/**
 * FlipperDroid Bridge Protocol v0.1
 * Shared definitions between all source files.
 */

#pragma once

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

/* Wire format: [MAGIC_HI][MAGIC_LO][LEN_HI][LEN_LO][CMD][PAYLOAD...][CRC8] */
#define FD_MAGIC_HI    0xFD
#define FD_MAGIC_LO    0x01
#define FD_MAX_PAYLOAD 2048
#define FD_VERSION     "0.1.0"
#define FD_DEVICE_NAME "FlipperDroid"

/* ---- Commands (Phone -> Flipper) ---- */
typedef enum {
    FdCmdPing          = 0x01,
    FdCmdVersion       = 0x02,
    FdCmdCapabilities  = 0x03,
    FdCmdStatus        = 0x04,

    FdCmdGpioInit      = 0x10,
    FdCmdGpioWrite     = 0x11,
    FdCmdGpioRead      = 0x12,
    FdCmdGpioPwm       = 0x13,
    FdCmdGpioAdcRead   = 0x14,

    FdCmdSubghzSetFreq = 0x20,
    FdCmdSubghzTx      = 0x21,
    FdCmdSubghzRxStart = 0x22,
    FdCmdSubghzRxStop  = 0x23,
    FdCmdSubghzGetRssi = 0x24,

    FdCmdIrTx          = 0x50,
    FdCmdIrTxRaw       = 0x51,
    FdCmdIrRxStart     = 0x52,
    FdCmdIrRxStop      = 0x53,

    FdCmdFileList      = 0x90,
    FdCmdFileRead      = 0x91,
    FdCmdFileWrite     = 0x92,
    FdCmdFileDelete    = 0x93,
} FdCommand;

/* ---- Events (Flipper -> Phone, async push) ---- */
typedef enum {
    FdEventGpioIrq   = 0xA0,
    FdEventSubghzRx  = 0xA1,
    FdEventIrRx      = 0xA2,
    FdEventButton    = 0xA4,
    FdEventCpuReq    = 0xA5,
} FdEvent;

/* Response / Error */
#define FD_RESP_OK   0xFE
#define FD_RESP_ERR  0xFF

typedef enum {
    FdErrUnknownCmd    = 0x01,
    FdErrInvalidParams = 0x02,
    FdErrDisabled      = 0x03,
    FdErrHardware      = 0x04,
    FdErrBusy          = 0x05,
    FdErrTimeout       = 0x06,
    FdErrNotSupported  = 0x07,
} FdError;

/* Capability bitmask reported by 0x03 */
#define FD_CAP_GPIO    (1 << 0)
#define FD_CAP_SUBGHZ  (1 << 1)
#define FD_CAP_RFID    (1 << 2)
#define FD_CAP_NFC     (1 << 3)
#define FD_CAP_IR      (1 << 4)
#define FD_CAP_IBUTTON (1 << 5)
#define FD_CAP_BADUSB  (1 << 6)
#define FD_CAP_CPU     (1 << 7)

/* CRC8 Dallas/Maxim 0x31 */
static inline uint8_t fd_crc8(const uint8_t* data, uint16_t len) {
    uint8_t crc = 0;
    for(uint16_t i = 0; i < len; i++) {
        crc ^= data[i];
        for(uint8_t j = 0; j < 8; j++)
            crc = (crc & 0x80) ? ((crc << 1) ^ 0x31) : (crc << 1);
    }
    return crc;
}