/*
  ESP32 Power Meter

  https://wokwi.com/projects/342032431249883731

  Copyright (C) 2022, Uri Shaked
*/

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

#define BTN_PIN 5
#define TFT_DC 2
#define TFT_CS 15
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

const String url = "https://9f5e-185-236-109-3.ngrok-free.app/status";

float *getPowerMeters() {
  HTTPClient http;
  http.useHTTP10(true);
  http.begin(url);
  http.GET();
  String result = http.getString();

  DynamicJsonDocument doc(2048);
  DeserializationError error = deserializeJson(doc, result);

  // Test if parsing succeeds.
  if (error) {
    Serial.print("deserializeJson() failed: ");
    Serial.println(error.c_str());
    return nullptr;
  }

  JsonArray meters = doc["emeters"].as<JsonArray>();
  http.end();
  float *values = new float[3];
  
  values[0] = meters[0].as<JsonObject>()["power"].as<JsonVariant>().as<float>();
  values[1] = meters[1].as<JsonObject>()["power"].as<JsonVariant>().as<float>();
  values[2] = meters[2].as<JsonObject>()["power"].as<JsonVariant>().as<float>();

  return values;
}

void displayMeters() {
  float *meters = getPowerMeters();
//  tft.fillScreen(ILI9341_BLACK);
  tft.setCursor(0, 0);

  tft.setTextColor(ILI9341_BLACK, ILI9341_BLACK);
  tft.println("            ");
  tft.println("            ");
  tft.println("            ");
  tft.setCursor(0, 0);

  tft.setTextColor(ILI9341_GREEN, ILI9341_BLACK);
  tft.println("Phase 1:" + String(meters[0]));
  tft.println("Phase 2:" + String(meters[1]));
  tft.println("Phase 3:" + String(meters[2]));
}

void setup() {
  pinMode(BTN_PIN, INPUT_PULLUP);

  WiFi.begin(ssid, password, 6);

  tft.begin();
  tft.setRotation(1);

  tft.setTextSize(3);

  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
  }
  displayMeters();
}

void loop() {
  displayMeters();

  delay(1000);
}