feat(telegram): add voice message auto-transcription

- Add download_voice_file method to download voice/audio from Telegram
- Add transcribe_voice_file method using faster-whisper
- Add parse_voice_message to detect voice/audio messages
- Modify listen() to process voice messages and include transcription
- Add file_url helper for Telegram file downloads
- Add tests for voice message parsing

src/channels/telegram.rs

@@ -3,6 +3,7 @@ use async_trait::async_trait;
 use reqwest::multipart::{Form, Part};
 use std::path::Path;
 use std::time::Duration;
+use tokio::process::Command;
 
 /// Telegram's maximum message length for text messages
 const TELEGRAM_MAX_MESSAGE_LENGTH: usize = 4096;
@@ -179,14 +180,19 @@ fn parse_attachment_markers(message: &str) -> (String, Vec<TelegramAttachment>)
 }
 
 /// Telegram channel — long-polls the Bot API for updates
-pub struct TelegramChannel { workspace_dir: std::path::PathBuf,
+pub struct TelegramChannel {
+    workspace_dir: std::path::PathBuf,
     bot_token: String,
     allowed_users: Vec<String>,
     client: reqwest::Client,
 }
 
 impl TelegramChannel {
-    pub fn new(bot_token: String, allowed_users: Vec<String>, workspace_dir: Option<std::path::PathBuf>) -> Self {
+    pub fn new(
+        bot_token: String,
+        allowed_users: Vec<String>,
+        workspace_dir: Option<std::path::PathBuf>,
+    ) -> Self {
         Self {
             bot_token,
             allowed_users,
@@ -196,7 +202,14 @@ impl TelegramChannel {
     }
 
     fn api_url(&self, method: &str) -> String {
-        format!("https://api.telegram.org/bot{}/{method}", self.bot_token)
+        format!("https://api.telegram.org/bot{}/{}", self.bot_token, method)
+    }
+
+    fn file_url(&self, file_path: &str) -> String {
+        format!(
+            "https://api.telegram.org/file/bot{}/{}",
+            self.bot_token, file_path
+        )
     }
 
     fn is_user_allowed(&self, username: &str) -> bool {
@@ -210,6 +223,131 @@ impl TelegramChannel {
         identities.into_iter().any(|id| self.is_user_allowed(id))
     }
 
