/* Mesh Internal Communication Example

   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 "esp_err.h"
#include "esp_event.h"
#include "esp_log.h"
#include "esp_mac.h"
#include "esp_mesh.h"
#include "esp_wifi.h"
#include "esp_wifi_types_generic.h"
#include "freertos/semphr.h"
#include "mesh_netif.h"
#include "nvs_flash.h"
#include <inttypes.h>
#include <string.h>

/*******************************************************
 *                Macros
 *******************************************************/

// commands for internal mesh communication:
// <CMD> <PAYLOAD>, where CMD is one character, payload is variable dep. on
// command
#define CMD_KEYPRESSED 0x55
// CMD_KEYPRESSED: payload is always 6 bytes identifying address of node sending
// keypress event
#define CMD_ROUTE_TABLE 0x56
// CMD_KEYPRESSED: payload is a multiple of 6 listing addresses in a routing
// table
/*******************************************************
 *                Constants
 *******************************************************/
static const char *MESH_TAG = "mesh_main";
static const uint8_t MESH_ID[6] = {0x77, 0x77, 0x77, 0x77, 0x77, 0x76};

/*******************************************************
 *                Variable Definitions
 *******************************************************/
static mesh_addr_t mesh_parent_addr;
static int mesh_layer = -1;
static esp_ip4_addr_t s_current_ip;
static mesh_addr_t s_route_table[CONFIG_MESH_ROUTE_TABLE_SIZE];
static int s_route_table_size = 0;
static SemaphoreHandle_t s_route_table_lock = NULL;
// static uint8_t s_mesh_tx_payload[CONFIG_MESH_ROUTE_TABLE_SIZE * 6 + 1];

/*******************************************************
 *                Function Definitions
 *******************************************************/

void static recv_cb(mesh_addr_t *from, mesh_data_t *data) {
  if (data->data[0] == CMD_ROUTE_TABLE) {
    int size = data->size - 1;
    if (s_route_table_lock == NULL || size % 6 != 0) {
      ESP_LOGE(MESH_TAG, "Error in receiving raw mesh data: Unexpected size");
      return;
    }
    xSemaphoreTake(s_route_table_lock, portMAX_DELAY);
    s_route_table_size = size / 6;
    for (int i = 0; i < s_route_table_size; ++i) {
      ESP_LOGI(MESH_TAG, "Received Routing table [%d] " MACSTR, i,
               MAC2STR(data->data + 6 * i + 1));
    }
    memcpy(&s_route_table, data->data + 1, size);
    xSemaphoreGive(s_route_table_lock);
  } else if (data->data[0] == CMD_KEYPRESSED) {
    if (data->size != 7) {
      ESP_LOGE(MESH_TAG, "Error in receiving raw mesh data: Unexpected size");
      return;
    }
    ESP_LOGW(MESH_TAG, "Keypressed detected on node: " MACSTR,
             MAC2STR(data->data + 1));
  } else {
    ESP_LOGE(MESH_TAG, "Error in receiving raw mesh data: Unknown command");
  }
}

void mesh_event_handler(void *arg, esp_event_base_t event_base,
                        int32_t event_id, void *event_data) {
  mesh_addr_t id = {
      0,
  };
  static uint8_t last_layer = 0;

