from __future__ import annotations

from dataclasses import dataclass
import logging

from esphome import automation
import esphome.codegen as cg
from esphome.components import esp32_ble, ota
from esphome.components.esp32 import (
    add_idf_sdkconfig_option,
    request_bluetooth,
    request_software_coexistence,
)
from esphome.components.esp32_ble import (
    IDF_MAX_CONNECTIONS,
    BTLoggers,
    bt_uuid,
    bt_uuid16_format,
    bt_uuid32_format,
    bt_uuid128_format,
)
import esphome.config_validation as cv
from esphome.const import (
    CONF_ACTIVE,
    CONF_CONTINUOUS,
    CONF_DURATION,
    CONF_ID,
    CONF_INTERVAL,
    CONF_MAC_ADDRESS,
    CONF_MANUFACTURER_ID,
    CONF_MAX_CONNECTIONS,
    CONF_ON_BLE_ADVERTISE,
    CONF_ON_BLE_MANUFACTURER_DATA_ADVERTISE,
    CONF_ON_BLE_SERVICE_DATA_ADVERTISE,
    CONF_SERVICE_UUID,
    CONF_TRIGGER_ID,
)
from esphome.core import CORE, CoroPriority, coroutine_with_priority
from esphome.enum import StrEnum
from esphome.types import ConfigType

AUTO_LOAD = ["esp32_ble"]
DEPENDENCIES = ["esp32"]
CODEOWNERS = ["@bdraco"]

CONF_ESP32_BLE_ID = "esp32_ble_id"
CONF_SCAN_PARAMETERS = "scan_parameters"
CONF_WINDOW = "window"
CONF_ON_SCAN_END = "on_scan_end"
CONF_SOFTWARE_COEXISTENCE = "software_coexistence"

_LOGGER = logging.getLogger(__name__)


# Enum for BLE features
class BLEFeatures(StrEnum):
    ESP_BT_DEVICE = "ESP_BT_DEVICE"


# Dataclass for registration counts
@dataclass
class RegistrationCounts:
    listeners: int = 0
    clients: int = 0


# CORE.data keys for state management
ESP32_BLE_TRACKER_REQUIRED_FEATURES_KEY = "esp32_ble_tracker_required_features"
ESP32_BLE_TRACKER_REGISTRATION_COUNTS_KEY = "esp32_ble_tracker_registration_counts"


def _get_required_features() -> set[BLEFeatures]:
    """Get the set of required BLE features from CORE.data."""
    return CORE.data.setdefault(ESP32_BLE_TRACKER_REQUIRED_FEATURES_KEY, set())


def _get_registration_counts() -> RegistrationCounts:
    """Get the registration counts from CORE.data."""
    return CORE.data.setdefault(
        ESP32_BLE_TRACKER_REGISTRATION_COUNTS_KEY, RegistrationCounts()
    )


def register_ble_features(features: set[BLEFeatures]) -> None:
    """Register BLE features that a component needs.

    Args:
        features: Set of BLEFeatures enum members
    """
    _get_required_features().update(features)


esp32_ble_tracker_ns = cg.esphome_ns.namespace("esp32_ble_tracker")
ESP32BLETracker = esp32_ble_tracker_ns.class_(
    "ESP32BLETracker",
    cg.Component,
    cg.Parented.template(esp32_ble.ESP32BLE),
)
ESPBTClient = esp32_ble_tracker_ns.class_("ESPBTClient")
ESPBTDeviceListener = esp32_ble_tracker_ns.class_("ESPBTDeviceListener")
ESPBTDevice = esp32_ble_tracker_ns.class_("ESPBTDevice")
ESPBTDeviceConstRef = ESPBTDevice.operator("ref").operator("const")
adv_data_t = cg.std_vector.template(cg.uint8)
adv_data_t_const_ref = adv_data_t.operator("ref").operator("const")
# Triggers
ESPBTAdvertiseTrigger = esp32_ble_tracker_ns.class_(
    "ESPBTAdvertiseTrigger", automation.Trigger.template(ESPBTDeviceConstRef)
)
BLEServiceDataAdvertiseTrigger = esp32_ble_tracker_ns.class_(
    "BLEServiceDataAdvertiseTrigger", automation.Trigger.template(adv_data_t_const_ref)
)
BLEManufacturerDataAdvertiseTrigger = esp32_ble_tracker_ns.class_(
    "BLEManufacturerDataAdvertiseTrigger",
    automation.Trigger.template(adv_data_t_const_ref),
)
BLEEndOfScanTrigger = esp32_ble_tracker_ns.class_(
    "BLEEndOfScanTrigger", automation.Trigger.template()
)
# Actions
ESP32BLEStartScanAction = esp32_ble_tracker_ns.class_(
    "ESP32BLEStartScanAction", automation.Action
)
ESP32BLEStopScanAction = esp32_ble_tracker_ns.class_(
    "ESP32BLEStopScanAction", automation.Action
)