+    /// Download a voice/audio file from Telegram and return the local path
+    async fn download_voice_file(&self, file_id: &str) -> anyhow::Result<std::path::PathBuf> {
+        // Get file path from Telegram
+        let get_file_url = self.api_url("getFile");
+        let body = serde_json::json!({
+            "file_id": file_id
+        });
+
+        let resp = self
+            .client
+            .post(&get_file_url)
+            .json(&body)
+            .send()
+            .await?;
+
+        if !resp.status().is_success() {
+            let err = resp.text().await?;
+            anyhow::bail!("Telegram getFile failed: {}", err);
+        }
+
+        let data: serde_json::Value = resp.json().await?;
+        let file_path = data
+            .get("result")
+            .and_then(|r| r.get("file_path"))
+            .and_then(|p| p.as_str())
+            .ok_or_else(|| anyhow::anyhow!("No file_path in Telegram response"))?;
+
+        // Download the file
+        let download_url = self.file_url(file_path);
+        let file_resp = self.client.get(&download_url).send().await?;
+
+        if !file_resp.status().is_success() {
+            anyhow::bail!("Failed to download voice file: {}", file_resp.status());
+        }
+
+        // Save to workspace with unique name
+        let file_name = format!("voice_{}.ogg", chrono::Utc::now().format("%Y%m%d_%H%M%S_%f"));
+        let local_path = self.workspace_dir.join(&file_name);
+        let bytes = file_resp.bytes().await?;
+        tokio::fs::write(&local_path, &bytes).await?;
+
+        tracing::info!("Downloaded voice file to: {:?}", local_path);
+        Ok(local_path)
+    }
+
+    /// Transcribe a voice file using faster-whisper
+    async fn transcribe_voice_file(&self, audio_path: &std::path::Path) -> anyhow::Result<String> {
+        let script = r#"
+import sys
+import json
+
+def transcribe(audio_path):
+    from faster_whisper import WhisperModel
+    
+    model = WhisperModel("base", device="cpu", compute_type="int8")
+    segments, info = model.transcribe(audio_path, beam_size=5)
+    
+    text_parts = []
+    for segment in segments:
+        text_parts.append(segment.text.strip())
+    
+    result = {
+        "language": info.language,
+        "duration": round(info.duration, 2),
+        "text": " ".join(text_parts)
+    }
+    
+    print(json.dumps(result))
+
+if __name__ == "__main__":
+    transcribe(sys.argv[1])
+"#;
+
+        let output = Command::new("python3")
+            .arg("-c")
+            .arg(script)
+            .arg(audio_path)
+            .output()
+            .await;
+
+        match output {
+            Ok(result) => {
+                if result.status.success() {
+                    let stdout = String::from_utf8_lossy(&result.stdout);
+                    match serde_json::from_str::<serde_json::Value>(&stdout) {
+                        Ok(json) => {
+                            let text = json
+                                .get("text")
+                                .and_then(|t| t.as_str())
+                                .unwrap_or("")
+                                .to_string();
+                            let language = json
+                                .get("language")
+                                .and_then(|l| l.as_str())
+                                .unwrap_or("unknown");
+                            let duration = json
+                                .get("duration")
+                                .and_then(|d| d.as_f64())
+                                .unwrap_or(0.0);
+
+                            tracing::info!(
+                                "Transcribed voice message: {:.1}s, language: {}",
+                                duration,
+                                language
+                            );
+                            Ok(text)
+                        }
+                        Err(_) => {
+                            // Fallback: return raw stdout
+                            Ok(stdout.trim().to_string())
+                        }
+                    }
+                } else {
+                    let stderr = String::from_utf8_lossy(&result.stderr);
+                    tracing::warn!("Voice transcription failed: {}", stderr);
+                    Err(anyhow::anyhow!("Transcription failed: {}", stderr.trim()))
+                }
+            }
+            Err(e) => {
+                tracing::warn!("Failed to run transcription: {}", e);
+                Err(anyhow::anyhow!("Failed to run transcription: {}", e))
+            }
+        }
+    }
+
     fn parse_update_message(&self, update: &serde_json::Value) -> Option<ChannelMessage> {
         let message = update.get("message")?;
 
@@ -241,8 +379,9 @@ impl TelegramChannel {
 
         if !self.is_any_user_allowed(identities.iter().copied()) {
             tracing::warn!(
-                "Telegram: ignoring message from unauthorized user: username={username}, user_id={}. \
+                "Telegram: ignoring message from unauthorized user: username={}, user_id={}. \
 Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --channels-only`.",
+                username,
                 user_id.as_deref().unwrap_or("unknown")
             );
             return None;
@@ -260,7 +399,7 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
             .unwrap_or(0);
 
         Some(ChannelMessage {
-            id: format!("telegram_{chat_id}_{message_id}"),
+            id: format!("telegram_{}_{}", chat_id, message_id),
             sender: sender_identity,
             reply_target: chat_id,
             content: text.to_string(),
@@ -272,17 +411,80 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
         })
     }
 
+    /// Parse voice/audio messages from Telegram update (returns file_id and metadata)
+    fn parse_voice_message(
+        &self,
+        update: &serde_json::Value,
+    ) -> Option<(String, String, String, i64)> {
+        let message = update.get("message")?;
+
+        // Check for voice message
+        let file_id = if let Some(voice) = message.get("voice") {
+            voice.get("file_id").and_then(|v| v.as_str())?
+        } else if let Some(audio) = message.get("audio") {
+            // Also support audio messages
+            audio.get("file_id").and_then(|v| v.as_str())?
+        } else {
+            return None;
+        };
+
+        let username = message
+            .get("from")
+            .and_then(|from| from.get("username"))
+            .and_then(serde_json::Value::as_str)
+            .unwrap_or("unknown")
+            .to_string();
+
+        let user_id = message
+            .get("from")
+            .and_then(|from| from.get("id"))
+            .and_then(serde_json::Value::as_i64)
+            .map(|id| id.to_string());
+
+        let sender_identity = if username == "unknown" {
+            user_id.clone().unwrap_or_else(|| "unknown".to_string())
+        } else {
+            username.clone()
+        };
+
+        let mut identities = vec![username.as_str()];
+        if let Some(id) = user_id.as_deref() {
+            identities.push(id);
+        }
+
+        if !self.is_any_user_allowed(identities.iter().copied()) {
+            tracing::warn!(
+                "Telegram: ignoring voice message from unauthorized user: {}",
+                sender_identity
+            );
+            return None;
+        }
+
+        let chat_id = message
+            .get("chat")
+            .and_then(|chat| chat.get("id"))
+            .and_then(serde_json::Value::as_i64)
+            .map(|id| id.to_string())?;
+
+        let message_id = message
+            .get("message_id")
+            .and_then(serde_json::Value::as_i64)
+            .unwrap_or(0);
+
+        Some((file_id.to_string(), sender_identity, chat_id, message_id))
+    }
+
     async fn send_text_chunks(&self, message: &str, chat_id: &str) -> anyhow::Result<()> {
         let chunks = split_message_for_telegram(message);
 
