#pragma once

#include "esphome/core/automation.h"
#include "esphome/core/component.h"
#include "esphome/core/defines.h"
#include "esphome/core/helpers.h"

#include <array>
#include <string>
#include <vector>

#ifdef USE_ESP32

#include <esp_bt_defs.h>
#include <esp_gap_ble_api.h>
#include <esp_gattc_api.h>

#include <freertos/FreeRTOS.h>
#include <freertos/semphr.h>

#include "esphome/components/esp32_ble/ble.h"
#include "esphome/components/esp32_ble/ble_uuid.h"

namespace esphome {
namespace esp32_ble_tracker {

using namespace esp32_ble;

using adv_data_t = std::vector<uint8_t>;

enum AdvertisementParserType {
  PARSED_ADVERTISEMENTS,
  RAW_ADVERTISEMENTS,
};

struct ServiceData {
  ESPBTUUID uuid;
  adv_data_t data;
};

class ESPBLEiBeacon {
 public:
  ESPBLEiBeacon() { memset(&this->beacon_data_, 0, sizeof(this->beacon_data_)); }
  ESPBLEiBeacon(const uint8_t *data);
  static optional<ESPBLEiBeacon> from_manufacturer_data(const ServiceData &data);

  uint16_t get_major() { return byteswap(this->beacon_data_.major); }
  uint16_t get_minor() { return byteswap(this->beacon_data_.minor); }
  int8_t get_signal_power() { return this->beacon_data_.signal_power; }
  ESPBTUUID get_uuid() { return ESPBTUUID::from_raw_reversed(this->beacon_data_.proximity_uuid); }

 protected:
  struct {
    uint8_t sub_type;
    uint8_t length;
    uint8_t proximity_uuid[16];
    uint16_t major;
    uint16_t minor;
    int8_t signal_power;
  } PACKED beacon_data_;
};

class ESPBTDevice {
 public:
  void parse_scan_rst(const esp_ble_gap_cb_param_t::ble_scan_result_evt_param &param);

  std::string address_str() const;

  uint64_t address_uint64() const;

  const uint8_t *address() const { return address_; }

  esp_ble_addr_type_t get_address_type() const { return this->address_type_; }
  int get_rssi() const { return rssi_; }
  const std::string &get_name() const { return this->name_; }

  const std::vector<int8_t> &get_tx_powers() const { return tx_powers_; }

  const optional<uint16_t> &get_appearance() const { return appearance_; }
  const optional<uint8_t> &get_ad_flag() const { return ad_flag_; }
  const std::vector<ESPBTUUID> &get_service_uuids() const { return service_uuids_; }

  const std::vector<ServiceData> &get_manufacturer_datas() const { return manufacturer_datas_; }

  const std::vector<ServiceData> &get_service_datas() const { return service_datas_; }

  const esp_ble_gap_cb_param_t::ble_scan_result_evt_param &get_scan_result() const { return scan_result_; }

  bool resolve_irk(const uint8_t *irk) const;

  optional<ESPBLEiBeacon> get_ibeacon() const {
    for (auto &it : this->manufacturer_datas_) {
      auto res = ESPBLEiBeacon::from_manufacturer_data(it);
      if (res.has_value())
        return *res;
    }
    return {};
  }

 protected:
  void parse_adv_(const esp_ble_gap_cb_param_t::ble_scan_result_evt_param &param);

  esp_bd_addr_t address_{
      0,
  };
  esp_ble_addr_type_t address_type_{BLE_ADDR_TYPE_PUBLIC};
  int rssi_{0};
  std::string name_{};
  std::vector<int8_t> tx_powers_{};
  optional<uint16_t> appearance_{};
  optional<uint8_t> ad_flag_{};
  std::vector<ESPBTUUID> service_uuids_{};
  std::vector<ServiceData> manufacturer_datas_{};
  std::vector<ServiceData> service_datas_{};
  esp_ble_gap_cb_param_t::ble_scan_result_evt_param scan_result_{};
};

class ESP32BLETracker;

class ESPBTDeviceListener {
 public:
  virtual void on_scan_end() {}
  virtual bool parse_device(const ESPBTDevice &device) = 0;
  virtual bool parse_devices(esp_ble_gap_cb_param_t::ble_scan_result_evt_param *advertisements, size_t count) {
    return false;
  };
  virtual AdvertisementParserType get_advertisement_parser_type() {
    return AdvertisementParserType::PARSED_ADVERTISEMENTS;
  };
  void set_parent(ESP32BLETracker *parent) { parent_ = parent; }

 protected:
  ESP32BLETracker *parent_{nullptr};
};

enum class ClientState {
  // Connection is allocated
  INIT,
  // Client is disconnecting
  DISCONNECTING,
  // Connection is idle, no device detected.
  IDLE,
  // Searching for device.
  SEARCHING,
  // Device advertisement found.
  DISCOVERED,
  // Device is discovered and the scanner is stopped
  READY_TO_CONNECT,
  // Connection in progress.
  CONNECTING,
  // Initial connection established.
  CONNECTED,
  // The client and sub-clients have completed setup.
  ESTABLISHED,
};

enum class ScannerState {
  // Scanner is idle, init state, set from the main loop when processing STOPPED
  IDLE,
  // Scanner is starting, set from the main loop only
  STARTING,
  // Scanner is running, set from the ESP callback only
  RUNNING,
  // Scanner failed to start, set from the ESP callback only
  FAILED,
  // Scanner is stopping, set from the main loop only
  STOPPING,
  // Scanner is stopped, set from the ESP callback only
  STOPPED,
};

