#!/usr/bin/env nix-shell
#!nix-shell -i bash -p bash coreutils gnused gum fastfetch xkcdpass sops ssh-to-age age sshpass envsubst pciutils usbutils mosquitto curl jq

### --> Default settings
export GUM_SPIN_SPINNER="minidot"
export GUM_SPIN_SPINNER_BOLD=true
export GUM_SPIN_SHOW_ERROR=true
export GUM_SPIN_TITLE_BOLD=true

NECESSARY_VARIABLES_LIST=( "TARGET_HOST" "REMOTE_PASS" "SSH_PUBLIC_KEY" "DOMAIN_NAME" \
"EMAIL_ADDRESS" "CF_DNS_API_TOKEN" "SENDER_EMAIL_ADDRESS" "SENDER_EMAIL_ADDRESS_PASSWORD" \
"SENDER_EMAIL_DOMAIN" "SENDER_EMAIL_PORT" "SERVER_OWNER_NAME" "SELECTED_SERVICES" \
"HOME_ROUTER_SUBNET" "HOME_ROUTER_IP" "HOME_SERVER_IP" )
### Default settings <--

user_input() {
  local VAR_NAME="${1}"
  local HEADER="${2}"
  local PLACEHOLDER="${3}"
  local REGEX="${4}"
  local ERROR_MSG="${5}"
  local SENSITIVE="${6:-false}"

  while true; do
    [[ "$SENSITIVE" == "false" ]] && INPUT_VALUE=$(gum input --placeholder "${PLACEHOLDER}" --header "${HEADER}")
    [[ "$SENSITIVE" == "true" ]] && INPUT_VALUE=$(gum input --password --placeholder "${PLACEHOLDER}" --header "${HEADER}")

    if [[ -z "${INPUT_VALUE}" ]]; then
      echo "❌ Error: Input cannot be empty. Please provide the necessary information."
      continue
    fi

    if [[ -n "${REGEX}" ]]; then
      if [[ ! "${INPUT_VALUE}" =~ ${REGEX} ]]; then
        echo "❌ Error: ${ERROR_MSG}"
        continue
      fi
    fi

    export "${VAR_NAME}"="${INPUT_VALUE}"
    break
  done
}

strictly_necessary_information() {
  export IP_REGEX='^([0-9]{1,3}\.){3}[0-9]{1,3}$'
  user_input "TARGET_HOST" "  Please provide the IP address of the target host :" "For example : 192.168.1.100" "${IP_REGEX}" "Invalid IP address format."
  user_input "REMOTE_PASS" "  Please enter the password for '${TARGET_USER}@${TARGET_HOST}' :" "${TARGET_HOST}'s password" "" "" "true"
}

necessary_information() {
  # Regex Definitions
  local SUBNET_REGEX='^([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}$'
  local DOMAIN_REGEX='^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
  local EMAIL_REGEX='^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
  local PORT_REGEX='^[0-9]{1,5}$'
  local SSH_KEY_REGEX='^ssh-[a-z0-9]+ [A-Za-z0-9+/]+.*'

  echo -e "\n\n➡️  This script needs information about the target you want to install NixOS on\n"
  #TARGET SETTINGS
  user_input "TARGET_HOST" "  Please provide the IP address of the target host :" "For example : 192.168.1.100" "${IP_REGEX}" "Invalid IP address format."
  user_input "REMOTE_PASS" "  Please enter the password for '${TARGET_USER}@${TARGET_HOST}' :" "${TARGET_HOST}'s password" "" "" "true"
  user_input "SSH_PUBLIC_KEY" "  Please provide the public SSH key of an authorized device :" "For example : ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGhcYDmjMo5YApLkk/3P3HZCnOSzm0uYewNAbxL8Fci8 user@your-pc" "${SSH_KEY_REGEX}" "Invalid SSH key format (must start with ssh-...)." "true"

  echo -e "\n\n➡️  You will access your services via a domain name (e.g. cloud.mydomain.com) and containers need credentials to create those subdomains\n"
  # TRAEFIK SETTINGS
  user_input "DOMAIN_NAME" "  Please provide the domain name (FQDN) your home server will use :" "For example : yourdomain.com" "${DOMAIN_REGEX}" "Invalid domain name format."
  user_input "EMAIL_ADDRESS" "  Please provide a valid email address (will be used for ACME, and your services) :" "For example : myemail@gmail.com" "${EMAIL_REGEX}" "Invalid email address format."
  user_input "CF_DNS_API_TOKEN" "  Please provide a cloudflare API token with DNS zone permission :" "For example : bA7hdvCOuXGytlNKohi3ZGtlVpf5CHpLuCMiJrE" "" "" "true"
  user_input "SERVER_OWNER_NAME" "  Please provide the name of the server owner :" "For example : Steve" "" ""

  echo -e "\n\n➡️  Some services will be able to send you emails. For that you need an email that supports sending emails (like Gmail for example)\n"
  # SMTP SETTINGS
  user_input "SENDER_EMAIL_ADDRESS" "  Please provide a valid sender email address :" "For example : myemail@gmail.com" "${EMAIL_REGEX}" "Invalid email address format."
  user_input "SENDER_EMAIL_ADDRESS_PASSWORD" "  Please provide the password of this email address :" "abcd efgh ijkl mnop" "" "" "true"
  user_input "SENDER_EMAIL_DOMAIN" "  Please provide the SMTP server endpoint :" "For Gmail : smtp.gmail.com" "${DOMAIN_REGEX}" "Invalid domain name format."
  user_input "SENDER_EMAIL_PORT" "  Please provide the smtp TLS port :" "For Gmail : 587" "${PORT_REGEX}" "Invalid port number."

  echo -e "\n\n➡️  This server will connect to your local network and you will configure its IP address\n"
  # NETWORK SETTINGS
  user_input "HOME_ROUTER_SUBNET" "  Please provide your home network subnet :" "For example 192.168.1.0/24" "${SUBNET_REGEX}" "Invalid subnet format (e.g. 192.168.1.1/24)."
  user_input "HOME_ROUTER_IP" "  Please provide the ip address of your router :" "Most likely 192.168.1.1 or 192.168.1.254" "${IP_REGEX}" "Invalid IP address format."
  user_input "HOME_SERVER_IP" "  Please choose the ip address that your server will use (i.e. any address in the 192.168.1.1/24 range that is not in use.) :" "For example 192.168.1.5" "${IP_REGEX}" "Invalid IP address format."
}

necessary_information_config() {
  echo -e "\n\n➡️  Please choose your configuration file :"
  local CONFIG_PATH="$(gum file)"

  source "${CONFIG_PATH}"
  local MISSING=0
  for VAR in "${NECESSARY_VARIABLES_LIST[@]}"; do
      if [[ -v "${VAR}" && -n "${!VAR}" ]]; then
        gum style "✅ "${VAR}" imported successfully from the config file"
      else
        gum style "❌ "${VAR}" is missing or empty"
        MISSING=1
      fi
  done

  if [[ "${MISSING}" -eq 1 ]]; then
    echo -e "\n❌ Please check your configuration file to include all necessary variables"
    exit 1
  fi

  if [[ "${DEBUG:-false}" == "true" ]]; then
    echo -e "\n✅ Debugging enabled."
    export DIR_COPY_FLAGS="ravu"
    export FILES_COPY_FLAGS="avu"
  else
    export DIR_COPY_FLAGS="rau"
    export FILES_COPY_FLAGS="au"
  fi
}

more_information_config() {
  sshpass -p "${REMOTE_PASS}" scp ${TARGET_USER}@${TARGET_HOST}:/etc/numbus-server/numbus-server.conf .
  source "numbus-server.conf"
}

setup_ssh() {
  mkdir -p final-nix-config/
  mkdir -p final-nix-config/etc/
  mkdir -p final-nix-config/etc/nixos/
  mkdir -p final-nix-config/home/
  mkdir -p final-nix-config/home/numbus-admin/
  mkdir -p final-nix-config/home/numbus-admin/.ssh/

  echo -e "\n\n✅ Generating new SSH key for numbus-admin..."
  chmod 700 final-nix-config/home/numbus-admin/.ssh/
  ssh-keygen -t "ed25519" -C "numbus-admin@numbus-server" -f "final-nix-config/home/numbus-admin/.ssh/id_ed25519" -N "" -q

