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#include <stdio.h>
#include <stdint.h>
#include <string.h>

#include "esp_bt.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "esp_bt_defs.h"
#include "esp_bt_main.h"
#include "esp_gatt_defs.h"
#include "esp_gattc_api.h"
#include "esp_gap_ble_api.h"
#include "freertos/FreeRTOS.h"
#include "esp_sleep.h"

#include "esp_eddystone_protocol.h"
#include "esp_eddystone_api.h"

static const char* DEMO_TAG = "EDDYSTONE_DEMO";

/* declare static functions */
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t* param);
static void esp_eddystone_show_inform(const esp_eddystone_result_t* res);

static esp_ble_scan_params_t ble_scan_params = {
    .scan_type              = BLE_SCAN_TYPE_ACTIVE,
    .own_addr_type          = BLE_ADDR_TYPE_PUBLIC,
    .scan_filter_policy     = BLE_SCAN_FILTER_ALLOW_ALL,
    .scan_interval          = 0x50,
    .scan_window            = 0x30,
    .scan_duplicate         = BLE_SCAN_DUPLICATE_DISABLE
};

void esp_eddystone_appRegister(void)
{
    esp_err_t status;
    
    ESP_LOGI(DEMO_TAG,"Register callback");

    /*<! register the scan callback function to the gap module */
    if((status = esp_ble_gap_register_callback(esp_gap_cb)) != ESP_OK) {
        ESP_LOGE(DEMO_TAG,"gap register error: %s", esp_err_to_name(status));
        return;
    }
}

void esp_eddystone_init(void)
{
    esp_bluedroid_init();
    esp_bluedroid_enable();
    esp_eddystone_appRegister();
}

static void esp_eddystone_show_inform(const esp_eddystone_result_t* res)
{
    switch(res->common.frame_type)
    {
        case EDDYSTONE_FRAME_TYPE_UID: {
            ESP_LOGI(DEMO_TAG, "Eddystone UID inform:");
            ESP_LOGI(DEMO_TAG, "Measured power(RSSI at 0m distance):%d dbm", res->inform.uid.ranging_data);
            ESP_LOGI(DEMO_TAG, "EDDYSTONE_DEMO: Namespace ID:0x");
            esp_log_buffer_hex(DEMO_TAG, res->inform.uid.namespace_id, 10);
            ESP_LOGI(DEMO_TAG, "EDDYSTONE_DEMO: Instance ID:0x");
            esp_log_buffer_hex(DEMO_TAG, res->inform.uid.instance_id, 6);
            break;
        }
        case EDDYSTONE_FRAME_TYPE_URL: {
            ESP_LOGI(DEMO_TAG, "Eddystone URL inform:");
            ESP_LOGI(DEMO_TAG, "Measured power(RSSI at 0m distance):%d dbm", res->inform.url.tx_power);
            ESP_LOGI(DEMO_TAG, "URL: %s", res->inform.url.url);
            break;
        }
        case EDDYSTONE_FRAME_TYPE_TLM: {
            ESP_LOGI(DEMO_TAG, "Eddystone TLM inform:");
            ESP_LOGI(DEMO_TAG, "version: %d", res->inform.tlm.version);
            ESP_LOGI(DEMO_TAG, "battery voltage: %d mV", res->inform.tlm.battery_voltage);
            ESP_LOGI(DEMO_TAG, "beacon temperature in degrees Celsius: %6.1f", res->inform.tlm.temperature);
            ESP_LOGI(DEMO_TAG, "adv pdu count since power-up: %d", res->inform.tlm.adv_count);
            ESP_LOGI(DEMO_TAG, "time since power-up: %d s", res->inform.tlm.time);
            break;
        }
        default:
            break;
    }
}

static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t* param)
{
    esp_err_t err;

    switch(event)
    {
        case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {
            uint32_t duration = 20;
            esp_ble_gap_start_scanning(duration);
            break;
        }
        case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT: {
            if((err = param->scan_start_cmpl.status) != ESP_BT_STATUS_SUCCESS) {
                ESP_LOGE(DEMO_TAG,"Scan start failed: %s", esp_err_to_name(err));
            }
            else {
                ESP_LOGI(DEMO_TAG,"Start scanning...");
            }
            break;
        }
        case ESP_GAP_BLE_SCAN_RESULT_EVT: {
            esp_ble_gap_cb_param_t* scan_result = (esp_ble_gap_cb_param_t*)param;
            switch(scan_result->scan_rst.search_evt)
            {
                case ESP_GAP_SEARCH_INQ_RES_EVT: {
                    esp_eddystone_result_t eddystone_res;
                    memset(&eddystone_res, 0, sizeof(eddystone_res));
                    esp_err_t ret = esp_eddystone_decode(scan_result->scan_rst.ble_adv, scan_result->scan_rst.adv_data_len, &eddystone_res);
                    if (ret) {
                        // error:The received data is not an eddystone frame packet or a correct eddystone frame packet.
                        // just return
                        return;
                    } else {   
                        // The received adv data is a correct eddystone frame packet.
                        // Here, we get the eddystone infomation in eddystone_res, we can use the data in res to do other things.
                        // For example, just print them:
                        ESP_LOGI(DEMO_TAG, "--------Eddystone Found----------");
                        esp_log_buffer_hex("EDDYSTONE_DEMO: Device address:", scan_result->scan_rst.bda, ESP_BD_ADDR_LEN);
                        ESP_LOGI(DEMO_TAG, "RSSI of packet:%d dbm", scan_result->scan_rst.rssi);
                        esp_eddystone_show_inform(&eddystone_res);
                    }
                    break;
                }
                case ESP_GAP_SEARCH_INQ_CMPL_EVT:
                {
                   /*Should arrive here after 20 seconds*/
                    ESP_LOGI(DEMO_TAG, "Scan is complete!");
                    /*Only disabling the hardware but not deinitialising the bluedroid stack*/
                    esp_bluedroid_disable();                  
                    esp_bt_controller_disable();
                    /*Now we enable it again*/
                    esp_bt_controller_enable(ESP_BT_MODE_BLE);
                    esp_ble_gap_set_scan_params(&ble_scan_params);
                }
                default:
                    break;
            }
            break;
        }
        case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:{
            if((err = param->scan_stop_cmpl.status) != ESP_BT_STATUS_SUCCESS) {
                ESP_LOGE(DEMO_TAG,"Scan stop failed: %s", esp_err_to_name(err));
            }
            else {
                ESP_LOGI(DEMO_TAG,"Stop scan successfully");
            }
            break;
        }
        default:
            break;
    }
}

void app_main()
{
    ESP_ERROR_CHECK(nvs_flash_init());
    ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT));
    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    esp_bt_controller_init(&bt_cfg);
    esp_bt_controller_enable(ESP_BT_MODE_BLE);
 
    esp_eddystone_init();

    /*<! set scan parameters */
    esp_ble_gap_set_scan_params(&ble_scan_params);
}