  switch (event_id) {
  case MESH_EVENT_STARTED: {
    esp_mesh_get_id(&id);
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_MESH_STARTED>ID:" MACSTR "",
             MAC2STR(id.addr));
    mesh_layer = esp_mesh_get_layer();
  } break;
  case MESH_EVENT_STOPPED: {
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_STOPPED>");
    mesh_layer = esp_mesh_get_layer();
  } break;
  case MESH_EVENT_CHILD_CONNECTED: {
    mesh_event_child_connected_t *child_connected =
        (mesh_event_child_connected_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_CHILD_CONNECTED>aid:%d, " MACSTR "",
             child_connected->aid, MAC2STR(child_connected->mac));
  } break;
  case MESH_EVENT_CHILD_DISCONNECTED: {
    mesh_event_child_disconnected_t *child_disconnected =
        (mesh_event_child_disconnected_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_CHILD_DISCONNECTED>aid:%d, " MACSTR "",
             child_disconnected->aid, MAC2STR(child_disconnected->mac));
  } break;
  case MESH_EVENT_ROUTING_TABLE_ADD: {
    mesh_event_routing_table_change_t *routing_table =
        (mesh_event_routing_table_change_t *)event_data;
    ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_ADD>add %d, new:%d",
             routing_table->rt_size_change, routing_table->rt_size_new);
  } break;
  case MESH_EVENT_ROUTING_TABLE_REMOVE: {
    mesh_event_routing_table_change_t *routing_table =
        (mesh_event_routing_table_change_t *)event_data;
    ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_REMOVE>remove %d, new:%d",
             routing_table->rt_size_change, routing_table->rt_size_new);
  } break;
  case MESH_EVENT_NO_PARENT_FOUND: {
    mesh_event_no_parent_found_t *no_parent =
        (mesh_event_no_parent_found_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_NO_PARENT_FOUND>scan times:%d",
             no_parent->scan_times);
  }
  /* TODO handler for the failure */
  break;
  case MESH_EVENT_PARENT_CONNECTED: {
    mesh_event_connected_t *connected = (mesh_event_connected_t *)event_data;
    esp_mesh_get_id(&id);
    mesh_layer = connected->self_layer;
    memcpy(&mesh_parent_addr.addr, connected->connected.bssid, 6);
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_PARENT_CONNECTED>layer:%d-->%d, parent:" MACSTR
             "%s, ID:" MACSTR "",
             last_layer, mesh_layer, MAC2STR(mesh_parent_addr.addr),
             esp_mesh_is_root()  ? "<ROOT>"
             : (mesh_layer == 2) ? "<layer2>"
                                 : "",
             MAC2STR(id.addr));
    last_layer = mesh_layer;
    mesh_netifs_start(esp_mesh_is_root());
  } break;
  case MESH_EVENT_PARENT_DISCONNECTED: {
    mesh_event_disconnected_t *disconnected =
        (mesh_event_disconnected_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_PARENT_DISCONNECTED>reason:%d",
             disconnected->reason);
    mesh_layer = esp_mesh_get_layer();
    mesh_netifs_stop();
  } break;
  case MESH_EVENT_LAYER_CHANGE: {
    mesh_event_layer_change_t *layer_change =
        (mesh_event_layer_change_t *)event_data;
    mesh_layer = layer_change->new_layer;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_LAYER_CHANGE>layer:%d-->%d%s", last_layer,
             mesh_layer,
             esp_mesh_is_root()  ? "<ROOT>"
             : (mesh_layer == 2) ? "<layer2>"
                                 : "");
    last_layer = mesh_layer;
  } break;
  case MESH_EVENT_ROOT_ADDRESS: {
    mesh_event_root_address_t *root_addr =
        (mesh_event_root_address_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_ROOT_ADDRESS>root address:" MACSTR "",