  echo -e "\n\n➡️  Copying SSH key to target host '${TARGET_USER}@${TARGET_HOST}'..."
  if sshpass -p "${REMOTE_PASS}" ssh-copy-id -o StrictHostKeyChecking=no -i "final-nix-config/home/numbus-admin/.ssh/id_ed25519" "${TARGET_USER}@${TARGET_HOST}"; then
    echo -e "\n✅ SSH key copied successfully"
  else
    echo -e "\n❌ Failed to copy SSH key. Please check the host IP and password."
    exit 1
  fi
}

ssh_to_host() {
  local COMMAND="${1}"
  ssh -i "final-nix-config/home/numbus-admin/.ssh/id_ed25519" "${TARGET_USER}@${TARGET_HOST}" "${COMMAND}"
}

hardware_detection() {
  ### --> Get hardware information
  local TMPFILE="/tmp/nixos-installation-hardware-detection-temp-file"

  ssh_to_host 'bash -s' << SSHEND
for brand in Intel AMD NVIDIA; do
  if lspci -nn 2>/dev/null | grep -i "vga" | grep -iq "\${brand}"; then
    TARGET_GRAPHICS="true"
    TARGET_GRAPHICS_BRAND+=("\${brand}")
  else
    TARGET_GRAPHICS="false"
  fi
done

ls /dev/dri/ > /dev/null 2>&1 | grep -iq "renderD128" && TARGET_GRAPHICS_RENDERER="true" || TARGET_GRAPHICS_RENDERER="false"
lsusb > /dev/null 2>&1 | grep -iq "google" && TARGET_USB_CORAL="true" || TARGET_USB_CORAL="false"
lspci -nn > /dev/null 2>&1 | grep -iq "089a" && TARGET_PCIE_CORAL="true" || TARGET_PCIE_CORAL="false"
ls /dev/serial/by-id/ > /dev/null 2>&1 | grep -i "zigbee" && TARGET_ZIGBEE_DEVICE=\$(ls /dev/serial/by-id/ > /dev/null 2>&1 | grep -i "zigbee" | head -n 1) || TARGET_ZIGBEE_DEVICE=""

TARGET_INTERFACE=\$(ip -4 route show default | awk '{print \$5}' | head -n1)

if ls -l /sys/class/tpm/tpm0/ > /dev/null 2>&1; then
  TARGET_TPM="true"
  TARGET_TPM_VERSION=\$(cat /sys/class/tpm/tpm0/tpm_version_major)
else
  TARGET_TPM="false"
  TARGET_TPM_VERSION="N/A"
fi

HDD=1
DISK_DEVPATH=()
DISK_NAME=()
DISK_TYPE=()
DISK_HEALTH=()
DISK_ID=()

for DISK in \$(lsblk -x SIZE -d -n -e 7,11 -o NAME); do

  # Disk name and simple path
  DISK_DEVPATH+=("/dev/\$DISK")
  DISK_NAME+=("\$DISK")
  # Disk type
  HDD=\$(cat /sys/block/\$DISK/queue/rotational)
  TRANSPORT_PROTOCOL=\$(lsblk -x SIZE -d -n -e 7,11 -o TRAN /dev/\$DISK)
  if [[ "\$DISK" == "nvme*" ]]; then DISK_TYPE+=("NVMe");
  elif [[ "\$HDD" -eq 1 ]]; then DISK_TYPE+=("HDD");
  elif [[ "\$TRANSPORT_PROTOCOL" == "usb" ]]; then DISK_TYPE+=("USB");
  elif [[ "\$HDD" -eq 0 ]]; then DISK_TYPE+=("SSD");
  else DISK_TYPE+=("Other")
  fi

  # Disk health
  if [[ \$(echo "$REMOTE_PASS" | sudo -S smartctl -H /dev/\$DISK 2>/dev/null | grep 'self-assessment' | awk '{print \$6}') == "PASSED" ]]; then
    DISK_HEALTH+=("PASSED")
  else
    DISK_HEALTH+=("N/A")
  fi
  # Disk ID
  DISK_ID+=("\$(ls -l /dev/disk/by-id | grep -m1 "../../\$DISK" | awk '{print "/dev/disk/by-id/" \$9}')")
  DISK_SIZE+=("\$(lsblk -x SIZE -d -n -e 7,11 -o SIZE /dev/\$DISK)")
done

echo "# Hardware detection results on \$(date)" > "${TMPFILE}"
for var in \
  TARGET_GRAPHICS \
  TARGET_GRAPHICS_BRAND \
  TARGET_GRAPHICS_RENDERER \
  TARGET_USB_CORAL \
  TARGET_PCIE_CORAL \
  TARGET_ZIGBEE_DEVICE \
  TARGET_INTERFACE \
  TARGET_TPM \
  TARGET_TPM_VERSION; do
  echo "export \${var}=\${!var}" >> "${TMPFILE}"
done

for var in \
  DISK_DEVPATH \
  DISK_NAME \
  DISK_TYPE \
  DISK_HEALTH \
  DISK_ID \
  DISK_SIZE; do
  declare -p \${var} | sed 's/^declare /declare -g /' >> "${TMPFILE}"
done
SSHEND
  ### Get hardware information <--

  scp -i "final-nix-config/home/numbus-admin/.ssh/id_ed25519" "${TARGET_USER}@${TARGET_HOST}":"${TMPFILE}" "${TMPFILE}" &> /dev/null
  source "${TMPFILE}" && rm -rf "${TMPFILE}"

  ### --> Generate hardware-configuration.nix
  if ssh_to_host "sudo nixos-generate-config --no-filesystems --show-hardware-config" > final-nix-config/etc/nixos/hardware-configuration.nix; then
    echo -e "\n✅ Hardware configuration generated"
  else
    echo -e "\n❌ Failed to generate hardware configuration"
    exit 1
  fi
  ### Generate hardware-configuration.nix <--
}

services_selection() {
  echo -e "\n\n ➡️  You will now select the services you want installed on your server:"

  local AVAILABLE_SERVICES=( "frigate" "gitea" "home-assistant" "immich" "it-tools" \
  "nextcloud" "passbolt" "pi-hole" "virtualization" )

  local SERVICES_DESCRIPTION=( "Pi-Hole : Block ads on all your devices" \
  "Immich : Pictures and videos backup with local machine-learning" \
  "Nextcloud : No fuss Office 365 replacement" \
  "Passbolt: Security-first password manager with collaboration features" \
  "Home-Assistant : Manage your smart home and security cameras" \
  "Frigate [Home Assistant required] : Secure your house with security cameras" \
  "Gitea : Your own git platform" \
  "IT-tools : A set of useful tools when doing IT" \
  "Virtualization : Run Virtual Machines (KVM/QEMU) with Libvirt"
  )

  SELECTED_SERVICES=()
  local SELECTED_SERVICES_DESCRIPTION=$(gum choose --no-limit --header "Homelab services:" "${SERVICES_DESCRIPTION[@]}")

  for i in ${!AVAILABLE_SERVICES[@]}; do
    if printf '%s' "${SELECTED_SERVICES_DESCRIPTION}" | grep -iq "${AVAILABLE_SERVICES[${i}]}"; then
      SELECTED_SERVICES+=("${AVAILABLE_SERVICES[${i}]}")
    fi
  done

  export SELECTED_SERVICES
}

disks_selection() {
### --> Disk wiping warning
  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "
  ⚠️  $(gum style --foreground 212 'WARNING:') You will choose the disks to install NixOS on.
  !! PLEASE MAKE SURE YOU BACKED UP ANY IMPORTANT DATA !!
  !!  ALL DATA WILL BE WIPED ON THE DISKS YOU CHOOSE   !!
              Please press CTRL+C to abort.
  "
  gum confirm "Do you understand and wish to proceed?" || { echo -e "\n\n ❌ Aborting as requested."; exit 1; }

  echo -e "\n\n 🔎 Fetching and analyzing disks from target host... (This may take a moment)"
### Disk wiping warning <--