         for (index, chunk) in chunks.iter().enumerate() {
             let text = if chunks.len() > 1 {
                 if index == 0 {
-                    format!("{chunk}\n\n(continues...)")
+                    format!("{}\n\n(continues...)", chunk)
                 } else if index == chunks.len() - 1 {
-                    format!("(continued)\n\n{chunk}")
+                    format!("(continued)\n\n{}", chunk)
                 } else {
-                    format!("(continued)\n\n{chunk}\n\n(continues...)")
+                    format!("(continued)\n\n{}\n\n(continues...)", chunk)
                 }
             } else {
                 chunk.to_string()
@@ -372,10 +574,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram {method} by URL failed: {err}");
+            anyhow::bail!("Telegram {} by URL failed: {}", method, err);
         }
 
-        tracing::info!("Telegram {method} sent to {chat_id}: {url}");
+        tracing::info!("Telegram {} sent to {}: {}", method, chat_id, url);
         Ok(())
     }
 
@@ -408,7 +610,7 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         let path = Path::new(target);
         if !path.exists() {
-            anyhow::bail!("Telegram attachment path not found: {target}");
+            anyhow::bail!("Telegram attachment path not found: {}", target);
         }
 
         match attachment.kind {
@@ -452,10 +654,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendDocument failed: {err}");
+            anyhow::bail!("Telegram sendDocument failed: {}", err);
         }
 
-        tracing::info!("Telegram document sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram document sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -486,10 +688,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendDocument failed: {err}");
+            anyhow::bail!("Telegram sendDocument failed: {}", err);
         }
 
-        tracing::info!("Telegram document sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram document sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -525,10 +727,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendPhoto failed: {err}");
+            anyhow::bail!("Telegram sendPhoto failed: {}", err);
         }
 
-        tracing::info!("Telegram photo sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram photo sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -559,10 +761,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendPhoto failed: {err}");
+            anyhow::bail!("Telegram sendPhoto failed: {}", err);
         }
 
-        tracing::info!("Telegram photo sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram photo sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -598,10 +800,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendVideo failed: {err}");
+            anyhow::bail!("Telegram sendVideo failed: {}", err);
         }
 
-        tracing::info!("Telegram video sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram video sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -637,10 +839,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendAudio failed: {err}");
+            anyhow::bail!("Telegram sendAudio failed: {}", err);
         }
 
-        tracing::info!("Telegram audio sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram audio sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -676,10 +878,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendVoice failed: {err}");
+            anyhow::bail!("Telegram sendVoice failed: {}", err);
         }
 
-        tracing::info!("Telegram voice sent to {chat_id}: {file_name}");
+        tracing::info!("Telegram voice sent to {}: {}", chat_id, file_name);
         Ok(())
     }
 
@@ -708,10 +910,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendDocument by URL failed: {err}");
+            anyhow::bail!("Telegram sendDocument by URL failed: {}", err);
         }
 
-        tracing::info!("Telegram document (URL) sent to {chat_id}: {url}");
+        tracing::info!("Telegram document (URL) sent to {}: {}", chat_id, url);
         Ok(())
     }
 
@@ -740,10 +942,10 @@ Allowlist Telegram @username or numeric user ID, then run `zeroclaw onboard --ch
 
         if !resp.status().is_success() {
             let err = resp.text().await?;
-            anyhow::bail!("Telegram sendPhoto by URL failed: {err}");
+            anyhow::bail!("Telegram sendPhoto by URL failed: {}", err);
         }
 
