#!/bin/bash
set -euo pipefail

ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
cd "$ROOT_DIR"

if [ -f .env ]; then
  while IFS= read -r line || [ -n "$line" ]; do
    # Skip empty lines and comments (leading whitespace ignored).
    [[ $line =~ ^[[:space:]]*# ]] && continue
    [[ -z ${line//[[:space:]]/} ]] && continue

    if [[ $line =~ ^([A-Za-z_][A-Za-z0-9_]*)=(.*)$ ]]; then
      key="${BASH_REMATCH[1]}"
      value="${BASH_REMATCH[2]}"

      # Strip trailing comments and surrounding whitespace.
      value="${value%%#*}"
      value="${value%$'\r'}"
      value="${value#${value%%[![:space:]]*}}"
      value="${value%${value##*[![:space:]]}}"

      # Remove simple single or double quotes around the value.
      if [[ $value =~ ^\".*\"$ || $value =~ ^\'.*\'$ ]]; then
        value="${value:1:${#value}-2}"
      fi

      case "$key" in
        SPYDER_IMAGE|BUILDX_PLATFORMS|BUILDX_BUILDER_NAME|LOCAL_IMAGE_NAME)
          export "$key"="$value"
          ;;
      esac
    fi
  done < .env
fi

: "${SPYDER_IMAGE:?SPYDER_IMAGE must be set in .env or environment}"
PLATFORMS=${BUILDX_PLATFORMS:-linux/amd64,linux/arm64}
BUILDER=${BUILDX_BUILDER_NAME:-spyder-buildx}

if ! docker buildx inspect "$BUILDER" >/dev/null 2>&1; then
  docker buildx create --name "$BUILDER" --use
else
  docker buildx use "$BUILDER"
fi

if [[ -n "${REGISTRY_HOST:-}" && -n "${REGISTRY_USER:-}" && -n "${REGISTRY_TOKEN:-}" ]]; then
  echo "Logging in to $REGISTRY_HOST for non-interactive push"
  echo "$REGISTRY_TOKEN" | docker login "$REGISTRY_HOST" --username "$REGISTRY_USER" --password-stdin
fi

echo "Building multi-arch image for $SPYDER_IMAGE on platforms: $PLATFORMS"

docker buildx build \
  --platform "$PLATFORMS" \
  --tag "$SPYDER_IMAGE" \
  --push \
  --file Dockerfile \
  .

echo "Image pushed: $SPYDER_IMAGE"