             MAC2STR(root_addr->addr));
  } break;
  case MESH_EVENT_VOTE_STARTED: {
    mesh_event_vote_started_t *vote_started =
        (mesh_event_vote_started_t *)event_data;
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_VOTE_STARTED>attempts:%d, reason:%d, rc_addr:" MACSTR
             "",
             vote_started->attempts, vote_started->reason,
             MAC2STR(vote_started->rc_addr.addr));
  } break;
  case MESH_EVENT_VOTE_STOPPED: {
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_VOTE_STOPPED>");
    break;
  }
  case MESH_EVENT_ROOT_SWITCH_REQ: {
    mesh_event_root_switch_req_t *switch_req =
        (mesh_event_root_switch_req_t *)event_data;
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_ROOT_SWITCH_REQ>reason:%d, rc_addr:" MACSTR "",
             switch_req->reason, MAC2STR(switch_req->rc_addr.addr));
  } break;
  case MESH_EVENT_ROOT_SWITCH_ACK: {
    /* new root */
    mesh_layer = esp_mesh_get_layer();
    esp_mesh_get_parent_bssid(&mesh_parent_addr);
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_ROOT_SWITCH_ACK>layer:%d, parent:" MACSTR "",
             mesh_layer, MAC2STR(mesh_parent_addr.addr));
  } break;
  case MESH_EVENT_TODS_STATE: {
    mesh_event_toDS_state_t *toDs_state = (mesh_event_toDS_state_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_TODS_REACHABLE>state:%d", *toDs_state);
  } break;
  case MESH_EVENT_ROOT_FIXED: {
    mesh_event_root_fixed_t *root_fixed = (mesh_event_root_fixed_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_ROOT_FIXED>%s",
             root_fixed->is_fixed ? "fixed" : "not fixed");
  } break;
  case MESH_EVENT_ROOT_ASKED_YIELD: {
    mesh_event_root_conflict_t *root_conflict =
        (mesh_event_root_conflict_t *)event_data;
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_ROOT_ASKED_YIELD>" MACSTR ", rssi:%d, capacity:%d",
             MAC2STR(root_conflict->addr), root_conflict->rssi,
             root_conflict->capacity);
  } break;
  case MESH_EVENT_CHANNEL_SWITCH: {
    mesh_event_channel_switch_t *channel_switch =
        (mesh_event_channel_switch_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_CHANNEL_SWITCH>new channel:%d",
             channel_switch->channel);
  } break;
  case MESH_EVENT_SCAN_DONE: {
    mesh_event_scan_done_t *scan_done = (mesh_event_scan_done_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_SCAN_DONE>number:%d", scan_done->number);
  } break;
  case MESH_EVENT_NETWORK_STATE: {
    mesh_event_network_state_t *network_state =
        (mesh_event_network_state_t *)event_data;
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_NETWORK_STATE>is_rootless:%d",
             network_state->is_rootless);
  } break;
  case MESH_EVENT_STOP_RECONNECTION: {
    ESP_LOGI(MESH_TAG, "<MESH_EVENT_STOP_RECONNECTION>");
  } break;
  case MESH_EVENT_FIND_NETWORK: {
    mesh_event_find_network_t *find_network =
        (mesh_event_find_network_t *)event_data;
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_FIND_NETWORK>new channel:%d, router BSSID:" MACSTR "",
             find_network->channel, MAC2STR(find_network->router_bssid));
  } break;
  case MESH_EVENT_ROUTER_SWITCH: {
    mesh_event_router_switch_t *router_switch =
        (mesh_event_router_switch_t *)event_data;
    ESP_LOGI(MESH_TAG,
             "<MESH_EVENT_ROUTER_SWITCH>new router:%s, channel:%d, " MACSTR "",
             router_switch->ssid, router_switch->channel,
             MAC2STR(router_switch->bssid));
  } break;
  default:
    ESP_LOGI(MESH_TAG, "unknown id:%" PRId32 "", event_id);
    break;
  }
}

