sunox 0.0.6

use std::path::{Path, PathBuf};
use std::time::{SystemTime, UNIX_EPOCH};

use base64::Engine;
use base64::engine::general_purpose::URL_SAFE_NO_PAD as BASE64URL;
use serde::{Deserialize, Serialize};

use crate::core::CliError;

use super::types::BrowserEnvironment;

#[derive(Serialize, Deserialize, Debug, Default, Clone)]
pub struct AuthState {
    pub jwt: Option<String>,
    pub cookie: Option<String>,
    pub session_id: Option<String>,
    pub device_id: Option<String>,
    pub browser_environment: Option<BrowserEnvironment>,
    /// The __client cookie from clerk domain - long-lived (~7 days)
    pub clerk_client_cookie: Option<String>,
}

impl AuthState {
    pub fn load() -> Result<Self, CliError> {
        let path = Self::path();
        if !path.exists() {
            return Err(CliError::AuthMissing);
        }
        let data = std::fs::read_to_string(&path)?;
        serde_json::from_str(&data).map_err(|e| CliError::Config(format!("corrupt auth file: {e}")))
    }

    pub fn save(&self) -> Result<(), CliError> {
        let path = Self::path();
        self.save_to_path(&path)
    }

    fn save_to_path(&self, path: &Path) -> Result<(), CliError> {
        if let Some(parent) = path.parent() {
            std::fs::create_dir_all(parent)?;
        }
        let data = serde_json::to_string_pretty(self)?;
        let tmp = path.with_extension(format!(
            "json.{}.{}.tmp",
            std::process::id(),
            uuid::Uuid::new_v4()
        ));

        #[cfg(unix)]
        {
            use std::io::Write;
            use std::os::unix::fs::OpenOptionsExt;
            let mut file = std::fs::OpenOptions::new()
                .create(true)
                .truncate(true)
                .write(true)
                .mode(0o600)
                .open(&tmp)?;
            file.write_all(data.as_bytes())?;
            file.sync_all()?;
        }

        #[cfg(not(unix))]
        {
            std::fs::write(&tmp, &data)?;
        }

        std::fs::rename(&tmp, path)?;
        Ok(())
    }

    pub fn delete() -> Result<(), CliError> {
        let path = Self::path();
        if path.exists() {
            std::fs::remove_file(path)?;
        }
        Ok(())
    }

    pub fn is_jwt_expired(&self) -> bool {
        let Some(jwt) = &self.jwt else { return true };
        let parts: Vec<&str> = jwt.split('.').collect();
        if parts.len() != 3 {
            return true;
        }
        let claims = parts[1];
        let Ok(decoded) = BASE64URL.decode(claims) else {
            return true;
        };
        let Ok(value) = serde_json::from_slice::<serde_json::Value>(&decoded) else {
            return true;
        };
        let Some(exp) = value.get("exp").and_then(|v| v.as_u64()) else {
            return true;
        };
        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap_or_default()
            .as_secs();
        // Suno issues 1-hour JWTs, but generation can reject older tokens
        // before `exp`; refresh any JWT with under 30 minutes left.
        now + 1800 >= exp
    }

    fn path() -> PathBuf {
        directories::ProjectDirs::from("com", "sunox", "sunox")
            .map(|dirs| dirs.config_dir().join("auth.json"))
            .unwrap_or_else(|| PathBuf::from("~/.config/sunox/auth.json"))
    }
}

#[cfg(test)]
mod tests {
    use std::sync::{Arc, Barrier};
    use std::thread;

    use super::AuthState;

    #[test]
    fn concurrent_saves_to_same_auth_path_do_not_share_temp_file() {
        let dir =
            std::env::temp_dir().join(format!("sunox-auth-state-test-{}", uuid::Uuid::new_v4()));
        std::fs::create_dir_all(&dir).expect("test dir");
        let path = dir.join("auth.json");
        let barrier = Arc::new(Barrier::new(8));

        let handles = (0..8)
            .map(|index| {
                let path = path.clone();
                let barrier = Arc::clone(&barrier);
                thread::spawn(move || {
                    let auth = AuthState {
                        jwt: Some(format!("jwt-{index}")),
                        clerk_client_cookie: Some(format!("client-{index}")),
                        ..Default::default()
                    };
                    barrier.wait();
                    auth.save_to_path(&path)
                })
            })
            .collect::<Vec<_>>();

        for handle in handles {
            handle.join().expect("save thread").expect("save result");
        }

        let saved = std::fs::read_to_string(&path).expect("saved auth file");
        serde_json::from_str::<AuthState>(&saved).expect("valid saved auth json");
        std::fs::remove_dir_all(&dir).expect("cleanup");
    }
}