#!/bin/sh -e
# Script to check for a new gomplate version and update it in Dockerfile

GOMPLATE_REPO="hairyhenderson/gomplate"
DOCKERFILE="${1:-.}/Dockerfile"

# Check if Dockerfile exists
if [ ! -f "$DOCKERFILE" ]; then
    echo "Error: Dockerfile not found at $DOCKERFILE"
    exit 1
fi

# Get the latest release version from GitHub
echo "Checking for the latest gomplate version on GitHub..."
LATEST_VERSION=$(curl -s "https://api.github.com/repos/${GOMPLATE_REPO}/releases/latest" | grep -o '"tag_name": "[^"]*"' | head -1 | cut -d'"' -f4)

if [ -z "$LATEST_VERSION" ]; then
    echo "Error: Could not fetch the latest version from GitHub"
    exit 1
fi

echo "Latest gomplate version: $LATEST_VERSION"

# Get the current version from Dockerfile
CURRENT_VERSION=$(grep 'ENV GOMPLATE_VERSION' "$DOCKERFILE" | sed 's/.*GOMPLATE_VERSION=//;s/[[:space:]]*$//')

echo "Current gomplate version in Dockerfile: $CURRENT_VERSION"

# Check if versions are different
if [ "$LATEST_VERSION" = "$CURRENT_VERSION" ]; then
    echo "✓ Already on the latest version ($LATEST_VERSION)"
    exit 0
fi

echo "✓ New version available: $LATEST_VERSION"
echo "Updating Dockerfile..."

# Update the Dockerfile - use a more specific pattern to avoid multiple replacements
sed -i '' "s/ENV GOMPLATE_VERSION=.*/ENV GOMPLATE_VERSION=${LATEST_VERSION}/" "$DOCKERFILE"

if grep -q "ENV GOMPLATE_VERSION=${LATEST_VERSION}" "$DOCKERFILE"; then
    echo "✓ Successfully updated Dockerfile to version $LATEST_VERSION"
    echo ""
    echo "Changes made:"
    echo "  - GOMPLATE_VERSION: $CURRENT_VERSION → $LATEST_VERSION"
else
    echo "Error: Failed to update Dockerfile"
    exit 1
fi