# ==========================================
# Pico_DataLogger -> microSD (SPI1)
# Hardware:
#   SPI1: SCK=14, MOSI=15, MISO=12, CS=13
#   Buzzer: GP22 (opcional)
# ==========================================

import time
import uos
from machine import Pin, SPI, PWM

# -----------------------------
#  Memoria SD (SPI)
# -----------------------------
SPI_ID   = 1
PIN_SCK  = 14
PIN_MOSI = 15
PIN_MISO = 12
PIN_SD_CS = 13

# -----------------------------
#  Buzzer (opcional)
# -----------------------------
PIN_BUZZER = 22
buzzer = PWM(Pin(PIN_BUZZER))
buzzer.duty_u16(0)

def beep(ms=60, freq=2000):
    try:
        buzzer.freq(freq)
        buzzer.duty_u16(1200)
        time.sleep_ms(ms)
    finally:
        buzzer.duty_u16(0)

# -----------------------------
#  SD mount helpers
# -----------------------------
def ensure_dir(path):
    try:
        uos.stat(path)
    except OSError:
        uos.mkdir(path)

def mount_sd(mount_point="/sd"):
    """
    Monta la SD en /sd.
    Requiere sdcard.py (módulo sdcard).
    """
    import sdcard  # debe existir en el filesystem del Pico

    spi = SPI(
        SPI_ID,
        baudrate=10_000_000,
        polarity=0,
        phase=0,
        sck=Pin(PIN_SCK),
        mosi=Pin(PIN_MOSI),
        miso=Pin(PIN_MISO),
    )
    cs = Pin(PIN_SD_CS, Pin.OUT)

    sd = sdcard.SDCard(spi, cs)

    # crear punto de montaje si no existe
    try:
        uos.stat(mount_point)
    except OSError:
        uos.mkdir(mount_point)

    # montar
    uos.mount(sd, mount_point)
    return mount_point

# -----------------------------
#  Logger
# -----------------------------
def write_data_to_file(filepath):
    """Escribe la fecha y hora en un archivo en la SD."""
    try:
        t = time.localtime()
        dia, mes = t[2], t[1]
        hora, minuto, segundo = t[3], t[4], t[5]

        info_tiempo = "{:02}/{:02}  {:02}:{:02}:{:02}".format(
            dia, mes, hora, minuto, segundo
        )

        print("Escribiendo:", info_tiempo)

        with open(filepath, "a") as f:
            f.write(info_tiempo + "\n")

        beep(25, 2500)

    except OSError as e:
        print("Error SD/archivo:", e)
        beep(200, 600)

def main():
    led = Pin("LED", Pin.OUT)

    # Montar SD y preparar carpeta
    mp = mount_sd("/sd")
    data_dir = mp + "/logs"
    ensure_dir(data_dir)

    filepath = data_dir + "/datos1.dat"
    print("Guardando en:", filepath)
    print("Contenido /sd:", uos.listdir("/sd"))

    while True:
        write_data_to_file(filepath)

        # Heartbeat LED
        led.value(1)
        time.sleep(0.2)
        led.value(0)

        # Periodo de muestreo (1s)
        time.sleep(0.8)

if __name__ == "__main__":
    main()