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use crate::prelude::*;

/// Query the _headers_ of a remote agent's chain.
///
/// The agent activity is only the headers of their source chain.
/// The agent activity is held by the neighbourhood centered on the agent's public key, rather than a content hash like the rest of the DHT.
///
/// The agent activity can be filtered with [ `ChainQueryFilter` ] like a local chain query.
pub fn get_agent_activity(
    agent: AgentPubKey,
    query: ChainQueryFilter,
    request: ActivityRequest,
) -> ExternResult<AgentActivity> {
    host_call::<GetAgentActivityInput, AgentActivity>(
        __get_agent_activity,
        GetAgentActivityInput::new(agent, query, request),
    )
}

/// Walks the source chain in reverse (latest to oldest) filtering by header and/or entry type
///
/// Given a header and entry type, returns an [ `Vec<Element>` ]
///
/// @todo document this better with examples
/// @todo do we want to return elements rather than hashes?
/// @todo implement cap grant/claim usage in terms of query
pub fn query(filter: ChainQueryFilter) -> ExternResult<Vec<Element>> {
    host_call::<ChainQueryFilter, Vec<Element>>(__query, filter)
}