#!/bin/bash

# For my use, debian for the little one, ubuntu for the big ones

# From .env, following values:
# LINODE_API_KEY  (used for all Linode API calls below, via curl)
# WHICH_DOMAIN
# ROOT_PASS
source .env
# All Linode API requests use the API key sourced from .env above:
#   curl -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/...
#ROOT_PASS=$(for w in {1..3}; do echo -n $(cat /usr/share/dict/words | grep -v "'" | sed -n $(echo "$(cat /usr/share/dict/words | grep -v "'" | wc -l) * $RANDOM / 32768 + 1" | bc)p); done)
#ROOT_PASS="StartRootPass5678"
SCRIPT_ACTION=$1
LINODE_LABEL=$2
# oily 2111036
WHICH_DOMAIN="2111036"
LOGFILE="./linodes.log"

# Pre-existing Valheim volume, attached to every Linode at creation time.
# The filesystem (mkfs.ext4) was already created; see voldirections.txt.
VOLUME_ID="18073448"
VOLUME_NAME="ValVol202609"
VOLUME_DEVICE="/dev/disk/by-id/scsi-0Linode_Volume_$VOLUME_NAME"
VOLUME_MOUNT="/mnt/$VOLUME_NAME"

if [[ "$SCRIPT_ACTION" == "" || "$SCRIPT_ACTION" == "--help" || "$SCRIPT_ACTION" == "-?" ]]; then
  echo "Linode helper script: create-linode.sh <action> <label> [args]"
  echo "Create:  create-linode.sh c <new label>"
  echo "         (fixed size: 8GB shared, newest Debian image;"
  echo "          attaches and mounts volume $VOLUME_NAME)"
  echo "Destroy: create-linode.sh d <label>"
  echo "Connect: create-linode.sh x <label>"
  echo "         create-linode.sh x <label> get <remote source> <local dest>"
  echo "         create-linode.sh x <label> put <local source> <remote dest>"
  echo "Update record: create-linode.sh a <label> <subdomain>"
  echo "List:    create-linode.sh l"
  echo "         (lists all Linodes, no label needed)"
fi

# Create
if [[ "$SCRIPT_ACTION" == "c" ]]; then

  # Fixed size: 8GB shared, newest Debian image
  INSTANCE_SIZE="g6-standard-4"
  INSTANCE_IMAGE="linode/debian13"

  curl -s -H "Content-Type: application/json" \
    -H "Authorization: Bearer $LINODE_API_KEY" \
    -X POST -d '{
          "label": "'$LINODE_LABEL'",
          "region": "us-central",
          "type": "'$INSTANCE_SIZE'",
          "image": "'$INSTANCE_IMAGE'",
          "root_pass": "'$ROOT_PASS'",
          "authorized_users": ["ni7ne_midpriv"]
        }' \
    https://api.linode.com/v4/linode/instances | jq .

  sleep 60
  INSTANCE_IP=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .ipv4[]' | sed -e "s/\"//g")
  INSTANCE_ID=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .id' | sed -e "s/\"//g")
  echo "Instance IP: $INSTANCE_IP"
  echo "Instance ID: $INSTANCE_ID"

  # Attach the pre-existing Valheim volume (see voldirections.txt).
  # The volume must be attached to a running Linode; the image boots on create.
  curl -s -H "Content-Type: application/json" \
    -H "Authorization: Bearer $LINODE_API_KEY" \
    -X POST -d '{
          "linode_id": '$INSTANCE_ID',
          "persist_across_boots": true
        }' \
    https://api.linode.com/v4/volumes/$VOLUME_ID/attach | jq .

