/*
   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_system.h"
#include "esp_log.h"
#include "esp_bt.h"
#include "bt_app_core.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include "esp_gap_bt_api.h"
#include "esp_hf_ag_api.h"
#include "bt_app_hf.h"
#include "gpio_pcm_config.h"
#include "esp_console.h"
#include "app_hf_msg_set.h"

#define BT_HF_AG_TAG            "HF_AG_DEMO_MAIN"

/* event for handler "hf_ag_hdl_stack_up */
enum {
    BT_APP_EVT_STACK_UP = 0,
};

/* handler for bluetooth stack enabled events */
static void bt_hf_hdl_stack_evt(uint16_t event, void *p_param)
{
    ESP_LOGD(BT_HF_TAG, "%s evt %d", __func__, event);
    switch (event)
    {
        case BT_APP_EVT_STACK_UP:
        {
            /* set up device name */
            char *dev_name = "ESP_HFP_AG";
            esp_bt_dev_set_device_name(dev_name);

            esp_bt_hf_register_callback(bt_app_hf_cb);

            // init and register for HFP_AG functions
            esp_bt_hf_init(hf_peer_addr);

            /*
            * Set default parameters for Legacy Pairing
            * Use variable pin, input pin code when pairing
            */
            esp_bt_pin_type_t pin_type = ESP_BT_PIN_TYPE_VARIABLE;
            esp_bt_pin_code_t pin_code;
            pin_code[0] = '0';
            pin_code[1] = '0';
            pin_code[2] = '0';
            pin_code[3] = '0';
            esp_bt_gap_set_pin(pin_type, 4, pin_code);

            /* set discoverable and connectable mode, wait to be connected */
            esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
            break;
        }
        default:
            ESP_LOGE(BT_HF_TAG, "%s unhandled evt %d", __func__, event);
            break;
    }
}

void app_main(void)
{
    /* Initialize NVS — it is used to store PHY calibration data */
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);
    ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_BLE));

    esp_err_t err;
    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    if ((err = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
        ESP_LOGE(BT_HF_TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    if ((err = esp_bt_controller_enable(ESP_BT_MODE_CLASSIC_BT)) != ESP_OK) {
        ESP_LOGE(BT_HF_TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    if ((err = esp_bluedroid_init()) != ESP_OK) {
        ESP_LOGE(BT_HF_TAG, "%s initialize bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }
    if ((err = esp_bluedroid_enable()) != ESP_OK) {
        ESP_LOGE(BT_HF_TAG, "%s enable bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
        return;
    }

    /* create application task */
    bt_app_task_start_up();

    /* Bluetooth device name, connection mode and profile set up */
    bt_app_work_dispatch(bt_hf_hdl_stack_evt, BT_APP_EVT_STACK_UP, NULL, 0, NULL);

#if CONFIG_BT_HFP_AUDIO_DATA_PATH_PCM
    /* configure the PCM interface and PINs used */
    app_gpio_pcm_io_cfg();
#endif

    /* configure externel chip for acoustic echo cancellation */
#if ACOUSTIC_ECHO_CANCELLATION_ENABLE
    app_gpio_aec_io_cfg();
#endif /* ACOUSTIC_ECHO_CANCELLATION_ENABLE */

    esp_console_repl_t *repl = NULL;
    esp_console_repl_config_t repl_config = ESP_CONSOLE_REPL_CONFIG_DEFAULT();
    esp_console_dev_uart_config_t uart_config = ESP_CONSOLE_DEV_UART_CONFIG_DEFAULT();
    repl_config.prompt = "hfp_ag>";

    // init console REPL environment
    ESP_ERROR_CHECK(esp_console_new_repl_uart(&uart_config, &repl_config, &repl));

    /* Register commands */
    register_hfp_ag();
    printf("\n ==================================================\n");
    printf(" |       Steps to test hfp_ag                     |\n");
    printf(" |                                                |\n");
    printf(" |  1. Print 'help' to gain overview of commands  |\n");
    printf(" |  2. Setup a service level connection           |\n");
    printf(" |  3. Run hfp_ag to test                         |\n");
    printf(" |                                                |\n");
    printf(" =================================================\n\n");

    // start console REPL
    ESP_ERROR_CHECK(esp_console_start_repl(repl));
}