#!/bin/bash

# Parse flags
AUTO_VERSION=false
AUTO_PUSH=false
IMAGE_VERSION=""

for arg in "$@"; do
    case $arg in
        --auto-version)
            AUTO_VERSION=true
            ;;
        --auto-push)
            AUTO_PUSH=true
            ;;
        *)
            if [ "$IMAGE_VERSION" == "" ] && [[ ! "$arg" =~ ^-- ]]; then
                IMAGE_VERSION=$arg
            fi
            ;;
    esac
done

# Determine version
if [ "$AUTO_VERSION" = true ]; then
    IMAGE_VERSION=$(node -p "require('./package.json').version")
    printf "\nAuto-version enabled. Using version from package.json: %s\n" "$IMAGE_VERSION"
elif [ "$IMAGE_VERSION" == "" ]; then
    printf "\nYou did not specify the Docker image version to build"
    printf "\n\nSyntax:\n\n    build-image.sh <version> [--auto-push]"
    printf "\n    build-image.sh --auto-version [--auto-push]\n\n"
    exit 1
fi

REGISTRY_URL="registry.budakova.org"
IMAGE_NAME=$(node -p "require('./package.json').name")
IMAGE_TAG=$REGISTRY_URL/$IMAGE_NAME:$IMAGE_VERSION

# Check if image already exists in registry (only when using auto-version)
if [ "$AUTO_VERSION" = true ]; then
    printf "\nChecking if image %s already exists in registry...\n" "$IMAGE_TAG"
    if docker manifest inspect $IMAGE_TAG > /dev/null 2>&1; then
        printf "\nERROR: Image %s already exists in registry.\n" "$IMAGE_TAG"
        printf "Please update the version in package.json before building.\n\n"
        exit 1
    fi
    printf "Image does not exist in registry. Proceeding with build.\n"
fi

# Check for push preference
if [ "$AUTO_PUSH" = true ]; then
    PUSH_IMAGE="y"
    printf "\nAuto-push enabled. Image will be pushed to registry.\n"
else
    read -p "BUILD: Push new image to registry [y/n]? " -n 1 -r
    echo    # (optional) move to a new line
    PUSH_IMAGE="$REPLY"
fi

printf "\nBUILD START ...\n\n"

docker build . -t $IMAGE_TAG

if [[ "$PUSH_IMAGE" =~ ^[Yy]$ ]]
then
    printf "\nPushing image ...\n\n"
    docker push $IMAGE_TAG
fi

printf "\nBUILD DONE!\n\n"