### --> Disk selection
  if [[ "${#DISK_NAME[@]}" -eq 0 ]]; then
    echo -e "\n ❌ No disks found on the target host. Aborting."
    exit 1
  fi

  local HEADER=$(printf "    %-12s %-12s %-12s %-12s %s" "Device" "Type" "Size" "SMART" "Path")

  for i in ${!DISK_NAME[@]}; do
    local GUM_PRINTED_ELEMENT=$(printf "%-12s %-12s %-12s %-12s %s" \
      "${DISK_NAME[${i}]}" "${DISK_TYPE[${i}]}" "${DISK_SIZE[${i}]}" \
      "${DISK_HEALTH[${i}]}" "${DISK_DEVPATH[${i}]}")
    local GUM_PRINTED_ELEMENTS+=("${GUM_PRINTED_ELEMENT}")
  done

  echo ""
  gum style --foreground 212 "➡️  Please choose one (stripe) or two (mirror) disks for your NixOS boot installation :"

  local SELECTED_BOOT_DISK=$(gum choose --limit 2 --header "${HEADER}" "${GUM_PRINTED_ELEMENTS[@]}")

  BOOT_DISKS_ID=()
  BOOT_DISKS_NAME=()
  for i in ${!DISK_NAME[@]}; do
    if printf '%s' "$SELECTED_BOOT_DISK" | grep -iqw "${DISK_NAME[${i}]}"; then
      BOOT_DISKS_ID+=("${DISK_ID[${i}]:-${DISK_DEVPATH[${i}]}}")
      BOOT_DISKS_NAME+=("${DISK_NAME[${i}]}")
      unset "GUM_PRINTED_ELEMENTS[${i}]"
    fi
  done

  if [[ "${#BOOT_DISKS_ID[@]}" -eq 0 ]]; then
    echo -e "\n\n ❌ No boot disk selected. Aborting."
    exit 1
  elif [[ "${#BOOT_DISKS_ID[@]}" -eq 1 ]]; then
    echo -e "\n\n ⚠️  One boot disk selected, continuing with striped boot disk configuration."
    echo -e "Consider using 2 boot disks instead to get data protection features on the boot disks."
    export BOOT_DISK_1_ID="${BOOT_DISKS_ID[0]}"
    export BOOT_DISK_1_NAME="${BOOT_DISKS_NAME[0]}"
    export BOOT_DISK_2_NAME=""
  elif [[ "${#BOOT_DISKS_ID[@]}" -eq 2 ]]; then
    echo -e "\n\n ✅ Two boot disks selected, continuing with mirrored boot disks configuration."
    echo -e "\n\n ⚠️ If the two disks are different sizes, the resulting usable space size will be \
                the one of the smallest disk."
    export BOOT_DISK_1_ID="${BOOT_DISKS_ID[0]}"
    export BOOT_DISK_2_ID="${BOOT_DISKS_ID[1]}"
    export BOOT_DISK_1_NAME="${BOOT_DISKS_NAME[0]}"
    export BOOT_DISK_2_NAME="${BOOT_DISKS_NAME[1]}"
  else
    echo -e "\n\n ❌ Unexpected bug. Please contact the developer. Aborting."
    exit 1
  fi

  echo ""
  gum style --foreground 212 "➡️  Please choose data and parity disks (up to 9 total) :"

  local SELECTED_DATA_DISK=$(gum choose --limit 9 --header "$HEADER" "${GUM_PRINTED_ELEMENTS[@]}")
### Disk selection <--

  DATA_DISKS_ID=()
  DATA_DISKS_TYPE=()
  for i in ${!DISK_NAME[@]}; do
    if printf '%s' "$SELECTED_DATA_DISK" | grep -iq "${DISK_NAME[${i}]}"; then
      DATA_DISKS_ID+=("${DISK_ID[${i}]:-${DISK_DEVPATH[${i}]}}")
      DATA_DISKS_TYPE+=("${DISK_TYPE[${i}]}")
    fi
  done

  if [[ "${#DATA_DISKS_ID[@]}" -eq 1 ]]; then
    export PARITY_DISK_NUMBER=0
    export CONTENT_DISK_NUMBER=1
  else
    export PARITY_DISK_NUMBER=$(((${#DATA_DISKS_ID[@]} + 2) / 3))
    export CONTENT_DISK_NUMBER=$((${#DATA_DISKS_ID[@]} - PARITY_DISK_NUMBER))
  fi

  export DATA_DISKS_ID
  export DATA_DISKS_TYPE
}

folder_tree_generation() {
  mkdir -p final-nix-config/mnt/
  mkdir -p final-nix-config/mnt/config/
  mkdir -p final-nix-config/mnt/data/

  mkdir -p final-nix-config/mnt/config/traefik/
  mkdir -p final-nix-config/mnt/config/traefik/rules/
  mkdir -p final-nix-config/mnt/config/traefik/certs/

  mkdir -p final-nix-config/etc/secrets/
  mkdir -p final-nix-config/etc/secrets/disks/
  mkdir -p final-nix-config/etc/numbus-server/
  mkdir -p final-nix-config/etc/nixos/misc/
  mkdir -p final-nix-config/etc/nixos/disks/
  mkdir -p final-nix-config/etc/nixos/pcie-coral/
  mkdir -p final-nix-config/etc/nixos/podman/
  mkdir -p final-nix-config/etc/nixos/secrets/

  mkdir -p final-nix-config/var/
  mkdir -p final-nix-config/var/lib/
  mkdir -p final-nix-config/var/lib/sops-nix
}

services_generation() {
  generate_db_creds() {
    local SERVICE_UPPER="${1}"
    export "${SERVICE_UPPER}_DB_NAME"="$(xkcdpass -d "-" -n 2)"
    export "${SERVICE_UPPER}_DB_USERNAME"="$(xkcdpass -d "-" -n 2)"
    export "${SERVICE_UPPER}_DB_PASSWORD"="$(xkcdpass -d "-")"
  }

  generate_network() {
    local SERVICE="${1}"
    local HAS_BACKEND="${2:-0}"
    local NETWORK_NAME_OVERRIDE="${3:-}"

    if [[ -z "${NETWORK_NAME_OVERRIDE}" ]]; then
      NETWORK_ID=$((NETWORK_ID + 1))
      PODMAN_NETWORKS+="      sudo -u numbus-admin podman network exists \"${SERVICE}_frontend\" || sudo -u numbus-admin podman network create --driver=\"bridge\" --subnet=\"172.16.${NETWORK_ID}.0/24\" --ip-range=\"172.16.${NETWORK_ID}.0/24\" --gateway=\"172.16.${NETWORK_ID}.254\" \"${SERVICE}_frontend\""$'\n'
      TRAEFIK_NETWORKS+="              ${SERVICE}_frontend:"$'\n'
      TRAEFIK_NETWORKS+="                ipv4_address: 172.16.${NETWORK_ID}.253"$'\n'
      TRAEFIK_REF_NETWORKS+="          ${SERVICE}_frontend:"$'\n'
      TRAEFIK_REF_NETWORKS+="            external: true"$'\n'

      if [[ "${HAS_BACKEND}" == "1" ]]; then
        NETWORK_ID=$((NETWORK_ID + 1))
        PODMAN_NETWORKS+="      sudo -u numbus-admin podman network exists \"${SERVICE}_backend\" || sudo -u numbus-admin podman network create --driver=\"bridge\" --subnet=\"172.16.${NETWORK_ID}.0/24\" --ip-range=\"172.16.${NETWORK_ID}.0/24\" --gateway=\"172.16.${NETWORK_ID}.254\" \"${SERVICE}_backend\""$'\n'
        SERVICES_NETWORK_IDS+=("$(( ${NETWORK_ID} - 1 )),${NETWORK_ID}:${SERVICE}")
      else
        SERVICES_NETWORK_IDS+=("${NETWORK_ID}:${SERVICE}")
      fi
    else
      NETWORK_ID=$((NETWORK_ID + 1))
      PODMAN_NETWORKS+="      sudo -u numbus-admin podman network exists \"${NETWORK_NAME_OVERRIDE}\" || sudo -u numbus-admin podman network create --driver=\"bridge\" --subnet=\"172.16.${NETWORK_ID}.0/24\" --ip-range=\"172.16.${NETWORK_ID}.0/24\" --gateway=\"172.16.${NETWORK_ID}.254\" \"${NETWORK_NAME_OVERRIDE}\""$'\n'
      TRAEFIK_NETWORKS+="              ${NETWORK_NAME_OVERRIDE}:"$'\n'
      TRAEFIK_NETWORKS+="                ipv4_address: 172.16.${NETWORK_ID}.253"$'\n'
      TRAEFIK_REF_NETWORKS+="          ${NETWORK_NAME_OVERRIDE}:"$'\n'
      TRAEFIK_REF_NETWORKS+="            external: true"$'\n'
      SERVICES_NETWORK_IDS+=("${NETWORK_ID}:${SERVICE}")
    fi

    export NETWORK_ID
    export PODMAN_NETWORKS
    export TRAEFIK_NETWORKS
    export TRAEFIK_REF_NETWORKS
    export SERVICES_NETWORK_IDS
  }

