#pragma once

/* Shared HID mixer protocol (firmware + host) */

#define AUSIO_USB_VID           0x2E8Au
#define AUSIO_USB_PID           0xA541u

#define AUSIO_REPORT_ID_INPUT   1
#define AUSIO_REPORT_ID_OUTPUT  2

#define AUSIO_INPUT_SIZE        8   /* including report id */
#define AUSIO_OUTPUT_SIZE       64  /* including report id */

#define AUSIO_FLAG_E1_SW        0x01u
#define AUSIO_FLAG_E2_SW        0x02u

#define AUSIO_NAME_CHARS        12
/* vol + peak + name[12] (name zero-padded, no extra NUL byte) */
#define AUSIO_SLOT_SIZE         (1 + 1 + AUSIO_NAME_CHARS)
#define AUSIO_MAX_VISIBLE       4
/* report_id + count + selected + master_vol + page + n_vis + master_peak */
#define AUSIO_HDR_SIZE          7

#if (AUSIO_HDR_SIZE + AUSIO_MAX_VISIBLE * AUSIO_SLOT_SIZE) > AUSIO_OUTPUT_SIZE
#error protocol packing overflow
#endif

/*
 * Input report (device -> host), 8 bytes:
 *  [0] report_id = 1
 *  [1] enc1_delta int8
 *  [2] enc2_delta int8
 *  [3] flags
 *  [4] pot 0..100
 *  [5..7] reserved
 *
 * Output report (host -> device), 64 bytes:
 *  [0] report_id = 2
 *  [1] session_count
 *  [2] selected_index
 *  [3] master_vol 0..100
 *  [4] page_start
 *  [5] n_visible (0..4)
 *  [6] master_peak 0..100
 *  [7..] slots: { uint8 vol; uint8 peak; char name[12]; } * n_visible
 */