//! Single-use AC context registry (R-22).
//! Filesystem-based: ~/.gsh/consumed/{context_id}

use std::path::PathBuf;

/// Tracks consumed AC context IDs on the filesystem.
pub struct ConsumedRegistry {
    dir: PathBuf,
}

impl ConsumedRegistry {
    pub fn new(dir: PathBuf) -> Self {
        Self { dir }
    }

    /// Default registry location: ~/.gsh/consumed/
    pub fn default_location() -> Self {
        let dir = dirs::home_dir()
            .map(|h| h.join(".gsh").join("consumed"))
            .unwrap_or_else(|| PathBuf::from("/tmp/.gsh/consumed"));
        Self { dir }
    }

    pub fn is_consumed(&self, context_id: &str) -> bool {
        self.dir.join(context_id).exists()
    }

    pub fn mark_consumed(&mut self, context_id: &str) {
        let _ = std::fs::create_dir_all(&self.dir);
        let _ = std::fs::write(self.dir.join(context_id), "");
    }
}

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

    #[test]
    fn test_consume_and_check() {
        let dir = tempfile::tempdir().unwrap();
        let mut reg = ConsumedRegistry::new(dir.path().to_path_buf());

        assert!(!reg.is_consumed("ac-123"));
        reg.mark_consumed("ac-123");
        assert!(reg.is_consumed("ac-123"));
        assert!(!reg.is_consumed("ac-456"));
    }
}