  NETWORK_ID=0
  PODMAN_NETWORKS=""
  TRAEFIK_NETWORKS=""
  TRAEFIK_REF_NETWORKS=""
  SERVICES_NETWORK_IDS=()

  echo -e "\n ✅ Writing configuration files for the selected homelab services..."
  cp -${FILES_COPY_FLAGS} templates/nix-config/configuration.nix final-nix-config/etc/nixos/configuration.nix
  cp -${FILES_COPY_FLAGS} templates/nix-config/podman/traefik.nix final-nix-config/etc/nixos/podman/traefik.nix
  envsubst < templates/podman-config/traefik/traefik.yaml > final-nix-config/mnt/config/traefik/traefik.yaml

  for service in "${SELECTED_SERVICES[@]}"; do
    # Copy podman container file
    [[ "${service}" != "virtualization" ]] && cp -${FILES_COPY_FLAGS} templates/nix-config/podman/"${service}".nix final-nix-config/etc/nixos/podman/"${service}".nix

    # Frigate config
    if [[ "${service}" == "frigate" ]]; then
      local FRIGATE_DEVICES_BLOCK=""
      [[ "${TARGET_GRAPHICS_RENDERER}" == "true" ]] && FRIGATE_DEVICES_BLOCK+="              - /dev/dri:/dev/dri\n"
      [[ "${TARGET_USB_CORAL}" == "true" ]]         && FRIGATE_DEVICES_BLOCK+="              - /dev/bus/usb:/dev/bus/usb\n"
      if [[ "${TARGET_PCIE_CORAL}" == "true" ]]; then
        FRIGATE_DEVICES_BLOCK+="              - /dev/apex_0:/dev/apex_0\n"
        sed -i "s|#    ./pcie-coral/coral.nix|    ./pcie-coral/coral.nix|" final-nix-config/etc/nixos/configuration.nix
        cp -${FILES_COPY_FLAGS} templates/nix-config/pcie-coral/* final-nix-config/etc/nixos/pcie-coral/
      fi
      if [[ -n "${FRIGATE_DEVICES_BLOCK}" ]]; then
        local REPLACEMENT="devices:\n${FRIGATE_DEVICES_BLOCK%\\n}"
        sed -i "s|# --- frigate devices --- #|$REPLACEMENT|" final-nix-config/etc/nixos/podman/frigate.nix
      fi

    # Gitea config
    elif [[ "${service}" == "gitea" ]]; then
      generate_network "${service}" "1"
      generate_db_creds "GITEA"

    # Home Assistant config
    elif [[ "${service}" == "home-assistant" ]]; then
      generate_network "${service}" "1"
      if [[ -n "${TARGET_ZIGBEE_DEVICE}" ]]; then
        local REPLACEMENT="devices:\n              - /dev/serial/by-id/${TARGET_ZIGBEE_DEVICE}:/dev/ttyUSB0"
        sed -i "s|# --- home-assistant devices --- #|$REPLACEMENT|" final-nix-config/etc/nixos/podman/home-assistant.nix
      fi
      export HOME_ASSISTANT_MQTT_USER="$(xkcdpass -d "-" -n 2)"
      export HOME_ASSISTANT_MQTT_PASSWORD="$(xkcdpass -d "-")"
      mkdir -p final-nix-config/mnt/config/mqtt/
      envsubst < templates/podman-config/home-assistant/mosquitto.conf > final-nix-config/mnt/config/mqtt/mosquitto.conf
      touch final-nix-config/mnt/config/mqtt/password.txt
      chmod 0700 final-nix-config/mnt/config/mqtt/password.txt
      mosquitto_passwd -b final-nix-config/mnt/config/mqtt/password.txt "$HOME_ASSISTANT_MQTT_USER" "$HOME_ASSISTANT_MQTT_PASSWORD"

    # Immich config
    elif [[ "${service}" == "immich" ]]; then
      generate_network "${service}" "1"
      generate_db_creds "IMMICH"
      local IMMICH_DEVICES_BLOCK=""
      if [[ "$TARGET_GRAPHICS_RENDERER" == "true" ]]; then
        IMMICH_DEVICES_BLOCK+="              - /dev/dri:/dev/dri\n"
      fi
      if [[ -n "$IMMICH_DEVICES_BLOCK" ]]; then
        local REPLACEMENT="devices:\n${IMMICH_DEVICES_BLOCK%\\n}"
        sed -i "s|# --- immich devices --- #|$REPLACEMENT|" final-nix-config/etc/nixos/podman/immich.nix
      fi

    # Nextcloud config
    elif [[ "${service}" == "nextcloud" ]]; then
      generate_network "${service}" "0" "nextcloud-aio"
      envsubst < templates/podman-config/traefik/nextcloud.yaml > final-nix-config/mnt/config/traefik/rules/nextcloud.yaml

    # Passbolt config
    elif [[ "${service}" == "passbolt" ]]; then
      generate_network "${service}" "1"
      generate_db_creds "PASSBOLT"
      envsubst < templates/podman-config/traefik/headers.yaml > final-nix-config/mnt/config/traefik/rules/headers.yaml
      envsubst < templates/podman-config/traefik/tls.yaml > final-nix-config/mnt/config/traefik/rules/tls.yaml

    # Pi-Hole config
    elif [[ "${service}" == "pi-hole" ]]; then
      generate_network "${service}" "0"
      export FTLCONF_WEBSERVER_PASSWORD="$(xkcdpass -d "-")"

    # Virtualization config
    elif [[ "${service}" == "virtualization" ]]; then
      sed -i "s|#  virtualisation.libvirtd.enable = true;|  virtualisation.libvirtd.enable = true;|" final-nix-config/etc/nixos/configuration.nix
      sed -i "s|#  programs.virt-manager.enable = true;|  programs.virt-manager.enable = true;|" final-nix-config/etc/nixos/configuration.nix
      sed -i 's|extraGroups = \[ "wheel" \];|extraGroups = [ "wheel" "libvirtd" ];|' final-nix-config/etc/nixos/configuration.nix

    # Other podman containers with no special configuration
    else
      generate_network "${service}" "0"
    fi
  done

  export PODMAN_NETWORKS
  export TRAEFIK_NETWORKS
  export TRAEFIK_REF_NETWORKS
}

disks_generation() {
  # Boot disk(s)
  echo -e "\n\n ✅  Generating disko configuration from templates..."
  local TEMPLATE_FILE="templates/nix-config/disks/boot-${#BOOT_DISKS_ID[@]}.nix"
  (envsubst < "$TEMPLATE_FILE") > final-nix-config/etc/nixos/disks/disko.nix

  SNAPRAID_CONTENT_FILES=""
  SNAPRAID_DATA_DISKS=""
  SNAPRAID_PARITY_FILES=""
  MOUNT_DEPENDENCIES_START=""
  MOUNT_DEPENDENCIES_STOP=""

  # Striped configuration
  if [[ "$CONTENT_DISK_NUMBER" -eq 1 && "$PARITY_DISK_NUMBER" -eq 0 ]]; then
    export j=1
    export CONTENT_DISK_ID="${DATA_DISKS_ID[0]}"
    if [[ "${DATA_DISKS_TYPE[0]}" == "HDD" ]]; then export ALLOW_DISCARDS="false"; else export ALLOW_DISCARDS="true"; fi
    (envsubst < "templates/nix-config/disks/content.nix") >> final-nix-config/etc/nixos/disks/disko.nix
    sed -i "s|/mnt/content-1|/mnt/data|" final-nix-config/etc/nixos/disks/disko.nix