-        tracing::info!("Telegram photo (URL) sent to {chat_id}: {url}");
+        tracing::info!("Telegram photo (URL) sent to {}: {}", chat_id, url);
         Ok(())
     }
 
@@ -827,7 +1029,7 @@ impl Channel for TelegramChannel {
             let resp = match self.client.post(&url).json(&body).send().await {
                 Ok(r) => r,
                 Err(e) => {
-                    tracing::warn!("Telegram poll error: {e}");
+                    tracing::warn!("Telegram poll error: {}", e);
                     tokio::time::sleep(std::time::Duration::from_secs(5)).await;
                     continue;
                 }
@@ -836,7 +1038,7 @@ impl Channel for TelegramChannel {
             let data: serde_json::Value = match resp.json().await {
                 Ok(d) => d,
                 Err(e) => {
-                    tracing::warn!("Telegram parse error: {e}");
+                    tracing::warn!("Telegram parse error: {}", e);
                     tokio::time::sleep(std::time::Duration::from_secs(5)).await;
                     continue;
                 }
@@ -849,24 +1051,81 @@ impl Channel for TelegramChannel {
                         offset = uid + 1;
                     }
 
-                    let Some(msg) = self.parse_update_message(update) else {
+                    // First, try to parse as text message
+                    if let Some(msg) = self.parse_update_message(update) {
+                        // Send "typing" indicator immediately when we receive a message
+                        let typing_body = serde_json::json!({
+                            "chat_id": &msg.reply_target,
+                            "action": "typing"
+                        });
+                        let _ = self
+                            .client
+                            .post(self.api_url("sendChatAction"))
+                            .json(&typing_body)
+                            .send()
+                            .await;
+
+                        if tx.send(msg).await.is_err() {
+                            return Ok(());
+                        }
                         continue;
-                    };
+                    }
 
-                    // Send "typing" indicator immediately when we receive a message
-                    let typing_body = serde_json::json!({
-                        "chat_id": &msg.reply_target,
-                        "action": "typing"
-                    });
-                    let _ = self
-                        .client
-                        .post(self.api_url("sendChatAction"))
-                        .json(&typing_body)
-                        .send()
-                        .await; // Ignore errors for typing indicator
+                    // Then, try to parse as voice/audio message
+                    if let Some((file_id, sender, chat_id, message_id)) =
+                        self.parse_voice_message(update)
+                    {
+                        // Send "typing" indicator
+                        let typing_body = serde_json::json!({
+                            "chat_id": &chat_id,
+                            "action": "typing"
+                        });
+                        let _ = self
+                            .client
+                            .post(self.api_url("sendChatAction"))
+                            .json(&typing_body)
+                            .send()
+                            .await;
 
-                    if tx.send(msg).await.is_err() {
-                        return Ok(());
+                        // Download and transcribe the voice file
+                        let transcription = match self.download_voice_file(&file_id).await {
+                            Ok(audio_path) => {
+                                let result = self.transcribe_voice_file(&audio_path).await;
+                                // Clean up the downloaded file
+                                let _ = tokio::fs::remove_file(&audio_path).await;
+                                result
+                            }
+                            Err(e) => {
+                                tracing::warn!("Failed to download voice file: {}", e);
+                                Err(e)
+                            }
+                        };
+
+                        let content = match transcription {
+                            Ok(text) if !text.is_empty() => {
+                                format!("[Voice message transcription]\n{}", text)
+                            }
+                            Ok(_) => "[Voice message - empty transcription]".to_string(),
+                            Err(e) => {
+                                format!("[Voice message - transcription failed: {}]", e)
+                            }
+                        };
+
+                        let msg = ChannelMessage {
+                            id: format!("telegram_{}_{}", chat_id, message_id),
+                            sender,
+                            reply_target: chat_id,
+                            content,
+                            channel: "telegram".to_string(),
+                            timestamp: std::time::SystemTime::now()
+                                .duration_since(std::time::UNIX_EPOCH)
+                                .unwrap_or_default()
+                                .as_secs(),
+                        };
+
+                        if tx.send(msg).await.is_err() {
+                            return Ok(());
+                        }
                     }
                 }
             }
@@ -884,7 +1143,7 @@ impl Channel for TelegramChannel {
         {
             Ok(Ok(resp)) => resp.status().is_success(),
             Ok(Err(e)) => {
-                tracing::debug!("Telegram health check failed: {e}");
+                tracing::debug!("Telegram health check failed: {}", e);
                 false
             }
             Err(_) => {
@@ -901,41 +1160,50 @@ mod tests {
 
