#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Adafruit_NeoPixel.h>

#define LED_PIN 5
#define NUM_LEDS 256
#define MATRIX_WIDTH 16
#define MATRIX_HEIGHT 16

Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

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

// URL Google Apps Script (Web App)
const char* sheet_url = "https://script.google.com/macros/s/AKfycbyLyh9_DTxnWRDFIOeGp-r2Th-WYqthcq9LTId0zAZFrcDULayurR27Qak4bQcr3fum/exec";

// ตัวแปรจาก Google Sheet
int B2_pattern = 4;   
int B3_red     = 0;   
int B4_green   = 50;   
int B5_blue    = 255;

// ---------------- Map XY → index (Snake wiring) ----------------
int getIndex(int x, int y) {
  if (y % 2 == 0) {
    // แถวคู่: ซ้าย → ขวา
    return y * MATRIX_WIDTH + x;
  } else {
    // แถวคี่: ขวา → ซ้าย
    return y * MATRIX_WIDTH + (MATRIX_WIDTH - 1 - x);
  }
}

void setup() {
  Serial.begin(115200);
  strip.begin();
  strip.show();

  Serial.println("🔌 Connecting WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\n✅ WiFi connected!");
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    Serial.println("🌐 Sending GET request...");
    http.begin(sheet_url);
    int httpCode = http.GET();

    if (httpCode == 200) {
      String payload = http.getString();
      Serial.println("📥 Raw payload:");
      Serial.println(payload);

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

      if (!error) {
        Serial.println("✅ JSON parse success!");

        // อ่านค่าจาก JSON (ถ้าว่าง → ใช้ default)
        B2_pattern = doc["B2"].as<int>();
        B3_red     = doc["B3"].as<int>();
        B4_green   = doc["B4"].as<int>();
        B5_blue    = doc["B5"].as<int>();

        // ถ้าค่าเป็น 0 หรือไม่ได้กำหนด → ใส่ default
        if (B2_pattern < 1 || B2_pattern > 4) B2_pattern = 1;
        if (B3_red <= 0)   B3_red   = 255;
        if (B4_green < 0)  B4_green = 0;
        if (B5_blue < 0)   B5_blue  = 0;

        Serial.printf("🎨 Pattern=%d | R=%d, G=%d, B=%d\n", 
          B2_pattern, B3_red, B4_green, B5_blue);
      } else {
        Serial.print("❌ JSON parse failed: ");
        Serial.println(error.c_str());
      }
    } else {
      Serial.printf("❌ HTTP GET failed, code: %d\n", httpCode);
    }
    http.end();
  } else {
    Serial.println("⚠️ WiFi disconnected!");
  }

  // 🔄 เลือก Pattern
  switch(B2_pattern){
    case 1: moveUp(); break;
    case 2: moveDown(); break;
    case 3: moveLeft(); break;
    case 4: moveRight(); break;
    default: solidColor(); break;
  }

  delay(1000); // refresh ทุก 1 วิ
}

// ---------------- Animation ----------------
void moveUp(){
  for(int y=0; y<MATRIX_HEIGHT; y++){
    for(int x=0; x<MATRIX_WIDTH; x++){
      int i = getIndex(x,y);
      strip.setPixelColor(i, strip.Color(B3_red,B4_green,B5_blue));
    }
    strip.show();
    delay(100);
    strip.clear();
  }
}

void moveDown(){
  for(int y=MATRIX_HEIGHT-1; y>=0; y--){
    for(int x=0; x<MATRIX_WIDTH; x++){
      int i = getIndex(x,y);
      strip.setPixelColor(i, strip.Color(B3_red,B4_green,B5_blue));
    }
    strip.show();
    delay(100);
    strip.clear();
  }
}

void moveLeft(){
  for(int x=0; x<MATRIX_WIDTH; x++){
    for(int y=0; y<MATRIX_HEIGHT; y++){
      int i = getIndex(x,y);
      strip.setPixelColor(i, strip.Color(B3_red,B4_green,B5_blue));
    }
    strip.show();
    delay(100);
    strip.clear();
  }
}

void moveRight(){
  for(int x=MATRIX_WIDTH-1; x>=0; x--){
    for(int y=0; y<MATRIX_HEIGHT; y++){
      int i = getIndex(x,y);
      strip.setPixelColor(i, strip.Color(B3_red,B4_green,B5_blue));
    }
    strip.show();
    delay(100);
    strip.clear();
  }
}

void solidColor(){
  for(int i=0; i<strip.numPixels(); i++){
    strip.setPixelColor(i, strip.Color(B3_red,B4_green,B5_blue));
  }
  strip.show();
}