  # SnapRAID configuration
  elif [[ ${CONTENT_DISK_NUMBER} -gt 0 && ${PARITY_DISK_NUMBER} -gt 0 ]]; then
    sed -i "s|#    ./disks/snapraid.nix|    ./disks/snapraid.nix|" final-nix-config/etc/nixos/configuration.nix
    j=0
    for i in $(seq 0 $(($CONTENT_DISK_NUMBER - 1))); do
      export j=$((j + 1))
      export CONTENT_DISK_ID="${DATA_DISKS_ID[${i}]}"
      if [[ "${DATA_DISKS_TYPE[${i}]}" == "HDD" ]]; then export ALLOW_DISCARDS="false"; else export ALLOW_DISCARDS="true"; fi
      (envsubst < "templates/nix-config/disks/content.nix") >> final-nix-config/etc/nixos/disks/disko.nix
      SNAPRAID_CONTENT_FILES+="      \"/mnt/content-${j}/snapraid.content\""$'\n'
      SNAPRAID_DATA_DISKS+="      d${j} = \"/mnt/content-${j}\";"$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.cryptsetup}/bin/cryptsetup open ${CONTENT_DISK_ID}-part1 crypted-content-${j} --key-file /etc/secrets/disks/content-${j}"$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.coreutils}/bin/mkdir -p /mnt/content-${j}"$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.util-linux}/bin/mount /mnt/content-${j}"$'\n'
      MOUNT_DEPENDENCIES_STOP+="      \${pkgs.util-linux}/bin/umount /mnt/content-${j}"$'\n'
      MOUNT_DEPENDENCIES_STOP+="      \${pkgs.cryptsetup}/bin/cryptsetup close crypted-content-${j}"$'\n'
    done
    echo -e "\n ✅ Generated $CONTENT_DISK_NUMBER data disk configuration(s)."
    j=0
    for i in $(seq $CONTENT_DISK_NUMBER $((${#DATA_DISKS_ID[@]} - 1))); do
      export j=$((j + 1))
      export PARITY_DISK_ID="${DATA_DISKS_ID[${i}]}"
      if [[ "${DATA_DISKS_TYPE[${i}]}" == "HDD" ]]; then export ALLOW_DISCARDS="false"; else export ALLOW_DISCARDS="true"; fi
      (envsubst < "templates/nix-config/disks/parity.nix") >> final-nix-config/etc/nixos/disks/disko.nix
      SNAPRAID_PARITY_FILES+="      \"/mnt/parity-${j}/snapraid.parity\""$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.cryptsetup}/bin/cryptsetup open ${PARITY_DISK_ID}-part1 crypted-parity-${j} --key-file /etc/secrets/disks/parity-${j}"$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.coreutils}/bin/mkdir -p /mnt/parity-${j}"$'\n'
      MOUNT_DEPENDENCIES_START+="      \${pkgs.util-linux}/bin/mount /mnt/parity-${j}"$'\n'
      MOUNT_DEPENDENCIES_STOP+="      \${pkgs.util-linux}/bin/umount /mnt/parity-${j}"$'\n'
      MOUNT_DEPENDENCIES_STOP+="      \${pkgs.cryptsetup}/bin/cryptsetup close crypted-parity-${j}"$'\n'
    done
    echo -e "\n ✅ Generated $PARITY_DISK_NUMBER parity disk configuration(s)."
    [[ ${CONTENT_DISK_NUMBER} -eq 1 && ${PARITY_DISK_NUMBER} -eq 1 ]] && SNAPRAID_CONTENT_FILES+="      \"/mnt/content-0/snapraid.content\""$'\n' && SNAPRAID_DATA_DISKS+="      d0 = \"/mnt/content-0\";"$'\n'
    export SNAPRAID_CONTENT_FILES
    export SNAPRAID_DATA_DISKS
    export SNAPRAID_PARITY_FILES
    export MOUNT_DEPENDENCIES_START
    export MOUNT_DEPENDENCIES_STOP
  fi

  envsubst < templates/nix-config/disks/snapraid.nix > final-nix-config/etc/nixos/disks/snapraid.nix

  # Close the disko.nix block
  cat <<'EOF' >> final-nix-config/etc/nixos/disks/disko.nix
    };
  };
}
EOF

  echo -e "\n ✅ Final disko configuration created."

  SPINDOWN_DISKS_ID=()
  if [[ "${#DATA_DISKS_ID[@]}" -gt 0 ]]; then
    for i in ${!DATA_DISKS_ID[@]}; do
      if [[ "${DATA_DISKS_TYPE[${i}]}" == "HDD" ]]; then
        SPINDOWN_DISKS_ID+=("${DATA_DISKS_ID[${i}]}")
      fi
    done
    if [[ "${#SPINDOWN_DISKS_ID[@]}" -gt 0 ]]; then 
      cp -${FILES_COPY_FLAGS} templates/nix-config/disks/spindown.nix final-nix-config/etc/nixos/disks/
      local FORMATTED_DISKS=""
      for disk in "${SPINDOWN_DISKS_ID[@]}"; do
        FORMATTED_DISKS+="    \"$disk\"\n"
      done
      sed -i "s|DISK_LIST|${FORMATTED_DISKS}|" final-nix-config/etc/nixos/disks/spindown.nix
      echo -e "\n ✅ Disk spindown configuration created."
    fi
  fi
### Config generation <--
}

keys_generation() {
### --> Generate disk keys
  for i in $(seq 1 "${#BOOT_DISKS_ID[@]}"); do
    PASS="$(xkcdpass)"
    echo -n "$PASS" > "final-nix-config/etc/secrets/disks/boot-${i}"
    chmod 600 "final-nix-config/etc/secrets/disks/boot-${i}"
    ssh_to_host 'bash -s' << EOF
echo "$REMOTE_PASS" | sudo -S mkdir -p /etc/secrets/disks/
echo "$REMOTE_PASS" | sudo -S bash -c "printf '%s' '$PASS' > /etc/secrets/disks/boot-${i}"
EOF
  done
  for i in $(seq 1 "$CONTENT_DISK_NUMBER"); do
    PASS="$(xkcdpass)"
    echo -n "$PASS" > "final-nix-config/etc/secrets/disks/content-${i}"
    chmod 600 "final-nix-config/etc/secrets/disks/content-${i}"
    ssh_to_host 'bash -s' << EOF
echo "$REMOTE_PASS" | sudo -S bash -c "printf '%s' '$PASS' > /etc/secrets/disks/content-${i}"
EOF
  done
  for i in $(seq 1 "$PARITY_DISK_NUMBER"); do
    PASS="$(xkcdpass)"
    echo -n "$PASS" > "final-nix-config/etc/secrets/disks/parity-${i}"
    chmod 600 "final-nix-config/etc/secrets/disks/parity-${i}"
    ssh_to_host 'bash -s' << EOF
echo "$REMOTE_PASS" | sudo -S bash -c "printf '%s' '$PASS' > /etc/secrets/disks/parity-${i}"
EOF
  done
### Generate disk keys <--

  echo -e "\n ✅ Generating sops-nix keys..."
  ssh-to-age -private-key -i final-nix-config/home/numbus-admin/.ssh/id_ed25519 > final-nix-config/var/lib/sops-nix/key.txt
  export SOPS_PUBLIC_KEY=$(age-keygen -y final-nix-config/var/lib/sops-nix/key.txt)

  echo -e "\n ✅ Generating sops-nix configuration files..."
  envsubst < templates/nix-config/sops-nix/.sops.yaml > final-nix-config/etc/nixos/.sops.yaml

  echo -e "\n ✅ Encrypting secrets in the correct file..."
  envsubst < "templates/nix-config/sops-nix/secrets.yaml" \
    | sops encrypt --filename-override secrets.yaml \
    --input-type yaml --output-type yaml \
    --age $SOPS_PUBLIC_KEY \
    --output final-nix-config/etc/nixos/secrets/secrets.yaml
}