     #[test]
     fn telegram_channel_name() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         assert_eq!(ch.name(), "telegram");
     }
 
     #[test]
     fn telegram_api_url() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("getMe"),
             "https://api.telegram.org/bot123:ABC/getMe"
         );
     }
 
+    #[test]
+    fn telegram_file_url() {
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
+        assert_eq!(
+            ch.file_url("voice/file.ogg"),
+            "https://api.telegram.org/file/bot123:ABC/voice/file.ogg"
+        );
+    }
+
     #[test]
     fn telegram_user_allowed_wildcard() {
-        let ch = TelegramChannel::new("t".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["*".into()], None);
         assert!(ch.is_user_allowed("anyone"));
     }
 
     #[test]
     fn telegram_user_allowed_specific() {
-        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "bob".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "bob".into()], None);
         assert!(ch.is_user_allowed("alice"));
         assert!(!ch.is_user_allowed("eve"));
     }
 
     #[test]
     fn telegram_user_denied_empty() {
-        let ch = TelegramChannel::new("t".into(), vec![]);
+        let ch = TelegramChannel::new("t".into(), vec![], None);
         assert!(!ch.is_user_allowed("anyone"));
     }
 
     #[test]
     fn telegram_user_exact_match_not_substring() {
-        let ch = TelegramChannel::new("t".into(), vec!["alice".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["alice".into()], None);
         assert!(!ch.is_user_allowed("alice_bot"));
         assert!(!ch.is_user_allowed("alic"));
         assert!(!ch.is_user_allowed("malice"));
@@ -943,13 +1211,13 @@ mod tests {
 
     #[test]
     fn telegram_user_empty_string_denied() {
-        let ch = TelegramChannel::new("t".into(), vec!["alice".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["alice".into()], None);
         assert!(!ch.is_user_allowed(""));
     }
 
     #[test]
     fn telegram_user_case_sensitive() {
-        let ch = TelegramChannel::new("t".into(), vec!["Alice".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["Alice".into()], None);
         assert!(ch.is_user_allowed("Alice"));
         assert!(!ch.is_user_allowed("alice"));
         assert!(!ch.is_user_allowed("ALICE"));
@@ -957,7 +1225,7 @@ mod tests {
 
     #[test]
     fn telegram_wildcard_with_specific_users() {
-        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "*".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "*".into()], None);
         assert!(ch.is_user_allowed("alice"));
         assert!(ch.is_user_allowed("bob"));
         assert!(ch.is_user_allowed("anyone"));
@@ -965,13 +1233,13 @@ mod tests {
 
     #[test]
     fn telegram_user_allowed_by_numeric_id_identity() {
-        let ch = TelegramChannel::new("t".into(), vec!["123456789".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["123456789".into()], None);
         assert!(ch.is_any_user_allowed(["unknown", "123456789"]));
     }
 
     #[test]
     fn telegram_user_denied_when_none_of_identities_match() {
-        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "987654321".into()]);
+        let ch = TelegramChannel::new("t".into(), vec!["alice".into(), "987654321".into()], None);
         assert!(!ch.is_any_user_allowed(["unknown", "123456789"]));
     }
 
@@ -1025,7 +1293,7 @@ mod tests {
 
     #[test]
     fn parse_update_message_uses_chat_id_as_reply_target() {
-        let ch = TelegramChannel::new("token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("token".into(), vec!["*".into()], None);
         let update = serde_json::json!({
             "update_id": 1,
             "message": {
@@ -1053,7 +1321,7 @@ mod tests {
 
     #[test]
     fn parse_update_message_allows_numeric_id_without_username() {
-        let ch = TelegramChannel::new("token".into(), vec!["555".into()]);
+        let ch = TelegramChannel::new("token".into(), vec!["555".into()], None);
         let update = serde_json::json!({
             "update_id": 2,
             "message": {
@@ -1076,11 +1344,63 @@ mod tests {
         assert_eq!(msg.reply_target, "12345");
     }
 
