#include "button.h"
#include "pins.h"

#include <Arduino.h>

// 轻触开关：一端 → GPIO22，另一端 → GND（内部上拉，按下=LOW）

static uint32_t g_count = 0;
static bool g_stable_down = false;
static int g_stable_raw = HIGH;
static uint32_t g_change_ms = 0;
static int g_pending_raw = HIGH;
static bool g_pending = false;
static constexpr uint32_t DEBOUNCE_MS = 25;

void button_init() {
  pinMode(BTN_PIN, INPUT_PULLUP);
  delay(5);
  g_count = 0;
  g_stable_raw = digitalRead(BTN_PIN);
  g_stable_down = (g_stable_raw == LOW);
  g_pending = false;
  g_pending_raw = g_stable_raw;
  g_change_ms = millis();
  Serial.printf("Button tactile GPIO%d pullup, idle=%s (wire other side to GND)\n",
                BTN_PIN, g_stable_raw == HIGH ? "HIGH" : "LOW");
}

bool button_poll_press() {
  const int raw = digitalRead(BTN_PIN);
  const uint32_t now = millis();

  if (raw != g_stable_raw) {
    if (!g_pending || raw != g_pending_raw) {
      g_pending = true;
      g_pending_raw = raw;
      g_change_ms = now;
    } else if ((now - g_change_ms) >= DEBOUNCE_MS) {
      g_stable_raw = g_pending_raw;
      g_pending = false;
      const bool down = (g_stable_raw == LOW);
      if (down && !g_stable_down) {
        g_stable_down = true;
        g_count++;
        Serial.printf("Button press count=%lu raw=%d\n", (unsigned long)g_count,
                      g_stable_raw);
        return true;
      }
      g_stable_down = down;
    }
  } else {
    g_pending = false;
  }

  return false;
}

uint32_t button_count() { return g_count; }

void button_reset_count() {
  g_count = 0;
  Serial.println("Button count reset");
}

bool button_is_down() { return g_stable_down; }

int button_raw_level() { return digitalRead(BTN_PIN); }