nix_generation() {
  echo -e "\n ✅ Copying the configuration to the new machine..."
  cp -${FILES_COPY_FLAGS} templates/nix-config/flake.nix final-nix-config/etc/nixos/
  cp -${FILES_COPY_FLAGS} templates/nix-config/misc/* final-nix-config/etc/nixos/misc/

  echo "${SERVER_OWNER_NAME:-User}" > final-nix-config/etc/numbus-server/owner
  echo -e "\n ✅ Writing correct ips to configuration.nix..."
  sed -i "s|HOME_SERVER_IP|${HOME_SERVER_IP}|g" final-nix-config/etc/nixos/misc/networking.nix
  sed -i "s|HOME_ROUTER_IP|${HOME_ROUTER_IP}|g" final-nix-config/etc/nixos/misc/networking.nix
  sed -i "s|TARGET_INTERFACE|${TARGET_INTERFACE}|g" final-nix-config/etc/nixos/misc/networking.nix
  sed -i "s|DOMAIN_NAME|${DOMAIN_NAME}|" final-nix-config/etc/nixos/misc/mail.nix
  sed -i "s|EMAIL_ADDRESS|${EMAIL_ADDRESS}|" final-nix-config/etc/nixos/misc/mail.nix
  sed -i "s|SENDER_MAIL_DOMAIN|${SENDER_EMAIL_DOMAIN}|" final-nix-config/etc/nixos/misc/mail.nix
  sed -i "s|SENDER_MAIL_ADDRESS|${SENDER_EMAIL_ADDRESS}|" final-nix-config/etc/nixos/misc/mail.nix
  sed -i "s*PODMAN_NETWORKS*${PODMAN_NETWORKS//$'\n'/\\n}*" final-nix-config/etc/nixos/misc/activation.nix
  sed -i "s|TRAEFIK_NETWORKS|${TRAEFIK_NETWORKS//$'\n'/\\n}|" final-nix-config/etc/nixos/podman/traefik.nix
  sed -i "s|TRAEFIK_REF_NETWORKS|${TRAEFIK_REF_NETWORKS//$'\n'/\\n}|" final-nix-config/etc/nixos/podman/traefik.nix
  if [[ "${TARGET_TPM}" == "true" && ${TARGET_TPM_VERSION} -eq 2 ]]; then
    sed -i "s|#    ./disks/pcr-check.nix|    ./disks/pcr-check.nix|" final-nix-config/etc/nixos/configuration.nix
    sed -i "s|#  boot.initrd.systemd.tpm2.enable = true;|  boot.initrd.systemd.tpm2.enable = true;|" final-nix-config/etc/nixos/configuration.nix
    sed -i "s|#  systemIdentity.enable = true;|  systemIdentity.enable = true;|" final-nix-config/etc/nixos/configuration.nix
    cp -${FILES_COPY_FLAGS} templates/nix-config/disks/pcr-check.nix final-nix-config/etc/nixos/disks/
  fi
}

sum_up() {
### --> Disk selection recap
  DISK_RECAP_CONTENT=$(cat << EOF
### Disk Configuration Summary

Please review the selected disk layout before proceeding.

**Boot Disks (${#BOOT_DISKS_ID[@]}):**
* **Boot 1:** \`${BOOT_DISKS_ID[0]}\`
$( [[ -n "${BOOT_DISKS_ID[1]:-}" ]] && echo "* **Boot 2:** \`${BOOT_DISKS_ID[1]}\`" || echo "* **Boot 2:** *Not configured*" )

**Data Disks ($CONTENT_DISK_NUMBER):**
$( j=1 && for i in $(seq 0 $(($CONTENT_DISK_NUMBER - 1))); do echo "* **Data ${j}:** \`${DATA_DISKS_ID[${i}]}\`" && j=$((j + 1)); done )
$( [[ $CONTENT_DISK_NUMBER -eq 0 ]] && echo "* *Not configured*" )

**Parity Disks ($PARITY_DISK_NUMBER):**
$( [[ $PARITY_DISK_NUMBER -gt 0 ]] && j=1 && for i in $(seq $CONTENT_DISK_NUMBER $((${#DATA_DISKS_ID[@]} - 1))); do echo "* **Parity ${j}:** \`${DATA_DISKS_ID[${i}]}\`" && j=$((j + 1)); done )
$( [[ $PARITY_DISK_NUMBER -eq 0 ]] && echo "* *Not configured*" )
EOF
)

  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "$(gum format <<< "${DISK_RECAP_CONTENT}")"
  gum confirm "Proceed with this disk configuration?" || { echo -e "\n\n ❌ Aborting as requested."; exit 1; }
### Disk selection recap <--

### Keys recap <--
  KEYS_RECAP_CONTENT=$(cat << EOF
### Generated Secrets Summary

Please save these secrets in a secure location (e.g., a password manager).

**Service Credentials:**
$( [[ -n ${HOME_ASSISTANT_MQTT_USER:-} ]] && echo "* **Home Assistant MQTT User:** \`${HOME_ASSISTANT_MQTT_USER}\`" && \
echo "* **Home Assistant MQTT Password:** \`$HOME_ASSISTANT_MQTT_PASSWORD\`" \
|| echo "* **Home assistant:** *Not configured*" )
$( [[ -n ${FTLCONF_WEBSERVER_PASSWORD:-} ]] && echo "* **Pi-hole Web Password:** \`${FTLCONF_WEBSERVER_PASSWORD}\`" \
|| echo "* **Pi-hole:** *Not configured*" )
$( [[ -n ${PASSBOLT_DB_NAME:-} ]] && echo "* **Passbolt DB Name:** \`${PASSBOLT_DB_NAME}\`" && \
echo "* **Passbolt DB User:** \`${PASSBOLT_DB_USERNAME}\`" && echo "* **Passbolt DB Password:** \`${PASSBOLT_DB_PASSWORD}\`" \
|| echo "* **Passbolt:** *Not configured*" )
$( [[ -n ${IMMICH_DB_NAME:-} ]] && echo "* **Immich DB Name:** \`${IMMICH_DB_NAME}\`" && \
echo "* **Immich DB User:** \`${IMMICH_DB_USERNAME}\`" && echo "* **Immich DB Password:** \`${IMMICH_DB_PASSWORD}\`" \
|| echo "* **Immich:** *Not configured*" )
$( [[ -n ${GITEA_DB_NAME:-} ]] && echo "* **Gitea DB Name:** \`${GITEA_DB_NAME}\`" && \
echo "* **Gitea DB User:** \`${GITEA_DB_USERNAME}\`" && echo "* **Gitea DB Password:** \`${GITEA_DB_PASSWORD}\`" \
|| echo "* **Gitea:** *Not configured*" )

**Disk Encryption Keys:**
$( for i in $(seq 1 "${#BOOT_DISKS_ID[@]}"); do f="final-nix-config/etc/secrets/disks/boot-${i}"; [[ -f "$f" ]] && echo "* **Boot Disk $i Key:** \`$(cat "$f")\`"; done )
$( for i in $(seq 1 "$CONTENT_DISK_NUMBER"); do f="final-nix-config/etc/secrets/disks/content-${i}"; [[ -f "$f" ]] && echo "* **Content Disk $i Key:** \`$(cat "$f")\`"; done )
$( for i in $(seq 1 "$PARITY_DISK_NUMBER"); do f="final-nix-config/etc/secrets/disks/parity-${i}"; [[ -f "$f" ]] && echo "* **Parity Disk $i Key:** \`$(cat "$f")\`"; done )
EOF
)

