"""cffi-декларации поверх include/fgl-aircon/c_api.h (ABI-режим, dlopen).

Библиотека ищется в порядке: $FGL_AIRCON_LIB, рядом с пакетом
(pyfglair/libfgl-aircon.so*), затем по системному имени (ldconfig).
"""
from __future__ import annotations

import ctypes.util
import os
import re
from pathlib import Path

from cffi import FFI

ffi = FFI()

ffi.cdef(
    """
const char* fgl_version(void);

typedef void (*fgl_log_sink_fn)(int level, const char* msg, unsigned len,
                                void* ctx);
void fgl_log_set_sink(fgl_log_sink_fn sink, void* ctx);
void fgl_log_set_level(int min_level);

typedef enum {
  FGL_STATE_IDLE = 0,
  FGL_STATE_REGISTERING = 1,
  FGL_STATE_ONLINE = 2,
  FGL_STATE_RECOVERING = 3,
  FGL_STATE_OFFLINE = 4,
  FGL_STATE_KEY_ERROR = 5,
} fgl_state_t;

typedef enum {
  FGL_ERR_NONE = 0,
  FGL_ERR_NO_SLOT = 1,
  FGL_ERR_UNREACHABLE = 2,
  FGL_ERR_KEY_MISMATCH = 3,
  FGL_ERR_BAD_KEY_EXCHANGE = 4,
  FGL_ERR_ACTIVATION_TIMEOUT = 5,
  FGL_ERR_DECRYPT_FAILED = 6,
} fgl_error_t;

typedef enum {
  FGL_PROP_OPERATION_MODE = 0,
  FGL_PROP_FAN_SPEED = 1,
  FGL_PROP_ADJUST_TEMPERATURE = 2,
  FGL_PROP_DISPLAY_TEMPERATURE = 3,
  FGL_PROP_AF_VERTICAL_DIRECTION = 4,
  FGL_PROP_AF_VERTICAL_SWING = 5,
  FGL_PROP_AF_HORIZONTAL_DIRECTION = 6,
  FGL_PROP_AF_HORIZONTAL_SWING = 7,
  FGL_PROP_AF_VERTICAL_MOVE_STEP1 = 8,
  FGL_PROP_AF_HORIZONTAL_MOVE_STEP1 = 9,
  FGL_PROP_OUTDOOR_LOW_NOISE = 10,
  FGL_PROP_INDOOR_FAN_CONTROL = 11,
  FGL_PROP_HUMAN_DET_AUTO_SAVE = 12,
  FGL_PROP_MIN_HEAT = 13,
  FGL_PROP_POWERFUL_MODE = 14,
  FGL_PROP_COIL_DRY_MODE = 15,
  FGL_PROP_ECONOMY_MODE = 16,
  FGL_PROP_MASTER_TIMER_ON_OFF_1 = 17,
  FGL_PROP_MASTER_TIMER_ON_OFF_2 = 18,
  FGL_PROP_ERROR_CODE = 19,
  FGL_PROP_DEMAND_CONTROL = 20,
  FGL_PROP_FILTER_SIGN_RESET_DISPLAY = 21,
  FGL_PROP_FILTER_SIGN_RESET = 22,
  FGL_PROP_OP_STATUS = 23,
  FGL_PROP_DEVICE_NAME = 24,
  FGL_PROP_BUILDING_NAME = 25,
  FGL_PROP_WIFI_LED_ENABLE = 26,
  FGL_PROP_SERVICE_CONTACT_NAME = 27,
  FGL_PROP_SERVICE_CONTACT_PHONE = 28,
  FGL_PROP_SERVICE_CONTACT_EMAIL = 29,
  FGL_PROP_AF_HORIZONTAL_NUM_DIR = 30,
  FGL_PROP_AF_VERTICAL_NUM_DIR = 31,
  FGL_PROP_DEVICE_CAPABILITIES = 32,
  FGL_PROP_GET_PROP = 33,
  FGL_PROP_HUMAN_DET = 34,
  FGL_PROP_MONITOR1 = 35,
  FGL_PROP_REFRESH = 36,
  FGL_PROP_COUNT = 37,
} fgl_prop_t;

typedef enum {
  FGL_VALUE_INT = 0,
  FGL_VALUE_BOOL = 1,
  FGL_VALUE_STRING = 2,
} fgl_value_kind_t;

typedef struct {
  fgl_value_kind_t kind;
  int64_t i;
  char s[64];
} fgl_value_t;

typedef enum {
  FGL_TEMPLATE_A = 0,
  FGL_TEMPLATE_B = 1,
  FGL_TEMPLATE_F = 2,
} fgl_template_t;