def validate_scan_parameters(config):
    duration = config[CONF_DURATION]
    interval = config[CONF_INTERVAL]
    window = config[CONF_WINDOW]

    if window > interval:
        raise cv.Invalid(
            f"Scan window ({window}) needs to be smaller than scan interval ({interval})"
        )

    if interval.total_milliseconds * 3 > duration.total_milliseconds:
        raise cv.Invalid(
            "Scan duration needs to be at least three times the scan interval to"
            "cover all BLE channels."
        )

    return config


def validate_max_connections_deprecated(config: ConfigType) -> ConfigType:
    if CONF_MAX_CONNECTIONS in config:
        _LOGGER.warning(
            "The 'max_connections' option in 'esp32_ble_tracker' is deprecated. "
            "Please move it to the 'esp32_ble' component instead."
        )
    return config


def as_hex(value):
    return cg.RawExpression(f"0x{value}ULL")


def as_hex_array(value):
    value = value.replace("-", "")
    cpp_array = [
        f"0x{part}" for part in [value[i : i + 2] for i in range(0, len(value), 2)]
    ]
    return cg.RawExpression(f"(uint8_t*)(const uint8_t[16]){{{','.join(cpp_array)}}}")


def as_reversed_hex_array(value):
    value = value.replace("-", "")
    cpp_array = [
        f"0x{part}" for part in [value[i : i + 2] for i in range(0, len(value), 2)]
    ]
    return cg.RawExpression(
        f"(uint8_t*)(const uint8_t[16]){{{','.join(reversed(cpp_array))}}}"
    )


CONFIG_SCHEMA = cv.All(
    cv.Schema(
        {
            cv.GenerateID(): cv.declare_id(ESP32BLETracker),
            cv.GenerateID(esp32_ble.CONF_BLE_ID): cv.use_id(esp32_ble.ESP32BLE),
            cv.Optional(CONF_MAX_CONNECTIONS): cv.All(
                cv.positive_int, cv.Range(min=0, max=IDF_MAX_CONNECTIONS)
            ),
            cv.Optional(CONF_SCAN_PARAMETERS, default={}): cv.All(
                cv.Schema(
                    {
                        cv.Optional(
                            CONF_DURATION, default="5min"
                        ): cv.positive_time_period_seconds,
                        cv.Optional(
                            CONF_INTERVAL, default="320ms"
                        ): cv.positive_time_period_milliseconds,
                        cv.Optional(
                            CONF_WINDOW, default="30ms"
                        ): cv.positive_time_period_milliseconds,
                        cv.Optional(CONF_ACTIVE, default=True): cv.boolean,
                        cv.Optional(CONF_CONTINUOUS, default=True): cv.boolean,
                    }
                ),
                validate_scan_parameters,
            ),
            cv.Optional(CONF_ON_BLE_ADVERTISE): automation.validate_automation(
                {
                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
                        ESPBTAdvertiseTrigger
                    ),
                    cv.Optional(CONF_MAC_ADDRESS): cv.ensure_list(cv.mac_address),
                }
            ),
            cv.Optional(
                CONF_ON_BLE_SERVICE_DATA_ADVERTISE
            ): automation.validate_automation(
                {
                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
                        BLEServiceDataAdvertiseTrigger
                    ),
                    cv.Optional(CONF_MAC_ADDRESS): cv.mac_address,
                    cv.Required(CONF_SERVICE_UUID): bt_uuid,
                }
            ),
            cv.Optional(
                CONF_ON_BLE_MANUFACTURER_DATA_ADVERTISE
            ): automation.validate_automation(
                {
                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
                        BLEManufacturerDataAdvertiseTrigger
                    ),
                    cv.Optional(CONF_MAC_ADDRESS): cv.mac_address,
                    cv.Required(CONF_MANUFACTURER_ID): bt_uuid,
                }
            ),
            cv.Optional(CONF_ON_SCAN_END): automation.validate_automation(
                {cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(BLEEndOfScanTrigger)}
            ),
            cv.OnlyWith(CONF_SOFTWARE_COEXISTENCE, "wifi", default=True): bool,
        }
    ).extend(cv.COMPONENT_SCHEMA),
    validate_max_connections_deprecated,
)


