#!/usr/bin/env bash
#ddev-generated

## Description: Use a different key-value store for Redis
## Usage: redis-backend <image> [optimize]
## Example: ddev redis-backend redis-alpine optimize

REDIS_DOCKER_IMAGE=${1:-}
REDIS_CONFIG=${2:-}
NAME=$REDIS_DOCKER_IMAGE

function show_help() {
  cat <<EOF
Usage: ddev redis-backend <image|alias> [optimize]

Choose from predefined aliases, or provide any Redis-compatible Docker image.
Note that not every Docker image can work right away, and you may need to override
the "command:" in the docker-compose.redis_extra.yaml file

Available aliases:
  redis            redis:7
  redis-alpine     redis:7-alpine
  valkey           valkey/valkey:8
  valkey-alpine    valkey/valkey:8-alpine

Custom backend:
  You can specify any Docker image, e.g.:
    ddev redis-backend redis:6

Optional:
  optimize         Apply additional Redis configuration with resource limits
  optimized        Same as optimize

Examples:
  ddev redis-backend redis-alpine optimize
  ddev redis-backend valkey
  ddev redis-backend redis:7.2-alpine
EOF
  exit 0
}

function optimize_config() {
  [[ "$REDIS_CONFIG" != "optimized" && "$REDIS_CONFIG" != "optimize" ]] && return
  ddev dotenv set .ddev/.env.redis --redis-optimized=true
}

function change_hostname() {
  [[ "${REDIS_HOSTNAME:-}" == "" ]] && return
  ddev dotenv set .ddev/.env.redis --redis-hostname="$REDIS_HOSTNAME"
}

function cleanup() {
  rm -f "$DDEV_APPROOT/.ddev/.env.redis"
  rm -rf "$DDEV_APPROOT/.ddev/redis/"
  rm -f "$DDEV_APPROOT/.ddev/docker-compose.redis.yaml" "$DDEV_APPROOT/.ddev/docker-compose.redis_extra.yaml"

  redis_volume="ddev-$(ddev status -j | docker run -i --rm ddev/ddev-utilities jq -r '.raw.name')_redis"
  if docker volume ls -q | grep -qw "$redis_volume"; then
    ddev stop
    docker volume rm "$redis_volume"
  fi
}

function check_docker_image() {
  echo "Pulling ${REDIS_DOCKER_IMAGE}..."
  if ! docker pull "$REDIS_DOCKER_IMAGE"; then
    echo >&2 "❌ Unable to pull ${REDIS_DOCKER_IMAGE}"
    exit 2
  fi
}

function use_docker_image() {
  [[ "$REDIS_DOCKER_IMAGE" != "redis:7" ]] && ddev dotenv set .ddev/.env.redis --redis-docker-image="$REDIS_DOCKER_IMAGE"
  REPO=$(ddev add-on list --installed -j 2>/dev/null | docker run -i --rm ddev/ddev-utilities jq -r '.raw[] | select(.Name=="redis") | .Repository // empty' 2>/dev/null)
  ddev add-on get "${REPO:-ddev/ddev-redis}"
}

case "$REDIS_DOCKER_IMAGE" in
  redis)
    NAME="Redis 7"
    REDIS_DOCKER_IMAGE="redis:7"
    ;;
  redis-alpine)
    NAME="Redis 7 Alpine"
    REDIS_DOCKER_IMAGE="redis:7-alpine"
    ;;
  valkey)
    NAME="Valkey 8"
    REDIS_DOCKER_IMAGE="valkey/valkey:8"
    REDIS_HOSTNAME="valkey"
    ;;
  valkey-alpine)
    NAME="Valkey 8 Alpine"
    REDIS_DOCKER_IMAGE="valkey/valkey:8-alpine"
    REDIS_HOSTNAME="valkey"
    ;;
  ""|--help|-h)
    show_help
    ;;
  *)
    NAME="$REDIS_DOCKER_IMAGE"
    # Allow unknown image, nothing to override
    ;;
esac

check_docker_image
cleanup
optimize_config
change_hostname
use_docker_image

echo
echo "✅ Redis backend: $REDIS_DOCKER_IMAGE"
if [[ "$REDIS_CONFIG" == "optimized" || "$REDIS_CONFIG" == "optimize" ]]; then
  echo "⚙️ Redis config: optimized"
else
  echo "⚙️ Redis config: default"
fi

echo
echo "📝 Commit the '.ddev' directory to version control"

echo
echo "🔄 Redis config available after 'ddev restart'"