./backup.nix

{ pkgs, lib, ... }: let
  inherit (lib) enabled;
in {
  home-manager.sharedModules = [{
    home.file."wsl-backup.nu" = {
      executable = true;
      text = /* nu */ ''
        #!/usr/bin/env nu
        def log [msg: string, level: string = "INFO"] {
          let timestamp = (date now | format date '%Y-%m-%d %H:%M:%S')
          print $"[($timestamp)] ($level): ($msg)"
        }
        def main [] {
          log "Starting NixOS-WSL backup..."
          let nixos_host    = "pear"
          let github_repo   = "jamesukiyo/nixos"
          let windows_drive = "c"
          let windows_user  = "james"
          let windows_base  = $"/mnt/($windows_drive)/Users/($windows_user)"
          let backup_path   = $"($windows_base)/nixos-wsl-backup"
          let backup_file   = $"($backup_path)/nixos.wsl"
          log "Checking prerequisites..."
          if not ($windows_base | path exists) {
            log $"Windows mount not available at ($windows_base)" "ERROR"
            exit 1
          }
          try {
            ^mkdir --parents $backup_path
          } catch { |e|
            log $"Cannot create backup directory: ($e.msg)" "ERROR"
            exit 1
          }
          let temp_dir = try {
            ^mktemp -d
          } catch { |e|
            log $"Cannot create temp directory: ($e.msg)" "ERROR"
            exit 1
          }
          log "Prerequisites check passed"
          log "Cloning repository..."
          cd $temp_dir
          try {
            ^git clone https://github.com/($github_repo).git repo
            cd repo
          } catch { |e|
            log $"Git clone failed: ($e.msg)" "ERROR"
            ^rm -rf $temp_dir
            exit 1
          }
          log "Building system tarball..."
          try {
            ^sudo nix run .#nixosConfigurations.($nixos_host).config.system.build.tarballBuilder --accept-flake-config
          } catch { |e|
            log $"Tarball build failed: ($e.msg)" "ERROR"
            ^rm -rf $temp_dir
            exit 1
          }
          let tarball_path = "nixos.wsl"
          if not ($tarball_path | path exists) {
            log $"Could not find generated tarball at ($tarball_path)" "ERROR"
            ^rm -rf $temp_dir
            exit 1
          }
          log $"Found tarball: ($tarball_path)"
          log "Copying to backup location..."
          try {
            ^cp $tarball_path $backup_file
            log "Backup completed successfully!" "SUCCESS"
            log $"Backup located at: ($backup_file)"
          } catch { |e|
            log $"Copy failed: ($e.msg)" "ERROR"
            log $"Tarball available at: ($temp_dir)/repo/($tarball_path)" "WARN"
            ^rm -rf $temp_dir
            exit 1
          }
          ^rm -rf $temp_dir
          log "Cleanup completed"
        }
      '';
    };
  }];
  systemd.services.nixos-wsl-backup = {
    description = "NixOS-WSL System Backup";
    serviceConfig = {
      Type      = "oneshot";
      User      = "root";
      ExecStart = "/home/jam/wsl-backup.nu";
    };
    path = with pkgs; [nix git nushell];
  };
  systemd.timers.nixos-wsl-backup = enabled {
    description = "Run NixOS-WSL backup every 6 hours";
    wantedBy    = ["timers.target"];
    timerConfig = {
      OnBootSec       = "1min";
      OnUnitActiveSec = "4h";
      Persistent      = true;
    };
  };
}