added logging

src/util/logger.rs

@@ -0,0 +1,78 @@
+// src/util/logger.rs
+use chrono::Local;
+use once_cell::sync::Lazy;
+use tokio::sync::Mutex;
+use std::fs::{self, OpenOptions};
+use std::io::Write;
+use std::path::PathBuf;
+
+static LOGGER: Lazy<Mutex<Option<DebugLogger>>> = Lazy::new(|| Mutex::new(None));
+
+pub struct DebugLogger {
+    file: std::fs::File,
+    log_path: PathBuf,
+}
+
+impl DebugLogger {
+    fn new(log_dir: &std::path::Path) -> std::io::Result<Self> {
+
+        fs::create_dir_all(log_dir)?;
+        let filename = format!("backtest_{}.log", Local::now().format("%Y%m%d_%H%M%S"));
+        let log_path = log_dir.join(&filename);
+        let file = OpenOptions::new()
+            .create(true)
+            .append(true)
+            .open(&log_path)?;
+        Ok(Self { file, log_path })
+    }
+
+    async fn log(&mut self, msg: &str) {
+        let line = format!("[{}] {}\n", Local::now().format("%H:%M:%S"), msg);
+        let _ = self.file.write_all(line.as_bytes());
+        let _ = self.file.flush();
+        println!("{}", line.trim_end());
+    }
+}
+
+pub async fn init_debug_logger(log_dir: &std::path::Path) -> Result<(), String> {
+    let mut logger = LOGGER.lock().await;
+    match DebugLogger::new(log_dir) {
+        Ok(l) => {
+            let log_path = l.log_path.clone();
+            *logger = Some(l);
+            println!("✓ Logger initialized at: {:?}", log_path);
+            Ok(())
+        }
+        Err(e) => {
+            let err_msg = format!("Failed to initialize logger: {}", e);
+            eprintln!("{}", err_msg);
+            Err(err_msg)
+        }
+    }
+}
+
+pub async fn log_message(msg: &str) {
+    let mut logger = LOGGER.lock().await;
+    if let Some(l) = logger.as_mut() {
+        l.log(msg).await;
+    } else {
+        println!("[LOG] {}", msg);
+    }
+}
+
+pub async fn log_detailed(level: &str, msg: &str) {
+    let formatted = format!("[{}] {}", level, msg);
+    log_message(&formatted).await;
+}
+
+pub async fn log_info(msg: &str) {
+    log_detailed("INFO", msg).await;
+}
+
+pub async fn log_warn(msg: &str) {
+    log_detailed("WARN", msg).await;
+}
+
+pub async fn log_error(msg: &str) {
+    log_detailed("ERROR", msg).await;
+}