  # Give the volume a moment to appear on the instance before mounting it.
  sleep 15

  # SSH CONFIG BLOCK
  ssh -o "StrictHostKeyChecking no" root@$INSTANCE_IP "mkdir -p $VOLUME_MOUNT"
  ssh -o "StrictHostKeyChecking no" root@$INSTANCE_IP "mount $VOLUME_DEVICE $VOLUME_MOUNT"
  # Mount on every boot, without duplicating the line on re-runs.
  ssh -o "StrictHostKeyChecking no" root@$INSTANCE_IP "grep -q '$VOLUME_DEVICE' /etc/fstab || echo '$VOLUME_DEVICE $VOLUME_MOUNT ext4 defaults,noatime,nofail 0 2' >> /etc/fstab"
  # END SSH CONFIG BLOCK

  echo "$(date -Iminutes) --- Id:$INSTANCE_ID --- IP:$INSTANCE_IP Summoned $LINODE_LABEL with volume $VOLUME_ID." >>$LOGFILE
  echo "Started with root pass $ROOT_PASS"

fi

# List
if [[ "$SCRIPT_ACTION" == "l" ]]; then
  curl -s -H "Authorization: Bearer $LINODE_API_KEY" \
    https://api.linode.com/v4/linode/instances | jq .
fi

# Destroy
if [[ "$SCRIPT_ACTION" == "d" ]]; then
  INSTANCE_IP=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .ipv4[]' | sed -e "s/\"//g")
  INSTANCE_ID=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .id' | sed -e "s/\"//g")
  echo "Destroying ID:$INSTANCE_ID Hit Ctrl-C in the next 10 seconds to cancel."
  sleep 15
  curl -s -H "Authorization: Bearer $LINODE_API_KEY" \
    -X DELETE https://api.linode.com/v4/linode/instances/$INSTANCE_ID
  echo "$(date -Iminutes) --- Id:$INSTANCE_ID --- IP:$INSTANCE_IP Destroyed $LINODE_LABEL." >>$LOGFILE
fi

# Connect
if [[ "$SCRIPT_ACTION" == "x" ]]; then

  REMOTE_ACTION=$3
  SCP_SOURCE=$4
  SCP_DEST=$5

  INSTANCE_IP=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .ipv4[]' | sed -e "s/\"//g")
  if [[ "$REMOTE_ACTION" == "get" ]]; then
    echo "get </~/source> <localdest>"
    scp $INSTANCE_IP:/home/finn/$SCP_SOURCE $SCP_DEST
  fi

  if [[ "$REMOTE_ACTION" == "put" ]]; then
    echo "put <localsource> </~/dest>"
    scp $SCP_SOURCE $INSTANCE_IP:/home/finn/$SCP_DEST
  fi

  if [[ "$REMOTE_ACTION" == "" ]]; then
    echo "Connecting: $INSTANCE_IP"
    ssh root@$INSTANCE_IP
  fi

fi

# Update record
if [[ "$SCRIPT_ACTION" == "a" ]]; then

  INSTANCE_IP=$(curl -s -H "Authorization: Bearer $LINODE_API_KEY" https://api.linode.com/v4/linode/instances | jq '.data[] | select(.label == "'$LINODE_LABEL'") | .ipv4[]' | sed -e "s/\"//g")

  NI_SUBDOMAIN=$3
  echo "Previous value:"
  curl -s -H "Authorization: Bearer $LINODE_API_KEY" \
    https://api.linode.com/v4/domains/$WHICH_DOMAIN/records | jq .

  sleep 3

  echo "Updating records with ip $INSTANCE_IP..."

  #ni7ne:
  curl -s -H "Content-Type: application/json" \
    -H "Authorization: Bearer $LINODE_API_KEY" \
    -X POST -d '{
	  "type": "A",
          "name": "'$NI_SUBDOMAIN'",
          "target": "'$INSTANCE_IP'",
          "priority": 0,
          "weight": 0,
          "port": 0,
          "service": null,
          "protocol": null,
          "ttl_sec": 14400,
          "tag": null
        }' \
    https://api.linode.com/v4/domains/$WHICH_DOMAIN/records | jq .

  echo "Update complete."

fi