#!/usr/bin/env bash
# Builds all three modules and runs every example, writing real output to
# docs/output/<module>-<Class>.txt. The before/after pairs share a class name so
# the outputs can be diffed directly:
#
#   diff docs/output/before-S07DefaultsThatFlipped.txt \
#        docs/output/after-S07DefaultsThatFlipped.txt
set -u
cd "$(dirname "$0")"

mvn -B -q clean compile || { echo "compile failed"; exit 1; }
mkdir -p docs/output
FAILED=0

run_module() {
  local module="$1" prefix="$2" pkg="$3"
  local cp
  cp="$module/target/classes:$(cd "$module" && mvn -B -q dependency:build-classpath \
        -Dmdep.outputFile=/dev/stdout -DincludeScope=runtime 2>/dev/null | tail -1)"
  for f in $(find "$module/src/main/java" -name '*.java' | sort); do
    grep -q 'public static void main' "$f" || continue
    local short class
    short=$(basename "$f" .java)
    class="$pkg.$short"
    printf '%-14s %-32s' "$prefix" "$short"
    if java -cp "$cp" "$class" > "docs/output/$prefix-$short.txt" 2>&1; then
      echo "ok"
    else
      echo "FAILED"; FAILED=1
    fi
  done
}

run_module jackson2-before before      com.ankurm.migration.before
run_module jackson3-after  after       com.ankurm.migration.after
run_module coexistence     coexistence com.ankurm.migration.coexist

echo
echo "--- before/after diffs ---"
for after in docs/output/after-*.txt; do
  short=$(basename "$after" .txt); short=${short#after-}
  before="docs/output/before-$short.txt"
  [ -f "$before" ] || continue
  if diff -q "$before" "$after" >/dev/null; then
    echo "  $short: identical output"
  else
    echo "  $short: differs (expected — that is the migration surface)"
  fi
done

echo
if [ "$FAILED" -eq 0 ]; then echo "All examples ran successfully."; else echo "Some examples failed."; fi
exit $FAILED