  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "$(gum format <<< "${KEYS_RECAP_CONTENT}")"
  gum confirm "Do you want to deploy NixOS on the target host?" || { echo -e "\n\n ❌ Aborting as requested"; exit 1; } 
### Keys recap <--
}

cloudflare_dns_setup() {
  local ZONE_ID
  local RECORD_COUNT
  local IS_MATCHING
  local DNS_RECORDS

  create_records() {
    local SUBDOMAIN="${1}"
    local CREATION_STATUS

    CREATION_STATUS=$(curl -s -X POST "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records" \
      -H "Authorization: Bearer ${CF_DNS_API_TOKEN}" \
      -H "Content-Type: application/json" \
      --data "{\"type\":\"A\",\"name\":\"${SUBDOMAIN}\",\"content\":\"${HOME_SERVER_IP}\",\"ttl\":1,\"proxied\":false}" | jq -r '.success')

    if [[ "${CREATION_STATUS}" == "true" ]]; then
      echo " ✅ Successfully created a DNS record for ${SUBDOMAIN}"
    else
      echo -e " ❌ Failed to create a DNS record for ${SUBDOMAIN}. Check documentation to \n
                  learn how you can create them manually."
    fi
  }

  erase_records() {
    local SUBDOMAIN="${1}"

    gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "
    ⚠️  $(gum style --foreground 212 'WARNING:') One or more existing type A DNS records found for \`${SUBDOMAIN}\`.
    This script can clear those DNS records for you and create the correct ones needed for the server.
        If you are unsure that these records are actually in use, please select \"no\"."
    gum confirm "Select \"yes\" to clear ALL EXISTING type A DNS records for this subdomain and automatically create the correct ones." \
    || { echo -e "\n ⚠️ DNS records for ${SUBDOMAIN} will not be updated"; return 0; }

    RECORD_IDS=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records?name=${SUBDOMAIN}&type=A" \
      -H "Authorization: Bearer ${CF_DNS_API_TOKEN}" \
      -H "Content-Type: application/json" | jq -r '.result[].id')

    for id in ${RECORD_IDS}; do
      curl -s -X DELETE "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${id}" \
        -H "Authorization: Bearer ${CF_DNS_API_TOKEN}" \
        -H "Content-Type: application/json" > /dev/null 2>&1
    done

    create_records "${SUBDOMAIN}"
  }

  echo -e "\n\n ☁️  Configuring Cloudflare DNS records..."

  SELECTED_SERVICES_DNS=()
  for service in "${SELECTED_SERVICES[@]}"; do
    if [[ "${service}" == "nextcloud" ]]; then
      SELECTED_SERVICES_DNS+=("nextcloud.${DOMAIN_NAME}" "nextcloud-aio.${DOMAIN_NAME}")
    elif [[ "${service}" == "virtualization" ]]; then
      :
    else
      SELECTED_SERVICES_DNS+=("${service}.${DOMAIN_NAME}")
    fi
  done
  SELECTED_SERVICES_DNS+=("traefik.${DOMAIN_NAME}")

  # Get Zone ID
  ZONE_ID=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=${DOMAIN_NAME}" \
    -H "Authorization: Bearer ${CF_DNS_API_TOKEN}" \
    -H "Content-Type: application/json" | jq -r '.result[0].id')

  if [[ "${ZONE_ID}" == "null" || -z "${ZONE_ID}" ]]; then
    echo -e "\n\n ⚠️  Could not fetch Zone ID for ${DOMAIN_NAME}. Please check your Cloudflare \"DNS ZONE\" API token"
    echo "Check the Numbus-Server documentation to learn how to get one."
  fi

  # Check for existing records and create them if non-existent
  for service_domain in "${SELECTED_SERVICES_DNS[@]}"; do
    DNS_RECORDS=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records?name=${service_domain}&type=A" \
      -H "Authorization: Bearer ${CF_DNS_API_TOKEN}" \
      -H "Content-Type: application/json")

    RECORD_COUNT=$(echo "${DNS_RECORDS}" | jq '.result | length')

    if [[ "${RECORD_COUNT}" -eq 0 ]]; then
      echo -e "\n ⚠️ No DNS record found for ${service_domain}"
      create_records "${service_domain}"
    elif [[ "${RECORD_COUNT}" -eq 1 ]]; then
      if [[ $(echo "${DNS_RECORDS}" | jq ".result[0].content == \"${HOME_SERVER_IP}\"") == "true" ]]; then
        echo -e "\n ✅ DNS record already configured for ${service_domain}"
      else
        echo -e "\n ⚠️ No DNS record found for ${service_domain}"
        erase_records "${service_domain}"
      fi
    elif [[ "${RECORD_COUNT}" -gt 1 ]]; then
      erase_records "${service_domain}"
    fi
  done
}

export_configuration() {
  cp deploy.conf final-nix-config/etc/numbus-server/numbus-server.conf

  local CONFIG_EXPORT_DIR="final-nix-config/etc/numbus-server/"
  local CONFIG_EXPORT_FILE="${CONFIG_EXPORT_DIR}/numbus-server.conf"

  cp -${FILES_COPY_FLAGS} templates/post-install/numbus-server.sh "$CONFIG_EXPORT_DIR"

  echo "export TARGET_INTERFACE=\"${TARGET_INTERFACE}\""              >> $CONFIG_EXPORT_FILE
  echo -e "\n# SERVER SETTINGS"                                       >> $CONFIG_EXPORT_FILE
  echo "export SERVER_OWNER_NAME=\"${SERVER_OWNER_NAME:-User}\""      >> $CONFIG_EXPORT_FILE
  echo -e "\n# DISK SETTINGS"                                         >> $CONFIG_EXPORT_FILE
  echo "export BOOT_DISKS_ID=\"(${BOOT_DISKS_ID[@]})\""               >> $CONFIG_EXPORT_FILE
  echo "export DATA_DISKS_ID=\"(${DATA_DISKS_ID[@]})\""               >> $CONFIG_EXPORT_FILE
  echo "export DATA_DISKS_TYPE=\"(${DATA_DISKS_TYPE[@]})\""           >> $CONFIG_EXPORT_FILE
  echo "export SPINDOWN_DISKS_ID=\"(${SPINDOWN_DISKS_ID[@]})\""       >> $CONFIG_EXPORT_FILE
  echo "export CONTENT_DISK_NUMBER=\"${CONTENT_DISK_NUMBER}\""        >> $CONFIG_EXPORT_FILE
  echo "export PARITY_DISK_NUMBER=\"${PARITY_DISK_NUMBER}\""          >> $CONFIG_EXPORT_FILE
  echo -e "\n# TPM SETTINGS"                                          >> $CONFIG_EXPORT_FILE
  echo "export TARGET_TPM=\"${TARGET_TPM}\""                          >> $CONFIG_EXPORT_FILE
  echo "export TARGET_TPM_VERSION=\"${TARGET_TPM_VERSION:-}\""        >> $CONFIG_EXPORT_FILE
  echo -e "\n# Podman SETTINGS"                                       >> $CONFIG_EXPORT_FILE
  echo "export PODMAN_NETWORKS=\"${PODMAN_NETWORKS}\""                >> $CONFIG_EXPORT_FILE
  echo "export TRAEFIK_NETWORKS=\"${TRAEFIK_NETWORKS}\""              >> $CONFIG_EXPORT_FILE
  echo "export TRAEFIK_REF_NETWORKS=\"${TRAEFIK_REF_NETWORKS}\""      >> $CONFIG_EXPORT_FILE
  echo "export SERVICES_NETWORK_IDS=\"(${SERVICES_NETWORK_IDS[@]})\"" >> $CONFIG_EXPORT_FILE
}

deploy() {
  git -C "/home/nixosd/numbus-server" add -f "final-nix-config"

  echo -e "\n\n🔄 Deploying to the remote server..."
  nix run github:nix-community/nixos-anywhere -- \
    --flake ./final-nix-config/etc/nixos#numbus-server \
    --extra-files final-nix-config \
    --chown "/home/numbus-admin/" 1000:1000 \
    --target-host ${TARGET_USER}@${TARGET_HOST}

  echo -e "\n\n✅ Installation successfull !"
  sleep 1
}

postrun_action() {
  TARGET_USER="numbus-admin"
  TARGET_HOST="${HOME_SERVER_IP}"
  REMOTE_PASS="changeMe!"

  echo -e "\n\n Now the remote machine will reboot. You will need to input the boot disk(s) passphrase.
  This will be the only time you will have to do so, it will be automatic in the future."

  gum spin --title "Rebooting the remote..." -- sleep 120

  gum confirm "➡️  Select \"yes\" once the machine rebooted and you unlocked the disks." || { echo -e "\n\n❌ Aborting as requested."; exit 1; }

  FOUND="false"
  i="0"
  while [[ "${FOUND}" == "false" ]]; do
    if ping -c1 -W1 $HOME_SERVER_IP >/dev/null 2>&1; then
      FOUND="true"
      echo -e "\n✅ Ping ${HOME_SERVER_IP} successful ! Continuing..."
    else
      (i++)
      if [[ "\${i}" -gt 150 ]]; then
        echo -e "\n\n❌ Could not connect to the server after 150 retries. \
  This is most likely due to a networking issue. Please double check your network settings. Aborting."
        exit 1
      fi
    fi
  done

  if [[ "${TARGET_TPM}" == "true" && ${TARGET_TPM_VERSION} -eq 2 ]]; then
    gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "
        A TPM version 2 has been detected on the system. You can choose to enable automatic disk decryption on boot.
    Enabling automatic disk decryption on boot means that you won't have to enter your disk password everytime you start your server.
      This comes in very handy if you don't plan to leave your server accessible with a keyboard or if you don't have an IP KVM.

