//! DataLoader utilities for extracting references from records

use serde_json::Value;

/// Extract URI from a strongRef value
/// strongRef format: { "$type": "com.atproto.repo.strongRef", "uri": "at://...", "cid": "..." }
pub fn extract_uri_from_strong_ref(value: &Value) -> Option<String> {
    if let Some(obj) = value.as_object() {
        // Check if this is a strongRef
        if let Some(type_val) = obj.get("$type") {
            if type_val.as_str() == Some("com.atproto.repo.strongRef") {
                return obj
                    .get("uri")
                    .and_then(|u| u.as_str())
                    .map(|s| s.to_string());
            }
        }

        // Also support direct uri field (some lexicons might use this)
        if let Some(uri) = obj.get("uri") {
            if let Some(uri_str) = uri.as_str() {
                if uri_str.starts_with("at://") {
                    return Some(uri_str.to_string());
                }
            }
        }
    }

    None
}