+    #[test]
+    fn parse_voice_message_extracts_file_id() {
+        let ch = TelegramChannel::new("token".into(), vec!["*".into()], None);
+        let update = serde_json::json!({
+            "update_id": 3,
+            "message": {
+                "message_id": 42,
+                "voice": {
+                    "file_id": "AwADBAADbXXXXXXXX",
+                    "duration": 5
+                },
+                "from": {
+                    "id": 555,
+                    "username": "alice"
+                },
+                "chat": {
+                    "id": 12345
+                }
+            }
+        });
+
+        let result = ch.parse_voice_message(&update);
+        assert!(result.is_some());
+        let (file_id, sender, chat_id, message_id) = result.unwrap();
+        assert_eq!(file_id, "AwADBAADbXXXXXXXX");
+        assert_eq!(sender, "alice");
+        assert_eq!(chat_id, "12345");
+        assert_eq!(message_id, 42);
+    }
+
+    #[test]
+    fn parse_voice_message_returns_none_for_text_message() {
+        let ch = TelegramChannel::new("token".into(), vec!["*".into()], None);
+        let update = serde_json::json!({
+            "update_id": 4,
+            "message": {
+                "message_id": 10,
+                "text": "hello",
+                "from": {
+                    "id": 555,
+                    "username": "alice"
+                },
+                "chat": {
+                    "id": 12345
+                }
+            }
+        });
+
+        let result = ch.parse_voice_message(&update);
+        assert!(result.is_none());
+    }
+
     // ── File sending API URL tests ──────────────────────────────────
 
     #[test]
     fn telegram_api_url_send_document() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("sendDocument"),
             "https://api.telegram.org/bot123:ABC/sendDocument"
@@ -1089,7 +1409,7 @@ mod tests {
 
     #[test]
     fn telegram_api_url_send_photo() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("sendPhoto"),
             "https://api.telegram.org/bot123:ABC/sendPhoto"
@@ -1098,7 +1418,7 @@ mod tests {
 
     #[test]
     fn telegram_api_url_send_video() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("sendVideo"),
             "https://api.telegram.org/bot123:ABC/sendVideo"
@@ -1107,7 +1427,7 @@ mod tests {
 
     #[test]
     fn telegram_api_url_send_audio() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("sendAudio"),
             "https://api.telegram.org/bot123:ABC/sendAudio"
@@ -1116,7 +1436,7 @@ mod tests {
 
     #[test]
     fn telegram_api_url_send_voice() {
-        let ch = TelegramChannel::new("123:ABC".into(), vec![]);
+        let ch = TelegramChannel::new("123:ABC".into(), vec![], None);
         assert_eq!(
             ch.api_url("sendVoice"),
             "https://api.telegram.org/bot123:ABC/sendVoice"
@@ -1128,7 +1448,7 @@ mod tests {
     #[tokio::test]
     async fn telegram_send_document_bytes_builds_correct_form() {
         // This test verifies the method doesn't panic and handles bytes correctly
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes = b"Hello, this is a test file content".to_vec();
 
         // The actual API call will fail (no real server), but we verify the method exists
@@ -1143,13 +1463,14 @@ mod tests {
         // Error should be network-related, not a code bug
         assert!(
             err.contains("error") || err.contains("failed") || err.contains("connect"),
-            "Expected network error, got: {err}"
+            "Expected network error, got: {}",
+            err
         );
     }
 
     #[tokio::test]
     async fn telegram_send_photo_bytes_builds_correct_form() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         // Minimal valid PNG header bytes
         let file_bytes = vec![0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
 
@@ -1162,7 +1483,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_by_url_builds_correct_json() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
 
         let result = ch
             .send_document_by_url("123456", "https://example.com/file.pdf", Some("PDF doc"))
@@ -1173,7 +1494,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_photo_by_url_builds_correct_json() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
 
         let result = ch
             .send_photo_by_url("123456", "https://example.com/image.jpg", None)
@@ -1186,7 +1507,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_nonexistent_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let path = Path::new("/nonexistent/path/to/file.txt");
 
         let result = ch.send_document("123456", path, None).await;
@@ -1196,13 +1517,14 @@ mod tests {
         // Should fail with file not found error
         assert!(
             err.contains("No such file") || err.contains("not found") || err.contains("os error"),
-            "Expected file not found error, got: {err}"
+            "Expected file not found error, got: {}",
+            err
         );
     }
 
