# SD Card image configuration for Raspberry Pi
{
  config,
  modulesPath,
  lib,
  ...
}:

{
  imports = [
    (modulesPath + "/installer/sd-card/sd-image-aarch64.nix")
  ];

  sdImage = {
    # Compress with zstd for smaller download
    compressImage = true;

    # Auto-expand root partition on first boot
    expandOnBoot = true;
  };

  # Image filename based on hostname
  image.fileName = "${config.networking.hostName}-sd-image.img";

  # Disable ZFS to avoid build issues on SD image
  boot.supportedFilesystems = lib.mkForce [
    "vfat"
    "ext4"
  ];

  # sd-image.nix imports all-hardware.nix which adds x86 modules like dw-hdmi
  # that don't exist in the RPi4 kernel. Filter them out.
  boot.initrd.availableKernelModules = lib.mkForce [
    "xhci_pci"
    "usbhid"
    "usb_storage"
  ];
}