enum class ConnectionType {
  // The default connection type, we hold all the services in ram
  // for the duration of the connection.
  V1,
  // The client has a cache of the services and mtu so we should not
  // fetch them again
  V3_WITH_CACHE,
  // The client does not need the services and mtu once we send them
  // so we should wipe them from memory as soon as we send them
  V3_WITHOUT_CACHE
};

class ESPBTClient : public ESPBTDeviceListener {
 public:
  virtual bool gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
                                   esp_ble_gattc_cb_param_t *param) = 0;
  virtual void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) = 0;
  virtual void connect() = 0;
  virtual void disconnect() = 0;
  bool disconnect_pending() const { return this->want_disconnect_; }
  void cancel_pending_disconnect() { this->want_disconnect_ = false; }
  virtual void set_state(ClientState st) {
    this->state_ = st;
    if (st == ClientState::IDLE) {
      this->want_disconnect_ = false;
    }
  }
  ClientState state() const { return state_; }
  int app_id;

 protected:
  ClientState state_{ClientState::INIT};
  // want_disconnect_ is set to true when a disconnect is requested
  // while the client is connecting. This is used to disconnect the
  // client as soon as we get the connection id (conn_id_) from the
  // ESP_GATTC_OPEN_EVT event.
  bool want_disconnect_{false};
};

class ESP32BLETracker : public Component,
                        public GAPEventHandler,
                        public GATTcEventHandler,
                        public BLEStatusEventHandler,
                        public Parented<ESP32BLE> {
 public:
  void set_scan_duration(uint32_t scan_duration) { scan_duration_ = scan_duration; }
  void set_scan_interval(uint32_t scan_interval) { scan_interval_ = scan_interval; }
  void set_scan_window(uint32_t scan_window) { scan_window_ = scan_window; }
  void set_scan_active(bool scan_active) { scan_active_ = scan_active; }
  bool get_scan_active() const { return scan_active_; }
  void set_scan_continuous(bool scan_continuous) { scan_continuous_ = scan_continuous; }

  /// Setup the FreeRTOS task and the Bluetooth stack.
  void setup() override;
  void dump_config() override;
  float get_setup_priority() const override;

  void loop() override;

  void register_listener(ESPBTDeviceListener *listener);
  void register_client(ESPBTClient *client);
  void recalculate_advertisement_parser_types();

  void print_bt_device_info(const ESPBTDevice &device);

  void start_scan();
  void stop_scan();

  void gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
                           esp_ble_gattc_cb_param_t *param) override;
  void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) override;
  void ble_before_disabled_event_handler() override;

  void add_scanner_state_callback(std::function<void(ScannerState)> &&callback) {
    this->scanner_state_callbacks_.add(std::move(callback));
  }
  ScannerState get_scanner_state() const { return this->scanner_state_; }

 protected:
  void stop_scan_();
  /// Start a single scan by setting up the parameters and doing some esp-idf calls.
  void start_scan_(bool first);
  /// Called when a scan ends
  void end_of_scan_();
  /// Called when a `ESP_GAP_BLE_SCAN_RESULT_EVT` event is received.
  void gap_scan_result_(const esp_ble_gap_cb_param_t::ble_scan_result_evt_param &param);
  /// Called when a `ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT` event is received.
  void gap_scan_set_param_complete_(const esp_ble_gap_cb_param_t::ble_scan_param_cmpl_evt_param &param);
  /// Called when a `ESP_GAP_BLE_SCAN_START_COMPLETE_EVT` event is received.
  void gap_scan_start_complete_(const esp_ble_gap_cb_param_t::ble_scan_start_cmpl_evt_param &param);
  /// Called when a `ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT` event is received.
  void gap_scan_stop_complete_(const esp_ble_gap_cb_param_t::ble_scan_stop_cmpl_evt_param &param);
  /// Called to set the scanner state. Will also call callbacks to let listeners know when state is changed.
  void set_scanner_state_(ScannerState state);

  int app_id_{0};

  /// Vector of addresses that have already been printed in print_bt_device_info
  std::vector<uint64_t> already_discovered_;
  std::vector<ESPBTDeviceListener *> listeners_;
  /// Client parameters.
  std::vector<ESPBTClient *> clients_;
  /// A structure holding the ESP BLE scan parameters.
  esp_ble_scan_params_t scan_params_;
  /// The interval in seconds to perform scans.
  uint32_t scan_duration_;
  uint32_t scan_interval_;
  uint32_t scan_window_;
  uint8_t scan_start_fail_count_{0};
  bool scan_continuous_;
  bool scan_active_;
  ScannerState scanner_state_{ScannerState::IDLE};
  CallbackManager<void(ScannerState)> scanner_state_callbacks_;
  bool ble_was_disabled_{true};
  bool raw_advertisements_{false};
  bool parse_advertisements_{false};
  SemaphoreHandle_t scan_result_lock_;
  size_t scan_result_index_{0};
#ifdef USE_PSRAM
  const static u_int8_t SCAN_RESULT_BUFFER_SIZE = 32;
#else
  const static u_int8_t SCAN_RESULT_BUFFER_SIZE = 20;
#endif  // USE_PSRAM
  esp_ble_gap_cb_param_t::ble_scan_result_evt_param *scan_result_buffer_;
  esp_bt_status_t scan_start_failed_{ESP_BT_STATUS_SUCCESS};
  esp_bt_status_t scan_set_param_failed_{ESP_BT_STATUS_SUCCESS};
  int connecting_{0};
  int discovered_{0};
  int searching_{0};
  int disconnecting_{0};
#ifdef USE_ESP32_BLE_SOFTWARE_COEXISTENCE
  bool coex_prefer_ble_{false};
#endif
};

// NOLINTNEXTLINE
extern ESP32BLETracker *global_esp32_ble_tracker;

}  // namespace esp32_ble_tracker
}  // namespace esphome

#endif