#!/usr/bin/env bash
# Reads the resolution order out of Spring's own bytecode instead of trusting the reference
# documentation's prose: which determine* helpers DefaultListableBeanFactory calls, in which order.
set -euo pipefail
cd "$(dirname "$0")/.."
mkdir -p output target/bytecode
JAR=$(find ~/.m2/repository/org/springframework/spring-beans -name 'spring-beans-*.jar' ! -name '*sources*' | sort | tail -1)
unzip -o -q "$JAR" 'org/springframework/beans/factory/support/DefaultListableBeanFactory*' -d target/bytecode
{
  echo "# DefaultListableBeanFactory.determineAutowireCandidate, read with javap"
  echo "# jar: $(basename "$JAR")"
  echo
  javap -p -c -cp target/bytecode org.springframework.beans.factory.support.DefaultListableBeanFactory 2>&1 \
    | grep -v 'Picked up' \
    | awk '/protected java.lang.String determineAutowireCandidate\(/{f=1} f{print} /^$/{if(f) exit}' \
    | grep -E 'determineAutowireCandidate|invoke|instanceof' | sed 's/^ *[0-9]*: //'
} > output/23-determine-autowire-candidate-bytecode.txt
cat output/23-determine-autowire-candidate-bytecode.txt

# --- the early-reference caches behind circular-reference support
JAR2=$(find ~/.m2/repository/org/springframework/spring-beans -name 'spring-beans-*.jar' ! -name '*sources*' | sort | tail -1)
unzip -o -q "$JAR2" 'org/springframework/beans/factory/support/DefaultSingletonBeanRegistry.class' -d target/bytecode
{
  echo "# DefaultSingletonBeanRegistry: the fields that hold early references, read with javap"
  echo "# jar: $(basename "$JAR2")"
  echo
  javap -p -cp target/bytecode org.springframework.beans.factory.support.DefaultSingletonBeanRegistry 2>&1 \
    | grep -v 'Picked up' | grep -E ' (singletonObjects|earlySingletonObjects|singletonFactories|singletonsCurrentlyInCreation|allowCircularReferences)[;]?' || true
  echo
  echo "# DefaultListableBeanFactory / AbstractAutowireCapableBeanFactory: the allow-circular-references switch"
  unzip -o -q "$JAR2" 'org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.class' -d target/bytecode
  javap -p -cp target/bytecode org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory 2>&1 \
    | grep -v 'Picked up' | grep -i 'allowCircularReferences' || true
} > output/24-early-reference-caches.txt
cat output/24-early-reference-caches.txt

# --- is the old Spring-specific @Nullable deprecated in 7.0.9?
JAR3=$(find ~/.m2/repository/org/springframework/spring-core -name 'spring-core-7*.jar' ! -name '*sources*' | sort | tail -1)
unzip -o -q "$JAR3" 'org/springframework/lang/Nullable.class' -d target/bytecode
{
  echo "# org.springframework.lang.Nullable in $(basename "$JAR3"), read with javap -v"
  echo
  javap -v -cp target/bytecode org.springframework.lang.Nullable 2>&1 | grep -v 'Picked up' | grep -E 'Deprecated|RuntimeVisibleAnnotations|Ljava/lang/Deprecated|forRemoval|since' || true
} > output/25-spring-nullable-deprecation.txt
cat output/25-spring-nullable-deprecation.txt

# --- does the Boot parent compile with -parameters?
PARENT=$(find ~/.m2/repository/org/springframework/boot/spring-boot-starter-parent -name '*.pom' | sort | tail -1)
{
  echo "# $(basename "$PARENT"): the compiler flag that parameter-name matching depends on"
  echo
  grep -n -B2 -A2 '<parameters>' "$PARENT" || echo "(no <parameters> element found)"
} > output/26-boot-parent-parameters-flag.txt
cat output/26-boot-parent-parameters-flag.txt