#pragma once

#include <stdbool.h>
#include <stdint.h>

#include "esp_err.h"
#include "session_broker.h"

#ifdef __cplusplus
extern "C" {
#endif

/* USB CDC line-coding values are the numeric encodings defined by USB PSTN. */
#define USB_CDC_TRANSPORT_STOP_BITS_1 0U
#define USB_CDC_TRANSPORT_STOP_BITS_1_5 1U
#define USB_CDC_TRANSPORT_STOP_BITS_2 2U

#define USB_CDC_TRANSPORT_PARITY_NONE 0U
#define USB_CDC_TRANSPORT_PARITY_ODD 1U
#define USB_CDC_TRANSPORT_PARITY_EVEN 2U
#define USB_CDC_TRANSPORT_PARITY_MARK 3U
#define USB_CDC_TRANSPORT_PARITY_SPACE 4U

typedef struct {
    uint32_t baud_rate;
    uint8_t stop_bits;
    uint8_t parity;
    uint8_t data_bits;
} usb_cdc_transport_line_coding_t;

typedef struct {
    uint64_t host_rx_bytes;
    uint64_t host_rx_stream_dropped_bytes;
    uint64_t broker_accepted_bytes;
    uint64_t broker_rejected_bytes;
    uint64_t broker_to_usb_bytes;
    /* Bytes admitted to TinyUSB's TX FIFO, not a host-delivery acknowledgement. */
    uint64_t usb_tx_queued_bytes;
    uint64_t usb_tx_dropped_bytes;
    uint64_t connections;
    uint64_t disconnections;
    uint64_t writer_grants;
    uint64_t writer_denials;
    uint64_t writer_revocations;
    uint64_t writer_events;
    uint64_t service_start_failures;
    uint64_t line_coding_applied;
    uint64_t line_coding_rejected;
    uint64_t line_coding_failed;
    uint64_t callback_drops;
    uint64_t control_drops;
} usb_cdc_transport_counters_t;

typedef struct {
    bool initialized;
    bool attached;
    bool dtr;
    bool rts;
    session_broker_client_id_t broker_client_id;
    bool writer;
    usb_cdc_transport_line_coding_t line_coding;
    usb_cdc_transport_counters_t counters;
} usb_cdc_transport_snapshot_t;

/*
 * Installs the native ESP32-S3 USB-OTG device on GPIO19/20 as CDC-ACM 0.
 * UART0 console/logging configuration is not changed.
 */
esp_err_t usb_cdc_transport_init(void);

esp_err_t usb_cdc_transport_get_snapshot(usb_cdc_transport_snapshot_t *snapshot);

/* Requests are asynchronous and execute in the transport task. */
esp_err_t usb_cdc_transport_request_writer(void);
esp_err_t usb_cdc_transport_release_writer(void);

/* Clearing counters does not alter connection, ownership, or queued data. */
esp_err_t usb_cdc_transport_clear_counters(void);

#ifdef __cplusplus
}
#endif