#!/bin/sh

if [ -z "$1" ]; then
  echo "::error::Must supply java version argument"
  exit 1
fi

if [ -z "$2" ]; then
  echo "::error::Must supply java path argument"
  exit 1
fi

EXPECTED_JAVA_VERSION=$1
EXPECTED_PATH=$2
SETUP_JAVA_VERSION=$3
REQUIRE_CONCRETE_VERSION=$4

EXPECTED_JAVA_VERSION=$(echo $EXPECTED_JAVA_VERSION | cut -d'+' -f1)
if [[ $EXPECTED_JAVA_VERSION == 8 ]] || [[ $EXPECTED_JAVA_VERSION == 8.* ]]; then
  EXPECTED_JAVA_VERSION="1.${EXPECTED_JAVA_VERSION}"
fi
if [[ $EXPECTED_JAVA_VERSION == *-ea* ]]; then
  EXPECTED_JAVA_VERSION=$(echo $EXPECTED_JAVA_VERSION | cut -d'-' -f1 | cut -d'.' -f1)
fi

ACTUAL_JAVA_VERSION="$(java -version 2>&1)"
echo "Found java version: $ACTUAL_JAVA_VERSION"

GREP_RESULT=$(echo $ACTUAL_JAVA_VERSION | grep -E "^(openjdk|java) version \"$EXPECTED_JAVA_VERSION")
if [ -z "$GREP_RESULT" ]; then
  echo "::error::Unexpected version"
  echo "Expected version: $EXPECTED_JAVA_VERSION"
  exit 1
fi

if [ -n "$SETUP_JAVA_VERSION" ]; then
  OUTPUT_JAVA_VERSION=$(echo "$SETUP_JAVA_VERSION" | cut -d'+' -f1)
  OUTPUT_GREP_RESULT=$(echo "$ACTUAL_JAVA_VERSION" | grep -E "^(openjdk|java) version \"$OUTPUT_JAVA_VERSION")
  if [ -z "$OUTPUT_GREP_RESULT" ]; then
    echo "::error::The version output does not match the installed Java version"
    echo "Version output: $SETUP_JAVA_VERSION"
    exit 1
  fi
  if [ "$REQUIRE_CONCRETE_VERSION" = "true" ] && [ "$OUTPUT_JAVA_VERSION" = "$EXPECTED_JAVA_VERSION" ]; then
    echo "::error::Expected a concrete version output for a floating JDK"
    echo "Version output: $SETUP_JAVA_VERSION"
    exit 1
  fi
fi

if [ "$EXPECTED_PATH" != "$JAVA_HOME" ]; then
  echo "::error::Unexpected path"
  echo "Actual path: $JAVA_HOME"
  echo "Expected path: $EXPECTED_PATH"
  exit 1
fi