#include <Arduino.h>
#include <Wire.h>
#include "config.h"
#include "display_ui.h"
#include "sensors.h"
#include "rtc_time.h"
#include "forecast.h"
#include "history.h"

static void i2cScan() {
  Serial.println(F("I2C scan:"));
  byte found = 0;
  for (byte addr = 1; addr < 127; addr++) {
    Wire.beginTransmission(addr);
    if (Wire.endTransmission() == 0) {
      Serial.printf("  device at 0x%02X\n", addr);
      found++;
    }
  }
  Serial.printf("  %d device(s) found\n", found);
}

void setup() {
  Serial.begin(115200);
  delay(200);
  Serial.println(F("\n=== Weather Predictor booting ==="));
  Wire.begin(I2C_SDA, I2C_SCL);   // MUST come before any I2C driver begin()
  i2cScan();

  displayBegin();
  displaySplash("Weather", "Predictor v0.1");

  if (!sensorsBegin()) Serial.println(F("BMP180 not found!"));
  if (!rtcBegin())     Serial.println(F("DS3231 not found!"));
  if (rtcLostPower()) {
    Serial.println(F("RTC lost power -> setting to build time"));
    rtcSet(RtcTime{2026, 7, 17, 12, 0, 0});  // temporary; NTP will correct later
  }

  // --- forecast self-test (remove after Task 8) ---
  struct { float p; Trend tr; } cases[] = {
    {1030, TREND_STEADY}, {1030, TREND_RISING}, {1030, TREND_FALLING},
    {1000, TREND_STEADY}, {1000, TREND_FALLING}, {970, TREND_FALLING},
  };
  for (auto& c : cases) {
    Forecast f = computeForecast(c.p, c.tr, 7);
    Serial.printf("p=%.0f trend=%d -> %c [%s] (%s)\n",
                  c.p, c.tr, f.letter, f.text, categoryShort(f.category));
  }

  // --- history self-test (remove after Task 8) ---
  historyBegin();
  uint32_t base = 1000000000UL;
  for (int i = 0; i < 40; i++)                 // 40 samples @ 5 min = 3h20m, pressure falling
    historyAdd(base + (uint32_t)i * 300, 1015.0f - i * 0.2f, 20.0f);
  float d;
  if (historyTrendDelta(d))
    Serial.printf("history count=%d  3h delta=%.2f hPa  trend=%d\n",
                  historyCount(), d, classifyTrend(d));
  else
    Serial.println(F("history: not enough data for trend"));
}

void loop() {
  RtcTime t = rtcNow();
  float abs_ = readAbsPressureHpa();
  Serial.printf("%04u-%02u-%02u %02u:%02u:%02u  abs=%.1f msl=%.1f t=%.1f\n",
                t.year, t.month, t.day, t.hour, t.minute, t.second,
                abs_, toSeaLevelHpa(abs_, DEFAULT_ALTITUDE_M), readTemperatureC());
  delay(2000);
}