FINAL_VALIDATE_SCHEMA = esp32_ble.validate_variant

ESP_BLE_DEVICE_SCHEMA = cv.Schema(
    {
        cv.GenerateID(CONF_ESP32_BLE_ID): cv.use_id(ESP32BLETracker),
    }
)


async def to_code(config):
    # Register the loggers this component needs
    esp32_ble.register_bt_logger(BTLoggers.BLE_SCAN)

    var = cg.new_Pvariable(config[CONF_ID])
    await cg.register_component(var, config)

    parent = await cg.get_variable(config[esp32_ble.CONF_BLE_ID])
    esp32_ble.register_gap_event_handler(parent, var)
    esp32_ble.register_gap_scan_event_handler(parent, var)
    esp32_ble.register_gattc_event_handler(parent, var)
    esp32_ble.register_ble_status_event_handler(parent, var)
    cg.add(var.set_parent(parent))

    params = config[CONF_SCAN_PARAMETERS]
    cg.add(var.set_scan_duration(params[CONF_DURATION]))
    cg.add(var.set_scan_interval(int(params[CONF_INTERVAL].total_milliseconds / 0.625)))
    cg.add(var.set_scan_window(int(params[CONF_WINDOW].total_milliseconds / 0.625)))
    cg.add(var.set_scan_active(params[CONF_ACTIVE]))
    cg.add(var.set_scan_continuous(params[CONF_CONTINUOUS]))

    # Register ESP_BT_DEVICE feature if any of the automation triggers are used
    if (
        config.get(CONF_ON_BLE_ADVERTISE)
        or config.get(CONF_ON_BLE_SERVICE_DATA_ADVERTISE)
        or config.get(CONF_ON_BLE_MANUFACTURER_DATA_ADVERTISE)
    ):
        register_ble_features({BLEFeatures.ESP_BT_DEVICE})

    registration_counts = _get_registration_counts()

    for conf in config.get(CONF_ON_BLE_ADVERTISE, []):
        registration_counts.listeners += 1
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        if CONF_MAC_ADDRESS in conf:
            addr_list = [it.as_hex for it in conf[CONF_MAC_ADDRESS]]
            cg.add(trigger.set_addresses(addr_list))
        await automation.build_automation(trigger, [(ESPBTDeviceConstRef, "x")], conf)
    for conf in config.get(CONF_ON_BLE_SERVICE_DATA_ADVERTISE, []):
        registration_counts.listeners += 1
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        if len(conf[CONF_SERVICE_UUID]) == len(bt_uuid16_format):
            cg.add(trigger.set_service_uuid16(as_hex(conf[CONF_SERVICE_UUID])))
        elif len(conf[CONF_SERVICE_UUID]) == len(bt_uuid32_format):
            cg.add(trigger.set_service_uuid32(as_hex(conf[CONF_SERVICE_UUID])))
        elif len(conf[CONF_SERVICE_UUID]) == len(bt_uuid128_format):
            uuid128 = as_reversed_hex_array(conf[CONF_SERVICE_UUID])
            cg.add(trigger.set_service_uuid128(uuid128))
        if CONF_MAC_ADDRESS in conf:
            cg.add(trigger.set_address(conf[CONF_MAC_ADDRESS].as_hex))
        await automation.build_automation(trigger, [(adv_data_t_const_ref, "x")], conf)
    for conf in config.get(CONF_ON_BLE_MANUFACTURER_DATA_ADVERTISE, []):
        registration_counts.listeners += 1
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        if len(conf[CONF_MANUFACTURER_ID]) == len(bt_uuid16_format):
            cg.add(trigger.set_manufacturer_uuid16(as_hex(conf[CONF_MANUFACTURER_ID])))
        elif len(conf[CONF_MANUFACTURER_ID]) == len(bt_uuid32_format):
            cg.add(trigger.set_manufacturer_uuid32(as_hex(conf[CONF_MANUFACTURER_ID])))
        elif len(conf[CONF_MANUFACTURER_ID]) == len(bt_uuid128_format):
            uuid128 = as_reversed_hex_array(conf[CONF_MANUFACTURER_ID])
            cg.add(trigger.set_manufacturer_uuid128(uuid128))
        if CONF_MAC_ADDRESS in conf:
            cg.add(trigger.set_address(conf[CONF_MAC_ADDRESS].as_hex))
        await automation.build_automation(trigger, [(adv_data_t_const_ref, "x")], conf)
    for conf in config.get(CONF_ON_SCAN_END, []):
        registration_counts.listeners += 1
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        await automation.build_automation(trigger, [], conf)

    request_bluetooth()
    if config.get(CONF_SOFTWARE_COEXISTENCE):
        request_software_coexistence()
    # https://github.com/espressif/esp-idf/issues/4101
    # https://github.com/espressif/esp-idf/issues/2503
    # Match arduino CONFIG_BTU_TASK_STACK_SIZE
    # https://github.com/espressif/arduino-esp32/blob/fd72cf46ad6fc1a6de99c1d83ba8eba17d80a4ee/tools/sdk/esp32/sdkconfig#L1866
    add_idf_sdkconfig_option("CONFIG_BT_BTU_TASK_STACK_SIZE", 8192)
    # Note: CONFIG_BT_ACL_CONNECTIONS and CONFIG_BTDM_CTRL_BLE_MAX_CONN are now
    # configured in esp32_ble component based on max_connections setting

    ota.request_ota_state_listeners()  # To be notified when an OTA update starts
    cg.add_define("USE_ESP32_BLE_CLIENT")