void ip_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id,
                      void *event_data) {
  ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
  ESP_LOGI(MESH_TAG, "<IP_EVENT_STA_GOT_IP>IP:" IPSTR,
           IP2STR(&event->ip_info.ip));
  s_current_ip.addr = event->ip_info.ip.addr;
#if !CONFIG_MESH_USE_GLOBAL_DNS_IP
  esp_netif_t *netif = event->esp_netif;
  esp_netif_dns_info_t dns;
  ESP_ERROR_CHECK(esp_netif_get_dns_info(netif, ESP_NETIF_DNS_MAIN, &dns));
  mesh_netif_start_root_ap(esp_mesh_is_root(), dns.ip.u_addr.ip4.addr);
#endif
  // esp_mesh_comm_mqtt_task_start();
}

void netif_start(void) {
  ESP_ERROR_CHECK(nvs_flash_init());
  /*  tcpip initialization */
  ESP_ERROR_CHECK(esp_netif_init());
  /*  event initialization */
  ESP_ERROR_CHECK(esp_event_loop_create_default());
  /*  crete network interfaces for mesh (only station instance saved for further
   * manipulation, soft AP instance ignored */
  ESP_ERROR_CHECK(mesh_netifs_init(recv_cb));

  /*  wifi initialization */
  wifi_init_config_t config = WIFI_INIT_CONFIG_DEFAULT();
  ESP_ERROR_CHECK(esp_wifi_init(&config));
  ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP,
                                             &ip_event_handler, NULL));
  ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_FLASH));
  ESP_ERROR_CHECK(esp_wifi_set_ps(WIFI_PS_NONE));
  ESP_ERROR_CHECK(esp_wifi_start());
  /*  mesh initialization */
  ESP_ERROR_CHECK(esp_mesh_init());
  ESP_ERROR_CHECK(esp_event_handler_register(MESH_EVENT, ESP_EVENT_ANY_ID,
                                             &mesh_event_handler, NULL));
  ESP_ERROR_CHECK(esp_mesh_set_max_layer(CONFIG_MESH_MAX_LAYER));
  ESP_ERROR_CHECK(esp_mesh_set_vote_percentage(1));
  ESP_ERROR_CHECK(esp_mesh_set_ap_assoc_expire(10));
  /* set blocking time of esp_mesh_send() to 30s, to prevent the esp_mesh_send()
   * from permanently for some reason */
  ESP_ERROR_CHECK(esp_mesh_send_block_time(30000));
  mesh_cfg_t cfg = MESH_INIT_CONFIG_DEFAULT();
#if !MESH_IE_ENCRYPTED
  cfg.crypto_funcs = NULL;
#endif
  /* mesh ID */
  memcpy((uint8_t *)&cfg.mesh_id, MESH_ID, 6);
  /* router */
  cfg.channel = CONFIG_MESH_CHANNEL;
  cfg.router.ssid_len = strlen(CONFIG_MESH_ROUTER_SSID);
  memcpy((uint8_t *)&cfg.router.ssid, CONFIG_MESH_ROUTER_SSID,
         cfg.router.ssid_len);
  memcpy((uint8_t *)&cfg.router.password, CONFIG_MESH_ROUTER_PASSWD,
         strlen(CONFIG_MESH_ROUTER_PASSWD));
  /* mesh softAP */
  ESP_ERROR_CHECK(esp_mesh_set_ap_authmode(CONFIG_MESH_AP_AUTHMODE));
  cfg.mesh_ap.max_connection = CONFIG_MESH_AP_CONNECTIONS;
  cfg.mesh_ap.nonmesh_max_connection = CONFIG_MESH_NON_MESH_AP_CONNECTIONS;
  memcpy((uint8_t *)&cfg.mesh_ap.password, CONFIG_MESH_AP_PASSWD,
         strlen(CONFIG_MESH_AP_PASSWD));
  ESP_ERROR_CHECK(esp_mesh_set_config(&cfg));
  // fixed root node
  // wifi_config_t wifi_cfg;

  // ESP_ERROR_CHECK(esp_wifi_get_config(WIFI_IF_AP, &wifi_cfg));
  // ESP_ERROR_CHECK(
  //     esp_mesh_set_parent(&wifi_cfg, &cfg.mesh_id, MESH_ROOT,
  //     MESH_ROOT_LAYER));
  //
  /* mesh start */
  ESP_ERROR_CHECK(esp_mesh_start());
  ESP_LOGI(MESH_TAG, "mesh starts successfully, heap:%" PRId32 ", %s",
           esp_get_free_heap_size(),
           esp_mesh_is_root_fixed() ? "root fixed" : "root not fixed");
}
