"""CircuitPython SD card utility using sdioio and storage.

Uses SDMMC 1-bit mode on Pins: sck=board.IO2, cmd=board.IO1, data0=board.IO3.
"""

import os
import board
import sdioio
import storage

class SDCardManager:
    def __init__(self, mount_point='/sd'):
        self.mount_point = mount_point
        self.sd = None
        self.mounted = False

    def mount(self):
        if self.mounted:
            print(f"SD card already mounted at {self.mount_point}")
            return True

        try:
            print("Initializing SDCard (SDMMC 1-bit mode: sck=2, cmd=1, d0=3)...")
            self.sd = sdioio.SDCard(clock=board.IO2, command=board.IO1, data=[board.IO3], frequency=20000000)
            vfs = storage.VfsFat(self.sd)
            print(f"Mounting SD card to {self.mount_point}...")
            storage.mount(vfs, self.mount_point)
            self.mounted = True
            print("SD card mounted successfully!")
            return True
        except Exception as e:
            print(f"Failed to mount SD card: {e}")
            self.sd = None
            self.mounted = False
            return False

    def unmount(self):
        if not self.mounted:
            return True

        try:
            print(f"Unmounting SD card from {self.mount_point}...")
            storage.umount(self.mount_point)
            if self.sd:
                try:
                    self.sd.deinit()
                except:
                    pass
            self.mounted = False
            self.sd = None
            print("SD card unmounted.")
            return True
        except Exception as e:
            print(f"Failed to unmount SD card: {e}")
            return False

    def is_mounted(self):
        return self.mounted

    def list_files(self):
        if not self.mounted:
            print("SD card is not mounted.")
            return None
        try:
            return os.listdir(self.mount_point)
        except Exception as e:
            print(f"Error listing SD card files: {e}")
            return None

    def get_info(self):
        if not self.mounted:
            return None
        try:
            stat = os.statvfs(self.mount_point)
            block_size = stat[0]
            total_blocks = stat[2]
            free_blocks = stat[3]

            return {
                "total_bytes": total_blocks * block_size,
                "free_bytes": free_blocks * block_size
            }
        except Exception as e:
            print(f"Error getting SD card info: {e}")
            return None