#pragma once

// BMW I/K-Bus interface configuration
// All values can be overridden via platformio.ini build_flags (-D flags)

// --- UART pin assignments ---
#ifndef IBUS_RX_PIN
#define IBUS_RX_PIN 16
#endif

#ifndef IBUS_TX_PIN
#define IBUS_TX_PIN 17
#endif

#ifndef IBUS_LED_PIN
#define IBUS_LED_PIN 2
#endif

#ifndef IBUS_UART_NUM
#define IBUS_UART_NUM 1
#endif

// --- Protocol timing ---
// Bus must be quiet for this long before we can transmit (microseconds)
#ifndef IBUS_IDLE_TIMEOUT_US
#define IBUS_IDLE_TIMEOUT_US 1500
#endif

// Minimum gap between our own transmitted packets (milliseconds)
#ifndef IBUS_PACKET_GAP_MS
#define IBUS_PACKET_GAP_MS 10
#endif

// Periodic timer resolution for idle detection (microseconds)
// Smaller = more responsive but more CPU overhead. 250us gives
// worst-case detection at idle_timeout + 250us = 1.75ms, well
// within the ~10ms inter-packet budget on a busy bus.
#ifndef IBUS_IDLE_CHECK_US
#define IBUS_IDLE_CHECK_US 250
#endif

// --- Buffer sizes ---
#ifndef IBUS_RX_BUFFER_SIZE
#define IBUS_RX_BUFFER_SIZE 256
#endif

#ifndef IBUS_TX_BUFFER_SIZE
#define IBUS_TX_BUFFER_SIZE 128
#endif

// --- Protocol constants ---
#define IBUS_BAUD       9600
#define IBUS_FRAMING    SERIAL_8E1

// Message length byte must be between these values (inclusive)
#define IBUS_MIN_LENGTH 0x03
#define IBUS_MAX_LENGTH 0x24

// Maximum raw message size (source + length + up to 36 body bytes)
#define IBUS_MAX_MSG    40

// ===================================================================
// OBD-II K-line configuration (ISO 9141 / ISO 14230)
// ===================================================================

// --- UART pin assignments (defaults to same as IBUS — shared hardware) ---
#ifndef KLINE_RX_PIN
#define KLINE_RX_PIN    IBUS_RX_PIN
#endif
#ifndef KLINE_TX_PIN
#define KLINE_TX_PIN    IBUS_TX_PIN
#endif
#ifndef KLINE_LED_PIN
#define KLINE_LED_PIN   IBUS_LED_PIN
#endif
#ifndef KLINE_UART_NUM
#define KLINE_UART_NUM  IBUS_UART_NUM
#endif

// --- Protocol constants ---
#ifndef KLINE_BAUD
#define KLINE_BAUD      10400
#endif
#ifndef KLINE_FRAMING
#define KLINE_FRAMING   SERIAL_8N1
#endif

// TX inversion: 1 for optocoupler (PC817), 0 for transistor circuit
#ifndef KLINE_TX_INVERT
#define KLINE_TX_INVERT 0
#endif

// ISO 9141 default ECU address for 5-baud slow init
#ifndef KLINE_INIT_ADDR
#define KLINE_INIT_ADDR 0x33
#endif