// This file is autogenerated by:
//   cbindgen --config cbindgen.toml src/lib.rs -o include/lib.rs.h
// Don't modify manually.

#pragma once

/* Generated with cbindgen:0.24.2 */

#include <stdint.h>
#include <sys/types.h>

namespace test {
namespace rust {

constexpr static const uintptr_t DNS_HEADER_SIZE = 12;

constexpr static const uintptr_t MAX_UDP_PAYLOAD_SIZE = 1350;

constexpr static const uintptr_t CONN_ID_LEN = 8;

/// Default value for max_idle_timeout transport parameter.
constexpr static const uint64_t QUICHE_IDLE_TIMEOUT_MS = 10000;

/// Default value for initial_max_streams_bidi transport parameter.
constexpr static const uint64_t MAX_STREAMS_BIDI = 100;

/// Frontend object.
struct DohFrontend;

struct Stats {
    /// The number of accumulated DoH queries that are received.
    uint32_t queries_received;
    /// The number of accumulated QUIC connections accepted.
    uint32_t connections_accepted;
    /// The number of QUIC connections alive.
    uint32_t alive_connections;
    /// The number of QUIC connections using session resumption.
    uint32_t resumed_connections;
    /// The number of QUIC connections that received early data.
    uint32_t early_data_connections;
};

extern "C" {

/// Creates a DohFrontend object by the given IP addresss and ports. Returns the pointer of
/// the object if the creation succeeds; otherwise, returns a null pointer.
///
/// # Safety
///
/// The parameters `addr`, `port`, `backend_addr`, and `backend_port` must all point to null
/// terminated UTF-8 encoded strings.
DohFrontend* frontend_new(const char* addr, const char* port, const char* backend_addr,
                          const char* backend_port);

/// Starts the `DohFrontend` worker thread. Returns true if the worker thread is spawned
/// successfully; otherwise, it returns false.
bool frontend_start(DohFrontend* doh);

/// Stops the `DohFrontend` worker thread.
bool frontend_stop(DohFrontend* doh);

/// Deletes the `DohFrontend` created from `frontend_new`.
/// If the caller has called `frontend_start` to start `DohFrontend`, it has to call
/// call `frontend_stop` to stop the worker thread before deleting the object.
///
/// # Safety
///
/// The DohFrontend is not set to null pointer, caller needs to do it on its own.
void frontend_delete(DohFrontend* doh);

/// Sets server certificate to `DohFrontend`.
///
/// # Safety
///
/// The given certificate must be a null-terminated UTF-8 encoded string.
bool frontend_set_certificate(DohFrontend* doh, const char* certificate);

/// Sets server private key to `DohFrontend`.
///
/// # Safety
///
/// The given private key must be a null-terminated UTF-8 encoded string.
bool frontend_set_private_key(DohFrontend* doh, const char* private_key);

/// Configures the `DohFrontend` not to process DoH queries until a given number of DoH queries
/// are received. This function works even in the middle of the worker thread.
bool frontend_set_delay_queries(DohFrontend* doh, int32_t count);

/// Configures the `DohFrontend` to use the given value for max_idle_timeout transport parameter.
bool frontend_set_max_idle_timeout(DohFrontend* doh, uint64_t value);

/// Configures the `DohFrontend` to use the given value for these transport parameters.
/// - initial_max_data
/// - initial_max_stream_data_bidi_local
/// - initial_max_stream_data_bidi_remote
/// - initial_max_stream_data_uni
bool frontend_set_max_buffer_size(DohFrontend* doh, uint64_t value);

/// Configures the `DohFrontend` to use the given value for initial_max_streams_bidi transport
/// parameter.
bool frontend_set_max_streams_bidi(DohFrontend* doh, uint64_t value);

/// Sets the `DohFrontend` to block or unblock sending any data.
bool frontend_block_sending(DohFrontend* doh, bool block);

/// If this function is called, the `DohFrontend` will send RESET_STREAM frame as a response
/// instead of a DoH answer on the stream |stream_id|. This will make the client fail to receive
/// this DoH answer.
bool frontend_set_reset_stream_id(DohFrontend* doh, uint64_t stream_id);

/// Gets the statistics of the `DohFrontend` and writes the result to |out|.
bool frontend_stats(DohFrontend* doh, Stats* out);

/// Resets `queries_received` field of `Stats` owned by the `DohFrontend`.
bool frontend_stats_clear_queries(const DohFrontend* doh);

/// Enable Rust debug logging.
void init_android_logger();

}  // extern "C"

}  // namespace rust
}  // namespace test