#include <ArduinoJson.h>
#include <pgmspace.h>

// Inside the brackets, 200 is the capacity of the memory pool in bytes.
// Don't forget to change this value to match your JSON document.
// Use arduinojson.org/v6/assistant to compute the capacity.
StaticJsonDocument<400> doc;

void base_str1(){
  Serial.println("------------------------------ string.toCharArray");
  String stringOne = "ABcd567890-string";
  char Buf[50];
  Serial.println(Buf[0]);//空

  stringOne.toCharArray(Buf,5);
  Serial.println(Buf);
  Serial.println(Buf[0]);
  Serial.println(Buf[1]);
  Serial.println(Buf[6]);//空
  Serial.println(Buf[30]);//空
  Serial.println(Buf[40]);//空
  Serial.println("------------------------------");  
}

void base_JSON(){
  Serial.println("------------------------------ JSON");
  
  /*
  char j1[] ="{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
  Serial.println("----------------j1");
  Serial.println(strlen(j1));
  Serial.println(j1);
  
  //char j2[10] 會錯
  char j2[100] ="{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
  Serial.println("----------------j2");
  Serial.println(strlen(j2));
  Serial.println(j2);

  //char j1[] 
  //char j2[100]  最後長度都一樣
  */

  //JSON
  //https://arduinojson.org/v6/example/parser/

  //char json[]="{\"channel\":{\"id\":2038509,\"name\":\"Home-FishLigh\",\"description\":\"Home-FishLigh\",\"latitude\":\"25.001823\",\"longitude\":\"121.467812\",\"field1\":\"type\",\"created_at\":\"2023-02-20T02:31:01Z\",\"updated_at\":\"2023-02-20T05:37:33Z\",\"last_entry_id\":4},\"feeds\":[{\"created_at\":\"2023-02-20T13:13:04Z\",\"entry_id\":4,\"field1\":\"1\"}]}";
  char json[] ="{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
  Serial.println(json);
  // Deserialize the JSON document
  DeserializationError error = deserializeJson(doc, json);  
  if (error) {
    Serial.print(F("deserializeJson-> failed: "));
    Serial.println(error.f_str());    
  }
  else{
    Serial.println("deserializeJson-> OK");

    /*
    {
      "data": [
        48.75608,
        2.302038
      ],
      "sensor": "gps",
      "time": 1351824120
    }
    */
    
    // Fetch values - Most of the time, you can rely on the implicit casts.
    // In other case, you can do doc["time"].as<long>();    
    const char* sensor = doc["sensor"];
    long time = doc["time"];
    double latitude = doc["data"][0];
    double longitude = doc["data"][1];

    // Print values.
    Serial.print("sensor=");
    Serial.println(sensor);

    Serial.print("time=");
    Serial.println(time);
    
    Serial.print("data(1)=");
    Serial.println(latitude, 6);
    Serial.print("data(2)=");
    Serial.println(longitude, 6);  
  } 
  

}


//https://arduinojson.org/v6/how-to/reduce-memory-usage/
void base_JSON_2(){
  Serial.println("------------------------------ JSON(2)");
  
  //JSON ref->https://arduinojson.org/v6/example/parser/
  char json[]="{\"channel\":{\"id\":2038509,\"name\":\"Home-FishLigh\",\"description\":\"Home-FishLigh\",\"latitude\":\"25.001823\",\"longitude\":\"121.467812\",\"field1\":\"type\",\"created_at\":\"2023-02-20T02:31:01Z\",\"updated_at\":\"2023-02-20T05:37:33Z\",\"last_entry_id\":4},\"feeds\":[{\"created_at\":\"2023-02-20T13:13:04Z\",\"entry_id\":4,\"field1\":\"1\"}]}";
  //char json[] ="{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
  Serial.println(json);
  
  // Deserialize the JSON document
  DeserializationError error = deserializeJson(doc, json);  
  if (error) {
    Serial.print(F("deserializeJson-> failed: "));
    Serial.println(error.f_str());    
  }
  else{
    Serial.println("deserializeJson-> OK");
    
    // Fetch values - Most of the time, you can rely on the implicit casts.
    // In other case, you can do doc["time"].as<long>();    
    //double latitude = doc["data"][0];
    const char* created_at = doc["feeds"][0]["created_at"];
    int entry_id= doc["feeds"][0]["entry_id"];
    String field1= doc["feeds"][0]["field1"];
    //"created_at": "2023-02-20T13:13:04Z",
    // "entry_id": 4,
    //"field1": "1"

    // Print values.
    Serial.print("created_at=");Serial.println(created_at);
    Serial.print("entry_id=");Serial.println(entry_id);
    Serial.print("field1=");Serial.println(field1);

  }

}


void setup() {
  Serial.begin(115200);
  //base_str1();
  //base_JSON();
  base_JSON_2();
  for (;;); //停止
}

void loop() {
}