#!/bin/bash -e

version=$("$(dirname "$0")/get-version.sh")

if [[ $version =~ ([0-9]+)\.([0-9]+)\.0 ]]; then
  major="${BASH_REMATCH[1]}"
  minor="${BASH_REMATCH[2]}"
else
  echo "unexpected version: $version"
  exit 1
fi

if [[ $minor == 0 ]]; then
  prior_major=$((major - 1))
  prior_minor=$(sed -n "s/^## Version $prior_major\.\([0-9]\+\)\..*/\1/p" CHANGELOG.md | head -1)
  if [[ -z $prior_minor ]]; then
    # assuming this is the first release
    range=
  else
    range="v$prior_major.$prior_minor.0..HEAD"
  fi
else
  range="v$major.$((minor - 1)).0..HEAD"
fi

declare -A component_names=()
component_names["aws-xray/"]="AWS X-Ray"
component_names["consistent-sampling/"]="Consistent sampling"
component_names["jfr-streaming/"]="JFR streaming"
component_names["jmx-metrics/"]="JMX metrics"
component_names["maven-extension/"]="Maven extension"
component_names["micrometer-meter-provider/"]="Micrometer MeterProvider"
component_names["runtime-attach/"]="Runtime attach"
component_names["samplers/"]="Samplers"
component_names["static-instrumenter/"]="Static instrumenter"

echo "## Unreleased"
echo

for component in */ ; do
  component_name=${component_names[$component]:=$component}
  echo "### $component_name"
  echo
  git log --reverse --pretty=format:"- %s" $range $component \
    | sed -r 's,\(#([0-9]+)\),\n  ([#\1](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/\1)),'
  echo
  echo
done