     #[tokio::test]
     async fn telegram_send_photo_nonexistent_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let path = Path::new("/nonexistent/path/to/photo.jpg");
 
         let result = ch.send_photo("123456", path, None).await;
@@ -1212,7 +1534,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_video_nonexistent_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let path = Path::new("/nonexistent/path/to/video.mp4");
 
         let result = ch.send_video("123456", path, None).await;
@@ -1222,7 +1544,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_audio_nonexistent_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let path = Path::new("/nonexistent/path/to/audio.mp3");
 
         let result = ch.send_audio("123456", path, None).await;
@@ -1232,7 +1554,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_voice_nonexistent_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let path = Path::new("/nonexistent/path/to/voice.ogg");
 
         let result = ch.send_voice("123456", path, None).await;
@@ -1320,7 +1642,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_bytes_with_caption() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes = b"test content".to_vec();
 
         // With caption
@@ -1338,7 +1660,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_photo_bytes_with_caption() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes = vec![0x89, 0x50, 0x4E, 0x47];
 
         // With caption
@@ -1363,7 +1685,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_bytes_empty_file() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes: Vec<u8> = vec![];
 
         let result = ch
@@ -1376,7 +1698,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_bytes_empty_filename() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes = b"content".to_vec();
 
         let result = ch.send_document_bytes("123456", file_bytes, "", None).await;
@@ -1387,7 +1709,7 @@ mod tests {
 
     #[tokio::test]
     async fn telegram_send_document_bytes_empty_chat_id() {
-        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()]);
+        let ch = TelegramChannel::new("fake-token".into(), vec!["*".into()], None);
         let file_bytes = b"content".to_vec();
 
         let result = ch
@@ -1405,7 +1727,7 @@ mod tests {
         // Verify that message IDs follow the format: telegram_{chat_id}_{message_id}
         let chat_id = "123456";
         let message_id = 789;
-        let expected_id = format!("telegram_{chat_id}_{message_id}");
+        let expected_id = format!("telegram_{}_{}", chat_id, message_id);
         assert_eq!(expected_id, "telegram_123456_789");
     }
 
@@ -1414,8 +1736,8 @@ mod tests {
         // Same chat_id + same message_id = same ID (prevents duplicates after restart)
         let chat_id = "123456";
         let message_id = 789;
-        let id1 = format!("telegram_{chat_id}_{message_id}");
-        let id2 = format!("telegram_{chat_id}_{message_id}");
+        let id1 = format!("telegram_{}_{}", chat_id, message_id);
+        let id2 = format!("telegram_{}_{}", chat_id, message_id);
         assert_eq!(id1, id2);
     }
 
@@ -1423,8 +1745,8 @@ mod tests {
     fn telegram_message_id_different_message_different_id() {
         // Different message IDs produce different IDs
         let chat_id = "123456";
-        let id1 = format!("telegram_{chat_id}_789");
-        let id2 = format!("telegram_{chat_id}_790");
+        let id1 = format!("telegram_{}_789", chat_id);
+        let id2 = format!("telegram_{}_790", chat_id);
         assert_ne!(id1, id2);
     }
 
@@ -1432,8 +1754,8 @@ mod tests {
     fn telegram_message_id_different_chat_different_id() {
         // Different chats produce different IDs even with same message_id
         let message_id = 789;
-        let id1 = format!("telegram_123456_{message_id}");
-        let id2 = format!("telegram_789012_{message_id}");
+        let id1 = format!("telegram_123456_{}", message_id);
+        let id2 = format!("telegram_789012_{}", message_id);
         assert_ne!(id1, id2);
     }
 
@@ -1442,7 +1764,7 @@ mod tests {
         // Verify format doesn't contain random UUID components
         let chat_id = "123456";
         let message_id = 789;
-        let id = format!("telegram_{chat_id}_{message_id}");
+        let id = format!("telegram_{}_{}", chat_id, message_id);
         assert!(!id.contains('-')); // No UUID dashes
         assert!(id.starts_with("telegram_"));
     }
@@ -1452,7 +1774,7 @@ mod tests {
         // Edge case: message_id can be 0 (fallback/missing case)
         let chat_id = "123456";
         let message_id = 0;
-        let id = format!("telegram_{chat_id}_{message_id}");
+        let id = format!("telegram_{}_{}", chat_id, message_id);
         assert_eq!(id, "telegram_123456_0");
     }
 }