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

SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
REPO_ROOT=$(cd -- "$SCRIPT_DIR/.." && pwd)

validate_instance() {
  local instance=$1

  if [[ ${#instance} -gt 42 || ! $instance =~ ^[a-z0-9]([a-z0-9-]*[a-z0-9])?$ ]]; then
    echo "instance must be 1-42 lowercase letters, digits, or internal hyphens: $instance" >&2
    exit 2
  fi
}

default_instance=$(basename -- "$REPO_ROOT" | tr '[:upper:]_' '[:lower:]-')
instance=${1:-$default_instance}
validate_instance "$instance"

namespace=${DEV_NAMESPACE:-vibes}
pvc=${DEV_PVC:-control-vibes-control-data}
pvc_mount_root=${DEV_PVC_MOUNT_ROOT:-/home/node}
domain=${DEV_DOMAIN:-control.k.mancave.link}
host=${2:-$instance.$domain}
release="hello-dev-$instance"
source_dir=$(realpath -- "$REPO_ROOT/src")
pvc_mount_root=$(realpath -- "$pvc_mount_root")

if [[ ! -d $source_dir ]]; then
  echo "source directory does not exist: $source_dir" >&2
  exit 1
fi

if [[ $source_dir != "$pvc_mount_root/"* ]]; then
  echo "source directory is outside the PVC mount at $pvc_mount_root: $source_dir" >&2
  exit 1
fi

if [[ ! $host =~ ^[a-z0-9]([a-z0-9.-]*[a-z0-9])?$ ]]; then
  echo "invalid hostname: $host" >&2
  exit 2
fi

pvc_subpath=${source_dir#"$pvc_mount_root/"}

helm template "$release" "$SCRIPT_DIR/helm" \
  --namespace "$namespace" \
  --set-string "instance=$instance" \
  --set-string "ingress.host=$host" \
  --set-string "sharedVolume.claimName=$pvc" \
  --set-string "sharedVolume.subPath=$pvc_subpath" \
  | kubectl apply --namespace "$namespace" -f -

kubectl rollout status "deployment/$release" --namespace "$namespace" --timeout=120s

echo "Development instance '$instance' is live at http://$host"