    Note : This feature is currently vulnerable to on-site attacks. This means that an attacker with physical access to your machine
                            could steal the password from the TPM, and therefore have access to all your date.

                                      Do you want to enable automatic disk decryption on boot ?"

    if gum confirm "➡️  I understand, 'yes' to proceed."; then
      ssh_to_host 'bash -s' << EOF
echo "Enrolling boot disk key to TPM..."

BOOT_DISKS_ID=(${BOOT_DISKS_ID[@]})
DISK_PATH=""
j=1

for i in \${!BOOT_DISKS_ID[@]}; do
  if [[ echo "\${BOOT_DISKS_ID[\${i}]}" | grep -iq "nvme" ]]; then
    DISK_PATH="/dev/\${BOOT_DISKS_ID[\${i}]}p2"
  else
    DISK_PATH="/dev/\${BOOT_DISKS_ID[\${i}]}2"
  fi
  echo ${REMOTE_PASS} | sudo -S systemd-cryptenroll --tpm2-device=auto --tpm2-pcrs=0+7 --unlock-key-file=/etc/secrets/disks/boot-\${j} \${DISK_PATH}
  j=\$((j + 1))
done

echo "Getting PCRS 15 hash..."
PCR_HASH=\$(echo ${REMOTE_PASS} | sudo -S systemd-analyze pcrs 15 --json=short)

echo ${REMOTE_PASS} | sudo -S sed -i "s|PCR_HASH|\${PCR_HASH}|" /etc/nixos/configuration.nix
EOF
    else
      echo "Skipping TPM configuration."
    fi
    else
      echo "No supported TPM detected (TPM version 2 required). Skipping TPM configuration."
  fi

  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "
            ⚠️  $(gum style --foreground 212 'WARNING:') You will now set the password of the numbus-admin user.
You will almost never user it. Consider using a very strong password : you can write it down
securely on a hidden sheet of paper or add it to your password manager (locally with Passbolt
                    with any other online password manager provider)."

  gum confirm "➡️  I understand, 'yes' to proceed." || { echo -e "\n\n❌ Aborting as requested."; exit 1; }

  echo $REMOTE_PASS | sudo -S passwd numbus-admin
}

nix_update() {
  echo -e "\n\n🔄 Updating NixOS on the remote server..."

  nixos-rebuild --target-host numbus-admin@${TARGET_HOST} \
    --use-remote-sudo switch --flake final-nix-config/etc/nixos#numbus-server
}

congrats() {
  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "
  ⚠️  $(gum style --foreground 212 'CONGRATULATIONS !!:') You now have a working home server. \
Data stored on there will be fully yours and protected. Keep in my mind this comes with the \
responsability of managing it and keeping it secure. Now, you have to log in the webpages of \
the services you installed. Create an admin account for all of them and configure them (or keep \
it simple and use defaults) and take care to note down all the passwords. Change all default passwords \
        and create user accounts for your family or friends that will use the server.

                                        Cheers !!"
}

set -euo pipefail

fastfetch --logo nixos --structure ' '

cat << EOF

 ██████   █████                            █████                          
▒▒██████ ▒▒███                            ▒▒███                           
 ▒███▒███ ▒███  █████ ████ █████████████   ▒███████  █████ ████  █████    
 ▒███▒▒███▒███ ▒▒███ ▒███ ▒▒███▒▒███▒▒███  ▒███▒▒███▒▒███ ▒███  ███▒▒     
 ▒███ ▒▒██████  ▒███ ▒███  ▒███ ▒███ ▒███  ▒███ ▒███ ▒███ ▒███ ▒▒█████    
 ▒███  ▒▒█████  ▒███ ▒███  ▒███ ▒███ ▒███  ▒███ ▒███ ▒███ ▒███  ▒▒▒▒███   
 █████  ▒▒█████ ▒▒████████ █████▒███ █████ ████████  ▒▒████████ ██████    
▒▒▒▒▒    ▒▒▒▒▒   ▒▒▒▒▒▒▒▒ ▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒ ▒▒▒▒▒▒▒▒    ▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒     

  █████████                                                               
 ███▒▒▒▒▒███                                                              
▒███    ▒▒▒   ██████  ████████  █████ █████  ██████  ████████             
▒▒█████████  ███▒▒███▒▒███▒▒███▒▒███ ▒▒███  ███▒▒███▒▒███▒▒███            
 ▒▒▒▒▒▒▒▒███▒███████  ▒███ ▒▒▒  ▒███  ▒███ ▒███████  ▒███ ▒▒▒             
 ███    ▒███▒███▒▒▒   ▒███      ▒▒███ ███  ▒███▒▒▒   ▒███                 
▒▒█████████ ▒▒██████  █████      ▒▒█████   ▒▒██████  █████                
 ▒▒▒▒▒▒▒▒▒   ▒▒▒▒▒▒  ▒▒▒▒▒        ▒▒▒▒▒     ▒▒▒▒▒▒  ▒▒▒▒▒                 

EOF

sleep 1

# Choose the action
ACTION_ANSWER=$(gum choose "[1] 🌐 Deploy NixOS on a remote machine" "[2] 💽 Deploy NixOS on a remote machine with a file configuration" "[3] 🛠️ Update a NixOS remote machine")

if [[ "$ACTION_ANSWER" == "[1] 🌐 Deploy NixOS on a remote machine" ]]; then
  TARGET_USER="nixos"
  echo -e "\n➡️  Proceeding with deployment…"
  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "➡️  On the target host : start the computer and boot into the NixOS iso.
              Launch a console and set up a new user password"
  gum confirm "Do you understand and wish to proceed?" || { echo "❌ Aborting as requested"; exit 1; }
  strictly_necessary_information
  necessary_information
  setup_ssh
  hardware_detection
  services_selection
  disks_selection
  folder_tree_generation
  services_generation
  disks_generation
  keys_generation
  nix_generation
  cloudflare_dns_setup
  sum_up
  export_configuration
  deploy
  postrun_action
  congrats

elif [[ "$ACTION_ANSWER" == "[2] 💽 Deploy NixOS on a remote machine with a file configuration" ]]; then
  TARGET_USER="nixos"
  echo -e "\n➡️  Proceeding with deployment using a config file…"
  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "➡️  On the target host : start the computer and boot into the NixOS iso.
              Launch a console and set up a new user password"
  gum confirm "Do you understand and wish to proceed?" || { echo "❌ Aborting as requested"; exit 1; }
  necessary_information_config
  setup_ssh
  hardware_detection
  disks_selection
  folder_tree_generation
  services_generation
  disks_generation
  keys_generation
  nix_generation
  cloudflare_dns_setup
  sum_up
  export_configuration
  deploy
  postrun_action
  congrats

elif [[ "$ACTION_ANSWER" == "[3] 🛠️ Update a NixOS remote machine" ]]; then
  TARGET_USER="numbus-admin"
  echo -e "\n➡️  Proceeding with update…"
  gum style --border normal --margin "1" --padding "1 2" --border-foreground 212 "➡️  On the target host : make sure the NixOS installation you want
        to update is up-and-running, accessible with SSH"
  gum confirm "Do you understand and wish to proceed?" || { echo "❌ Aborting as requested."; exit 1; }
  strictly_necessary_information
  setup_ssh
  more_information_config
  folder_tree_generation
  nix_generation
  nix_update
  congrats

else
  echo "Aborting - you did not type 1, 2 or 3"
  exit 1
fi