typedef struct {
  const char* host;
  uint16_t device_port;
  const char* dsn;
  const char* lanip_key;
  uint32_t lanip_key_id;
  fgl_template_t tmpl;
  uint16_t listen_port;
  uint32_t keepalive_ms;
  uint8_t max_queue;
} fgl_config_t;

typedef struct {
  fgl_prop_t prop;
  int32_t cmd_id;
  int32_t status;
  fgl_value_t value;
} fgl_property_event_t;

typedef void (*fgl_on_state_fn)(void* ctx, fgl_state_t st, fgl_error_t err);
typedef void (*fgl_on_property_fn)(void* ctx,
                                   const fgl_property_event_t* ev);

typedef struct {
  fgl_on_state_fn on_state;
  fgl_on_property_fn on_property;
  void* ctx;
} fgl_callbacks_t;

typedef struct fgl_session fgl_session_t;

typedef enum {
  FGL_EVENT_STATE = 0,
  FGL_EVENT_PROPERTY = 1,
} fgl_event_type_t;

typedef struct {
  int level;
  char msg[160];
} fgl_log_event_t;

typedef struct {
  fgl_event_type_t type;
  union {
    struct {
      fgl_state_t state;
      fgl_error_t error;
    } state;
    fgl_property_event_t property;
  } data;
} fgl_event_t;

fgl_session_t* fgl_session_create(const fgl_config_t* cfg,
                                  const fgl_callbacks_t* cbs);
void fgl_session_destroy(fgl_session_t* s);
int fgl_session_start(fgl_session_t* s);
void fgl_session_stop(fgl_session_t* s);
fgl_state_t fgl_session_state(const fgl_session_t* s);
fgl_error_t fgl_session_last_error(const fgl_session_t* s);

int fgl_session_set_int(fgl_session_t* s, fgl_prop_t prop, int64_t value);
int fgl_session_set_bool(fgl_session_t* s, fgl_prop_t prop, int value);
int fgl_session_set_string(fgl_session_t* s, fgl_prop_t prop,
                           const char* value);
int fgl_session_get_prop(fgl_session_t* s, fgl_prop_t prop);

int fgl_session_batch_begin(fgl_session_t* s);
int fgl_session_batch_commit(fgl_session_t* s);
int fgl_session_batch_abort(fgl_session_t* s);

int fgl_session_cached(const fgl_session_t* s, fgl_prop_t prop,
                       fgl_value_t* out);

int fgl_session_poll_events(fgl_session_t* s, fgl_event_t* out, int max_events);
int fgl_session_wait_events(fgl_session_t* s, fgl_event_t* out, int max_events,
                            int timeout_ms);
uint64_t fgl_session_events_dropped(const fgl_session_t* s);
uint64_t fgl_log_events_dropped(void);
int fgl_log_poll_events(fgl_log_event_t* out, int max_events);
int fgl_log_wait_events(fgl_log_event_t* out, int max_events, int timeout_ms);

int fgl_template_detect(const char* oem_model);
const char* fgl_prop_name(fgl_template_t t, fgl_prop_t prop);
const char* fgl_prop_base_type(fgl_template_t t, fgl_prop_t prop);
int fgl_prop_read_only(fgl_template_t t, fgl_prop_t prop);
int fgl_prop_raw_range(fgl_template_t t, fgl_prop_t prop, int64_t* min,
                       int64_t* max);
int64_t fgl_convert_to_display(fgl_template_t t, fgl_prop_t prop,
                               int64_t raw);
int64_t fgl_convert_from_input(fgl_template_t t, fgl_prop_t prop,
                               int64_t api_value);
"""
)

_cdll = None


def find_library() -> str:
    env = os.environ.get("FGL_AIRCON_LIB")
    if env:
        if not Path(env).exists():
            raise FileNotFoundError(f"FGL_AIRCON_LIB={env} не существует")
        return env
    pkg = Path(__file__).resolve().parent
    pattern = re.compile(r"^libfgl-aircon\.(so(\.[0-9.]+)?|dylib|\d+\.dylib)$")
    candidates = sorted(
        (p for p in pkg.iterdir() if p.is_file() and pattern.match(p.name)),
        key=lambda p: (p.name.count("."), len(p.name)),
    )
    if candidates:
        return str(candidates[0])
    system = ctypes.util.find_library("fgl-aircon")
    if system:
        return system
    raise OSError(
        "библиотека fgl-aircon не найдена. Соберите её из корня монорепо: "
        "python -m pyfglair._corebuild --inplace (или задайте FGL_AIRCON_LIB)"
    )


def get_library():
    """dlopen ядра (однократно на процесс)."""
    global _cdll
    if _cdll is None:
        _cdll = ffi.dlopen(find_library())
    return _cdll


lib = get_library()