/// Task ID generation utilities
use uuid::Uuid;

/// Generate a clean task ID with only alphanumeric characters
/// Format: "task" + 32-character hexadecimal string (from UUID v7)
///
/// # Examples
///
/// ```
/// use voice_cli::utils::task_id::generate_task_id;
///
/// let task_id = generate_task_id();
/// assert!(task_id.starts_with("task"));
/// assert!(!task_id.contains('-'));
/// assert!(!task_id.contains('_'));
/// assert_eq!(task_id.len(), 36); // "task" + 32 hex chars
/// ```
pub fn generate_task_id() -> String {
    let uuid = Uuid::now_v7().to_string();
    // 移除所有连字符和下划线，只保留字母和数字
    let cleaned_uuid = uuid.replace(['-', '_'], "");
    format!("task{}", cleaned_uuid)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_generate_task_id_format() {
        let task_id = generate_task_id();

        // Check format
        assert!(task_id.starts_with("task"));
        assert!(!task_id.contains('-'));
        assert!(!task_id.contains('_'));

        // Check length (task + 32 hex chars)
        assert_eq!(task_id.len(), 36);

        // Check that it's all alphanumeric after "task" prefix
        let suffix = &task_id[4..];
        assert!(suffix.chars().all(|c| c.is_ascii_hexdigit()));
    }

    #[test]
    fn test_generate_task_id_uniqueness() {
        let id1 = generate_task_id();
        let id2 = generate_task_id();

        // Should be different (due to timestamp in UUID v7)
        assert_ne!(id1, id2);
    }
}