#!/usr/bin/env bash
set -euo pipefail

export NIX_CONFIG="${NIX_CONFIG:-}
experimental-features = nix-command flakes
accept-flake-config = false
warn-dirty = false
"

MODE="${1:-validate}"

ensure_nix_profile() {
  if [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
    . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
  elif [ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
    . "$HOME/.nix-profile/etc/profile.d/nix.sh"
  fi
}

ensure_nix_profile

if ! command -v nix >/dev/null 2>&1; then
  echo "ERROR: nix is not available in PATH. Run bash scripts/codex-setup.sh first." >&2
  exit 127
fi

hosts_json="$(nix eval --json --no-use-registries --no-accept-flake-config .#nixosConfigurations --apply builtins.attrNames)"
hosts="$(echo "$hosts_json" | jq -r '.[]')"

echo "Hosts:"
echo "$hosts"

echo
echo "Checking for obvious committed secrets..."
if grep -RInE 'github_pat_|ghp_|access-tokens|hashedPassword[[:space:]]*=' \
  --exclude-dir=.git \
  --exclude=flake.lock \
  .; then
  echo
  echo "WARNING: Potential secrets or password hashes found. Review before committing."
else
  echo "No obvious token patterns found."
fi

echo
echo "Checking Nix formatting with nixpkgs-fmt..."
nix run --no-use-registries --no-accept-flake-config github:NixOS/nixpkgs/nixos-25.11#nixpkgs-fmt -- --check .

echo
echo "Running statix lint..."
nix run --no-use-registries --no-accept-flake-config github:NixOS/nixpkgs/nixos-25.11#statix -- check .

echo
echo "Evaluating host toplevel derivations..."
for host in $hosts; do
  echo "==> $host"
  nix eval --raw --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.toplevel.drvPath"

  # lxc-* hosts deploy via a directly pct-restore-able tarball instead of
  # nixos-install (see docs/auto-installer.md); proxmox-* hosts can
  # alternatively be built as a standalone disk image (see
  # docs/proxmox-images.md). Both are otherwise-unvalidated buildable
  # surface, easy to silently break without this.
  case "$host" in
    lxc-*)
      echo "==> $host (tarball)"
      nix eval --raw --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.tarball.drvPath"
      ;;
    proxmox-*)
      echo "==> $host (diskoImagesScript)"
      nix eval --raw --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.diskoImagesScript.drvPath"
      ;;
  esac
done

echo
echo "Evaluating buildable packages..."
packages_json="$(nix eval --json --no-use-registries --no-accept-flake-config .#packages.x86_64-linux --apply builtins.attrNames)"
packages="$(echo "$packages_json" | jq -r '.[]')"
for pkg in $packages; do
  echo "==> packages.x86_64-linux.${pkg}"
  nix eval --raw --no-use-registries --no-accept-flake-config ".#packages.x86_64-linux.${pkg}"
done

if [[ "$MODE" == "dry-run" ]]; then
  echo
  echo "Running dry-run builds for all hosts. This will not create result symlinks."
  for host in $hosts; do
    echo "==> Dry-run build: $host"
    nix build --dry-run --no-link --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.toplevel"

    case "$host" in
      lxc-*)
        echo "==> Dry-run build: $host (tarball)"
        nix build --dry-run --no-link --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.tarball"
        ;;
      proxmox-*)
        echo "==> Dry-run build: $host (diskoImagesScript)"
        nix build --dry-run --no-link --no-use-registries --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.diskoImagesScript"
        ;;
    esac
  done

  echo
  echo "Running dry-run builds for all packages."
  for pkg in $packages; do
    echo "==> Dry-run build: packages.x86_64-linux.${pkg}"
    nix build --dry-run --no-link --no-use-registries --no-accept-flake-config ".#packages.x86_64-linux.${pkg}"
  done
fi

echo
echo "Maintenance checks complete."