    CORE.add_job(_add_ble_features)

    if config.get(CONF_SOFTWARE_COEXISTENCE):
        cg.add_define("USE_ESP32_BLE_SOFTWARE_COEXISTENCE")


# This needs to be run as a job with very low priority so that all components have
# chance to call register_ble_tracker and register_client before the list is checked
# and added to the global defines list.
@coroutine_with_priority(CoroPriority.FINAL)
async def _add_ble_features():
    # Add feature-specific defines based on what's needed
    required_features = _get_required_features()
    if BLEFeatures.ESP_BT_DEVICE in required_features:
        cg.add_define("USE_ESP32_BLE_DEVICE")
        cg.add_define("USE_ESP32_BLE_UUID")

    # Add defines for StaticVector sizing based on registration counts
    # Only define if count > 0 to avoid allocating unnecessary memory
    registration_counts = _get_registration_counts()
    if registration_counts.listeners > 0:
        cg.add_define(
            "ESPHOME_ESP32_BLE_TRACKER_LISTENER_COUNT", registration_counts.listeners
        )
    if registration_counts.clients > 0:
        cg.add_define(
            "ESPHOME_ESP32_BLE_TRACKER_CLIENT_COUNT", registration_counts.clients
        )


ESP32_BLE_START_SCAN_ACTION_SCHEMA = cv.Schema(
    {
        cv.GenerateID(): cv.use_id(ESP32BLETracker),
        cv.Optional(CONF_CONTINUOUS, default=False): cv.templatable(cv.boolean),
    }
)


@automation.register_action(
    "esp32_ble_tracker.start_scan",
    ESP32BLEStartScanAction,
    ESP32_BLE_START_SCAN_ACTION_SCHEMA,
    synchronous=True,
)
async def esp32_ble_tracker_start_scan_action_to_code(
    config, action_id, template_arg, args
):
    paren = await cg.get_variable(config[CONF_ID])
    var = cg.new_Pvariable(action_id, template_arg, paren)
    template_ = await cg.templatable(config[CONF_CONTINUOUS], args, cg.bool_)
    cg.add(var.set_continuous(template_))
    return var


ESP32_BLE_STOP_SCAN_ACTION_SCHEMA = automation.maybe_simple_id(
    cv.Schema(
        {
            cv.GenerateID(): cv.use_id(ESP32BLETracker),
        }
    )
)


@automation.register_action(
    "esp32_ble_tracker.stop_scan",
    ESP32BLEStopScanAction,
    ESP32_BLE_STOP_SCAN_ACTION_SCHEMA,
    synchronous=True,
)
async def esp32_ble_tracker_stop_scan_action_to_code(
    config, action_id, template_arg, args
):
    var = cg.new_Pvariable(action_id, template_arg)
    await cg.register_parented(var, config[CONF_ID])
    return var


async def register_ble_device(
    var: cg.SafeExpType, config: ConfigType
) -> cg.SafeExpType:
    register_ble_features({BLEFeatures.ESP_BT_DEVICE})
    _get_registration_counts().listeners += 1
    paren = await cg.get_variable(config[CONF_ESP32_BLE_ID])
    cg.add(paren.register_listener(var))
    return var


async def register_client(var: cg.SafeExpType, config: ConfigType) -> cg.SafeExpType:
    register_ble_features({BLEFeatures.ESP_BT_DEVICE})
    _get_registration_counts().clients += 1
    paren = await cg.get_variable(config[CONF_ESP32_BLE_ID])
    cg.add(paren.register_client(var))
    return var


async def register_raw_ble_device(
    var: cg.SafeExpType, config: ConfigType
) -> cg.SafeExpType:
    """Register a BLE device listener that only needs raw advertisement data.

    This does NOT register the ESP_BT_DEVICE feature, meaning ESPBTDevice
    will not be compiled in if this is the only registration method used.
    """
    _get_registration_counts().listeners += 1
    paren = await cg.get_variable(config[CONF_ESP32_BLE_ID])
    cg.add(paren.register_listener(var))
    return var


async def register_raw_client(
    var: cg.SafeExpType, config: ConfigType
) -> cg.SafeExpType:
    """Register a BLE client that only needs raw advertisement data.

    This does NOT register the ESP_BT_DEVICE feature, meaning ESPBTDevice
    will not be compiled in if this is the only registration method used.
    """
    _get_registration_counts().clients += 1
    paren = await cg.get_variable(config[CONF_ESP32_BLE_ID])
    cg.add(paren.register_client(var))
    return var
