#ifndef UART_H
#define UART_H

#include "esp_err.h"
#include "freertos/idf_additions.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#define UART_NUM UART_NUM_1
#define UART_BAUD_RATE 921600
// #define UART_TXD_PIN 3
// #define UART_RXD_PIN 2

#define UART_TXD_PIN 2
#define UART_RXD_PIN 3


#define UART_BUF_SIZE 4096
/** Driver RX ring — must hold a full OTA block burst (~20 × ~215 B frames). */
#define UART_DRIVER_RX_BUF_SIZE 16384
#define UART_DRIVER_TX_BUF_SIZE 4096
#define START_MARKER 0xAA
#define STOP_MARKER 0xCC
/** Frame: AA | len_lo | len_hi | payload[len] | xor | CC */
#define UART_FRAME_OVERHEAD 5
/**
 * Max application payload (type byte + protobuf). Sized for CLIENT_REGISTRY_MAX
 * aggregations (CLIENT_INFO / BATTERY_STATUS with 16+ samples).
 */
#define MAX_PAYLOAD_SIZE 1024

typedef enum {
  STATE_START,
  STATE_LEN_LO,
  STATE_LEN_HI,
  STATE_DATA,
  STATE_CHECKSUM,
  STATE_STOP
} parser_state_t;

typedef struct {
  uint8_t payload[MAX_PAYLOAD_SIZE];
  uint16_t len;
  uint16_t index;
  uint8_t checksum;
  parser_state_t state;
} uart_packet_t;

typedef struct {
  uint8_t cmd;
} uart_command_t;

void init_uart(QueueHandle_t cmd_queue);
void uart_read_task(void *param);
bool parse_uart_byte(uint8_t byte, uart_packet_t *p);
esp_err_t uart_send_framed(const uint8_t *payload, size_t len);

#endif