?;
+            let available_languages =
+                api_runner.get_available_languages(&id).await?;
+            spin.stop();
+            while lang.is_err() {
+                lang = prompt_for_language(
+                    id,
+                    &problem_name,
+                    &available_languages,
+                )
+                .and_then(|lang| parse_programming_language(&lang));
+            }
+            let lang = lang.unwrap();
             let mut spin = spin_the_spinner("Starting problem setup...");
             let start_problem = api_runner.start_problem(*id, lang).await;
             spin.stop();

src/utils.rs

@@ -34,7 +34,7 @@ pub fn write_to_file(
 
 pub fn parse_programming_language(
     lang: &str,
-) -> Result<leetcoderustapi::ProgrammingLanguage, String> {
+) -> Result<leetcoderustapi::ProgrammingLanguage, std::io::Error> {
     match lang.to_ascii_lowercase().as_str() {
         "cpp" | "c++" => Ok(leetcoderustapi::ProgrammingLanguage::CPP),
         "java" => Ok(leetcoderustapi::ProgrammingLanguage::Java),
@@ -62,7 +62,10 @@ pub fn parse_programming_language(
         "dart" => Ok(leetcoderustapi::ProgrammingLanguage::Dart),
         "pandas" => Ok(leetcoderustapi::ProgrammingLanguage::Pandas),
         "react" => Ok(leetcoderustapi::ProgrammingLanguage::React),
-        _ => Err(format!("Unsupported language: {}", lang)),
+        _ => Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            format!("Unsupported language: {}", lang),
+        )),
     }
 }
 
@@ -159,3 +162,27 @@ pub fn extension_programming_language(
 pub fn spin_the_spinner(message: &str) -> spinners::Spinner {
     spinners::Spinner::new(spinners::Spinners::Dots12, message.to_string())
 }
+
+pub fn prompt_for_language(
+    id: &u32, problem_name: &str, available_languages: &[String],
+) -> Result<String, io::Error> {
+    println!(
+        "\nPlease enter a valid Leetcode programming language.\nHere is a \
+         list of available languages for the problem {} - {}\n{}",
+        id,
+        problem_name,
+        available_languages
+            .iter()
+            .map(|l| l.to_string())
+            .collect::<Vec<_>>()
+            .join(", ")
+    );
+    let mut input = String::new();
+    io::stdin().read_line(&mut input)?;
+    let trimmed = input.trim().to_string();
+    if trimmed.is_empty() {
+        Err(io::Error::new(io::ErrorKind::InvalidInput, "No language entered"))
+    } else {
+        Ok(trimmed)
+    }
+}